FirstMerit (FMER) 10-K 25 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 21, 2014	Jun. 28, 2013
Entity Information [Line Items]	'	'	'
Entity Registrant Name	'FIRSTMERIT CORP /OH/	'	'
Entity Central Index Key	'0000354869	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	165,048,468	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$3,305,860,323.44

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from banks	$571,171	$244,223
Interest-bearing deposits in banks	346,651	13,791
Total cash and cash equivalents	917,822	258,014
Investment securities:	'	'
Held-to-maturity	2,935,688	622,121
Available-for-sale	3,273,174	2,920,971
Other investments	180,803	140,717
Loans held for sale	11,622	23,683
Loans	'	'
Loans	14,300,972	9,750,784
Allowance for loan losses	-141,252	-142,197
Net loans	14,159,720	9,608,587
Premises and equipment, net	327,054	181,149
Goodwill	739,819	460,044
Intangible assets	82,755	6,373
Covered other real estate	65,234	59,855
Accrued interest receivable and other assets	1,215,336	631,498
Total assets	23,909,027	14,913,012
Deposits:	'	'
Noninterest-bearing	5,459,029	3,338,371
Interest-bearing	3,026,735	1,287,674
Savings and money market accounts	8,587,167	5,758,123
Certificates and other time deposits	2,460,670	1,375,257
Total deposits	19,533,601	11,759,425
Federal funds purchased and securities sold under agreements to repurchase	851,535	1,104,525
Wholesale borrowings	200,600	136,883
Long-term debt	324,428	0
Accrued taxes, expenses and other liabilities	295,969	266,977
Total liabilities	21,206,133	13,267,810
Shareholders' equity:	'	'
5.875% Non-Cumulative Perpetual Preferred stock, Series A, without par value: authorized 115,000 shares; 100,000 issued	100,000	0
Common stock warrant	3,000	0
Common Stock, without par value; authorized 300,000,000 shares; issued: December 31, 2013 - 170,183,540 shares; December 31, 2012 - 115,121,731 shares	127,937	127,937
Capital surplus	1,390,643	475,979
Accumulated other comprehensive loss	-66,876	-16,205
Retained earnings	1,277,975	1,195,850
Treasury stock, at cost: December 31, 2013 - 5,127,332 shares; December 31, 2012 - 5,472,915 shares	-129,785	-138,359
Total shareholders' equity	2,702,894	1,645,202
Total liabilities and shareholders' equity	$23,909,027	$14,913,012

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]	'	'
Common Stock, Shares Authorized	300,000,000	300,000,000
Treasury Stock, Shares	5,127,332	5,472,915
Common Stock, Shares, Issued	170,183,540	115,121,731
Preferred Stock, Shares Authorized	7,000,000	'
Series A Non-Cumulative Perpetual Preferred Stock [Member]	'	'
Class of Stock [Line Items]	'	'
Preferred Stock, Shares Authorized	115,000	'
Preferred Stock, Shares Outstanding	100,000	'

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income:	'	'	'
Loans and loans held for sale	$635,872	$410,299	$438,393
Investment securities:	'	'	'
Taxable	108,824	85,030	87,044
Tax-exempt	21,107	15,354	12,819
Total investment securities interest	129,931	100,384	99,863
Total interest income	765,803	510,683	538,256
Interest expense:	'	'	'
Interest bearing	2,543	987	816
Savings and money market accounts	24,406	20,563	28,171
Certificates and other time deposits	9,649	11,723	20,003
Securities sold under agreements to repurchase	1,240	1,157	3,344
Wholesale borrowings	3,893	4,423	6,295
Long-term debt	13,287	0	0
Total interest expense	55,018	38,853	58,629
Net interest income	710,785	471,830	479,627
Provision for Loan, Lease, and Other Losses	33,684	54,698	74,388
Net interest income after provision for loan losses	677,101	417,132	405,239
Noninterest income:	'	'	'
Trust department income	34,770	23,143	22,396
Service charges on deposits	74,399	57,737	64,082
Credit card fees	50,542	43,569	49,539
ATM and other service fees	19,155	14,792	13,701
Bank owned life insurance income	16,926	12,140	14,820
Investment services and insurance	12,777	8,990	8,228
Investment securities gains/(losses), net	-2,803	3,786	11,081
Loan sales and servicing income	23,069	27,031	14,533
Other operating income	41,508	32,416	26,377
Total noninterest income	270,343	223,604	224,757
Noninterest expense:	'	'	'
Salaries, wages, pension and employee benefits	354,016	245,192	240,362
Net occupancy expense	49,510	31,754	32,414
Equipment expense	41,875	29,243	27,959
Stationery, supplies and postage	14,199	8,800	10,691
Bankcard, loan processing and other costs	71,929	34,195	32,226
Professional services	40,680	23,480	23,229
Amortization of intangibles	8,392	1,866	2,172
FDIC insurance expense	17,707	10,753	17,306
Other operating expense	89,026	68,330	77,986
Total noninterest expense	687,334	453,613	464,345
Income before income tax expense	260,110	187,123	165,651
Income tax expense	76,426	53,017	46,093
Net income	183,684	134,106	119,558
Less: Net income allocated to participating securities	1,545	0	0
Preferred Stock dividends	5,337	0	0
Net income attributable to common shareholders	$176,802	$134,106	$119,558
Basic earnings per common share	$1.18	$1.22	$1.10
Diluted earnings per common share	$1.18	$1.22	$1.10
Cash dividend per common share	$0.64	$0.64	$0.64
Weighted average number of common shares outstanding - basic	149,607	109,518	109,102
Weighted average number of common shares outstanding - diluted	150,421	109,518	109,102

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Preferred Stock	Common Stock	Warrant	Capital Surplus	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
In Thousands
Beginning Balance at Dec. 31, 2010	$1,507,715	$0	$127,937	$0	$485,567	($26,103)	$1,080,900	($160,586)
Net income	119,558	0	0	0	0	0	119,558	0
Other Comprehensive Income (Loss), Net of Tax	2,216	0	0	0	0	2,216	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	121,774	0	0	0	0	2,216	119,558	0
Cash dividends - common stock	-69,255	0	0	0	0	0	-69,255	0
Nonvested (restricted) shares granted	0	0	0	0	-14,222	0	0	14,222
Treasury Stock, Value, Acquired, Cost Method	2,295	0	0	0	602	0	0	2,897
Deferred compensation trust	0	0	0	0	-79	0	0	79
Recognition of stock compensation expense	8,014	0	0	0	8,014	0	0	'
Ending Balance at Dec. 31, 2011	1,565,953	0	127,937	0	479,882	-23,887	1,131,203	-149,182
Net income	134,106	0	0	0	0	0	134,106	0
Other Comprehensive Income (Loss), Net of Tax	7,682	0	0	0	0	7,682	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	141,788	0	0	0	0	7,682	134,106	0
Cash dividends - common stock	-69,459	0	0	0	0	0	-69,459	0
Nonvested (restricted) shares granted	49	0	0	0	-14,582	0	0	14,631
Treasury Stock, Value, Acquired, Cost Method	2,389	0	0	0	1,219	0	0	3,608
Deferred compensation trust	0	0	0	0	200	0	0	-200
Recognition of stock compensation expense	9,260	0	0	0	9,260	0	0	0
Ending Balance at Dec. 31, 2012	1,645,202	0	127,937	0	475,979	-16,205	1,195,850	-138,359
Net income	183,684	0	0	0	0	0	'	0
Other Comprehensive Income (Loss), Net of Tax	-50,671	0	0	0	0	-50,671	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	133,013	0	0	0	0	-50,671	183,684	0
Dividends, Preferred Stock, Cash	-5,337	0	0	0	0	0	-5,337	0
Cash dividends - common stock	-96,222	0	0	0	0	0	-96,222	0
Stock Issued During Period, Value, Acquisitions	925,272	0	0	0	925,272	0	0	0
Nonvested (restricted) shares granted	-6,813	0	0	0	-19,790	0	0	12,977
Treasury Stock, Value, Acquired, Cost Method	2,708	0	0	0	1,261	0	0	3,969
Deferred compensation trust	0	0	0	0	434	0	0	-434
Recognition of stock compensation expense	10,937	0	0	0	10,937	0	0	0
Issuance of common stock	96,550	100,000	0	0	-3,450	0	0	0
Adjustments to Additional Paid in Capital, Warrant Issued	3,000	0	0	3,000	0	0	0	0
Ending Balance at Dec. 31, 2013	$2,702,894	$100,000	$127,937	$3,000	$1,390,643	($66,876)	$1,277,975	($129,785)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity Paranthetical [Abstract]	'	'	'
Common Stock, Dividends, Per Share, Cash Paid	$0.64	$0.64	$0.64
Stock Issued During Period, Shares, Restricted Stock Award, Gross	563,257	596,415	587,113
Treasury Stock, Shares, Acquired	217,674	198,407	152,818
Stock Issued During Period, Shares, Treasury Stock Reissued	198,207	105,850	19,154
Stock Issued During Period, Shares, New Issues	55,468,283	0	0

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities	'	'	'
Net income	$183,684	$134,106	$119,558
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Provision for loan losses	33,684	54,698	74,388
Deferred income tax expense net of available for sale fair value tax adjustments	-17,819	4,679	-756
Depreciation, Depletion and Amortization	32,153	23,060	22,872
Benefit attributable to FDIC loss share	10,790	14,728	42,552
Accretion of acquired loans	-280,848	-80,506	-117,140
Accretion of income for lease financing	-3,566	-2,988	-2,556
Amortization and accretion of investment securities, net	'	'	'
Available for sale	17,274	15,343	15,127
Held to maturity	7,609	2,421	38
Losses (gains) on sales and calls of available-for-sale investment securities, net	2,803	-3,786	-11,081
Originations of loans held for sale	-550,193	-738,797	-526,719
Proceeds from sales of loans, primarily mortgage loans sold in the secondary markets	574,321	757,298	544,690
Gains on sales of loans, net	-12,067	-12,107	-6,708
Amortization of Intangible Assets	8,392	1,866	2,172
Recognition of stock compensation expense	10,937	9,260	8,014
Net decrease (increase) in other assets	181,772	88,530	-136,344
Net (decrease) increase in other liabilities	-25,570	-99,704	121,228
NET CASH PROVIDED BY OPERATING ACTIVITIES	173,356	168,101	149,335
Proceeds from sale of securities	'	'	'
Available for sale	2,179,728	418,124	968,478
Proceeds from Sale of Other Investments	89,554	0	20,253
Proceeds from Sale of Held-to-maturity Securities	897	0	0
Proceeds from prepayments, calls, and maturities	'	'	'
Available for sale	699,647	853,179	1,018,372
Held to maturity	245,259	54,775	37,326
Other	0	0	12
Purchases of securities	'	'	'
Available for sale	-1,059,130	-1,416,413	-2,267,953
Held to maturity	-1,832,993	-113,918	-60,115
Other	-3,098	-42	-278
Net decrease (increase) in loans and leases	307,939	-499,500	-51,457
Purchases of premises and equipment	-40,632	-13,073	-17,955
Sales of premises and equipment	1,110	1,813	0
Cash received for acquisition, net of cash paid	188,948	0	0
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	777,229	-715,055	-353,317
Financing Activities	'	'	'
Net increase in demand accounts	835,011	532,924	434,167
Net increase in savings and money market accounts	176,513	162,714	783,625
Net decrease in certificates and other time deposits	-514,103	-367,822	-1,054,189
Net (decrease) increase in securities sold under agreements to repurchase	-367,995	238,260	88,680
Proceeds from issuance of subordinated debt	249,930	0	0
Net decrease in wholesale borrowings	-655,603	-66,579	-122,545
Net proceeds from issuance of preferred stock	96,550	0	0
Cash dividends - common	-96,222	-69,459	-69,255
Cash dividends - preferred	-5,337	0	0
Restricted stock activity	-9,521	-2,389	-2,295
NET CASH (USED) PROVIDED BY FINANCING ACTIVITIES	-290,777	427,649	58,188
Increase (decrease) in cash and cash equivalents	659,808	-119,305	-145,794
Cash and cash equivalents at beginning of year	258,014	377,319	523,113
Cash and cash equivalents at end of year	917,822	258,014	377,319
Supplemental Non-Cash Information	'	'	'
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	925,211	'	'
Adjustments to Additional Paid in Capital, Warrant Issued	3,000	'	'
Cash paid during the year for:	'	'	'
Interest expense	50,055	40,252	61,275
Federal income taxes	$27,662	$45,321	$29,115

Statement_of_Comprehensive_Inc

Statement of Comprehensive Income Statement (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$183,684	$134,106	$119,558
Changes in unrealized securities' holding gains and (losses), net of taxes of $46.6 million, $2.2 million, and $10.2 million, respectively	-86,537	4,154	26,205
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	-1,822	2,461	7,203
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	-84,715	1,693	19,002
Cumulative net loss	31,161	-795	-21,744
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	-1	-52	256
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	2,884	6,836	4,702
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	34,044	5,989	-16,786
Other Comprehensive Income (Loss), Net of Tax	-50,671	7,682	2,216
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$133,013	$141,788	$121,774

Statement_of_Comprehensive_Inc1

Statement of Comprehensive Income Parenthetical (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$46,600	($2,200)	($10,200)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	-1,000	1,300	3,900
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	16,800	-400	-12,300
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Tax	0	0	-10
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	$1,600	$3,700	$2,500

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	The accounting and reporting policies of the Corporation conform to GAAP and to general practices within the financial services industry.
	In preparing these accompanying consolidated financial statements, subsequent events were evaluated through the time the consolidated financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users, or filed with the SEC.
	The following is a description of the Corporation's significant accounting policies.
	(a) Principles of Consolidation
	The Parent Company is a bank holding company whose principal asset is the common stock of its wholly-owned subsidiary, the Bank. The Parent Company’s other subsidiaries include Citizens Savings Corporation of Stark County, FirstMerit Capital Trust I, FirstMerit Risk Management, Inc., FMT, Inc, Citizens Funding Trust I and Citizens Michigan Statutory Trust I. All significant intercompany balances and transactions have been eliminated in consolidation.
	(b) Use of Estimates
	Management must make certain estimates and assumptions that affect the amounts reported in the financial statements and related notes. If these estimates prove to be inaccurate, actual results could differ from those reported.
	(c) Business Combinations
	Business combinations are accounted for using the acquisition method of accounting. Under this accounting method, the acquired company's net assets are recorded at fair value on the date of acquisition, and the results of operations of the acquired company are combined with the Corporation's results from that date forward. Costs related to the acquisition are expensed as incurred. The difference between the purchase price and the fair value of the net assets acquired (including intangible assets with finite lives) is recorded as goodwill. The accounting policy for goodwill and intangible assets is summarized in this note under the heading "Goodwill and Other Intangible Assets". As discussed in Note 2 (Business Combinations), the Corporation completed the merger with Citizens, a Michigan corporation, during 2013.
	(d) Variable Interest Entities
	In general, a VIE is an entity that either (1) has an insufficient amount of equity to carry out its principal activities without additional subordinated financial support, (2) has a group of equity owners that are unable to make significant decisions about its activities, or (3) has a group of equity owners that do not have the obligation to absorb losses or the right to receive returns generated by its operations. If any of these characteristics is present, the entity is subject to a variable interests consolidation model, and consolidation is based on variable interests, not on ownership of the entity's outstanding voting stock. Variable interests are defined as contractual, ownership, or other monetary interests in an entity that change with fluctuations in the entity's net asset value. The primary beneficiary is required to consolidate the VIE. The primary beneficiary is defined as the party that has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could be significant to the VIE.
	As a result of the merger with Citizens, the Corporation obtained variable interests in two active wholly owned trusts that were formed for the purpose of issuing securities. Each of the two active trusts issued separate offerings of trust preferred securities to investors in 2006 and 2003, with respect to which there remain $48.7 million and $25.7 million in aggregate liquidation amounts outstanding, respectively, as of December 31, 2013. The gross proceeds from the issuances were used to purchase junior subordinated deferrable interest debentures issued by Citizens, assumed by the Corporation. These junior subordinated deferrable interest debentures are the sole asset of each trust. The trust preferred securities held by these entities currently qualify as Tier 1 capital and are classified as long-term debt on the Consolidated Balance Sheet, with the associated interest expense recorded in long-term debt on the Consolidated Statement of Income. The expected losses and residual returns of these entities are absorbed by the trust preferred stock holders, and, therefore, these holders have a variable interest in the trusts. The Corporation is not exposed to loss because the investments in the trusts are not considered to be at risk, and consequently, the Corporation's investment in the trusts is not a variable interest, and the trusts are not consolidated in the Corporation's financial statements.
	(e) Cash and Cash Equivalents
	Cash and cash equivalents consist of cash and due from banks, interest bearing deposits in other banks and checks in the process of collection.
	(f) Investment Securities
	Debt securities are classified as held-to-maturity when the Corporation has the positive intent and ability to hold the securities to maturity. These securities are reported at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity using the effective yield method. This method produces a constant rate of return on the adjusted carrying amount.
	Securities are classified as available-for-sale when the Corporation intends to hold the securities for an indefinite period of time but may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. Securities available-for-sale are reported at fair value, with unrealized gains and losses, net of income tax, reported as a separate component of other comprehensive income (loss) in shareholders' equity.
	In certain situations, Management may elect to transfer certain debt securities from the available-for-sale to the held to maturity classification. In such cases, any unrealized gain or loss included in accumulated other comprehensive income (loss) at the time of transfer is amortized over the remaining life of the security as a yield adjustment such that only the remaining initial discount or premium from the purchase date is recognized in income.
	Interest and dividends on securities, including the amortization of premiums and accretion of discount, are included in interest income. Realized gains or losses on the sales of available-for-sale securities are recorded on the trade date and determined using the specific identification method.
	On at least a quarterly basis, Management evaluates securities that are in an unrealized loss position for OTTI. An investment security is deemed impaired if the fair value of the investment is less than its amortized cost. As part of the impairment evaluation, Management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in earnings and 2) OTTI related to other factors, such as liquidity conditions in the market or changes in market interest rates, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized in earnings.
	Other investments include FHLB and FRB stock. As a member of the FHLB system, the Bank is required to own a certain amount of stock based on the level of borrowings and other factors. The Bank is also a member of its regional FRB. Both FHLB and FRB stock are carried at cost and evaluated for impairment based on the ultimate recovery of par value. Cash and stock dividends received on the stock are reported as interest income in the Consolidated Statement of Income.
	(g) Loans and Loan Income
	Loans originated for investment are stated at their principal amount outstanding adjusted for partial charge-offs, the allowance for loan losses, and net deferred loan fees and costs. Interest income on loans is accrued over the term of the loans primarily using the simple-interest method based on the principal balance outstanding. Interest is not accrued on loans where collectability is uncertain. Accrued interest is presented separately in the balance sheet, except for accrued interest on credit card loans, which is included in the outstanding loan balance. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.
	(h) Loans Held for Sale
	Mortgage loans originated and intended for sale in the secondary market are carried at fair value. The election of the fair value option aligns the accounting for these loans with the related economic hedges. It also eliminates the requirements of hedge accounting under GAAP. Loan origination fees are recorded when earned and related direct loan origination costs are recognized when incurred. Upon their sale, differences between carrying value and sales proceeds realized are recorded to loan sales and servicing income in the Consolidated Statement of Income.
	A discussion of the valuation methodology applied to the Corporation's loans held for sale is described in Note 17 (Fair Value Measurement).
	(i) Nonperforming Loans
	Loans and leases on which payments are past due for 90 days are placed on nonaccrual, with the exception of certain commercial, credit card and mortgage loans and loans that are fully secured and in process of collection. Credit card loans on which payments are past due for 120 days are placed on nonaccrual status. Interest on mortgage loans is accrued until Management deems it uncollectible based upon the specific identification method.
	Loans are generally written off when deemed uncollectible or when they reach a predetermined number of days past due depending upon loan product, terms, and other factors. When a loan is placed on nonaccrual status, interest deemed uncollectible that had been accrued in prior years is charged against the allowance for loan losses and interest deemed uncollectible accrued in the current year is reversed against interest income. Payments subsequently received on nonaccrual loans are generally applied to principal. A loan is returned to accrual status when principal and interest are no longer past due and collectability is probable. This generally requires a sustained period of timely principal and interest payments.
	Under the Corporation's credit policies and practices, individually impaired loans include all nonaccrual and restructured commercial, agricultural, construction, and commercial real estate loans, but exclude certain aggregated consumer loans, mortgage loans, and leases classified as nonaccrual. Loan impairment for all loans is measured based on either the present value of expected future cash flows discounted at the loan's effective interest rate at inception, at the observable market price of the loan, or the fair value of the collateral for certain collateral dependent loans.
	Restructured loans are those on which concessions in terms have been made as a result of deterioration in a borrower's financial condition. In general, the modification or restructuring of a debt constitutes a troubled debt restructuring if the Corporation for economic or legal reasons related to the borrower's financial difficulties grants a concession to the borrower that the Corporation would not otherwise consider under current market conditions. Debt restructurings or loan modifications for a borrower do not necessarily constitute troubled debt restructurings. Troubled debt restructurings do not necessarily result in nonaccrual loans. Specific allowances for loan losses are established for certain consumer, commercial and commercial real estate loans whose terms have been modified in a TDR.
	Acquired nonimpaired loans are placed on nonaccrual and considered and reported as nonperforming or past due using the same criteria applied to the originated portfolio. Acquired impaired loans are not classified as nonperforming assets as the loans are considered to be performing under the provisions of ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality ("ASC 310-30"). Acquired loans restructured after acquisition are not considered TDRs for purposes of the Corporation's accounting and disclosure if the loans evidenced credit deterioration as of the acquisition date and are accounted for in pools.
	(j) Allowance for Loan Losses
	The allowance for loan losses is Management's estimate of the amount of probable credit losses inherent in the loan portfolio at the balance sheet date. Increases to the allowance for loan losses are made by charges to the provisions for loan losses. Loans deemed uncollectible are charged against the allowance for loan losses. Recoveries of previously charged-off amounts are credited to the allowance for loan losses. Management estimates credit losses based on individual loans determined to be impaired and on all other loans grouped based on similar risk characteristics.
	The Corporation's historical loss component is the most significant of the allowance for loan losses components and is based on historical loss experience by credit-risk grade (for commercial loan pools) and payment status (for mortgage and consumer loan pools). Loans are pooled based on similar risk characteristics supported by observable data. The historical loss experience component of the allowance for loan losses represents the results of migration analysis of historical net charge-offs for portfolios of loans (including groups of commercial loans within each credit-risk grade and groups of consumer loans by payment status). For measuring loss exposure in a pool of loans, the historical net charge-off or migration experience is utilized to estimate expected losses to be realized from the pool of loans.
	Individual commercial loans are assigned credit-risk grades based on an internal assessment of conditions that affect a borrower’s ability to meet its contractual obligation under the loan agreement. The assessment process includes reviewing a borrower’s current financial information, historical payment experience, credit documentation, public information, and other information specific to each individual borrower. Certain commercial loans are reviewed on an annual, quarterly or rotational basis or as Management becomes aware of information affecting a borrower’s ability to fulfill its obligation.
	The credit-risk grading process for commercial loans is summarized as follows:
	"Pass" Loans (Grades 1, 2, 3, 4) are not considered a greater than normal credit risk. Generally, the borrowers have the apparent ability to satisfy obligations to the bank, and the Corporation anticipates insignificant uncollectible amounts based on its individual loan review.
	"Special-Mention" Loans (Grade 5) are commercial loans that have identified potential weaknesses that deserve Management's close attention. If left uncorrected, these potential weaknesses may result in noticeable deterioration of the repayment prospects for the asset or in the institution's credit position.
	"Substandard" Loans (Grade 6) are inadequately protected by the current financial condition and paying capacity of the obligor or by any collateral pledged. Loans so classified have a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt pursuant to the contractual principal and interest terms. Such loans are characterized by the distinct possibility that the Corporation may sustain some loss if the deficiencies are not corrected.
	"Doubtful" Loans (Grade 7) have all the weaknesses inherent in those classified as substandard, with the added characteristic that existing facts, conditions, and values make collection or liquidation in full highly improbable. Such loans are currently managed separately to determine the highest recovery alternatives.
	If a nonperforming, substandard loan has an outstanding balance of $0.3 million or greater or if a doubtful loan has an outstanding balance of $0.1 million or greater, as determined by the Corporation's credit-risk grading process, further analysis is performed to determine the probable loss, if any, and assign a specific allowance to the loan if needed. The allowance for loan losses relating to originated loans that have become impaired is based on either expected cash flows discounted at the loan's original effective interest rate, the observable market price, or the fair value of the collateral for certain collateral dependent loans. To the extent credit deterioration occurs on purchased loans after the date of acquisition, the Corporation records an allowance for loan losses, net of any expected reimbursement under any FDIC Loss Sharing Agreements.
	Management also considers internal and external factors such as economic conditions, credit quality trends, loan management practices, portfolio monitoring, and other risks, collectively known as qualitative factors, or Q-factors, to estimate credit losses in the loan portfolio. Q-factors are used to reflect changes in the portfolio's collectability characteristics not captured by historical loss data.
	The Corporation also assesses the credit risk associated with off-balance sheet loan commitments and letters of credit. The liability for off-balance sheet credit exposure related to loan commitments and other credit guarantees is included in other liabilities on the Consolidated Balance Sheet.
	(k) Acquired Loans, Covered Loans and Related Loss Share Receivable
	Acquired loans (nonimpaired and impaired) are initially measured at fair value as of the acquisition date. The fair value estimates for acquired loans are based on the estimate of expected cash flows, both principal and interest and prepayments, discounted at prevailing market interest rates. Credit discounts representing the principal losses expected over the life of the loan are also a component of the initial fair value; therefore, an allowance for loan losses is not recorded at the acquisition date.
	The Corporation evaluates acquired loans for impairment in accordance with the provisions of ASC 310-30. Acquired loans are considered impaired if there is evidence of credit deterioration since origination and if it is probable at time of acquisition that all contractually required payments will not be collected. In determining the acquisition date fair value of acquired impaired loans, and in subsequent accounting, the Corporation generally aggregates impaired loans into pools of loans with common characteristics. Each pool is accounted for as a single asset with one composite interest rate and an aggregate expectation of cash flows. Expected cash flows at the acquisition date in excess of the fair value of the loans is referred to as the accretable yield and recorded as interest income over the life of the loans. Acquired impaired loans are not classified as nonaccrual or nonperforming as they are considered to be accruing loans because their interest income relates to the accretable yield recognized at the pool level and not to contractual interest payments at the loan level. Subsequent to the acquisition date, increases in expected cash flows will generally result in a recovery of any previously recorded ALLL, to the extent applicable, and/or a reclassification from the nonaccretable difference to accretable yield, which will be recognized prospectively. The present value of any decreases in expected cash flows after the acquisition date will generally result in an impairment charge recorded as a provision for loan losses, resulting in an increase to the ALLL, net of any expected reimbursement under FDIC Loss Share Agreements, to the extent applicable. Revolving loans, including lines of credit and credit cards loans, and leases are excluded from acquired impaired loan accounting.
	For acquired nonimpaired loans, the difference between the acquisition date fair value and the contractual amounts due at the acquisition date represents the fair value adjustment. Fair value adjustments may be discounts (or premiums) to a loan's cost basis and are accreted (or amortized) to interest income over the the loan's remaining life using the level yield method. Subsequent to the acquisition date, the methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans, however, the Corporation records a provision for loan losses only when the required allowance, net of any expected reimbursement under any FDIC Loss Share Agreements, to the extent applicable, exceeds the remaining fair value adjustment.
	Loans acquired in FDIC assisted transactions and covered under FDIC Loss Share Agreements are referred to as covered loans. Covered loans are recorded at fair value at the date of acquisition exclusive of the FDIC Loss Share Agreements. No allowance for loan losses related to covered loans is recorded on the acquisition date as the fair value of the loans acquired incorporates assumptions regarding credit risk.
	A loss share receivable is recorded at the acquisition date which represents the estimated fair value of reimbursement the Corporation expects to receive from the FDIC for incurred losses on certain covered loans. The fair value measurement reflects counterparty credit risk and other uncertainties. The loss share receivable continues to be measured on the same basis as the related indemnified loans. Deterioration in the credit quality of the loans (recorded as an adjustment to the allowance for covered loan losses) would immediately increase the basis of the loss share receivable, with the offset recorded through the consolidated statement of comprehensive income. Increases in the credit quality or cash flows of loans (reflected as an adjustment to yield and accreted into income over the remaining life of the loans) decrease the basis of the loss share receivable, with such decrease being accreted into income over 1) the same period or 2) the life of the loss share agreements, whichever is shorter. Loss assumptions used in the basis of the loss share receivable are consistent with the loss assumptions used to measure the related covered loans.
	Upon the determination of an incurred loss the loss share receivable will be reduced by the amount owed by the FDIC. A corresponding, claim receivable is recorded in accrued interest receivable and other assets on the Consolidated Balance Sheet until cash is received from the FDIC.
	An acquired or covered loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the period of resolution of a nonimpaired loan, any remaining unamortized fair value adjustment is recognized as interest income. In the period of resolution of an impaired loan accounted for on an individual basis, the difference between the carrying amount of the loan and the proceeds received is recognized as a gain or loss within noninterest income. The majority of impaired loans are accounted for within a pool of loans which results in any difference between the proceeds received and the loan carrying amount being deferred as part of the carrying amount of the pool. The accretable amount of the pool remains unaffected from the resolution until the subsequent quarterly cash flow re-estimation. Favorable results from removal of the resolved loan from the pool increase the future accretable yield of the pool, while unfavorable results are recorded as impairment in the quarter of the cash flow re-estimation. Acquired or covered impaired loans subject to modification are not removed from a pool even if those loans would otherwise be deemed TDRs as the pool, and not the individual loan, represents the unit of account.
	For further discussion of the Corporation's acquisitions and loan accounting, see Note 2 (Business Combinations), Note 4 (Loans), and Note 5 (Allowance for Loan and Lease Losses).
	(l) Equipment Lease Financing
	The Corporation leases equipment directly to customers. The net investment in financing leases includes the aggregate amount of lease payments to be received and the estimated residual values of the equipment, less unearned income. Income from lease financing is recognized over the lives of the leases on an approximate level rate of return on the unrecovered investment. The residual value represents the estimated fair value of the leased asset at the end of the lease term. Unguaranteed residual values of leased assets are reviewed at least annually for impairment. Declines in residual values determined to be other-than-temporary are recognized in earnings in the period such determinations are made.
	(m) Mortgage Servicing Rights
	The Corporation periodically sells residential real estate loans while retaining the rights and obligations to perform the servicing of such loans. Whenever the Corporation undertakes an obligation to service such loans, Management assesses whether a servicing asset or liability should be recognized. A servicing asset is recognized whenever the compensation for servicing is expected to exceed servicing costs. Likewise, a servicing liability would be recognized in the event that servicing fees to be received are not expected to adequately compensate the Corporation for its expected cost. Servicing assets associated with retained mortgage servicing rights are presented within other assets on the balance sheet. The Corporation does not presently have any servicing liabilities.
	MSRs are initially valued at fair value. Servicing assets and liabilities are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Amortization is recorded in loan sales and servicing income in the Consolidated Statement of Income.
	At each reporting period, MSRs are assessed for impairment based on fair value of those rights on a stratum-by-stratum basis. The Corporation stratifies its servicing rights portfolio into tranches based on loan type and interest rate, the predominant risk characteristics of the underlying loans. Any impairment is recognized through a valuation allowance for each impaired stratum through a charge to income. If the Corporation later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income.
	The Corporation also reviews MSRs for OTTI each quarter and recognizes a direct write-down when the recoverability of a recorded allowance for impairment is determined to be remote. Unlike an allowance for impairment, a direct write-down permanently reduces the unamortized cost of the MSR and the allowance for impairment.
	MSRs do not trade in an active open market with readily observable market prices. Although sales of MSRs do occur, the exact terms and conditions may not be available. As a result, the fair value of MSRs is estimated using discounted cash flow modeling techniques which require Management to make assumptions regarding future net servicing income, adjusted for such factors as net servicing income, discount rate and prepayments. The primary assumptions used in determining the current fair value of the Corporation's MSRs as well as a sensitivity analysis are presented in Note 7 (Mortgage Servicing Rights and Mortgage Servicing Activity).
	The Corporation generally records loan administration fees for servicing loans for investors on the accrual basis of accounting. Servicing fees and late fees related to delinquent loan payments are also recorded on the accrual basis of accounting.
(n) Depreciation and Amortization
For financial reporting purposes, premises and equipment, are reported at cost less accumulated depreciation and amortization and principally depreciated using the straight-line method over their estimated useful lives. Estimated useful lives for furniture and equipment range from three to 15 years, and depreciable buildings ranges from 10 to 35 years. Amortization of leasehold improvements is computed on the straight-line method based on related lease terms or the estimated useful lives of the assets of up to 15 years, whichever is shorter.
The Corporation purchases, as well as internally develops and customizes, certain software to enhance or perform internal business functions. Software development costs incurred in the planning and post-development project stages are charged to noninterest expense. Costs associated with designing software configuration and interfaces, installation, coding programs and testing systems are capitalized and amortized using the straight-line method over periods ranging from three to seven years.
(o) Goodwill and Other Intangible Assets
Goodwill represents the amount by which the cost of net assets acquired in a business combination exceeds their fair value. Other intangible assets represent the present value of the future stream of income to be derived from the purchase of core deposits. Other intangible assets are amortized on a straight-line basis over their estimated useful lives. Goodwill and other intangible assets deemed to have indefinite lives are not amortized.
Goodwill is evaluated for impairment on an annual basis at November 30th of each year or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The Corporation's reporting units for purposes of this testing are its major lines of business: Commercial, Retail, and Wealth. The goodwill impairment test is a two-step process that requires management to make judgments in determining what assumptions to use in the calculation. The first step in impairment testing is to estimate the fair value of each reporting unit based on valuation techniques including a discounted cash flow model with revenue and profit forecasts and comparing those estimated fair values with the carrying values, which includes the allocated goodwill. If the carrying amount of a reporting unit exceeds its fair value, goodwill impairment may be indicated and a second step is performed to compute the amount of the impairment by determining an "implied fair value" of goodwill. The determination of a reporting unit's implied fair value of goodwill requires the Corporation to allocate fair value of the reporting unit to the assets and liabilities of the reporting unit. Any unallocated fair value represents the "implied fair value" of goodwill, which is compared to its corresponding carrying value. An impairment loss would be recognized as a charge to earnings to the extent the carrying amount of the reporting unit's goodwill exceeds the implied fair value of goodwill.
(p) Other Real Estate Owned
Other real estate owned is included in other assets in the consolidated balance sheets and is primarily comprised of property acquired through loan foreclosure proceedings or acceptance of a deed-in-lieu of foreclosures, and loans classified as in-substance foreclosure. Other real estate owned is recorded at the lower of the recorded investment in the loan at the time of transfer or the fair value of the underlying property collateral, less estimated selling costs. Any write-down in the carrying value of a property at the time of acquisition is charged to the allowance for loan losses. Any subsequent write-downs to reflect current fair market value, as well as gains and losses on disposition and revenues and expenses incurred in maintaining such properties, are treated as period costs. Other real estate owned also includes bank premises formerly but no longer used for banking. Banking premises are transferred at the lower of carrying value or estimated fair value, less estimated selling costs.
(q) Derivative Instruments and Hedging Activities
The Corporation uses interest rate swaps, interest rate lock commitments and forward contracts sold to hedge interest rate risk for asset and liability management purposes. All derivatives are recorded as either other assets or other liabilities at fair value. Credit risk associated with derivatives is reflected in the fair values recorded for those positions. Accounting for changes in fair value (i.e., gains or losses) of derivatives differs depending on whether the derivative has been designated and qualifies as part of a hedging relationship, and further, on the type of hedging relationship. For derivatives that are not designated as hedging instruments, the gain or loss is recognized immediately in other operating income. A derivative that is designated and qualifies as a hedging instrument must be designated a fair value hedge, a cash flow hedge or a hedge of a net investment in a foreign operation. The Corporation does not have any cash flow hedges or derivatives that hedge net investments in foreign operations.
Effectiveness measures the extent to which changes in the fair value of a derivative instrument offset changes in the fair value of the hedged item. If the relationship between the change in the fair value of the derivative instrument and the fair value of the hedged item falls within a range considered to be the industry norm, the hedge is considered highly-effective and qualifies for hedge accounting. A hedge is ineffective if the offsetting difference between the fair values falls outside the acceptable range.
A fair value hedge is used to limit exposure to changes in the fair value of existing assets, liabilities and firm commitments caused by changes in interest rates or other economic factors. The Corporation recognizes the gain or loss on these derivatives, as well as the related gain or loss on the underlying hedged item, in earnings during the period in which the fair value changes. If a hedge is perfectly effective, the change in the fair value of the hedged item will be offset, resulting in no net effect on earnings.
A cash flow hedge is used to minimize the variability of future cash flows that is caused by changes in interest rates or other economic factors. The effective portion of a gain or loss on any cash flow hedge is reported as a component of accumulated other comprehensive income (loss) and reclassified into other operating income in the same period or periods that the hedged transaction affects earnings. Any ineffective portion of the derivative gain or loss is recognized in other operating income during the current period.
The Corporation enters into commitments to originate mortgage loans whereby the interest rate on the prospective loan is determined prior to funding (rate lock commitments). Rate lock commitments on mortgage loans that are intended to be sold are considered to be derivatives. Accordingly, such commitments, along with any related fees received from potential borrowers, are recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in net gain or loss on sale of mortgage loans.
(r) Income Taxes
Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between the carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized.
A tax position is recognized as a benefit only if it is "more likely than not" that the tax position would be sustained in a tax examination, with a tax being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the "more likely than not" test, no tax benefit is recorded.
The Corporation follows the asset and liability method of accounting for income taxes. Deferred income taxes are recognized for the tax consequences of "temporary differences" by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. The effect of a change in tax rates is recognized in income in the period of enactment date.
In assessing the realizability of deferred tax assets, Management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Assessing the need for, or the sufficiency of, a valuation allowance requires Management to evaluate all available evidence, both negative and positive, including the recent trend of quarterly earnings. Positive evidence necessary to overcome the negative evidence includes whether future taxable income in sufficient amounts and character within the carryback and carryforward periods is available under the tax law, including the use of tax planning strategies. When negative evidence (e.g., cumulative losses in recent years, history of operating loss or tax credit carryforwards expiring unused) exists, more positive evidence than negative evidence will be necessary.
Additional information regarding income taxes is included in Note 12 (Income Taxes).
(s) Treasury Stock
Treasury stock is accounted for using the cost method in which reacquired shares reduce outstanding Common Stock and capital surplus. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock on the last-in, first-out basis.
(t) Per Share Data
Basic net income per common share is calculated using the two-class method to determine income attributable to common shareholders. The two-class method is an earnings allocation formula that determines earnings per share for each share of common stock and participating securities according to dividends declared (distributed earnings) and participation rights in undistributed earnings. Distributed and undistributed earnings are allocated between common and participating security shareholders based on their respective rights to receive dividends. Unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities (i.e., nonvested restricted stock). Undistributed net losses are not allocated to nonvested restricted shareholders, as these shareholders do not have a contractual obligation to fund the losses incurred by the Corporation. Net income attributable to Common Stock are then divided by the weighted-average number of Common Stock outstanding during the period.
Diluted net income per common share is calculated under the more dilutive of either the treasury method or two-class method. For the diluted calculation, the weighted-average number of shares of Common Stock outstanding by the assumed conversion of outstanding convertible preferred stock from the beginning of the year or date of issuance, if later, and the number of shares of Common Stock that would be issued assuming the exercise of stock options and warrants using the treasury stock method. The treasury stock method assumes that the Corporation uses the proceeds from a hypothetical exercise of any options and warrants to repurchase Common Stock at the average market price during the period. These adjustments to the weighted-average number of shares of Common Stock outstanding are made only when such adjustments will dilute earnings per common share.
All earnings per share disclosures appearing in these financial statements, related notes and management's discussion and analysis, are computed assuming dilution unless otherwise indicated. The Corporation's earnings per share calculations are illustrated in Note 20 (Shareholders' Equity) under the heading "Earnings per Share."
(u) Trust Department Assets and Income
Property held by the Corporation in a fiduciary or other capacity for trust customers is not included in the accompanying consolidated financial statements, since such items are not assets of the Corporation. Trust department income is reported on the accrual basis of accounting.
(v) Share-Based Compensation
The Corporation's share-based compensation plans are described in detail in Note 14 (Share-Based Compensation). The Corporation recognizes share-based compensation expense using the straight-line method over the requisite service period for all stock awards, including those with graded vesting. The requisite service period is the period an employee is required to provide service in order to vest in the award, which cannot extend beyond the date at which the employee is no longer required to perform any service to receive the share-based compensation (the retirement-eligible date). Certain awards are contingent upon performance conditions, which affect the number of awards ultimately granted. The Corporation periodically evaluates the probable outcome of the performance conditions and makes cumulative adjustments to compensation expense as appropriate.
(w) Pension and Other Postretirement Plans
Pension and other postretirement costs are based on assumptions concerning future events that will affect the amount and timing of required benefit payments under the Corporation's plans. These assumptions include demographic assumptions such as retirement age and mortality, a compensation rate increase, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic benefit cost includes service and interest cost based on the assumed discount rate, an expected return on plan assets based on an actuarially derived market-related value and amortization of prior service cost and net actuarial gains or losses. The amortization of any prior service costs is determined using a straight line amortization of the cost over the average remaining lifetime of participants expected to receive benefits under the plans. Actuarial gains and losses include the impact of plan amendments and various unrecognized gains and losses which are deferred and amortized over the future service periods of active employees. The overfunded or underfunded status of the plans is recorded as an asset or liability, respectively, in the Consolidated Balance Sheet, with changes in that status recognized through other comprehensive income. Additional information about pension and other postretirement plans is included in Note 13 (Benefit Plans).
(x) Revenue Recognition
The Corporation recognizes revenues as they are earned based on contractual terms, as transactions occur, or as services are provided and collectability is reasonably assured. The Corporation's principal source of revenue is interest income, which is recognized on an accrual basis primarily according to nondiscretionary formulas in written contracts, such as loan agreements or securities contracts.
(y) Fair Value Measurement
Fair value is defined as the price to sell an asset or transfer a liability in an orderly transaction between market participants. It represents an exit price at the measurement date. Market participants are buyers and sellers, who are independent, knowledgeable, and willing and able to transact in the principal (or most advantageous) market for the asset or liability being measured. Current market conditions, including imbalances between supply and demand, are considered in determining fair value. The Corporation values its assets and liabilities in the principal market where it sells the particular asset or transfers the liability with the greatest volume and level of activity. In the absence of a principal market, the valuation is based on the most advantageous market for the asset or liability (i.e., the market where the asset could be sold or the liability transferred at a price that maximizes the amount to be received for the asset or minimizes the amount to be paid to transfer the liability).
In measuring the fair value of an asset, the Corporation assumes the highest and best use of the asset by a market participant to maximize the value of the asset, and does not consider the intended use of the asset.
When measuring the fair value of a liability, the Corporation assumes that the nonperformance risk associated with the liability is the same before and after the transfer. Nonperformance risk is the risk that an obligation will not be satisfied and encompasses not only the Corporation's own credit risk (i.e., the risk that the Corporation will fail to meet its obligation), but also other risks such as settlement risk. The Corporation considers the effect of its own credit risk on the fair value for any period in which fair value is measured.
There are three acceptable valuation techniques that can be used to measure fair value: the market approach, the income approach and the cost approach. Selection of the appropriate technique for valuing a particular asset or liability takes into consideration the exit market, the nature of the asset or liability being valued, and how a market participant would value the same asset or liability. Ultimately, determination of the appropriate valuation method requires significant judgment, and sufficient knowledge and expertise are required to apply the valuation techniques.
Valuation inputs refer to the assumptions market participants would use in pricing a given asset or liability using one of the three valuation techniques. Inputs can be observable or unobservable. Observable inputs are those assumptions which market participants would use in pricing the particular asset or liability. These inputs are based on market data and are obtained from a source independent of the Corporation. Unobservable inputs are assumptions based on the Corporation's own information or estimate of assumptions used by market participants in pricing the asset or liability. Unobservable inputs are based on the best and most current information available on the measurement date. All inputs, whether observable or unobservable, are ranked in accordance with a prescribed fair value hierarchy which gives the highest ranking to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest ranking to unobservable inputs (Level 3). Fair values for assets or liabilities classified as Level 2 are based on one or a combination of the following factors: (i) quoted prices for similar assets; (ii) observable inputs for the asset or liability, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Corporation considers an input to be significant if it drives 10% or more of the total fair value of a particular asset or liability.
Assets and liabilities are considered to be fair valued on a recurring basis if fair value is measured regularly (i.e., daily, weekly, monthly or quarterly). Recurring valuation occurs at a minimum on the measurement date. Assets and liabilities are considered to be fair valued on a nonrecurring basis if the fair value measurement of the instrument does not necessarily result in a change in the amount recorded on the balance sheet. Generally, nonrecurring valuation is the result of the application of other accounting pronouncements which require assets or liabilities to be assessed for impairment or recorded at the lower of cost or fair value. The fair value of assets or liabilities transferred in or out of Level 3 is measured on the transfer date, with any additional changes in fair value subsequent to the transfer considered to be realized or unrealized gains or losses. Additional information regarding fair value measurements is provided in Note 17 (Fair Value Measurement).
(z) Reclassifications
Certain reclassifications of prior years' amounts have been made to conform to current year presentation. Such reclassifications had no effect on prior year net income or shareholders' equity.
(aa) Recently Adopted and Issued Accounting Standards
The following section discusses new accounting policies that were adopted by the Corporation during 2013 and the expected impact of accounting standards recently issued but not yet required to be adopted. To the extent the adoption of new accounting standards materially affects financial condition, results of operations, or liquidity, the impacts are discussed in the applicable notes to the consolidated financial statements as referenced below.
FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 amends the guidance in ASC 310-40 by clarifying when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan. Additionally, the amendments require interim and annual disclosure of both 1) the amount of foreclosed residential real estate property held by the creditor and 2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in ASU 2014-04 are effective for annual periods, and interim period within those annual periods, beginning after December 15, 2014. The amendments can either be adopted using a modified retrospective or a prospective transition method. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.
FASB ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. Prior to this ASU, a reporting entity that invests in a qualified affordable housing project could elect to account for their investments using the effective yield method, if certain conditions were met, or for those investments that were not accounted for using the effective yield method, it was required that they be accounted for either using the equity or cost method. The amendments in ASU 2014-01 do not change the existing accounting methods, but permit reporting entities to make an accounting policy election to account for their investments in qualified affordable projects using the proportional amortization method, if certain conditions are met. The amendments in ASU 2014-01 are effective for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014, and should be applied retrospectively to all periods presented. The Corporation is in the process of analyzing its current accounting policy, but does not expect that a change to its current accounting policy will have a material impact on the Corporation's financial condition or results of operations.
FASB ASU 2013-11, Preparation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. Prior to this ASU, U.S. GAAP did not include explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This ASU requires, with limited exception, that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a DTA for a net operating loss carryforward, or similar tax loss, or a tax credit carryforward. The amendments in ASU 2013-11 are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, and should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Since the Corporation does not currently have unrecognized tax benefits, this ASU will not have an effect on the Corporation's financial position or results of operations.
FASB ASU 2013-10, Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes (a consensus of the Emerging Issues Task Force). The ASU permits the Fed Funds Effective Swap Rate (OIS) to be used as a benchmark interest rate for hedge accounting purposes, in addition to U.S. Treasury rates and LIBOR. The amendments also remove the restriction on using different benchmark rates for similar hedges. The ASU was effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The ASU has no impact on the Corporation's current hedging relationships and, thus, no impact on the Corporation's consolidated financial statements.
FASB ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 amends the guidance on ASC 220-10 by requiring an entity to provide information about the amounts reclassified out of AOCI by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. The Corporation adopted this ASU effective January 1, 2013 and has incorporated this new disclosure information into Note 21 (Changes and Reclassifications Out of Accumulated Other Comprehensive Income).
FASB ASU 2012-06, Business Combinations: Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution (a consensus of the FASB Emerging Issues Task Force). ASU 2012-06 amends the guidance in ASU 805-20 on the recognition of an indemnification asset as a result of a government-assisted acquisition of a financial institution when a subsequent change in the cash flows expected to be collected on the indemnification asset occurs (as a result of a change in cash flows expected to be collected on the assets subject to indemnification). A subsequent change in the measurement of the indemnification asset is to be accounted for on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value are limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The Corporation adopted this ASU effective January 1, 2013, and the adoption did not have a significant impact on the Corporation's consolidated financial statements.
FASB ASU 2011-11, Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 amends the guidance in ASC 210, Balance Sheet, to require an entity to disclose information about offsetting and related arrangements to enable users of an entity's financial statements to evaluate the effect or potential effect of netting arrangements. In January 2013, the FASB issued ASU 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities, which more narrowly defined the scope of financial instruments to only derivatives, repurchase and reverse purchase agreements, and securities borrowing and lending transactions. The Corporation adopted these ASUs as of January 1, 2013, and the adoption did not have a significant impact on the Corporation's consolidated financial statements. The newly required disclosures are incorporated into Note 18 (Derivatives and Hedging Activity).

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Combination Disclosure	'
	Business Combinations
	The Corporation completed the merger with Citizens, a Michigan corporation with approximately $9.6 billion in assets and 219 branches, in the quarter ended June 30, 2013. All of Citizens' common shareholders received 1.37 shares of the Corporation's Common Stock in exchange for one share of Citizens' common stock, resulting in the Corporation issuing 55,468,283 shares of its Common Stock. In conjunction with the completion of the merger, the Corporation fully repurchased the $300 million of Citizens TARP Preferred plus accumulated but unpaid dividends and interest of approximately $55.4 million previously issued to the U.S. Treasury under the Capital Purchase Program. The Corporation used the net proceeds from its February 4, 2013 public offerings, which consisted of $250 million aggregate principal amount of 4.35% subordinated notes due February 4, 2023, and $100 million 5.875% Non-Cumulative Perpetual Preferred Stock, Series A, to repurchase the Citizens TARP Preferred and pay all accrued, accumulated and unpaid dividends and interest. Additionally, a warrant issued by Citizens to the U.S. Treasury to purchase up to 1,757,812.5 shares of Citizens' common stock has been converted into a warrant issued by the Corporation to the U.S. Treasury to purchase 2,408,203 shares of FirstMerit Common Stock.
	The Citizens transaction was accounted for using the acquisition method of accounting and, as such, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the Acquisition Date. All acquired loans were also recorded at fair value. No allowance for loan losses was carried over and no allowance was created at Acquisition Date. Per the acquisition method of accounting, these fair values are preliminary and subject to refinement for up to one year after the Acquisition Date as additional information relative to closing date fair values become available.
	The following table provides the preliminary purchase price calculation as of the Acquisition Date and the identifiable assets purchased and the liabilities assumed at their estimated fair value. These fair value measurements are provisional based on third-party valuations that are currently under review.
	Purchase Price:
	FirstMerit shares of Common Stock issued for Citizens' shares					55,468,283
	Closing price per share of the Corporation's Common Stock on April 12, 2013					$	16.68
	Consideration from Common Stock conversion (1.37 ratio)					925,211
	Cash paid to the Treasury for Citizens' TARP Preferred					355,371
	Cash paid in lieu of fractional shares to the former Citizens' shareholders					61
	Consideration from the warrant issued to the Treasury for Citizens' TARP warrant					3,000
	Total purchase price					$	1,283,643
	Preliminary Statement of Net Assets Acquired at Fair Value:
	ASSETS
	Cash and due from banks		$	544,380
	Investment Securities		3,202,575
	Loans		4,617,004
	Premises and equipment		138,536
	Intangible assets		84,774		1
	Accrued interest receivable and other assets		680,020
	Total assets		$	9,267,289
	LIABILITIES
	Deposits		$	7,276,754
	Borrowings		908,824
	Accrued taxes, expenses, and other liabilities		77,843
	Total liabilities		$	8,263,421
	Net identifiable assets acquired					1,003,868
	Goodwill					$	279,775
	1 - Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful lives for which the core deposit intangible and the trust relationships are being amortized over are 15 years and 12 years, respectively.
	The estimated fair values presented in the above table reflect additional information that the Corporation obtained during the year ended December 31, 2013, which resulted in changes to certain fair value estimates made as of the Acquisition Date. Material adjustments to acquisition date estimated fair values are recorded in the period in which the acquisition occurred and, as a result, previously recorded results have changed. After considering this additional information, the estimated fair value of loans decreased $7.3 million, the estimated fair value of premises and equipment decreased $0.2 million, the estimated fair value of other assets increased $1.1 million and the estimated fair value of other liabilities decreased $1.0 million as of the Acquisition Date from that originally reported as of June 30, 2013. The estimated net deferred tax asset increased $3.4 million as a result of these revised fair values. These revised fair value estimates resulted in a net increase to goodwill of $5.4 million to $279.8 million, which is recognized in the Consolidated Balance Sheet as of December 31, 2013.
	The amount of goodwill recorded reflects the increased market share and related synergies that are expected to result from the acquisition, and represents the excess purchase price over the estimated fair value of the net assets acquired. None of the goodwill is deductible for income tax purposes as the merger is accounted for as a tax-free exchange. The tax-free exchange resulted in a carryover of tax attributes and tax basis to the Corporation's subsequent income tax filings. These carryovers were comprised of DTA of $313.0 million and DTL of $51.3 million for a net DTA carryover of $261.7 million. This net DTA includes $224.8 million of net operating loss and tax credit carryovers. The carryover of these tax attributes is subject to limitation as to the tax period in which they can be used to reduce future tax payments. The amounts recorded are expected to be substantially used by 2016, however, some will continue to carryover until 2032. These tax attribute benefits will also be subject to regulatory capital adjustments until fully utilized. An additional net DTA of $86.5 million was established on the Acquisition Date as a result of the purchase accounting fair value adjustments resulting in a total net DTA on the Acquisition Date of $348.2 million.
	The following table summarizes the provisional fair value of both acquired impaired and nonimpaired loans by product type as of the Acquisition Date.
		Acquired Impaired Loans			Acquired Nonimpaired Loans			Acquired Loans Total
	Commercial
	C&I	$	93,735		$	1,660,199		$	1,753,934
	CRE	378,569			359,066			737,635
	Construction	13,399			17,135			30,534
	Total commercial	485,703			2,036,400			2,522,103
	Consumer
	Residential mortgages	232,291			278,404			510,695
	Installment	54,108			1,165,235			1,219,343
	Home equity lines	47,613			317,250			364,863
	Total consumer	334,012			1,760,889			2,094,901
	Total	$	819,715		$	3,797,289		$	4,617,004
	The determination of estimated fair values of the acquired loans required the Corporation to make certain estimates about discount rates, future expected cash flows, market conditions and other future events that are highly subjective in nature. Based on such factors as past due status, nonaccrual status and credit risk ratings, the acquired loans were divided into loans with evidence of credit quality deterioration, which are accounted for under ASC 310-30 (acquired impaired), and loans that do not meet this criteria, which are accounted for under ASC 310-20 (acquired nonimpaired). The acquired loans were further segregated into loan pools designed to facilitate the development of expected cash flows to be used in estimating fair value. Acquired loans were segregated into pools based on characteristics such as loan type, credit risk profiles, contractual interest rate and repayment terms and market area in which originated. Expected cash flows, both principal and interest, were estimated based on key assumptions covering such factors as prepayments, default rates and severity of loss given default. These assumptions were developed using both Citizens' historical experience and the portfolio characteristics at Acquisition Date as well as available market research. The fair value estimates for acquired loans was based on the amount and timing of expected principal, interest and other cash flows, included expected prepayments, discounted at prevailing market interest rates.
	For acquired nonimpaired loans, the difference between the Acquisition Date fair value and the contractual amounts due at the Acquisition Date represents the fair value adjustment. Fair value adjustments may be discounts (or premiums) to a loan's cost basis and are accreted (or amortized) to interest income over the the loan's remaining life using the level yield method. Acquired nonimpaired loans are reported net of the unamortized fair value adjustment in the Consolidated Balance Sheet. The fair value adjustment for acquired nonimpaired loans as of the Acquisition Date is presented in the following table.
		Acquired Nonimpaired Loans
	Outstanding balance	$	4,017,304
	Less: Fair value adjustment	220,015
	Fair value of acquired nonimpaired loans	$	3,797,289
	The table below details contractually required payments, cash flows not expected to be collected and cash flows expected to be collected on acquired nonimpaired loans as of the Acquisition Date.
		Acquired Nonimpaired Loans
	Contractually required payments including interest (a)	$	4,955,180
	Less: Contractual cash flows not expected to be collected	680,664
	Cash flows expected to be collected	$	4,274,516
	(a) - Total undiscounted amounts of all uncollected contractual principal and interest, including any fees and penalties, both past due and scheduled for the future, assuming no loss or prepayment.
	For acquired impaired loans, the excess of cash flows expected over the estimated fair value at the Acquisition Date represents the accretable yield and is recognized as interest income using a level yield method over the remaining life of the pooled impaired loans. Each pool of acquired impaired loans is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows. Acquired impaired loans in pools with an accretable yield are considered to be accruing and performing even though collection of contractual payments on loans within the pool may be in doubt, because the pool is the unit of accounting and income continues to be accreted on the pool as long as expected cash flows are reasonably estimable.
	Total outstanding acquired impaired loans as of the Acquisition Date were $1.1 billion. A reconciliation of the contractual required payments to the fair value of the acquired impaired loans at the Acquisition Date is as follows:
		Acquired Impaired Loans
	Contractually required payments including interest (a)	$	1,231,172
	Nonaccretable difference (b)	(279,899		)
	Cash flows expected to be collected (c)	951,273
	Accretable yield (d)	(131,558		)
Fair value of loans acquired	$	819,715
(a) - Total undiscounted amounts of all uncollected contractual principal and interest, including any fees and penalties, both past due and scheduled for the future, assuming no loss or prepayment.
(b) - The nonaccretable difference represents, as of the Acquisition Date, the amount of contractually required payments, including interest, that are not expected to be collected based on estimated credit losses and other factors, such as prepayments.
(c) - Represents the estimate, at Acquisition Date, of the amount and timing of undiscounted principal, interest, and other cash flows expected to be collected. This estimate includes the effect of anticipated prepayments.
(d) - The accretable yield represents the excess of cash flows expected at Acquisition Date over the estimated fair value and is recognized as interest income over the remaining life of the loan using the level yield method.
The fair value of the investment securities acquired was approximately $3.2 billion. Management's strategy to reduce prepayment and credit risk of the acquired investment securities portfolio resulted in the sale of approximately $2.2 billion in agency MBS, agency CMO, municipal securities and private label MBS investments subsequent to the close of the acquisition. During the second quarter of 2013, Management repurchased approximately $1.5 billion of agency MBS and CMO securities in accordance with the Corporation's investment polices.
As part of the merger, the Corporation assumed Citizens' FHLB advances with a fair value of $719.3 million. On April 15, 2013, in conjunction with Management's strategy to de-leverage the acquired Citizens' balance sheet, the Corporation terminated all but two assumed FHLB advances resulting in cash outlay of $652.5 million, which approximated the fair value. The fair value of the two retained FHLB advances totaled $66.8 million and mature on May 16, 2016. FHLB advances are reflected in the line item "Federal funds purchased and securities sold under agreements to repurchase" on the Consolidated Balance Sheet.
The Corporation also assumed obligations under junior subordinated debentures at fair value in the amount of $74.5 million, payable to two unconsolidated trusts that issued trust preferred securities. The junior subordinated debentures are the sole assets of each trust. The variable interest rate junior subordinated debenture has a maturity date of June 26, 2033 and bears interest at an annual rate equal to the three-month LIBOR plus 3.10% and adjusts on a quarterly basis not to exceed 11.75%. The junior subordinated debenture is an unsecured obligation of the Corporation and is junior in right of payment to all future senior indebtedness of the Corporation. The Corporation has guaranteed that interest payments on the junior subordinated debenture made to the trust will be distributed by the trust to the holders of the trust preferred securities. The trust preferred securities of the special purpose trust are callable at par and must be redeemed in thirty years after issuance. Under the risk-based capital guidelines, the trust preferred securities currently qualify as Tier 1 capital, however, a final rule on Basel III, which becomes effective in January 2014, phases out trust preferred securities from qualifying as Tier 1 Capital beginning January 1, 2015 with complete elimination by January 1, 2016. The fixed 7.50% interest rate junior subordinated debenture has a maturity date of September 15, 2066 and is listed on the NYSE (NYSE symbol CTZ-PA). Interest is payable quarterly in arrears and became callable on September 15, 2011.
The Corporation also assumed long-term repurchase agreements with a fair value amount of $115.0 million. On April 15, 2013, in conjunction with Management's strategy to de-leverage the newly acquired Citizens' balance sheet, all of these these long-term repurchase agreements were terminated.
The operating results of the Corporation for the year ended December 31, 2013 include the operating results of the acquired assets and assumed liabilities subsequent to the Acquisition Date. The operations of the Wisconsin and Michigan geographic area, which primarily includes the acquired operations of Citizens, provided approximately $222.7 million in interest income, and approximately $106.4 million in net income for the period from the Acquisition Date to December 31, 2013. These amounts are included in the Corporation's consolidated financial statements for the year ended December 31, 2013. Citizens' results of operations prior to the Acquisition Date are not included in the Corporation's Consolidated Statement of Income.
Merger-related charges of $75.1 million were recorded in the Consolidated Statement of Income for the year ended December 31, 2013. These costs were primarily composed of severance and retention employee benefits of $21.6 million, professional services of $20.2 million and $23.6 million in fees for early termination of existing agreements assumed from the merger (reported within bankcard, loan processing and other costs in the accompanying Consolidated Statement of Income). Core operating systems were converted as of October 20, 2013.
The following table provides the unaudited pro forma information for the results of operations for the years ended December 31, 2013 and 2012, as if the acquisition had occurred January 1 of each year. These adjustments include the impact of certain purchase accounting adjustments including accretion of loan marks, which makes up the vast majority of the adjustments, followed by intangible assets amortization, investment securities amortization, fixed assets depreciation and deposit accretion. In addition, the $75.1 million in year to date merger-related expenses previously discussed are included in each period presented. The Corporation expects to achieve further operating cost savings and other business synergies as a result of the acquisition which are not reflected in the pro forma amounts. These unaudited pro forma results are presented for illustrative purposes and are not intended to represent or be indicative of the actual results of operations of the combined corporation that would have been achieved had the acquisition occurred at the beginning of each period presented, nor are they intended to represent or be indicative of future results of operations.
		(Unaudited)
		Year Ended December 31,
		2013			2012
Total revenue, net of interest expense		$	1,096,960		$	1,254,594
Net income		196,744			609,259
Note: 2012 net income includes approximately $276.8 million of tax benefits as a result of Citizens reversal of its valuation allowance on its DTA.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure	'
	Investment Securities
	The following tables provide the amortized cost and fair value for the major categories of held-to-maturity and available-for-sale securities. Held-to-maturity securities are carried at amortized cost, which reflects historical cost, adjusted for amortization of premiums and accretion of discounts. Available-for-sale securities are carried at fair value with net unrealized gains or losses reported on an after-tax basis as a component of other comprehensive income in shareholders' equity.
			December 31, 2013
			Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	258,787			$	7,376			$	(3,796	)		$	262,367
		Residential mortgage-backed securities:
		U.S. government agencies	962,687				21,662				(14,427		)		969,922
		Commercial mortgage-backed securities:
		U.S. government agencies	72,048				7				(2,488		)		69,567
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,566,262				4,199				(52,068		)		1,518,393
		Nonagency	9				—				—				9
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	104,152				273				(2,157		)		102,268
		Asset-backed securities:
		Collateralized loan obligations	297,259				760				(4,332		)		293,687
		Corporate debt securities	61,596				—				(10,952		)		50,644
		Total debt securities	3,322,800				34,277				(90,220		)		3,266,857
	Equity Securities
		Marketable equity securities	3,036				—				—				3,036
		Nonmarketable equity securities	3,281				—				—				3,281
		Total equity securities	6,317				—				—				6,317
		Total securities available for sale	$	3,329,117			$	34,277			$	(90,220	)		$	3,273,174
	Securities held-to-maturity
	Debt securities
		U.S. treasuries	$	5,000			$	4			$	—			$	5,004
		U.S. government agency debentures	25,000				—				(1,348		)		23,652
		U.S. states and political subdivisions	480,703				5,335				(10,459		)		475,579
		Residential mortgage-backed securities:
		U.S. government agencies	569,960				1,108				(11,617		)		559,451
		Commercial mortgage-backed securities:
		U.S. government agencies	56,596				—				(1,190		)		55,406
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,464,732				—				(81,818		)		1,382,914
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	240,069				6				(11,052		)		229,023
		Corporate debt securities	93,628				308				(725		)		93,211
		Total securities held to maturity	$	2,935,688			$	6,761			$	(118,209	)		$	2,824,240
			December 31, 2012
			Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	253,198			$	15,235			$	(229	)		$	268,204
		Residential mortgage-backed securities:
		U.S. government agencies	1,058,005				49,058				—				1,107,063
		Commercial mortgage-backed securities:
		U.S. government agencies	52,014				428				(406		)		52,036
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,311,501				18,180				(260		)		1,329,421
		Nonagency	11				—				—				11
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	109,260				2,221				(138		)		111,343
		Corporate debt securities	61,541				—				(11,889		)		49,652
		Total debt securities	2,845,530				85,122				(12,922		)		2,917,730
		Marketable equity securities	3,241				—				—				3,241
		Total securities available for sale	$	2,848,771			$	85,122			$	(12,922	)		$	2,920,971
	Securities held-to-maturity
	Debt securities
		U.S. states and political subdivisions	$	270,005			$	5,126			$	(70	)		$	275,061
	Commercial mortgage-backed securities:													—
	U.S. government agencies	33,165				812				—				33,977
	Residential collateralized mortgage-backed securities:													—
	U.S. government agencies	123,563				533				(16		)		124,080
	Commercial collateralized mortgage-backed securities:													—
	U.S. government agencies	98,924				772				—				99,696
	Corporate debt securities	96,464				1,521				—				97,985
	Total securities held to maturity	$	622,121			$	8,764			$	(86	)		$	630,799
The Corporation's U.S. states and political subdivisions portfolio is composed of general obligation bonds issued by a highly diversified number of states, cities, counties, and school districts. Additionally, the aggregate fair value of the Corporation's general obligation bonds was greater than $10 million in 12 of the 38 U.S. states in which it holds investments. The amortized cost and fair value of the Corporation's portfolio of general obligation bonds are summarized by U.S. state in the tables below.
	December 31, 2013
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Ohio	154			1,041				159,674				160,265
Michigan	166			744				122,198				123,571
Illinois	75			1,314				96,863				98,521
Texas	69			771				54,295				53,204
Wisconsin	87			645				54,921				56,152
Pennsylvania	51			891				48,319				45,451
Minnesota	45			663				29,840				29,816
Washington	30			930				28,393				27,906
New Jersey	38			722				27,101				27,440
Missouri	20			969				19,253				19,382
New York	22			585				13,064				12,878
California	18			599				10,651				10,788
Other	115			631				74,918				72,572
Total general obligation bonds	890			$	829			$	739,490			$	737,946
	December 31, 2012
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Ohio	127			$	1,167			$	144,789			$	148,264
Illinois	42			1,366				55,207				57,365
Pennsylvania	55			970				51,932				53,348
Texas	53			931				47,613				49,326
Wisconsin	28			1,096				28,572				30,687
Minnesota	40			719				27,348				28,756
New Jersey	33			856				26,541				28,232
Michigan	22			1,233				26,104				27,130
Washington	22			907				18,976				19,958
Missouri	10			1,482				13,809				14,815
New York	18			639				11,027				11,507
California	11			930				9,734				10,231
Other	85			742				61,551				63,646
Total general obligation bonds	546			$	994			$	523,203			$	543,265
The Corporation owns one revenue bond with an estimated fair value of $0.6 million and an amortized cost of $0.5 million as of December 31, 2013. This bond was purchased in 1999, prior to the Corporation adopting an internal investment policy prohibiting purchases of revenue bonds. The revenue bond's maturity has been pre-refunded with U.S. treasuries. Pre-refunded municipal bonds are those that are backed by an escrow account and invested in U.S. Treasuries which is used to pay bondholders at maturity. Thus the revenue bond carries the credit risk of the U.S. Treasury.
The Corporation's investment policy states that municipal securities purchased are to be investment grade and allows for a 20% maximum portfolio concentration in municipal securities with a combined individual state to total municipal outstanding equal to or less than 25%. A municipal security is investment grade if (1) the security has a low risk of default by the obligor and (2) the full and timely payment of principal and interest is expected over the anticipated life of the instrument. The fact that a municipal security is rated by one nationally recognized credit rating agency is indicative, but not sufficient evidence, that a municipal security is investment grade. In all cases, the Corporation considers and documents within a security pre-purchase analysis factors such as capacity to pay, market and economic data, and such other factors as are available and relevant to the security or issuer. Factors to be considered in the ongoing monitoring of municipal securities and in the pre-purchase analysis include soundness of budgetary position, and sources, strength, and stability of tax or enterprise revenues. The Corporation also considers spreads to U.S. Treasuries on comparable bonds of similar credit quality, in addition to the above analysis, to assess whether municipal securities are investment grade. The Corporation performs a risk analysis for any security that is downgraded below investment grade to determine if the security should be retained or sold. This risk analysis includes, but is not limited to, discussions with the Corporation's credit department as well as third party municipal credit analysts and review of the nationally recognized credit rating agency's analysis describing the downgrade.
The Corporation's evaluation of its municipal bond portfolio at December 31, 2013 did not uncover any facts or circumstances resulting in significantly different credit ratings than those assigned by a nationally recognized credit rating agency.
FRB and FHLB stock constitute the majority of other investments on the Consolidated Balance Sheet.
	December 31,
	2013				2012
FRB stock	$	55,294			$	21,045
FHLB stock	125,032				119,145
Other	477				527
Total other investments	$	180,803			$	140,717
FRB and FHLB stock is classified as a restricted investment, carried at cost and valued based on the ultimate recoverability of par value. Cash and stock dividends received on the stock are reported as interest income. There are no identified events or changes in circumstances that may have a significant adverse effect on these investments carried at cost.
Securities with a carrying value of $3.2 billion and $1.6 billion at December 31, 2013 and 2012, respectively, were pledged to secure trust and public deposits and securities sold under agreements to repurchase and for other purposes required or permitted by law.
Realized Gains and Losses
The following table presents the proceeds from sales of available-for-sale securities and the gross realized gains and losses on the sales of those securities that have been included in earnings as a result of those sales. Gains or losses on the sales of available-for-sale securities are recognized upon sale and are determined using the specific identification method.
	Years Ended December 31,
	2013				2012				2011
Realized gains	$	3,786			$	3,786			$	11,251
Realized losses	(6,589		)		—				(170		)
Net securities (losses)/gains	$	(2,803	)		$	3,786			$	11,081
Gross Unrealized Losses and Fair Value
The following table presents the gross unrealized losses and fair value of securities in the securities available-for-sale portfolio by length of time that individual securities in each category had been in a continuous loss position.
		December 31, 2013
		Less than 12 months											12 months or longer							Total
		Fair Value				Unrealized				Number			Fair Value			Unrealized			Number	Fair Value		Unrealized
						Losses				Impaired						Losses			Impaired			Losses
										Securities									Securities
Securities available-for-sale
	Debt Securities
	U.S. states and political subdivisions	$	38,039			$	(1,996	)		65			$	14,157		$	(1,800	)	25	$	52,196	$	(3,796	)
	Residential mortgage-backed securities:
	U.S. government agencies	434,761				(13,109		)		35			14,890			(1,318		)	2	449,651		(14,427		)
	Commercial mortgage-backed securities:
	U.S. government agencies	33,387				(1,491		)		5			16,944			(997		)	2	50,331		(2,488		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,135,151				(44,775		)		74			100,530			(7,293		)	7	1,235,681		(52,068		)
	Nonagency	—				—				—			1			—			1	1		—
	Commercial collateralized mortgage-backed securities:
	U.S. Government agencies	43,747				(2,055		)		6			2,525			(102		)	1	46,272		(2,157		)
	Collateralized loan obligations:
	Nonagency	223,458				(4,332		)		33			—			—			—	223,458		(4,332		)
	Corporate debt securities	—				—				—			50,644			(10,952		)	8	50,644		(10,952		)
	Total available-for-sale securities	$	1,908,543			$	(67,758	)		218			$	199,691		$	(22,462	)	46	$	2,108,234	$	(90,220	)
Securities held-to-maturity
	Debt Securities
	U.S. government agency debentures	$	23,652			$	(1,348	)		1			$	—		$	—		—	$	23,652	$	(1,348	)
	U.S. states and political subdivisions	222,154				(10,276		)		353			2,478			(183		)	6	224,632		(10,459		)
	Residential mortgage-backed securities:
	U.S. government agencies	422,192				(11,617		)		22			—			—			—	422,192		(11,617		)
	Commercial mortgage-backed securities:
	U.S. government agencies	48,831				(1,190		)		8			—			—			—	48,831		(1,190		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,402,172				(82,558		)		67			—			—			—	1,402,172		(82,558		)
	Nonagency	—				—				—			—			—			—	—		—
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	189,606				(10,312		)		18			—			—			—	189,606		(10,312		)
	Collateralized loan obligations:
	Nonagency	—				—				—			—			—			—	—		—
	Corporate debt securities	64,541				(725		)		23			—			—			—	64,541		(725		)
	Total held-to-maturity securities	$	2,373,148			$	(118,026	)		492			$	2,478		$	(183	)	6	$	2,375,626	$	(118,209	)
		31-Dec-12
		Less than 12 months											12 months or longer							Total
		Fair Value				Unrealized				Number			Fair Value			Unrealized			Number	Fair Value		Unrealized
						Losses				Impaired						Losses			Impaired			Losses
										Securities									Securities
Securities available-for-sale
Debt securities
	U.S. states and political subdivisions	$	14,110			$	(229	)		24			$	—		$	—		—	$	14,110	$	(229	)
	Residential mortgage-backed securities:
	U.S. government agencies	14				—				1			13			—			1	27		—
	Commercial mortgage-backed securities:
	U.S. government agencies	31,237				(406		)		3			—			—			—	31,237		(406		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	133,008				(258		)		9			389			(2		)	1	133,397		(260		)
	Nonagency	—				—				—			2			—			1	2		—
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	35,316				(138		)		4			—			—			—	35,316		(138		)
	Corporate debt securities	—				—				—			49,652			(11,889		)	8	49,652		(11,889		)
	Total available-for-sale securities	$	213,685			$	(1,031	)		41			$	50,056		$	(11,891	)	11	$	263,741	$	(12,922	)
Securities held-to-maturity
Debt securities
	U.S. states and political subdivisions	$	6,543			$	(70	)		12			$	—		$	—		—	$	6,543	$	(70	)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	17,413				(16		)		1			—			—			—	17,413		(16		)
	Total held-to-maturity securities	$	23,956			$	(86	)		13			$	—		$	—		—	$	23,956	$	(86	)
At least quarterly, the Corporation conducts a comprehensive security-level impairment assessment on all securities in an unrealized loss position to determine if OTTI exists. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Under the current OTTI accounting model for debt securities, an OTTI loss must be recognized for a debt security in an unrealized loss position if the Corporation intends to sell the security or it is more likely than not that the Corporation will be required to sell the security before recovery of its amortized cost basis. In this situation, the amount of loss recognized in income is equal to the difference between the fair value and the amortized cost basis of the security. Even if the Corporation does not expect to sell the security, the Corporation must evaluate the expected cash flows to be received to determine if a credit loss has occurred. In the event of a credit loss, only the amount of impairment associated with the credit loss is recognized in income. The portion of the unrealized loss relating to other factors, such as liquidity conditions in the market or changes in market interest rates, is recorded in other comprehensive income. Equity securities are also evaluated to determine whether the unrealized loss is expected to be recoverable based on whether evidence exists to support a realizable value equal to or greater than the amortized cost basis. If it is probable that the Corporation will not recover the amortized cost basis, taking into consideration the estimated recovery period and its ability to hold the equity security until recovery, OTTI is recognized.
The security-level assessment is performed on each security, regardless of the classification of the security as available for sale or held to maturity. The assessments are based on the nature of the securities, the financial condition of the issuer, the extent and duration of the securities, the extent and duration of the loss and the intent and whether Management intends to sell or it is more likely than not that it will be required to sell a security before recovery of its amortized cost basis, which may be maturity. For those securities for which the assessment shows the Corporation will recover the entire cost basis, Management does not intend to sell these securities and it is not more likely than not that the Corporation will be required to sell them before the anticipated recovery of the amortized cost basis, the gross unrealized losses are recognized in other comprehensive income, net of tax.
The investment securities portfolio was in a net unrealized loss position of $55.9 million at December 31, 2013, compared to a net unrealized gain position of $72.2 million at December 31, 2012. Gross unrealized losses were $90.2 million as of December 31, 2013, compared to $12.9 million at December 31, 2012. As of December 31, 2013, gross unrealized losses are concentrated within agency MBS and corporate debt securities. The fair values of the agency MBSs have been impacted by the rising interest rate environment throughout 2013 relative to when they were purchased. Corporate debt securities are composed of eight, single issuer, trust preferred securities with stated maturities. Such investments are less than 2% of the fair value of the entire investment portfolio. None of the corporate issuers have deferred paying dividends on their issued trust preferred shares in which the Corporation is invested. The fair values of these investments have been impacted by the market conditions which have caused risk premiums to increase, resulting in the decline in the fair value of the trust preferred securities.
Management believes the Corporation will fully recover the cost of these agency MBSs and corporate debt securities, and it does not intend to sell these securities and it is not more likely than not that it will be required to sell them before the anticipated recovery of the remaining amortized cost basis, which may be maturity. As a result, Management concluded that these securities were not other-than-temporarily impaired at December 31, 2013 and has recognized the total amount of the impairment in other comprehensive income, net of tax.
The Corporation also holds $223.5 million of CLOs with a gross unrealized loss position of $4.3 million as of December 31, 2013. The new Volcker regulations, as originally adopted, may affect the Corporation's ability to hold these CLOs. Management believes that its holdings of CLOs are not ownership interests in a covered fund prohibited by the Volcker regulations, and, therefore, expect to be able to hold these investments until their stated maturities with no restriction.
Contractual Maturity of Debt Securities
The following table shows the remaining contractual maturities and contractual yields of debt securities held-to-maturity and available-for-sale as of December 31, 2013. Estimated lives on MBSs may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

Loans

Loans	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Loans and Allowance for Loan Losses	'
	4.    Loans
	Loans outstanding as of December 31, 2013 and 2012, net of unearned income, consisted of the following:
			December 31, 2013				December 31, 2012
	Originated loans (a):
	Commercial		$	6,648,279			$	5,866,489
	Residential mortgage		529,253				445,211
	Installment		1,727,925				1,328,258
	Home equity		920,066				806,078
	Credit cards		148,313				146,387
	Leases		239,551				139,236
		Total originated loans (a)	10,213,387				8,731,659
	Allowance for originated loan losses		(96,484		)		(98,942		)
		Net originated loans	$	10,116,903			$	8,632,717
	Acquired loans:
	Commercial		$	1,725,970			$	—
	Residential mortgage		470,652				—
	Installment		1,004,569				—
	Home equity		294,424				—
		Total acquired loans	3,495,615				—
	Allowance for acquired loan losses		(741		)		—
		Net acquired loans	$	3,494,874			$	—
	Covered loans:
	Commercial		375,860				718,437
	Residential mortgage		50,679				61,540
	Installment		6,162				8,189
	Home equity		97,442				117,225
	Loss share receivable		61,827				113,734
		Total covered loans	591,970				1,019,125
	Allowance for covered loan losses		(44,027		)		(43,255		)
		Net covered loans	$	547,943			$	975,870
	Total loans:
	Commercial		$	8,750,109			$	6,584,926
	Residential mortgage		1,050,584				506,751
	Installment		2,738,656				1,336,447
	Home equity		1,311,932				923,303
	Credit cards		148,313				146,387
	Leases		239,551				139,236
	Loss share receivable		61,827				113,734
		Total loans	14,300,972				9,750,784
	Total allowance for loan losses		(141,252		)		(142,197		)
		Total Net loans	$	14,159,720			$	9,608,587
	(a) Includes acquired FirstBank loans of $49.2 million and $54.2 million as of December 31, 2013 and 2012, respectively.
	The Corporation makes loans to officers on the same terms and conditions as made available to all employees and to directors on substantially the same terms and conditions as transactions with other parties. An analysis of loan activity with related parties for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:
		Year Ended December 31,
		2013				2012				2011
	Aggregate amount at beginning of year	$	16,578			$	15,629			$	15,723
	New loans	11,507				3,500				2,458
	Repayments	(4,374		)		(2,739		)		(2,552		)
	Changes in directors and their affiliations	825				188				—
	Aggregate amount at end of year	$	24,536			$	16,578			$	15,629
	The following describes the distinction between originated, acquired and covered loan portfolios and certain significant accounting policies relevant to each of these portfolios.
	Originated Loans
	Loans originated for investment are stated at their principal amount outstanding adjusted for partial charge-offs, the ALLL, and net deferred loan fees and costs. Interest income on loans is accrued over the term of the loans primarily using the "simple-interest" method based on the principal balance outstanding. Interest is not accrued on loans where collectability is uncertain. Accrued interest is presented separately in the Consolidated Balance Sheet, except for accrued interest on credit card loans, which is included in the outstanding loan balance. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield. Net deferred loan origination fees and costs amounted to $6.6 million and $6.5 million at December 31, 2013 and 2012, respectively.
	Acquired Loans
	Acquired loans are those purchased in the Citizens acquisition (See Note 2 (Business Combinations) for further information). These loans were recorded at estimated fair value at the Acquisition Date with no carryover of the related ALLL. The acquired loans were segregated as of the Acquisition Date between those considered to be performing (acquired nonimpaired loans) and those with evidence of credit deterioration (acquired impaired loans). Acquired loans are considered impaired if there is evidence of credit deterioration and if it is probable, at acquisition, all contractually required payments will not be collected. Revolving loans, including lines of credit, are excluded from acquired impaired loan accounting.
	Total outstanding acquired impaired loans as of December 31, 2013 were $817.6 million. Changes in the carrying amount and accretable yield for acquired impaired loans were as follows for the year end December 31, 2013:
		Year Ended
		December 31, 2013
	Acquired Impaired Loans	Accretable Yield				Carrying Amount of Loans
	Balance at beginning of period	$	—			$	—
	Additions due to Citizens acquisition on April 12, 2013	131,558				819,715
	Accretion	(27,144		)		27,144
	Net reclassifications from nonaccretable to accretable	46,361				—
Payments received, net	—				(245,859		)
Disposals	(14,129		)		—
Balance at end of period	$	136,646			$	601,000
Covered Loans and Related Loss Share Receivable
The loans purchased in the 2010 FDIC-assisted acquisitions of George Washington and Midwest are covered by loss sharing agreements between the FDIC and the Corporation that afford the Bank significant loss protection. These covered loans were recorded at estimated fair value at the Acquisition Date with no carryover of the related ALLL and are accounted for as acquired impaired loans. A loss share receivable was recorded at the Acquisition Date which represents the estimated fair value of reimbursement the Corporation expects to receive from the FDIC for incurred losses on certain covered loans. These expected reimbursements are recorded as part of covered loans in the accompanying Consolidated Balance Sheets.
Changes in the loss share receivable associated with covered loans for the years ended December 31, 2013 and 2012, respectively, were as follows:
	Year Ended
Loss Share Receivable	December 31, 2013				December 31, 2012
Balance at beginning of period	$	113,734			$	205,664
Amortization	(24,307		)		(34,903		)
Increase due to impairment on covered loans	10,790				14,728
FDIC reimbursement	(27,234		)		(58,099		)
Covered loans paid in full	(11,156		)		(13,656		)
Balance at end of period	$	61,827			$	113,734
Total outstanding covered impaired loans were $756.1 million and $1.2 billion as of December 31, 2013 and 2012, respectively. Changes in the carrying amount and accretable yield for covered impaired loans were as follows for the years ended December 31, 2013 and 2012:
	Year Ended December 31,
	2013								2012
Covered Impaired Loans	Accretable				Carrying				Accretable			Carrying
	Yield				Amount of				Yield			Amount of
					Loans							Loans
Balance at beginning of period	$	113,288			$	762,386			$	176,736		$	1,128,978
Accretion	(64,528		)		64,528				(96,748		)	96,748
Net reclassifications from nonaccretable to accretable	34,965				—				38,177			—
Payments received, net	—				(423,222		)		—			(463,340		)
Disposals	(16,442		)		—				(4,877		)	—
Balance at end of period	$	67,283			$	403,692			$	113,288		$	762,386
Credit Quality Disclosures
The credit quality of the Corporation's loan portfolios is assessed as a function of net credit losses, levels of nonperforming assets and delinquencies, and credit quality ratings as defined by the Corporation. These credit quality ratings are an important part of the Corporation's overall credit risk management process and evaluation of the allowance for credit losses.
Generally loans, except for certain commercial, credit card and mortgage loans, and leases on which payments are past due for 90 days are placed on nonaccrual status, unless those loans are in the process of collection and, in Management's opinion, are fully secured. Credit card loans on which payments are past due for 120 days are placed on nonaccrual status. Acquired and covered impaired loans are considered to be accruing and performing even though collection of contractual payments may be in doubt because income continues to be accreted on the loan pool as long as expected cash flows are reasonably estimable.
When a loan is placed on nonaccrual status, interest deemed uncollectible which had been accrued in prior years is charged against the ALLL and interest deemed uncollectible accrued in the current year is reversed against interest income. Interest on mortgage loans is accrued until Management deems it uncollectible based upon the specific identification method. Payments subsequently received on nonaccrual loans are generally applied to principal. A loan is returned to accrual status when principal and interest are no longer past due and collectability is probable. This generally requires timely principal and interest payments for a minimum of six consecutive payment cycles. Loans are generally written off when deemed uncollectible or when they reach a predetermined number of days past due depending upon loan product, terms and other factors.
The following tables provide a summary of loans by portfolio type, including the delinquency status of those loans that continue to accrue interest and those loans that are nonaccrual:
As of December 31, 2013
Originated Loans																			≥ 90 Days
	Days Past Due											Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (a)		Loans
Commercial
C&I	$	8,941			$	994			$	10,622		$	20,557		$	4,119,010	$	4,139,567	$	151	$	11,323
CRE	4,507				2,400				9,688			16,595			2,153,192		2,169,787		460		14,229
Construction	351				21				66			438			338,487		338,925		—		122
Leases	902				—				—			902			238,649		239,551		—		—
Consumer
Installment	15,433				4,050				4,462			23,945			1,703,980		1,727,925		3,735		3,681
Home equity lines	1,864				918				965			3,747			916,319		920,066		418		1,819
Credit cards	729				471				735			1,935			146,378		148,313		404		558
Residential mortgages	19,858				2,072				9,350			31,280			497,973		529,253		6,008		10,471
Total	$	52,585			$	10,926			$	35,888		$	99,399		$	10,113,988	$	10,213,387	$	11,176	$	42,203
Acquired Loans																			≥ 90 Days
	Days Past Due											Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing		Loans
Commercial
C&I	$	1,295			$	862			$	3,744		$	5,901		$	788,178	$	794,079	$	40	$	795
CRE	5,603				5,281				26,366			37,250			881,395		918,645		403		651
Construction	2,675				—				—			2,675			10,571		13,246		—		—
Consumer
Installment	14,528				4,076				3,354			21,958			982,611		1,004,569		2,263		679
Home equity lines	4,774				1,933				3,606			10,313			284,111		294,424		1,039		1,300
Residential Mortgages	3,918				1,426				8,063			13,407			457,245		470,652		403		582
Total	$	32,793			$	13,578			$	45,133		$	91,504		$	3,404,111	$	3,495,615	$	4,148	$	4,007
Covered Loans (b)																			≥ 90 Days
	Days Past Due											Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (c)		Loans (c)
Commercial
C&I	$	836			$	1,489			$	12,957		$	15,282		$	60,955	$	76,237
CRE	2,855				3,443				103,077			109,375			164,219		273,594
Construction	2,191				1,917				20,388			24,496			1,533		26,029
Consumer
Installment	33				—				—			33			6,130		6,163
Home equity lines	544				1,467				1,651			3,662			93,780		97,442
Residential mortgages	7,463				1,565				5,165			14,193			36,485		50,678
Total	$	13,922			$	9,881			$	143,238		$	167,041		$	363,102	$	530,143
(a) Installment loans 90 days or more past due and accruing include $2.1 million of loans guaranteed by the U.S. government as of December 31, 2013.
(b) Excludes loss share receivable of $61.8 million as of December 31, 2013.
(c) Acquired impaired loans were not classified as nonperforming assets at December 31, 2013 as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cash flows, is being recognized on all acquired impaired loans. These asset quality disclosures are, therefore, not applicable to acquired impaired loans.
As of December 31, 2012
Originated Loans																			≥ 90 Days
	Days Past Due											Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (a)		Loans
Commercial
C&I	$	3,814			$	1,986			$	3,571		$	9,371		$	3,297,155	$	3,306,526	$	104	$	5,255
CRE	4,181				4,530				11,535			20,246			2,204,170		2,224,416		382		15,780
Construction	981				—				597			1,578			333,969		335,547		—		731
Leases	6				—				—			6			139,230		139,236		—		—
Consumer
Installment	11,722				3,193				5,639			20,554			1,307,704		1,328,258		4,942		2,914
Home Equity Lines	1,584				880				1,227			3,691			802,387		806,078		475		1,557
Credit Cards	969				558				954			2,481			143,906		146,387		438		598
Residential Mortgages	13,291				2,488				5,231			21,010			424,201		445,211		3,076		9,852
Total	$	36,548			$	13,635			$	28,754		$	78,937		$	8,652,722	$	8,731,659	$	9,417	$	36,687
Covered Loans (b)																			≥ 90 Days
	Days Past Due											Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (c)		Loans (c)
Commercial
C&I	$	931			$	981			$	24,111		$	26,023		$	102,486	$	128,509	n/a		n/a
CRE	4,130				15,019				172,444			191,593			348,002		539,595		n/a		n/a
Construction	589				7,925				34,314			42,828			7,505		50,333		n/a		n/a
Consumer
Installment	1				65				21			87			8,102		8,189		n/a		n/a
Home equity lines	1,528				654				2,211			4,393			112,832		117,225		n/a		n/a
Residential mortgages	10,005				442				7,763			18,210			43,330		61,540		n/a		n/a
Total	$	17,184			$	25,086			$	240,864		$	283,134		$	622,257	$	905,391	n/a		n/a
(a) Installment loans 90 days or more past due and accruing include $3.4 million of loans guaranteed by the U.S. government as of December 31, 2012.
(b) Excludes loss share receivable of $113.7 million as of December 31, 2012.
(c) Acquired impaired loans were not classified as nonperforming assets at December 31, 2012 as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cash flows, is being recognized on all acquired impaired loans. These asset quality disclosures are, therefore, not applicable to acquired impaired loans.
Individual commercial loans are assigned credit risk grades based on an internal assessment of conditions that affect a borrower’s ability to meet its contractual obligation under the loan agreement. The assessment process includes reviewing a borrower’s current financial information, historical payment experience, credit documentation, public information, and other information specific to each borrower. Commercial loans are reviewed on an annual, quarterly or rotational basis or as Management becomes aware of information during a borrower’s ability to fulfill its obligation. For consumer loans, Management evaluates credit quality based on the aging status of the loan as well as by payment activity, which is presented in the above tables.
The credit-risk grading process for commercial loans is summarized as follows:
“Pass” Loans (Grades 1, 2, 3, 4) are not considered a greater than normal credit risk. Generally, the borrowers have the apparent ability to satisfy obligations to the bank, and the Corporation anticipates insignificant uncollectible amounts based on its individual loan review.
“Special-Mention” Loans (Grade 5) are commercial loans that have identified potential weaknesses that deserve Management’s close attention. If left uncorrected, these potential weaknesses may result in noticeable deterioration of the repayment prospects for the asset or in the institution’s credit position.
“Substandard” Loans (Grade 6) are inadequately protected by the current financial condition and paying capacity of the obligor or by any collateral pledged. Loans so classified have a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt pursuant to the contractual principal and interest terms. Such loans are characterized by the distinct possibility that the Corporation may sustain some loss if the deficiencies are not corrected.
“Doubtful” Loans (Grade 7) have all the weaknesses inherent in those classified as substandard, with the added characteristic that existing facts, conditions, and values make collection or liquidation in full highly improbable. Such loans are currently managed separately to determine the highest recovery alternatives.
“Loss” Loans (Grade 8) are considered uncollectible and of such little value that their continuance as bankable assets is not warranted. These loans are charged off when loss is identified.
The following tables provide a summary of commercial loans by portfolio type and the Corporation's internal credit quality rating:
As of December 31, 2013
Originated Loans
	Commercial
	C&I				CRE				Construction			Leases
Grade 1	$	34,909			$	241			$	—		$	9,271
Grade 2	108,709				3,730				—			2,900
Grade 3	802,624				315,150				25,632			54,446
Grade 4	3,133,177				1,759,201				306,795			167,022
Grade 5	30,116				46,483				267			5,750
Grade 6	30,032				44,982				6,231			162
Grade 7	—				—				—			—
Total	$	4,139,567			$	2,169,787			$	338,925		$	239,551
Acquired Loans
	Commercial
	C&I				CRE				Construction			Leases
Grade 1	$	—			$	—			$	—		$	—
Grade 2	1,741				703				—			—
Grade 3	79,634				29,224				—			—
Grade 4	643,495				722,307				13,246			—
Grade 5	46,807				93,499				—			—
Grade 6	22,402				72,912				—			—
Grade 7	—				—				—			—
Total	$	794,079			$	918,645			$	13,246		$	—
Covered Loans
	Commercial
	C&I				CRE				Construction			Leases
Grade 1	$	—			$	—			$	—		$	—
Grade 2	968				—				—			—
Grade 3	—				—				—			—
Grade 4	41,115				113,863				601			—
Grade 5	427				6,219				—			—
Grade 6	31,621				153,318				23,208			—
Grade 7	2,106				194				2,220			—
Total	$	76,237			$	273,594			$	26,029		$	—
As of December 31, 2012
Originated Loans
	Commercial
	C&I				CRE				Construction			Leases
Grade 1	$	42,211			$	—			$	—		$	13,119
Grade 2	114,480				3,138				—			179
Grade 3	661,692				254,749				17,652			20,042
Grade 4	2,408,669				1,845,686				311,271			104,037
Grade 5	44,969				53,675				3,057			1,561
Grade 6	34,505				67,168				3,567			298
Grade 7	—				—				—			—
Total	$	3,306,526			$	2,224,416			$	335,547		$	139,236
Covered Loans
	Commercial
	C&I				CRE				Construction			Leases
Grade 1	$	—			$	—			$	—		$	—
Grade 2	1,526				—				—			—
Grade 3	—				—				—			—
Grade 4	73,480				214,987				476			—
Grade 5	3,215				30,708				1,331			—
Grade 6	47,468				292,158				45,838			—
Grade 7	2,820				1,742				2,688			—
Total	$	128,509			$	539,595			$	50,333		$	—

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Notes)	12 Months Ended
	Dec. 31, 2013
Allowance for Loan and Lease Losses [Abstract]	'
Allowance for Loan and Lease Losses	'
	5. Allowance for Loan and Lease Losses
	The Corporation's Credit Policy Division manages credit risk by establishing common credit policies for its subsidiary bank, participating in approval of its loans, conducting reviews of loan portfolios, providing centralized consumer underwriting, collections and loan operation services, and overseeing loan workouts. The Corporation's objective is to minimize losses from its commercial lending activities and to maintain consumer losses at acceptable levels that are stable and consistent with growth and profitability objectives.
	The ALLL is Management's estimate of the amount of probable credit losses inherent in a loan portfolio at the balance sheet date. The following describes the distinctions in methodology used to estimate the ALLL of originated, acquired and covered loan portfolios as well as certain significant accounting policies relevant to each category.
	Allowance for Originated Loan Losses
	Management estimates credit losses based on originated individual loans determined to be impaired and on all other loans grouped based on similar risk characteristics. Management also considers internal and external factors such as economic conditions, loan management practices, portfolio monitoring, and other risks, collectively known as qualitative factors, or Q-factors, to estimate credit losses in the loan portfolio. Q-factors are used to reflect changes in the portfolio's collectability characteristics not captured by historical loss data.
	The Corporation's historical loss component is the most significant of the ALLL components and is based on historical loss experience by credit-risk grade (for commercial loan pools) and payment status (for mortgage and consumer loan pools). The historical loss experience component of the ALLL represents the results of migration analysis of historical net charge-offs for portfolios of loans (including groups of commercial loans within each credit-risk grade and groups of consumer loans by payment status). For measuring loss exposure in a pool of loans, the historical net charge-off or migration experience is utilized to estimate expected losses to be realized from the pool of loans.
	If a nonperforming, substandard loan has an outstanding balance of $0.3 million or greater or if a doubtful loan has an outstanding balance of $0.1 million or greater, as determined by the Corporation's credit-risk grading process, further analysis is performed to determine the probable loss content and assign a specific allowance to the loan, if deemed appropriate. The ALLL relating to originated loans that have become impaired is based on either expected cash flows discounted using the original effective interest rate, the observable market price, or the fair value of the collateral for certain collateral dependent loans.
	The following tables show activity in the originated ALLL, by portfolio segment for the years ended December 31, 2013 and 2012, as well as the corresponding recorded investment in originated loans at the end of the period:
	As of December 31, 2013
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Year ended
	Allowance for originated loan losses, beginning balance		$	36,209			$	20,126			$	3,821			$	639			$	11,154			$	13,724			$	7,384			$	5,885		$	98,942
	Charge-offs		(5,840		)		(1,281		)		(516		)		(1,237		)		(16,683		)		(7,172		)		(5,541		)		(1,903		)	(40,173		)
	Recoveries		7,981				524				507				100				10,519				2,979				1,841				230			24,681
	Provision for loan losses		4,631				(7,104		)		(1,002		)		1,579				6,945				3,369				4,056				560			13,034
	Allowance for originated loan losses, ending balance		$	42,981			$	12,265			$	2,810			$	1,081			$	11,935			$	12,900			$	7,740			$	4,772		$	96,484
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	3,235			$	229			$	—			$	—			$	1,014			$	223			$	312			$	1,133		$	6,146
		Collectively evaluated for impairment	39,746				12,036				2,810				1,081				10,921				12,677				7,428				3,639			90,338
	Total ending allowance for originated loan losses balance		$	42,981			$	12,265			$	2,810			$	1,081			$	11,935			$	12,900			$	7,740			$	4,772		$	96,484
	Originated loans:
		Originated loans individually evaluated for impairment	$	8,053			$	20,616			$	906			$	—			$	27,285			$	6,726			$	1,112			$	23,066		$	87,764
		Originated loans collectively evaluated for impairment	4,131,514				2,149,171				338,019				239,551				1,700,640				913,340				147,201				506,187			10,125,623
	Total ending originated loan balance		$	4,139,567			$	2,169,787			$	338,925			$	239,551			$	1,727,925			$	920,066			$	148,313			$	529,253		$	10,213,387
	As of December 31, 2012
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Year ended
	Allowance for originated loan losses, beginning balance		$	32,363			$	31,857			$	5,173			$	341			$	17,981			$	6,766			$	7,369			$	5,849		$	107,699
	Charge-offs		(22,639		)		(5,312		)		(697		)		(144		)		(18,029		)		(8,949		)		(6,171		)		(3,964		)	(65,905		)
	Recoveries		4,266				911				449				38				11,694				3,441				2,138				235			23,172
	Provision for loan losses		22,219				(7,330		)		(1,104		)		404				(492		)		12,466				4,048				3,765			33,976
	Allowance for originated loan losses, ending balance		$	36,209			$	20,126			$	3,821			$	639			$	11,154			$	13,724			$	7,384			$	5,885		$	98,942
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	577			$	913			$	105			$	—			$	1,526			$	34			$	127			$	1,722		$	5,004
		Collectively evaluated for impairment	35,632				19,213				3,716				639				9,628				13,690				7,257				4,163			93,938
	Total ending allowance for originated loan losses balance		$	36,209			$	20,126			$	3,821			$	639			$	11,154			$	13,724			$	7,384			$	5,885		$	98,942
	Originated loans:
		Originated loans individually evaluated for impairment	$	6,187			$	24,007			$	3,405			$	—			$	30,870			$	6,281			$	1,612			$	24,009		$	96,371
		Originated loans collectively evaluated for impairment	3,300,339				2,200,409				332,142				139,236				1,297,388				799,797				144,775				421,202			8,635,288
	Total ending originated loan balance		$	3,306,526			$	2,224,416			$	335,547			$	139,236			$	1,328,258			$	806,078			$	146,387			$	445,211		$	8,731,659
	Allowance for Acquired Loan Losses
	In accordance with the acquisition method of accounting, the Citizens' loans were recorded at their fair value as of the Acquisition Date and the prior ALLL was eliminated. An ALLL for acquired nonimpaired loans is estimated using a methodology similar to that used for originated loans. The allowance determined for each acquired nonimpaired loan is compared to the remaining fair value adjustment for that loan. If the computed allowance is greater, the excess is added to the allowance through a provision for loan losses. If the computed allowance is less, no additional allowance is recognized. Charge-offs and actual losses first reduce any remaining fair value discount for the loan and once the discount is depleted, losses are applied against the allowance established for that loan. During the year ended December 31, 2013, provision, equal to net charge-offs, of $6.8 million was recorded on acquired nonimpaired loans. These charge-off loans were mainly consumer loans that were written off in accordance with the Corporation's credit policies based on a predetermined number of days past due. As of December 31, 2013, the fair value discount on acquired nonimpaired loans was greater than the required ALLL, therefore, no allowance for acquired nonimpaired loan losses was recorded.
	The ALLL for acquired impaired loans is determined by comparing the present value of the cash flows expected to be collected to the carrying amount for a given pool of loans. Management reforecasts the estimated cash flows expected to be collected on acquired impaired loans on a quarterly basis. If the present value of expected cash flows for a pool is less than its carrying value, impairment is recognized by an increase in the ALLL and a charge to the provision for loan losses. If the present value of expected cash flows for a pool is greater than its carrying value, any previously established ALLL is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool. See Note 4 (Loans) for further information on changes in accretable yield in the current period.
	The following table presents activity in the allowance for acquired impaired loan losses for the year ended December 31, 2013:
			Year Ended December 31,
	Allowance for Acquired Impaired Loan Losses		2013
	Balance at beginning of the period		$	—
	Charge-offs		—
	Recoveries		—
	Provision for loan losses		741
	Balance at end of the period		$	741
	During the year ended December 31, 2013, provision for acquired impaired loan losses of $0.7 million was recognized resulting in an allowance for acquired impaired loan losses of $0.7 million as of December 31, 2013.
	Allowance for Covered Loan Losses
	The ALLL for covered loans is estimated similar to acquired loans as described above except any increase to the allowance and provision for loan losses is partially offset by an increase in the loss share receivable for the portion of the losses recoverable under the loss sharing agreements with the FDIC. As of December 31, 2013, the fair value discount on covered nonimpaired loans was greater than the required ALLL, therefore, no allowance for covered nonimpaired loan losses was recorded.
	The following table presents activity in the allowance for covered impaired loan losses for the years ended December 31, 2013 and 2012:
			Year Ended December 31,
	Allowance for Covered Impaired Loan Losses		2013				2012
	Balance at beginning of the period		$	43,255			$	36,417
		Provision for loan losses before benefit attributable to FDIC loss share agreements	23,892				35,450
		Benefit attributable to FDIC loss share agreements	(10,790		)		(14,728		)
	Net provision for loan losses		13,102				20,722
	Increase in loss share receivable		10,790				14,728
	Loans charged-off		(23,120		)		(28,612		)
Balance at end of the period		$	44,027			$	43,255
During the year ended December 31, 2013, provision for covered impaired loan losses of $23.9 million and an offsetting increase of $10.8 million in the loss share receivable resulted in the recognition of a net provision for loan losses of $13.1 million. This net provision compares to $20.7 million in the year ended December 31, 2012 and $20.4 million in the year ended December 31, 2011.
Credit Quality
A loan is considered to be impaired when, based on current events or information, it is probable the Corporation will be unable to collect all amounts due (principal and interest) per the contractual terms of the loan agreement.
Loan impairment is measured based on either the present value of expected future cash flows discounted at the loan's effective interest rate, at the observable market price of the loan, or the fair value of the collateral for certain collateral dependent loans. Impaired loans include all nonaccrual commercial, agricultural, construction, and commercial real estate loans, and loans modified as a TDR, regardless of nonperforming status. Acquired and covered impaired loans are not considered or reported as impaired loans. Nonimpaired acquired loans that are subsequently placed on nonaccrual status are reported as impaired loans and included in the tables below. Acquired loans restructured after acquisition are not considered or reported as TDRs if the loans evidenced credit deterioration as of the date of acquisition and are accounted for in pools.
The following tables provide further detail on impaired loans individually evaluated for impairment and the associated ALLL. Certain impaired loans do not have a related ALLL as the valuation of these impaired loans exceeded the recorded investment.
As of December 31, 2013
						Unpaid								Average
		Recorded				Principal				Related				Recorded
		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	2,503			$	6,679			$	—			$	7,256
	CRE	17,871				23,709				—				18,639
	Construction	906				1,179				—				1,035
Consumer
	Installment	2,813				3,978				—				3,338
	Home equity line	1,018				1,347				—				1,079
	Credit card	49				49				—				91
	Residential mortgages	10,250				12,778				—				10,258
Subtotal		35,410				49,719				—				41,696
Impaired loans with a related allowance
Commercial
	C&I	5,551				7,428				3,235				5,009
	CRE	2,744				2,870				229				2,836
	Construction	—				—				—				—
Consumer
	Installment	24,472				24,558				1,014				24,985
	Home equity line	5,707				5,707				223				5,874
	Credit card	1,064				1,064				312				1,238
	Residential mortgages	12,816				12,898				1,133				12,064
Subtotal		52,354				54,525				6,146				52,006
	Total impaired loans	$	87,764			$	104,244			$	6,146			$	93,702
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
As of December 31, 2012
						Unpaid								Average
		Recorded				Principal				Related				Recorded
		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	3,098			$	14,473			$	—			$	12,533
	CRE	19,664				26,402				—				23,911
	Construction	2,684				3,306				—				3,861
Consumer
	Installment	2,527				3,947				—				4,251
	Home equity line	642				849				—				860
	Credit card	467				467				—				568
	Residential mortgages	9,578				12,142				—				10,645
Subtotal		38,660				61,586				—				56,629
Impaired loans with a related allowance
Commercial
	C&I	3,089				4,943				577				4,231
	CRE	4,343				4,927				913				3,834
	Construction	721				721				105				730
Consumer
	Installment	28,343				28,706				1,526				29,583
	Home equity line	5,639				5,639				34				5,924
	Credit card	1,145				1,145				127				1,311
	Residential mortgages	14,431				14,520				1,722				14,537
Subtotal		57,711				60,601				5,004				60,150
	Total impaired loans	$	96,371			$	122,187			$	5,004			$	116,779
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
Troubled Debt Restructurings
In certain circumstances, the Corporation may modify the terms of a loan to maximize the collection of amounts due when a borrower is experiencing financial difficulties or is expected to experience difficulties in the near term. In most cases the modification is either a concessionary reduction in interest rate, extension of the maturity date or modification of the adjustable rate provisions of the loan that would otherwise not be considered; however, forgiveness of principal is rarely granted. Concessionary modifications are classified as TDRs unless the modification is short-term, typically less than 90 days. TDRs accrue interest if the borrower complies with the revised terms and conditions and has demonstrated repayment performance at a level commensurate with the modified terms for a minimum of six consecutive payment cycles after the restructuring date. Acquired loans restructured after acquisition are not considered or reported as TDRs if the loans evidenced credit deterioration as of the Acquisition Date and are accounted for in pools.
The substantial majority of the Corporation's residential mortgage TDRs involve reducing the client's loan payment through an interest rate reduction for a set period of time based on the borrower's ability to service the modified loan payment. Modifications of mortgages retained in portfolio are handled using proprietary modification guidelines, or the FDIC's Modification Program for residential first mortgages covered by loss share agreements (agreements between the Bank and the FDIC that afford the Bank significant protection against future losses). The Corporation participates in the U.S. Treasury's Home Affordable Modification Program for originated mortgages sold to and serviced for FNMA and FHLMC.
Commercial and industrial loans modified in a TDR often involve temporary interest-only payments, term extensions and converting revolving credit lines to term loans. Additional collateral, a co-borrower, or a guarantor is often requested. Commercial real estate and construction loans modified in a TDR often involve reducing the interest rate for the remaining term of the loan, extending the maturity date at an interest rate lower than the current market rate for new debt with similar risk, or substituting or adding a new borrower or guarantor. Construction loans modified in a TDR may also involve extending the interest-only payment period. The Corporation has modified certain loans according to provisions in loss share agreements. Losses associated with modifications on these loans, including the economic impact of interest rate reductions, are generally eligible for reimbursement under the loss share agreements.
The following tables provide the number of loans modified in a TDR and the recorded investment and unpaid principal balance by loan portfolio as of December 31, 2013 and 2012.
			As of December 31, 2013
			Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I	35			$	4,449			$	7,660
		CRE	52			15,932				20,569
		Construction	30			905				1,179
		Total originated commercial	117			21,286				29,408
	Consumer
		Installment	1,553			27,285				28,536
		Home equity lines	231			6,725				7,054
		Credit card	307			1,113				1,113
		Residential mortgages	301			23,067				25,676
		Total originated consumer	2,392			58,190				62,379
Total originated loans			2,509			$	79,476			$	91,787
Acquired Loans
	Commercial
		C&I	1			6				5
		CRE	1			1,730				1,730
		Total acquired commercial	2			1,736				1,735
	Consumer
		Installment	12			505				542
		Home equity lines	8			245				270
		Residential mortgages	7			431				502
		Total acquired consumer	27			1,181				1,314
Total acquired loans			29			2,917				3,049
Covered loans
	Commercial
		C&I	4			$	1,104			$	2,331
		CRE	24			39,995				57,008
		Construction	10			4,144				24,547
		Total covered commercial	38			45,243				83,886
	Consumer
		Home equity lines	47			5,401				5,421
		Residential mortgages	1			$	150			$	150
		Total covered consumer	48			5,551				5,571
Total covered loans			86			$	50,794			$	89,457
Total loans
	Commercial
		C&I	40			$	5,559			$	9,996
		CRE	77			57,657				79,307
		Construction	40			5,049				25,726
		Total commercial	157			68,265				115,029
	Consumer
		Installment	1,565			27,790				29,078
		Home equity lines	286			12,371				12,745
		Credit card	307			1,113				1,113
		Residential mortgages	309			23,648				26,328
		Total consumer	2,467			64,922				69,264
Total loans			2,624			$	133,187			$	184,293
Note 1: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
				As of December 31, 2012
				Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I		24			$	2,617			$	8,044
		CRE		40			16,305				20,701
		Construction		28			2,955				3,419
		Total originated commercial		92			21,877				32,164
	Consumer
		Installment		1,769			30,870				32,653
		Home equity lines		226			6,281				6,488
		Credit card		389			1,612				1,612
		Residential mortgages		298			24,009				26,662
		Total originated consumer		2,682			62,772				67,415
Total originated loans				2,774			$	84,649			$	99,579
Covered loans
	Commercial
		C&I		3			$	1,763			$	1,998
		CRE		20			50,272				57,483
		Construction		10			8,171				37,547
		Total covered commercial		33			60,206				97,028
	Consumer
		Home equity lines		35			5,632				5,666
Total covered loans				68			$	65,838			$	102,694
Total loans
	Commercial
		C&I		27			$	4,380			$	10,042
		CRE		60			66,577				78,184
		Construction		38			11,126				40,966
		Total commercial		125			82,083				129,192
	Consumer
		Installment		1,769			30,870				32,653
		Home equity lines		261			11,913				12,154
		Credit card		389			1,612				1,612
		Residential mortgages		298			24,009				26,662
		Total consumer		2,717			68,404				73,081
Total loans				2,842			$	150,487			$	202,273
Note 1: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
The pre-modification and post-modification outstanding recorded investments of loans modified as TDRs during the years ended December 31, 2013 and 2012 were not materially different. Post-modification balances may include capitalization of unpaid accrued interest and fees associated with the modification as well as forgiveness of principal. Loans modified as TDRs during the years ended December 31, 2013 and 2012 did not involve the forgiveness of principal, accordingly, the Corporation did not record a charge-off at the modification date. Additionally, capitalization of any unpaid accrued interest and fees assessed to loans modified in the years ended December 31, 2013 and 2012 were not material to the accompanying consolidated financial statements. Specific allowances for loan losses are established for loans whose terms have been modified in a TDR. Specific reserve allocations are generally assessed prior to loans being modified in a TDR, as most of these loans migrate from the Corporation's internal watch list and have been specifically allocated for as part of the Corporation's normal loan loss provisioning methodology. At December 31, 2013, the Corporation had $0.2 million in commitments to lend additional funds to debtors owing receivables whose terms have been modified in a TDR.
The following tables provide a summary of the delinquency status of TDRs along with the specific allowance for loan loss, by loan type, as of December 31, 2013 and 2012, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
As of December 31, 2013
	Accruing TDRs												Nonaccruing TDRs												Total				Total
	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	1,438			$	879			$	2,317			$	177			$	1,955			$	2,132			$	4,449			$	665
CRE	10,442				382				10,824				1,208				3,900				5,108				15,932				32
Construction	848				—				848				—				57				57				905				—
Total originated commercial	12,728				1,261				13,989				1,385				5,912				7,297				21,286				697
Consumer
Installment	23,342				1,238				24,580				2,483				222				2,705				27,285				540
Home equity lines	5,313				194				5,507				1,206				12				1,218				6,725				197
Credit card	1,046				66				1,112				—				1				1				1,113				254
Residential mortgages	12,276				3,327				15,603				4,360				3,104				7,464				23,067				1,308
Total originated consumer	41,977				4,825				46,802				8,049				3,339				11,388				58,190				2,299
Total originated TDRs	$	54,705			$	6,086			$	60,791			$	9,434			$	9,251			$	18,685			$	79,476			$	2,996
Acquired loans
Commercial
C&I	—				—				—				6				—				6				6				—
CRE	1,730				—				1,730				—				—				—				1,730				—
Total acquired commercial	1,730				—				1,730				6				—				6				1,736				—
Consumer
Installment	369				136				505				—				—				—				505				50
Home equity lines	182				—				182				63				—				63				245				384
Residential mortgages	245				—				245				32				154				186				431				307
Total acquired consumer	796				136				932				95				154				249				1,181				741
Total acquired TDRs	$	2,526			$	136			$	2,662			$	101			$	154			$	255			$	2,917			$	741
Covered loans
Commercial
C&I	$	362			$	742			$	1,104			$	—			$	—			$	—			$	1,104			$	—
CRE	5,259				34,736				39,995				—				—				—				39,995				3,022
Construction	698				3,446				4,144				—				—				—				4,144				800
Total covered commercial	6,319				38,924				45,243				—				—				—				45,243				3,822
Consumer
Home equity lines	5,377				24				5,401				—				—				—				5,401				—
Residential mortgages	150				—				150				—				—				—				150				—
Total covered consumer	5,527				24				5,551				—				—				—				5,551				—
Total covered TDRs	$	11,846			$	38,948			$	50,794			$	—			$	—			$	—			$	50,794			$	3,822
Total loans
Commercial
C&I	$	1,800			$	1,621			$	3,421			$	183			$	1,955			$	2,138			$	5,559			$	665
CRE	17,431				35,118				52,549				1,208				3,900				5,108				57,657				3,054
Construction	1,546				3,446				4,992				—				57				57				5,049				800
Total commercial	20,777				40,185				60,962				1,391				5,912				7,303				68,265				4,519
Consumer
Installment	23,711				1,374				25,085				2,483				222				2,705				27,790				590
Home equity lines	10,872				218				11,090				1,269				12				1,281				12,371				581
Credit card	1,046				66				1,112				—				1				1				1,113				254
Residential mortgages	12,671				3,327				15,998				4,392				3,258				7,650				23,648				1,615
Total consumer	48,300				4,985				53,285				8,144				3,493				11,637				64,922				3,040
Total TDRs	$	69,077			$	45,170			$	114,247			$	9,535			$	9,405			$	18,940			$	133,187			$	7,559
As of December 31, 2012
	Accruing TDRs												Nonaccruing TDRs												Total				Total
	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	704			$	1,004			$	1,708			$	844			$	65			$	909			$	2,617			$	217
CRE	12,719				793				13,512				461				2,332				2,793				16,305				869
Construction	1,860				960				2,820				135				—				135				2,955				105
Total originated commercial	15,283				2,757				18,040				1,440				2,397				3,837				21,877				1,191
Consumer
Installment	27,085				1,547				28,632				2,064				174				2,238				30,870				1,526
Home equity lines	5,183				236				5,419				636				226				862				6,281				34
Credit card	1,483				118				1,601				—				11				11				1,612				127
Residential mortgages	12,510				3,413				15,923				5,196				2,890				8,086				24,009				1,722
Total originated consumer	46,261				5,314				51,575				7,896				3,301				11,197				62,772				3,409
Total originated TDRs	$	61,544			$	8,071			$	69,615			$	9,336			$	5,698			$	15,034			$	84,649			$	4,600
Covered loans
Commercial
C&I	$	435			$	1,328			$	1,763			$	—			$	—			$	—			$	1,763			$	518
CRE	7,658				42,614				50,272				—				—				—				50,272				4,959
Construction	2,361				5,810				8,171				—				—				—				8,171				1,220
Total covered commercial	10,454				49,752				60,206				—				—				—				60,206				6,697
Consumer
Home equity lines	5,632				—				5,632				—				—				—				5,632				—
Total covered consumer	5,632				—				5,632				—				—				—				5,632				—
Total covered TDRs	$	16,086			$	49,752			$	65,838			$	—			$	—			$	—			$	65,838			$	6,697
Total loans
Commercial
C&I	$	1,139			$	2,332			$	3,471			$	844			$	65			$	909			$	4,380			$	735
CRE	20,377				43,407				63,784				461				2,332				2,793				66,577				5,828
Construction	4,221				6,770				10,991				135				—				135				11,126				1,325
Total commercial	25,737				52,509				78,246				1,440				2,397				3,837				82,083				7,888
Consumer
Installment	27,085				1,547				28,632				2,064				174				2,238				30,870				1,526
Home equity lines	10,815				236				11,051				636				226				862				11,913				34
Credit card	1,483				118				1,601				—				11				11				1,612				127
Residential mortgages	12,510				3,413				15,923				5,196				2,890				8,086				24,009				1,722
Total consumer	51,893				5,314				57,207				7,896				3,301				11,197				68,404				3,409
Total TDRs	$	77,630			$	57,823			$	135,453			$	9,336			$	5,698			$	15,034			$	150,487			$	11,297
Loans modified in a TDR are closely monitored for delinquency as an early indicator of possible future default. If loans modified in a TDR subsequently default, the Corporation evaluates the loan for possible further impairment. The ALLL may be increased, adjustments may be made in the allocation of the ALLL, or partial charge-offs may be taken to further write-down the carrying value of the loan.
The following table provides the number of loans modified in a TDR during the previous 12 months that subsequently defaulted during the year ended December 31, 2013, as well as the recorded investment in these restructured loans as of December 31, 2013.
	As of December 31, 2013
	Number of Loans			Recorded Investment
Originated loans
Commercial
C&I	4			$	1,773
CRE	6			3,101
Construction	1			231
Total originated commercial	11			5,105
Consumer
Installment	17			170
Home equity lines	—			—
Credit card	33			245
Residential mortgages	1			75
Total originated consumer	51			$	490
Covered loans
Commercial
C&I	—			$	—
CRE	1			—
Construction	1			45
Total covered commercial	2			$	45
Total loans	64			5,640
Commercial
C&I	4			$	1,773
CRE	7			3,101
Construction	2			276
Total commercial	13			5,150
Consumer
Installment	17			170
Home equity lines	—			—
Credit card	33			245
Residential mortgages	1			75
Total consumer	51			490
Total	64			$	5,640
	As of December 31, 2012
	Number of Loans			Recorded Investment
Originated loans
Commercial
C&I	3			$	1,603
CRE	1			500
Construction	—			—
Total originated commercial	4			2,103
Consumer
Installment	11			280
Home equity lines	—			—
Credit card	37			273
Residential mortgages	1			21
Total originated consumer	49			$	574
Covered loans
Commercial
C&I	—			$	—
CRE	—			—
Construction	1			716
Total covered commercial	1			$	716
Total loans	54			3,393
Commercial
C&I	3			$	1,603
CRE	1			500
Construction	1			716
Total commercial	5			2,819
Consumer
Installment	11			280
Home equity lines	—			—
Credit card	37			273
Residential mortgages	1			21
Total consumer	49			574
Total	54			$	3,393

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	6. Goodwill and Other Intangible Assets
	Goodwill
	Goodwill totaled $739.8 million as of December 31, 2013 and $460.0 million as of December 31, 2012 and is allocated among the business segments. Changes to the carrying amount of goodwill not subject to amortization for the years ended December 31, 2011, 2012 and 2013 are provided in the following table:
		Commercial		Retail			Wealth		Total
	Balance at December 31, 2011	$	384,721	$	66,141		$	9,182	$	460,044
	Balance at December 31, 2012	384,721		66,141			9,182		460,044
	Goodwill Acquired	$	142,685	$	125,899		$	11,191	$	279,775
	Balance at December 31, 2013	$	527,406	$	192,040		$	20,373	$	739,819
	The acquisition resulting in the acquired goodwill is more fully described in Note 2 (Business Combinations).
	The Corporation performed the required annual impairment tests of goodwill as of November 30, 2013. The Corporation's annual impairment test did not indicate impairment at any of its reporting units. It is possible that a future conclusion could be reached that all or a portion of the Corporation's goodwill may be impaired, in which case a noncash charge for the amount of such impairment would be recorded in earnings.
	Other Intangible Assets
	The following tables show the gross carrying amount and the amount of accumulated amortization of intangible assets subject to amortization.
		December 31, 2013
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	87,533	$	(16,065	)	$	71,468
	Noncompete covenant	102		(102		)	—
	Lease intangible	618		(520		)	98
	Trust intangibles	14,000		(2,811		)	11,189
		$	102,253	$	(19,498	)	$	82,755
		December 31, 2012
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	16,759	$	(10,546	)	$	6,213
	Noncompete covenant	102		(76		)	26
	Lease intangible	618		(484		)	134
		$	17,479	$	(11,106	)	$	6,373
	Core deposit intangibles comprise the majority of the intangible asset total as of December 31, 2013. As discussed in Note 2 (Business Combinations), the Corporation recorded approximately $84.8 million of intangible assets in connection with its acquisition of Citizens. These assets consist of $70.8 million in core deposit intangibles which are being amortized on an accelerated basis over their useful lives of 15 years, and $14.0 million in trust relationship intangibles that are being amortized on an accelerated basis over their useful lives of 12 years. The remaining core deposit intangibles were acquired through various prior acquisitions and are being amortized on an accelerated basis over their useful lives of 10 years.
	Amortization expense for intangible assets was $8.4 million in 2013, $1.9 million in 2012 and $2.2 million in 2011.
	The following table shows the estimated future amortization expense for intangible assets subject to amortization as of December 31, 2013.
	For the years ended:
	December 31, 2014	$	11,732
	December 31, 2015	10,391
	December 31, 2016	9,209
	December 31, 2017	8,161
	December 31, 2018	7,273
		$	46,766

Mortgage_Servicing_Rights_and_

Mortgage Servicing Rights and Mortgage Servicing Activity	12 Months Ended
	Dec. 31, 2013
Transfers and Servicing [Abstract]	'
Mortgage Servicing Rights and Mortgage Servicing Activity	'
	Mortgage Servicing Rights and Mortgage Servicing Activity
	In the years ended December 31, 2013 and 2012, the Corporation sold residential mortgage loans from the held for sale portfolio with unpaid principal balances of $562.3 million and $745.4 million, respectively, and recognized pretax gains of $12.1 million and $12.1 million, respectively, which are included as a component of loan sales and servicing income. As of December 31, 2013 and 2012, the Corporation retained the related mortgage servicing rights on $514.6 million and $710.6 million, respectively, of the loans sold and receives servicing fees.
	The Corporation serviced for third parties approximately $2.7 billion of residential mortgage loans at December 31, 2013 and $2.4 billion at December 31, 2012. Loan servicing fees, not including valuation changes on mortgage servicing rights included in loan sales and servicing income, were $6.4 million, $5.8 million and $5.4 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Servicing rights are presented within other assets on the accompanying Consolidated Balance Sheet. The retained servicing rights are initially valued at fair value. Since mortgage servicing rights do not trade in an active market with readily observable prices, the Corporation relies primarily on a discounted cash flow analysis model to estimate the fair value of its mortgage servicing rights. Additional information can be found in Note 17 (Fair Value Measurement). Mortgage servicing rights are subsequently measured using the amortization method. Accordingly, the mortgage servicing rights are amortized over the period of, and in proportion to, the estimated net servicing income and is recorded in loan sales and servicing income.
	Changes in the carrying amount of mortgage servicing rights and mortgage servicing rights valuation allowance are as follows:
		Year Ended December 31,
		2013			2012			2011
	Balance at beginning of period	$	21,316		$	21,179		$	21,317
	Addition of Citizens' MSR's on Acquisition Date	994			—			—
	Additions	4,952			5,876			4,442
	Amortization	(4,502		)	(5,739		)	(4,580		)
	Balance at end of period	22,760			21,316			21,179
	Valuation allowance at beginning of period	(2,564		)	(3,539		)	—
	Recoveries (Additions)	2,282			975			(3,539		)
	Valuation Allowance at end of period	(282		)	(2,564		)	(3,539		)
	Mortgage servicing rights, net carrying balance	$	22,478		$	18,752		$	17,640
	Fair value at end of period	$	23,041		$	18,833		$	17,749
	On a quarterly basis, the Corporation assesses its capitalized servicing rights for impairment based on their current fair value. For purposes of the impairment, the servicing rights are disaggregated based on loan type and interest rate which are the predominant risk characteristics of the underlying loans. A valuation allowance is established through a charge to earnings to the extent the amortized cost of the mortgage servicing rights exceeds the estimated fair value by stratification. If it is later determined that all or a portion of the temporary impairment no longer exists for the stratification, the valuation is reduced through a recovery to earnings. There was a valuation allowance of $0.3 million as of December 31, 2013, a valuation allowance of $2.6 million as of December 31, 2012 and a valuation allowance of $3.5 million as of December 31, 2011. No permanent impairment losses were written off against the allowance during the years ended December 31, 2013, 2012 and 2011.
	Key economic assumptions and the sensitivity of the current fair value of the mortgage servicing rights related to immediate 10% and 25% adverse changes in those assumptions at December 31, 2013 are presented in the following table below. These sensitivities are hypothetical and should be used with caution. As the figures indicate, changes in the fair value based on 10% variation in the prepayment speed assumption generally cannot be extrapolated because the relationship of the change in the prepayment speed assumption to the change in fair value may not be linear. Also, in the below table, the effect of a variation in the discount rate assumption on the fair value of the mortgage servicing rights is calculated independently without changing any other assumption. In reality, changes in one factor may result in changes in another (for example, changes in prepayment speed estimates could result in changes in the discount rates), which might magnify or counteract the sensitivities.
	Prepayment speed assumption (annual CPR)	9.67		%
	Decrease in fair value from 10% adverse change	$	745
	Decrease in fair value from 25% adverse change	$	1,789
	Discount rate assumption	9.85		%
	Decrease in fair value from 100 basis point adverse change	$	719
	Decrease in fair value from 200 basis point adverse change	$	1,391
	Expected weighted-average life (in months)	100.5
	The following table shows the estimated future amortization for mortgage servicing rights as of December 31, 2013:
	Year Ended December 31,
	2014	$	3,588
	2015	3,241
	2016	2,759
	2017	2,339
	2018	1,971
	more than 5 years	8,580
		$	22,478

Restrictions_on_Cash_and_Divid

Restrictions on Cash and Dividends	12 Months Ended
	Dec. 31, 2013
Restrictions on Cash and Dividends [Abstract]	'
Restrictions on Cash and Dividends	'
	Restrictions on Cash and Dividends
	The average balance on deposit with the FRB or other governing bodies to satisfy reserve requirements amounted to $41.8 million and $10.2 million during 2013 and 2012, respectively. The level of this balance is based upon amounts and types of customers' deposits held by the banking subsidiary of the Corporation. In addition, deposits are maintained with other banks at levels determined by Management based upon the volumes of activity and prevailing interest rates to compensate for check-clearing, safekeeping, collection and other bank services performed by these banks. At December 31, 2013, cash and due from banks included $0.1 million deposited with the FRB and other banks for these reasons.
	Dividends paid by the subsidiaries are the principal source of funds to enable the payment of dividends by the Corporation to its shareholders. These payments by the subsidiaries in 2013 were restricted, by the regulatory agencies, principally to the total of 2013 net income plus undistributed net income of the previous two calendar years. Regulatory approval must be obtained for the payment of dividends of any greater amount.

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Premises and Equipment	'
	Premises and Equipment
	The components of premises and equipment are as follows:
		As of December 31,				Estimated
		2013		2012		useful lives
	Land	$	64,810	$	46,118	-
	Buildings	310,345		200,578		10-35 yrs
	Equipment	156,521		125,342		3-15 yrs
	Leasehold improvements	23,872		20,228		1-20 yrs
	Software	83,989		72,218		3-7 yrs
		639,537		464,484
	Less accumulated depreciation and amortization	312,483		283,335
		$	327,054	$	181,149
	Amounts included in noninterest expense in the accompanying Consolidated Statement of Income for depreciation and amortization aggregated $32.2 million, $23.1 million and $22.9 million for the years ended 2013, 2012 and 2011, respectively.

Certificates_and_Other_Time_De

Certificates and Other Time Deposits	12 Months Ended
	Dec. 31, 2013
Time Deposits [Abstract]	'
Certificates and Other Time Deposits	'
	Certificates and Other Time Deposits
	The aggregate amounts of certificates and other time deposits of $100 thousand and over at December 31, 2013 and 2012 were $882.4 million and $489.9 million, respectively. Interest expense on these certificates and time deposits amounted to $4.5 million, $3.8 million and $6.3 million in 2013, 2012 and 2011, respectively.
	Maturities of certificates and other time deposits as of December 31, 2013 are as follows:
	For the year ended December 31,
	2014	$	1,708,678
	2015	483,667
	2016	129,216
	2017	56,762
	2018	73,018
	2019 and after	9,329
		$	2,460,670

Federal_Funds_Purchased_and_Se

Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings	12 Months Ended
	Dec. 31, 2013
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]	'
Federal Funds Purchased And Securities Sold Under Agreements to Repurchase And Wholesale Borrowings	'
	Borrowed Funds and Trust Preferred Securities
	Borrowed Funds
	The following table presents federal funds purchased, securities sold under agreements to repurchase and the components of our borrowed funds which consist of FHLB advances, long-term subordinated debt, and fixed and variable junior subordinated debentures:
			As of December 31,
			2013			2012
	Federal funds purchased and securities sold under agreements to repurchase		$	851,535		$	1,104,525
	Borrowed Funds
	FHLB advances		$	200,323		$	136,546
	Subordinate debentures		249,928			—
	Fixed and variable junior subordinate deferral debentures		74,500			—
	Other		277			337
	Total borrowed funds		$	525,028		$	136,883
	Securities sold under agreements to repurchase are secured by securities with a carrying value of $1.0 billion and $723.0 million at December 31, 2013 and 2012, respectively. Securities sold under agreements to repurchase have an overnight maturity at December 31, 2013. Selected financial statement information pertaining to the securities sold under agreements to repurchase is as follows:
		As of December 31,
		2013			2012			2011
	Federal funds purchased and securities sold under agreements to repurchase
	Average balance during the year	$	949,068		$	949,756		$	925,803
	Weighted-average annual interest rate during the year	0.13		%	0.12		%	0.36		%
	Maximum month-end balance	$	1,123,795		$	1,104,525		$	1,014,720
	FHLB advances were secured by a lien on residential and other real estate-related loans totaling $2.4 billion at December 31, 2013 and $1.2 billion at December 31, 2012. The FHLB advances have interest rates that range from 1.54% to 4.12% as of December 31, 2013.
	The Corporation issued subordinated notes as part of a public offering on February 4, 2013 in conjunction with the Citizens merger. The offering consisted of $250 million aggregate principal amount of subordinated notes due February 4, 2023 bearing interest at an annual rate of 4.35% payable semi-annually in arrears on February 4 and August 4 of each year.
	Selected financial statement information pertaining to the Corporation's borrowed funds is as follows:
		As of December 31,
		2013			2012			2011
	Borrowed funds
	Average balance during the year	$	474,473		$	175,989		$	298,835
	Weighted-average annual interest rate during the year	3.62		%	2.51		%	2.11		%
	Maximum month-end balance	$	527,155		$	178,489		$	327,997
	The following table illustrates the contractual maturities of the Corporation's borrowed funds at December 31, 2013:
			One Year			One to			Three to		Over Five
			or Less			Three Years			Five Years		Years		Total
	Borrowed funds
	FHLB advances		$	39,883		$	143,470		$	211	$	16,759	$	200,323
	Subordinate debentures		—			—			—		249,928		249,928
	Fixed and variable junior subordinate deferral debentures		—			—			—		74,500		74,500
	Other		63			138			76		—		277
	Total borrowed funds		$	39,946		$	143,608		$	287	$	341,187	$	525,028
	Trust Preferred Securities
	As part of the merger with Citizens, the Corporation now has two active wholly owned trusts formed for the purpose of issuing securities which qualify as regulatory capital. Each of the two active trusts has issued separate offerings of trust preferred securities to investors in 2006 and 2003. The gross proceeds from the issuances were used to purchase junior subordinated deferrable interest debentures issued by Citizens, now assumed by the Corporation, which is the sole asset of each trust. The trust preferred securities of the 2003 special purpose trust are callable at par and must be redeemed in thirty years after issuance while the securities of the 2006 enhanced trust became callable on September 15, 2011 and mature on September 15, 2066. The 2006 enhanced trust preferred securities are listed on the New York Stock Exchange (NYSE symbol CTZ-PrA). The trust preferred securities held by these entities qualify as Tier 1 capital and are classified as long-term debt. In the event of certain changes or amendments to regulatory requirements or federal tax rules, the capital securities are redeemable in whole. In accordance with GAAP, the financial statements of the Trusts are not included in the Corporation's consolidated financial statements. In conjunction with these trusts, the Corporation assumed variable rate junior subordinated deferrable debentures due June 2033 in an amount approximating $25.7 million, associated with the trust preferred securities held by this trust. This debenture bears interest at an annual rate equal to three-month LIBOR plus 3.10%, payable quarterly. Interest is adjusted on a quarterly basis not to exceed 11.75%. This debenture is an unsecured obligation of the Corporation and is junior in right of payment to all future senior indebtedness of the Corporation. The Corporation has guaranteed that interest payments on this debenture made to the trust that will be distributed by the trust to the holders of the trust preferred securities. The trust preferred securities of the special purpose trust are currently callable, at par, and must be redeemed thirty years after issuance. The Corporation additionally assumed 7.50% junior subordinated debentures due September 2066 in an amount approximating $48.7 million (NYSE symbol CTZ-PrA). On October 3, 2006, Citizens Funding Trust I completed a public offering whereby the gross proceeds from the issuance were used to purchase a junior subordinated deferrable interest debenture issued by Citizens, now assumed by the Corporation. This debenture ranks junior to the Corporations outstanding debt, including the other outstanding junior subordinated debentures. The securities of the 2006 enhanced trust became callable on September 15, 2011 and matures on September 15, 2066.
	The Dodd-Frank Act changes the regulatory capital standards that apply to BHCs by requiring the phase-out of the treatment of trust preferred securities and cumulative preferred securities as Tier 1 eligible capital. The three-year phase-out period, commenced January 1, 2013 and will ultimately require us to treat our mandatorily redeemable trust preferred securities as Tier 2 capital. Additionally, U.S. capital rules finalized in July 2013 will require phasing TruPs from Tier 1 to Tier 2 capital consistent with the Dodd-Frank Act's implementation of Basel III. A more thorough discussion of current rulemaking regarding the implementation of U.S. Basel III is in the “Supervision and Regulation” section of this report.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Income tax expense is comprised of the following:
		Year Ended December 31,
		2013				2012				2011
	Taxes currently payable
	Federal	$	20,266			$	45,683			$	45,026
	State	3,496				2,655				1,823
	Deferred expense (benefit)	52,664				4,679				(756		)
		$	76,426			$	53,017			$	46,093
	The actual income tax rate differs from the statutory tax rate as shown in the following table:
			Year Ended December 31,
			2013			2012			2011
	Statutory rate		35	%		35	%		35	%
	Increase (decrease) in rate due to:
		Interest on tax-exempt securities and tax-free loans, net	(3.16	)		(3.23	)		(3.04	)
		Merger expenses at acquisition	0.54			—			—
		Reduction in excess tax reserves	0.11			—			—
		Bank owned life insurance	(2.53	)		(3.10	)		(3.26	)
		State income tax (net)	0.87			0.94			0.72
		Tax credits	(1.89	)		(2.15	)		(2.12	)
		ESOP Dividends	(0.14	)		(0.21	)		(0.24	)
		Nondeductible meals and entertainment	0.27			0.25			0.29
		Other	0.31			0.83			0.48
	Effective tax rates		29.38	%		28.33	%		27.83	%
	Income tax expense as reflected in the previous table excludes net worth-based taxes, which are assessed on financial institutions in lieu of income tax in Ohio, Pennsylvania and Michigan. These taxes are $9.9 million, $7.8 million and $5.5 million in 2013, 2012 and 2011, respectively, and are recorded in other operating expense in the accompanying Consolidated Statement of Income.
	Principal components of the Corporation's net deferred tax asset are summarized as follows:
			Year Ended
			December 31,
			2013				2012
	Deferred tax assets:
		Allowance for credit losses	$	37,857			$	37,341
		Employee benefits	33,615				42,934
		Real Estate Mortgage Investment Credit	5,645				6,201
		Acquired liabilities	13,734				5,041
		Acquired loans	62,993				—
		Available for sale securities	16,819				—
		Loan fees and expenses	2,777				—
		Goodwill	—				2,838
		Core deposit intangible	—				1,275
		Federal NOL carryforwards	190,350				—
		Tax credit carryforwards	47,597				—
		State income tax (net of federal benefit)	4,682				—
			416,069				95,630
	Deferred tax liabilities:
		Leased assets and depreciation	(25,818		)		(6,962		)
		Acquired loans	—				(18,765		)
		Available for sale securities	—				(29,841		)
		FHLB stock	(24,401		)		(25,577		)
		Loan fees and expenses	—				(5,709		)
		Goodwill	(7,129		)		—
		Core deposit intangibles	(25,302		)		—
		Other	(3,510		)		(1,665		)
			(86,160		)		(88,519		)
	Total net deferred tax asset		$	329,909			$	7,111
	At December 31, 2013, the Corporation had gross federal loss carryforwards of $543.9 million that expire in 2028 through 2032, general business credits of $5.7 million that expire in 2028 and $41.9 million of federal alternative minimum tax credits with an indefinite life. In addition, future state income taxes are expected to be reduced by $1.5 million resulting from state NOLs at various levels in various states. This benefit is expected to be fully used during the expiration period of 2014 through 2027.
	The period change in deferred taxes recorded both directly to shareholders' equity and as a part of the income tax expense can be summarized as follows:
			Year Ended December 31,
			2013				2012
	Deferred tax changes reflected in other comprehensive income		$	(27,224	)		$	4,137
	Deferred tax changes reflected in Federal income tax expense		52,665				4,679
	Deferred tax changes reflected in acquired net assets		(348,239		)		—
		Net change in deferred taxes	$	(322,798	)		$	8,816
	Income tax benefits are recognized in the financial statements for a tax position only if it is considered “more likely than not” of being sustained on audit based solely on the technical merits of the income tax position. If the recognition criteria are met, the amount of income tax benefits to be recognized is measured based on the largest income tax benefit that is more than 50 percent likely to be realized on ultimate resolution of the tax position.
A reconciliation of the change in the reserve for uncertain tax positions is as follows:
	Federal and				Accrued				Gross Unrecognized Income Tax Benefits
	State Tax				Interest and
					Penalties
Balance as of January 1, 2013	$	953			$	854			$	1,807
Additions for tax provisions related to prior year	77				72				149
Reduction for tax positions related to prior tax years	(27		)		(664		)		(691		)
Balance at December 31, 2013	$	1,003			$	262			$	1,265
Components of Reserve:
Potential adjustment to nondeductible interest expense	$	30			$	5			$	35
State income tax exposure	973				257				1,230
Balance at December 31, 2013	$	1,003			$	262			$	1,265
Balance as of January 1, 2012	$	946			$	1,491			$	2,437
Additions for tax provisions related to prior year	74				621				695
Reduction for tax positions related to prior year due closed tax years	(28		)		(44		)		(72		)
Reduction for tax positions related to prior tax years	(39		)		(1,214		)		(1,253		)
Balance at December 31, 2012	$	953			$	854			$	1,807
Components of Reserve:
Potential adjustment to nondeductible interest expense	$	30			$	4			$	34
Timing of the accrual for interest on nonperforming assets	—				631				631
State income tax exposure	923				219				1,142
Balance at December 31, 2012	$	953			$	854			$	1,807
The Corporation recognized accrued interest and penalties, as appropriate, related to UTBs, in the effective tax rate. The balance of accrued interest and penalties at the reporting periods is presented in the table above. The reserve of uncertain tax positions is recorded in accrued taxes, expenses and other liabilities on the Consolidated Balance Sheet.
The Corporation are routinely examined by various taxing authorities. With few exceptions, the Corporation is no longer subject to federal, state and local tax examinations by tax authorities for years before 2012. The expiration of statutes of limitation for various jurisdictions is expected to reduce the UTB balance by approximately $0.3 million within the next twelve months. Management anticipates that the UTB balance will increase by $0.5 million as a result of the 2013 tax filings in the next twelve months. If the total amount of UTBs were recognized the effective tax rate would decrease by 49 basis points to 28.90% at December 31, 2013.
Management monitors changes in tax statutes and regulations and the issuance of judicial decisions to determine the potential impact to uncertain income tax positions. As of December 31, 2013, Management had identified no other potential U.S. Treasury regulations or legislative initiatives that could have a significant impact on the UTB balance within the next twelve months.

Benefit_Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Benefit Plans	'
	Benefit Plans
	Pension plans. The Corporation had a noncontributory qualified defined benefit pension plan that covered all eligible legacy FirstMerit employees vested in the pension plan as of December 31, 2006 ("FirstMerit Pension Plan"). The FirstMerit Pension Plan was frozen for nonvested employees and closed to new entrants after December 31, 2006. Effective December 31, 2012, the FirstMerit Pension Plan was frozen resulting in no benefits accruing after December 31, 2012. Employees will have an accrued benefit which will be paid upon retirement.
	Certain former Citizens' employees were covered by a cash balance defined benefit pension plan after the Acquisition Date through December 31, 2013 ("Citizens Pension Plan"). Effective December 31, 2006, the Citizens Pension Plan was frozen, preserving prior earned benefits but discontinuing the accrual of future benefits.
	As of December 31, 2013, the Corporation adopted one noncontributory qualified defined pension plan covering all eligible FirstMerit and former Citizens employees, with the FirstMerit Pension Plan being the surviving plan. The Citizens Pension Plan ceased to exist after December 31, 2013. The plan assets of the FirstMerit Pension Plan and the Citizens Pension Plan were combined and invested in a single trust as of December 31, 2013. Benefits remain frozen in the combined plan with the unique benefit structure under each of the FirstMerit and Citizens Pension Plans retained in the combined plan.
	A supplemental nonqualified, nonfunded pension plan for certain officers is also maintained and is being provided for by charges to earnings sufficient to meet the projected benefit obligation. The pension cost for this plan is based on substantially the same actuarial methods and economic assumptions as those used for the FirstMerit Pension Plan.
	Postretirement medical and life insurance plan. The Corporation also sponsored a benefit plan that provided postretirement medical and life insurance for retired employees ("FirstMerit Postretirement Plan"). The Corporation's medical contribution was limited to 200% of the 1993 level for employees who retire after January 1, 1993.
	Effective March 1, 2009, the Corporation discontinued the subsidy for retiree medical for current eligible active employees. Eligible employees who retired on or prior to March 1, 2009, were offered subsidized retiree medical coverage until age 65. Employees who retired after March 1, 2009 do not receive a Corporation subsidy toward retiree medical coverage.
	Postretirement medical and life insurance plans were also maintained for certain former Citizens employees after the Acquisition Date through December 31, 2013 ("Citizens Postretirement Plan"). Citizens’ Postretirement Plan provided postretirement health and dental care to full-time employees who retired with eligibility for coverage based on historical plan terms.
	As of December 31, 2013, the Corporation adopted one postretirement plan covering all eligible FirstMerit and former Citizens employees, with the FirstMerit Postretirement Plan being the surviving plan. The Citizens Postretirement Plan ceased to exist after December 31, 2013 and future benefits to the existing participants of the Citizens Postretirement Plan Plan will be provided under the FirstMerit Postretirement Plan. The Corporation reserves the right to terminate or amend the FirstMerit Postretirement Plan at any time.
	Other employee benefits. FirstMerit's Amended and Restated Executive Deferred Compensation Plan ("FirstMerit Deferred Compensation Plan") allows participating executives to elect to receive incentive compensation payable with respect to any year in whole Common Stock or cash, to elect to defer receipt of any incentive compensation otherwise payable with respect to any year in increments of 1%. An account is maintained in the name of each participant and is credited with cash or Common Stock equal to the number of shares that could have been purchased with the amount of any compensation so deferred, at the closing price of the Common Stock on the day as of which the share account is so credited. On December 18, 2013, the FirstMerit Deferred Compensation Plan was amended to freeze the benefit payable to the Corporation's Chairman, President and Chief Executive Officer ("CEO") at the level of the benefit accrued by the CEO under the plan as of November 30, 2013. Subsequent increases or decreases in the CEO's compensation nor any changes in circumstances will cause any increase or decrease in the amount payable to the CEO under this plan. The deferred compensation liability at December 31, 2013 and 2012 was $19.2 million and $10.2 million, respectively, and is included in accrued taxes, expenses and other liabilities on the accompanying Consolidated Balance Sheet.
	Savings plans. The Corporation maintains a retirement savings plan under Section 401(k) of the Internal Revenue Code of 1986, as amended, covering substantially all full-time and part-time employees beginning in the quarter following three months of continuous employment ("FirstMerit 401(k) Plan"). Effective January 1, 2009, the Corporation suspended is matching contribution to the savings plan. Effective April 1, 2011, the Corporation reinstated its matching contribution at $.50 of each $1.00 up to 1% of employee's qualifying salary. Starting January 1, 2013, the employer's matching contribution to the FirstMerit 401(k) Plan increased to 100% on the first 3% and then 50% on the next 2% of the employee's qualifying salary. Contributions made by the Corporation to the FirstMerit 401(k) Plan were $4.4 million for 2013, $0.6 million in 2012 and $0.5 million in 2011. Matching contributions vest in accordance with plan specifications.
	From the Acquisition Date through the close of business December 31, 2013, eligible Citizens employees who were employed by the Corporation continued to be covered by an employee savings plan under Section 401(k) ("Citizens 401(k) Plan"). Contributions to the Citizens 401(k) Plan were matched 50% on the first 2% of salary deferred and 25% on the next 6% deferred. The Corporation contributed $1.1 million to the Citizens 401(k) Plan from Acquisition Date through December 31, 2013. The Citizens 401(k) Plan was merged with the FirstMerit 401(k) Plan as of close of business December 31, 2013. The plan terms of the merged plans are substantially the same as the FirstMerit 401(k) Plan.
	The Corporation maintained a qualified defined contribution plan known as Retirement Investment Plan through December 31, 2012. The Corporation made a $3.5 million and a $3.2 million contribution to the Retirement Investment Plan for the years ended December 31, 2012 and 2011, respectively. Effective with the termination of this plan as of January 1, 2013, the Corporation will provide, for a five-year period, a transition contribution equal to 3% of an employee's qualifying salary to all eligible plan participants that have earned 60 age-plus-service points, as of December 31, 2012. This transition contribution totaled $1.1 million for the year ended December 31, 2013.
	The combined components of net periodic pension and postretirement benefits and other amounts recognized in AOCI for the Corporation's pension and postretirement benefit plans as of December 31, 2013, 2012 and 2011 are as follows:
		Pension Benefits											Postretirement Benefits
		2013				2012				2011			2013			2012			2011
	Net periodic cost consists of:
	Service cost	$	2,339			$	7,194			$	6,123		$	99		$	77		$	54
	Interest cost	12,814				11,862				11,439			563			697			886
	Expected return on plan assets	(14,938		)		(12,136		)		(13,313		)	—			—			—
	Amortization of prior service cost/(credit)	469				388				394			(468		)	(468		)	—
	Amortization of actuarial (gain)/loss	4,693				10,371				7,120			268			288			114
	Settlement / curtailment income	(524		)		(142		)		—			—			—			—
	Net periodic cost (benefit)	4,852				17,537				11,763			462			594			1,054
	Other changes in plan assets and benefit obligations recognized in Other comprehensive income:
	Current year actuarial loss/(gain)	(47,417		)		1,281				38,403			(682		)	(57		)	(3,217		)
	Amortization of actuarial gain/(loss)	(4,169		)		(10,229		)		(7,120		)	(268		)	(288		)	(114		)
	Amortization of prior service (cost)/credit	(469		)		(388		)		(394		)	468			468			—
	Total recognized in AOCI	(52,054		)		(9,337		)		30,889			(482		)	123			(3,330		)
	Total recognized in net periodic cost and AOCI	$	(47,203	)		$	8,200			$	42,652		$	(20	)	$	717		$	(2,276	)
	A measurement date of December 31 is used for plan assets and benefit obligations. The following table sets forth a reconciliation of the changes in the projected benefit obligation for the Corporation's pension and postretirement benefit plans as of December 31, 2013 and 2012 as well as the change in plan assets for the Corporation's qualified pension plans:
		Pension Benefits								Postretirement Benefits
		2013				2012				2013			2012
	Accumulated benefit obligation, end of year	307,739				257,206
	Change in projected benefit obligation:
	Projected benefit obligation, beginning of year	$	259,428			$	243,640			$	14,771		$	16,250
	Citizens acquisition	85,483				—				2,062			—
	Service cost	2,339				7,194				99			77
	Interest cost	12,814				11,862				563			697
	Plan amendments	3,927				—				—			—
	Participant contributions	—				—				1,538			1,199
	Actuarial (gains)/losses and change in assumptions	(35,984		)		8,529				(682		)	(58		)
	Benefits paid	(19,172		)		(11,797		)		(2,808		)	(3,394		)
	Projected benefit obligation, end of year	$	308,834			$	259,428			$	15,544		$	14,771
	Change in plan assets, at fair value:
	Fair value of plan assets, beginning of year	$	174,385			$	153,605			$	—		$	—
	Citizens acquisition	68,304				—				—			—
	Actual return on plan assets	30,298				19,372				—			—
	Participant contributions	—				—				1,538			1,199
	Employer contributions	3,695				13,205				1,270			2,195
	Benefits paid	(19,172		)		(11,797		)		(2,808		)	(3,394		)
	Fair value of plan assets, end of year	$	257,510			$	174,385			$	—		$	—
	Funded status (a)	(51,324		)		(85,043		)		(15,544		)	(14,771		)
	Amounts recognized in AOCI before income taxes:
	Prior service cost (credit)	$	5,121			$	1,663			$	(3,858	)	$	(4,326	)
	Net actuarial loss	53,061				108,572				3,329			4,279
	Amount recognized in AOCI	$	58,182			$	110,235			$	(529	)	$	(47	)
	(a) The Corporation recognizes the underfunded status of the plans in accrued taxes, expenses and other liabilities on the Consolidated Balance Sheet.
	As indicated in the table above, the benefit obligation and accumulated benefit obligation for all of the Corporation's pension plans were in excess of the fair value of plan assets.
	Actuarial assumptions. The actuarial assumptions used to determine year end obligations for the Corporation's pension and postretirement plans were as follows:
	Weighted-average assumptions for year end obligations	2013			2012			2011
	Discount rate
	Qualified pensions	4.99	%		4.21	%		5.04	%
Nonqualified pensions	4.12	%		4.21	%		5.04	%
Postretirement medical benefits, FirstMerit's plan	4.01	%		3.18	%		4.23	%
Postretirement medical benefits, Citizens' plan	3.98	%		na			na
Postretirement life insurance benefits	5.08	%		4.3	%		5.03	%
Expected long-term rate of return	6.75	%		7	%		7.25	%
Rate of compensation increase
Qualified pensions	na			na			5.22	%
Nonqualified pensions	3.75	%		3.75	%		3.75	%
Assumed health care cost trend rate, pre-65 (a)
Initial trend	7.5	%		8	%		8.5	%
Ultimate trend	5	%		5	%		5	%
Year ultimate trend reached	2019			2019			2019
Assumed health care cost trend rate, post-65 (a)
Initial trend	11.5	%		12	%		12.5	%
Ultimate trend	5	%		5	%		5	%
Year ultimate trend reached	2027			2027			2027
Prescription Drugs
Initial trend	7.5	%		8	%		8.5	%
Ultimate trend	5	%		5	%		5	%
Year ultimate trend reached	2019			2019			2019
(a) The health care cost trend assumptions relate only to the postretirement benefit plans. Increasing or decreasing the assumed health care cost trend rates by one percentage point each future year would not have a material impact on total service and interest cost or the year end benefit obligation.
The actuarial assumptions used as of the beginning of the year to determine the net periodic costs for the Corporation's pension and postretirement plans were as follows:
Weighted-average assumptions for benefit cost at beginning of year	2013			2012			2011
Discount rate (a)
Qualified pension	4.21	%		5.04	%		5.6	%
Nonqualified pensions	4.21	%		5.04	%		5.6	%
Postretirement medical benefits	3.18	%		4.23	%		4.43	%
Postretirement life insurance benefits	4.3	%		5.03	%		5.53	%
Expected long-term rate of return (a)	7	%		7.25	%		8.25	%
Rate of compensation increase
Qualified pension	na			5.22	%		5.22	%
Nonqualified pensions	3.75	%		3.75	%		3.75	%
Assumed health care cost trend rate, pre-65 (b)
Initial trend	8	%		8.5	%		9	%
Ultimate trend	5	%		5	%		5	%
Year ultimate trend reached	2019			2019			2019
Assumed health care cost trend rate, post-65 (b)
Initial trend	12	%		12.5	%		13	%
Ultimate trend	5	%		5	%		5	%
Year ultimate trend reached	2027			2027			2027
Prescription Drugs
Initial trend	8	%		8.5	%		9	%
Ultimate trend	5	%		5	%		5	%
Year ultimate trend reached	2019			2019			2019
(a) The Citizens Pension and Postretirement Plans were remeasured at the Acquisition Date based on discount rate of 3.83% and an expected long-term rate of return of 6.75%.
(b) The health care cost trend assumptions relate only to the postretirement benefit plans. Increasing or decreasing the assumed health care cost trend rates by one percentage point each future year would not have a material impact on total service and interest cost or the year end benefit obligation
The discount rates are determined independently for each plan and reflect the market rate for high-quality fixed income debt instruments, that is rated double-A or higher by a recognized ratings agency.
The rate of return on plan assets is a long-term assumption established by considering historic plan asset returns and anticipated returns of the asset classes invested in by the pension plan and the allocation strategy currently in place among those classes. The expected return on equities was computed using a valuation framework, which projected future returns based on current equity valuations rather than historical returns. Due to active management of the plan’s assets, the return on the plan equity investments historically has exceeded market averages. Management estimated the rate by which the plan assets would outperform the market in the future based on historical experience adjusted for changes in asset allocation and expectations for overall future returns on equities compared to past periods.
The Medicare Prescription Drug, Improvement and Modernization Act of 2003 introduced a prescription drug benefit under Medicare, and provides a federal subsidy to sponsors of retiree healthcare benefit plans that offer "actuarially equivalent" prescription drug coverage to retirees. For the years ended December 31, 2013, 2012 and 2011, these subsidies did not have a material effect on our APBO and net postretirement benefit cost for the Corporation.
Net unrecognized actuarial gains or losses and prior service costs are recognized as an adjustment to accumulated other comprehensive income, net of tax, in the period they arise and, subsequently, recognized as a component of net periodic benefit cost over the average remaining service period of the active employees. The amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost (credit) during the next fiscal year are as follows:
	Pension				Postretirement				Total
Prior service cost	$	2,534			$	(468	)		$	2,066
Cumulative net loss	1,995				235				2,230
At December 31, 2013 the FirstMerit Pension Plan was sufficiently funded under the requirements of ERISA. Consequently, the Corporation is not required to make a minimum contribution to that plan in 2014. The Corporation also does not expect to make any significant discretionary contributions during 2014. The Corporation made discretionary contributions of $10.0 million to the FirstMerit Pension Plan in both 2012 and 2011.
At December 31, 2013, the projected benefit payments for the Corporation's pension and postretirement plans, which reflect expected future service as appropriate, totaled $28.2 million and $1.6 million in 2014, $22.9 million and $1.5 million in 2015, $22.6 million and $1.3 million in 2016, $20.4 million and $1.3 million in 2017, $20.5 million and $1.2 million in 2018, and $92.6 million and $5.1 million in years 2019 through 2022, respectively. The projected payments were calculated using the same assumptions as those used to calculate the benefit obligations in the preceding tables.
FirstMerit Pension Plan Investment Policy and Strategy. The FirstMerit Pension Plan invests in equities and other return-seeking assets such as real assets, as well as liability-hedging assets, primarily fixed income.  The Investment Policy recognizes that the plan's asset return requirements and risk tolerances will change over time.  The Corporation utilizes a dynamic investment policy, whereby the allocation to return-seeking assets and liability-hedging assets is determined by comparing plan assets to the plan liabilities. As the plan's funded ratio status improves, the allocation to liability-hedging assets will increase.
Dynamic Investment Policy Schedule
Return-Seeking (and Diversification) Allocation Strategy
Funded Ratio	Minimum	Target	Maximum
≤80%	58%	65%	72%
81%-83%	55%	62%	69%
84%-86%	52%	58%	64%
87%-89%	47%	53%	59%
90%-92%	43%	49%	55%
93%-95%	39%	44%	49%
96%-98%	35%	40%	45%
99%-101%	31%	35%	39%
102%-104%	27%	31%	35%
105%-107%	22%	26%	30%
107%-110%	18%	22%	26%
>110%	16%	20%	24%
Citizens Pension Plan Investment Policy and Strategy. The Citizens Pension Plan investment policy and strategy for managing defined benefit plan assets was described as growth with income. Management analyzed the potential risks and rewards associated with the asset allocation strategies on a quarterly basis. Implementation of the strategies included regular rebalancing to the target asset allocation. The target asset allocation mix remained at 60% equities and 40% fixed income debt securities and cash equivalents during 2013. The long-term rate of return expected on plan assets was finalized after considering long-term returns in the general market, long-term returns experienced by the assets in the plan, and projected plan expenses.
The weighted-average allocations for the combined FirstMerit and Citizens Pension Plans as of December 31, 2013 and the FirstMerit Pension Plan for December 31, 2012, by asset category, are as follows:
		Percentage of
		Plan Assets on
		Measurement Date
		December 31,
Asset Category		2013			2012
Cash and domestic money market funds		1.92	%		2.97	%
U.S. Treasury obligations		1.76	%		2.34	%
U.S. Government agencies		0.96	%		2.03	%
Corporate bonds		3.12	%		4.55	%
Common stocks		11.24	%		15.43	%
Equity mutual funds		27.62	%		31.35	%
Fixed income mutual funds		36.56	%		24.1	%
Foreign mutual funds		16.83	%		17.23	%
		100	%		100	%
The following is a description of the valuation methodologies used to measure assets held by the FirstMerit Pension Plans at fair value.
•	Domestic and foreign money market funds: Valued at quoted prices as reported on the active market in which the money market funds are traded.
•	United States government securities, United States government agency issues and corporate bonds: Valued using independent evaluated prices which are based on observable inputs, such as available trade information, spreads, bids and offers, and United States Treasury curves.
•	Common stocks: Valued at the closing price reported on the active market in which the individual securities are traded.
•	Registered equity, fixed income and foreign mutual funds: Valued at quoted prices as reported on the active market in which the securities are traded.
The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Corporation believes its valuation method is appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of financial instruments could result in a different fair value measurement at the reporting date.
The following table sets forth by level, within the fair value hierarchy, the FirstMerit Pension Plan's assets at fair value as of December 31, 2013:
	Level 1				Level 2				Level 3			Total
Domestic money market funds	$	4,948			$	—			$	—		$	4,948
United States government securities	—				4,544				—			4,544
United States government agency issues	—				2,461				—			2,461
Corporate bonds	—				8,024				—			8,024
Common stocks	28,951				—				—			28,951
Equity mutual funds	71,118				—				—			71,118
Fixed income mutual funds	94,135				—				—			94,135
Foreign mutual funds	43,330				—				—			43,330
Total assets at fair value	$	242,481			$	15,029			$	—		$	257,510

ShareBased_Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]	'
Share-Based Compensation	'
	Share-Based Compensation
	The Corporation's 2002, 2006 and 2011 Stock and Equity Plans, and the Citizens Republic Bancorp, Inc. Stock Compensation plan, and the Republic Bancorp, Inc 1998 Stock Option Plan that were assumed by the Corporation in connection with the Citizens acquisition (the "Plans"), provide stock options and restricted stock awards to employees for up to 7,883,646 Common Stock of the Corporation. The Plans also provide for the granting of nonqualified stock options and nonvested (restricted) shares to certain nonemployee directors of the Corporation. Outstanding options under these Plans are generally not exercisable for twelve months from date of grant. The total share-based compensation expense recognized during the years ended December 31, 2013, 2012 and 2011 was $10.9 million, $9.3 million and $8.0 million, respectively, and the related tax benefit thereto was $3.8 million, $3.3 million and $2.8 million, respectively. Share-based compensation expense related to awards granted to employees as well as awards granted to directors is recorded in salaries, wages, pension and employee benefits in the accompanying Consolidated Statements of Income.
	Certain of the Corporation's share-based award grants contain terms that provide for a graded vesting schedule whereby portions of the award vest in increments over the requisite service period. The Corporation has elected to recognize compensation expense for awards with graded vesting schedule on a straight-line basis over the requisite service period for the entire award. Compensation expense is recognized based on the estimated number of stock options and awards for which service is to be rendered. Upon stock option exercise or stock unit conversion, it is the policy of the Corporation to issue shares from treasury stock.
	In accordance with the Corporation's stock option and nonvested (restricted) shares plans, employee participants that are 55 or older and have 15 years of service are eligible to retire. Prior to the Plans' amendments during 2007, which eliminated post retirement vesting, all unvested awards at the time of retirement continued to vest. The Corporation accelerates the recognition of compensation costs for share-based awards granted to retirement-eligible employees prior and employees who become retirement-eligible is granted or modified, the compensation cost of these awards is recognized over the period up to the date the employee first becomes eligible to retire.
	Stock Option Awards
	Options under these Plans are granted with an exercise price equal to the market price of the Corporation's shares at the date of grant; those option awards generally vest based on three years of continuous service and have a 10-year contractual term. Options granted as incentive stock options must be exercised within ten years and options granted as nonqualified stock options have terms established by the Compensation Committee of the Board and approved by the nonemployee directors of the Board. Upon termination, options are cancelable within defined periods based upon the reason for termination of employment.
	The Black-Scholes option pricing model was used to estimate the fair market value of the options at the date of grant. This model was originally developed for use in estimating the fair value of traded options which have different characteristics from the Corporation's employee stock options. Because of these differences, the Black-Scholes model is not a perfect indicator of value of an employee stock option, but it is commonly used for this purpose.
	A summary of stock option activity under the Plans as of December 31, 2013, 2012 and 2011 and changes during the years then ended is as follows:
	Options	Shares (000's)		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate InstrinsicValue (000's)
	Outstanding at January 1, 2011	4,292		$	25.29	2.01	70
	Exercised	—		—
	Forfeited	—		—
	Expired	(2,215	)	25.55
	Outstanding at December 31, 2011	2,077		$	25.15	1.85	$	—
	Exercised	—		—
	Forfeited	(71	)	25.85
	Expired	(186	)	25.97
	Outstanding at December 31, 2012	1,820		$	24.73	1.82	$	—
	Acquired	63		218.01
	Exercised	—		—
	Forfeited	(8	)	23.93
	Expired	(479	)	36.64
	Outstanding at December 31, 2013	1,396		$	28.84	1.14	$	87
	Exercisable at December 31, 2013	1,396		$	28.84	1.14	$	87
	There were no options granted in the years ended December 31, 2013, 2012 and 2011. During the years ended December 31, 2013, 2012 and 2011, no options were exercised.
	The Corporation has a policy of repurchasing shares on the open market to satisfy share option exercises. The Corporation repurchased 2.6 million shares of Common Stock in the first quarter of 2006, which has been adequate to cover all options exercised to date.
	At December 31, 2013, there was no unrecognized compensation costs related to stock options granted to be realized under the Plans.
	Nonvested Stock Awards
	The market price of the Corporation's Common Stock at the date of grant is used to estimate the fair value of nonvested (restricted) stock awards. A summary of the status of the Corporation's nonvested shares as of December 31, 2013, 2012 and 2011 and changes during the years then ended, is as follows:
				Weighted-Average
				Grant Date
	Nonvested (restricted) Shares	Shares (000's)		Fair Value
	Nonvested at January 1, 2011	871		$	20.17
	Granted	585		16.48
	Vested	(407	)	19.75
	Forfeited or expired	(23	)	19.21
	Nonvested at December 31, 2011	1,026		$	18.26
	Granted	596		16.06
	Vested	(493	)	18.29
	Forfeited or expired	(50	)	18.94
	Nonvested at December 31, 2012	1,079		$	17
	Granted	823		16.47
	Vested	(508	)	17.9
	Forfeited or expired	(52	)	16.89
	Nonvested at December 31, 2013	1,342		$	16.34
	At December 31, 2013, there was $13.3 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plans. That cost is expected to be recognized over a weighted-average period of 1.7 years. The total fair value of shares vested during the year ended December 31, 2013, 2012 and 2011 was $9.1 million, $9.0 million and $7.2 million, respectively.

Parent_Company

Parent Company	12 Months Ended
	Dec. 31, 2013
Parent Company [Abstract]	'
Parent Company	'
	Condensed financial information of FirstMerit Corporation (Parent Company only) is as follows:
				As of December 31,
	Condensed Balance Sheet			2013				2012
		Assets:
			Cash and due from banks	$	125,032			$	140,939
			Investment securities	2,253				1,429
			Investment in subsidiaries, at equity in underlying value of their net assets	2,863,473				1,490,718
			Other assets	77,674				13,973
			Total Assets	$	3,068,432			$	1,647,059
		Liabilities and Shareholders' Equity:
			Long-term debt	$	324,428			$	—
			Accrued and other liabilities	41,110				1,857
			Shareholders' equity	2,702,894				1,645,202
			Total Liabilities and Shareholders' Equity	$	3,068,432			$	1,647,059
				Year Ended December 31,
	Condensed Statement of Income			2013				2012				2011
		Income:
			Cash dividends from subsidiaries	$	81,715			$	155,493			$	72,500
			Noninterest income	483				309				287
			Total income	82,198				155,802				72,787
		Interest and other expenses		29,684				10,799				8,005
		Income before income tax benefit and equity in undistributed income of subsidiaries		52,514				145,003				64,782
		Income tax benefit		(9,341		)		(2,004		)		(1,803		)
			Income before equity in undistributed net income of subsidiaries	61,855				147,007				66,585
		Equity in undistributed income of subsidiaries		121,829				(12,901		)		52,973
		Net income		$	183,684			$	134,106			$	119,558
					Year Ended December 31,
	Condensed Statement of Cash Flows				2013				2012				2011
	Operating activities:
			Net income		$	183,684			$	134,106			$	119,558
			Adjustments to reconcile net income to net cash provided by operating activities
			Equity in undistributed income of subsidiaries		(121,829		)		12,901				(52,973		)
			Decrease in Federal income tax receivable		(30,399		)		(4,446		)		(936		)
			Increase in deferred Federal income tax payable		27,032				106				13
			Increase in interest payable		4,618				—				—
			Other		924				738				558
			Net cash provided by operating activities		64,030				143,405				66,220
	Investing activities:
			Loans or advances to subsidiaries		(50		)		—				(18,704		)
			Repayment of loans to subsidiaries		—				—				76,030
			Cash paid for acquisition, net of cash received		(315,069		)		—				—
			Sale of investments in subsidiaries		—				7,827				—
			Purchases of investment securities		(215		)		(44		)		(45		)
			Net cash (used) provided by investing activities		(315,334		)		7,783				57,281
	Financing activities:
			Proceeds from issuance of subordinated debt		249,927				—				—
			Proceeds from issuance of preferred stock		96,550				—				—
			Cash dividends-common stock		(96,222		)		(69,459		)		(69,255		)
			Cash dividends-preferred stock		(5,337		)		—				—
			Purchase of treasury shares		(9,521		)		(2,389		)		(2,295		)
			Net cash provided (used) by financing activities		235,397				(71,848		)		(71,550		)
	(Decrease) increase in cash and cash equivalents				(15,907		)		79,340				51,951
	Cash and cash equivalents at beginning of year				140,939				61,599				9,648
	Cash and cash equivalents at end of year				$	125,032			$	140,939			$	61,599

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	Management monitors the Corporation’s results by an internal performance measurement system, which provides lines of business results and key performance measures. The profitability measurement system is based on internal financial management practices designed to produce consistent results and reflect the underlying economics of the businesses. The development and application of these methodologies is a dynamic process. Accordingly, these measurement tools and assumptions may be revised periodically to reflect methodological, product, and/or management organizational changes. Further, these tools measure financial results that support the strategic objectives and internal organizational structure of the Corporation. Consequently, the information presented is not necessarily comparable with similar information for other financial institutions.
	A description of each business, selected financial performance, and the methodologies used to measure financial performance are presented below.
	•	Commercial – The commercial line of business provides a full range of lending, depository, and related financial services to middle-market corporate, industrial, financial, core business banking, public entities, and leasing clients. Commercial also includes personal business from commercial loan clients in coordination with the Wealth Management segment. Products and services offered include commercial term loans, revolving credit arrangements, asset-based lending, leasing, commercial mortgages, real estate construction lending, letters of credit, treasury management, government banking, international banking, merchant card and other depository products and services.
	•	Retail – The retail line of business includes consumer lending and deposit gathering, residential mortgage loan origination and servicing, and branch-based small business banking (formerly known as the "micro business" line). Retail offers a variety of retail financial products and services including consumer direct and indirect installment loans, debit and credit cards, debit gift cards, residential mortgage loans, home equity loans and lines of credit, deposit products, fixed and variable annuities and ATM network services. Deposit products include checking, savings, money market accounts and certificates of deposit.
	•	Wealth – The wealth line of business offers a broad array of asset management, private banking, financial planning, estate settlement and administration, credit and deposit products and services. Trust and investment services include personal trust and planning, investment management, estate settlement and administration services. Retirement plan services focus on investment management and fiduciary activities. Brokerage and insurance delivers retail mutual funds, other securities, variable and fixed annuities, personal disability and life insurance products and brokerage services. Private banking provides credit, deposit and asset management solutions for affluent clients.
	•	Other – The other line of business includes activities that are not directly attributable to one of the three principal lines of business. Included in the Other category are the parent company, eliminations companies, community development operations, the treasury group, which includes the securities portfolio, wholesale funding and asset liability management activities, and the economic impact of certain assets, capital and support functions not specifically identifiable with the three primary lines of business.
	The accounting policies of the lines of businesses are the same as those of the Corporation described in Note 1 (Summary of Significant Accounting Policies). Funds transfer pricing is used in the determination of net interest income by assigning a cost for funds used or credit for funds provided to assets and liabilities within each business unit. Assets and liabilities are match-funded based on their maturity, prepayment and/or repricing characteristics. As a result, the three primary lines of business are generally insulated from changes in interest rates. Changes in net interest income due to changes in rates are reported in Other by the treasury group. Capital has been allocated on an economic risk basis. Loans and lines of credit have been allocated capital based upon their respective credit risk. Asset management holdings in the Wealth segment have been allocated capital based upon their respective market risk related to assets under management. Normal business operating risk has been allocated to each line of business by the level of noninterest expense. Mismatch between asset and liability cash flow as well as interest rate risk for mortgage servicing rights and the origination business franchise value have been allocated capital based upon their respective asset/liability management risk. The provision for loan loss is allocated based upon the actual net charge-offs of each respective line of business, adjusted for loan growth and changes in risk profile. Noninterest income and expenses directly attributable to a line of business are assigned to that line of business. Expenses for centrally provided services are allocated to the business line by various activity based cost formulas.
	Substantially all of the Corporation’s business is conducted in the United States of America. The following tables present a summary of financial results as of and for the years ended December 31, 2013, 2012 and 2011:
																FirstMerit
	December 31, 2013	Commercial			Retail			Wealth				Other				Consolidated
	OPERATIONS:
	Net interest income	$	386,768		$	322,942		$	14,902			$	(13,827	)		$	710,785
	Provision for loan losses	17,072			16,151			(692		)		1,153				33,684
	Noninterest income	83,933			114,679			48,289				23,442				270,343
	Noninterest expense	209,936			330,875			54,196				92,327				687,334
	Net income	158,400			58,886			6,296				(39,898		)		183,684
	AVERAGES:
	Assets	8,397,357			4,746,277			259,601				8,086,540				21,489,775
	Loans	8,292,805			4,367,701			226,152				62,008				12,948,666
	Earnings assets	8,480,005			4,392,937			226,179				5,393,874				18,492,995
	Deposits	5,572,287			10,749,725			826,794				152,782				17,301,588
	Economic Capital	602,561			256,362			72,244				1,477,698				2,408,865
																	FirstMerit
	December 31, 2012		Commercial			Retail			Wealth				Other				Consolidated
	OPERATIONS:
	Net interest income		$	258,575		$	207,907		$	17,444			$	(12,096	)		$	471,830
	Provision for loan losses		32,319			10,008			(626		)		12,997				54,698
	Noninterest income		67,606			103,279			32,996				19,723				223,604
	Noninterest expense		159,525			221,297			39,296				33,495				453,613
	Net income		87,318			51,922			7,650				(12,784		)		134,106
	AVERAGES:
	Assets		6,424,226			2,952,280			238,805				5,005,316				14,620,627
	Loans		6,391,189			2,674,997			225,018				65,876				9,357,080
	Earnings assets		6,493,713			2,707,632			225,044				3,646,302				13,072,691
	Deposits		3,284,722			7,416,982			709,786				142,308				11,553,798
	Economic Capital		404,005			212,409			49,313				942,381				1,608,108
																	FirstMerit
	December 31, 2011		Commercial			Retail			Wealth				Other				Consolidated
	OPERATIONS:
	Net interest income		$	265,196		$	225,580		$	18,764			$	(29,913	)		$	479,627
	Provision for loan losses		38,830			21,672			3,479				10,407				74,388
	Noninterest income		57,940			103,248			31,684				31,885				224,757
	Noninterest expense		148,338			235,339			40,004				40,664				464,345
	Net income		88,379			46,681			4,527				(20,029		)		119,558
	AVERAGES:
	Assets		6,203,526			2,935,699			240,952				5,115,153				14,495,330
	Loans		6,201,990			2,661,910			227,710				64,363				9,155,973
	Earnings assets		6,281,589			2,712,133			228,191				3,506,811				12,728,724
	Deposits		3,027,329			7,500,213			644,879				240,080				11,412,501
	Economic Capital		368,434			223,772			50,871				905,276				1,548,353

Fair_Value_Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	Fair Value Measurement
	As defined in ASC 820, Fair Value Measurements and Disclosures, fair value is defined as the price to sell an asset or transfer a liability in an orderly transaction between market participants in the principal market or most advantageous market for the asset or liability. Fair value is based on quoted market prices, when available, for identical or similar assets or liabilities. In the absence of quoted market prices, Management determines the fair value of the Corporation's assets and liabilities using valuation models or third-party pricing services. Both of these approaches rely on market-based parameters when available, such as interest rate yield curves, option volatilities and credit spreads, or unobservable inputs. Unobservable inputs may be based on Management's judgment, assumptions and estimates related to credit quality, liquidity, interest rates and other relevant inputs.
	GAAP establishes a three-level valuation hierarchy for determining fair value that is based on the transparency of the inputs used in the valuation process. The inputs used in determining fair value in each of the three levels of the hierarchy, highest ranking to lowest, are as follow:
	•	Level 1 — Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.
	•	Level 2 — Significant other observable inputs other than Level 1 prices such quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
	•	Level 3 — Significant unobservable inputs that reflect a company's own assumptions about the assumptions that market participants would use in pricing an asset or liability.
	The level in the fair value hierarchy ascribed to a fair value measurement in its entirety is based on the lowest level input that is significant to the overall fair value measurement.
	Valuation adjustments, such as those pertaining to counterparty and the Corporation's own credit quality and liquidity, may be necessary to ensure that assets and liabilities are recorded at fair value.  Credit valuation adjustments are made when market pricing does not accurately reflect the counterparty's credit quality.  As determined by Management, liquidity valuation adjustments may be made to the fair value of certain assets to reflect the uncertainty in the pricing and trading of the instruments when Management is unable to observe recent market transactions for identical or similar instruments. Liquidity valuation adjustments are based on the following factors:
	•	the amount of time since the last relevant valuation;
	•	whether there is an actual trade or relevant external quote available at the measurement date; and
	•	volatility associated with the primary pricing components.
	Management ensures that fair value measurements are accurate and appropriate by relying upon various controls, including:
	•	an independent review and approval of valuation models;
	•	recurring detailed reviews of profit and loss; and
	•	a validation of valuation model components against benchmark data and similar products, where possible.
	Management reviews any changes to its valuation methodologies to ensure they are appropriate and justified, and refines valuation methodologies as more market-based data becomes available.  Transfers between levels of the fair value hierarchy are recognized at the end of the reporting period.
	Additional information regarding the Corporation's accounting policies for determining fair value is provided in Note 1 (Summary of Significant Accounting Policies) under the heading "Fair Value Measurements."
	The following tables present the balance of assets and liabilities measured at fair value on a recurring and nonrecurring basis at December 31, 2013 and 2012:
					Fair Value by Hierarchy
		31-Dec-13			Level 1			Level 2			Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	3,036		$	3,036		$	—		$	—
	Nonmarketable equity securities	3,281			—			10			3,271
	U.S. States and political subdivisions	262,367			—			262,367			—
	Residential mortgage-backed securities:
	U.S. government agencies	969,922			—			969,922			—
	Commercial mortgage-backed securities:
	U.S. government agencies	69,567			—			69,567			—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,518,393			—			1,518,393			—
	Nonagency	9			—			—			9
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	102,268			—			102,268			—
	Corporate debt securities	50,644			—			—			50,644
	Asset-backed securities:
	Collateralized loan obligations, nonagency issued	293,687			—			—			293,687
	Total available-for-sale securities	3,273,174			3,036			2,922,527			347,611
	Residential loans held for sale	11,622			—			11,622			—
	Derivative assets:
	Interest rate swaps - nondesignated	46,577			—			46,577			—
	Mortgage loan commitments	891			—			891			—
	Forward sale contracts	384			—			384			—
	Foreign exchange	50			—			50			—
	Total derivative assets	47,902			—			47,902			—
	Total fair value of assets (a)	$	3,332,698		$	3,036		$	2,982,051		$	347,611
	Derivative liabilities:
	Interest rate swaps - fair value hedges	11,574			—			11,574			—
	Interest rate swaps - nondesignated	46,577			—			46,577			—
	Foreign exchange	50			—			50			—
	Total derivative liabilities	58,201			—			58,201			—
	True-up liability	11,463			—			—			11,463
	Total fair value of liabilities (a)	$	69,664		$	—		$	58,201		$	11,463
	Nonrecurring fair value measurement
	Mortgage servicing rights (b)	$	23,041		$	—		$	—		$	23,041
	Impaired loans (c)	47,870			—			—			47,870
	Other property (d)	10,018			—			—			10,018
	Other real estate covered by loss share (e)	8,754			—			—			8,754
	Total fair value	$	89,683		$	—		$	—		$	89,683
	(a) - There were no transfers between levels 1, 2, or 3 of the fair value hierarchy during the year ended December 31, 2013.
	(b) - MSRs with a recorded investment of $22.8 million were reduced by a specific valuation allowance totaling $0.3 million to a reported carrying value of $22.5 million resulting in a recovery of previously recognized expense of $2.3 million included in loans sales and servicing income in the year ended December 31, 2013.
	(c) - Collateral dependent impaired loans with a recorded investment of $52.6 million were reduced by specific valuation allowance allocations totaling $4.8 million to a reported net carrying value of $47.9 million.
	(d) - Amounts do not include assets held at cost at December 31, 2013. During the year ended December 31, 2013, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $1.4 million included in noninterest expense.
(e) - Amounts do not include assets held at cost at December 31, 2013. During the year ended December 31, 2013, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses $1.0 million included in noninterest expense.
				Fair Value by Hierarchy
	31-Dec-12			Level 1			Level 2			Level 3
Recurring fair value measurement
Available-for-sale securities:
Marketable equity securities	$	3,241		$	3,241		$	—		$	—
U.S. States and political subdivisions	268,204			—			268,204			—
Residential mortgage-backed securities:
U.S. government agencies	1,107,063			—			1,107,063			—
Commercial mortgage-backed securities:
U.S. government agencies	52,036			—			52,036			—
Residential collateralized mortgage-backed securities:
U.S. government agencies	1,329,421			—			1,329,421			—
Nonagency	11			—			2			9
Commercial collateralized mortgage-backed securities:
U.S. government agencies	111,343			—			111,343			—
Corporate debt securities	49,652			—			—			49,652
Total available-for-sale securities	2,920,971			3,241			2,868,069			49,661
Residential loans held for sale	23,683			—			23,683			—
Derivative assets:
Interest rate swaps - nondesignated	58,769			—			58,769			—
Mortgage loan commitments	4,400			—			4,400			—
Foreign exchange	62			—			62			—
Total derivative assets	63,231			—			63,231			—
Total fair value of assets (a)	$	3,007,885		$	3,241		$	2,954,983		$	49,661
Derivative liabilities:
Interest rate swaps - fair value hedges	19,080			—			19,080			—
Interest rate swaps - nondesignated	58,769			—			58,769			—
Forward sale contracts	62			—			62			—
Foreign exchange	57			—			57			—
Total derivative liabilities	77,968			—			77,968			—
True-up liability	12,259			—			—			12,259
Total fair value of liabilities (a)	$	90,227		$	—		$	77,968		$	12,259
Nonrecurring fair value measurement
Mortgage servicing rights (b)	$	18,833		$	—		$	—		$	18,833
Impaired loans (c)	54,491			—			—			54,491
Other property (d)	7,540			—			—			7,540
Other real estate covered by loss share (e)	12,631			—			—			12,631
Total fair value	$	93,495		$	—		$	—		$	93,495
(a) - There were no transfers between levels 1,2, or 3 of the fair value hierarchy during the year ended December 31, 2012.
(b) - MSRs with a recorded investment of $21.3 million were reduced by a specific valuation allowance totaling $2.6 million to a reported carrying value of $18.8 million resulting in the recovery of previously recognized expense of $1.0 million included in loan sales and servicing income in the year ended December 31, 2012.
(c) - Collateral dependent impaired loans with a recorded investment of $57.8 million were reduced by specific valuation allowance allocations totaling $3.3 million to a reported net carrying value of $54.5 million.
(d) Amounts do not include assets held at cost at December 31, 2012. During the year ended December 31, 2012, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $2.2 million included in noninterest expense.
(e) Amounts do not include assets held at cost at December 31, 2012. During the year ended December 31, 2012, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $1.7 million included in noninterest expense.
The following section describes the valuation methodologies used by the Corporation to measure financial assets and liabilities at fair value. During years ended December 31, 2013 and 2012, there were no significant changes to the valuation techniques used by the Corporation to measure fair value.
Available-for-sale securities. When quoted prices are available in an active market, securities are valued using the quoted price and are classified as Level 1. The quoted prices are not adjusted. Level 1 instruments include money market mutual funds.
Securities are classified as Level 2 if quoted prices for identical securities are not available, and fair value is determined using pricing models by a third-party pricing service.   Approximately 89% of the available-for-sale portfolio is Level 2. For the majority of available-for sale securities, the Corporation obtains fair value measurements from an independent third party pricing service. These instruments include: municipal bonds; bonds backed by the U.S. government; corporate bonds; MBS; securities issued by the U.S. Treasury; and certain agency and corporate CMO.  The independent pricing service uses industry-standard models to price U.S. Government agencies and MBS that consider various assumptions, including time value, yield curves, volatility factors, prepayment speeds, default rates, loss severity, current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Obligations of state and political subdivisions are valued using a matrix, or grid, pricing in which securities are benchmarked against the treasury rate based on credit rating. For collateralized mortgage securities, depending on the characteristics of a given tranche, a volatility driven multidimensional static model or Option-Adjusted Spread model is generally used. Substantially all assumptions used by the independent pricing service for securities classified as Level 2 are observable in the marketplace, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace.
Securities are classified as Level 3 when there is limited activity in the market for a particular instrument and fair value is determined by obtaining broker quotes. As of December 31, 2013, approximately 11% of the available-for-sale portfolio is Level 3, which consists of single issuer trust preferred securities and CLOs.
The single issuer trust preferred securities are measured at unadjusted prices obtained from the independent pricing service. The independent pricing service prices these instruments through a broker quote when sufficient information, such as cash flows or other security structure or market information, is not available to produce an evaluation. Broker-quoted securities are adjusted by the independent pricing service based solely on the receipt of updated quotes from market makers or broker-dealers recognized as market participants. A list of such issues is compiled by the independent pricing service daily. For broker-quoted issues, the independent pricing service applies a zero spread relationship to the bid-side valuation, resulting in the same values for the mean and ask.
CLOs are securitized products where payments from multiple middle sized and large business loans are pooled together and segregated into different classes of bonds with payments on these bonds based on their priority within the overall deal structure. The markets for such securities are generally characterized by low trading volumes and wide bid-ask spreads, all driven by more limited market participants. Although estimated prices are generally obtained for such securities, the level of market observable assumptions used is limited in the valuation. Specifically, market assumptions regarding credit adjusted cash flows and liquidity influences on discount rates were difficult to observe at the individual bond level. Accordingly, the securities are currently valued by a third party that primarily utilizes dealer or pricing service prices and, subsequently, verifies this pricing through a disciplined process to ensure proper valuations and to highlight differences in cash flow modeling or other risks to determine if the market perception of the risk of a CLO is beginning to deviate from other similar tranches.  This is done by establishing ranges for appropriate pricing yields for each CLO tranche and, using a standardized cash flow scenario, ensuring yields are consistent with expectations.
On a monthly basis, Management validates the pricing methodologies utilized by our independent pricing service to ensure the fair value determination is consistent with the applicable accounting guidance and that the investments are properly classified in the fair value hierarchy. Management substantiates the fair values determined for a sample of securities held in portfolio by reviewing the key assumptions used by the independent pricing service to value the securities and comparing the fair values to prices from other independent sources for the same and similar securities. Management analyzes variances and conducts additional research with the independent pricing service, if necessary, and takes appropriate action based on its findings.
Loans held for sale. These loans are regularly traded in active markets through programs offered by FHLMC and FNMA, and observable pricing information is available from market participants. The prices are adjusted as necessary to include any embedded servicing value in the loans and to take into consideration the specific characteristics of certain loans. These adjustments represent unobservable inputs to the valuation but are not considered significant to the fair value of the loans. Accordingly, residential real estate loans held for sale are classified as Level 2.
Impaired loans. Certain impaired collateral dependent loans are reported at fair value less costs to sell the collateral. Collateral values are estimated using Level 3 inputs, consisting of third-party appraisals or price opinions and internal adjustments necessary in the judgment of Management to reflect current market conditions and current operating results for the specific collateral. Collateral may be in the form of real estate or personal property including equipment and inventory. The vast majority of the collateral is real estate. When impaired collateral dependent loans are individually re-measured and reported at fair value of the collateral, less costs to sell, a direct loan charge off to the ALLL and/or a specific valuation allowance allocation is recorded.
Other Property. Certain other property which consists of foreclosed assets and properties securing residential and commercial loans, upon initial recognition and transfer from loans, are re-measured and reported at fair value less costs to sell to the property through a charge-off to the ALLL based on the fair value of the foreclosed assets. The fair value of a foreclosed asset, upon initial recognition, is estimated using Level 3 inputs, consisting of third party appraisals or price opinions and internal adjustments necessary in the judgment of Management to reflect current market conditions and current operating results for the specific collateral. Subsequent to foreclosure, valuations are updated periodically, and the assets may be written down further through a charge to noninterest expense.
Mortgage Servicing Rights. The Corporation carries its mortgage servicing rights at lower of cost or fair value, and, therefore, they subject to fair value measurements on a nonrecurring basis. Since sales of mortgage servicing rights tend to occur in private transactions and the precise terms and conditions of the sales are typically not readily available, there is a limited market to refer to in determining the fair value of mortgage servicing rights. As such, like other participants in the mortgage banking business, the Corporation relies primarily on a discounted cash flow model, incorporating assumptions about loan prepayment rates, discount rates, servicing costs and other economic factors, to estimate the fair value of its mortgage servicing rights. Since the valuation model uses significant unobservable inputs, the Corporation classifies mortgage servicing rights within Level 3.
The Corporation utilizes a third-party vendor to perform the modeling to estimate the fair value of its mortgage servicing rights. The Corporation reviews the estimated fair values and assumptions used by the third party in the model on a quarterly basis. The Corporation also compares the estimates of fair value and assumptions to recent market activity and against its own experience. See Note 7 (Mortgage Servicing Rights and Mortgage Servicing Activity) for further information on mortgage servicing rights valuation assumptions.
Derivatives. The Corporation's derivatives include interest rate swaps and written loan commitments and forward sales contracts related to residential mortgage loan origination activity. Valuations for interest rate swaps are derived from third-party models whose significant inputs are readily observable market parameters, primarily yield curves, with appropriate adjustments for liquidity and credit risk. These fair value measurements are classified as Level 2. The fair values of written loan commitments and forward sales contracts on the associated loans are based on quoted prices for similar loans in the secondary market, consistent with the valuation of residential mortgage loans held for sale. Expected net future cash flows related to loan servicing activities are included in the fair value measurement of written loan commitments. A written loan commitment does not bind the potential borrower to entering into the loan, nor does it guarantee that the Corporation will approve the potential borrower for the loan. Therefore, when determining fair value, the Corporation makes estimates of expected "fallout" (interest rate locked pipeline loans not expected to close), using models, which consider cumulative historical fallout rates and other factors. Fallout can occur for a variety of reasons including falling rate environments when a borrower will abandon a fixed rate loan commitment at one lender and enter into a new lower fixed rate loan commitment at another, when a borrower is not approved as an acceptable credit by the lender or for a variety of other noneconomic reasons. Fallout is not a significant input to the fair value of the written loan commitments in their entirety. These measurements are classified as Level 2.
Derivative assets are typically secured through securities with financial counterparties or cross collateralization with a borrowing customer. Derivative liabilities are typically secured through the Corporation pledging securities to financial counterparties or, in the case of a borrowing customer, by the right of setoff. The Corporation considers factors such as the likelihood of default by itself and its counterparties, right of setoff, and remaining maturities in determining the appropriate fair value adjustments. All derivative counterparties approved by the Corporation's Asset and Liability Committee are regularly reviewed, and appropriate business action is taken to adjust the exposure to certain counterparties, as necessary. Counterparty exposure is evaluated by netting positions that are subject to master netting agreements, as well as considering the amount of marketable collateral securing the position. This approach used to estimate impacted exposures to counterparties is also used by the Corporation to estimate its own credit risk on derivative liability positions. To date, no material losses have been incurred due to a counterparty's inability to pay any uncollateralized position. There was no significant change in value of derivative assets and liabilities attributed to credit risk in the year ended December 31, 2013.
True-up liability. In connection with the George Washington and Midwest acquisitions in 2010, the Bank has agreed to pay the FDIC should the estimated losses on the acquired loan portfolios as well as servicing fees earned on the acquired loan portfolios not meet thresholds as stated in the loss sharing agreements (the "true-up liability"). This contingent consideration is classified as a liability within accrued taxes, expenses and other liabilities on the Consolidated Balance Sheet and is remeasured at fair value each reporting date until the contingency is resolved. The changes in fair value are recognized in earnings in the current period.
An expected value methodology is used as a starting point for determining the fair value of the true-up liability based on the contractual terms prescribed in the loss sharing agreements. The resulting values under both calculations are discounted over 10 years (the period defined in the loss sharing agreements) to reflect the uncertainty in the timing and payment of the true-up liability by the Bank to arrive at a net present value. The discount rate used to value the true-up liability was 3.69% and 2.95% as of December 31, 2013 and 2012, respectively. Increasing or decreasing the discount rate by one percentage point would change the liability by approximately $0.8 million and $0.7 million, respectively, as of December 31, 2013.
In accordance with the loss sharing agreements governing the Midwest acquisition, on July 15, 2020 (the “Midwest True-Up Measurement Date”), the Bank has agreed to pay to the FDIC half of the amount, if positive, calculated as: (1) 20% of the intrinsic loss estimate of the FDIC (approximately $152 million); minus (2) the sum of (A) 25% of the asset premium paid in connection with the Midwest acquisition (approximately $21 million); plus (B) 25% of the cumulative shared-loss payments (as defined below) plus (C) the cumulative servicing amount (as defined below). The fair value of the true-up liability associated with the Midwest acquisition was $7.1 million and $7.6 million as of December 31, 2013 and December 31, 2012, respectively.
In accordance with the loss sharing agreements governing the George Washington acquisition, on April 14, 2020 (the “George Washington True-Up Measurement Date”), the Bank has agreed to pay to the FDIC 50% of the excess, if any, of (1) 20% of the stated threshold (approximately $34.4 million) less (2) the sum of (A) 25% of the asset discount (approximately $12 million) received in connection with the George Washington acquisition plus (B) 25% of the cumulative shared-loss payments (as defined below) plus (C) the cumulative servicing amount (as defined below). The fair value of the true-up liability associated with the George Washington acquisition was $4.3 million and $4.6 million as of December 31, 2013 and December 31, 2012, respectively.
For the purposes of the above calculations, cumulative shared-loss payments means: (i) the aggregate of all of the payments made or payable to the Bank under the loss sharing agreements minus (ii) the aggregate of all of the payments made or payable to the FDIC. The cumulative servicing amount means the period servicing amounts (as defined in the loss sharing agreements) for every consecutive twelve-month period prior to and ending on the Midwest and George Washington True-Up Measurement Dates. The cumulative loss share payments and cumulative service amounts components of the true-up calculations are estimated each period end based on the expected amount and timing of cash flows of the acquired loan portfolios. See Note 4 (Loans) and Note 5 (Allowance for Loan and Lease Losses) for additional information on the estimated cash flows of the acquired loan portfolios.
The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2013 and 2012 are summarized as follows:
	Year Ended
	December 31, 2013						December 31, 2012
	Available-for-sale securities			True-up liability			Available-for-sale securities			True-up liability
Balance at beginning of period	$	49,661		$	12,259		$	87,539		$	11,551
Fair value of assets acquired	3,271			—			—			—
(Gains) losses included in earnings (a)	—			(796		)	—			708
Unrealized gains (losses) (b)	(2,635		)	—			5,282			—
Purchases	297,231			—			—			—
Sales	—			—			(40,520		)	—
Settlements	82			—			(2,640		)	—
Net transfers into (out of) Level 3	—			—			—			—
Balance at ending of period	$	347,610		$	11,463		$	49,661		$	12,259
(a) Reported in noninterest expense
(b) Reported in other comprehensive income (loss)
Fair Value Option
Residential mortgage loans held for sale are recorded at fair value under fair value option accounting guidance. The election of the fair value option aligns the accounting for these loans with the related hedges. It also eliminates the requirements of the hedge accounting under GAAP.
Interest income on loans held for sale is accrued on the principal outstanding primarily using the “simple-interest” method. None of these loans were 90 days or more past due, nor were any on nonaccrual as of December 31, 2013 and 2012. The aggregate fair value, contractual balance and gain or loss on loans held for sale was as follows:
		December 31, 2013			December 31, 2012
Aggregate fair value carrying amount		$	11,622		$	23,683
Aggregate unpaid principal / contractual balance		11,438			22,765
Carrying amount over aggregate unpaid principal (a)		$	184		$	918
(a) These changes are included in loan sales and servicing income in the Consolidated Statement of Income.
Disclosures about Fair Value of Financial Instruments
The carrying amount and estimated fair value of the Corporation’s financial instruments that are carried at either fair value or cost as of December 31, 2013 and 2012 are shown in the tables below.
	December 31, 2013
	Carrying			Fair Value
	Amount			Total			Level 1			Level 2		Level 3
Financial assets:
Cash and due from banks	$	917,822		$	917,822		$	917,822		$	—	$	—
Available-for-sale securities	3,273,174			3,273,174			3,036			2,922,527		347,611
Held-to-maturity securities	2,935,688			2,824,240			—			2,824,240		—
Other securities	180,803			180,803			—			180,803		—
Loans held for sale	11,622			11,622			—			11,622		—
Net originated loans	10,116,903			10,017,722			—			—		10,017,722
Net acquired loans	3,494,874			3,627,275			—			—		3,627,275
Net covered loans and loss share receivable	547,943			547,943			—			—		547,943
Accrued interest receivable	52,929			52,929			—			52,929		—
Derivatives	47,902			47,902			—			47,902		—
Financial liabilities:
Deposits	$	19,533,601		$	19,532,368		$	—		$	19,532,368	$	—
Federal funds purchased and securities sold under agreements to repurchase	851,535			851,535			—			851,535		—
Wholesale borrowings	200,600			204,124			—			204,124		—
Long-term debt	324,428			319,711			—			319,711		—
Accrued interest payable	9,339			9,339			—			9,339		—
Derivatives	58,201			58,201			—			58,201		—
	December 31, 2012
	Carrying			Fair Value
	Amount			Total			Level 1			Level 2		Level 3
Financial assets:
Cash and due from banks	$	258,014		$	258,014		$	258,014		$	—	$	—
Available for sale securities	2,920,971			2,920,971			3,241			2,868,069		49,661
Held to maturity securities	622,121			630,799			—			630,799		—
Other securities	140,717			140,717			—			140,717		—
Loans held for sale	23,683			23,683			—			23,683		—
Net noncovered loans	8,632,717			8,604,872			—			—		8,604,872
Net covered loans and loss share receivable	975,870			975,870			—			—		975,870
Accrued interest receivable	40,389			40,389			—			40,389		—
Derivatives	63,231			63,231			—			63,231		—
Financial liabilities:
Deposits	$	11,759,425		$	11,765,873		$	—		$	11,765,873	$	—
Federal funds purchased and securities sold under agreements to repurchase	1,104,525			1,104,525			—			1,104,525		—
Wholesale borrowings	136,883			143,029			—			143,029		—
Accrued interest payable	2,515			2,515			—			2,515		—
Derivatives	77,968			77,968			—			77,968		—
The following methods and assumptions were used to estimate the fair values of each class of financial instrument presented:
Cash and cash equivalents – For these short-term instruments, the carrying amount is considered a reasonable estimate of fair value.
Investment securities – See Financial Instruments Measured at Fair Value above.
Loans held for sale – The majority of loans held for sale are residential mortgage loans which are recorded at fair value. All other loans held for sale are recorded at the lower of cost or market, less costs to sell. See Financial Instruments Measured at Fair Value above.
Net originated loans – The originated loan portfolio was segmented based on loan type and repricing characteristics. Carrying values are used to estimate fair values of variable rate loans. A discounted cash flow method was used to estimate the fair value of fixed-rate loans. Discounting was based on the contractual cash flows, and discount rates are based on the year-end yield curve plus a spread that reflects current pricing on loans with similar characteristics. If applicable, prepayment assumptions are factored into the fair value determination based on historical experience and current economic conditions.
Net acquired and covered loans – Fair values for acquired and covered loans were estimated based on a discounted projected cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and current discount rates. Loans were grouped together according to similar characteristics and were treated in the aggregate when applying various valuation techniques. The discount rates used for loans are based on current market rates for new originations of comparable loans and include adjustments for liquidity concerns. The discount rate does not include a factor for credit losses as that has been included in the estimated cash flows.
Loss share receivable – This loss sharing asset is measured separately from the related covered assets as it is not contractually embedded in the covered assets and is not transferable with the covered assets should the Bank choose to dispose of them. Fair value was estimated using discounted projected cash flows related to the FDIC loss share agreements based on the expected reimbursements for losses and the applicable loss sharing percentages. These cash flows were discounted to reflect the uncertainty of the timing and receipt from the FDIC.
Accrued interest receivable – The carrying amount is considered a reasonable estimate of fair value.
Mortgage servicing rights – See Financial Instruments Measured at Fair Value above.
Deposits – The estimated fair value of deposits with no stated maturity, which includes demand deposits, money market accounts and other savings accounts, are established at carrying value because of the customers' ability to withdraw funds immediately. A discounted cash flow method is used to estimate the fair value of fixed rate time deposits. Discounting was based on the contractual cash flows and the current rates at which similar deposits with similar remaining maturities would be issued.
Federal funds purchased and securities sold under agreements to repurchase, wholesale borrowings and long-term debt – The carrying amount of variable rate borrowings including federal funds purchased is considered to be their fair value. Quoted market prices or the discounted cash flow method was used to estimate the fair value of the Corporation's long-term debt. Discounting was based on the contractual cash flows and the current rate at which debt with similar terms could be issued.
Accrued interest payable – The carrying amount is considered a reasonable estimate of fair value.
Derivative assets and liabilities – See Financial Instruments Measured at Fair Value above.
True-up liability – See Financial Instruments Measured at Fair Value above.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives and Hedging Activities	'
	Derivatives and Hedging Activity
	The Corporation, through its mortgage banking and risk management operations, is party to various derivative instruments that are used for asset and liability management and customers' financing needs. Derivative instruments are contracts between two or more parties that have a notional amount and underlying variable, require no net investment and allow for the net settlement of positions. The notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. The underlying variable represents a specified interest rate, index or other component. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the market value of the derivative contract.
	The predominant derivative and hedging activities include interest rate swaps and certain mortgage banking activities. Generally, these instruments help the Corporation manage exposure to market risk, and meet customer financing needs. Market risk represents the possibility that economic value or net interest income will be adversely affected by fluctuations in external factors, such as interest rates, market-driven rates and prices or other economic factors. Foreign exchange contracts are entered into to accommodate the needs of customers.
	Derivatives Designated in Hedge Relationships
	The Corporation's fixed rate loans result in exposure to losses in value as interest rates change. The risk management objective for hedging fixed rate loans is to convert the fixed rate received to a floating rate. The Corporation hedges exposure to changes in the fair value of fixed rate loans through the use of swaps. For a qualifying fair value hedge, changes in the value of the derivatives that have been highly effective as hedges are recognized in current period earnings along with the corresponding changes in the fair value of the designated hedged item attributable to the risk being hedged.
	Through the Corporation's FRAP program, a customer received a fixed interest rate commercial loan and the Corporation subsequently converted that fixed rate loan to a variable rate instrument over the term of the loan by entering into an interest rate swap with a dealer counterparty. The Corporation receives a fixed rate payment from the customer on the loan and pays the equivalent amount to the dealer counterparty on the swap in exchange for a variable rate payment based on the one-month LIBOR index. These interest rate swaps are designated as fair value hedges. Through application of the "short cut method of accounting", there is an assumption that the hedges are effective. The Corporation discontinued originating interest rate swaps under the FRAP Program in February 2008 and subsequently began a new interest rate swap program for commercial loan customers, termed the Back-to-Back Program. These swaps do not qualify as designated hedges; therefore, each swap is accounted for as a stand-alone derivative.
	At December 31, 2013 and 2012, the notional values or contractual amounts and fair value of the Corporation's derivatives designated in hedge relationships were as follows:
		Asset Derivatives													Liability Derivatives
		December 31, 2013						December 31, 2012							December 31, 2013					December 31, 2012
		Notional/ Contract Amount			Fair			Notional/ Contract Amount			Fair				Notional/ Contract Amount			Fair		Notional/ Contract Amount		Fair
					Value (a)						Value (a)							Value (b)				Value (b)
	Interest rate swaps:
	Fair value hedges	$	—		$	—		$	—		$	—			$	126,637		$	11,574	$	161,133	$	19,080
	(a) Included in Other Assets on the Consolidated Balance Sheet
	(b) Included in Other Liabilities on the Consolidated Balance Sheet
	Derivatives Not Designated in Hedge Relationships
	As of December 31, 2013 and 2012, the notional values or contractual amounts and fair value of the Corporation's derivatives not designated in hedge relationships were as follows:
		Asset Derivatives													Liability Derivatives
		December 31, 2013						December 31, 2012							December 31, 2013					December 31, 2012
		Notional/ Contract Amount			Fair Value(a)			Notional/ Contract Amount			Fair Value(a)				Notional/ Contract Amount			Fair Value(b)		Notional/ Contract Amount		Fair Value(b)
	Interest rate swaps	$	1,622,525		$	46,577		$	1,204,835		$	58,769			$	1,622,531		$	46,577	$	1,204,835	$	58,769
	Mortgage loan commitments	90,541			891			168,271			4,400				—			—		—		—
	Forward sales contracts	40,906			384			—			—				—			—		124,017		62
	Credit contracts	—			—			—			—				49,914			—		25,225		—
	Foreign exchange	6,478			50			6,662			62				6,893			50		6,026		57
	Other	—			—			—			—				63,813			—		31,492		—
	Total	$	1,760,450		$	47,902		$	1,379,768		$	63,231			$	1,743,151		$	46,627	$	1,391,595	$	58,888
	(a) Included in Other Assets on the Consolidated Balance Sheet
	(b) Included in Other Liabilities on the Consolidated Balance Sheet
	Interest Rate Swaps. The Corporation's Back-to-Back Program is an interest rate swap program for commercial loan customers that provides the customer with a fixed rate loan while creating a variable rate asset for the Corporation through the customer entering into an interest rate swap with the Corporation on terms that match the loan. The Corporation offsets its risk exposure by entering into an offsetting interest rate swap with a dealer counterparty. These swaps do not qualify as designated hedges; therefore, each swap is accounted for as a standalone derivative.
	Mortgage banking. In the normal course of business, the Corporation sells originated mortgage loans into the secondary mortgage loan markets. During the period of loan origination and prior to the sale of the loans in the secondary market, the Corporation has exposure to movements in interest rates associated with mortgage loans that are in the "mortgage pipeline" and the "mortgage warehouse". A pipeline loan is one in which the Corporation has entered into a written mortgage loan commitment with a potential borrower that will be held for resale. Once a mortgage loan is closed and funded, it is included within the mortgage warehouse of loans awaiting sale and delivery into the secondary market.
	Written loan commitments that relate to the origination of mortgage loans that will be held for resale are considered free-standing derivatives and do not qualify for hedge accounting. Written loan commitments generally have a term of up to 60 days before the closing of the loan. The loan commitment does not bind the potential borrower to entering into the loan, nor does it guarantee that the Corporation will approve the potential borrower for the loan. Therefore, when determining fair value, the Corporation makes estimates of expected "fallout" (loan commitments not expected to close), using models which consider cumulative historical fallout rates and other factors. In addition, expected net future cash flows related to loan servicing activities are included in the fair value measurement of a written loan commitment.
	Written loan commitments in which the borrower has locked in an interest rate results in market risk to the Corporation to the extent market interest rates change from the rate quoted to the borrower. The Corporation economically hedges the risk of changing interest rates associated with its interest rate lock commitments by entering into forward sales contracts.
	The Corporation's warehouse (mortgage loans held for sale) is subject to changes in fair value, due to fluctuations in interest rates from the loan's closing date through the date of sale of the loan into the secondary market. Typically, the fair value of the warehouse declines in value when interest rates increase and rises in value when interest rates decrease. To mitigate this risk, the Corporation enters into forward sales contracts on a significant portion of the warehouse to provide an economic hedge against those changes in fair value. Mortgage loans held for sale and the forward sales contracts were recorded at fair value with ineffective changes in value recorded in current earnings as Loan sales and servicing income.
	Credit contracts. Prior to implementation of the Back-to-Back Program, certain of the Corporation's commercial loan customers entered into interest rate swaps with unaffiliated dealer counterparties. The Corporation entered into swap participations with these dealer counterparties whereby the Corporation guaranteed payment in the event that the counterparty experienced a loss on the interest rate swap due to a failure to pay by the Corporation's commercial loan customer. The Corporation simultaneously entered into reimbursement agreements with the commercial loan customers obligating the customers to reimburse the Corporation for any payments it makes under the swap participations. The Corporation monitors its payment risk on its swap participations by monitoring the creditworthiness of its commercial loan customers, which is based on the normal credit review process the Corporation would have performed had it entered into these derivative instruments directly with the commercial loan customers. At December 31, 2013, the remaining terms on these swap participation agreements generally ranged from less than one to nine years. The Corporation's maximum estimated exposure to written swap participations, as measured by projecting a maximum value of the guaranteed derivative instruments based on interest rate curve simulations and assuming 100% default by all obligors on the maximum values, was approximately $2.8 million as of December 31, 2013. The fair values of the written swap participations were not material at December 31, 2013 or 2012.
	Gains and losses recognized in income on nondesignated hedging instruments for the years ended December 31, 2013, 2012 and 2011 are as follows:
	Derivatives not		Location of Gain/(Loss)	Amount of Gain / (Loss) Recognized
	designated as hedging		Recognized	in Income on Derivatives
	instruments		in Income on	Year Ended December 31,
			Derivative	2013			2012			2011
	Mortgage loan commitments		Other operating income	(3,509		)	(559		)	3,576
	Forward sales contracts		Other operating income	446			1,737			(3,904		)
	Foreign exchange contracts		Other operating income	(116		)	189			9
	Other		Other operating expense	—			—			(1,324		)
	Total			$	(3,179	)	$	1,367		$	(1,643	)
	Counterparty Credit Risk
	Like other financial instruments, derivatives contain an element of "credit risk" or the possibility that the Corporation will incur a loss because a counterparty, which may be a bank, a broker-dealer or a customer, fails to meet its contractual obligations. This risk is measured as the expected positive replacement value of contracts. All derivative contracts may be executed only with exchanges or counterparties approved by the Corporation's ALCO, and only within the Corporation's Board of Directors Credit Committee approved credit exposure limits. Where contracts have been created for customers, the Corporation enters into derivatives with dealers to offset its risk exposure. To manage the credit exposure to exchanges and counterparties, the Corporation generally enters into bilateral collateral agreements using standard forms published by the ISDA. These agreements are to include thresholds of credit exposure or the maximum amount of unsecured credit exposure that the Corporation is willing to assume. Beyond the threshold levels, collateral in the form of securities made available from the investment portfolio or other forms of collateral acceptable under the bilateral collateral agreements are provided. The threshold levels for each counterparty are established by the Corporation's ALCO. The Corporation generally posts collateral in the form of highly rated Government Agency issued bonds or MBS. Collateral posted against derivative liabilities was $70.5 million and $96.5 million as of December 31, 2013 and 2012, respectively.
	Derivative assets and liabilities are recorded at fair value on the balance sheet and do not take into account the effects of master netting agreements the Corporation has with its financial institution counterparties. These master netting agreements allow the Corporation to settle all derivative contracts held with a single financial institution counterparty on a net basis, and to offset net derivative positions with related collateral, where applicable. Collateral, usually in the form of investment securities, is posted by the counterparty with net liability position in accordance with contract thresholds. The following tables illustrate the potential effect of the Corporation's derivative master netting arrangements, by type of financial instrument, on the Corporation's statement of financial position as of December 31, 2013 and 2012. The swap agreements the Corporation has in place with its commercial customers are not subject to enforceable master netting arrangements, and, therefore, are excluded from these tables.
		As of December 31, 2013
		Gross amounts recognized			Gross amounts offset in the consolidated balance sheet			Net amounts presented in the consolidated balance sheet			Gross amounts not offset in the consolidated balance sheet						Net amount
											Financial instruments (a)			Collateral (b)
	Derivative Assets
	Interest rate swaps - nondesignated	$	4,791		$	—		$	4,791		$	(4,791	)	$	—		$	—
	Foreign exchange	4			—			4			(46		)	42			—
	Total derivative assets	$	4,795		$	—		$	4,795		$	(4,837	)	$	42		$	—
	Derivative Liabilities
	Interest rate swaps - designated	$	11,574		$	—		$	11,574		$	—		$	(11,574	)	$	—
	Interest rate swaps - nondesignated	41,787			—			41,787			(4,791		)	(36,996		)	—
	Foreign exchange	46			—			46			(46		)	—			—
	Total derivative liabilities	$	53,407		$	—		$	53,407		$	(4,837	)	$	(48,570	)	$	—
		As of December 31, 2012
		Gross amounts recognized			Gross amounts offset in the consolidated balance sheet			Net amounts presented in the consolidated balance sheet			Gross amounts not offset in the consolidated balance sheet						Net amount
											Financial instruments (a)			Collateral (b)
Derivative Assets
Interest rate swaps - nondesignated	$	55		$	—		$	55		$	(55	)	$	—		$	—
Foreign exchange	14			—			14			(14		)	—			—
Total derivative assets	$	69		$	—		$	69		$	(69	)	$	—		$	—
Derivative Liabilities
Interest rate swaps - designated	$	19,080		$	—		$	19,080		$	—		$	(19,080	)	$	—
Interest rate swaps - nondesignated	58,714			—			58,714			(55		)	(58,659		)	—
Foreign exchange	45			—			45			(14		)	(31		)	—
Total derivative liabilities	$	77,839		$	—		$	77,839		$	(69	)	$	(77,770	)	$	—
(a) For derivative assets, this includes any derivative liability fair values that could be offset in the event of counterparty default. For derivative liabilities, this includes any derivative asset fair values that could be offset in the event of counterparty default.
(b) For derivate assets, this includes the fair value of collateral received by the Corporation from the counterparty. Securities received as collateral are not included in the Consolidated Balance Sheet unless the counterparty defaults. For derivative liabilities, this includes the fair value of securities pledged by the Corporation to the counterparty. These securities are included in the Consolidated Balance Sheet unless the Corporation defaults

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Obligations Under Noncancelable Leases
	The Corporation is obligated under various noncancelable operating leases on branch offices. Minimum future rental payments under noncancelable operating leases at December 31, 2013 are as follows:
	Year Ended December 31,		Lease
			Commitments
	2014		$	14,018
	2015		11,871
	2016		9,725
	2017		8,421
	2018		7,007
	2019-2028		19,063
			$	70,105
	Commitments to Extend Credit
	Commitments to extend credit are agreements to lend to a customer provided there is no violation of any condition established in the contract. Loan commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded on the consolidated balance sheets. Additional information is provided in Note 17 (Fair Value Measurement). Commitments generally are extended at the then-prevailing interest rates, have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon the total commitment amounts do not necessarily represent future cash requirements. Loan commitments involve credit risk not reflected on the balance sheet. The Corporation mitigates exposure to credit risk with internal controls that guide how applications for credit are reviewed and approved, how credit limits are established and, when necessary, how demands for collateral are made. Collateral held varies but may include accounts receivable, inventory, property, plant and equipment, and income-producing commercial properties. Management evaluates the creditworthiness of each prospective borrower on a case-by-case basis and, when appropriate, adjusts the allowance for probable credit losses inherent in all commitments. The allowance for unfunded lending commitments at December 31, 2013 was $7.9 million, compared with $5.4 million at December 31, 2012.
	The following table shows the remaining contractual amount of each class of commitments to extend credit as of December 31, 2013 and 2012. This amount represents the Corporation's maximum exposure to loss if the customer were to draw upon the full amount of the commitment and subsequently default on payment for the total amount of the then outstanding loan.
			At December 31,
			2013			2012
	Loan Commitments
		Commercial	$	3,367,625		$	2,431,023
		Consumer	2,179,010			1,720,518
		Total loan commitments	$	5,546,635		$	4,151,541
	Guarantees
	The Corporation is a guarantor in certain agreements with third parties. The following table shows the types of guarantees the Corporation had outstanding as of December 31, 2013 and 2012.
			At December 31,
			2013			2012
	Financial guarantees
		Standby letters of credit	$	196,400		$	136,202
		Loans sold with recourse	45,082			42,383
		Total financial guarantees	$	241,482		$	178,585
	Standby letters of credit obligate the Corporation to pay a specified third party when a customer fails to repay an outstanding loan or debt instrument, or fails to perform some contractual nonfinancial obligation. The credit risk involved in issuing letters of credit is essentially the same as involved in extending loan facilities to customers. Collateral held varies, but may include marketable securities, equipment and real estate. Any amounts drawn under standby letters of credit are treated as loans; they bear interest and pose the same credit risk to the Corporation as a loan. Except for short-term guarantees of $101.9 million at December 31, 2013, the remaining guarantees extend in varying amounts through 2018.
	Asset Sales
	The Corporation regularly sells residential mortgage loans service retained to GSEs as part of its mortgage banking activities. The Corporation provides customary representation and warranties to the GSEs in conjunction with these sales. These representations and warranties generally require the Corporation to repurchase assets if it is subsequently determined that a loan did not meet specified criteria, such as a documentation deficiency or rescission of mortgage insurance. If the Corporation is unable to cure or refute a repurchase request, the Corporation is generally obligated to repurchase the loan or otherwise reimburse the counterparty for losses. The Corporation also sells residential mortgage loans serviced released to other investors which contain early payment default recourse provisions. As of December 31, 2013 and 2012, the Corporation had sold $34.6 million and $32.5 million, respectively, of outstanding residential mortgage loans to GSEs and other investors with recourse provisions. The Corporation had reserved $8.7 million and $1.5 million as of December 31, 2013 and 2012, respectively, for estimated losses from representation and warranty obligations and early payment default recourse provisions.
	Due to prior acquisitions, as of December 31, 2013, the Corporation continued to service approximately $6.4 million in manufactured housing loans that were sold with recourse compared to $8.2 million as of December 31, 2012. As of December 31, 2013, the Corporation had reserved $1.1 million for estimated losses from these manufactured housing loans compared to $1.2 million as of December 31, 2012.
	The total reserve associated with loans sold with recourse was approximately $9.9 million and $2.7 million as of December 31, 2013 and 2012, respectively, and is included in accrued taxes, expenses and other liabilities on the consolidated balance sheet. As a result of the merger with Citizens, $6.0 million was recorded as a contingent liability to reflect the fair value of the liability associated with the expected commitment to repurchase mortgage loans previously sold by Citizens subject to recourse provisions. The Corporation's reserve reflects management's best estimate of losses. The Corporation's reserving methodology uses current information about investor repurchase requests, and assumptions about repurchase mix and loss severity, based upon the Corporation's most recent loss trends. The Corporation also considers qualitative factors that may result in anticipated losses differing from historical loss trends, such as loan vintage, underwriting characteristics and macroeconomic trends.
	Changes in the amount of the repurchase reserve for the years ended December 31, 2013 and 2012 are as follows:
		Year Ended December 31, 2013
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	1,500		$	1,167		$	2,667
	Assumed Obligation	6,000			—			6,000
	Net realized losses	(5,770		)	—			(5,770		)
	Net increase (decrease) to reserve	7,007			(53		)	6,954
	Balance at end of period	$	8,737		$	1,114		$	9,851
		Year ended December 31, 2012
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	470		$	1,273		$	1,743
	Net realized losses	(863		)	—			(863		)
	Net increase (decrease) to reserve	1,893			(106		)	1,787
	Balance at end of period	$	1,500		$	1,167		$	2,667
	Litigation
	In the normal course of business, the Corporation and its subsidiaries are at all times subject to pending and threatened legal actions, some for which the relief or damages sought are substantial. Although the Corporation is not able to predict the outcome of such actions, after reviewing pending and threatened actions with counsel, Management believes that based on the information currently available the outcome of such actions, individually or in the aggregate, will not have a material adverse effect on the results of operations or shareholders' equity of the Corporation. However, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the results of operations in a particular future period as the time and amount of any resolution of such actions and its relationship to the future results of operations are not known.
	Reserves are established for legal claims only when losses associated with the claims are judged to be probable, and the loss can be reasonably estimated. In many lawsuits and arbitrations, including almost all of the class action lawsuits, it is not possible to determine whether a liability will be incurred or to estimate the ultimate or minimum amount of that liability until the case is close to resolution, in which case a reserve will not be recognized until that time.
	Overdraft Litigation
	Commencing in December 2010, two separate lawsuits were filed in the Summit County Court of Common Pleas and the Lake County Court of Common Pleas against the Corporation and the Bank. The complaints were brought as putative class actions on behalf of Ohio residents who maintained a checking account at the Bank and who incurred one or more overdraft fees as a result of the alleged re-sequencing of debit transactions. The lawsuit that had been filed in Summit County Court of Common Pleas was dismissed without prejudice on July 11, 2011. The remaining suit in Lake County seeks actual damages, disgorgement of overdraft fees, punitive damages, interest, injunctive relief and attorney fees. In December 2012, the trial court issued an order certifying a proposed class and the Bank and Corporation appealed the order to the Eleventh District Court of Appeals. In September 2013, the Eleventh District Court of Appeals affirmed in part and reversed in part the trial court's class certification order, and remanded the case back to the trial court for further consideration, in particular with respect to the class definition. On October 9, 2013, the Bank and Corporation filed with the Eleventh District Court of Appeals an application for reconsideration and application for consideration en banc. On November 20, 2013, the Eleventh District denied those applications. On December 4, 2013, the Bank and Corporation filed a notice of appeal with the Ohio Supreme Court, and on January 3, 2014, they filed with the Ohio Supreme Court a memorandum in support of the Court's exercising its jurisdiction and accepting the appeal. The plaintiffs have filed an opposition and to date the Court has not yet ruled.
	365/360 Interest Litigation
	In August 2008, a lawsuit was filed in the Cuyahoga County Court of Common Pleas against the Bank. The breach-of-contract complaint was brought as a putative class action on behalf of Ohio commercial borrowers who allegedly had the interest they owed calculated improperly by using the 365/360 method. The complaint sought actual damages, interest, injunctive relief and attorney fees. In June 2012, the trial court certified the class and the Bank appealed the determination. In May 2013, the court of appeals reversed the trial court's decision on class certification, thereby decertifying the class, and remanded the case back to the trial court for further proceedings. In August 2013, the suit was dismissed without prejudice.
	Shareholder Derivative Litigation
	In July 2012, three related shareholder derivative lawsuits were filed in the United States District Court for the Northern District of Ohio. The lawsuits named as defendants the members of the Corporation's board of directors and certain senior executives, and generally alleged that the defendants breached fiduciary duties owed to the Corporation in connection with decisions concerning executive compensation and that the senior executives named as defendants were unjustly enriched by receiving excessive compensation. The lawsuits also alleged that the defendants caused the Corporation to issue incomplete or misleading disclosures concerning executive compensation in its 2012 proxy statement. Following consolidation of the lawsuits, the court dismissed the plaintiffs' consolidated complaint with prejudice in May 2013, and the matter is now concluded.
	Merger Litigation
	Between September 17, 2012 and October 5, 2012, alleged shareholders of Citizens filed six purported class action lawsuits in the Circuit Court of Genesee County, Michigan, relating to the proposed merger between Citizens and FirstMerit, which merger closed in April 2013. The lawsuits were consolidated under the caption In re Citizens Republic Bancorp, Inc. Shareholder Litigation, Case No. 12-99027-CK (the "Lawsuit"). The consolidated complaint in the Lawsuit alleges that the former directors of Citizens breached their fiduciary duties by failing to obtain the best available price in the merger and by not providing Citizens shareholders with all material information related to the merger, and that FirstMerit and Citizens aided and abetted those alleged breaches of fiduciary duty.  The Complaint sought declaratory and injunctive relief to prevent the consummation of the merger, rescissory damages and other equitable relief.
	The plaintiffs and defendants have entered into a settlement of the Lawsuit, and the court approved the settlement on September 20, 2013. Under the settlement, the defendants amended the joint proxy statement/prospectus relating to the merger to include certain supplemental disclosures to shareholders of Citizens and agreed to pay attorneys' fees and expenses as awarded by the court. An alleged former shareholder of Citizens objected to the settlement and has filed an appeal of the court's approval of the settlement; the settlement will not become final until that appeal has been resolved.
	Based on information currently available, consultation with counsel, available insurance coverage and established reserves, Management believes that the eventual outcome of all claims against the Corporation and its subsidiaries will not, individually or in the aggregate, have a material adverse effect on its consolidated financial position or results of operations. However, it is possible that the ultimate resolution of these matters, if unfavorable, may be material to the results of operations for a particular period. The Corporation has not established any reserves with respect to any of this disclosed litigation because it is not possible to determine (i) whether a liability has been incurred or (ii) an estimate of the ultimate or minimum amount of such liability.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2013
Shareholders' Equity [Abstract]	'
Stockholders' Equity	'
	Shareholders' Equity
	Citizens Acquisition
	As a result of the acquisition of Citizens, a warrant issued by Citizens to the U.S. Treasury to purchase up to 1,757,812.5 shares of Citizens' common stock has been converted into a warrant issued by the Corporation to the U.S. Treasury to purchase 2,408,203 shares of FirstMerit Common Stock. Due to a dividend protection clause, which reduces the exercise price on a penny for penny basis for any dividend paid along with a corresponding increase in the amount of shares available to purchase, there are now 2,471,681 shares at an adjusted exercise price of $18.21 associated with the warrant issued to the U.S. Treasury. Additional information about the acquisition is included in Note 2 (Business Combinations).
	Preferred Stock
	The Corporation has 7,000,000 shares of authorized Preferred Stock and has designated 115,000 shares of its Preferred Stock as 5.875% Non-Cumulative Perpetual Preferred Stock, Series A. On February 4, 2013, the Corporation issued 100,000 shares of its 5.875% Non-Cumulative Perpetual Preferred Stock, Series A, which began paying cash dividends on May 4, 2013, quarterly in arrears on the 4th day of February, May, August and November.
	Earnings per Share
	The reconciliation between basic and diluted EPS using the two-class method and treasury stock method is presented as follows:
		Year Ended December 31,
		2013		2012		2011
	Basic EPS:
	Net income	$	183,684	$	134,106	$	119,558
	Less:
	Cash dividends on 5.875% non-cumulative perpetual series A, preferred stock	5,337		—		—
	Income allocated to participating securities	1,545		—		—
	Net income attributable to common shareholders	$	176,802	$	134,106	$	119,558
	Average Common Stock outstanding used in basic EPS	149,607		109,518		109,102
	Basic net income per share	$	1.18	$	1.22	$	1.1
	Diluted EPS:
	Net income attributable to common shareholders	$	176,802	$	134,106	$	119,558
	Average Common Stock outstanding	149,607		109,518		109,102
	Add: Common Stock equivalents:
	Warrant and stock award plans	814		—		—
	Average Common and Common Stock equivalent shares outstanding	150,421		109,518		109,102
	Diluted net income per share	$	1.18	$	1.22	$	1.1
	Common Stock equivalents consist of employee stock award plans and the common stock warrant. These common stock equivalents do not enter into the calculation of diluted EPS if the impact would be anti-dilutive, that is, increase EPS or reduce a loss per share. There were no antidilutive common stock equivalents for the year ended December 31, 2013, and 1.8 million and 3.4 million antidilutive common stock equivalents for the years ended 2012 and 2011.

Changes_and_Reclassifications_

Changes and Reclassifications Out of Other Comprehensive Income (Notes)	12 Months Ended
	Dec. 31, 2013
Changes and Reclassifications Out of Other Comprehensive Income [Abstract]	'
Changes and Reclassifications Out of Accumulated Other Comprehensive Income	'
	Changes and Reclassifications Out of Accumulated Other Comprehensive Income
	The following table presents the changes in AOCI by component of comprehensive income for the year ended December 31, 2013:
		Year Ended December 31, 2013
		Unrealized and realized securities gains and losses			Pension and post- retirement costs			Total
	Balance at the beginning of the period	$	55,418		$	(71,623	)	$	(16,205	)
	Net gain/(loss) arising during the period, net of tax benefit of $46.6 million and tax expense of $16.8 million, respectively	(86,537		)	31,161			(55,376		)
	Net losses realized on sale of securities reclassified to noninterest income, net of tax benefit of $1.0 million	1,822			—			1,822
	Amortization of prior service cost reclassified to other noninterest expense, net of tax expense of $0.0 million.	—			(1		)	(1		)
	Amortization of actuarial gain, net of tax expense of $1.6 million	—			2,884			2,884
	Balance at the end of the period	$	(29,297	)	$	(37,579	)	$	(66,876	)
	The following table presents current period reclassifications out of AOCI by component of comprehensive income for the year ended December 31, 2013:
		Year Ended December 31, 2013			Statement of Income line item presentation
	Realized (gains) losses on sale of securities	$	2,803		Investment securities losses (gains), net
	Tax expense (benefit) (35%)	(981		)	Income tax expense (benefit)
	Reclassified amount, net of tax	$	1,822

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
Regulatory Matters	'
	Regulatory Matters
	The Corporation is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory – and possibly additional discretionary – actions by regulators that, if undertaken, could have a material effect on the Corporation's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Corporation must meet specific capital guidelines that involve quantitative measures of the Corporation's assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Corporation's capital amounts and classification are also subject to quantitative judgments by regulators about components, risk weightings, and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require the Corporation to maintain minimum amounts and ratios (set forth in the following table) of total and Tier I capital to risk-weighted assets, and of Tier I capital to average assets. At December 31, 2013 and 2012, Management believes the Corporation meets all capital adequacy requirements to which it is subject. The capital terms used in this note to the consolidated financial statements are defined in the regulations as well as in the "Capital Resources" section of Management's Discussion and Analysis of financial condition and results of operations.
		Consolidated
		Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2013	Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)	$	2,281,812		13.98	%	>	$	1,305,667		8	%	>	$	1,632,083		10	%
	Tier I Capital
	(to Risk Weighted Assets)	$	1,882,725		11.54	%	>	$	652,833		4	%	>	$	979,250		6	%
	Tier I Capital
	(to Average Assets)	$	1,882,725		8.15	%	>	$	923,887		4	%	>	$	1,154,858		5	%
		Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2012	Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)	$	1,325,971		12.5	%	>	$	848,627		8	%	>	$	1,060,783		10	%
	Tier I Capital
	(to Risk Weighted Assets)	$	1,193,188		11.25	%	>	$	424,313		4	%	>	$	636,470		6	%
	Tier I Capital
	(to Average Assets)	$	1,193,188		8.43	%	>	$	566,212		4	%	>	$	707,765		5	%
	At December 31, 2013 and 2012, the most recent notification from the OCC categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well-capitalized the Bank must maintain minimum total risk-based, Tier I risk-based, and Tier I leverage ratios as set forth in the table. In Management's opinion, there are no conditions or events since the OCC's notification that have changed the Bank's categorization as "well-capitalized."
			Bank Only
			Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2013		Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)		$	2,122,124		13.02	%	>	$	1,303,579		8	%	>	$	1,629,473		10	%
	Tier I Capital
	(to Risk Weighted Assets)		$	1,978,140		12.14	%	>	$	651,789		4	%	>	$	977,684		6	%
	Tier I Capital
	(to Average Assets)		$	1,978,140		8.58	%	>	$	922,312		4	%	>	$	1,152,890		5	%
			Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2012		Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)		$	1,158,312		10.93	%	>	$	847,694		8	%	>	$	1,059,618		10	%
	Tier I Capital
	(to Risk Weighted Assets)		$	1,030,585		9.73	%	>	$	423,847		4	%	>	$	635,771		6	%
	Tier I Capital
	(to Average Assets)		$	1,030,585		7.29	%	>	$	565,414		4	%	>	$	706,768		5	%
	FirstMerit Mortgage Corporation, a subsidiary of the Corporation, is subject to net worth requirements issued by HUD. Failure to meet minimum capital requirements of HUD can result in certain mandatory and possibly additional discretionary actions that, if undertaken, could have a direct material effect on FirstMerit Mortgage Corporation's operations.
	The minimum net worth requirement of HUD at December 31, 2013 and 2012 was $1.0 million and $1.0 million, respectively. FirstMerit Mortgage Corporations' net worth significantly exceeded the HUD requirements at December 31, 2013 and 2012.

Subsequent_Events_unaudited

Subsequent Events (unaudited)	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	In preparing these financial statements, subsequent events were evaluated through the time the financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users, or filed with the Securities and Exchange Commission. In accordance with applicable accounting standards, all material subsequent events have been either recognized in the financial statements or disclosed in the notes to the financial statements.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Basis of Presentation	'
Basis of Accounting	'
	The accounting and reporting policies of the Corporation conform to GAAP and to general practices within the financial services industry.
	In preparing these accompanying consolidated financial statements, subsequent events were evaluated through the time the consolidated financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users, or filed with the SEC.
	The following is a description of the Corporation's significant accounting policies.
Consolidation	'
	Principles of Consolidation
	The Parent Company is a bank holding company whose principal asset is the common stock of its wholly-owned subsidiary, the Bank. The Parent Company’s other subsidiaries include Citizens Savings Corporation of Stark County, FirstMerit Capital Trust I, FirstMerit Risk Management, Inc., FMT, Inc, Citizens Funding Trust I and Citizens Michigan Statutory Trust I. All significant intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	'
	Use of Estimates
	Management must make certain estimates and assumptions that affect the amounts reported in the financial statements and related notes. If these estimates prove to be inaccurate, actual results could differ from those reported.
Business Combinations	'
	Business Combinations
	Business combinations are accounted for using the acquisition method of accounting. Under this accounting method, the acquired company's net assets are recorded at fair value on the date of acquisition, and the results of operations of the acquired company are combined with the Corporation's results from that date forward. Costs related to the acquisition are expensed as incurred. The difference between the purchase price and the fair value of the net assets acquired (including intangible assets with finite lives) is recorded as goodwill. The accounting policy for goodwill and intangible assets is summarized in this note under the heading "Goodwill and Other Intangible Assets". As discussed in Note 2 (Business Combinations), the Corporation completed the merger with Citizens, a Michigan corporation, during 2013.
	(d) Variable Interest Entities
	In general, a VIE is an entity that either (1) has an insufficient amount of equity to carry out its principal activities without additional subordinated financial support, (2) has a group of equity owners that are unable to make significant decisions about its activities, or (3) has a group of equity owners that do not have the obligation to absorb losses or the right to receive returns generated by its operations. If any of these characteristics is present, the entity is subject to a variable interests consolidation model, and consolidation is based on variable interests, not on ownership of the entity's outstanding voting stock. Variable interests are defined as contractual, ownership, or other monetary interests in an entity that change with fluctuations in the entity's net asset value. The primary beneficiary is required to consolidate the VIE. The primary beneficiary is defined as the party that has both the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could be significant to the VIE.
	As a result of the merger with Citizens, the Corporation obtained variable interests in two active wholly owned trusts that were formed for the purpose of issuing securities. Each of the two active trusts issued separate offerings of trust preferred securities to investors in 2006 and 2003, with respect to which there remain $48.7 million and $25.7 million in aggregate liquidation amounts outstanding, respectively, as of December 31, 2013. The gross proceeds from the issuances were used to purchase junior subordinated deferrable interest debentures issued by Citizens, assumed by the Corporation. These junior subordinated deferrable interest debentures are the sole asset of each trust. The trust preferred securities held by these entities currently qualify as Tier 1 capital and are classified as long-term debt on the Consolidated Balance Sheet, with the associated interest expense recorded in long-term debt on the Consolidated Statement of Income. The expected losses and residual returns of these entities are absorbed by the trust preferred stock holders, and, therefore, these holders have a variable interest in the trusts. The Corporation is not exposed to loss
Consolidation, Variable Interest Entity, Policy	'
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash and cash equivalents consist of cash and due from banks, interest bearing deposits in other banks and checks in the process of collection.
Investment Securities	'
	Investment Securities
	Debt securities are classified as held-to-maturity when the Corporation has the positive intent and ability to hold the securities to maturity. These securities are reported at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity using the effective yield method. This method produces a constant rate of return on the adjusted carrying amount.
	Securities are classified as available-for-sale when the Corporation intends to hold the securities for an indefinite period of time but may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. Securities available-for-sale are reported at fair value, with unrealized gains and losses, net of income tax, reported as a separate component of other comprehensive income (loss) in shareholders' equity.
	In certain situations, Management may elect to transfer certain debt securities from the available-for-sale to the held to maturity classification. In such cases, any unrealized gain or loss included in accumulated other comprehensive income (loss) at the time of transfer is amortized over the remaining life of the security as a yield adjustment such that only the remaining initial discount or premium from the purchase date is recognized in income.
	Interest and dividends on securities, including the amortization of premiums and accretion of discount, are included in interest income. Realized gains or losses on the sales of available-for-sale securities are recorded on the trade date and determined using the specific identification method.
	On at least a quarterly basis, Management evaluates securities that are in an unrealized loss position for OTTI. An investment security is deemed impaired if the fair value of the investment is less than its amortized cost. As part of the impairment evaluation, Management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in earnings and 2) OTTI related to other factors, such as liquidity conditions in the market or changes in market interest rates, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized in earnings.
	Other investments include FHLB and FRB stock. As a member of the FHLB system, the Bank is required to own a certain amount of stock based on the level of borrowings and other factors. The Bank is also a member of its regional FRB. Both FHLB and FRB stock are carried at cost and evaluated for impairment based on the ultimate recovery of par value. Cash and stock dividends received on the stock are reported as interest income in the Consolidated Statement of Income.
Loans and Loan Income	'
	Loans and Loan Income
	Loans originated for investment are stated at their principal amount outstanding adjusted for partial charge-offs, the allowance for loan losses, and net deferred loan fees and costs. Interest income on loans is accrued over the term of the loans primarily using the simple-interest method based on the principal balance outstanding. Interest is not accrued on loans where collectability is uncertain. Accrued interest is presented separately in the balance sheet, except for accrued interest on credit card loans, which is included in the outstanding loan balance. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.
Loans Held for Sale	'
	Loans Held for Sale
	Mortgage loans originated and intended for sale in the secondary market are carried at fair value. The election of the fair value option aligns the accounting for these loans with the related economic hedges. It also eliminates the requirements of hedge accounting under GAAP. Loan origination fees are recorded when earned and related direct loan origination costs are recognized when incurred. Upon their sale, differences between carrying value and sales proceeds realized are recorded to loan sales and servicing income in the Consolidated Statement of Income.
	A discussion of the valuation methodology applied to the Corporation's loans held for sale is described in Note 17 (Fair Value Measurement).
Nonperforming Loans	'
	Nonperforming Loans
	Loans and leases on which payments are past due for 90 days are placed on nonaccrual, with the exception of certain commercial, credit card and mortgage loans and loans that are fully secured and in process of collection. Credit card loans on which payments are past due for 120 days are placed on nonaccrual status. Interest on mortgage loans is accrued until Management deems it uncollectible based upon the specific identification method.
	Loans are generally written off when deemed uncollectible or when they reach a predetermined number of days past due depending upon loan product, terms, and other factors. When a loan is placed on nonaccrual status, interest deemed uncollectible that had been accrued in prior years is charged against the allowance for loan losses and interest deemed uncollectible accrued in the current year is reversed against interest income. Payments subsequently received on nonaccrual loans are generally applied to principal. A loan is returned to accrual status when principal and interest are no longer past due and collectability is probable. This generally requires a sustained period of timely principal and interest payments.
	Under the Corporation's credit policies and practices, individually impaired loans include all nonaccrual and restructured commercial, agricultural, construction, and commercial real estate loans, but exclude certain aggregated consumer loans, mortgage loans, and leases classified as nonaccrual. Loan impairment for all loans is measured based on either the present value of expected future cash flows discounted at the loan's effective interest rate at inception, at the observable market price of the loan, or the fair value of the collateral for certain collateral dependent loans.
	Restructured loans are those on which concessions in terms have been made as a result of deterioration in a borrower's financial condition. In general, the modification or restructuring of a debt constitutes a troubled debt restructuring if the Corporation for economic or legal reasons related to the borrower's financial difficulties grants a concession to the borrower that the Corporation would not otherwise consider under current market conditions. Debt restructurings or loan modifications for a borrower do not necessarily constitute troubled debt restructurings. Troubled debt restructurings do not necessarily result in nonaccrual loans. Specific allowances for loan losses are established for certain consumer, commercial and commercial real estate loans whose terms have been modified in a TDR.
	Acquired nonimpaired loans are placed on nonaccrual and considered and reported as nonperforming or past due using the same criteria applied to the originated portfolio. Acquired impaired loans are not classified as nonperforming assets as the loans are considered to be performing under the provisions of ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality ("ASC 310-30"). Acquired loans restructured after acquisition are not considered TDRs for purposes of the Corporation's accounting and disclosure if the loans evidenced credit deterioration as of the acquisition date and are accounted for in pools.
Allowance for Loan Losses	'
	Allowance for Loan Losses
	The allowance for loan losses is Management's estimate of the amount of probable credit losses inherent in the loan portfolio at the balance sheet date. Increases to the allowance for loan losses are made by charges to the provisions for loan losses. Loans deemed uncollectible are charged against the allowance for loan losses. Recoveries of previously charged-off amounts are credited to the allowance for loan losses. Management estimates credit losses based on individual loans determined to be impaired and on all other loans grouped based on similar risk characteristics.
	The Corporation's historical loss component is the most significant of the allowance for loan losses components and is based on historical loss experience by credit-risk grade (for commercial loan pools) and payment status (for mortgage and consumer loan pools). Loans are pooled based on similar risk characteristics supported by observable data. The historical loss experience component of the allowance for loan losses represents the results of migration analysis of historical net charge-offs for portfolios of loans (including groups of commercial loans within each credit-risk grade and groups of consumer loans by payment status). For measuring loss exposure in a pool of loans, the historical net charge-off or migration experience is utilized to estimate expected losses to be realized from the pool of loans.
	Individual commercial loans are assigned credit-risk grades based on an internal assessment of conditions that affect a borrower’s ability to meet its contractual obligation under the loan agreement. The assessment process includes reviewing a borrower’s current financial information, historical payment experience, credit documentation, public information, and other information specific to each individual borrower. Certain commercial loans are reviewed on an annual, quarterly or rotational basis or as Management becomes aware of information affecting a borrower’s ability to fulfill its obligation.
	The credit-risk grading process for commercial loans is summarized as follows:
	"Pass" Loans (Grades 1, 2, 3, 4) are not considered a greater than normal credit risk. Generally, the borrowers have the apparent ability to satisfy obligations to the bank, and the Corporation anticipates insignificant uncollectible amounts based on its individual loan review.
	"Special-Mention" Loans (Grade 5) are commercial loans that have identified potential weaknesses that deserve Management's close attention. If left uncorrected, these potential weaknesses may result in noticeable deterioration of the repayment prospects for the asset or in the institution's credit position.
	"Substandard" Loans (Grade 6) are inadequately protected by the current financial condition and paying capacity of the obligor or by any collateral pledged. Loans so classified have a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt pursuant to the contractual principal and interest terms. Such loans are characterized by the distinct possibility that the Corporation may sustain some loss if the deficiencies are not corrected.
	"Doubtful" Loans (Grade 7) have all the weaknesses inherent in those classified as substandard, with the added characteristic that existing facts, conditions, and values make collection or liquidation in full highly improbable. Such loans are currently managed separately to determine the highest recovery alternatives.
	If a nonperforming, substandard loan has an outstanding balance of $0.3 million or greater or if a doubtful loan has an outstanding balance of $0.1 million or greater, as determined by the Corporation's credit-risk grading process, further analysis is performed to determine the probable loss, if any, and assign a specific allowance to the loan if needed. The allowance for loan losses relating to originated loans that have become impaired is based on either expected cash flows discounted at the loan's original effective interest rate, the observable market price, or the fair value of the collateral for certain collateral dependent loans. To the extent credit deterioration occurs on purchased loans after the date of acquisition, the Corporation records an allowance for loan losses, net of any expected reimbursement under any FDIC Loss Sharing Agreements.
	Management also considers internal and external factors such as economic conditions, credit quality trends, loan management practices, portfolio monitoring, and other risks, collectively known as qualitative factors, or Q-factors, to estimate credit losses in the loan portfolio. Q-factors are used to reflect changes in the portfolio's collectability characteristics not captured by historical loss data.
	The Corporation also assesses the credit risk associated with off-balance sheet loan commitments and letters of credit. The liability for off-balance sheet credit exposure related to loan commitments and other credit guarantees is included in other liabilities on the Consolidated Balance Sheet.
Acquired Loans, Covered Loans and Related Loss Share Receivable	'
	Acquired Loans, Covered Loans and Related Loss Share Receivable
	Acquired loans (nonimpaired and impaired) are initially measured at fair value as of the acquisition date. The fair value estimates for acquired loans are based on the estimate of expected cash flows, both principal and interest and prepayments, discounted at prevailing market interest rates. Credit discounts representing the principal losses expected over the life of the loan are also a component of the initial fair value; therefore, an allowance for loan losses is not recorded at the acquisition date.
	The Corporation evaluates acquired loans for impairment in accordance with the provisions of ASC 310-30. Acquired loans are considered impaired if there is evidence of credit deterioration since origination and if it is probable at time of acquisition that all contractually required payments will not be collected. In determining the acquisition date fair value of acquired impaired loans, and in subsequent accounting, the Corporation generally aggregates impaired loans into pools of loans with common characteristics. Each pool is accounted for as a single asset with one composite interest rate and an aggregate expectation of cash flows. Expected cash flows at the acquisition date in excess of the fair value of the loans is referred to as the accretable yield and recorded as interest income over the life of the loans. Acquired impaired loans are not classified as nonaccrual or nonperforming as they are considered to be accruing loans because their interest income relates to the accretable yield recognized at the pool level and not to contractual interest payments at the loan level. Subsequent to the acquisition date, increases in expected cash flows will generally result in a recovery of any previously recorded ALLL, to the extent applicable, and/or a reclassification from the nonaccretable difference to accretable yield, which will be recognized prospectively. The present value of any decreases in expected cash flows after the acquisition date will generally result in an impairment charge recorded as a provision for loan losses, resulting in an increase to the ALLL, net of any expected reimbursement under FDIC Loss Share Agreements, to the extent applicable. Revolving loans, including lines of credit and credit cards loans, and leases are excluded from acquired impaired loan accounting.
	For acquired nonimpaired loans, the difference between the acquisition date fair value and the contractual amounts due at the acquisition date represents the fair value adjustment. Fair value adjustments may be discounts (or premiums) to a loan's cost basis and are accreted (or amortized) to interest income over the the loan's remaining life using the level yield method. Subsequent to the acquisition date, the methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans, however, the Corporation records a provision for loan losses only when the required allowance, net of any expected reimbursement under any FDIC Loss Share Agreements, to the extent applicable, exceeds the remaining fair value adjustment.
	Loans acquired in FDIC assisted transactions and covered under FDIC Loss Share Agreements are referred to as covered loans. Covered loans are recorded at fair value at the date of acquisition exclusive of the FDIC Loss Share Agreements. No allowance for loan losses related to covered loans is recorded on the acquisition date as the fair value of the loans acquired incorporates assumptions regarding credit risk.
	A loss share receivable is recorded at the acquisition date which represents the estimated fair value of reimbursement the Corporation expects to receive from the FDIC for incurred losses on certain covered loans. The fair value measurement reflects counterparty credit risk and other uncertainties. The loss share receivable continues to be measured on the same basis as the related indemnified loans. Deterioration in the credit quality of the loans (recorded as an adjustment to the allowance for covered loan losses) would immediately increase the basis of the loss share receivable, with the offset recorded through the consolidated statement of comprehensive income. Increases in the credit quality or cash flows of loans (reflected as an adjustment to yield and accreted into income over the remaining life of the loans) decrease the basis of the loss share receivable, with such decrease being accreted into income over 1) the same period or 2) the life of the loss share agreements, whichever is shorter. Loss assumptions used in the basis of the loss share receivable are consistent with the loss assumptions used to measure the related covered loans.
	Upon the determination of an incurred loss the loss share receivable will be reduced by the amount owed by the FDIC. A corresponding, claim receivable is recorded in accrued interest receivable and other assets on the Consolidated Balance Sheet until cash is received from the FDIC.
	An acquired or covered loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the period of resolution of a nonimpaired loan, any remaining unamortized fair value adjustment is recognized as interest income. In the period of resolution of an impaired loan accounted for on an individual basis, the difference between the carrying amount of the loan and the proceeds received is recognized as a gain or loss within noninterest income. The majority of impaired loans are accounted for within a pool of loans which results in any difference between the proceeds received and the loan carrying amount being deferred as part of the carrying amount of the pool. The accretable amount of the pool remains unaffected from the resolution until the subsequent quarterly cash flow re-estimation. Favorable results from removal of the resolved loan from the pool increase the future accretable yield of the pool, while unfavorable results are recorded as impairment in the quarter of the cash flow re-estimation. Acquired or covered impaired loans subject to modification are not removed from a pool even if those loans would otherwise be deemed TDRs as the pool, and not the individual loan, represents the unit of account.
	For further discussion of the Corporation's acquisitions and loan accounting, see Note 2 (Business Combinations), Note 4 (Loans), and Note 5 (Allowance for Loan and Lease Losses).
Equipment Lease Financing	'
	Equipment Lease Financing
	The Corporation leases equipment directly to customers. The net investment in financing leases includes the aggregate amount of lease payments to be received and the estimated residual values of the equipment, less unearned income. Income from lease financing is recognized over the lives of the leases on an approximate level rate of return on the unrecovered investment. The residual value represents the estimated fair value of the leased asset at the end of the lease term. Unguaranteed residual values of leased assets are reviewed at least annually for impairment. Declines in residual values determined to be other-than-temporary are recognized in earnings in the period such determinations are made.
Mortgage Servicing Rights	'
	Mortgage Servicing Rights
	The Corporation periodically sells residential real estate loans while retaining the rights and obligations to perform the servicing of such loans. Whenever the Corporation undertakes an obligation to service such loans, Management assesses whether a servicing asset or liability should be recognized. A servicing asset is recognized whenever the compensation for servicing is expected to exceed servicing costs. Likewise, a servicing liability would be recognized in the event that servicing fees to be received are not expected to adequately compensate the Corporation for its expected cost. Servicing assets associated with retained mortgage servicing rights are presented within other assets on the balance sheet. The Corporation does not presently have any servicing liabilities.
	MSRs are initially valued at fair value. Servicing assets and liabilities are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Amortization is recorded in loan sales and servicing income in the Consolidated Statement of Income.
	At each reporting period, MSRs are assessed for impairment based on fair value of those rights on a stratum-by-stratum basis. The Corporation stratifies its servicing rights portfolio into tranches based on loan type and interest rate, the predominant risk characteristics of the underlying loans. Any impairment is recognized through a valuation allowance for each impaired stratum through a charge to income. If the Corporation later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income.
	The Corporation also reviews MSRs for OTTI each quarter and recognizes a direct write-down when the recoverability of a recorded allowance for impairment is determined to be remote. Unlike an allowance for impairment, a direct write-down permanently reduces the unamortized cost of the MSR and the allowance for impairment.
	MSRs do not trade in an active open market with readily observable market prices. Although sales of MSRs do occur, the exact terms and conditions may not be available. As a result, the fair value of MSRs is estimated using discounted cash flow modeling techniques which require Management to make assumptions regarding future net servicing income, adjusted for such factors as net servicing income, discount rate and prepayments. The primary assumptions used in determining the current fair value of the Corporation's MSRs as well as a sensitivity analysis are presented in Note 7 (Mortgage Servicing Rights and Mortgage Servicing Activity).
	The Corporation generally records loan administration fees for servicing loans for investors on the accrual basis of accounting. Servicing fees and late fees related to delinquent loan payments are also recorded on the accrual basis of accounting.
Premises and Equipment	'
	For financial reporting purposes, premises and equipment, are reported at cost less accumulated depreciation and amortization and principally depreciated using the straight-line method over their estimated useful lives. Estimated useful lives for furniture and equipment range from three to 15 years, and depreciable buildings ranges from 10 to 35 years. Amortization of leasehold improvements is computed on the straight-line method based on related lease terms or the estimated useful lives of the assets of up to 15 years, whichever is shorter.
	The Corporation purchases, as well as internally develops and customizes, certain software to enhance or perform internal business functions. Software development costs incurred in the planning and post-development project stages are charged to noninterest expense. Costs associated with designing software configuration and interfaces, installation, coding programs and testing systems are capitalized and amortized using the straight-line method over periods ranging from three to seven years.
Goodwill and Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill represents the amount by which the cost of net assets acquired in a business combination exceeds their fair value. Other intangible assets represent the present value of the future stream of income to be derived from the purchase of core deposits. Other intangible assets are amortized on a straight-line basis over their estimated useful lives. Goodwill and other intangible assets deemed to have indefinite lives are not amortized.
	Goodwill is evaluated for impairment on an annual basis at November 30th of each year or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The Corporation's reporting units for purposes of this testing are its major lines of business: Commercial, Retail, and Wealth. The goodwill impairment test is a two-step process that requires management to make judgments in determining what assumptions to use in the calculation. The first step in impairment testing is to estimate the fair value of each reporting unit based on valuation techniques including a discounted cash flow model with revenue and profit forecasts and comparing those estimated fair values with the carrying values, which includes the allocated goodwill. If the carrying amount of a reporting unit exceeds its fair value, goodwill impairment may be indicated and a second step is performed to compute the amount of the impairment by determining an "implied fair value" of goodwill. The determination of a reporting unit's implied fair value of goodwill requires the Corporation to allocate fair value of the reporting unit to the assets and liabilities of the reporting unit. Any unallocated fair value represents the "implied fair value" of goodwill, which is compared to its corresponding carrying value. An impairment loss would be recognized as a charge to earnings to the extent the carrying amount of the reporting unit's goodwill exceeds the implied fair value of goodwill.
Other Real Estate Owned	'
	Other Real Estate Owned
	Other real estate owned is included in other assets in the consolidated balance sheets and is primarily comprised of property acquired through loan foreclosure proceedings or acceptance of a deed-in-lieu of foreclosures, and loans classified as in-substance foreclosure. Other real estate owned is recorded at the lower of the recorded investment in the loan at the time of transfer or the fair value of the underlying property collateral, less estimated selling costs. Any write-down in the carrying value of a property at the time of acquisition is charged to the allowance for loan losses. Any subsequent write-downs to reflect current fair market value, as well as gains and losses on disposition and revenues and expenses incurred in maintaining such properties, are treated as period costs. Other real estate owned also includes bank premises formerly but no longer used for banking. Banking premises are transferred at the lower of carrying value or estimated fair value, less estimated selling costs.
Derivative Instruments and Hedging Activites	'
	Derivative Instruments and Hedging Activities
	The Corporation uses interest rate swaps, interest rate lock commitments and forward contracts sold to hedge interest rate risk for asset and liability management purposes. All derivatives are recorded as either other assets or other liabilities at fair value. Credit risk associated with derivatives is reflected in the fair values recorded for those positions. Accounting for changes in fair value (i.e., gains or losses) of derivatives differs depending on whether the derivative has been designated and qualifies as part of a hedging relationship, and further, on the type of hedging relationship. For derivatives that are not designated as hedging instruments, the gain or loss is recognized immediately in other operating income. A derivative that is designated and qualifies as a hedging instrument must be designated a fair value hedge, a cash flow hedge or a hedge of a net investment in a foreign operation. The Corporation does not have any cash flow hedges or derivatives that hedge net investments in foreign operations.
	Effectiveness measures the extent to which changes in the fair value of a derivative instrument offset changes in the fair value of the hedged item. If the relationship between the change in the fair value of the derivative instrument and the fair value of the hedged item falls within a range considered to be the industry norm, the hedge is considered highly-effective and qualifies for hedge accounting. A hedge is ineffective if the offsetting difference between the fair values falls outside the acceptable range.
	A fair value hedge is used to limit exposure to changes in the fair value of existing assets, liabilities and firm commitments caused by changes in interest rates or other economic factors. The Corporation recognizes the gain or loss on these derivatives, as well as the related gain or loss on the underlying hedged item, in earnings during the period in which the fair value changes. If a hedge is perfectly effective, the change in the fair value of the hedged item will be offset, resulting in no net effect on earnings.
	A cash flow hedge is used to minimize the variability of future cash flows that is caused by changes in interest rates or other economic factors. The effective portion of a gain or loss on any cash flow hedge is reported as a component of accumulated other comprehensive income (loss) and reclassified into other operating income in the same period or periods that the hedged transaction affects earnings. Any ineffective portion of the derivative gain or loss is recognized in other operating income during the current period.
	The Corporation enters into commitments to originate mortgage loans whereby the interest rate on the prospective loan is determined prior to funding (rate lock commitments). Rate lock commitments on mortgage loans that are intended to be sold are considered to be derivatives. Accordingly, such commitments, along with any related fees received from potential borrowers, are recorded at fair value as derivative assets or liabilities, with changes in fair value recorded in net gain or loss on sale of mortgage loans.
Income Taxes	'
	Income Taxes
	Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between the carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized.
	A tax position is recognized as a benefit only if it is "more likely than not" that the tax position would be sustained in a tax examination, with a tax being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the "more likely than not" test, no tax benefit is recorded.
	The Corporation follows the asset and liability method of accounting for income taxes. Deferred income taxes are recognized for the tax consequences of "temporary differences" by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities. The effect of a change in tax rates is recognized in income in the period of enactment date.
	In assessing the realizability of deferred tax assets, Management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Assessing the need for, or the sufficiency of, a valuation allowance requires Management to evaluate all available evidence, both negative and positive, including the recent trend of quarterly earnings. Positive evidence necessary to overcome the negative evidence includes whether future taxable income in sufficient amounts and character within the carryback and carryforward periods is available under the tax law, including the use of tax planning strategies. When negative evidence (e.g., cumulative losses in recent years, history of operating loss or tax credit carryforwards expiring unused) exists, more positive evidence than negative evidence will be necessary.
	Additional information regarding income taxes is included in Note 12 (Income Taxes).
Treasury Stock	'
	Treasury Stock
	Treasury stock is accounted for using the cost method in which reacquired shares reduce outstanding Common Stock and capital surplus. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock on the last-in, first-out basis.
Per Share Data	'
	Per Share Data
	Basic net income per common share is calculated using the two-class method to determine income attributable to common shareholders. The two-class method is an earnings allocation formula that determines earnings per share for each share of common stock and participating securities according to dividends declared (distributed earnings) and participation rights in undistributed earnings. Distributed and undistributed earnings are allocated between common and participating security shareholders based on their respective rights to receive dividends. Unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities (i.e., nonvested restricted stock). Undistributed net losses are not allocated to nonvested restricted shareholders, as these shareholders do not have a contractual obligation to fund the losses incurred by the Corporation. Net income attributable to Common Stock are then divided by the weighted-average number of Common Stock outstanding during the period.
	Diluted net income per common share is calculated under the more dilutive of either the treasury method or two-class method. For the diluted calculation, the weighted-average number of shares of Common Stock outstanding by the assumed conversion of outstanding convertible preferred stock from the beginning of the year or date of issuance, if later, and the number of shares of Common Stock that would be issued assuming the exercise of stock options and warrants using the treasury stock method. The treasury stock method assumes that the Corporation uses the proceeds from a hypothetical exercise of any options and warrants to repurchase Common Stock at the average market price during the period. These adjustments to the weighted-average number of shares of Common Stock outstanding are made only when such adjustments will dilute earnings per common share.
	All earnings per share disclosures appearing in these financial statements, related notes and management's discussion and analysis, are computed assuming dilution unless otherwise indicated. The Corporation's earnings per share calculations are illustrated in Note 20 (Shareholders' Equity) under the heading "Earnings per Share.
Trust Department Assets and Income	'
	Trust Department Assets and Income
	Property held by the Corporation in a fiduciary or other capacity for trust customers is not included in the accompanying consolidated financial statements, since such items are not assets of the Corporation. Trust department income is reported on the accrual basis of accounting.
Share-Based Compensation	'
	Share-Based Compensation
	The Corporation's share-based compensation plans are described in detail in Note 14 (Share-Based Compensation). The Corporation recognizes share-based compensation expense using the straight-line method over the requisite service period for all stock awards, including those with graded vesting. The requisite service period is the period an employee is required to provide service in order to vest in the award, which cannot extend beyond the date at which the employee is no longer required to perform any service to receive the share-based compensation (the retirement-eligible date). Certain awards are contingent upon performance conditions, which affect the number of awards ultimately granted. The Corporation periodically evaluates the probable outcome of the performance conditions and makes cumulative adjustments to compensation expense as appropriate.
Pension and Other Postretirement Plans	'
	Pension and Other Postretirement Plans
	Pension and other postretirement costs are based on assumptions concerning future events that will affect the amount and timing of required benefit payments under the Corporation's plans. These assumptions include demographic assumptions such as retirement age and mortality, a compensation rate increase, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic benefit cost includes service and interest cost based on the assumed discount rate, an expected return on plan assets based on an actuarially derived market-related value and amortization of prior service cost and net actuarial gains or losses. The amortization of any prior service costs is determined using a straight line amortization of the cost over the average remaining lifetime of participants expected to receive benefits under the plans. Actuarial gains and losses include the impact of plan amendments and various unrecognized gains and losses which are deferred and amortized over the future service periods of active employees. The overfunded or underfunded status of the plans is recorded as an asset or liability, respectively, in the Consolidated Balance Sheet, with changes in that status recognized through other comprehensive income. Additional information about pension and other postretirement plans is included in Note 13 (Benefit Plans).
Fair Value Measurement	'
	Fair Value Measurement
	Fair value is defined as the price to sell an asset or transfer a liability in an orderly transaction between market participants. It represents an exit price at the measurement date. Market participants are buyers and sellers, who are independent, knowledgeable, and willing and able to transact in the principal (or most advantageous) market for the asset or liability being measured. Current market conditions, including imbalances between supply and demand, are considered in determining fair value. The Corporation values its assets and liabilities in the principal market where it sells the particular asset or transfers the liability with the greatest volume and level of activity. In the absence of a principal market, the valuation is based on the most advantageous market for the asset or liability (i.e., the market where the asset could be sold or the liability transferred at a price that maximizes the amount to be received for the asset or minimizes the amount to be paid to transfer the liability).
	In measuring the fair value of an asset, the Corporation assumes the highest and best use of the asset by a market participant to maximize the value of the asset, and does not consider the intended use of the asset.
	When measuring the fair value of a liability, the Corporation assumes that the nonperformance risk associated with the liability is the same before and after the transfer. Nonperformance risk is the risk that an obligation will not be satisfied and encompasses not only the Corporation's own credit risk (i.e., the risk that the Corporation will fail to meet its obligation), but also other risks such as settlement risk. The Corporation considers the effect of its own credit risk on the fair value for any period in which fair value is measured.
	There are three acceptable valuation techniques that can be used to measure fair value: the market approach, the income approach and the cost approach. Selection of the appropriate technique for valuing a particular asset or liability takes into consideration the exit market, the nature of the asset or liability being valued, and how a market participant would value the same asset or liability. Ultimately, determination of the appropriate valuation method requires significant judgment, and sufficient knowledge and expertise are required to apply the valuation techniques.
	Valuation inputs refer to the assumptions market participants would use in pricing a given asset or liability using one of the three valuation techniques. Inputs can be observable or unobservable. Observable inputs are those assumptions which market participants would use in pricing the particular asset or liability. These inputs are based on market data and are obtained from a source independent of the Corporation. Unobservable inputs are assumptions based on the Corporation's own information or estimate of assumptions used by market participants in pricing the asset or liability. Unobservable inputs are based on the best and most current information available on the measurement date. All inputs, whether observable or unobservable, are ranked in accordance with a prescribed fair value hierarchy which gives the highest ranking to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest ranking to unobservable inputs (Level 3). Fair values for assets or liabilities classified as Level 2 are based on one or a combination of the following factors: (i) quoted prices for similar assets; (ii) observable inputs for the asset or liability, such as interest rates or yield curves; or (iii) inputs derived principally from or corroborated by observable market data. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Corporation considers an input to be significant if it drives 10% or more of the total fair value of a particular asset or liability.
	Assets and liabilities are considered to be fair valued on a recurring basis if fair value is measured regularly (i.e., daily, weekly, monthly or quarterly). Recurring valuation occurs at a minimum on the measurement date. Assets and liabilities are considered to be fair valued on a nonrecurring basis if the fair value measurement of the instrument does not necessarily result in a change in the amount recorded on the balance sheet. Generally, nonrecurring valuation is the result of the application of other accounting pronouncements which require assets or liabilities to be assessed for impairment or recorded at the lower of cost or fair value. The fair value of assets or liabilities transferred in or out of Level 3 is measured on the transfer date, with any additional changes in fair value subsequent to the transfer considered to be realized or unrealized gains or losses. Additional information regarding fair value measurements is provided in Note 17 (Fair Value Measurement).
Reclassifications	'
	Reclassifications
	Certain reclassifications of prior years' amounts have been made to conform to current year presentation. Such reclassifications had no effect on prior year net income or shareholders' equity.
New Accounting Pronouncements and Changes in Accounting Principles	'
New Accounting Pronouncements, Policy	'
	) Recently Adopted and Issued Accounting Standards
	The following section discusses new accounting policies that were adopted by the Corporation during 2013 and the expected impact of accounting standards recently issued but not yet required to be adopted. To the extent the adoption of new accounting standards materially affects financial condition, results of operations, or liquidity, the impacts are discussed in the applicable notes to the consolidated financial statements as referenced below.
	FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 amends the guidance in ASC 310-40 by clarifying when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan. Additionally, the amendments require interim and annual disclosure of both 1) the amount of foreclosed residential real estate property held by the creditor and 2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in ASU 2014-04 are effective for annual periods, and interim period within those annual periods, beginning after December 15, 2014. The amendments can either be adopted using a modified retrospective or a prospective transition method. The adoption of this accounting guidance is not expected to have a material effect on the Corporation's financial position or results of operations.
	FASB ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. Prior to this ASU, a reporting entity that invests in a qualified affordable housing project could elect to account for their investments using the effective yield method, if certain conditions were met, or for those investments that were not accounted for using the effective yield method, it was required that they be accounted for either using the equity or cost method. The amendments in ASU 2014-01 do not change the existing accounting methods, but permit reporting entities to make an accounting policy election to account for their investments in qualified affordable projects using the proportional amortization method, if certain conditions are met. The amendments in ASU 2014-01 are effective for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014, and should be applied retrospectively to all periods presented. The Corporation is in the process of analyzing its current accounting policy, but does not expect that a change to its current accounting policy will have a material impact on the Corporation's financial condition or results of operations.
	FASB ASU 2013-11, Preparation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. Prior to this ASU, U.S. GAAP did not include explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This ASU requires, with limited exception, that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a DTA for a net operating loss carryforward, or similar tax loss, or a tax credit carryforward. The amendments in ASU 2013-11 are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, and should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Since the Corporation does not currently have unrecognized tax benefits, this ASU will not have an effect on the Corporation's financial position or results of operations.
	FASB ASU 2013-10, Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes (a consensus of the Emerging Issues Task Force). The ASU permits the Fed Funds Effective Swap Rate (OIS) to be used as a benchmark interest rate for hedge accounting purposes, in addition to U.S. Treasury rates and LIBOR. The amendments also remove the restriction on using different benchmark rates for similar hedges. The ASU was effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The ASU has no impact on the Corporation's current hedging relationships and, thus, no impact on the Corporation's consolidated financial statements.
	FASB ASU 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. ASU 2013-02 amends the guidance on ASC 220-10 by requiring an entity to provide information about the amounts reclassified out of AOCI by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. The Corporation adopted this ASU effective January 1, 2013 and has incorporated this new disclosure information into Note 21 (Changes and Reclassifications Out of Accumulated Other Comprehensive Income).
	FASB ASU 2012-06, Business Combinations: Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution (a consensus of the FASB Emerging Issues Task Force). ASU 2012-06 amends the guidance in ASU 805-20 on the recognition of an indemnification asset as a result of a government-assisted acquisition of a financial institution when a subsequent change in the cash flows expected to be collected on the indemnification asset occurs (as a result of a change in cash flows expected to be collected on the assets subject to indemnification). A subsequent change in the measurement of the indemnification asset is to be accounted for on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value are limited to the contractual term of the indemnification agreement (that is, the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets). The Corporation adopted this ASU effective January 1, 2013, and the adoption did not have a significant impact on the Corporation's consolidated financial statements.
	FASB ASU 2011-11, Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 amends the guidance in ASC 210, Balance Sheet, to require an entity to disclose information about offsetting and related arrangements to enable users of an entity's financial statements to evaluate the effect or potential effect of netting arrangements. In January 2013, the FASB issued ASU 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities, which more narrowly defined the scope of financial instruments to only derivatives, repurchase and reverse purchase agreements, and securities borrowing and lending transactions. The Corporation adopted these ASUs as of January 1, 2013, and the adoption did not have a significant impact on the Corporation's consolidated financial statements. The newly required disclosures are incorporated into Note 18 (Derivatives and Hedging Activity).

Business_Combinations_Business

Business Combinations Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The Citizens transaction was accounted for using the acquisition method of accounting and, as such, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the Acquisition Date. All acquired loans were also recorded at fair value. No allowance for loan losses was carried over and no allowance was created at Acquisition Date. Per the acquisition method of accounting, these fair values are preliminary and subject to refinement for up to one year after the Acquisition Date as additional information relative to closing date fair values become available.
	The following table provides the preliminary purchase price calculation as of the Acquisition Date and the identifiable assets purchased and the liabilities assumed at their estimated fair value. These fair value measurements are provisional based on third-party valuations that are currently under review.
	Purchase Price:
	FirstMerit shares of Common Stock issued for Citizens' shares					55,468,283
	Closing price per share of the Corporation's Common Stock on April 12, 2013					$	16.68
	Consideration from Common Stock conversion (1.37 ratio)					925,211
	Cash paid to the Treasury for Citizens' TARP Preferred					355,371
	Cash paid in lieu of fractional shares to the former Citizens' shareholders					61
	Consideration from the warrant issued to the Treasury for Citizens' TARP warrant					3,000
	Total purchase price					$	1,283,643
	Preliminary Statement of Net Assets Acquired at Fair Value:
	ASSETS
	Cash and due from banks		$	544,380
	Investment Securities		3,202,575
	Loans		4,617,004
	Premises and equipment		138,536
	Intangible assets		84,774		1
	Accrued interest receivable and other assets		680,020
	Total assets		$	9,267,289
	LIABILITIES
	Deposits		$	7,276,754
	Borrowings		908,824
	Accrued taxes, expenses, and other liabilities		77,843
	Total liabilities		$	8,263,421
	Net identifiable assets acquired					1,003,868
	Goodwill					$	279,775
	1 - Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful lives for which the core deposit intangible and the trust relationships are being amortized over are 15 years and 12 years, respectively.
Acquired Impaired and Non-Impaired Loans at Acquisition Date	'
	The following table summarizes the provisional fair value of both acquired impaired and nonimpaired loans by product type as of the Acquisition Date.
		Acquired Impaired Loans			Acquired Nonimpaired Loans			Acquired Loans Total
	Commercial
	C&I	$	93,735		$	1,660,199		$	1,753,934
	CRE	378,569			359,066			737,635
	Construction	13,399			17,135			30,534
	Total commercial	485,703			2,036,400			2,522,103
	Consumer
	Residential mortgages	232,291			278,404			510,695
	Installment	54,108			1,165,235			1,219,343
	Home equity lines	47,613			317,250			364,863
	Total consumer	334,012			1,760,889			2,094,901
	Total	$	819,715		$	3,797,289		$	4,617,004
Acquired Non-impaired Loans Fair Value at Acquisition Date	'
	For acquired nonimpaired loans, the difference between the Acquisition Date fair value and the contractual amounts due at the Acquisition Date represents the fair value adjustment. Fair value adjustments may be discounts (or premiums) to a loan's cost basis and are accreted (or amortized) to interest income over the the loan's remaining life using the level yield method. Acquired nonimpaired loans are reported net of the unamortized fair value adjustment in the Consolidated Balance Sheet. The fair value adjustment for acquired nonimpaired loans as of the Acquisition Date is presented in the following table.
		Acquired Nonimpaired Loans
	Outstanding balance	$	4,017,304
	Less: Fair value adjustment	220,015
	Fair value of acquired nonimpaired loans	$	3,797,289
Nonimpaired Loans Cash Flows Reconciliation at Acquisition Date	'
	The table below details contractually required payments, cash flows not expected to be collected and cash flows expected to be collected on acquired nonimpaired loans as of the Acquisition Date.
		Acquired Nonimpaired Loans
	Contractually required payments including interest (a)	$	4,955,180
	Less: Contractual cash flows not expected to be collected	680,664
	Cash flows expected to be collected	$	4,274,516
	(a) - Total undiscounted amounts of all uncollected contractual principal and interest, including any fees and penalties, both past due and scheduled for the future, assuming no loss or prepayment.
Reconciliation of Carrying Amount of Acquired Impaired Loans	'
	A reconciliation of the contractual required payments to the fair value of the acquired impaired loans at the Acquisition Date is as follows:
		Acquired Impaired Loans
	Contractually required payments including interest (a)	$	1,231,172
	Nonaccretable difference (b)	(279,899		)
	Cash flows expected to be collected (c)	951,273
	Accretable yield (d)	(131,558		)
	Fair value of loans acquired	$	819,715
Business Acquisition, Pro Forma Information	'
	The following table provides the unaudited pro forma information for the results of operations for the years ended December 31, 2013 and 2012, as if the acquisition had occurred January 1 of each year. These adjustments include the impact of certain purchase accounting adjustments including accretion of loan marks, which makes up the vast majority of the adjustments, followed by intangible assets amortization, investment securities amortization, fixed assets depreciation and deposit accretion. In addition, the $75.1 million in year to date merger-related expenses previously discussed are included in each period presented. The Corporation expects to achieve further operating cost savings and other business synergies as a result of the acquisition which are not reflected in the pro forma amounts. These unaudited pro forma results are presented for illustrative purposes and are not intended to represent or be indicative of the actual results of operations of the combined corporation that would have been achieved had the acquisition occurred at the beginning of each period presented, nor are they intended to represent or be indicative of future results of operations.
			(Unaudited)
			Year Ended December 31,
			2013			2012
	Total revenue, net of interest expense		$	1,096,960		$	1,254,594
	Net income		196,744			609,259
	Note: 2012 net income includes approximately $276.8 million of tax benefits as a result of Citizens reversal of its valuation allowance on its DTA.

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
amortized cost and fair value for the major categories of held-to-maturity and available-for-sale securities	'
	The following tables provide the amortized cost and fair value for the major categories of held-to-maturity and available-for-sale securities. Held-to-maturity securities are carried at amortized cost, which reflects historical cost, adjusted for amortization of premiums and accretion of discounts. Available-for-sale securities are carried at fair value with net unrealized gains or losses reported on an after-tax basis as a component of other comprehensive income in shareholders' equity.
			December 31, 2013
			Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	258,787			$	7,376			$	(3,796	)		$	262,367
		Residential mortgage-backed securities:
		U.S. government agencies	962,687				21,662				(14,427		)		969,922
		Commercial mortgage-backed securities:
		U.S. government agencies	72,048				7				(2,488		)		69,567
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,566,262				4,199				(52,068		)		1,518,393
		Nonagency	9				—				—				9
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	104,152				273				(2,157		)		102,268
		Asset-backed securities:
		Collateralized loan obligations	297,259				760				(4,332		)		293,687
		Corporate debt securities	61,596				—				(10,952		)		50,644
		Total debt securities	3,322,800				34,277				(90,220		)		3,266,857
	Equity Securities
		Marketable equity securities	3,036				—				—				3,036
		Nonmarketable equity securities	3,281				—				—				3,281
		Total equity securities	6,317				—				—				6,317
		Total securities available for sale	$	3,329,117			$	34,277			$	(90,220	)		$	3,273,174
	Securities held-to-maturity
	Debt securities
		U.S. treasuries	$	5,000			$	4			$	—			$	5,004
		U.S. government agency debentures	25,000				—				(1,348		)		23,652
		U.S. states and political subdivisions	480,703				5,335				(10,459		)		475,579
		Residential mortgage-backed securities:
		U.S. government agencies	569,960				1,108				(11,617		)		559,451
		Commercial mortgage-backed securities:
		U.S. government agencies	56,596				—				(1,190		)		55,406
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,464,732				—				(81,818		)		1,382,914
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	240,069				6				(11,052		)		229,023
		Corporate debt securities	93,628				308				(725		)		93,211
		Total securities held to maturity	$	2,935,688			$	6,761			$	(118,209	)		$	2,824,240
			December 31, 2012
			Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	253,198			$	15,235			$	(229	)		$	268,204
		Residential mortgage-backed securities:
		U.S. government agencies	1,058,005				49,058				—				1,107,063
		Commercial mortgage-backed securities:
		U.S. government agencies	52,014				428				(406		)		52,036
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,311,501				18,180				(260		)		1,329,421
		Nonagency	11				—				—				11
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	109,260				2,221				(138		)		111,343
		Corporate debt securities	61,541				—				(11,889		)		49,652
		Total debt securities	2,845,530				85,122				(12,922		)		2,917,730
		Marketable equity securities	3,241				—				—				3,241
		Total securities available for sale	$	2,848,771			$	85,122			$	(12,922	)		$	2,920,971
	Securities held-to-maturity
	Debt securities
		U.S. states and political subdivisions	$	270,005			$	5,126			$	(70	)		$	275,061
		Commercial mortgage-backed securities:													—
	U.S. government agencies	33,165				812				—				33,977
	Residential collateralized mortgage-backed securities:													—
	U.S. government agencies	123,563				533				(16		)		124,080
	Commercial collateralized mortgage-backed securities:													—
	U.S. government agencies	98,924				772				—				99,696
	Corporate debt securities	96,464				1,521				—				97,985
	Total securities held to maturity	$	622,121			$	8,764			$	(86	)		$	630,799
Schedule of general obligation bonds	'
	The Corporation's U.S. states and political subdivisions portfolio is composed of general obligation bonds issued by a highly diversified number of states, cities, counties, and school districts. Additionally, the aggregate fair value of the Corporation's general obligation bonds was greater than $10 million in 12 of the 38 U.S. states in which it holds investments. The amortized cost and fair value of the Corporation's portfolio of general obligation bonds are summarized by U.S. state in the tables below.
		December 31, 2013
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Ohio	154			1,041				159,674				160,265
	Michigan	166			744				122,198				123,571
	Illinois	75			1,314				96,863				98,521
	Texas	69			771				54,295				53,204
	Wisconsin	87			645				54,921				56,152
	Pennsylvania	51			891				48,319				45,451
	Minnesota	45			663				29,840				29,816
	Washington	30			930				28,393				27,906
	New Jersey	38			722				27,101				27,440
	Missouri	20			969				19,253				19,382
	New York	22			585				13,064				12,878
	California	18			599				10,651				10,788
	Other	115			631				74,918				72,572
	Total general obligation bonds	890			$	829			$	739,490			$	737,946
		December 31, 2012
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Ohio	127			$	1,167			$	144,789			$	148,264
	Illinois	42			1,366				55,207				57,365
	Pennsylvania	55			970				51,932				53,348
	Texas	53			931				47,613				49,326
	Wisconsin	28			1,096				28,572				30,687
	Minnesota	40			719				27,348				28,756
	New Jersey	33			856				26,541				28,232
	Michigan	22			1,233				26,104				27,130
	Washington	22			907				18,976				19,958
	Missouri	10			1,482				13,809				14,815
	New York	18			639				11,027				11,507
	California	11			930				9,734				10,231
	Other	85			742				61,551				63,646
	Total general obligation bonds	546			$	994			$	523,203			$	543,265
Schedule of other investments	'
	FRB and FHLB stock constitute the majority of other investments on the Consolidated Balance Sheet.
		December 31,
		2013				2012
	FRB stock	$	55,294			$	21,045
	FHLB stock	125,032				119,145
	Other	477				527
	Total other investments	$	180,803			$	140,717
Schedule of Realized Gain (Loss)	'
	The following table presents the proceeds from sales of available-for-sale securities and the gross realized gains and losses on the sales of those securities that have been included in earnings as a result of those sales. Gains or losses on the sales of available-for-sale securities are recognized upon sale and are determined using the specific identification method.
		Years Ended December 31,
		2013				2012				2011
	Realized gains	$	3,786			$	3,786			$	11,251
	Realized losses	(6,589		)		—				(170		)
	Net securities (losses)/gains	$	(2,803	)		$	3,786			$	11,081
Schedule of Unrealized Loss on Investment	'
	The following table presents the gross unrealized losses and fair value of securities in the securities available-for-sale portfolio by length of time that individual securities in each category had been in a continuous loss position.
			December 31, 2013
			Less than 12 months											12 months or longer											Total
			Fair Value				Unrealized				Number			Fair Value				Unrealized				Number			Fair Value				Unrealized
							Losses				Impaired							Losses				Impaired							Losses
											Securities											Securities
	Securities available-for-sale
		Debt Securities
		U.S. states and political subdivisions	$	38,039			$	(1,996	)		65			$	14,157			$	(1,800	)		25			$	52,196			$	(3,796	)
		Residential mortgage-backed securities:
		U.S. government agencies	434,761				(13,109		)		35			14,890				(1,318		)		2			449,651				(14,427		)
		Commercial mortgage-backed securities:
		U.S. government agencies	33,387				(1,491		)		5			16,944				(997		)		2			50,331				(2,488		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,135,151				(44,775		)		74			100,530				(7,293		)		7			1,235,681				(52,068		)
		Nonagency	—				—				—			1				—				1			1				—
		Commercial collateralized mortgage-backed securities:
		U.S. Government agencies	43,747				(2,055		)		6			2,525				(102		)		1			46,272				(2,157		)
		Collateralized loan obligations:
		Nonagency	223,458				(4,332		)		33			—				—				—			223,458				(4,332		)
		Corporate debt securities	—				—				—			50,644				(10,952		)		8			50,644				(10,952		)
		Total available-for-sale securities	$	1,908,543			$	(67,758	)		218			$	199,691			$	(22,462	)		46			$	2,108,234			$	(90,220	)
	Securities held-to-maturity
		Debt Securities
		U.S. government agency debentures	$	23,652			$	(1,348	)		1			$	—			$	—			—			$	23,652			$	(1,348	)
		U.S. states and political subdivisions	222,154				(10,276		)		353			2,478				(183		)		6			224,632				(10,459		)
		Residential mortgage-backed securities:
		U.S. government agencies	422,192				(11,617		)		22			—				—				—			422,192				(11,617		)
		Commercial mortgage-backed securities:
		U.S. government agencies	48,831				(1,190		)		8			—				—				—			48,831				(1,190		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,402,172				(82,558		)		67			—				—				—			1,402,172				(82,558		)
		Nonagency	—				—				—			—				—				—			—				—
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	189,606				(10,312		)		18			—				—				—			189,606				(10,312		)
		Collateralized loan obligations:
		Nonagency	—				—				—			—				—				—			—				—
		Corporate debt securities	64,541				(725		)		23			—				—				—			64,541				(725		)
		Total held-to-maturity securities	$	2,373,148			$	(118,026	)		492			$	2,478			$	(183	)		6			$	2,375,626			$	(118,209	)
			31-Dec-12
			Less than 12 months											12 months or longer											Total
			Fair Value				Unrealized				Number			Fair Value				Unrealized				Number			Fair Value				Unrealized
							Losses				Impaired							Losses				Impaired							Losses
											Securities											Securities
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	14,110			$	(229	)		24			$	—			$	—			—			$	14,110			$	(229	)
		Residential mortgage-backed securities:
		U.S. government agencies	14				—				1			13				—				1			27				—
		Commercial mortgage-backed securities:
		U.S. government agencies	31,237				(406		)		3			—				—				—			31,237				(406		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	133,008				(258		)		9			389				(2		)		1			133,397				(260		)
		Nonagency	—				—				—			2				—				1			2				—
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	35,316				(138		)		4			—				—				—			35,316				(138		)
		Corporate debt securities	—				—				—			49,652				(11,889		)		8			49,652				(11,889		)
		Total available-for-sale securities	$	213,685			$	(1,031	)		41			$	50,056			$	(11,891	)		11			$	263,741			$	(12,922	)
	Securities held-to-maturity
	Debt securities
		U.S. states and political subdivisions	$	6,543			$	(70	)		12			$	—			$	—			—			$	6,543			$	(70	)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	17,413				(16		)		1			—				—				—			17,413				(16		)
	Total held-to-maturity securities	$	23,956			$	(86	)		13			$	—			$	—			—			$	23,956			$	(86	)
Investment Securities Maturities [Table Text Block]	'
			U.S. Government agency debentures				U.S. Treasuries				U.S. States and political subdivisions obligations				Residential mortgage-backed securities - U.S. govt. agency obligations				Commercial mortgage-backed securities - U.S. govt. agency obligations				Residential collateralized mortgage obligations - U.S. govt. agency obligations				Residential collateralized mortgage obligations - non- U.S. govt. agency issued				Commercial collateralized mortgage obligations - U.S. govt. agency obligations			Collateralized loan obligations			Corporate debt securities			Total			Weighted Average Yield
	Securities Available for Sale
	Remaining maturity:
	One year or less		$	—			$	—			$	11,901			$	1,555			$	16,944			$	4,830			$	—			$	—		$	24,551		$	—		$	59,781		3.1	%
	Over one year through five years		—				—				53,498				768,747				19,237				1,245,303				9				79,688			39,839			—			2,206,321			2.24	%
	Over five years through ten years		—				—				166,913				199,620				33,386				268,260				—				22,580			208,319			—			899,078			2.85	%
	Over ten years		—				—				30,055				—				—				—				—				—			20,978			50,644			101,677			2.26	%
	Fair Value		$	—			$	—			$	262,367			$	969,922			$	69,567			$	1,518,393			$	9			$	102,268		$	293,687		$	50,644		$	3,266,857		2.42	%
	Amortized Cost		$	—			$	—			$	258,787			$	962,687			$	72,048			$	1,566,262			$	9			$	104,152		$	297,259		$	61,596		$	3,322,800
	Weighted-Average Yield		—		%		—		%		5.1		%		2.75		%		2.09		%		1.86		%		3.65		%		1.65		%	2.66		%	0.96		%	2.42		%
	Weighted-Average Maturity		—				—				6.95				4.21				3.99				4.22				1.81				4.4			6.21			13.81			4.79
	Securities Held to Maturity
	Remaining maturity:
	One year or less		$	—			$	—			$	75,261			$	—			$	—			$	—			$	—			$	—		$	—		$	—		$	75,261		1.5	%
	Over one year through five years		—				5,004				45,746				351,715				15,007				1,105,292				—				115,870			—			93,211			1,731,845			1.78	%
	Over five years through ten years		23,652				—				180,337				207,736				40,399				277,622				—				113,153			—			—			842,899			2.38	%
	Over ten years		—				—				174,235				—				—				—				—				—			—			—			174,235			5.4	%
	Fair Value		$	23,652			$	5,004			$	475,579			$	559,451			$	55,406			$	1,382,914			$	—			$	229,023		$	—		$	93,211		$	2,824,240		2.17	%
	Amortized Cost		$	25,000			$	5,000			$	480,703			$	569,960			$	56,596			$	1,464,732			$	—			$	240,069		$	—		$	93,628		$	2,935,688
	Weighted-Average Yield		1.43		%		0.26		%		4.72		%		2.12		%		1.79		%		1.56		%		—		%		2.27		%	—		%	2.22		%	2.17		%
	Weighted-Average Maturity		5.83				1.08				10.96				5.31				5.65				4.59				—				5.23			—			4.04			5.5

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Total originated, acquired and covered loans outstanding table	'
	Loans outstanding as of December 31, 2013 and 2012, net of unearned income, consisted of the following:
			December 31, 2013				December 31, 2012
	Originated loans (a):
	Commercial		$	6,648,279			$	5,866,489
	Residential mortgage		529,253				445,211
	Installment		1,727,925				1,328,258
	Home equity		920,066				806,078
	Credit cards		148,313				146,387
	Leases		239,551				139,236
		Total originated loans (a)	10,213,387				8,731,659
	Allowance for originated loan losses		(96,484		)		(98,942		)
		Net originated loans	$	10,116,903			$	8,632,717
	Acquired loans:
	Commercial		$	1,725,970			$	—
	Residential mortgage		470,652				—
	Installment		1,004,569				—
	Home equity		294,424				—
		Total acquired loans	3,495,615				—
	Allowance for acquired loan losses		(741		)		—
		Net acquired loans	$	3,494,874			$	—
	Covered loans:
	Commercial		375,860				718,437
	Residential mortgage		50,679				61,540
	Installment		6,162				8,189
	Home equity		97,442				117,225
	Loss share receivable		61,827				113,734
		Total covered loans	591,970				1,019,125
	Allowance for covered loan losses		(44,027		)		(43,255		)
		Net covered loans	$	547,943			$	975,870
	Total loans:
	Commercial		$	8,750,109			$	6,584,926
	Residential mortgage		1,050,584				506,751
	Installment		2,738,656				1,336,447
	Home equity		1,311,932				923,303
	Credit cards		148,313				146,387
	Leases		239,551				139,236
	Loss share receivable		61,827				113,734
		Total loans	14,300,972				9,750,784
	Total allowance for loan losses		(141,252		)		(142,197		)
		Total Net loans	$	14,159,720			$	9,608,587
	(a) Includes acquired FirstBank loans of $49.2 million and $54.2 million as of December 31, 2013 and 2012, respectively.
Summary of loans to related parties table	'
	An analysis of loan activity with related parties for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:
		Year Ended December 31,
		2013				2012				2011
	Aggregate amount at beginning of year	$	16,578			$	15,629			$	15,723
	New loans	11,507				3,500				2,458
	Repayments	(4,374		)		(2,739		)		(2,552		)
	Changes in directors and their affiliations	825				188				—
	Aggregate amount at end of year	$	24,536			$	16,578			$	15,629
Changes in the Carrying Amount of Accretable Yield for Acquired Impaired Loans [Table Text Block]	'
	Total outstanding acquired impaired loans as of December 31, 2013 were $817.6 million. Changes in the carrying amount and accretable yield for acquired impaired loans were as follows for the year end December 31, 2013:
		Year Ended
		December 31, 2013
	Acquired Impaired Loans	Accretable Yield				Carrying Amount of Loans
	Balance at beginning of period	$	—			$	—
	Additions due to Citizens acquisition on April 12, 2013	131,558				819,715
	Accretion	(27,144		)		27,144
	Net reclassifications from nonaccretable to accretable	46,361				—
	Payments received, net	—				(245,859		)
	Disposals	(14,129		)		—
	Balance at end of period	$	136,646			$	601,000
Changes in Loss Share Receivable Associated with Covered Loans	'
	Changes in the loss share receivable associated with covered loans for the years ended December 31, 2013 and 2012, respectively, were as follows:
		Year Ended
	Loss Share Receivable	December 31, 2013				December 31, 2012
	Balance at beginning of period	$	113,734			$	205,664
	Amortization	(24,307		)		(34,903		)
	Increase due to impairment on covered loans	10,790				14,728
	FDIC reimbursement	(27,234		)		(58,099		)
	Covered loans paid in full	(11,156		)		(13,656		)
	Balance at end of period	$	61,827			$	113,734
Changes in Carrying Amount of Accretable Yield for Covered Impaired Loans	'
	Changes in the carrying amount and accretable yield for covered impaired loans were as follows for the years ended December 31, 2013 and 2012:
		Year Ended December 31,
		2013								2012
	Covered Impaired Loans	Accretable				Carrying				Accretable			Carrying
		Yield				Amount of				Yield			Amount of
						Loans							Loans
	Balance at beginning of period	$	113,288			$	762,386			$	176,736		$	1,128,978
	Accretion	(64,528		)		64,528				(96,748		)	96,748
	Net reclassifications from nonaccretable to accretable	34,965				—				38,177			—
	Payments received, net	—				(423,222		)		—			(463,340		)
	Disposals	(16,442		)		—				(4,877		)	—
	Balance at end of period	$	67,283			$	403,692			$	113,288		$	762,386
Past Due Financing Receivables	'
	The following tables provide a summary of loans by portfolio type, including the delinquency status of those loans that continue to accrue interest and those loans that are nonaccrual:
	As of December 31, 2013
	Originated Loans																			≥ 90 Days
		Days Past Due											Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (a)		Loans
	Commercial
	C&I	$	8,941			$	994			$	10,622		$	20,557		$	4,119,010	$	4,139,567	$	151	$	11,323
	CRE	4,507				2,400				9,688			16,595			2,153,192		2,169,787		460		14,229
	Construction	351				21				66			438			338,487		338,925		—		122
	Leases	902				—				—			902			238,649		239,551		—		—
	Consumer
	Installment	15,433				4,050				4,462			23,945			1,703,980		1,727,925		3,735		3,681
	Home equity lines	1,864				918				965			3,747			916,319		920,066		418		1,819
	Credit cards	729				471				735			1,935			146,378		148,313		404		558
	Residential mortgages	19,858				2,072				9,350			31,280			497,973		529,253		6,008		10,471
	Total	$	52,585			$	10,926			$	35,888		$	99,399		$	10,113,988	$	10,213,387	$	11,176	$	42,203
	Acquired Loans																			≥ 90 Days
		Days Past Due											Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing		Loans
	Commercial
	C&I	$	1,295			$	862			$	3,744		$	5,901		$	788,178	$	794,079	$	40	$	795
	CRE	5,603				5,281				26,366			37,250			881,395		918,645		403		651
	Construction	2,675				—				—			2,675			10,571		13,246		—		—
	Consumer
	Installment	14,528				4,076				3,354			21,958			982,611		1,004,569		2,263		679
	Home equity lines	4,774				1,933				3,606			10,313			284,111		294,424		1,039		1,300
	Residential Mortgages	3,918				1,426				8,063			13,407			457,245		470,652		403		582
	Total	$	32,793			$	13,578			$	45,133		$	91,504		$	3,404,111	$	3,495,615	$	4,148	$	4,007
	Covered Loans (b)																			≥ 90 Days
		Days Past Due											Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (c)		Loans (c)
	Commercial
	C&I	$	836			$	1,489			$	12,957		$	15,282		$	60,955	$	76,237
	CRE	2,855				3,443				103,077			109,375			164,219		273,594
	Construction	2,191				1,917				20,388			24,496			1,533		26,029
	Consumer
	Installment	33				—				—			33			6,130		6,163
	Home equity lines	544				1,467				1,651			3,662			93,780		97,442
	Residential mortgages	7,463				1,565				5,165			14,193			36,485		50,678
	Total	$	13,922			$	9,881			$	143,238		$	167,041		$	363,102	$	530,143
	(a) Installment loans 90 days or more past due and accruing include $2.1 million of loans guaranteed by the U.S. government as of December 31, 2013.
	(b) Excludes loss share receivable of $61.8 million as of December 31, 2013.
	(c) Acquired impaired loans were not classified as nonperforming assets at December 31, 2013 as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cash flows, is being recognized on all acquired impaired loans. These asset quality disclosures are, therefore, not applicable to acquired impaired loans.
	As of December 31, 2012
	Originated Loans																			≥ 90 Days
		Days Past Due											Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (a)		Loans
	Commercial
	C&I	$	3,814			$	1,986			$	3,571		$	9,371		$	3,297,155	$	3,306,526	$	104	$	5,255
	CRE	4,181				4,530				11,535			20,246			2,204,170		2,224,416		382		15,780
	Construction	981				—				597			1,578			333,969		335,547		—		731
	Leases	6				—				—			6			139,230		139,236		—		—
	Consumer
	Installment	11,722				3,193				5,639			20,554			1,307,704		1,328,258		4,942		2,914
	Home Equity Lines	1,584				880				1,227			3,691			802,387		806,078		475		1,557
	Credit Cards	969				558				954			2,481			143,906		146,387		438		598
	Residential Mortgages	13,291				2,488				5,231			21,010			424,201		445,211		3,076		9,852
	Total	$	36,548			$	13,635			$	28,754		$	78,937		$	8,652,722	$	8,731,659	$	9,417	$	36,687
	Covered Loans (b)																			≥ 90 Days
		Days Past Due											Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90			Past Due			Current		Loans		Accruing (c)		Loans (c)
	Commercial
	C&I	$	931			$	981			$	24,111		$	26,023		$	102,486	$	128,509	n/a		n/a
CRE	4,130				15,019				172,444			191,593			348,002		539,595		n/a		n/a
Construction	589				7,925				34,314			42,828			7,505		50,333		n/a		n/a
Consumer
Installment	1				65				21			87			8,102		8,189		n/a		n/a
Home equity lines	1,528				654				2,211			4,393			112,832		117,225		n/a		n/a
Residential mortgages	10,005				442				7,763			18,210			43,330		61,540		n/a		n/a
Total	$	17,184			$	25,086			$	240,864		$	283,134		$	622,257	$	905,391	n/a		n/a
(a) Installment loans 90 days or more past due and accruing include $3.4 million of loans guaranteed by the U.S. government as of December 31, 2012.
(b) Excludes loss share receivable of $113.7 million as of December 31, 2012.
(c) Acquired impaired loans were not classified as nonperforming assets at December 31, 2012 as the loans are considered to be performing under ASC 310-30. As a result interest income, through the accretion of the difference between the carrying amount of the loans and the expected cash flows, is being recognized on all acquired impaired loans. These asset quality disclosures are, therefore, not applicable to acquired impaired loans
Financing Receivable Credit Quality Indicators	'
	The following tables provide a summary of commercial loans by portfolio type and the Corporation's internal credit quality rating:
	As of December 31, 2013
	Originated Loans
		Commercial
		C&I				CRE				Construction			Leases
	Grade 1	$	34,909			$	241			$	—		$	9,271
	Grade 2	108,709				3,730				—			2,900
	Grade 3	802,624				315,150				25,632			54,446
	Grade 4	3,133,177				1,759,201				306,795			167,022
	Grade 5	30,116				46,483				267			5,750
	Grade 6	30,032				44,982				6,231			162
	Grade 7	—				—				—			—
	Total	$	4,139,567			$	2,169,787			$	338,925		$	239,551
	Acquired Loans
		Commercial
		C&I				CRE				Construction			Leases
	Grade 1	$	—			$	—			$	—		$	—
	Grade 2	1,741				703				—			—
	Grade 3	79,634				29,224				—			—
	Grade 4	643,495				722,307				13,246			—
	Grade 5	46,807				93,499				—			—
	Grade 6	22,402				72,912				—			—
	Grade 7	—				—				—			—
	Total	$	794,079			$	918,645			$	13,246		$	—
	Covered Loans
		Commercial
		C&I				CRE				Construction			Leases
	Grade 1	$	—			$	—			$	—		$	—
	Grade 2	968				—				—			—
	Grade 3	—				—				—			—
	Grade 4	41,115				113,863				601			—
	Grade 5	427				6,219				—			—
	Grade 6	31,621				153,318				23,208			—
	Grade 7	2,106				194				2,220			—
	Total	$	76,237			$	273,594			$	26,029		$	—
	As of December 31, 2012
	Originated Loans
		Commercial
		C&I				CRE				Construction			Leases
	Grade 1	$	42,211			$	—			$	—		$	13,119
	Grade 2	114,480				3,138				—			179
	Grade 3	661,692				254,749				17,652			20,042
	Grade 4	2,408,669				1,845,686				311,271			104,037
	Grade 5	44,969				53,675				3,057			1,561
	Grade 6	34,505				67,168				3,567			298
	Grade 7	—				—				—			—
	Total	$	3,306,526			$	2,224,416			$	335,547		$	139,236
	Covered Loans
		Commercial
		C&I				CRE				Construction			Leases
	Grade 1	$	—			$	—			$	—		$	—
	Grade 2	1,526				—				—			—
	Grade 3	—				—				—			—
	Grade 4	73,480				214,987				476			—
	Grade 5	3,215				30,708				1,331			—
	Grade 6	47,468				292,158				45,838			—
	Grade 7	2,820				1,742				2,688			—
	Total	$	128,509			$	539,595			$	50,333		$	—

Allowance_for_Loan_and_Lease_L1

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2013
Allowance for loan losses [Abstract]	'
Schedule of Credit Losses Related to Financing Receivables, Current and Non-Current	'
	The following tables show activity in the originated ALLL, by portfolio segment for the years ended December 31, 2013 and 2012, as well as the corresponding recorded investment in originated loans at the end of the period:
	As of December 31, 2013
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Year ended
	Allowance for originated loan losses, beginning balance		$	36,209			$	20,126			$	3,821			$	639			$	11,154			$	13,724			$	7,384			$	5,885		$	98,942
	Charge-offs		(5,840		)		(1,281		)		(516		)		(1,237		)		(16,683		)		(7,172		)		(5,541		)		(1,903		)	(40,173		)
	Recoveries		7,981				524				507				100				10,519				2,979				1,841				230			24,681
	Provision for loan losses		4,631				(7,104		)		(1,002		)		1,579				6,945				3,369				4,056				560			13,034
	Allowance for originated loan losses, ending balance		$	42,981			$	12,265			$	2,810			$	1,081			$	11,935			$	12,900			$	7,740			$	4,772		$	96,484
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	3,235			$	229			$	—			$	—			$	1,014			$	223			$	312			$	1,133		$	6,146
		Collectively evaluated for impairment	39,746				12,036				2,810				1,081				10,921				12,677				7,428				3,639			90,338
	Total ending allowance for originated loan losses balance		$	42,981			$	12,265			$	2,810			$	1,081			$	11,935			$	12,900			$	7,740			$	4,772		$	96,484
	Originated loans:
		Originated loans individually evaluated for impairment	$	8,053			$	20,616			$	906			$	—			$	27,285			$	6,726			$	1,112			$	23,066		$	87,764
		Originated loans collectively evaluated for impairment	4,131,514				2,149,171				338,019				239,551				1,700,640				913,340				147,201				506,187			10,125,623
	Total ending originated loan balance		$	4,139,567			$	2,169,787			$	338,925			$	239,551			$	1,727,925			$	920,066			$	148,313			$	529,253		$	10,213,387
	As of December 31, 2012
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Year ended
	Allowance for originated loan losses, beginning balance		$	32,363			$	31,857			$	5,173			$	341			$	17,981			$	6,766			$	7,369			$	5,849		$	107,699
	Charge-offs		(22,639		)		(5,312		)		(697		)		(144		)		(18,029		)		(8,949		)		(6,171		)		(3,964		)	(65,905		)
	Recoveries		4,266				911				449				38				11,694				3,441				2,138				235			23,172
	Provision for loan losses		22,219				(7,330		)		(1,104		)		404				(492		)		12,466				4,048				3,765			33,976
	Allowance for originated loan losses, ending balance		$	36,209			$	20,126			$	3,821			$	639			$	11,154			$	13,724			$	7,384			$	5,885		$	98,942
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	577			$	913			$	105			$	—			$	1,526			$	34			$	127			$	1,722		$	5,004
		Collectively evaluated for impairment	35,632				19,213				3,716				639				9,628				13,690				7,257				4,163			93,938
	Total ending allowance for originated loan losses balance		$	36,209			$	20,126			$	3,821			$	639			$	11,154			$	13,724			$	7,384			$	5,885		$	98,942
	Originated loans:
		Originated loans individually evaluated for impairment	$	6,187			$	24,007			$	3,405			$	—			$	30,870			$	6,281			$	1,612			$	24,009		$	96,371
		Originated loans collectively evaluated for impairment	3,300,339				2,200,409				332,142				139,236				1,297,388				799,797				144,775				421,202			8,635,288
	Total ending originated loan balance		$	3,306,526			$	2,224,416			$	335,547			$	139,236			$	1,328,258			$	806,078			$	146,387			$	445,211		$	8,731,659
Schedule of Credit Losses Financing Receivables Acquired Loans [Table Text Block]	'
	The following table presents activity in the allowance for acquired impaired loan losses for the year ended December 31, 2013:
			Year Ended December 31,
	Allowance for Acquired Impaired Loan Losses		2013
	Balance at beginning of the period		$	—
	Charge-offs		—
	Recoveries		—
	Provision for loan losses		741
	Balance at end of the period		$	741
Schedule of Credit Losses Related to Covered FInancing Receivables, Current	'
	The following table presents activity in the allowance for covered impaired loan losses for the years ended December 31, 2013 and 2012:
			Year Ended December 31,
	Allowance for Covered Impaired Loan Losses		2013				2012
	Balance at beginning of the period		$	43,255			$	36,417
		Provision for loan losses before benefit attributable to FDIC loss share agreements	23,892				35,450
		Benefit attributable to FDIC loss share agreements	(10,790		)		(14,728		)
	Net provision for loan losses		13,102				20,722
	Increase in loss share receivable		10,790				14,728
	Loans charged-off		(23,120		)		(28,612		)
	Balance at end of the period		$	44,027			$	43,255
Impaired Financing Receivables	'
	The following tables provide further detail on impaired loans individually evaluated for impairment and the associated ALLL. Certain impaired loans do not have a related ALLL as the valuation of these impaired loans exceeded the recorded investment.
	As of December 31, 2013
							Unpaid								Average
			Recorded				Principal				Related				Recorded
			Investment				Balance				Allowance				Investment
	Impaired loans with no related allowance
	Commercial
		C&I	$	2,503			$	6,679			$	—			$	7,256
		CRE	17,871				23,709				—				18,639
		Construction	906				1,179				—				1,035
	Consumer
		Installment	2,813				3,978				—				3,338
		Home equity line	1,018				1,347				—				1,079
		Credit card	49				49				—				91
		Residential mortgages	10,250				12,778				—				10,258
	Subtotal		35,410				49,719				—				41,696
	Impaired loans with a related allowance
	Commercial
		C&I	5,551				7,428				3,235				5,009
		CRE	2,744				2,870				229				2,836
		Construction	—				—				—				—
	Consumer
		Installment	24,472				24,558				1,014				24,985
		Home equity line	5,707				5,707				223				5,874
		Credit card	1,064				1,064				312				1,238
		Residential mortgages	12,816				12,898				1,133				12,064
	Subtotal		52,354				54,525				6,146				52,006
		Total impaired loans	$	87,764			$	104,244			$	6,146			$	93,702
	Note 1: These tables exclude loans fully charged off.
	Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
	As of December 31, 2012
							Unpaid								Average
			Recorded				Principal				Related				Recorded
			Investment				Balance				Allowance				Investment
	Impaired loans with no related allowance
	Commercial
		C&I	$	3,098			$	14,473			$	—			$	12,533
		CRE	19,664				26,402				—				23,911
		Construction	2,684				3,306				—				3,861
	Consumer
		Installment	2,527				3,947				—				4,251
		Home equity line	642				849				—				860
		Credit card	467				467				—				568
		Residential mortgages	9,578				12,142				—				10,645
	Subtotal		38,660				61,586				—				56,629
	Impaired loans with a related allowance
	Commercial
		C&I	3,089				4,943				577				4,231
		CRE	4,343				4,927				913				3,834
		Construction	721				721				105				730
	Consumer
		Installment	28,343				28,706				1,526				29,583
		Home equity line	5,639				5,639				34				5,924
		Credit card	1,145				1,145				127				1,311
		Residential mortgages	14,431				14,520				1,722				14,537
	Subtotal		57,711				60,601				5,004				60,150
		Total impaired loans	$	96,371			$	122,187			$	5,004			$	116,779
	Note 1: These tables exclude loans fully charged off.
	Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
Troubled Debt Restructurings on Financing Receivables	'
	The following tables provide the number of loans modified in a TDR and the recorded investment and unpaid principal balance by loan portfolio as of December 31, 2013 and 2012.
				As of December 31, 2013
				Number of Loans			Recorded Investment				Unpaid Principal Balance
	Originated loans
		Commercial
			C&I	35			$	4,449			$	7,660
			CRE	52			15,932				20,569
			Construction	30			905				1,179
			Total originated commercial	117			21,286				29,408
		Consumer
			Installment	1,553			27,285				28,536
			Home equity lines	231			6,725				7,054
			Credit card	307			1,113				1,113
			Residential mortgages	301			23,067				25,676
			Total originated consumer	2,392			58,190				62,379
	Total originated loans			2,509			$	79,476			$	91,787
	Acquired Loans
		Commercial
			C&I	1			6				5
			CRE	1			1,730				1,730
			Total acquired commercial	2			1,736				1,735
		Consumer
			Installment	12			505				542
			Home equity lines	8			245				270
			Residential mortgages	7			431				502
			Total acquired consumer	27			1,181				1,314
	Total acquired loans			29			2,917				3,049
	Covered loans
		Commercial
			C&I	4			$	1,104			$	2,331
			CRE	24			39,995				57,008
			Construction	10			4,144				24,547
			Total covered commercial	38			45,243				83,886
		Consumer
			Home equity lines	47			5,401				5,421
			Residential mortgages	1			$	150			$	150
			Total covered consumer	48			5,551				5,571
	Total covered loans			86			$	50,794			$	89,457
	Total loans
		Commercial
			C&I	40			$	5,559			$	9,996
			CRE	77			57,657				79,307
			Construction	40			5,049				25,726
			Total commercial	157			68,265				115,029
		Consumer
			Installment	1,565			27,790				29,078
			Home equity lines	286			12,371				12,745
			Credit card	307			1,113				1,113
			Residential mortgages	309			23,648				26,328
			Total consumer	2,467			64,922				69,264
	Total loans			2,624			$	133,187			$	184,293
	Note 1: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
					As of December 31, 2012
					Number of Loans			Recorded Investment				Unpaid Principal Balance
	Originated loans
		Commercial
			C&I		24			$	2,617			$	8,044
			CRE		40			16,305				20,701
			Construction		28			2,955				3,419
			Total originated commercial		92			21,877				32,164
		Consumer
			Installment		1,769			30,870				32,653
			Home equity lines		226			6,281				6,488
		Credit card		389			1,612				1,612
		Residential mortgages		298			24,009				26,662
		Total originated consumer		2,682			62,772				67,415
Total originated loans				2,774			$	84,649			$	99,579
Covered loans
	Commercial
		C&I		3			$	1,763			$	1,998
		CRE		20			50,272				57,483
		Construction		10			8,171				37,547
		Total covered commercial		33			60,206				97,028
	Consumer
		Home equity lines		35			5,632				5,666
Total covered loans				68			$	65,838			$	102,694
Total loans
	Commercial
		C&I		27			$	4,380			$	10,042
		CRE		60			66,577				78,184
		Construction		38			11,126				40,966
		Total commercial		125			82,083				129,192
	Consumer
		Installment		1,769			30,870				32,653
		Home equity lines		261			11,913				12,154
		Credit card		389			1,612				1,612
		Residential mortgages		298			24,009				26,662
		Total consumer		2,717			68,404				73,081
Total loans				2,842			$	150,487			$	202,273
Note 1: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
Accruing and Nonaccruing Troubled Debt Restructurings	'
	The following tables provide a summary of the delinquency status of TDRs along with the specific allowance for loan loss, by loan type, as of December 31, 2013 and 2012, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
	As of December 31, 2013
		Accruing TDRs												Nonaccruing TDRs												Total				Total
		Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
	Originated loans
	Commercial
	C&I	$	1,438			$	879			$	2,317			$	177			$	1,955			$	2,132			$	4,449			$	665
	CRE	10,442				382				10,824				1,208				3,900				5,108				15,932				32
	Construction	848				—				848				—				57				57				905				—
	Total originated commercial	12,728				1,261				13,989				1,385				5,912				7,297				21,286				697
	Consumer
	Installment	23,342				1,238				24,580				2,483				222				2,705				27,285				540
	Home equity lines	5,313				194				5,507				1,206				12				1,218				6,725				197
	Credit card	1,046				66				1,112				—				1				1				1,113				254
	Residential mortgages	12,276				3,327				15,603				4,360				3,104				7,464				23,067				1,308
	Total originated consumer	41,977				4,825				46,802				8,049				3,339				11,388				58,190				2,299
	Total originated TDRs	$	54,705			$	6,086			$	60,791			$	9,434			$	9,251			$	18,685			$	79,476			$	2,996
	Acquired loans
	Commercial
	C&I	—				—				—				6				—				6				6				—
	CRE	1,730				—				1,730				—				—				—				1,730				—
	Total acquired commercial	1,730				—				1,730				6				—				6				1,736				—
	Consumer
	Installment	369				136				505				—				—				—				505				50
	Home equity lines	182				—				182				63				—				63				245				384
	Residential mortgages	245				—				245				32				154				186				431				307
	Total acquired consumer	796				136				932				95				154				249				1,181				741
	Total acquired TDRs	$	2,526			$	136			$	2,662			$	101			$	154			$	255			$	2,917			$	741
	Covered loans
	Commercial
	C&I	$	362			$	742			$	1,104			$	—			$	—			$	—			$	1,104			$	—
	CRE	5,259				34,736				39,995				—				—				—				39,995				3,022
	Construction	698				3,446				4,144				—				—				—				4,144				800
	Total covered commercial	6,319				38,924				45,243				—				—				—				45,243				3,822
	Consumer
	Home equity lines	5,377				24				5,401				—				—				—				5,401				—
	Residential mortgages	150				—				150				—				—				—				150				—
	Total covered consumer	5,527				24				5,551				—				—				—				5,551				—
	Total covered TDRs	$	11,846			$	38,948			$	50,794			$	—			$	—			$	—			$	50,794			$	3,822
	Total loans
	Commercial
	C&I	$	1,800			$	1,621			$	3,421			$	183			$	1,955			$	2,138			$	5,559			$	665
	CRE	17,431				35,118				52,549				1,208				3,900				5,108				57,657				3,054
	Construction	1,546				3,446				4,992				—				57				57				5,049				800
	Total commercial	20,777				40,185				60,962				1,391				5,912				7,303				68,265				4,519
	Consumer
	Installment	23,711				1,374				25,085				2,483				222				2,705				27,790				590
	Home equity lines	10,872				218				11,090				1,269				12				1,281				12,371				581
	Credit card	1,046				66				1,112				—				1				1				1,113				254
	Residential mortgages	12,671				3,327				15,998				4,392				3,258				7,650				23,648				1,615
	Total consumer	48,300				4,985				53,285				8,144				3,493				11,637				64,922				3,040
	Total TDRs	$	69,077			$	45,170			$	114,247			$	9,535			$	9,405			$	18,940			$	133,187			$	7,559
	As of December 31, 2012
		Accruing TDRs												Nonaccruing TDRs												Total				Total
		Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
	Originated loans
	Commercial
	C&I	$	704			$	1,004			$	1,708			$	844			$	65			$	909			$	2,617			$	217
	CRE	12,719				793				13,512				461				2,332				2,793				16,305				869
	Construction	1,860				960				2,820				135				—				135				2,955				105
	Total originated commercial	15,283				2,757				18,040				1,440				2,397				3,837				21,877				1,191
	Consumer
	Installment	27,085				1,547				28,632				2,064				174				2,238				30,870				1,526
Home equity lines	5,183				236				5,419				636				226				862				6,281				34
Credit card	1,483				118				1,601				—				11				11				1,612				127
Residential mortgages	12,510				3,413				15,923				5,196				2,890				8,086				24,009				1,722
Total originated consumer	46,261				5,314				51,575				7,896				3,301				11,197				62,772				3,409
Total originated TDRs	$	61,544			$	8,071			$	69,615			$	9,336			$	5,698			$	15,034			$	84,649			$	4,600
Covered loans
Commercial
C&I	$	435			$	1,328			$	1,763			$	—			$	—			$	—			$	1,763			$	518
CRE	7,658				42,614				50,272				—				—				—				50,272				4,959
Construction	2,361				5,810				8,171				—				—				—				8,171				1,220
Total covered commercial	10,454				49,752				60,206				—				—				—				60,206				6,697
Consumer
Home equity lines	5,632				—				5,632				—				—				—				5,632				—
Total covered consumer	5,632				—				5,632				—				—				—				5,632				—
Total covered TDRs	$	16,086			$	49,752			$	65,838			$	—			$	—			$	—			$	65,838			$	6,697
Total loans
Commercial
C&I	$	1,139			$	2,332			$	3,471			$	844			$	65			$	909			$	4,380			$	735
CRE	20,377				43,407				63,784				461				2,332				2,793				66,577				5,828
Construction	4,221				6,770				10,991				135				—				135				11,126				1,325
Total commercial	25,737				52,509				78,246				1,440				2,397				3,837				82,083				7,888
Consumer
Installment	27,085				1,547				28,632				2,064				174				2,238				30,870				1,526
Home equity lines	10,815				236				11,051				636				226				862				11,913				34
Credit card	1,483				118				1,601				—				11				11				1,612				127
Residential mortgages	12,510				3,413				15,923				5,196				2,890				8,086				24,009				1,722
Total consumer	51,893				5,314				57,207				7,896				3,301				11,197				68,404				3,409
Total TDRs	$	77,630			$	57,823			$	135,453			$	9,336			$	5,698			$	15,034			$	150,487			$	11,297
Schedule of Debtor Troubled Debt Restructuring, Current Period	'
	The following table provides the number of loans modified in a TDR during the previous 12 months that subsequently defaulted during the year ended December 31, 2013, as well as the recorded investment in these restructured loans as of December 31, 2013.
		As of December 31, 2013
		Number of Loans			Recorded Investment
	Originated loans
	Commercial
	C&I	4			$	1,773
	CRE	6			3,101
	Construction	1			231
	Total originated commercial	11			5,105
	Consumer
	Installment	17			170
	Home equity lines	—			—
	Credit card	33			245
	Residential mortgages	1			75
	Total originated consumer	51			$	490
	Covered loans
	Commercial
	C&I	—			$	—
	CRE	1			—
	Construction	1			45
	Total covered commercial	2			$	45
	Total loans	64			5,640
	Commercial
	C&I	4			$	1,773
	CRE	7			3,101
	Construction	2			276
	Total commercial	13			5,150
	Consumer
	Installment	17			170
	Home equity lines	—			—
	Credit card	33			245
	Residential mortgages	1			75
	Total consumer	51			490
	Total	64			$	5,640
		As of December 31, 2012
		Number of Loans			Recorded Investment
	Originated loans
	Commercial
	C&I	3			$	1,603
	CRE	1			500
	Construction	—			—
	Total originated commercial	4			2,103
	Consumer
	Installment	11			280
	Home equity lines	—			—
	Credit card	37			273
	Residential mortgages	1			21
	Total originated consumer	49			$	574
	Covered loans
	Commercial
	C&I	—			$	—
	CRE	—			—
	Construction	1			716
	Total covered commercial	1			$	716
	Total loans	54			3,393
	Commercial
	C&I	3			$	1,603
	CRE	1			500
	Construction	1			716
	Total commercial	5			2,819
	Consumer
	Installment	11			280
	Home equity lines	—			—
Credit card	37			273
Residential mortgages	1			21
Total consumer	49			574
Total	54			$	3,393

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	Goodwill totaled $739.8 million as of December 31, 2013 and $460.0 million as of December 31, 2012 and is allocated among the business segments. Changes to the carrying amount of goodwill not subject to amortization for the years ended December 31, 2011, 2012 and 2013 are provided in the following table:
		Commercial		Retail			Wealth		Total
	Balance at December 31, 2011	$	384,721	$	66,141		$	9,182	$	460,044
	Balance at December 31, 2012	384,721		66,141			9,182		460,044
	Goodwill Acquired	$	142,685	$	125,899		$	11,191	$	279,775
	Balance at December 31, 2013	$	527,406	$	192,040		$	20,373	$	739,819
Accumulated amortization of intangible assets	'
	The following tables show the gross carrying amount and the amount of accumulated amortization of intangible assets subject to amortization.
		December 31, 2013
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	87,533	$	(16,065	)	$	71,468
	Noncompete covenant	102		(102		)	—
	Lease intangible	618		(520		)	98
	Trust intangibles	14,000		(2,811		)	11,189
		$	102,253	$	(19,498	)	$	82,755
		December 31, 2012
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	16,759	$	(10,546	)	$	6,213
	Noncompete covenant	102		(76		)	26
	Lease intangible	618		(484		)	134
		$	17,479	$	(11,106	)	$	6,373
Schedule of Expected Amortization Expense	'
	The following table shows the estimated future amortization expense for intangible assets subject to amortization as of December 31, 2013.
	For the years ended:
	December 31, 2014	$	11,732
	December 31, 2015	10,391
	December 31, 2016	9,209
	December 31, 2017	8,161
	December 31, 2018	7,273
		$	46,766

Mortgage_Servicing_Rights_and_1

Mortgage Servicing Rights and Mortgage Servicing Activity (Tables)	12 Months Ended
	Dec. 31, 2013
Transfers and Servicing [Abstract]	'
Changes in the carrying amount of mortgage servicing rights	'
	Changes in the carrying amount of mortgage servicing rights and mortgage servicing rights valuation allowance are as follows:
		Year Ended December 31,
		2013			2012			2011
	Balance at beginning of period	$	21,316		$	21,179		$	21,317
	Addition of Citizens' MSR's on Acquisition Date	994			—			—
	Additions	4,952			5,876			4,442
	Amortization	(4,502		)	(5,739		)	(4,580		)
	Balance at end of period	22,760			21,316			21,179
	Valuation allowance at beginning of period	(2,564		)	(3,539		)	—
	Recoveries (Additions)	2,282			975			(3,539		)
	Valuation Allowance at end of period	(282		)	(2,564		)	(3,539		)
	Mortgage servicing rights, net carrying balance	$	22,478		$	18,752		$	17,640
	Fair value at end of period	$	23,041		$	18,833		$	17,749
Changes in Key economics assumptions	'
	Key economic assumptions and the sensitivity of the current fair value of the mortgage servicing rights related to immediate 10% and 25% adverse changes in those assumptions at December 31, 2013 are presented in the following table below. These sensitivities are hypothetical and should be used with caution. As the figures indicate, changes in the fair value based on 10% variation in the prepayment speed assumption generally cannot be extrapolated because the relationship of the change in the prepayment speed assumption to the change in fair value may not be linear. Also, in the below table, the effect of a variation in the discount rate assumption on the fair value of the mortgage servicing rights is calculated independently without changing any other assumption. In reality, changes in one factor may result in changes in another (for example, changes in prepayment speed estimates could result in changes in the discount rates), which might magnify or counteract the sensitivities.
	Prepayment speed assumption (annual CPR)	9.67		%
	Decrease in fair value from 10% adverse change	$	745
	Decrease in fair value from 25% adverse change	$	1,789
	Discount rate assumption	9.85		%
	Decrease in fair value from 100 basis point adverse change	$	719
	Decrease in fair value from 200 basis point adverse change	$	1,391
	Expected weighted-average life (in months)	100.5
Estimated amortization expense for mortgage servicing rights	'
	The following table shows the estimated future amortization for mortgage servicing rights as of December 31, 2013:
	Year Ended December 31,
	2014	$	3,588
	2015	3,241
	2016	2,759
	2017	2,339
	2018	1,971
	more than 5 years	8,580
		$	22,478

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Schedule of Premises and Equipment	'
	The components of premises and equipment are as follows:
		As of December 31,				Estimated
		2013		2012		useful lives
	Land	$	64,810	$	46,118	-
	Buildings	310,345		200,578		10-35 yrs
	Equipment	156,521		125,342		3-15 yrs
	Leasehold improvements	23,872		20,228		1-20 yrs
	Software	83,989		72,218		3-7 yrs
		639,537		464,484
	Less accumulated depreciation and amortization	312,483		283,335
		$	327,054	$	181,149

Certificates_and_Other_Time_De1

Certificates and Other Time Deposits Certificates and Other Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2013
Time Deposits [Abstract]	'
Maturities of Certificates and Other Time Deposits	'
	Maturities of certificates and other time deposits as of December 31, 2013 are as follows:
	For the year ended December 31,
	2014	$	1,708,678
	2015	483,667
	2016	129,216
	2017	56,762
	2018	73,018
	2019 and after	9,329
		$	2,460,670

Federal_Funds_Purchased_and_Se1

Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Abstract]	'
Schedule of Federal Funds Purchased and Securities Sold Under Agreements to Repurchase and Wholesale Borrowings	'
	The following table presents federal funds purchased, securities sold under agreements to repurchase and the components of our borrowed funds which consist of FHLB advances, long-term subordinated debt, and fixed and variable junior subordinated debentures:
			As of December 31,
			2013			2012
	Federal funds purchased and securities sold under agreements to repurchase		$	851,535		$	1,104,525
	Borrowed Funds
	FHLB advances		$	200,323		$	136,546
	Subordinate debentures		249,928			—
	Fixed and variable junior subordinate deferral debentures		74,500			—
	Other		277			337
	Total borrowed funds		$	525,028		$	136,883
Schedule of Select Financial Data Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	'
	Securities sold under agreements to repurchase are secured by securities with a carrying value of $1.0 billion and $723.0 million at December 31, 2013 and 2012, respectively. Securities sold under agreements to repurchase have an overnight maturity at December 31, 2013. Selected financial statement information pertaining to the securities sold under agreements to repurchase is as follows:
		As of December 31,
		2013			2012			2011
	Federal funds purchased and securities sold under agreements to repurchase
	Average balance during the year	$	949,068		$	949,756		$	925,803
	Weighted-average annual interest rate during the year	0.13		%	0.12		%	0.36		%
	Maximum month-end balance	$	1,123,795		$	1,104,525		$	1,014,720
Schedule of Select Financial Data Wholesale Borrowings [Table Text Block]	'
	FHLB advances were secured by a lien on residential and other real estate-related loans totaling $2.4 billion at December 31, 2013 and $1.2 billion at December 31, 2012. The FHLB advances have interest rates that range from 1.54% to 4.12% as of December 31, 2013.
	The Corporation issued subordinated notes as part of a public offering on February 4, 2013 in conjunction with the Citizens merger. The offering consisted of $250 million aggregate principal amount of subordinated notes due February 4, 2023 bearing interest at an annual rate of 4.35% payable semi-annually in arrears on February 4 and August 4 of each year.
	Selected financial statement information pertaining to the Corporation's borrowed funds is as follows:
		As of December 31,
		2013			2012			2011
	Borrowed funds
	Average balance during the year	$	474,473		$	175,989		$	298,835
	Weighted-average annual interest rate during the year	3.62		%	2.51		%	2.11		%
	Maximum month-end balance	$	527,155		$	178,489		$	327,997
Schedule of Maturities of Federal Funds Purchasedand Securities Sold Under Agreements to Repurchase and Wholesale Borrowings	'
	The following table illustrates the contractual maturities of the Corporation's borrowed funds at December 31, 2013:
			One Year			One to			Three to		Over Five
			or Less			Three Years			Five Years		Years		Total
	Borrowed funds
	FHLB advances		$	39,883		$	143,470		$	211	$	16,759	$	200,323
	Subordinate debentures		—			—			—		249,928		249,928
	Fixed and variable junior subordinate deferral debentures		—			—			—		74,500		74,500
	Other		63			138			76		—		277
	Total borrowed funds		$	39,946		$	143,608		$	287	$	341,187	$	525,028

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit)	'
	Income tax expense is comprised of the following:
		Year Ended December 31,
		2013				2012				2011
	Taxes currently payable
	Federal	$	20,266			$	45,683			$	45,026
	State	3,496				2,655				1,823
	Deferred expense (benefit)	52,664				4,679				(756		)
		$	76,426			$	53,017			$	46,093
Schedule of Effective Income Tax Rate Reconciliation	'
	The actual income tax rate differs from the statutory tax rate as shown in the following table:
			Year Ended December 31,
			2013			2012			2011
	Statutory rate		35	%		35	%		35	%
	Increase (decrease) in rate due to:
		Interest on tax-exempt securities and tax-free loans, net	(3.16	)		(3.23	)		(3.04	)
		Merger expenses at acquisition	0.54			—			—
		Reduction in excess tax reserves	0.11			—			—
		Bank owned life insurance	(2.53	)		(3.10	)		(3.26	)
		State income tax (net)	0.87			0.94			0.72
		Tax credits	(1.89	)		(2.15	)		(2.12	)
		ESOP Dividends	(0.14	)		(0.21	)		(0.24	)
		Nondeductible meals and entertainment	0.27			0.25			0.29
		Other	0.31			0.83			0.48
	Effective tax rates		29.38	%		28.33	%		27.83	%
Schedule of Deferred Tax Assets and Liabilities	'
	Principal components of the Corporation's net deferred tax asset are summarized as follows:
			Year Ended
			December 31,
			2013				2012
	Deferred tax assets:
		Allowance for credit losses	$	37,857			$	37,341
		Employee benefits	33,615				42,934
		Real Estate Mortgage Investment Credit	5,645				6,201
		Acquired liabilities	13,734				5,041
		Acquired loans	62,993				—
		Available for sale securities	16,819				—
		Loan fees and expenses	2,777				—
		Goodwill	—				2,838
		Core deposit intangible	—				1,275
		Federal NOL carryforwards	190,350				—
		Tax credit carryforwards	47,597				—
		State income tax (net of federal benefit)	4,682				—
			416,069				95,630
	Deferred tax liabilities:
		Leased assets and depreciation	(25,818		)		(6,962		)
		Acquired loans	—				(18,765		)
		Available for sale securities	—				(29,841		)
		FHLB stock	(24,401		)		(25,577		)
		Loan fees and expenses	—				(5,709		)
		Goodwill	(7,129		)		—
		Core deposit intangibles	(25,302		)		—
		Other	(3,510		)		(1,665		)
			(86,160		)		(88,519		)
	Total net deferred tax asset		$	329,909			$	7,111
Change in Deferred Taxes	'
	At December 31, 2013, the Corporation had gross federal loss carryforwards of $543.9 million that expire in 2028 through 2032, general business credits of $5.7 million that expire in 2028 and $41.9 million of federal alternative minimum tax credits with an indefinite life. In addition, future state income taxes are expected to be reduced by $1.5 million resulting from state NOLs at various levels in various states. This benefit is expected to be fully used during the expiration period of 2014 through 2027.
	The period change in deferred taxes recorded both directly to shareholders' equity and as a part of the income tax expense can be summarized as follows:
			Year Ended December 31,
			2013				2012
	Deferred tax changes reflected in other comprehensive income		$	(27,224	)		$	4,137
	Deferred tax changes reflected in Federal income tax expense		52,665				4,679
	Deferred tax changes reflected in acquired net assets		(348,239		)		—
		Net change in deferred taxes	$	(322,798	)		$	8,816
Summary of Income Tax Contingencies	'
	A reconciliation of the change in the reserve for uncertain tax positions is as follows:
		Federal and				Accrued				Gross Unrecognized Income Tax Benefits
		State Tax				Interest and
						Penalties
	Balance as of January 1, 2013	$	953			$	854			$	1,807
	Additions for tax provisions related to prior year	77				72				149
	Reduction for tax positions related to prior tax years	(27		)		(664		)		(691		)
	Balance at December 31, 2013	$	1,003			$	262			$	1,265
	Components of Reserve:
	Potential adjustment to nondeductible interest expense	$	30			$	5			$	35
	State income tax exposure	973				257				1,230
	Balance at December 31, 2013	$	1,003			$	262			$	1,265
	Balance as of January 1, 2012	$	946			$	1,491			$	2,437
	Additions for tax provisions related to prior year	74				621				695
	Reduction for tax positions related to prior year due closed tax years	(28		)		(44		)		(72		)
	Reduction for tax positions related to prior tax years	(39		)		(1,214		)		(1,253		)
	Balance at December 31, 2012	$	953			$	854			$	1,807
	Components of Reserve:
	Potential adjustment to nondeductible interest expense	$	30			$	4			$	34
	Timing of the accrual for interest on nonperforming assets	—				631				631
	State income tax exposure	923				219				1,142
	Balance at December 31, 2012	$	953			$	854			$	1,807

Benefit_Plans_Tables

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Schedule of Net Benefit Costs	'
	The combined components of net periodic pension and postretirement benefits and other amounts recognized in AOCI for the Corporation's pension and postretirement benefit plans as of December 31, 2013, 2012 and 2011 are as follows:
		Pension Benefits											Postretirement Benefits
		2013				2012				2011			2013			2012			2011
	Net periodic cost consists of:
	Service cost	$	2,339			$	7,194			$	6,123		$	99		$	77		$	54
	Interest cost	12,814				11,862				11,439			563			697			886
	Expected return on plan assets	(14,938		)		(12,136		)		(13,313		)	—			—			—
	Amortization of prior service cost/(credit)	469				388				394			(468		)	(468		)	—
	Amortization of actuarial (gain)/loss	4,693				10,371				7,120			268			288			114
	Settlement / curtailment income	(524		)		(142		)		—			—			—			—
	Net periodic cost (benefit)	4,852				17,537				11,763			462			594			1,054
	Other changes in plan assets and benefit obligations recognized in Other comprehensive income:
	Current year actuarial loss/(gain)	(47,417		)		1,281				38,403			(682		)	(57		)	(3,217		)
	Amortization of actuarial gain/(loss)	(4,169		)		(10,229		)		(7,120		)	(268		)	(288		)	(114		)
	Amortization of prior service (cost)/credit	(469		)		(388		)		(394		)	468			468			—
	Total recognized in AOCI	(52,054		)		(9,337		)		30,889			(482		)	123			(3,330		)
	Total recognized in net periodic cost and AOCI	$	(47,203	)		$	8,200			$	42,652		$	(20	)	$	717		$	(2,276	)
Schedule of Net Funded Status	'
	The following table sets forth a reconciliation of the changes in the projected benefit obligation for the Corporation's pension and postretirement benefit plans as of December 31, 2013 and 2012 as well as the change in plan assets for the Corporation's qualified pension plans:
		Pension Benefits								Postretirement Benefits
		2013				2012				2013			2012
	Accumulated benefit obligation, end of year	307,739				257,206
	Change in projected benefit obligation:
	Projected benefit obligation, beginning of year	$	259,428			$	243,640			$	14,771		$	16,250
	Citizens acquisition	85,483				—				2,062			—
	Service cost	2,339				7,194				99			77
	Interest cost	12,814				11,862				563			697
	Plan amendments	3,927				—				—			—
	Participant contributions	—				—				1,538			1,199
	Actuarial (gains)/losses and change in assumptions	(35,984		)		8,529				(682		)	(58		)
	Benefits paid	(19,172		)		(11,797		)		(2,808		)	(3,394		)
	Projected benefit obligation, end of year	$	308,834			$	259,428			$	15,544		$	14,771
	Change in plan assets, at fair value:
	Fair value of plan assets, beginning of year	$	174,385			$	153,605			$	—		$	—
	Citizens acquisition	68,304				—				—			—
	Actual return on plan assets	30,298				19,372				—			—
	Participant contributions	—				—				1,538			1,199
	Employer contributions	3,695				13,205				1,270			2,195
	Benefits paid	(19,172		)		(11,797		)		(2,808		)	(3,394		)
	Fair value of plan assets, end of year	$	257,510			$	174,385			$	—		$	—
	Funded status (a)	(51,324		)		(85,043		)		(15,544		)	(14,771		)
	Amounts recognized in AOCI before income taxes:
	Prior service cost (credit)	$	5,121			$	1,663			$	(3,858	)	$	(4,326	)
	Net actuarial loss	53,061				108,572				3,329			4,279
	Amount recognized in AOCI	$	58,182			$	110,235			$	(529	)	$	(47	)
	(a) The Corporation recognizes the underfunded status of the plans in accrued taxes, expenses and other liabilities on the Consolidated Balance Sheet.
Schedule of Assumptions Used	'
	Actuarial assumptions. The actuarial assumptions used to determine year end obligations for the Corporation's pension and postretirement plans were as follows:
	Weighted-average assumptions for year end obligations	2013			2012			2011
	Discount rate
	Qualified pensions	4.99	%		4.21	%		5.04	%
	Nonqualified pensions	4.12	%		4.21	%		5.04	%
	Postretirement medical benefits, FirstMerit's plan	4.01	%		3.18	%		4.23	%
	Postretirement medical benefits, Citizens' plan	3.98	%		na			na
	Postretirement life insurance benefits	5.08	%		4.3	%		5.03	%
	Expected long-term rate of return	6.75	%		7	%		7.25	%
	Rate of compensation increase
	Qualified pensions	na			na			5.22	%
	Nonqualified pensions	3.75	%		3.75	%		3.75	%
	Assumed health care cost trend rate, pre-65 (a)
	Initial trend	7.5	%		8	%		8.5	%
	Ultimate trend	5	%		5	%		5	%
	Year ultimate trend reached	2019			2019			2019
	Assumed health care cost trend rate, post-65 (a)
	Initial trend	11.5	%		12	%		12.5	%
	Ultimate trend	5	%		5	%		5	%
	Year ultimate trend reached	2027			2027			2027
	Prescription Drugs
	Initial trend	7.5	%		8	%		8.5	%
	Ultimate trend	5	%		5	%		5	%
	Year ultimate trend reached	2019			2019			2019
	(a) The health care cost trend assumptions relate only to the postretirement benefit plans. Increasing or decreasing the assumed health care cost trend rates by one percentage point each future year would not have a material impact on total service and interest cost or the year end benefit obligation.
	The actuarial assumptions used as of the beginning of the year to determine the net periodic costs for the Corporation's pension and postretirement plans were as follows:
	Weighted-average assumptions for benefit cost at beginning of year	2013			2012			2011
	Discount rate (a)
	Qualified pension	4.21	%		5.04	%		5.6	%
	Nonqualified pensions	4.21	%		5.04	%		5.6	%
	Postretirement medical benefits	3.18	%		4.23	%		4.43	%
	Postretirement life insurance benefits	4.3	%		5.03	%		5.53	%
	Expected long-term rate of return (a)	7	%		7.25	%		8.25	%
	Rate of compensation increase
	Qualified pension	na			5.22	%		5.22	%
	Nonqualified pensions	3.75	%		3.75	%		3.75	%
	Assumed health care cost trend rate, pre-65 (b)
	Initial trend	8	%		8.5	%		9	%
	Ultimate trend	5	%		5	%		5	%
	Year ultimate trend reached	2019			2019			2019
	Assumed health care cost trend rate, post-65 (b)
	Initial trend	12	%		12.5	%		13	%
	Ultimate trend	5	%		5	%		5	%
	Year ultimate trend reached	2027			2027			2027
	Prescription Drugs
	Initial trend	8	%		8.5	%		9	%
	Ultimate trend	5	%		5	%		5	%
	Year ultimate trend reached	2019			2019			2019
	(a) The Citizens Pension and Postretirement Plans were remeasured at the Acquisition Date based on discount rate of 3.83% and an expected long-term rate of return of 6.75%.
	(b) The health care cost trend assumptions relate only to the postretirement benefit plans. Increasing or decreasing the assumed health care cost trend rates by one percentage point each future year would not have a material impact on total service and interest cost or the year end benefit obligation
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]	'
	The amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost (credit) during the next fiscal year are as follows:
		Pension				Postretirement				Total
	Prior service cost	$	2,534			$	(468	)		$	2,066
	Cumulative net loss	1,995				235				2,230
Investment Allocation Strategy	'
	Investment Policy and Strategy. The FirstMerit Pension Plan invests in equities and other return-seeking assets such as real assets, as well as liability-hedging assets, primarily fixed income.  The Investment Policy recognizes that the plan's asset return requirements and risk tolerances will change over time.  The Corporation utilizes a dynamic investment policy, whereby the allocation to return-seeking assets and liability-hedging assets is determined by comparing plan assets to the plan liabilities. As the plan's funded ratio status improves, the allocation to liability-hedging assets will increase.
	Dynamic Investment Policy Schedule
	Return-Seeking (and Diversification) Allocation Strategy
	Funded Ratio	Minimum	Target	Maximum
	≤80%	58%	65%	72%
	81%-83%	55%	62%	69%
	84%-86%	52%	58%	64%
	87%-89%	47%	53%	59%
	90%-92%	43%	49%	55%
	93%-95%	39%	44%	49%
	96%-98%	35%	40%	45%
	99%-101%	31%	35%	39%
	102%-104%	27%	31%	35%
	105%-107%	22%	26%	30%
	107%-110%	18%	22%	26%
	>110%	16%	20%	24%
Schedule of Allocation of Plan Assets	'
	weighted-average allocations for the combined FirstMerit and Citizens Pension Plans as of December 31, 2013 and the FirstMerit Pension Plan for December 31, 2012, by asset category, are as follows:
			Percentage of
			Plan Assets on
			Measurement Date
			December 31,
	Asset Category		2013			2012
	Cash and domestic money market funds		1.92	%		2.97	%
	U.S. Treasury obligations		1.76	%		2.34	%
	U.S. Government agencies		0.96	%		2.03	%
	Corporate bonds		3.12	%		4.55	%
	Common stocks		11.24	%		15.43	%
	Equity mutual funds		27.62	%		31.35	%
	Fixed income mutual funds		36.56	%		24.1	%
	Foreign mutual funds		16.83	%		17.23	%
			100	%		100	%
Schedule of Fair Value of Plan Assets by Measurement	'
	The following table sets forth by level, within the fair value hierarchy, the FirstMerit Pension Plan's assets at fair value as of December 31, 2013:
		Level 1				Level 2				Level 3			Total
	Domestic money market funds	$	4,948			$	—			$	—		$	4,948
	United States government securities	—				4,544				—			4,544
	United States government agency issues	—				2,461				—			2,461
	Corporate bonds	—				8,024				—			8,024
	Common stocks	28,951				—				—			28,951
	Equity mutual funds	71,118				—				—			71,118
	Fixed income mutual funds	94,135				—				—			94,135
	Foreign mutual funds	43,330				—				—			43,330
	Total assets at fair value	$	242,481			$	15,029			$	—		$	257,510

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]	'
Schedule of Share-based Compensation, Stock Options, Activity	'
	A summary of stock option activity under the Plans as of December 31, 2013, 2012 and 2011 and changes during the years then ended is as follows:
	Options	Shares (000's)		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate InstrinsicValue (000's)
	Outstanding at January 1, 2011	4,292		$	25.29	2.01	70
	Exercised	—		—
	Forfeited	—		—
	Expired	(2,215	)	25.55
	Outstanding at December 31, 2011	2,077		$	25.15	1.85	$	—
	Exercised	—		—
	Forfeited	(71	)	25.85
	Expired	(186	)	25.97
	Outstanding at December 31, 2012	1,820		$	24.73	1.82	$	—
	Acquired	63		218.01
	Exercised	—		—
	Forfeited	(8	)	23.93
	Expired	(479	)	36.64
	Outstanding at December 31, 2013	1,396		$	28.84	1.14	$	87
	Exercisable at December 31, 2013	1,396		$	28.84	1.14	$	87
Schedule of Nonvested Share Activity	'
	A summary of the status of the Corporation's nonvested shares as of December 31, 2013, 2012 and 2011 and changes during the years then ended, is as follows:
				Weighted-Average
				Grant Date
	Nonvested (restricted) Shares	Shares (000's)		Fair Value
	Nonvested at January 1, 2011	871		$	20.17
	Granted	585		16.48
	Vested	(407	)	19.75
	Forfeited or expired	(23	)	19.21
	Nonvested at December 31, 2011	1,026		$	18.26
	Granted	596		16.06
	Vested	(493	)	18.29
	Forfeited or expired	(50	)	18.94
	Nonvested at December 31, 2012	1,079		$	17
	Granted	823		16.47
	Vested	(508	)	17.9
	Forfeited or expired	(52	)	16.89
	Nonvested at December 31, 2013	1,342		$	16.34

Parent_Company_Tables

Parent Company (Tables)	12 Months Ended
	Dec. 31, 2013
Parent Company [Abstract]	'
Schedule Of Condensed Financial Statements	'
	Condensed financial information of FirstMerit Corporation (Parent Company only) is as follows:
				As of December 31,
	Condensed Balance Sheet			2013				2012
		Assets:
			Cash and due from banks	$	125,032			$	140,939
			Investment securities	2,253				1,429
			Investment in subsidiaries, at equity in underlying value of their net assets	2,863,473				1,490,718
			Other assets	77,674				13,973
			Total Assets	$	3,068,432			$	1,647,059
		Liabilities and Shareholders' Equity:
			Long-term debt	$	324,428			$	—
			Accrued and other liabilities	41,110				1,857
			Shareholders' equity	2,702,894				1,645,202
			Total Liabilities and Shareholders' Equity	$	3,068,432			$	1,647,059
				Year Ended December 31,
	Condensed Statement of Income			2013				2012				2011
		Income:
			Cash dividends from subsidiaries	$	81,715			$	155,493			$	72,500
			Noninterest income	483				309				287
			Total income	82,198				155,802				72,787
		Interest and other expenses		29,684				10,799				8,005
		Income before income tax benefit and equity in undistributed income of subsidiaries		52,514				145,003				64,782
		Income tax benefit		(9,341		)		(2,004		)		(1,803		)
			Income before equity in undistributed net income of subsidiaries	61,855				147,007				66,585
		Equity in undistributed income of subsidiaries		121,829				(12,901		)		52,973
		Net income		$	183,684			$	134,106			$	119,558
					Year Ended December 31,
	Condensed Statement of Cash Flows				2013				2012				2011
	Operating activities:
			Net income		$	183,684			$	134,106			$	119,558
			Adjustments to reconcile net income to net cash provided by operating activities
			Equity in undistributed income of subsidiaries		(121,829		)		12,901				(52,973		)
			Decrease in Federal income tax receivable		(30,399		)		(4,446		)		(936		)
			Increase in deferred Federal income tax payable		27,032				106				13
			Increase in interest payable		4,618				—				—
			Other		924				738				558
			Net cash provided by operating activities		64,030				143,405				66,220
	Investing activities:
			Loans or advances to subsidiaries		(50		)		—				(18,704		)
			Repayment of loans to subsidiaries		—				—				76,030
			Cash paid for acquisition, net of cash received		(315,069		)		—				—
			Sale of investments in subsidiaries		—				7,827				—
			Purchases of investment securities		(215		)		(44		)		(45		)
			Net cash (used) provided by investing activities		(315,334		)		7,783				57,281
	Financing activities:
			Proceeds from issuance of subordinated debt		249,927				—				—
			Proceeds from issuance of preferred stock		96,550				—				—
			Cash dividends-common stock		(96,222		)		(69,459		)		(69,255		)
			Cash dividends-preferred stock		(5,337		)		—				—
			Purchase of treasury shares		(9,521		)		(2,389		)		(2,295		)
			Net cash provided (used) by financing activities		235,397				(71,848		)		(71,550		)
	(Decrease) increase in cash and cash equivalents				(15,907		)		79,340				51,951
	Cash and cash equivalents at beginning of year				140,939				61,599				9,648
	Cash and cash equivalents at end of year				$	125,032			$	140,939			$	61,599

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Lines of business results and key performance measures	'
	the Corporation’s business is conducted in the United States of America. The following tables present a summary of financial results as of and for the years ended December 31, 2013, 2012 and 2011:
																FirstMerit
	December 31, 2013	Commercial			Retail			Wealth				Other				Consolidated
	OPERATIONS:
	Net interest income	$	386,768		$	322,942		$	14,902			$	(13,827	)		$	710,785
	Provision for loan losses	17,072			16,151			(692		)		1,153				33,684
	Noninterest income	83,933			114,679			48,289				23,442				270,343
	Noninterest expense	209,936			330,875			54,196				92,327				687,334
	Net income	158,400			58,886			6,296				(39,898		)		183,684
	AVERAGES:
	Assets	8,397,357			4,746,277			259,601				8,086,540				21,489,775
	Loans	8,292,805			4,367,701			226,152				62,008				12,948,666
	Earnings assets	8,480,005			4,392,937			226,179				5,393,874				18,492,995
	Deposits	5,572,287			10,749,725			826,794				152,782				17,301,588
	Economic Capital	602,561			256,362			72,244				1,477,698				2,408,865
																	FirstMerit
	December 31, 2012		Commercial			Retail			Wealth				Other				Consolidated
	OPERATIONS:
	Net interest income		$	258,575		$	207,907		$	17,444			$	(12,096	)		$	471,830
	Provision for loan losses		32,319			10,008			(626		)		12,997				54,698
	Noninterest income		67,606			103,279			32,996				19,723				223,604
	Noninterest expense		159,525			221,297			39,296				33,495				453,613
	Net income		87,318			51,922			7,650				(12,784		)		134,106
	AVERAGES:
	Assets		6,424,226			2,952,280			238,805				5,005,316				14,620,627
	Loans		6,391,189			2,674,997			225,018				65,876				9,357,080
	Earnings assets		6,493,713			2,707,632			225,044				3,646,302				13,072,691
	Deposits		3,284,722			7,416,982			709,786				142,308				11,553,798
	Economic Capital		404,005			212,409			49,313				942,381				1,608,108
																	FirstMerit
	December 31, 2011		Commercial			Retail			Wealth				Other				Consolidated
	OPERATIONS:
	Net interest income		$	265,196		$	225,580		$	18,764			$	(29,913	)		$	479,627
	Provision for loan losses		38,830			21,672			3,479				10,407				74,388
	Noninterest income		57,940			103,248			31,684				31,885				224,757
	Noninterest expense		148,338			235,339			40,004				40,664				464,345
	Net income		88,379			46,681			4,527				(20,029		)		119,558
	AVERAGES:
	Assets		6,203,526			2,935,699			240,952				5,115,153				14,495,330
	Loans		6,201,990			2,661,910			227,710				64,363				9,155,973
	Earnings assets		6,281,589			2,712,133			228,191				3,506,811				12,728,724
	Deposits		3,027,329			7,500,213			644,879				240,080				11,412,501
	Economic Capital		368,434			223,772			50,871				905,276				1,548,353

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Recurring and Nonrecurring Fair Value Measurements	'
	The following tables present the balance of assets and liabilities measured at fair value on a recurring and nonrecurring basis at December 31, 2013 and 2012:
					Fair Value by Hierarchy
		31-Dec-13			Level 1			Level 2			Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	3,036		$	3,036		$	—		$	—
	Nonmarketable equity securities	3,281			—			10			3,271
	U.S. States and political subdivisions	262,367			—			262,367			—
	Residential mortgage-backed securities:
	U.S. government agencies	969,922			—			969,922			—
	Commercial mortgage-backed securities:
	U.S. government agencies	69,567			—			69,567			—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,518,393			—			1,518,393			—
	Nonagency	9			—			—			9
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	102,268			—			102,268			—
	Corporate debt securities	50,644			—			—			50,644
	Asset-backed securities:
	Collateralized loan obligations, nonagency issued	293,687			—			—			293,687
	Total available-for-sale securities	3,273,174			3,036			2,922,527			347,611
	Residential loans held for sale	11,622			—			11,622			—
	Derivative assets:
	Interest rate swaps - nondesignated	46,577			—			46,577			—
	Mortgage loan commitments	891			—			891			—
	Forward sale contracts	384			—			384			—
	Foreign exchange	50			—			50			—
	Total derivative assets	47,902			—			47,902			—
	Total fair value of assets (a)	$	3,332,698		$	3,036		$	2,982,051		$	347,611
	Derivative liabilities:
	Interest rate swaps - fair value hedges	11,574			—			11,574			—
	Interest rate swaps - nondesignated	46,577			—			46,577			—
	Foreign exchange	50			—			50			—
	Total derivative liabilities	58,201			—			58,201			—
	True-up liability	11,463			—			—			11,463
	Total fair value of liabilities (a)	$	69,664		$	—		$	58,201		$	11,463
	Nonrecurring fair value measurement
	Mortgage servicing rights (b)	$	23,041		$	—		$	—		$	23,041
	Impaired loans (c)	47,870			—			—			47,870
	Other property (d)	10,018			—			—			10,018
	Other real estate covered by loss share (e)	8,754			—			—			8,754
	Total fair value	$	89,683		$	—		$	—		$	89,683
	(a) - There were no transfers between levels 1, 2, or 3 of the fair value hierarchy during the year ended December 31, 2013.
	(b) - MSRs with a recorded investment of $22.8 million were reduced by a specific valuation allowance totaling $0.3 million to a reported carrying value of $22.5 million resulting in a recovery of previously recognized expense of $2.3 million included in loans sales and servicing income in the year ended December 31, 2013.
	(c) - Collateral dependent impaired loans with a recorded investment of $52.6 million were reduced by specific valuation allowance allocations totaling $4.8 million to a reported net carrying value of $47.9 million.
	(d) - Amounts do not include assets held at cost at December 31, 2013. During the year ended December 31, 2013, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $1.4 million included in noninterest expense.
	(e) - Amounts do not include assets held at cost at December 31, 2013. During the year ended December 31, 2013, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses $1.0 million included in noninterest expense.
					Fair Value by Hierarchy
		31-Dec-12			Level 1			Level 2			Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	3,241		$	3,241		$	—		$	—
	U.S. States and political subdivisions	268,204			—			268,204			—
	Residential mortgage-backed securities:
	U.S. government agencies	1,107,063			—			1,107,063			—
	Commercial mortgage-backed securities:
	U.S. government agencies	52,036			—			52,036			—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,329,421			—			1,329,421			—
	Nonagency	11			—			2			9
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	111,343			—			111,343			—
	Corporate debt securities	49,652			—			—			49,652
Total available-for-sale securities	2,920,971			3,241			2,868,069			49,661
Residential loans held for sale	23,683			—			23,683			—
Derivative assets:
Interest rate swaps - nondesignated	58,769			—			58,769			—
Mortgage loan commitments	4,400			—			4,400			—
Foreign exchange	62			—			62			—
Total derivative assets	63,231			—			63,231			—
Total fair value of assets (a)	$	3,007,885		$	3,241		$	2,954,983		$	49,661
Derivative liabilities:
Interest rate swaps - fair value hedges	19,080			—			19,080			—
Interest rate swaps - nondesignated	58,769			—			58,769			—
Forward sale contracts	62			—			62			—
Foreign exchange	57			—			57			—
Total derivative liabilities	77,968			—			77,968			—
True-up liability	12,259			—			—			12,259
Total fair value of liabilities (a)	$	90,227		$	—		$	77,968		$	12,259
Nonrecurring fair value measurement
Mortgage servicing rights (b)	$	18,833		$	—		$	—		$	18,833
Impaired loans (c)	54,491			—			—			54,491
Other property (d)	7,540			—			—			7,540
Other real estate covered by loss share (e)	12,631			—			—			12,631
Total fair value	$	93,495		$	—		$	—		$	93,495
(a) - There were no transfers between levels 1,2, or 3 of the fair value hierarchy during the year ended December 31, 2012.
(b) - MSRs with a recorded investment of $21.3 million were reduced by a specific valuation allowance totaling $2.6 million to a reported carrying value of $18.8 million resulting in the recovery of previously recognized expense of $1.0 million included in loan sales and servicing income in the year ended December 31, 2012.
(c) - Collateral dependent impaired loans with a recorded investment of $57.8 million were reduced by specific valuation allowance allocations totaling $3.3 million to a reported net carrying value of $54.5 million.
(d) Amounts do not include assets held at cost at December 31, 2012. During the year ended December 31, 2012, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $2.2 million included in noninterest expense.
(e) Amounts do not include assets held at cost at December 31, 2012. During the year ended December 31, 2012, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $1.7 million included in noninterest expense.
Fair Value, Assets Measured on a Recurring Basis, Unobservable Inputs	'
	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2013 and 2012 are summarized as follows:
		Year Ended
		December 31, 2013						December 31, 2012
		Available-for-sale securities			True-up liability			Available-for-sale securities			True-up liability
	Balance at beginning of period	$	49,661		$	12,259		$	87,539		$	11,551
	Fair value of assets acquired	3,271			—			—			—
	(Gains) losses included in earnings (a)	—			(796		)	—			708
	Unrealized gains (losses) (b)	(2,635		)	—			5,282			—
	Purchases	297,231			—			—			—
	Sales	—			—			(40,520		)	—
	Settlements	82			—			(2,640		)	—
	Net transfers into (out of) Level 3	—			—			—			—
	Balance at ending of period	$	347,610		$	11,463		$	49,661		$	12,259
	(a) Reported in noninterest expense
	(b) Reported in other comprehensive income (loss)
Change in fair value carrying amount of residential mortgages	'
	Interest income on loans held for sale is accrued on the principal outstanding primarily using the “simple-interest” method. None of these loans were 90 days or more past due, nor were any on nonaccrual as of December 31, 2013 and 2012. The aggregate fair value, contractual balance and gain or loss on loans held for sale was as follows:
			December 31, 2013			December 31, 2012
	Aggregate fair value carrying amount		$	11,622		$	23,683
	Aggregate unpaid principal / contractual balance		11,438			22,765
	Carrying amount over aggregate unpaid principal (a)		$	184		$	918
	(a) These changes are included in loan sales and servicing income in the Consolidated Statement of Income.
Fair Value, by Balance Sheet Groupings	'
	The carrying amount and estimated fair value of the Corporation’s financial instruments that are carried at either fair value or cost as of December 31, 2013 and 2012 are shown in the tables below.
		December 31, 2013
		Carrying			Fair Value
		Amount			Total			Level 1			Level 2		Level 3
	Financial assets:
	Cash and due from banks	$	917,822		$	917,822		$	917,822		$	—	$	—
	Available-for-sale securities	3,273,174			3,273,174			3,036			2,922,527		347,611
	Held-to-maturity securities	2,935,688			2,824,240			—			2,824,240		—
	Other securities	180,803			180,803			—			180,803		—
	Loans held for sale	11,622			11,622			—			11,622		—
	Net originated loans	10,116,903			10,017,722			—			—		10,017,722
	Net acquired loans	3,494,874			3,627,275			—			—		3,627,275
	Net covered loans and loss share receivable	547,943			547,943			—			—		547,943
	Accrued interest receivable	52,929			52,929			—			52,929		—
	Derivatives	47,902			47,902			—			47,902		—
	Financial liabilities:
	Deposits	$	19,533,601		$	19,532,368		$	—		$	19,532,368	$	—
	Federal funds purchased and securities sold under agreements to repurchase	851,535			851,535			—			851,535		—
	Wholesale borrowings	200,600			204,124			—			204,124		—
	Long-term debt	324,428			319,711			—			319,711		—
	Accrued interest payable	9,339			9,339			—			9,339		—
	Derivatives	58,201			58,201			—			58,201		—
		December 31, 2012
		Carrying			Fair Value
		Amount			Total			Level 1			Level 2		Level 3
	Financial assets:
	Cash and due from banks	$	258,014		$	258,014		$	258,014		$	—	$	—
	Available for sale securities	2,920,971			2,920,971			3,241			2,868,069		49,661
	Held to maturity securities	622,121			630,799			—			630,799		—
	Other securities	140,717			140,717			—			140,717		—
	Loans held for sale	23,683			23,683			—			23,683		—
	Net noncovered loans	8,632,717			8,604,872			—			—		8,604,872
	Net covered loans and loss share receivable	975,870			975,870			—			—		975,870
	Accrued interest receivable	40,389			40,389			—			40,389		—
	Derivatives	63,231			63,231			—			63,231		—
	Financial liabilities:
	Deposits	$	11,759,425		$	11,765,873		$	—		$	11,765,873	$	—
	Federal funds purchased and securities sold under agreements to repurchase	1,104,525			1,104,525			—			1,104,525		—
	Wholesale borrowings	136,883			143,029			—			143,029		—
	Accrued interest payable	2,515			2,515			—			2,515		—
	Derivatives	77,968			77,968			—			77,968		—

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments Designated as Hedging Instruments	'
	At December 31, 2013 and 2012, the notional values or contractual amounts and fair value of the Corporation's derivatives designated in hedge relationships were as follows:
		Asset Derivatives													Liability Derivatives
		December 31, 2013						December 31, 2012							December 31, 2013					December 31, 2012
		Notional/ Contract Amount			Fair			Notional/ Contract Amount			Fair				Notional/ Contract Amount			Fair		Notional/ Contract Amount		Fair
					Value (a)						Value (a)							Value (b)				Value (b)
	Interest rate swaps:
	Fair value hedges	$	—		$	—		$	—		$	—			$	126,637		$	11,574	$	161,133	$	19,080
	(a) Included in Other Assets on the Consolidated Balance Sheet
	(b) Included in Other Liabilities on the Consolidated Balance Sheet
Derivative Instruments not Designated as Hedging Instruments	'
	As of December 31, 2013 and 2012, the notional values or contractual amounts and fair value of the Corporation's derivatives not designated in hedge relationships were as follows:
		Asset Derivatives													Liability Derivatives
		December 31, 2013						December 31, 2012							December 31, 2013					December 31, 2012
		Notional/ Contract Amount			Fair Value(a)			Notional/ Contract Amount			Fair Value(a)				Notional/ Contract Amount			Fair Value(b)		Notional/ Contract Amount		Fair Value(b)
	Interest rate swaps	$	1,622,525		$	46,577		$	1,204,835		$	58,769			$	1,622,531		$	46,577	$	1,204,835	$	58,769
	Mortgage loan commitments	90,541			891			168,271			4,400				—			—		—		—
	Forward sales contracts	40,906			384			—			—				—			—		124,017		62
	Credit contracts	—			—			—			—				49,914			—		25,225		—
	Foreign exchange	6,478			50			6,662			62				6,893			50		6,026		57
	Other	—			—			—			—				63,813			—		31,492		—
	Total	$	1,760,450		$	47,902		$	1,379,768		$	63,231			$	1,743,151		$	46,627	$	1,391,595	$	58,888
	(a) Included in Other Assets on the Consolidated Balance Sheet
	(b) Included in Other Liabilities on the Consolidated Balance Sheet
Derivative Instruments, Gain (Loss)	'
	Gains and losses recognized in income on nondesignated hedging instruments for the years ended December 31, 2013, 2012 and 2011 are as follows:
	Derivatives not		Location of Gain/(Loss)	Amount of Gain / (Loss) Recognized
	designated as hedging		Recognized	in Income on Derivatives
	instruments		in Income on	Year Ended December 31,
			Derivative	2013			2012			2011
	Mortgage loan commitments		Other operating income	(3,509		)	(559		)	3,576
	Forward sales contracts		Other operating income	446			1,737			(3,904		)
	Foreign exchange contracts		Other operating income	(116		)	189			9
	Other		Other operating expense	—			—			(1,324		)
	Total			$	(3,179	)	$	1,367		$	(1,643	)
Offsetting disclosure for derivatives contracts	'
	Derivative assets and liabilities are recorded at fair value on the balance sheet and do not take into account the effects of master netting agreements the Corporation has with its financial institution counterparties. These master netting agreements allow the Corporation to settle all derivative contracts held with a single financial institution counterparty on a net basis, and to offset net derivative positions with related collateral, where applicable. Collateral, usually in the form of investment securities, is posted by the counterparty with net liability position in accordance with contract thresholds. The following tables illustrate the potential effect of the Corporation's derivative master netting arrangements, by type of financial instrument, on the Corporation's statement of financial position as of December 31, 2013 and 2012. The swap agreements the Corporation has in place with its commercial customers are not subject to enforceable master netting arrangements, and, therefore, are excluded from these tables.
		As of December 31, 2013
		Gross amounts recognized			Gross amounts offset in the consolidated balance sheet			Net amounts presented in the consolidated balance sheet			Gross amounts not offset in the consolidated balance sheet						Net amount
											Financial instruments (a)			Collateral (b)
	Derivative Assets
	Interest rate swaps - nondesignated	$	4,791		$	—		$	4,791		$	(4,791	)	$	—		$	—
	Foreign exchange	4			—			4			(46		)	42			—
	Total derivative assets	$	4,795		$	—		$	4,795		$	(4,837	)	$	42		$	—
	Derivative Liabilities
	Interest rate swaps - designated	$	11,574		$	—		$	11,574		$	—		$	(11,574	)	$	—
	Interest rate swaps - nondesignated	41,787			—			41,787			(4,791		)	(36,996		)	—
	Foreign exchange	46			—			46			(46		)	—			—
	Total derivative liabilities	$	53,407		$	—		$	53,407		$	(4,837	)	$	(48,570	)	$	—
		As of December 31, 2012
		Gross amounts recognized			Gross amounts offset in the consolidated balance sheet			Net amounts presented in the consolidated balance sheet			Gross amounts not offset in the consolidated balance sheet						Net amount
											Financial instruments (a)			Collateral (b)
	Derivative Assets
	Interest rate swaps - nondesignated	$	55		$	—		$	55		$	(55	)	$	—		$	—
	Foreign exchange	14			—			14			(14		)	—			—
	Total derivative assets	$	69		$	—		$	69		$	(69	)	$	—		$	—
	Derivative Liabilities
	Interest rate swaps - designated	$	19,080		$	—		$	19,080		$	—		$	(19,080	)	$	—
	Interest rate swaps - nondesignated	58,714			—			58,714			(55		)	(58,659		)	—
	Foreign exchange	45			—			45			(14		)	(31		)	—
	Total derivative liabilities	$	77,839		$	—		$	77,839		$	(69	)	$	(77,770	)	$	—
	(a) For derivative assets, this includes any derivative liability fair values that could be offset in the event of counterparty default. For derivative liabilities, this includes any derivative asset fair values that could be offset in the event of counterparty default.
	(b) For derivate assets, this includes the fair value of collateral received by the Corporation from the counterparty. Securities received as collateral are not included in the Consolidated Balance Sheet unless the counterparty defaults. For derivative liabilities, this includes the fair value of securities pledged by the Corporation to the counterparty. These securities are included in the Consolidated Balance Sheet unless the Corporation defaults.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of commitments to extend credit [Table Text Block]	'
	The following table shows the remaining contractual amount of each class of commitments to extend credit as of December 31, 2013 and 2012. This amount represents the Corporation's maximum exposure to loss if the customer were to draw upon the full amount of the commitment and subsequently default on payment for the total amount of the then outstanding loan.
			At December 31,
			2013			2012
	Loan Commitments
		Commercial	$	3,367,625		$	2,431,023
		Consumer	2,179,010			1,720,518
		Total loan commitments	$	5,546,635		$	4,151,541
Schedule of Future Minimum Rental Payments for Operating Leases	'
	The Corporation is obligated under various noncancelable operating leases on branch offices. Minimum future rental payments under noncancelable operating leases at December 31, 2013 are as follows:
	Year Ended December 31,		Lease
			Commitments
	2014		$	14,018
	2015		11,871
	2016		9,725
	2017		8,421
	2018		7,007
	2019-2028		19,063
			$	70,105
Schedule of Guarantor Obligations	'
	The Corporation is a guarantor in certain agreements with third parties. The following table shows the types of guarantees the Corporation had outstanding as of December 31, 2013 and 2012.
			At December 31,
			2013			2012
	Financial guarantees
		Standby letters of credit	$	196,400		$	136,202
		Loans sold with recourse	45,082			42,383
		Total financial guarantees	$	241,482		$	178,585
Changes in Repurchase Reserve	'
	Changes in the amount of the repurchase reserve for the years ended December 31, 2013 and 2012 are as follows:
		Year Ended December 31, 2013
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	1,500		$	1,167		$	2,667
	Assumed Obligation	6,000			—			6,000
	Net realized losses	(5,770		)	—			(5,770		)
	Net increase (decrease) to reserve	7,007			(53		)	6,954
	Balance at end of period	$	8,737		$	1,114		$	9,851
		Year ended December 31, 2012
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	470		$	1,273		$	1,743
	Net realized losses	(863		)	—			(863		)
	Net increase (decrease) to reserve	1,893			(106		)	1,787
	Balance at end of period	$	1,500		$	1,167		$	2,667

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Shareholders' Equity [Abstract]	'
Earnings per share	'
		Year Ended December 31,
		2013		2012		2011
	Basic EPS:
	Net income	$	183,684	$	134,106	$	119,558
	Less:
	Cash dividends on 5.875% non-cumulative perpetual series A, preferred stock	5,337		—		—
	Income allocated to participating securities	1,545		—		—
	Net income attributable to common shareholders	$	176,802	$	134,106	$	119,558
	Average Common Stock outstanding used in basic EPS	149,607		109,518		109,102
	Basic net income per share	$	1.18	$	1.22	$	1.1
	Diluted EPS:
	Net income attributable to common shareholders	$	176,802	$	134,106	$	119,558
	Average Common Stock outstanding	149,607		109,518		109,102
	Add: Common Stock equivalents:
	Warrant and stock award plans	814		—		—
	Average Common and Common Stock equivalent shares outstanding	150,421		109,518		109,102
	Diluted net income per share	$	1.18	$	1.22	$	1.1

Changes_and_Reclassifications_1

Changes and Reclassifications Out of Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2013
Changes and Reclassifications Out of Other Comprehensive Income [Abstract]	'
Comprehensive Income (Loss)	'
	The following table presents the changes in AOCI by component of comprehensive income for the year ended December 31, 2013:
		Year Ended December 31, 2013
		Unrealized and realized securities gains and losses			Pension and post- retirement costs			Total
	Balance at the beginning of the period	$	55,418		$	(71,623	)	$	(16,205	)
	Net gain/(loss) arising during the period, net of tax benefit of $46.6 million and tax expense of $16.8 million, respectively	(86,537		)	31,161			(55,376		)
	Net losses realized on sale of securities reclassified to noninterest income, net of tax benefit of $1.0 million	1,822			—			1,822
	Amortization of prior service cost reclassified to other noninterest expense, net of tax expense of $0.0 million.	—			(1		)	(1		)
	Amortization of actuarial gain, net of tax expense of $1.6 million	—			2,884			2,884
	Balance at the end of the period	$	(29,297	)	$	(37,579	)	$	(66,876	)
Reclassification out of Accumulated Other Comprehensive Income	'
	The following table presents current period reclassifications out of AOCI by component of comprehensive income for the year ended December 31, 2013:
		Year Ended December 31, 2013			Statement of Income line item presentation
	Realized (gains) losses on sale of securities	$	2,803		Investment securities losses (gains), net
	Tax expense (benefit) (35%)	(981		)	Income tax expense (benefit)
	Reclassified amount, net of tax	$	1,822

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	'
		Consolidated
		Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2013	Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)	$	2,281,812		13.98	%	>	$	1,305,667		8	%	>	$	1,632,083		10	%
	Tier I Capital
	(to Risk Weighted Assets)	$	1,882,725		11.54	%	>	$	652,833		4	%	>	$	979,250		6	%
	Tier I Capital
	(to Average Assets)	$	1,882,725		8.15	%	>	$	923,887		4	%	>	$	1,154,858		5	%
		Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2012	Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)	$	1,325,971		12.5	%	>	$	848,627		8	%	>	$	1,060,783		10	%
	Tier I Capital
	(to Risk Weighted Assets)	$	1,193,188		11.25	%	>	$	424,313		4	%	>	$	636,470		6	%
	Tier I Capital
	(to Average Assets)	$	1,193,188		8.43	%	>	$	566,212		4	%	>	$	707,765		5	%
	At December 31, 2013 and 2012, the most recent notification from the OCC categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well-capitalized the Bank must maintain minimum total risk-based, Tier I risk-based, and Tier I leverage ratios as set forth in the table. In Management's opinion, there are no conditions or events since the OCC's notification that have changed the Bank's categorization as "well-capitalized."
			Bank Only
			Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2013		Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)		$	2,122,124		13.02	%	>	$	1,303,579		8	%	>	$	1,629,473		10	%
	Tier I Capital
	(to Risk Weighted Assets)		$	1,978,140		12.14	%	>	$	651,789		4	%	>	$	977,684		6	%
	Tier I Capital
	(to Average Assets)		$	1,978,140		8.58	%	>	$	922,312		4	%	>	$	1,152,890		5	%
			Actual						Adequately Capitalized:						Well Capitalized:
	As of December 31, 2012		Amount			Ratio			Amount			Ratio			Amount			Ratio
	Total Capital
	(to Risk Weighted Assets)		$	1,158,312		10.93	%	>	$	847,694		8	%	>	$	1,059,618		10	%
	Tier I Capital
	(to Risk Weighted Assets)		$	1,030,585		9.73	%	>	$	423,847		4	%	>	$	635,771		6	%
	Tier I Capital
	(to Average Assets)		$	1,030,585		7.29	%	>	$	565,414		4	%	>	$	706,768		5	%

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Significant Policies (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified	Branch
Minimum Non Performing Substandard Loans Outstanding for Allowance for Credit Losses	$0.30
Minimum Non Performing Substandard Doubtful Loans Outstanding for Allowance for Credit Losses	0.1
Number of Branches	404
VIE 1	'
Variable Interest Entity-Aggregate Liquidation Amount Outstanding	48.7
VIE 2	'
Variable Interest Entity-Aggregate Liquidation Amount Outstanding	$25.70

Business_Combinations_Business1

Business Combinations Business Combinations (Narrative) (Details) (USD $)

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

9 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Apr. 12, 2013

Apr. 15, 2013

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Apr. 12, 2013

Feb. 04, 2013

Dec. 31, 2012

Apr. 12, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Apr. 12, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Apr. 12, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Apr. 12, 2013

Dec. 31, 2013

Branch

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Michigan and Wisconsin

Acquired Impaired Loans

Acquired Impaired Loans

Acquired Impaired Loans

Junior Subordinated Debt

Junior Subordinated Debt

Minimum

Minimum

Maximum

Maximum

Loans and Finance Receivables [Member]

Property, Plant and Equipment [Member]

Other Assets [Member]

Other Liabilities [Member]

Acquired Impaired Loans

Employee Severance [Member]

professional services [Member]

Contract Termination [Member]

Core Deposits

Acquired Loans

Branch

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Junior Subordinated Debt

Junior Subordinated Debt

Junior Subordinated Debt

Junior Subordinated Debt

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Impaired loans [Member]

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Business Combinations [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles

'

'

'

'

'

'

'

'

'

$84,774,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$70,800,000

'

Business Combination, Acquired Receivables, Fair Value

'

'

'

'

'

'

'

'

'

4,617,004,000

'

'

'

'

'

'

'

819,715,000

'

'

'

'

'

'

'

'

'

'

1,100,000,000

'

'

'

'

'

Goodwill, Purchase Accounting Adjustments

'

'

'

'

'

'

'

5,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-7,300,000

-200,000

1,100,000

-1,000,000

'

'

'

'

'

'

Goodwill, Subsequent Recognition of Deferred Tax Asset

'

'

'

'

'

'

'

3,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

601,000,000

0

819,715,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Asset, Net

'

'

'

'

'

-348,239,000

'

-348,239,000

'

348,200,000

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets

23,909,027,000

14,913,012,000

'

'

'

'

'

'

'

9,600,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Branches

404

'

'

'

'

'

'

'

'

219

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Equity Interest Issued or Issuable, Share Conversion Ratio

'

'

'

'

'

'

'

'

'

1.37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock issued for Citizens acquisition

'

'

'

'

'

'

'

'

'

55,468,283

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of Citizens TARP Preferred Stock

'

'

'

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated but unpaid interest and dividends related to Citizens TARP Preferred Stock

'

'

'

'

'

'

'

'

'

55,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

250,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

4.35%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total gross proceeds from issuance of depositary shares

'

'

'

'

'

'

'

'

'

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate of Non-Cumulative Perpetual Preferred Stock, Series A

'

'

'

'

'

'

'

'

'

'

5.88%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

'

'

'

2,408,203

'

'

'

'

'

2,408,203

'

'

1,757,812.50

2,471,681

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill, Acquired During Period

'

'

'

'

'

279,775,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment

'

'

'

'

'

'

'

'

'

138,536,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent

'

'

'

'

'

'

'

'

'

313,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent

'

'

'

'

'

'

'

'

'

-51,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Tax Assets, Net

329,909,000

7,111,000

'

'

'

'

'

'

'

261,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Operating Loss and Tax Credit Carryforwards included in Acquired Deferred Tax Asset

'

'

'

'

'

'

'

'

'

224,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business combination, deferred tax asset fair market value adjustment

'

'

'

'

'

'

'

'

'

86,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest Income, Operating

'

'

'

'

'

'

'

'

'

'

'

'

'

'

222,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

183,684,000

134,106,000

119,558,000

'

'

'

'

'

'

'

'

'

'

'

106,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Acquisition Related Costs

'

'

'

'

'

'

'

75,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21,600,000

20,200,000

23,600,000

'

'

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,231,172,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

800,000,000

Certain Loans Acquired in Transfer, Nonaccretable Difference

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-279,899,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities

'

'

'

'

'

'

'

'

'

3,202,575,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of securities sold subsequent to acquisition

'

'

'

'

'

'

2,200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of securities subsequent to acquisition

'

'

'

'

'

'

1,500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Federal Home Loan Bank Advances

'

'

'

'

'

'

'

'

'

719,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Federal Home Loan Bank Borrowings

'

'

'

'

652,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal home loan bank advances retained

'

'

'

'

'

'

'

'

66,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Subordinated Debt

'

'

'

'

'

'

'

'

'

74,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Description of Variable Rate Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR

'LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.10%

3.10%

11.75%

11.75%

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

7.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination Recognized Identifiable Assets Acquired And Liabilities Long Term Repurchase Agreements

'

'

'

'

'

'

'

'

'

$115,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business_Combinations_Schedule

Business Combinations Schedule of Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Apr. 12, 2013
Schedule of recognized identifiable assets at acquisition date [Line Items]	'	'	'	'
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	'	'	$925,211,000	'
Adjustments to Additional Paid in Capital, Warrant Issued	'	'	3,000,000	'
Citizens Republic Bancorp	'	'	'	'
Schedule of recognized identifiable assets at acquisition date [Line Items]	'	'	'	'
Business Combination, Acquisition Related Costs	'	'	75,100,000	'
Stock issued for Citizens acquisition	'	'	'	55,468,283
Business Acquisition, Share Price	'	'	'	$16.68
Sale to the Treasury of Newly issued Non-Voting Preferred Shares Part of TARP	'	'	'	355,371,000
Cash paid in lieu of stock to Citizens stockholders at acquisition	'	'	'	61,000
Business Combination, Consideration Transferred	'	1,283,643,000	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	'	'	'	544,380,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	'	'	'	3,202,575,000
Business Combination, Acquired Receivables, Fair Value	'	'	'	4,617,004,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	'	'	'	138,536,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	'	'	84,774,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	'	'	'	680,020,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	'	'	'	9,267,289,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Deposits	'	'	'	7,276,754,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt	'	'	'	908,824,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	'	'	'	77,843,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	'	'	'	8,263,421,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	'	'	'	1,003,868,000
Goodwill, Acquired During Period	279,775,000	'	'	'
professional services [Member] | Citizens Republic Bancorp	'	'	'	'
Schedule of recognized identifiable assets at acquisition date [Line Items]	'	'	'	'
Business Combination, Acquisition Related Costs	'	'	20,200,000	'
Core Deposits | Citizens Republic Bancorp	'	'	'	'
Schedule of recognized identifiable assets at acquisition date [Line Items]	'	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	'	'	70,800,000
Customer Relationships | Citizens Republic Bancorp	'	'	'	'
Schedule of recognized identifiable assets at acquisition date [Line Items]	'	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$14,000,000	'	$14,000,000	$14,000,000

Business_Combinations_Business2

Business Combinations Business Combinations (Acquired Impaired and Non-Impaired Loans at Acquisition Date) (Details) (Citizens Republic Bancorp, USD $)

12 Months Ended

0 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Dec. 31, 2013

Acquired Impaired Loans

Acquired Impaired Loans

Acquired Impaired Loans

Acquired Impaired Loans

Acquired Impaired Loans

Acquired Impaired Loans

Acquired Impaired Loans

Acquired performing loans

Acquired performing loans

Acquired performing loans

Acquired performing loans

Acquired performing loans

Acquired performing loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

non-impaired [Member]

Commercial Loan

Commercial Loan

Commercial Loan

Consumer Loan

Consumer Loan

Consumer Loan

Loans and Finance Receivables [Member]

Commercial and Industrial Financing Receivable

Commercial Real Estate Other Receivable

Commercial Real Estate Construction Financing Receivable

Residential Mortgage

Consumer Installment Financing Receivable

Consumer Home Equity Lines Financing Receivable

Commercial and Industrial Financing Receivable

Commercial Real Estate Other Receivable

Commercial Real Estate Construction Financing Receivable

Residential Mortgage

Consumer Installment Financing Receivable

Consumer Home Equity Lines Financing Receivable

Commercial and Industrial Financing Receivable

Commercial Real Estate Other Receivable

Commercial Real Estate Construction Financing Receivable

Residential Mortgage

Consumer Installment Financing Receivable

Consumer Home Equity Lines Financing Receivable

Acquired Impaired Loans

Acquired performing loans

Acquired Loans

Acquired Impaired Loans

Acquired performing loans

Acquired Loans

Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Acquired Receivables, Gross Contractual Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,017,304

'

'

'

'

'

'

'

Goodwill, Purchase Accounting Adjustments

5,400

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

220,015

'

'

'

'

'

'

-7,300

Business Combination, Acquired Receivables, Fair Value

'

$4,617,004

$819,715

$93,735

$378,569

$13,399

$232,291

$54,108

$47,613

$1,660,199

$359,066

$17,135

$278,404

$1,165,235

$317,250

$4,617,004

$1,753,934

$737,635

$30,534

$510,695

$1,219,343

$364,863

$3,797,289

$485,703

$2,036,400

$2,522,103

$334,012

$1,760,889

$2,094,901

'

Business_Combinations_Acquired

Business Combinations Acquired Impaired Loans Fair Value at Acquisition Date (Details) (Citizens Republic Bancorp, USD $)	12 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Apr. 12, 2013	Apr. 12, 2013
			non-impaired [Member]
Fair Value Adjustment for Acquired Non-Impaired Loans [Line Items]	'	'	'
Receivables Carrying Value at Acquisition Date	'	'	$4,017,304
Goodwill, Purchase Accounting Adjustments	5,400	'	220,015
Business Combination, Acquired Receivables, Fair Value	'	$4,617,004	$3,797,289

Business_Combinations_Nonimpai

Business Combinations Nonimpaired Cash Flows Reconciliation at Acquisition Date (Details) (Citizens Republic Bancorp, non-impaired [Member], USD $)	Apr. 12, 2013
In Thousands, unless otherwise specified
Citizens Republic Bancorp | non-impaired [Member]	'
Nonimpaired Loans Cash Flows Reconciliation at Acquisition Date [Line Items]	'
Business Combination, Acquired Receivables, Gross Contractual Amount	$4,955,180
Business Combination, Acquired Receivables, Estimated Uncollectible	680,664
Contractually required payments at acquisition date, net of uncollectibles	$4,274,516

Business_Combinations_Business3

Business Combinations Business Combinations (Reconciliation of Carrying Amounts of Acquired Loans) (Details) (Acquired Impaired Loans, USD $)	Dec. 31, 2013	Dec. 31, 2012	Apr. 12, 2013
In Thousands, unless otherwise specified			Citizens Republic Bancorp
Reconciliation of Carrying Amount of Acquired Loans [Line Items]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	'	'	$1,231,172
Certain Loans Acquired in Transfer, Nonaccretable Difference	'	'	-279,899
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	'	'	951,273
Certain Loans Acquired in Transfer, Accretable Yield	-136,646	0	-131,558
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$601,000	$0	$819,715

Business_Combinations_Business4

Business Combinations Business Combinations (Acquisition Proforma Details) (Details) (Citizens Republic Bancorp, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Citizens Republic Bancorp	'	'
Business Acquisition, Pro-forma Information [Line Items]	'	'
Business Acquisition, Pro Forma Revenue	$1,096,960,000	$1,254,594,000
Business Acquisition, Pro Forma Net Income (Loss)	196,744,000	609,259,000
Business Acquisition, pro forma, tax benefits	'	$276,800,000

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details Textual) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]	'	'
Available for sale securities, net unrealized losses	($55,900,000)	'
Available for sale securities, net unrealized gains	'	72,200,000
Number of Single Issuer Trust Preferred Securities With Stated Maturities	8	'
Investment Securities	'	'
Other investment securities pledged	3,200,000,000	1,600,000,000
Number of states with aggregate fair value of general obligation bonds greater than $10 million	12	'
Total number of states general obligation bonds are held	38	'
Revenue bonds, number owned by corporation	1	'
Revenue bond, fair value	600,000	'
Revenue bond, amortized cost	500,000	'
Maximum portfolio concentration in municipal securities per corporate investment policy	20.00%	'
Amount of municipal securities with a combined individual state to total municipal outstanding equal to or less than, per corporate policy	25.00%	'
Percent of trust preferred securities included in fair value of entire investment portfolio	2.00%	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,908,543,000	213,685,000
Available-for-sale Securities, Gross Unrealized Loss at End of Period	90,220,000	12,922,000
Corporate bonds	'	'
Investment Securities	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	10,952,000	11,889,000
12 States	'	'
Investment Securities	'	'
General obligation bonds, fair value	$10,000,000	'

Investment_Securities_Amortize

Investment Securities (Amortized Cost Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	$3,329,117	$2,848,771
Available-for-sale Securities, Fair Value	3,273,174	2,920,971
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	2,935,688	622,121
Held-to-maturity Securities, Fair Value	2,935,688	622,121
Held-to-maturity Securities, Fair Value	2,824,240	630,799
Available-for-sale Securities, Gross Unrealized Gain at End of Period	34,277	85,122
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-90,220	-12,922
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	6,761	8,764
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	118,209	86
U.S. Government agencies	'	'
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	25,000	'
Held-to-maturity Securities, Fair Value	23,652	'
Held-to-maturity Securities, Fair Value	23,652	'
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	'
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	1,348	'
U.S. States and political subdivisions	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	258,787	253,198
Available-for-sale Securities, Fair Value	262,367	268,204
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	480,703	270,005
Held-to-maturity Securities, Fair Value	475,579	275,061
Held-to-maturity Securities, Fair Value	475,579	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	7,376	15,235
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-3,796	-229
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	5,335	5,126
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	10,459	70
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	962,687	1,058,005
Available-for-sale Securities, Fair Value	969,922	1,107,063
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	569,960	'
Held-to-maturity Securities, Fair Value	559,451	'
Held-to-maturity Securities, Fair Value	559,451	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	21,662	49,058
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-14,427	0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	1,108	'
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	11,617	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	72,048	52,014
Available-for-sale Securities, Fair Value	69,567	52,036
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	56,596	33,165
Held-to-maturity Securities, Fair Value	55,406	33,977
Held-to-maturity Securities, Fair Value	55,406	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	7	428
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-2,488	-406
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	812
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	1,190	0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	1,566,262	1,311,501
Available-for-sale Securities, Fair Value	1,518,393	1,329,421
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	1,464,732	123,563
Held-to-maturity Securities, Fair Value	1,382,914	124,080
Held-to-maturity Securities, Fair Value	1,382,914	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	4,199	18,180
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-52,068	-260
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	533
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	81,818	16
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	9	11
Available-for-sale Securities, Fair Value	9	11
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	0	'
Held-to-maturity Securities, Fair Value	0	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	104,152	109,260
Available-for-sale Securities, Fair Value	102,268	111,343
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	240,069	98,924
Held-to-maturity Securities, Fair Value	229,023	99,696
Held-to-maturity Securities, Fair Value	229,023	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	273	2,221
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-2,157	-138
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	6	772
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	11,052	0
Collateralized Loan Obligations	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	297,259	'
Available-for-sale Securities, Fair Value	293,687	'
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	0	'
Held-to-maturity Securities, Fair Value	0	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	760	'
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-4,332	'
Corporate bonds	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	61,596	61,541
Available-for-sale Securities, Fair Value	50,644	49,652
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	93,628	96,464
Held-to-maturity Securities, Fair Value	93,211	97,985
Held-to-maturity Securities, Fair Value	93,211	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-10,952	-11,889
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	308	1,521
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	725	0
Total debt securities	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	3,322,800	2,845,530
Available-for-sale Securities, Fair Value	3,266,857	2,917,730
Securities held to maturity	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	34,277	85,122
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-90,220	-12,922
Marketable equity securities	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	3,036	3,241
Available-for-sale Securities, Fair Value	3,036	3,241
Securities held to maturity	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	0
Non-marketable equity securities	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	3,281	'
Available-for-sale Securities, Fair Value	3,281	'
Securities held to maturity	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	'
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	'
Total equity securities	'	'
Securities available for sale	'	'
Available-for-sale Securities, Amortized Cost	6,317	'
Available-for-sale Securities, Fair Value	6,317	'
Securities held to maturity	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	'
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	'
U.S. Treasury obligations	'	'
Securities held to maturity	'	'
Held-to-maturity Securities, Amortized Cost	5,000	'
Held-to-maturity Securities, Fair Value	5,004	'
Held-to-maturity Securities, Fair Value	5,004	'
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	4	'
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	$0	'

Investment_Securities_Investme

Investment Securities Investment Securities (Schedule of general obligation bonds) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	890	546
General obligation bonds, average issue size, fair value	$829	$994
General obligation bonds, amortized cost	739,490	523,203
General obligation bonds, fair value	737,946	543,265
MICHIGAN	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	166	127
General obligation bonds, average issue size, fair value	744	1,167
General obligation bonds, amortized cost	122,198	144,789
General obligation bonds, fair value	123,571	148,264
OHIO	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	154	42
General obligation bonds, average issue size, fair value	1,041	1,366
General obligation bonds, amortized cost	159,674	55,207
General obligation bonds, fair value	160,265	57,365
ILLINOIS	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	75	55
General obligation bonds, average issue size, fair value	1,314	970
General obligation bonds, amortized cost	96,863	51,932
General obligation bonds, fair value	98,521	53,348
TEXAS	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	69	53
General obligation bonds, average issue size, fair value	771	931
General obligation bonds, amortized cost	54,295	47,613
General obligation bonds, fair value	53,204	49,326
WISCONSIN	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	87	28
General obligation bonds, average issue size, fair value	645	1,096
General obligation bonds, amortized cost	54,921	28,572
General obligation bonds, fair value	56,152	30,687
PENNSYLVANIA	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	51	40
General obligation bonds, average issue size, fair value	891	719
General obligation bonds, amortized cost	48,319	27,348
General obligation bonds, fair value	45,451	28,756
MINNESOTA	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	45	33
General obligation bonds, average issue size, fair value	663	856
General obligation bonds, amortized cost	29,840	26,541
General obligation bonds, fair value	29,816	28,232
WASHINGTON	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	30	22
General obligation bonds, average issue size, fair value	930	1,233
General obligation bonds, amortized cost	28,393	26,104
General obligation bonds, fair value	27,906	27,130
NEW JERSEY	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	38	22
General obligation bonds, average issue size, fair value	722	907
General obligation bonds, amortized cost	27,101	18,976
General obligation bonds, fair value	27,440	19,958
MISSOURI	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	20	10
General obligation bonds, average issue size, fair value	969	1,482
General obligation bonds, amortized cost	19,253	13,809
General obligation bonds, fair value	19,382	14,815
NEW YORK	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	22	18
General obligation bonds, average issue size, fair value	585	639
General obligation bonds, amortized cost	13,064	11,027
General obligation bonds, fair value	12,878	11,507
CALIFORNIA	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	18	11
General obligation bonds, average issue size, fair value	599	930
General obligation bonds, amortized cost	10,651	9,734
General obligation bonds, fair value	10,788	10,231
Other states	'	'
general obligation bonds [Line Items]	'	'
General Obligation Bonds number of issuers	115	85
General obligation bonds, average issue size, fair value	631	742
General obligation bonds, amortized cost	74,918	61,551
General obligation bonds, fair value	$72,572	$63,646

Investment_Securities_Other_In

Investment Securities (Other Investments Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other investments	'	'
FRB stock	$55,294	$21,045
FHLB stock	125,032	119,145
Other	477	527
Total other investments	$180,803	$140,717

Investment_Securities_Realized

Investment Securities (Realized Gain Loss Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Proceeds and gross unrealized gains and losses on sales of available-for-sale securities	'	'	'
Realized gains	$3,786	$3,786	$11,251
Realized losses	-6,589	0	-170
Net securities gains	($2,803)	$3,786	$11,081

Investment_Securities_Gross_Un

Investment Securities (Gross Unrealized Loss Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	securities	securities
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$1,908,543	$213,685
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-67,758	-1,031
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	218	41
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	199,691	50,056
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-22,462	-11,891
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	46	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,108,234	263,741
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-90,220	-12,922
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,373,148	23,956
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-118,026	-86
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	492	13
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,478	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	-183	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	6	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	2,375,626	23,956
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-118,209	-86
U.S. Government agencies	'	'
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	23,652	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-1,348	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	1	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	0	'
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	23,652	'
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-1,348	'
U.S. States and political subdivisions	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	38,039	14,110
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-1,996	-229
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	65	24
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14,157	0
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-1,800	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	25	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	52,196	14,110
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-3,796	-229
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	222,154	6,543
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-10,276	-70
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	353	12
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,478	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	-183	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	6	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	224,632	6,543
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-10,459	-70
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	434,761	14
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-13,109	0
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	35	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14,890	13
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-1,318	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	2	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	449,651	27
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-14,427	0
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	422,192	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-11,617	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	22	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	0	'
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	422,192	'
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-11,617	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	33,387	31,237
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-1,491	-406
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	5	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	16,944	0
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-997	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	2	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	50,331	31,237
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-2,488	-406
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	48,831	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-1,190	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	8	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	0	'
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	48,831	'
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-1,190	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,135,151	133,008
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-44,775	-258
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	74	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	100,530	389
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-7,293	-2
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	7	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,235,681	133,397
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-52,068	-260
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	1,402,172	17,413
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-82,558	-16
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	67	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	0	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	1,402,172	17,413
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-82,558	-16
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	0	0
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1	2
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	0	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	0	0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	43,747	35,316
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-2,055	-138
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	6	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,525	0
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-102	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	46,272	35,316
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-2,157	-138
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	189,606	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-10,312	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	18	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	0	'
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	189,606	'
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-10,312	'
Collateralized Loan Obligations	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	223,458	'
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-4,332	'
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	33	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	0	'
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	223,458	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-4,332	'
Corporate bonds	'	'
Securities available for sale	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	0	0
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	50,644	49,652
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-10,952	-11,889
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	8	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	50,644	49,652
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-10,952	-11,889
Securities held to maturity	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	64,541	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss as of Period End	-725	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	23	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss at End of Period	0	'
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	64,541	'
Held-to-Maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	($725)	'

Investment_Securities_Maturiti

Investment Securities (Maturities Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Securities Available for Sale	'	'
One year or less	$59,781	'
Over one year through five years	2,206,321	'
Over five years through ten years	899,078	'
Over ten years	101,677	'
Fair Value	3,266,857	'
Available-for-sale	3,273,174	2,920,971
Weighted Average Yield, one year or less	3.10%	'
Weighted Average Yield, over one year through five years	2.24%	'
Weighted Average Yield, over five years through ten years	2.85%	'
Weighted Average Yield, over ten years	2.26%	'
Weighted Average Yield, Total	2.42%	'
Available-for-sale Securities, Amortized Cost Basis	3,329,117	2,848,771
Weighted-Average Yield	2.42%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'4 years 9 months 15 days	'
Securities Held to Maturity	'	'
One year or less	75,261	'
Over one year through five years	1,731,845	'
Over five years through ten years	842,899	'
Over ten years	174,235	'
Fair Value	2,824,240	630,799
Weighted Average Yield, one year or less	1.50%	'
Weighted Average Yield, over one year through five years	1.78%	'
Weighted Average Yield, over five years through ten years	2.38%	'
Weighted Average Yield, over ten years	5.40%	'
Weighted Average Yield, Total	2.17%	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,935,688	622,121
Held-to-maturity	2,935,688	622,121
Held to Maturity Securities Debt Maturities Weighted Average Yield	2.17%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'5 years 6 months 1 day	'
U.S. Government agencies	'	'
Securities Available for Sale	'	'
One year or less	0	'
Over one year through five years	0	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	0	'
Amortized Cost	0	'
Weighted-Average Yield	0.00%	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	0	'
Over five years through ten years	23,652	'
Over ten years	0	'
Fair Value	23,652	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	25,000	'
Held-to-maturity	23,652	'
Held to Maturity Securities Debt Maturities Weighted Average Yield	1.43%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'5 years 9 months 30 days	'
U.S. Treasury obligations	'	'
Securities Available for Sale	'	'
One year or less	0	'
Over one year through five years	0	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	0	'
Amortized Cost	0	'
Weighted-Average Yield	0.00%	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	5,004	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	5,004	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	5,000	'
Held-to-maturity	5,004	'
Held to Maturity Securities Debt Maturities Weighted Average Yield	0.26%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'1 year 0 months 29 days	'
U.S. States and political subdivisions	'	'
Securities Available for Sale	'	'
One year or less	11,901	'
Over one year through five years	53,498	'
Over five years through ten years	166,913	'
Over ten years	30,055	'
Available-for-sale	262,367	268,204
Available-for-sale Securities, Amortized Cost Basis	258,787	253,198
Weighted-Average Yield	5.10%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'6 years 11 months 13 days	'
Securities Held to Maturity	'	'
One year or less	75,261	'
Over one year through five years	45,746	'
Over five years through ten years	180,337	'
Over ten years	174,235	'
Fair Value	475,579	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	480,703	270,005
Held-to-maturity	475,579	275,061
Held to Maturity Securities Debt Maturities Weighted Average Yield	4.72%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'10 years 11 months 16 days	'
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities Available for Sale	'	'
One year or less	1,555	'
Over one year through five years	768,747	'
Over five years through ten years	199,620	'
Over ten years	0	'
Fair Value	969,922	'
Available-for-sale	969,922	1,107,063
Available-for-sale Securities, Amortized Cost Basis	962,687	1,058,005
Weighted-Average Yield	2.75%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'4 years 2 months 17 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	351,715	'
Over five years through ten years	207,736	'
Over ten years	0	'
Fair Value	559,451	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	569,960	'
Held-to-maturity	559,451	'
Held to Maturity Securities Debt Maturities Weighted Average Yield	2.12%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'5 years 3 months 23 days	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities Available for Sale	'	'
One year or less	16,944	'
Over one year through five years	19,237	'
Over five years through ten years	33,386	'
Over ten years	0	'
Fair Value	69,567	'
Available-for-sale	69,567	52,036
Available-for-sale Securities, Amortized Cost Basis	72,048	52,014
Weighted-Average Yield	2.09%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'3 years 11 months 28 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	15,007	'
Over five years through ten years	40,399	'
Over ten years	0	'
Fair Value	55,406	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	56,596	33,165
Held-to-maturity	55,406	33,977
Held to Maturity Securities Debt Maturities Weighted Average Yield	1.79%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'5 years 7 months 25 days	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities Available for Sale	'	'
One year or less	4,830	'
Over one year through five years	1,245,303	'
Over five years through ten years	268,260	'
Over ten years	0	'
Fair Value	1,518,393	'
Available-for-sale	1,518,393	1,329,421
Available-for-sale Securities, Amortized Cost Basis	1,566,262	1,311,501
Weighted-Average Yield	1.86%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'4 years 2 months 21 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	1,105,292	'
Over five years through ten years	277,622	'
Over ten years	0	'
Fair Value	1,382,914	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	1,464,732	123,563
Held-to-maturity	1,382,914	124,080
Held to Maturity Securities Debt Maturities Weighted Average Yield	1.56%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'4 years 7 months 3 days	'
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'	'
Securities Available for Sale	'	'
One year or less	0	'
Over one year through five years	9	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	9	'
Available-for-sale	9	11
Available-for-sale Securities, Amortized Cost Basis	9	11
Weighted-Average Yield	3.65%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'1 year 9 months 23 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	0	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	0	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	0	'
Held to Maturity Securities Debt Maturities Weighted Average Yield	0.00%	'
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'
Securities Available for Sale	'	'
One year or less	0	'
Over one year through five years	79,688	'
Over five years through ten years	22,580	'
Over ten years	0	'
Fair Value	102,268	'
Available-for-sale	102,268	111,343
Available-for-sale Securities, Amortized Cost Basis	104,152	109,260
Weighted-Average Yield	1.65%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'4 years 4 months 26 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	115,870	'
Over five years through ten years	113,153	'
Over ten years	0	'
Fair Value	229,023	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	240,069	98,924
Held-to-maturity	229,023	99,696
Held to Maturity Securities Debt Maturities Weighted Average Yield	2.27%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'5 years 2 months 24 days	'
Collateralized Loan Obligations	'	'
Securities Available for Sale	'	'
One year or less	24,551	'
Over one year through five years	39,839	'
Over five years through ten years	208,319	'
Over ten years	20,978	'
Fair Value	293,687	'
Available-for-sale	293,687	'
Available-for-sale Securities, Amortized Cost Basis	297,259	'
Weighted-Average Yield	2.66%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'6 years 2 months 17 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	0	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	0	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	0	'
Held to Maturity Securities Debt Maturities Weighted Average Yield	0.00%	'
Corporate bonds	'	'
Securities Available for Sale	'	'
One year or less	0	'
Over one year through five years	0	'
Over five years through ten years	0	'
Over ten years	50,644	'
Fair Value	50,644	'
Available-for-sale	50,644	49,652
Available-for-sale Securities, Amortized Cost Basis	61,596	61,541
Weighted-Average Yield	0.96%	'
Available for Sale Securities, Debt Maturities, Weighted-Average Maturity	'13 years 9 months 23 days	'
Securities Held to Maturity	'	'
One year or less	0	'
Over one year through five years	93,211	'
Over five years through ten years	0	'
Over ten years	0	'
Fair Value	93,211	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	93,628	96,464
Held-to-maturity	$93,211	$97,985
Held to Maturity Securities Debt Maturities Weighted Average Yield	2.22%	'
Held to Maturity Securities Debt Maturities Weighted Average Maturity	'4 years 0 months 14 days	'

Loans_Details_Textual

Loans (Details Textual) (USD $)

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2013

Acquired Loans

Covered Loans

Covered Loans

Covered Loans

Loss Share Receivable

Loss Share Receivable

Acquired Loans

Acquired Loans

Covered Loans

Covered Loans

Covered Loans

Impaired loans [Member]

Acquired Loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums

$6,600,000

($6,500,000)

'

'

'

'

'

'

'

'

'

'

'

'

Loans and Leases Receivable, Allowance, Covered

'

'

'

44,027,000

43,255,000

36,417,000

'

'

'

'

44,027,000

43,255,000

'

'

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference

'

'

'

'

'

'

'

'

'

'

34,965,000

38,177,000

'

'

Loans (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding balance, including contractual principal, interest, fees and penalties, of all purchased loans

'

'

'

'

'

'

'

'

'

'

'

'

1,166,570,000

800,000,000

Covered Loans Loss Share Receivable

'

'

'

'

113,700,000

'

61,827,000

113,734,000

'

'

'

'

'

'

Loans

$14,300,972,000

$9,750,784,000

$756,100,000

'

'

'

'

'

$3,495,615,000

$0

'

'

'

'

Time period for non-payment of loans that are placed on non-accrual status

'90 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Days past due for nonaccrual status credit card loans

'120 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans_Total_Originated_Acquire

Loans (Total Originated, Acquired and Covered Loans Outstanding Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	$8,750,109,000	$6,584,926,000	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	1,050,584,000	506,751,000	'
Loans and Leases Receivable, Gross, Consumer, Installment, Other	2,738,656,000	1,336,447,000	'
Loans and Leases Receivable, Gross, Consumer, Home Equity	1,311,932,000	923,303,000	'
FDIC Indemnification Asset	61,827,000	113,734,000	'
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	148,313,000	146,387,000	'
Loans and Leases Receivable, Gross, Consumer, Lease Financing	239,551,000	139,236,000	'
Loans and Leases Receivable, Gross	14,300,972,000	9,750,784,000	'
Allowance for loan losses	-141,252,000	-142,197,000	'
Net loans	14,159,720,000	9,608,587,000	'
FirstBank Loans	49,200,000	54,200,000	'
Originated Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	6,648,279,000	5,866,489,000	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	529,253,000	445,211,000	'
Loans and Leases Receivable, Gross, Consumer, Installment, Other	1,727,925,000	1,328,258,000	'
Loans and Leases Receivable, Gross, Consumer, Home Equity	920,066,000	806,078,000	'
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	148,313,000	146,387,000	'
Loans and Leases Receivable, Gross, Consumer, Lease Financing	239,551,000	139,236,000	'
Loans and Leases Receivable, Gross	10,213,387,000	8,731,659,000	'
Allowance for loan losses	-96,484,000	-98,942,000	'
Net loans	10,116,903,000	8,632,717,000	'
Acquired Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	1,725,970,000	0	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	470,652,000	0	'
Loans and Leases Receivable, Gross, Consumer, Installment, Other	1,004,569,000	0	'
Loans and Leases Receivable, Gross, Consumer, Home Equity	294,424,000	0	'
Loans and Leases Receivable, Gross	3,495,615,000	0	'
Allowance for loan losses	-741,000	0	'
Net loans	3,494,874,000	0	'
Covered Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	375,860,000	718,437,000	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	50,679,000	61,540,000	'
Loans and Leases Receivable, Gross, Consumer, Installment, Other	6,162,000	8,189,000	'
Loans and Leases Receivable, Gross, Consumer, Home Equity	97,442,000	117,225,000	'
FDIC Indemnification Asset	'	113,734,000	'
Net loans	547,943,000	975,870,000	'
Loans and Leases Receivable, Gross, Carrying Amount, Covered	591,970,000	1,019,125,000	'
Loans and Leases Receivable, Allowance, Covered	-44,027,000	-43,255,000	'
Covered Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
FDIC Indemnification Asset	61,827,000	'	'
Loans and Leases Receivable, Allowance, Covered	($44,027,000)	($43,255,000)	($36,417,000)

Loans_Summary_of_Loans_to_Rela

Loans (Summary of Loans to Related Parties Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans and Leases Receivable, Related Parties [Roll Forward]	'	'	'
Aggregate amount at beginning of year	$16,578	$15,629	$15,723
New loans	11,507	3,500	2,458
Repayments	-4,374	-2,739	-2,552
Changes in directors and their affiliations	825	188	0
Aggregate amount at end of year	$24,536	$16,578	$15,629

Loans_Loans_Changes_in_the_car

Loans Loans (Changes in the carrying amount and accretable yield for acquired impaired loans) (Details) (USD $)	12 Months Ended			12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Apr. 12, 2013
	Covered Loans	Covered Loans	Covered Loans	Acquired Impaired Loans	Acquired Impaired Loans	Acquired Impaired Loans
						Citizens Republic Bancorp
Changes in the carrying amount and accretable yield for acquired impaired loans [Line Items]	'	'	'	'	'	'
Certain Loans Acquired in Transfer, Accretable Yield	$67,283	$113,288	$176,736	$136,646	$0	$131,558
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	403,692	762,386	1,128,978	601,000	0	819,715
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	-64,528	-96,748	'	-27,144	'	'
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Accretion	64,528	96,748	'	27,144	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	34,965	38,177	'	46,361	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities F D I C Payments Received under Loss Sharing Agreement	-423,222	-463,340	'	-245,859	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	($16,442)	($4,877)	'	($14,129)	'	'

Loans_Loans_Changes_in_Loss_Sh

Loans Loans (Changes in Loss Share Receivable Associated with Covered Loans Table) (Details) (Loss Share Receivable, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Share Receivable	'	'	'
Changes in Loss Share Receivable Associated with Covered Loans [Line Items]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	'	$113,734	$205,664
Changes in Loss Share Receivable [Roll Forward]	'	'	'
Amortization	-24,307	-34,903	'
Increase due to impairment on covered loans	10,790	14,728	'
FDIC reimbursement	-27,234	-58,099	'
Covered loans paid in full	-11,156	-13,656	'
Balance at end of period	$61,827	$113,734	'

Loans_Loans_Changes_in_the_car1

Loans Loans (Changes in the carrying amount and accretable yield for covered loans) (Details) (Covered Loans, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Covered Loans	'	'	'
Changes in the carrying amount of accretable yield for covered loans [Line Items]	'	'	'
Certain Loans Acquired in Transfer, Accretable Yield	$67,283	$113,288	$176,736
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	403,692	762,386	1,128,978
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	-64,528	-96,748	'
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Accretion	64,528	96,748	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	34,965	38,177	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities F D I C Payments Received under Loss Sharing Agreement	-423,222	-463,340	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	($16,442)	($4,877)	'

Loans_Past_Due_Financing_Recei

Loans (Past Due Financing Receivables Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Consumer Loans Guaranteed by Government	$2,100,000	$3,400,000
FDIC Indemnification Asset	61,827,000	113,734,000
Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	36,548,000
Days Past Due 60 to 89	'	13,635,000
Days Past Due more than 90	'	28,754,000
Total Past Due	'	78,937,000
Current	'	8,652,722,000
Total Loans	10,213,387,000	8,731,659,000
More than 90 days Past Due and Accruing	'	9,417,000
Nonaccrual Loans	'	36,687,000
Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	52,585,000	'
Days Past Due 60 to 89	10,926,000	'
Days Past Due more than 90	35,888,000	'
Total Past Due	99,399,000	'
Current	10,113,988,000	'
Total Loans	10,213,387,000	'
More than 90 days Past Due and Accruing	11,176,000	'
Nonaccrual Loans	42,203,000	'
Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	32,793,000	'
Days Past Due 60 to 89	13,578,000	'
Days Past Due more than 90	45,133,000	'
Total Past Due	91,504,000	'
Current	3,404,111,000	'
Total Loans	3,495,615,000	'
More than 90 days Past Due and Accruing	4,148,000	'
Nonaccrual Loans	4,007,000	'
Covered Loans	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
FDIC Indemnification Asset	61,827,000	'
Covered Loans Loss Share Receivable	'	113,700,000
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	13,922,000	17,184,000
Days Past Due 60 to 89	9,881,000	25,086,000
Days Past Due more than 90	143,238,000	240,864,000
Total Past Due	167,041,000	283,134,000
Current	363,102,000	622,257,000
Total Loans	530,143,000	905,391,000
Covered Loans	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
FDIC Indemnification Asset	'	113,734,000
Commercial and Industrial Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	3,814,000
Days Past Due 60 to 89	'	1,986,000
Days Past Due more than 90	'	3,571,000
Total Past Due	'	9,371,000
Current	'	3,297,155,000
Total Loans	'	3,306,526,000
More than 90 days Past Due and Accruing	'	104,000
Nonaccrual Loans	'	5,255,000
Commercial and Industrial Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	8,941,000	'
Days Past Due 60 to 89	994,000	'
Days Past Due more than 90	10,622,000	'
Total Past Due	20,557,000	'
Current	4,119,010,000	'
Total Loans	4,139,567,000	'
More than 90 days Past Due and Accruing	151,000	'
Nonaccrual Loans	11,323,000	'
Commercial and Industrial Financing Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	1,295,000	'
Days Past Due 60 to 89	862,000	'
Days Past Due more than 90	3,744,000	'
Total Past Due	5,901,000	'
Current	788,178,000	'
Total Loans	794,079,000	'
More than 90 days Past Due and Accruing	40,000	'
Nonaccrual Loans	795,000	'
Commercial and Industrial Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	836,000	931,000
Days Past Due 60 to 89	1,489,000	981,000
Days Past Due more than 90	12,957,000	24,111,000
Total Past Due	15,282,000	26,023,000
Current	60,955,000	102,486,000
Total Loans	76,237,000	128,509,000
Commercial Real Estate Other Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	4,181,000
Days Past Due 60 to 89	'	4,530,000
Days Past Due more than 90	'	11,535,000
Total Past Due	'	20,246,000
Current	'	2,204,170,000
Total Loans	'	2,224,416,000
More than 90 days Past Due and Accruing	'	382,000
Nonaccrual Loans	'	15,780,000
Commercial Real Estate Other Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	4,507,000	'
Days Past Due 60 to 89	2,400,000	'
Days Past Due more than 90	9,688,000	'
Total Past Due	16,595,000	'
Current	2,153,192,000	'
Total Loans	2,169,787,000	'
More than 90 days Past Due and Accruing	460,000	'
Nonaccrual Loans	14,229,000	'
Commercial Real Estate Other Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	5,603,000	'
Days Past Due 60 to 89	5,281,000	'
Days Past Due more than 90	26,366,000	'
Total Past Due	37,250,000	'
Current	881,395,000	'
Total Loans	918,645,000	'
More than 90 days Past Due and Accruing	403,000	'
Nonaccrual Loans	651,000	'
Commercial Real Estate Other Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	2,855,000	4,130,000
Days Past Due 60 to 89	3,443,000	15,019,000
Days Past Due more than 90	103,077,000	172,444,000
Total Past Due	109,375,000	191,593,000
Current	164,219,000	348,002,000
Total Loans	273,594,000	539,595,000
Commercial Real Estate Construction Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Total Loans	'	335,547,000
Commercial Real Estate Construction Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Total Loans	338,925,000	'
Commercial Real Estate Construction Financing Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	2,675,000	'
Total Past Due	2,675,000	'
Current	10,571,000	'
Total Loans	13,246,000	'
Commercial Real Estate Construction Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Total Loans	26,029,000	50,333,000
Commercial Construction Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	981,000
Days Past Due 60 to 89	'	0
Days Past Due more than 90	'	597,000
Total Past Due	'	1,578,000
Current	'	333,969,000
Total Loans	'	335,547,000
More than 90 days Past Due and Accruing	'	0
Nonaccrual Loans	'	731,000
Commercial Construction Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	351,000	'
Days Past Due 60 to 89	21,000	'
Days Past Due more than 90	66,000	'
Total Past Due	438,000	'
Current	338,487,000	'
Total Loans	338,925,000	'
More than 90 days Past Due and Accruing	0	'
Nonaccrual Loans	122,000	'
Commercial Construction Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	2,191,000	589,000
Days Past Due 60 to 89	1,917,000	7,925,000
Days Past Due more than 90	20,388,000	34,314,000
Total Past Due	24,496,000	42,828,000
Current	1,533,000	7,505,000
Total Loans	26,029,000	50,333,000
Commercial Leases Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	6,000
Days Past Due 60 to 89	'	0
Days Past Due more than 90	'	0
Total Past Due	'	6,000
Current	'	139,230,000
Total Loans	'	139,236,000
More than 90 days Past Due and Accruing	'	0
Nonaccrual Loans	'	0
Commercial Leases Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	902,000	'
Days Past Due 60 to 89	0	'
Days Past Due more than 90	0	'
Total Past Due	902,000	'
Current	238,649,000	'
Total Loans	239,551,000	'
More than 90 days Past Due and Accruing	0	'
Nonaccrual Loans	0	'
Commercial Leases Financing Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Total Loans	0	'
Commercial Leases Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Total Loans	0	0
Consumer Installment Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	11,722,000
Days Past Due 60 to 89	'	3,193,000
Days Past Due more than 90	'	5,639,000
Total Past Due	'	20,554,000
Current	'	1,307,704,000
Total Loans	'	1,328,258,000
More than 90 days Past Due and Accruing	'	4,942,000
Nonaccrual Loans	'	2,914,000
Consumer Installment Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	15,433,000	'
Days Past Due 60 to 89	4,050,000	'
Days Past Due more than 90	4,462,000	'
Total Past Due	23,945,000	'
Current	1,703,980,000	'
Total Loans	1,727,925,000	'
More than 90 days Past Due and Accruing	3,735,000	'
Nonaccrual Loans	3,681,000	'
Consumer Installment Financing Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	14,528,000	'
Days Past Due 60 to 89	4,076,000	'
Days Past Due more than 90	3,354,000	'
Total Past Due	21,958,000	'
Current	982,611,000	'
Total Loans	1,004,569,000	'
More than 90 days Past Due and Accruing	2,263,000	'
Nonaccrual Loans	679,000	'
Consumer Installment Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	33,000	1,000
Days Past Due 60 to 89	0	65,000
Days Past Due more than 90	0	21,000
Total Past Due	33,000	87,000
Current	6,130,000	8,102,000
Total Loans	6,163,000	8,189,000
Consumer Home Equity Lines Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	1,584,000
Days Past Due 60 to 89	'	880,000
Days Past Due more than 90	'	1,227,000
Total Past Due	'	3,691,000
Current	'	802,387,000
Total Loans	'	806,078,000
More than 90 days Past Due and Accruing	'	475,000
Nonaccrual Loans	'	1,557,000
Consumer Home Equity Lines Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	1,864,000	'
Days Past Due 60 to 89	918,000	'
Days Past Due more than 90	965,000	'
Total Past Due	3,747,000	'
Current	916,319,000	'
Total Loans	920,066,000	'
More than 90 days Past Due and Accruing	418,000	'
Nonaccrual Loans	1,819,000	'
Consumer Home Equity Lines Financing Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	4,774,000	'
Days Past Due 60 to 89	1,933,000	'
Days Past Due more than 90	3,606,000	'
Total Past Due	10,313,000	'
Current	284,111,000	'
Total Loans	294,424,000	'
More than 90 days Past Due and Accruing	1,039,000	'
Nonaccrual Loans	1,300,000	'
Consumer Home Equity Lines Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	544,000	1,528,000
Days Past Due 60 to 89	1,467,000	654,000
Days Past Due more than 90	1,651,000	2,211,000
Total Past Due	3,662,000	4,393,000
Current	93,780,000	112,832,000
Total Loans	97,442,000	117,225,000
Consumer Credit Card Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	969,000
Days Past Due 60 to 89	'	558,000
Days Past Due more than 90	'	954,000
Total Past Due	'	2,481,000
Current	'	143,906,000
Total Loans	'	146,387,000
More than 90 days Past Due and Accruing	'	438,000
Nonaccrual Loans	'	598,000
Consumer Credit Card Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	729,000	'
Days Past Due 60 to 89	471,000	'
Days Past Due more than 90	735,000	'
Total Past Due	1,935,000	'
Current	146,378,000	'
Total Loans	148,313,000	'
More than 90 days Past Due and Accruing	404,000	'
Nonaccrual Loans	558,000	'
Consumer Residential Mortgages Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	'	13,291,000
Days Past Due 60 to 89	'	2,488,000
Days Past Due more than 90	'	5,231,000
Total Past Due	'	21,010,000
Current	'	424,201,000
Total Loans	'	445,211,000
More than 90 days Past Due and Accruing	'	3,076,000
Nonaccrual Loans	'	9,852,000
Consumer Residential Mortgages Financing Receivable | Originated Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	19,858,000	'
Days Past Due 60 to 89	2,072,000	'
Days Past Due more than 90	9,350,000	'
Total Past Due	31,280,000	'
Current	497,973,000	'
Total Loans	529,253,000	'
More than 90 days Past Due and Accruing	6,008,000	'
Nonaccrual Loans	10,471,000	'
Consumer Residential Mortgages Financing Receivable | Acquired Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	3,918,000	'
Days Past Due 60 to 89	1,426,000	'
Days Past Due more than 90	8,063,000	'
Total Past Due	13,407,000	'
Current	457,245,000	'
Total Loans	470,652,000	'
More than 90 days Past Due and Accruing	403,000	'
Nonaccrual Loans	582,000	'
Consumer Residential Mortgages Financing Receivable | Covered Loans	'	'
Summary of loans by portfolio type	'	'
Days Past Due 30 to 59	7,463,000	10,005,000
Days Past Due 60 to 89	1,565,000	442,000
Days Past Due more than 90	5,165,000	7,763,000
Total Past Due	14,193,000	18,210,000
Current	36,485,000	43,330,000
Total Loans	$50,678,000	$61,540,000

Loans_Financing_Receivables_Cr

Loans (Financing Receivables Credit Quality Indicators Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Consumer Loans Guaranteed by Government	$2,100,000	$3,400,000
Originated Loans	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	36,548,000
Financing Receivable, Net	10,213,387,000	8,731,659,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	13,635,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	28,754,000
Financing Receivable, Recorded Investment, Past Due	'	78,937,000
Financing Receivable, Recorded Investment, Current	'	8,652,722,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	9,417,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	36,687,000
Originated Loans | Commercial and Industrial Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	3,814,000
Financing Receivable, Net	'	3,306,526,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	1,986,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	3,571,000
Financing Receivable, Recorded Investment, Past Due	'	9,371,000
Financing Receivable, Recorded Investment, Current	'	3,297,155,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	104,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	5,255,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	42,211,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	114,480,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	661,692,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	2,408,669,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	44,969,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	34,505,000
Originated Loans | Commercial and Industrial Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Commercial Real Estate Other Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	4,181,000
Financing Receivable, Net	'	2,224,416,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	4,530,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	11,535,000
Financing Receivable, Recorded Investment, Past Due	'	20,246,000
Financing Receivable, Recorded Investment, Current	'	2,204,170,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	382,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	15,780,000
Originated Loans | Commercial Real Estate Other Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Commercial Real Estate Other Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	3,138,000
Originated Loans | Commercial Real Estate Other Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	254,749,000
Originated Loans | Commercial Real Estate Other Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	1,845,686,000
Originated Loans | Commercial Real Estate Other Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	53,675,000
Originated Loans | Commercial Real Estate Other Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	67,168,000
Originated Loans | Commercial Real Estate Other Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Commercial Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	981,000
Financing Receivable, Net	'	335,547,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	597,000
Financing Receivable, Recorded Investment, Past Due	'	1,578,000
Financing Receivable, Recorded Investment, Current	'	333,969,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	0
Financing Receivable, Recorded Investment, Nonaccrual Status	'	731,000
Originated Loans | Commercial Real Estate Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	335,547,000
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	17,652,000
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	311,271,000
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	3,057,000
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	3,567,000
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Commercial Leases Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	6,000
Financing Receivable, Net	'	139,236,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	0
Financing Receivable, Recorded Investment, Past Due	'	6,000
Financing Receivable, Recorded Investment, Current	'	139,230,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	0
Financing Receivable, Recorded Investment, Nonaccrual Status	'	0
Originated Loans | Commercial Leases Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	13,119,000
Originated Loans | Commercial Leases Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	179,000
Originated Loans | Commercial Leases Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	20,042,000
Originated Loans | Commercial Leases Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	104,037,000
Originated Loans | Commercial Leases Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	1,561,000
Originated Loans | Commercial Leases Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	298,000
Originated Loans | Commercial Leases Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	'	0
Originated Loans | Consumer Installment Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	11,722,000
Financing Receivable, Net	'	1,328,258,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	3,193,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	5,639,000
Financing Receivable, Recorded Investment, Past Due	'	20,554,000
Financing Receivable, Recorded Investment, Current	'	1,307,704,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	4,942,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	2,914,000
Originated Loans | Consumer Home Equity Lines Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	1,584,000
Financing Receivable, Net	'	806,078,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	880,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	1,227,000
Financing Receivable, Recorded Investment, Past Due	'	3,691,000
Financing Receivable, Recorded Investment, Current	'	802,387,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	475,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	1,557,000
Originated Loans | Consumer Credit Card Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	969,000
Financing Receivable, Net	'	146,387,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	558,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	954,000
Financing Receivable, Recorded Investment, Past Due	'	2,481,000
Financing Receivable, Recorded Investment, Current	'	143,906,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	438,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	598,000
Originated Loans | Consumer Residential Mortgages Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	'	13,291,000
Financing Receivable, Net	'	445,211,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	'	2,488,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	'	5,231,000
Financing Receivable, Recorded Investment, Past Due	'	21,010,000
Financing Receivable, Recorded Investment, Current	'	424,201,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	'	3,076,000
Financing Receivable, Recorded Investment, Nonaccrual Status	'	9,852,000
Originated Loans	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	52,585,000	'
Financing Receivable, Net	10,213,387,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	10,926,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	35,888,000	'
Financing Receivable, Recorded Investment, Past Due	99,399,000	'
Financing Receivable, Recorded Investment, Current	10,113,988,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	11,176,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	42,203,000	'
Originated Loans | Commercial and Industrial Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	8,941,000	'
Financing Receivable, Net	4,139,567,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	994,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	10,622,000	'
Financing Receivable, Recorded Investment, Past Due	20,557,000	'
Financing Receivable, Recorded Investment, Current	4,119,010,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	151,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	11,323,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	34,909,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	108,709,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	802,624,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	3,133,177,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	30,116,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	30,032,000	'
Originated Loans | Commercial and Industrial Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Originated Loans | Commercial Real Estate Other Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	4,507,000	'
Financing Receivable, Net	2,169,787,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2,400,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	9,688,000	'
Financing Receivable, Recorded Investment, Past Due	16,595,000	'
Financing Receivable, Recorded Investment, Current	2,153,192,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	460,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	14,229,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	241,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	3,730,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	315,150,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	1,759,201,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	46,483,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	44,982,000	'
Originated Loans | Commercial Real Estate Other Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Originated Loans | Commercial Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	351,000	'
Financing Receivable, Net	338,925,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	21,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	66,000	'
Financing Receivable, Recorded Investment, Past Due	438,000	'
Financing Receivable, Recorded Investment, Current	338,487,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	'
Financing Receivable, Recorded Investment, Nonaccrual Status	122,000	'
Originated Loans | Commercial Real Estate Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	338,925,000	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	25,632,000	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	306,795,000	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	267,000	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	6,231,000	'
Originated Loans | Commercial Real Estate Construction Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Originated Loans | Commercial Leases Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	902,000	'
Financing Receivable, Net	239,551,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	'
Financing Receivable, Recorded Investment, Past Due	902,000	'
Financing Receivable, Recorded Investment, Current	238,649,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	'
Financing Receivable, Recorded Investment, Nonaccrual Status	0	'
Originated Loans | Commercial Leases Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	9,271,000	'
Originated Loans | Commercial Leases Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	2,900,000	'
Originated Loans | Commercial Leases Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	54,446,000	'
Originated Loans | Commercial Leases Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	167,022,000	'
Originated Loans | Commercial Leases Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	5,750,000	'
Originated Loans | Commercial Leases Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	162,000	'
Originated Loans | Commercial Leases Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Originated Loans | Consumer Installment Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	15,433,000	'
Financing Receivable, Net	1,727,925,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	4,050,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,462,000	'
Financing Receivable, Recorded Investment, Past Due	23,945,000	'
Financing Receivable, Recorded Investment, Current	1,703,980,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3,735,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	3,681,000	'
Originated Loans | Consumer Home Equity Lines Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,864,000	'
Financing Receivable, Net	920,066,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	918,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	965,000	'
Financing Receivable, Recorded Investment, Past Due	3,747,000	'
Financing Receivable, Recorded Investment, Current	916,319,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	418,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	1,819,000	'
Originated Loans | Consumer Credit Card Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	729,000	'
Financing Receivable, Net	148,313,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	471,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	735,000	'
Financing Receivable, Recorded Investment, Past Due	1,935,000	'
Financing Receivable, Recorded Investment, Current	146,378,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	404,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	558,000	'
Originated Loans | Consumer Residential Mortgages Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	19,858,000	'
Financing Receivable, Net	529,253,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2,072,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	9,350,000	'
Financing Receivable, Recorded Investment, Past Due	31,280,000	'
Financing Receivable, Recorded Investment, Current	497,973,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	6,008,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	10,471,000	'
Acquired Loans	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	32,793,000	'
Financing Receivable, Net	3,495,615,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	13,578,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	45,133,000	'
Financing Receivable, Recorded Investment, Past Due	91,504,000	'
Financing Receivable, Recorded Investment, Current	3,404,111,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	4,148,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	4,007,000	'
Acquired Loans | Commercial and Industrial Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,295,000	'
Financing Receivable, Net	794,079,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	862,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,744,000	'
Financing Receivable, Recorded Investment, Past Due	5,901,000	'
Financing Receivable, Recorded Investment, Current	788,178,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	40,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	795,000	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	1,741,000	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	79,634,000	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	643,495,000	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	46,807,000	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	22,402,000	'
Acquired Loans | Commercial and Industrial Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Other Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	5,603,000	'
Financing Receivable, Net	918,645,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	5,281,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	26,366,000	'
Financing Receivable, Recorded Investment, Past Due	37,250,000	'
Financing Receivable, Recorded Investment, Current	881,395,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	403,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	651,000	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	703,000	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	29,224,000	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	722,307,000	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	93,499,000	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	72,912,000	'
Acquired Loans | Commercial Real Estate Other Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,675,000	'
Financing Receivable, Net	13,246,000	'
Financing Receivable, Recorded Investment, Past Due	2,675,000	'
Financing Receivable, Recorded Investment, Current	10,571,000	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	13,246,000	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Real Estate Construction Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Commercial Leases Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	'
Acquired Loans | Consumer Installment Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	14,528,000	'
Financing Receivable, Net	1,004,569,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	4,076,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,354,000	'
Financing Receivable, Recorded Investment, Past Due	21,958,000	'
Financing Receivable, Recorded Investment, Current	982,611,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	2,263,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	679,000	'
Acquired Loans | Consumer Home Equity Lines Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	4,774,000	'
Financing Receivable, Net	294,424,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,933,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,606,000	'
Financing Receivable, Recorded Investment, Past Due	10,313,000	'
Financing Receivable, Recorded Investment, Current	284,111,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,039,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	1,300,000	'
Acquired Loans | Consumer Residential Mortgages Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,918,000	'
Financing Receivable, Net	470,652,000	'
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,426,000	'
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	8,063,000	'
Financing Receivable, Recorded Investment, Past Due	13,407,000	'
Financing Receivable, Recorded Investment, Current	457,245,000	'
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	403,000	'
Financing Receivable, Recorded Investment, Nonaccrual Status	582,000	'
Covered Loans	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	13,922,000	17,184,000
Financing Receivable, Net	530,143,000	905,391,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	9,881,000	25,086,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	143,238,000	240,864,000
Financing Receivable, Recorded Investment, Past Due	167,041,000	283,134,000
Financing Receivable, Recorded Investment, Current	363,102,000	622,257,000
Covered Loans Loss Share Receivable	'	113,700,000
Covered Loans | Commercial and Industrial Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	836,000	931,000
Financing Receivable, Net	76,237,000	128,509,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,489,000	981,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	12,957,000	24,111,000
Financing Receivable, Recorded Investment, Past Due	15,282,000	26,023,000
Financing Receivable, Recorded Investment, Current	60,955,000	102,486,000
Covered Loans | Commercial and Industrial Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial and Industrial Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	968,000	1,526,000
Covered Loans | Commercial and Industrial Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial and Industrial Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	41,115,000	73,480,000
Covered Loans | Commercial and Industrial Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	427,000	3,215,000
Covered Loans | Commercial and Industrial Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	31,621,000	47,468,000
Covered Loans | Commercial and Industrial Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	2,106,000	2,820,000
Covered Loans | Commercial Real Estate Other Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,855,000	4,130,000
Financing Receivable, Net	273,594,000	539,595,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	3,443,000	15,019,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	103,077,000	172,444,000
Financing Receivable, Recorded Investment, Past Due	109,375,000	191,593,000
Financing Receivable, Recorded Investment, Current	164,219,000	348,002,000
Covered Loans | Commercial Real Estate Other Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Real Estate Other Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Real Estate Other Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Real Estate Other Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	113,863,000	214,987,000
Covered Loans | Commercial Real Estate Other Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	6,219,000	30,708,000
Covered Loans | Commercial Real Estate Other Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	153,318,000	292,158,000
Covered Loans | Commercial Real Estate Other Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	194,000	1,742,000
Covered Loans | Commercial Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,191,000	589,000
Financing Receivable, Net	26,029,000	50,333,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,917,000	7,925,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	20,388,000	34,314,000
Financing Receivable, Recorded Investment, Past Due	24,496,000	42,828,000
Financing Receivable, Recorded Investment, Current	1,533,000	7,505,000
Covered Loans | Commercial Real Estate Construction Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	26,029,000	50,333,000
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	601,000	476,000
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	1,331,000
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	23,208,000	45,838,000
Covered Loans | Commercial Real Estate Construction Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	2,220,000	2,688,000
Covered Loans | Commercial Leases Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 1	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 2	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 3	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 4	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 5	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 6	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Commercial Leases Financing Receivable | Grade 7	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Net	0	0
Covered Loans | Consumer Installment Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	33,000	1,000
Financing Receivable, Net	6,163,000	8,189,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	65,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	21,000
Financing Receivable, Recorded Investment, Past Due	33,000	87,000
Financing Receivable, Recorded Investment, Current	6,130,000	8,102,000
Covered Loans | Consumer Home Equity Lines Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	544,000	1,528,000
Financing Receivable, Net	97,442,000	117,225,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,467,000	654,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,651,000	2,211,000
Financing Receivable, Recorded Investment, Past Due	3,662,000	4,393,000
Financing Receivable, Recorded Investment, Current	93,780,000	112,832,000
Covered Loans | Consumer Residential Mortgages Financing Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	7,463,000	10,005,000
Financing Receivable, Net	50,678,000	61,540,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,565,000	442,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	5,165,000	7,763,000
Financing Receivable, Recorded Investment, Past Due	14,193,000	18,210,000
Financing Receivable, Recorded Investment, Current	$36,485,000	$43,330,000

Allowance_for_Loan_and_Lease_L2

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Provision for acquired loan losses	$6,800,000	'	'
Provision for Loan Lease and Other Losses Covered	'	20,722,000	20,353,000
Minimum Non Performing Substandard Loans Outstanding for Allowance for Credit Losses	300,000	'	'
Minimum Non Performing Substandard Doubtful Loans Outstanding for Allowance for Credit Losses	100,000	'	'
Loan Commitments	5,546,635,000	4,151,541,000	'
Total impaired loans with no related allowance	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Loan Commitments	200,000	'	'
Acquired Loans	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses	741,000	'	'
Covered Loans	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	23,892,000	35,450,000	'
Allowance for Loan and Lease Losses, Write-offs	23,120,000	28,612,000	'
Benefit Attributable to FDIC Loss Share Agreements	10,790,000	14,728,000	'
Provision for Loan Lease and Other Losses Covered	$13,102,000	$20,722,000	'

Allowance_for_Loan_and_Lease_L3

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Schedule of Credit Losses Related to Originated Financing Receivables, Current and Non-Current) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Provision for Loan, Lease, and Other Losses	($33,684)	($54,698)	($74,388)
Originated Loans	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-40,173	-65,905	'
Financing Receivable, Allowance for Credit Losses, Recovery	24,681	23,172	'
Provision for Loan, Lease, and Other Losses	13,034	33,976	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	6,146	5,004	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	90,338	93,938	'
Financing Receivable, Allowance for Credit Losses	96,484	98,942	107,699
Financing Receivable, Individually Evaluated for Impairment	87,764	96,371	'
Financing Receivable, Collectively Evaluated for Impairment	10,125,623	8,635,288	'
Financing Receivable, Net	10,213,387	8,731,659	'
Originated Loans | Commercial Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-5,840	-22,639	'
Financing Receivable, Allowance for Credit Losses, Recovery	7,981	4,266	'
Provision for Loan, Lease, and Other Losses	4,631	22,219	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,235	577	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	39,746	35,632	'
Financing Receivable, Allowance for Credit Losses	42,981	36,209	32,363
Financing Receivable, Individually Evaluated for Impairment	8,053	6,187	'
Financing Receivable, Collectively Evaluated for Impairment	4,131,514	3,300,339	'
Financing Receivable, Net	4,139,567	3,306,526	'
Originated Loans | Commercial Real Estate Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,281	-5,312	'
Financing Receivable, Allowance for Credit Losses, Recovery	524	911	'
Provision for Loan, Lease, and Other Losses	-7,104	-7,330	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	229	913	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	12,036	19,213	'
Financing Receivable, Allowance for Credit Losses	12,265	20,126	31,857
Financing Receivable, Individually Evaluated for Impairment	20,616	24,007	'
Financing Receivable, Collectively Evaluated for Impairment	2,149,171	2,200,409	'
Financing Receivable, Net	2,169,787	2,224,416	'
Originated Loans | Commercial Construction Financing Receivable Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-516	-697	'
Financing Receivable, Allowance for Credit Losses, Recovery	507	449	'
Provision for Loan, Lease, and Other Losses	-1,002	-1,104	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	105	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,810	3,716	'
Financing Receivable, Allowance for Credit Losses	2,810	3,821	5,173
Financing Receivable, Individually Evaluated for Impairment	906	3,405	'
Financing Receivable, Collectively Evaluated for Impairment	338,019	332,142	'
Financing Receivable, Net	338,925	335,547	'
Originated Loans | Finance Leases Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,237	-144	'
Financing Receivable, Allowance for Credit Losses, Recovery	100	38	'
Provision for Loan, Lease, and Other Losses	1,579	404	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,081	639	'
Financing Receivable, Allowance for Credit Losses	1,081	639	341
Financing Receivable, Individually Evaluated for Impairment	0	0	'
Financing Receivable, Collectively Evaluated for Impairment	239,551	139,236	'
Financing Receivable, Net	239,551	139,236	'
Originated Loans | Installment Financing Receivable Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-16,683	-18,029	'
Financing Receivable, Allowance for Credit Losses, Recovery	10,519	11,694	'
Provision for Loan, Lease, and Other Losses	6,945	-492	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,014	1,526	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	10,921	9,628	'
Financing Receivable, Allowance for Credit Losses	11,935	11,154	17,981
Financing Receivable, Individually Evaluated for Impairment	27,285	30,870	'
Financing Receivable, Collectively Evaluated for Impairment	1,700,640	1,297,388	'
Financing Receivable, Net	1,727,925	1,328,258	'
Originated Loans | Home Equity Receivable Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-7,172	-8,949	'
Financing Receivable, Allowance for Credit Losses, Recovery	2,979	3,441	'
Provision for Loan, Lease, and Other Losses	3,369	12,466	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	223	34	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	12,677	13,690	'
Financing Receivable, Allowance for Credit Losses	12,900	13,724	6,766
Financing Receivable, Individually Evaluated for Impairment	6,726	6,281	'
Financing Receivable, Collectively Evaluated for Impairment	913,340	799,797	'
Financing Receivable, Net	920,066	806,078	'
Originated Loans | Credit Card Receivables Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-5,541	-6,171	'
Financing Receivable, Allowance for Credit Losses, Recovery	1,841	2,138	'
Provision for Loan, Lease, and Other Losses	4,056	4,048	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	312	127	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,428	7,257	'
Financing Receivable, Allowance for Credit Losses	7,740	7,384	7,369
Financing Receivable, Individually Evaluated for Impairment	1,112	1,612	'
Financing Receivable, Collectively Evaluated for Impairment	147,201	144,775	'
Financing Receivable, Net	148,313	146,387	'
Originated Loans | Residential Portfolio Segment	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,903	-3,964	'
Financing Receivable, Allowance for Credit Losses, Recovery	230	235	'
Provision for Loan, Lease, and Other Losses	560	3,765	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,133	1,722	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,639	4,163	'
Financing Receivable, Allowance for Credit Losses	4,772	5,885	5,849
Financing Receivable, Individually Evaluated for Impairment	23,066	24,009	'
Financing Receivable, Collectively Evaluated for Impairment	506,187	421,202	'
Financing Receivable, Net	$529,253	$445,211	'

Allowance_for_Loan_and_Lease_L4

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Schedule of Credit Losses Related to Acquired Financing Receivables) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Credit Losses Acquired Loans [Abstract]	'	'	'
Provision for Loan, Lease, and Other Losses	$33,684	$54,698	$74,388

Allowance_for_Loan_and_Lease_L5

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Schedule of Credit Losses Related to Covered Financing Receivables, Current) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
			Covered Loans	Covered Loans	Covered Loans
Schedule of Allowance for Loan Losses Related to Covered Financing Receivables, Current [Line Items]	'	'	'	'	'
Loans and Leases Receivable, Allowance, Covered	'	'	$44,027	$43,255	$36,417
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	'	'	23,892	35,450	'
Benefit Attributable to FDIC Loss Share Agreements	'	'	-10,790	-14,728	'
Provision for Loan Lease and Other Losses Covered	20,722	20,353	13,102	20,722	'
Increase in Indemnification Asset	'	'	10,790	14,728	'
Allowance for Loan and Lease Losses, Write-offs	'	'	($23,120)	($28,612)	'

Allowance_for_Loan_and_Lease_L6

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Impaired Financing Receivables) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	$7,559	'
Originated Loans	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	6,146	5,004
Impaired Financing Receivable, Recorded Investment	87,764	96,371
Impaired Financing Receivable, Unpaid Principal Balance	104,244	122,187
Impaired Financing Receivable, Average Recorded Investment	93,702	116,779
Originated Loans | Commercial and Industrial Financing Receivable	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,679	14,473
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,503	3,098
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,551	3,089
Impaired Financing Receivable, Related Allowance	3,235	577
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	7,256	12,533
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,009	4,231
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,428	4,943
Originated Loans | Commercial Real Estate	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	23,709	26,402
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	17,871	19,664
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,744	4,343
Impaired Financing Receivable, Related Allowance	229	913
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18,639	23,911
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,836	3,834
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,870	4,927
Originated Loans | Commercial Real Estate Construction Financing Receivable	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,179	3,306
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	906	2,684
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	721
Impaired Financing Receivable, Related Allowance	0	105
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,035	3,861
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	730
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	721
Originated Loans | Consumer Installment Financing Receivable	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,978	3,947
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,813	2,527
Impaired Financing Receivable, with Related Allowance, Recorded Investment	24,472	28,343
Impaired Financing Receivable, Related Allowance	1,014	1,526
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,338	4,251
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,985	29,583
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	24,558	28,706
Originated Loans | Consumer Home Equity Lines Financing Receivable	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,347	849
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,018	642
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,707	5,639
Impaired Financing Receivable, Related Allowance	223	34
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,079	860
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,874	5,924
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,707	5,639
Originated Loans | Consumer Credit Card Financing Receivable	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	49	467
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	49	467
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,064	1,145
Impaired Financing Receivable, Related Allowance	312	127
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	91	568
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,238	1,311
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,064	1,145
Originated Loans | Consumer Residential Mortgages Financing Receivable	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,778	12,142
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,250	9,578
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,816	14,431
Impaired Financing Receivable, Related Allowance	1,133	1,722
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,258	10,645
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,064	14,537
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,898	14,520
Originated Loans | Total impaired loans with no related allowance	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	49,719	61,586
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	35,410	38,660
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	41,696	56,629
Originated Loans | Total impaired loans with a related allowance	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	52,354	57,711
Impaired Financing Receivable, Related Allowance	6,146	5,004
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	52,006	60,150
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	$54,525	$60,601

Allowance_for_Loan_and_Lease_L7

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Troubled Debt Restructurings on Financing Receivables) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	$133,187	$150,487
financing receivables, modifications, number of contracts at period end	2,624	2,842
Financing Receiables, Modifications, Unpaid Principal Balance	184,293	202,273
Commercial and Industrial Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,559	4,380
financing receivables, modifications, number of contracts at period end	40	27
Financing Receiables, Modifications, Unpaid Principal Balance	9,996	10,042
Commercial Real Estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	57,657	66,577
financing receivables, modifications, number of contracts at period end	77	60
Financing Receiables, Modifications, Unpaid Principal Balance	79,307	78,184
Commercial Real Estate Construction Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,049	11,126
financing receivables, modifications, number of contracts at period end	40	38
Financing Receiables, Modifications, Unpaid Principal Balance	25,726	40,966
Commercial Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	68,265	82,083
financing receivables, modifications, number of contracts at period end	157	125
Financing Receiables, Modifications, Unpaid Principal Balance	115,029	129,192
Consumer Installment Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	27,790	30,870
financing receivables, modifications, number of contracts at period end	1,565	1,769
Financing Receiables, Modifications, Unpaid Principal Balance	29,078	32,653
Home Equity Line of Credit	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	12,371	11,913
financing receivables, modifications, number of contracts at period end	286	261
Financing Receiables, Modifications, Unpaid Principal Balance	12,745	12,154
Consumer Credit Card Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,113	1,612
financing receivables, modifications, number of contracts at period end	307	389
Financing Receiables, Modifications, Unpaid Principal Balance	1,113	1,612
Residential Mortgage	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	23,648	24,009
financing receivables, modifications, number of contracts at period end	309	298
Financing Receiables, Modifications, Unpaid Principal Balance	26,328	26,662
Consumer Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	64,922	68,404
financing receivables, modifications, number of contracts at period end	2,467	2,717
Financing Receiables, Modifications, Unpaid Principal Balance	69,264	73,081
Originated Loans Commercial | Commercial and Industrial Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	4,449	2,617
financing receivables, modifications, number of contracts at period end	35	24
Financing Receiables, Modifications, Unpaid Principal Balance	7,660	8,044
Originated Loans Commercial | Commercial Real Estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	15,932	16,305
financing receivables, modifications, number of contracts at period end	52	40
Financing Receiables, Modifications, Unpaid Principal Balance	20,569	20,701
Originated Loans Commercial | Commercial Real Estate Construction Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	905	2,955
financing receivables, modifications, number of contracts at period end	30	28
Financing Receiables, Modifications, Unpaid Principal Balance	1,179	3,419
Originated Loans Commercial | Commercial Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	21,286	21,877
financing receivables, modifications, number of contracts at period end	117	92
Financing Receiables, Modifications, Unpaid Principal Balance	29,408	32,164
Originated Consumer Loans | Consumer Installment Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	27,285	30,870
financing receivables, modifications, number of contracts at period end	1,553	1,769
Financing Receiables, Modifications, Unpaid Principal Balance	28,536	32,653
Originated Consumer Loans | Home Equity Line of Credit	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	6,725	6,281
financing receivables, modifications, number of contracts at period end	231	226
Financing Receiables, Modifications, Unpaid Principal Balance	7,054	6,488
Originated Consumer Loans | Consumer Credit Card Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,113	1,612
financing receivables, modifications, number of contracts at period end	307	389
Financing Receiables, Modifications, Unpaid Principal Balance	1,113	1,612
Originated Consumer Loans | Residential Mortgage	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	23,067	24,009
financing receivables, modifications, number of contracts at period end	301	298
Financing Receiables, Modifications, Unpaid Principal Balance	25,676	26,662
Originated Consumer Loans | Consumer Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	58,190	62,772
financing receivables, modifications, number of contracts at period end	2,392	2,682
Financing Receiables, Modifications, Unpaid Principal Balance	62,379	67,415
Originated Loans	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	79,476	84,649
financing receivables, modifications, number of contracts at period end	2,509	2,774
Financing Receiables, Modifications, Unpaid Principal Balance	91,787	99,579
Acquired Loans	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,917	'
financing receivables, modifications, number of contracts at period end	29	'
Financing Receiables, Modifications, Unpaid Principal Balance	3,049	'
Acquired Loans | Commercial and Industrial Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	6	'
financing receivables, modifications, number of contracts at period end	1	'
Financing Receiables, Modifications, Unpaid Principal Balance	5	'
Acquired Loans | Commercial Real Estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,730	'
financing receivables, modifications, number of contracts at period end	1	'
Financing Receiables, Modifications, Unpaid Principal Balance	1,730	'
Acquired Loans | Commercial Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,736	'
financing receivables, modifications, number of contracts at period end	2	'
Financing Receiables, Modifications, Unpaid Principal Balance	1,735	'
Acquired Loans | installment [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	505	'
financing receivables, modifications, number of contracts at period end	12	'
Financing Receiables, Modifications, Unpaid Principal Balance	542	'
Acquired Loans | Home Equity Line of Credit	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	245	'
financing receivables, modifications, number of contracts at period end	8	'
Financing Receiables, Modifications, Unpaid Principal Balance	270	'
Acquired Loans | Mortgages [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	431	'
financing receivables, modifications, number of contracts at period end	7	'
Financing Receiables, Modifications, Unpaid Principal Balance	502	'
Acquired Loans | Consumer Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,181	'
financing receivables, modifications, number of contracts at period end	27	'
Financing Receiables, Modifications, Unpaid Principal Balance	1,314	'
Covered Loans Commercial | Commercial and Industrial Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,104	1,763
financing receivables, modifications, number of contracts at period end	4	3
Financing Receiables, Modifications, Unpaid Principal Balance	2,331	1,998
Covered Loans Commercial | Commercial Real Estate	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	39,995	50,272
financing receivables, modifications, number of contracts at period end	24	20
Financing Receiables, Modifications, Unpaid Principal Balance	57,008	57,483
Covered Loans Commercial | Commercial Real Estate Construction Financing Receivable	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	4,144	8,171
financing receivables, modifications, number of contracts at period end	10	10
Financing Receiables, Modifications, Unpaid Principal Balance	24,547	37,547
Covered Loans Commercial | Commercial Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	45,243	60,206
financing receivables, modifications, number of contracts at period end	38	33
Financing Receiables, Modifications, Unpaid Principal Balance	83,886	97,028
Covered Loans Commercial | Consumer Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,551	'
financing receivables, modifications, number of contracts at period end	48	'
Financing Receiables, Modifications, Unpaid Principal Balance	5,571	'
Covered Consumer Loans	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	50,794	'
Covered Consumer Loans | Home Equity Line of Credit	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,401	5,632
financing receivables, modifications, number of contracts at period end	47	35
Financing Receiables, Modifications, Unpaid Principal Balance	5,421	5,666
Covered Consumer Loans | Residential Mortgage	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	150	'
financing receivables, modifications, number of contracts at period end	1	'
Financing Receiables, Modifications, Unpaid Principal Balance	150	'
Covered TDR Loans	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	50,794	65,838
financing receivables, modifications, number of contracts at period end	86	68
Financing Receiables, Modifications, Unpaid Principal Balance	89,457	102,694
Covered TDR Loans | Consumer Loan	'	'
Financing Receivable, Modifications [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	$5,632

Allowance_for_Loan_and_Lease_L8

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Accruing and Non-Accruing Troubled Debt Restructurings) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	$133,187	$150,487
Impaired Financing Receivable, Related Allowance	7,559	'
Originated Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	79,476	84,649
Financing Receivable, Recorded Investment, Past Due	'	78,937
Financing Receivable, Recorded Investment, Current	'	8,652,722
Impaired Financing Receivable, Related Allowance	2,996	'
Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,917	'
Impaired Financing Receivable, Related Allowance	741	'
Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	50,794	'
Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	50,794	65,838
Noncovered Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	84,649
Commercial and Industrial Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,559	4,380
Impaired Financing Receivable, Related Allowance	665	'
Commercial and Industrial Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	4,449	2,617
Impaired Financing Receivable, Related Allowance	665	'
Commercial and Industrial Financing Receivable | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	6	'
Impaired Financing Receivable, Related Allowance	0	'
Commercial and Industrial Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,104	1,763
Impaired Financing Receivable, Related Allowance	0	'
Commercial Real Estate	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	57,657	66,577
Impaired Financing Receivable, Related Allowance	3,054	'
Commercial Real Estate | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	15,932	16,305
Impaired Financing Receivable, Related Allowance	32	'
Commercial Real Estate | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,730	'
Impaired Financing Receivable, Related Allowance	0	'
Commercial Real Estate | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	39,995	50,272
Impaired Financing Receivable, Related Allowance	3,022	'
Commercial Real Estate Construction Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,049	11,126
Impaired Financing Receivable, Related Allowance	800	'
Commercial Real Estate Construction Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	905	2,955
Impaired Financing Receivable, Related Allowance	0	'
Commercial Real Estate Construction Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	4,144	8,171
Impaired Financing Receivable, Related Allowance	800	'
Commercial Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	68,265	82,083
Impaired Financing Receivable, Related Allowance	4,519	'
Commercial Loan | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	21,286	21,877
Impaired Financing Receivable, Related Allowance	697	'
Commercial Loan | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,736	'
Impaired Financing Receivable, Related Allowance	0	'
Commercial Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	45,243	60,206
Impaired Financing Receivable, Related Allowance	3,822	'
installment [Member] | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	505	'
Impaired Financing Receivable, Related Allowance	50	'
Consumer Installment	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	27,790	30,870
Impaired Financing Receivable, Related Allowance	590	'
Consumer Installment | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	27,285	30,870
Impaired Financing Receivable, Related Allowance	540	'
Consumer Home Equity Lines Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	12,371	11,913
Impaired Financing Receivable, Related Allowance	581	'
Consumer Home Equity Lines Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	6,725	6,281
Impaired Financing Receivable, Related Allowance	197	'
Consumer Home Equity Lines Financing Receivable | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	245	'
Impaired Financing Receivable, Related Allowance	384	'
Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,401	5,632
Impaired Financing Receivable, Related Allowance	0	'
Mortgages [Member] | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	431	'
Impaired Financing Receivable, Related Allowance	307	'
Residential Mortgage	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	23,648	24,009
Residential Mortgage | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	23,067	24,009
Residential Mortgage | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	150	'
Impaired Financing Receivable, Related Allowance	0	'
Consumer Credit Card Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,113	1,612
Impaired Financing Receivable, Related Allowance	254	'
Consumer Credit Card Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,113	1,612
Impaired Financing Receivable, Related Allowance	254	'
Consumer Residential Mortgages Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	23,648	24,009
Impaired Financing Receivable, Related Allowance	1,615	'
Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	23,067	24,009
Impaired Financing Receivable, Related Allowance	1,308	'
Consumer Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	64,922	68,404
Impaired Financing Receivable, Related Allowance	3,040	'
Consumer Loan | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	58,190	62,772
Impaired Financing Receivable, Related Allowance	2,299	'
Consumer Loan | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,181	'
Impaired Financing Receivable, Related Allowance	741	'
Consumer Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,551	'
Impaired Financing Receivable, Related Allowance	0	'
Consumer Loan | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	5,632
Accruing TDRs	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	114,247	135,453
Financing Receivable, Recorded Investment, Past Due	45,170	57,823
Financing Receivable, Recorded Investment, Current	69,077	77,630
Accruing TDRs | Originated Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	60,791	'
Financing Receivable, Recorded Investment, Past Due	6,086	'
Financing Receivable, Recorded Investment, Current	54,705	'
Accruing TDRs | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,662	'
Financing Receivable, Recorded Investment, Past Due	136	'
Financing Receivable, Recorded Investment, Current	2,526	'
Accruing TDRs | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	50,794	'
Financing Receivable, Recorded Investment, Past Due	38,948	'
Financing Receivable, Recorded Investment, Current	11,846	'
Accruing TDRs | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	65,838
Financing Receivable, Recorded Investment, Past Due	'	49,752
Financing Receivable, Recorded Investment, Current	'	16,086
Accruing TDRs | Noncovered Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	69,615
Financing Receivable, Recorded Investment, Past Due	'	8,071
Financing Receivable, Recorded Investment, Current	'	61,544
Accruing TDRs | Commercial and Industrial Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	3,421	3,471
Financing Receivable, Recorded Investment, Past Due	1,621	2,332
Financing Receivable, Recorded Investment, Current	1,800	1,139
Accruing TDRs | Commercial and Industrial Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,317	1,708
Financing Receivable, Recorded Investment, Past Due	879	1,004
Financing Receivable, Recorded Investment, Current	1,438	704
Accruing TDRs | Commercial and Industrial Financing Receivable | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	0	'
Accruing TDRs | Commercial and Industrial Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,104	1,763
Financing Receivable, Recorded Investment, Past Due	742	1,328
Financing Receivable, Recorded Investment, Current	362	435
Accruing TDRs | Commercial Real Estate	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	52,549	63,784
Financing Receivable, Recorded Investment, Past Due	35,118	43,407
Financing Receivable, Recorded Investment, Current	17,431	20,377
Accruing TDRs | Commercial Real Estate | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	10,824	13,512
Financing Receivable, Recorded Investment, Past Due	382	793
Financing Receivable, Recorded Investment, Current	10,442	12,719
Accruing TDRs | Commercial Real Estate | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,730	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	1,730	'
Accruing TDRs | Commercial Real Estate | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	39,995	50,272
Financing Receivable, Recorded Investment, Past Due	34,736	42,614
Financing Receivable, Recorded Investment, Current	5,259	7,658
Accruing TDRs | Commercial Real Estate Construction Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	4,992	10,991
Financing Receivable, Recorded Investment, Past Due	3,446	6,770
Financing Receivable, Recorded Investment, Current	1,546	4,221
Accruing TDRs | Commercial Real Estate Construction Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	848	2,820
Financing Receivable, Recorded Investment, Past Due	0	960
Financing Receivable, Recorded Investment, Current	848	1,860
Accruing TDRs | Commercial Real Estate Construction Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	4,144	8,171
Financing Receivable, Recorded Investment, Past Due	3,446	5,810
Financing Receivable, Recorded Investment, Current	698	2,361
Accruing TDRs | Commercial Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	60,962	78,246
Financing Receivable, Recorded Investment, Past Due	40,185	52,509
Financing Receivable, Recorded Investment, Current	20,777	25,737
Accruing TDRs | Commercial Loan | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	13,989	18,040
Financing Receivable, Recorded Investment, Past Due	1,261	2,757
Financing Receivable, Recorded Investment, Current	12,728	15,283
Accruing TDRs | Commercial Loan | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,730	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	1,730	'
Accruing TDRs | Commercial Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	45,243	60,206
Financing Receivable, Recorded Investment, Past Due	38,924	49,752
Financing Receivable, Recorded Investment, Current	6,319	10,454
Accruing TDRs | installment [Member] | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	505	'
Financing Receivable, Recorded Investment, Past Due	136	'
Financing Receivable, Recorded Investment, Current	369	'
Accruing TDRs | Consumer Installment	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	25,085	28,632
Financing Receivable, Recorded Investment, Past Due	1,374	1,547
Financing Receivable, Recorded Investment, Current	23,711	27,085
Accruing TDRs | Consumer Installment | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	24,580	28,632
Financing Receivable, Recorded Investment, Past Due	1,238	1,547
Financing Receivable, Recorded Investment, Current	23,342	27,085
Accruing TDRs | Consumer Home Equity Lines Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	11,090	11,051
Financing Receivable, Recorded Investment, Past Due	218	236
Financing Receivable, Recorded Investment, Current	10,872	10,815
Accruing TDRs | Consumer Home Equity Lines Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,507	5,419
Financing Receivable, Recorded Investment, Past Due	194	236
Financing Receivable, Recorded Investment, Current	5,313	5,183
Accruing TDRs | Consumer Home Equity Lines Financing Receivable | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	182	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	182	'
Accruing TDRs | Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,401	5,632
Financing Receivable, Recorded Investment, Past Due	24	0
Financing Receivable, Recorded Investment, Current	5,377	5,632
Accruing TDRs | Mortgages [Member] | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	245	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	245	'
Accruing TDRs | Residential Mortgage | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	150	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	150	'
Accruing TDRs | Consumer Credit Card Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,112	1,601
Financing Receivable, Recorded Investment, Past Due	66	118
Financing Receivable, Recorded Investment, Current	1,046	1,483
Accruing TDRs | Consumer Credit Card Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,112	1,601
Financing Receivable, Recorded Investment, Past Due	66	118
Financing Receivable, Recorded Investment, Current	1,046	1,483
Accruing TDRs | Consumer Residential Mortgages Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	15,998	15,923
Financing Receivable, Recorded Investment, Past Due	3,327	3,413
Financing Receivable, Recorded Investment, Current	12,671	12,510
Accruing TDRs | Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	15,603	15,923
Financing Receivable, Recorded Investment, Past Due	3,327	3,413
Financing Receivable, Recorded Investment, Current	12,276	12,510
Accruing TDRs | Consumer Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	53,285	57,207
Financing Receivable, Recorded Investment, Past Due	4,985	5,314
Financing Receivable, Recorded Investment, Current	48,300	51,893
Accruing TDRs | Consumer Loan | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	46,802	51,575
Financing Receivable, Recorded Investment, Past Due	4,825	5,314
Financing Receivable, Recorded Investment, Current	41,977	46,261
Accruing TDRs | Consumer Loan | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	932	'
Financing Receivable, Recorded Investment, Past Due	136	'
Financing Receivable, Recorded Investment, Current	796	'
Accruing TDRs | Consumer Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,551	'
Financing Receivable, Recorded Investment, Past Due	24	'
Financing Receivable, Recorded Investment, Current	5,527	'
Accruing TDRs | Consumer Loan | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	5,632
Financing Receivable, Recorded Investment, Past Due	'	0
Financing Receivable, Recorded Investment, Current	'	5,632
Nonaccruing TDRs	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	18,940	15,034
Financing Receivable, Recorded Investment, Past Due	9,405	5,698
Financing Receivable, Recorded Investment, Current	9,535	9,336
Nonaccruing TDRs | Originated Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	18,685	'
Financing Receivable, Recorded Investment, Past Due	9,251	'
Financing Receivable, Recorded Investment, Current	9,434	'
Nonaccruing TDRs | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	255	'
Financing Receivable, Recorded Investment, Past Due	154	'
Financing Receivable, Recorded Investment, Current	101	'
Nonaccruing TDRs | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	0	'
Nonaccruing TDRs | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	0
Financing Receivable, Recorded Investment, Past Due	'	0
Financing Receivable, Recorded Investment, Current	'	0
Nonaccruing TDRs | Noncovered Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	15,034
Financing Receivable, Recorded Investment, Past Due	'	5,698
Financing Receivable, Recorded Investment, Current	'	9,336
Nonaccruing TDRs | Commercial and Industrial Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,138	909
Financing Receivable, Recorded Investment, Past Due	1,955	65
Financing Receivable, Recorded Investment, Current	183	844
Nonaccruing TDRs | Commercial and Industrial Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,132	909
Financing Receivable, Recorded Investment, Past Due	1,955	65
Financing Receivable, Recorded Investment, Current	177	844
Nonaccruing TDRs | Commercial and Industrial Financing Receivable | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	6	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	6	'
Nonaccruing TDRs | Commercial and Industrial Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | Commercial Real Estate	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,108	2,793
Financing Receivable, Recorded Investment, Past Due	3,900	2,332
Financing Receivable, Recorded Investment, Current	1,208	461
Nonaccruing TDRs | Commercial Real Estate | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	5,108	2,793
Financing Receivable, Recorded Investment, Past Due	3,900	2,332
Financing Receivable, Recorded Investment, Current	1,208	461
Nonaccruing TDRs | Commercial Real Estate | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	0	'
Nonaccruing TDRs | Commercial Real Estate | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | Commercial Real Estate Construction Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	57	135
Financing Receivable, Recorded Investment, Past Due	57	0
Financing Receivable, Recorded Investment, Current	0	135
Nonaccruing TDRs | Commercial Real Estate Construction Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	57	135
Financing Receivable, Recorded Investment, Past Due	57	0
Financing Receivable, Recorded Investment, Current	0	135
Nonaccruing TDRs | Commercial Real Estate Construction Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | Commercial Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	7,303	3,837
Financing Receivable, Recorded Investment, Past Due	5,912	2,397
Financing Receivable, Recorded Investment, Current	1,391	1,440
Nonaccruing TDRs | Commercial Loan | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	7,297	3,837
Financing Receivable, Recorded Investment, Past Due	5,912	2,397
Financing Receivable, Recorded Investment, Current	1,385	1,440
Nonaccruing TDRs | Commercial Loan | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	6	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	6	'
Nonaccruing TDRs | Commercial Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | installment [Member] | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	0	'
Nonaccruing TDRs | Consumer Installment	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,705	2,238
Financing Receivable, Recorded Investment, Past Due	222	174
Financing Receivable, Recorded Investment, Current	2,483	2,064
Nonaccruing TDRs | Consumer Installment | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	2,705	2,238
Financing Receivable, Recorded Investment, Past Due	222	174
Financing Receivable, Recorded Investment, Current	2,483	2,064
Nonaccruing TDRs | Consumer Home Equity Lines Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,281	862
Financing Receivable, Recorded Investment, Past Due	12	226
Financing Receivable, Recorded Investment, Current	1,269	636
Nonaccruing TDRs | Consumer Home Equity Lines Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1,218	862
Financing Receivable, Recorded Investment, Past Due	12	226
Financing Receivable, Recorded Investment, Current	1,206	636
Nonaccruing TDRs | Consumer Home Equity Lines Financing Receivable | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	63	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	63	'
Nonaccruing TDRs | Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | Mortgages [Member] | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	186	'
Financing Receivable, Recorded Investment, Past Due	154	'
Financing Receivable, Recorded Investment, Current	32	'
Nonaccruing TDRs | Residential Mortgage | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	0	'
Nonaccruing TDRs | Consumer Credit Card Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1	11
Financing Receivable, Recorded Investment, Past Due	1	11
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | Consumer Credit Card Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	1	11
Financing Receivable, Recorded Investment, Past Due	1	11
Financing Receivable, Recorded Investment, Current	0	0
Nonaccruing TDRs | Consumer Residential Mortgages Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	7,650	8,086
Financing Receivable, Recorded Investment, Past Due	3,258	2,890
Financing Receivable, Recorded Investment, Current	4,392	5,196
Nonaccruing TDRs | Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	7,464	8,086
Financing Receivable, Recorded Investment, Past Due	3,104	2,890
Financing Receivable, Recorded Investment, Current	4,360	5,196
Nonaccruing TDRs | Consumer Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	11,637	11,197
Financing Receivable, Recorded Investment, Past Due	3,493	3,301
Financing Receivable, Recorded Investment, Current	8,144	7,896
Nonaccruing TDRs | Consumer Loan | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	11,388	11,197
Financing Receivable, Recorded Investment, Past Due	3,339	3,301
Financing Receivable, Recorded Investment, Current	8,049	7,896
Nonaccruing TDRs | Consumer Loan | Acquired Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	249	'
Financing Receivable, Recorded Investment, Past Due	154	'
Financing Receivable, Recorded Investment, Current	95	'
Nonaccruing TDRs | Consumer Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	0	'
Financing Receivable, Recorded Investment, Past Due	0	'
Financing Receivable, Recorded Investment, Current	0	'
Nonaccruing TDRs | Consumer Loan | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Financing Receivable, Modifications, Recorded Investment	'	0
Financing Receivable, Recorded Investment, Past Due	'	0
Financing Receivable, Recorded Investment, Current	'	0
Total Tdr Allowance	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	11,297
Total Tdr Allowance | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	3,822	'
Total Tdr Allowance | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	6,697
Total Tdr Allowance | Noncovered Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	4,600
Total Tdr Allowance | Commercial and Industrial Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	735
Total Tdr Allowance | Commercial and Industrial Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	217
Total Tdr Allowance | Commercial and Industrial Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	518
Total Tdr Allowance | Commercial Real Estate	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	5,828
Total Tdr Allowance | Commercial Real Estate | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	869
Total Tdr Allowance | Commercial Real Estate | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	4,959
Total Tdr Allowance | Commercial Real Estate Construction Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,325
Total Tdr Allowance | Commercial Real Estate Construction Financing Receivable | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	105
Total Tdr Allowance | Commercial Real Estate Construction Financing Receivable | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,220
Total Tdr Allowance | Commercial Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	7,888
Total Tdr Allowance | Commercial Loan | Originated Loans Commercial	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,191
Total Tdr Allowance | Commercial Loan | Covered Commercial TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	6,697
Total Tdr Allowance | Consumer Installment	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,526
Total Tdr Allowance | Consumer Installment | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,526
Total Tdr Allowance | Consumer Home Equity Lines Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	34
Total Tdr Allowance | Consumer Home Equity Lines Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	34
Total Tdr Allowance | Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	0
Total Tdr Allowance | Consumer Credit Card Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	127
Total Tdr Allowance | Consumer Credit Card Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	127
Total Tdr Allowance | Consumer Residential Mortgages Financing Receivable	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,722
Total Tdr Allowance | Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	1,722
Total Tdr Allowance | Consumer Loan	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	3,409
Total Tdr Allowance | Consumer Loan | Originated Consumer Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	3,409
Total Tdr Allowance | Consumer Loan | Covered TDR Loans	'	'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'	'
Impaired Financing Receivable, Related Allowance	'	$0

Allowance_for_Loan_and_Lease_L9

Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses (Schedule of Debtor Troubled Debt Restructuring, Current Period) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	$5,640	$3,393
financing receivable, modifications, subsequent default, number of contracts at period end	64	54
Commercial and Industrial Financing Receivable	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	1,773	1,603
financing receivable, modifications, subsequent default, number of contracts at period end	4	3
Commercial and Industrial Financing Receivable | Originated Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	1,773	1,603
financing receivable, modifications, subsequent default, number of contracts at period end	4	3
Commercial and Industrial Financing Receivable | Covered Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	0	0
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Commercial Real Estate	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	3,101	500
financing receivable, modifications, subsequent default, number of contracts at period end	7	1
Commercial Real Estate | Originated Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	3,101	500
financing receivable, modifications, subsequent default, number of contracts at period end	6	1
Commercial Real Estate | Covered Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	0	0
financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Commercial Real Estate Construction Financing Receivable	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	276	716
financing receivable, modifications, subsequent default, number of contracts at period end	2	1
Commercial Real Estate Construction Financing Receivable | Originated Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	231	0
financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Commercial Real Estate Construction Financing Receivable | Covered Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	45	716
financing receivable, modifications, subsequent default, number of contracts at period end	1	1
Commercial Loan	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	5,150	2,819
financing receivable, modifications, subsequent default, number of contracts at period end	13	5
Commercial Loan | Originated Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	5,105	2,103
financing receivable, modifications, subsequent default, number of contracts at period end	11	4
Commercial Loan | Covered Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	45	716
financing receivable, modifications, subsequent default, number of contracts at period end	2	1
Consumer Installment	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	170	280
financing receivable, modifications, subsequent default, number of contracts at period end	17	11
Consumer Installment | Originated Consumer Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	170	280
financing receivable, modifications, subsequent default, number of contracts at period end	17	11
Home Equity Line of Credit	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	0	0
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Home Equity Line of Credit | Originated Consumer Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	0	0
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Consumer Credit Card Financing Receivable	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	245	273
financing receivable, modifications, subsequent default, number of contracts at period end	33	37
Consumer Credit Card Financing Receivable | Originated Consumer Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	245	273
financing receivable, modifications, subsequent default, number of contracts at period end	33	37
Residential Mortgage	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	75	21
financing receivable, modifications, subsequent default, number of contracts at period end	1	1
Residential Mortgage | Originated Consumer Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	75	21
financing receivable, modifications, subsequent default, number of contracts at period end	1	1
Consumer Loan	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	490	574
financing receivable, modifications, subsequent default, number of contracts at period end	51	49
Consumer Loan | Originated Consumer Loans	'	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'	'
financing receivables, modifications, subsequent default, recorded investment at period end	$490	$574
financing receivable, modifications, subsequent default, number of contracts at period end	51	49

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details Textual) (USD $)	12 Months Ended				3 Months Ended		12 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013	Apr. 12, 2013	Dec. 31, 2013	Apr. 12, 2013	Dec. 31, 2013	Apr. 12, 2013
				Core Deposits	Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp
							Core Deposits	Core Deposits	Customer Relationships	Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'	'	'	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	'	'	'	'	'	$84,774	'	$70,800	$14,000	$14,000
Finite-Lived Intangible Asset, Useful Life	'	'	'	'10 years	'	'	'15 years	'	'12 years	'
Goodwill	739,819	460,044	460,044	'	'	'	'	'	'	'
Goodwill, Acquired During Period	'	'	'	'	279,775	'	'	'	'	'
Amortization of Intangible Assets	$8,392	$1,866	$2,172	'	'	'	'	'	'	'

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]	'	'	'
Goodwill	$739,819	$460,044	$460,044
Commercial	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	527,406	384,721	384,721
Goodwill, Acquired During Period	142,685	'	'
Retail	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	192,040	66,141	66,141
Goodwill, Acquired During Period	125,899	'	'
Wealth	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	20,373	9,182	9,182
Goodwill, Acquired During Period	11,191	'	'
Citizens Republic Bancorp	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill, Acquired During Period	$279,775	'	'

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Accumulated Amortization of Intangible Asset Schedule) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Apr. 12, 2013

Apr. 12, 2013

Dec. 31, 2013

Apr. 12, 2013

In Thousands, unless otherwise specified

Core Deposits

Core Deposits

Noncompete Agreements

Noncompete Agreements

Lease Agreements

Lease Agreements

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Core Deposits

Customer Relationships

Customer Relationships

Accumulated amortization of intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

Gross Carrying Amount

$102,253

$17,479

$87,533

$16,759

$102

$102

$618

$618

'

'

'

'

Accumulated Amortization

-19,498

-11,106

-16,065

-10,546

-102

-76

-520

-484

'

'

-2,811

'

Net Carrying Amount

82,755

6,373

71,468

6,213

0

26

98

134

'

'

11,189

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles

'

'

'

'

'

'

'

'

$84,774

$70,800

$14,000

$14,000

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets (Schedule of Expected Amortization Expense) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'
31-Dec-14	$11,732
31-Dec-15	10,391
31-Dec-16	9,209
31-Dec-17	8,161
31-Dec-18	7,273
Finite-lived intangible assets future amortization expense, total for next five years	$46,766

Mortgage_Servicing_Rights_and_2

Mortgage Servicing Rights and Mortgage Servicing Activity (Details Textual) (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
					Residential Mortgage	Residential Mortgage	Residential Mortgage
Servicing Assets at Fair Value [Line Items]	'	'	'	'	'	'	'
Principal Amount Outstanding of Loans Held-in-portfolio	$562,300,000	$745,400,000	'	'	'	'	'
Mortgage Servicing rights Valuation Allowance	-282,000	-2,564,000	-3,539,000	0	'	'	'
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale	12,100,000	12,100,000	'	'	'	'	'
Qualitative and Quantitative Information, Transferor's Continuing Involvement, Principal Amount Outstanding, Continued Recognition, Amount	514,600,000	710,600,000	'	'	'	'	'
Servicing Asset	'	'	'	'	2,700,000,000	2,400,000,000	'
Contractually Specified Servicing Fees, Amount	'	'	'	'	$6,400,000	$5,800,000	$5,400,000
Minimum percentage adverse change in prepayment speed	10.00%	'	'	'	'	'	'
Maximum percentage adverse change in prepayment speed	25.00%	'	'	'	'	'	'
Percentage of variation in prepayment speed	10.00%	'	'	'	'	'	'

Mortgage_Servicing_Rights_and_3

Mortgage Servicing Rights and Mortgage Servicing Activity (Changes in the Carrying Amount of Mortgage Servicing Rights) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 12, 2013	Apr. 12, 2013	Dec. 31, 2012	Dec. 31, 2011
				Level 3	Level 3	Level 3	Citizens Republic Bancorp	Mortgage Servicing Rights [Member]	Mortgage Servicing Rights [Member]	Mortgage Servicing Rights [Member]
								Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	'	'	'	'	'	'	$680,020	$994	$0	$0
Mortage Servicing Rights Amortized Value [Roll Forward]	'	'	'	'	'	'	'	'	'	'
Mortgage Servicing Rights Beginning of Period	21,316	21,179	21,317	'	'	'	'	'	'	'
Mortgage Servicing Rights Additions	4,952	5,876	4,442	'	'	'	'	'	'	'
Amortization of Mortgage Servicing Rights (MSRs)	-4,502	-5,739	-4,580	'	'	'	'	'	'	'
Mortgage Servicing Rights, End of Period	22,760	21,316	21,179	'	'	'	'	'	'	'
Mortage Servicing Rights Valuation Rollforward [Roll Forward]	'	'	'	'	'	'	'	'	'	'
Mortgage Servicing rights Valuation Allowance Beginning of Period	-2,564	-3,539	0	'	'	'	'	'	'	'
Mortgage Servicing Rights (MSR) Impairment (Recovery)	2,282	975	-3,539	'	'	'	'	'	'	'
Mortgage Servicing rights Valuation Allowance, End of Period	-282	-2,564	-3,539	'	'	'	'	'	'	'
Mortgage Servicing Rights Net Carrying balance	22,478	18,752	17,640	'	'	'	'	'	'	'
Fair Value of Mortgage Servicing Rights	$23,041	$18,833	'	$23,041	$18,833	$17,749	'	'	'	'

Mortgage_Servicing_Rights_and_4

Mortgage Servicing Rights and Mortgage Servicing Activity Mortgage Servicing Rights and Mortgage Servicing Activity (Changes In Key Economic Assumptions) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]	'
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	9.67%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed	$745
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor Servicing Assets or Liabilities Impact of Twenty Five Percent Adverse Change in Prepayment Speed	1,789
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.85%
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor Servicing Assets or Liabilities Impact of Hundred Basis Point Adverse Change in Discount Rate	719
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor Servicing Assets or Liabilities Impact of Two Hundred Basis Point Adverse Change in Discount Rate	$1,391
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life	'8 years 4 months 29 days

Mortgage_Servicing_Rights_and_5

Mortgage Servicing Rights and Mortgage Servicing Activity (Estimated Amortization Expense for Mortgage Servicing Rights) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Transfers and Servicing [Abstract]	'
2014	$3,588
2015	3,241
2016	2,759
2017	2,339
2018	1,971
more than 5 years	8,580
Future Amortization of Mortgage Servicing Rights (MSRs)	$22,478

Restrictions_on_Cash_and_Divid1

Restrictions on Cash and Dividends Restrictions on Cash and Dividends (Details Narrative) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Restrictions on Cash and Dividends [Abstract]	'	'
Average Balance On Deposit To Satisfy Reserve Requirements	$41.80	$10.20
Cash And Due Deposited With The Federal Reserve Bank	$0.10	'

Premises_and_Equipment_Premise

Premises and Equipment Premises and Equipment (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Premises and Equipment Details Narrative [Abstract]	'	'	'
Depreciation, Depletion and Amortization	$32,153	$23,060	$22,872

Premises_and_Equipment_Schedul

Premises and Equipment (Schedule of Premises and Equipment) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Land

Land

Buildings

Buildings

Equipment

Equipment

Leasehold improvements

Leasehold improvements

Software

Software

Minimum

Minimum

Minimum

Minimum

Maximum

Maximum

Maximum

Maximum

Buildings

Equipment

Leasehold improvements

Software

Buildings

Equipment

Leasehold improvements

Software

Premises and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Premises and Equipment, gross

$639,537

$464,484

$64,810

$46,118

$310,345

$200,578

$156,521

$125,342

$23,872

$20,228

$83,989

$72,218

'

'

'

'

'

'

'

'

Less accumulated depreciation and amortization

312,483

283,335

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Premises and Equipment, net

$327,054

$181,149

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Estimated Useful Lives

'

'

'

'

'

'

'

'

'

'

'

'

'10

'3

'1

'3

'35

'15

'20

'7

Certificates_and_Other_Time_De2

Certificates and Other Time Deposits Certificates and Other Time Deposits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Certificates and Other Deposits [Abstract]	'	'	'
Value of Certificates Disclosed, Equal or Greater Than	$100,000	'	'
Time Deposits, $100,000 or More	882,400,000	489,900,000	'
Interest Expense, Time Deposits, $100,000 or More	$4,500,000	$3,800,000	$6,300,000

Certificates_and_Other_Time_De3

Certificates and Other Time Deposits (Maturities of Certificates and Other Time Deposits) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Time Deposits [Abstract]	'
2014	$1,708,678
2015	483,667
2016	129,216
2017	56,762
2018	73,018
2019 and after	9,329
Certificates of Deposit, at Carrying Value	$2,460,670

Federal_Funds_Purchased_and_Se2

Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Details Narrative) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Feb. 04, 2013	Dec. 31, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013
			Citizens Republic Bancorp	VIE 2	VIE 1	Junior Subordinated Debt	Junior Subordinated Debt	Minimum	Minimum	Maximum	Maximum
						Citizens Republic Bancorp	Citizens Republic Bancorp	Junior Subordinated Debt	Junior Subordinated Debt	Junior Subordinated Debt	Junior Subordinated Debt
								Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp
Borrowed Funds [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Variable Interest Entity-Aggregate Liquidation Amount Outstanding	'	'	'	$25,700,000	$48,700,000	'	'	'	'	'	'
Debt Instrument, Face Amount	'	'	250,000,000	'	'	'	'	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	'	'	4.35%	'	'	'	'	'	'	'	'
Debt Instrument, Description of Variable Rate Basis	'	'	'	'	'	'LIBOR	'LIBOR	'	'	'	'
Debt Instrument, Basis Spread on Variable Rate	'	'	'	'	'	'	'	3.10%	3.10%	11.75%	11.75%
Debt Instrument, Interest Rate, Stated Percentage	'	'	'	'	'	7.50%	7.50%	'	'	'	'
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	2,400,000,000	1,200,000,000	'	'	'	'	'	'	'	'	'
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	$1,000,000,000	$723,000,000	'	'	'	'	'	'	'	'	'
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate, Range from	1.54%	'	'	'	'	'	'	'	'	'	'
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate, Range to	4.12%	'	'	'	'	'	'	'	'	'	'

Federal_Funds_Purchased_and_Se3

Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Schedule of Federal Funds Purchased and Securities Sold Under Agreements to Repurchase and Wholesale Borrowings) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Federal funds purchased and securities sold under agreements to repurchase	$851,535	$1,104,525
Federal Home Loan Bank, Advances, Short-term	525,028	136,883
Subordinated Debt	249,928	'
Federal Home Loan Bank, Advances, Maturities Summary, Due after Year Five	341,187	'
Junior Subordinated Notes	74,500	'
FHLB advances	'	'
Federal Home Loan Bank, Advances, Short-term	200,323	136,546
Federal Home Loan Bank, Advances, Maturities Summary, Due after Year Five	16,759	'
Other Wholesale Borrowings	'	'
Federal Home Loan Bank, Advances, Short-term	277	337
Federal Home Loan Bank, Advances, Maturities Summary, Due after Year Five	$0	'

Federal_Funds_Purchased_and_Se4

Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Schedule of Select Financial Data Federal Funds Purchased and Securities Sold Under Agreements to Repurchase) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	'	'	'
Average Outstanding Amount	$949,068	$949,756	$925,803
Weighted-average annual interest rate during the year	0.13%	0.12%	0.36%
Maximum month-end balance	1,123,795	1,104,525	1,014,720
Wholesale Borrowings	'	'	'
Average Outstanding Amount	474,473	175,989	298,835
Weighted-average annual interest rate during the year	3.62%	2.51%	2.11%
Maximum month-end balance	$527,155	$178,489	$327,997

Federal_Funds_Purchased_and_Se5

Federal Funds Purchased and Securities Sold Under Agreements to Repurchase and Wholesale Borrowings (Schedule of Select Financial Data Wholesale Borrowings) (Details) (Wholesale Borrowings, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Wholesale Borrowings	'	'	'
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]	'	'	'
Average Outstanding Amount	$474,473	$175,989	$298,835
Short-term Debt, Weighted Average Interest Rate	3.62%	2.51%	2.11%
Short-term Debt, Maximum Month-end Outstanding Amount	$527,155	$178,489	$327,997

Federal_Funds_Purchased_and_Se6

Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Schedule of Maturities) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Wholesale Borrowings, Due One Year or Less	$39,946
Wholesale Borrowings, Due One to Three Years	143,608
Wholesale Borrowings, Due Three to Five Years	287
Wholesale Borrowings, Due Over Five Years	341,187
Wholesale Borrowings, Maturities Summary	525,028
Subordinated Debt	249,928
Junior Subordinated Notes	74,500
FHLB advances	'
Wholesale Borrowings, Due One Year or Less	39,883
Wholesale Borrowings, Due One to Three Years	143,470
Wholesale Borrowings, Due Three to Five Years	211
Wholesale Borrowings, Due Over Five Years	16,759
Wholesale Borrowings, Maturities Summary	200,323
Subordinated Debt [Member]	'
Wholesale Borrowings, Due Over Five Years	249,928
Junior Subordinated Debt	'
Wholesale Borrowings, Due Over Five Years	74,500
Other Wholesale Borrowings	'
Wholesale Borrowings, Due One Year or Less	63
Wholesale Borrowings, Due One to Three Years	138
Wholesale Borrowings, Due Three to Five Years	76
Wholesale Borrowings, Due Over Five Years	0
Wholesale Borrowings, Maturities Summary	$277

Income_Taxes_Income_Taxes_Narr

Income Taxes Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax [Line Items]	'	'	'
Operating Loss Carryforwards	$190,350,000	$0	'
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	1,500,000	'	'
Income Tax Expense (Benefit)	76,426,000	53,017,000	46,093,000
Income Tax (Benefits), Probability Threshold For Recognition, Minimum Percentage	50.00%	'	'
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	49	'	'
Unrecognized Tax Benefits, Effective Tax Rate If Fully Recognized	28.90%	'	'
Expiration of Statues of Limitation	'	'	'
Income Tax [Line Items]	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	-300,000	'	'
2013 Tax Filings	'	'	'
Income Tax [Line Items]	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	-500,000	'	'
Net-worth Taxes	'	'	'
Income Tax [Line Items]	'	'	'
Income Tax Expense (Benefit)	9,900,000	7,800,000	5,500,000
Federal [Member]	'	'	'
Income Tax [Line Items]	'	'	'
Operating Loss Carryforwards	543,900,000	'	'
General Business Tax Credit Carryforward [Member]	'	'	'
Income Tax [Line Items]	'	'	'
Operating Loss Carryforwards	5,700,000	'	'
Federal alternative minimum tax credits [Member]	'	'	'
Income Tax [Line Items]	'	'	'
Operating Loss Carryforwards	$41,900,000	'	'

Income_Taxes_Income_Taxes_Sche

Income Taxes Income Taxes (Schedule of Components of Income Tax Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Components of Income Tax Expense [Abstract]	'	'	'
Federal	$20,266	$45,683	$45,026
State	3,496	2,655	1,823
Deferred (benefit) expense	52,664	4,679	-756
Income Tax Expense (Benefit)	$76,426	$53,017	$46,093

Income_Taxes_Income_Taxes_Sche1

Income Taxes Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sechedule of Effective Income Tax Rate Reconciliation [Abstract]	'	'	'
Statutory rate	35.00%	35.00%	35.00%
Increase (decrease) in rate due to:	'	'	'
Effective Income Tax Rate Reconciliation, Tax Exempt Income	-3.16%	-3.23%	-3.04%
effective income tax rate reconciliation merger expenses at acquisition	0.54%	0.00%	0.00%
Effective income tax rate reconciliation, reduction in excess tax reserves	0.11%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance	-2.53%	-3.10%	-3.26%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	0.87%	0.94%	0.72%
Effective Income Tax Rate Reconciliation, Tax Credits	-1.89%	-2.15%	-2.12%
Effective Income Tax Rate Reconciliation, Deductions, Dividends	-0.14%	-0.21%	-0.24%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment	0.27%	0.25%	0.29%
Effective Income Tax Rate Reconciliation, Other Adjustments	0.31%	0.83%	0.48%
Effective tax rates	29.38%	28.33%	27.83%

Income_Taxes_Income_Taxes_Sche2

Income Taxes Income Taxes (Schedule of Deferred Income Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Deferred Income Tax Assets and Liabilities [Abstract]	'	'
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$37,857	$37,341
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	33,615	42,934
Deferred Tax Assets, Real Estate Mortgage Investment Conduit	5,645	6,201
Deferred tax assets, acquired liabilities	13,734	5,041
Deferred tax assets, acquired loans	62,993	0
Deferred tax assets, Available for sale securities	16,819	0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	2,777	0
Deferred Tax Assets, Goodwill	0	2,838
Deferred Tax Assets, Core Deposit Intangible	0	1,275
Operating Loss Carryforwards	190,350	0
Deferred Tax Assets, Gross	416,069	95,630
Deferred Tax Liabilities, Leasing Arrangements	-25,818	-6,962
Deferred tax liabilities, acquired loans	0	-18,765
Deferred Tax Liabilities, Other Comprehensive Income	0	29,841
Deferred Tax Liabilities, Federal Home Loan Bank Stock	-24,401	-25,577
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs	0	-5,709
Deferred Tax Liabilities, Goodwill	-7,129	0
Deferred Tax Liabilities, Intangible Assets	-25,302	0
Deferred Tax Liabilities, Other	-3,510	-1,665
Deferred Tax Liabilities, Net	-86,160	-88,519
Total net deferred tax asset	329,909	7,111
Deferred Tax Assets, Tax Credit Carryforwards	47,597	0
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$4,682	$0

Income_Taxes_Income_Taxes_Chan

Income Taxes Income Taxes (Change in Deferred Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Apr. 12, 2013	Dec. 31, 2012
			Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp
Period Change in Deferred Taxes [Line Items]	'	'	'	'	'
Deferred tax changes reflected in other comprehensive income	($27,224)	$4,137	'	'	'
Deferred Income Tax Expense (Benefit)	52,665	4,679	'	'	'
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Asset, Net	'	'	-348,239	348,200	0
Deferred Tax, Increase (Decrease) During Period	($322,798)	$8,816	'	'	'

Income_Taxes_Income_Taxes_Summ

Income Taxes Income Taxes (Summary of Income Tax Contingencies) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]	'	'	'
Unrecognized Tax Benefits	$1,265	$1,807	$2,437
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	149	695	'
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	'	-72	'
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	-691	-1,253	'
Unrecognized Tax Benefits, Potential Adjustment to Non-Deductible Interest Expense	35	34	'
Unrecognized Tax Benefits, Timing of Accrual For Interest On Nonperforming Assets	'	631	'
Unrecognized Tax Benefits, State Income Tax Exposure	1,230	1,142	'
Federal and State Income Tax	'	'	'
Income Tax Contingency [Line Items]	'	'	'
Unrecognized Tax Benefits	1,003	953	946
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	77	74	'
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	'	-28	'
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	-27	-39	'
Unrecognized Tax Benefits, Potential Adjustment to Non-Deductible Interest Expense	30	30	'
Unrecognized Tax Benefits, Timing of Accrual For Interest On Nonperforming Assets	'	0	'
Unrecognized Tax Benefits, State Income Tax Exposure	973	923	'
Interest and Penalites	'	'	'
Income Tax Contingency [Line Items]	'	'	'
Unrecognized Tax Benefits	262	854	1,491
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	72	621	'
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	'	-44	'
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	-664	-1,214	'
Unrecognized Tax Benefits, Potential Adjustment to Non-Deductible Interest Expense	5	4	'
Unrecognized Tax Benefits, Timing of Accrual For Interest On Nonperforming Assets	'	631	'
Unrecognized Tax Benefits, State Income Tax Exposure	$257	$219	'

Benefit_Plans_Narratives_Detai

Benefit Plans (Narratives) (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Apr. 02, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Postretirement Benefits

Postretirement Benefits

Pension Benefits

Pension Benefits

Retirement Investment Plan

Retirement Investment Plan

Postretirement Benefits

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Pension Benefits

Pension Benefits

FirstMerit

FirstMerit

Savings Plan, 401k

Savings Plan, 401k

Savings Plan, 401k

Savings Plan, 401k

Up to 2% contribution [Member] [Member]

3% to6% contribution [Member] [Member] [Member]

3% to6% contribution [Member] [Member] [Member]

Up to 3% contribution

3% to 5% contribution

Citizens Republic Bancorp

FirstMerit

FirstMerit

FirstMerit

Defined Benefit Plan Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pension Plan Transition Contribution

$1,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employer Contributions

'

'

'

1,270,000

2,195,000

3,695,000

13,205,000

3,500,000

3,200,000

'

'

'

'

10,000,000

'

'

'

1,100,000

4,400,000

600,000

500,000

Postretirement Medical Plans, Description of Change, Limit Employer Medical Contributions, Percent

200.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Postretirement Medical Plans, Description of Change, Age Limit for Subsidized Retiree Coverage

65

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Arrangements, Participating Executive Election to Defer, Percent

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Liability, Classified, Noncurrent

19,200,000

10,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Contributions by Employer, Amount Matched Every One Dollar

'

'

0.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Contributions by Employer, Matching Policy Per Dollar

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Contributions by Employer, Maximum Limit of Employee Salary, Percent

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Expected Future Benefit Payments in Year One

'

'

'

'

'

'

'

'

'

1,600,000

'

'

'

'

28,200,000

'

'

'

'

'

'

Defined Benefit Plan, Expected Future Benefit Payments in Year Two

'

'

'

'

'

'

'

'

'

1,500,000

'

'

'

'

22,900,000

'

'

'

'

'

'

Defined Benefit Plan, Expected Future Benefit Payments in Year Three

'

'

'

'

'

'

'

'

'

1,300,000

'

'

'

'

22,600,000

'

'

'

'

'

'

Defined Benefit Plan, Expected Future Benefit Payments in Year Four

'

'

'

'

'

'

'

'

'

1,300,000

'

'

'

'

20,400,000

'

'

'

'

'

'

Defined Benefit Plan, Expected Future Benefit Payments in Year Five

'

'

'

'

'

'

'

'

'

1,200,000

'

'

'

'

20,500,000

'

'

'

'

'

'

Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter

'

'

'

'

'

'

'

'

'

$5,100,000

'

'

'

'

$92,600,000

'

'

'

'

'

'

Defined Contribution Plan, Employer Matching Contribution, Percent of Match

'

'

'

'

'

'

'

'

'

'

50.00%

'

25.00%

'

'

100.00%

50.00%

'

'

'

'

Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay

'

'

'

'

'

'

'

'

'

'

2.00%

6.00%

'

'

'

3.00%

2.00%

'

'

'

'

Benefit_Plans_Schedule_of_Net_

Benefit Plans (Schedule of Net Benefit Costs) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$34,044	$5,989	($16,786)
Pension Benefits	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	2,339	7,194	6,123
Interest cost	12,814	11,862	11,439
Expected return on assets	-14,938	-12,136	-13,313
Prior service cost	-469	-388	-394
Defined Benefit Plan, Amortization of Gains (Losses), prior to settlement/curtailment income	4,693	10,371	7,120
Curtailment gain	-524	-142	0
Defined Benefit Plan, Net Periodic Benefit Cost	4,852	17,537	11,763
Defined Benefit Plan, Actuarial Gain (Loss)	-47,417	1,281	38,403
Cumulative net loss	-4,169	-10,229	-7,120
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	-52,054	-9,337	30,889
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	-47,203	8,200	42,652
Postretirement Benefits	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Service cost	99	77	54
Interest cost	563	697	886
Expected return on assets	0	0	0
Prior service cost	-468	-468	0
Defined Benefit Plan, Amortization of Gains (Losses), prior to settlement/curtailment income	268	288	114
Curtailment gain	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	462	594	1,054
Defined Benefit Plan, Actuarial Gain (Loss)	-682	-57	-3,217
Cumulative net loss	-268	-288	-114
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	-482	123	-3,330
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	($20)	$717	($2,276)

Benefit_Plans_Schedule_of_Net_1

Benefit Plans (Schedule of Net Funded Status) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Defined Benefit Plan, Accumulated Benefit Obligation	$307,739		$257,206		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'		'		'
Fair value of plan assets, ending balance	257,510		'		'
Pension Benefits	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	68,304		0		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'		'		'
Projected Benefit Obligation, Beginning Balance	259,428		243,640		'
Service cost	2,339		7,194		6,123
Interest cost	12,814		11,862		11,439
Plan amendments	3,927		0		'
Participant contributions	0		0		'
actuarial gains/losses and changes in assumptions	-35,984		8,529		'
Benefits paid	-19,172		-11,797		'
Projected Benefit Obligation, Ending Balance	308,834		259,428		243,640
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'		'		'
Fair value of plan assets, beginning balance	174,385		153,605		'
Actual return on plan assets	30,298		19,372		'
Participant contributions	0		0		'
Employer Contributions	3,695		13,205		'
Benefits paid	-19,172		-11,797		'
Fair value of plan assets, ending balance	257,510		174,385		153,605
Defined Benefit Plan, Funded Status of Plan [Abstract]	'		'		'
Funded Status	51,324	[1]	85,043	[1]	'
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]	'		'		'
Pension and Other Postretirement Defined Benefit Plans, Liabilities	-5,121		-1,663		'
Accumulated other comprehensive income	53,061		108,572		'
Prepaid (accrued) pension/postretirement cost	-58,182		-110,235		'
Postretirement Benefits	'		'		'
Defined Benefit Plan Disclosure [Line Items]	'		'		'
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	0		0		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'		'		'
Projected Benefit Obligation, Beginning Balance	14,771		16,250		'
Service cost	99		77		54
Interest cost	563		697		886
Plan amendments	0		0		'
Participant contributions	1,538		1,199		'
actuarial gains/losses and changes in assumptions	-682		-58		'
Benefits paid	-2,808		-3,394		'
Projected Benefit Obligation, Ending Balance	15,544		14,771		16,250
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'		'		'
Fair value of plan assets, beginning balance	0		0		'
Actual return on plan assets	0		0		'
Participant contributions	1,538		1,199		'
Employer Contributions	1,270		2,195		'
Benefits paid	-2,808		-3,394		'
Fair value of plan assets, ending balance	0		0		0
Defined Benefit Plan, Funded Status of Plan [Abstract]	'		'		'
Funded Status	15,544	[1]	14,771	[1]	'
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]	'		'		'
Pension and Other Postretirement Defined Benefit Plans, Liabilities	-3,858		-4,326		'
Accumulated other comprehensive income	3,329		4,279		'
Prepaid (accrued) pension/postretirement cost	-529		-47		'
Postretirement Benefits | Citizens Republic Bancorp	'		'		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'		'		'
Projected Benefit Obligation, Ending Balance	2,062		0		'
Pension Benefits | Citizens Republic Bancorp	'		'		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'		'		'
Projected Benefit Obligation, Ending Balance	$85,483		$0		'
[1]	The Corporation recognizes the underfunded status of the plans in accrued taxes, expenses and other liabilities on the Consolidated Balance Sheet.

Benefit_Plans_Schedule_of_Assu

Benefit Plans (Schedule of Assumptions Used) (Details)

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Apr. 12, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

Beginning of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

End of year [Member]

Prescription Drugs

Prescription Drugs

Prescription Drugs

Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent

Pension Benefits

Pension Benefits

Pension Benefits

Postretirement Benefits

Postretirement Benefits

Postretirement Benefits

Defined Benefit Postretirement Life Insurance [Member]

Defined Benefit Postretirement Life Insurance [Member]

Defined Benefit Postretirement Life Insurance [Member]

Supplemental Executive Retirement Nonqualified Pension Plan

Supplemental Executive Retirement Nonqualified Pension Plan

Supplemental Executive Retirement Nonqualified Pension Plan

Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent

Citizens Republic Bancorp

Prescription Drugs

Prescription Drugs

Prescription Drugs

Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent

Pension Benefits

Pension Benefits

Pension Benefits

Postretirement Benefits

Postretirement Benefits

Postretirement Benefits

Defined Benefit Postretirement Life Insurance [Member]

Defined Benefit Postretirement Life Insurance [Member]

Defined Benefit Postretirement Life Insurance [Member]

Supplemental Executive Retirement Nonqualified Pension Plan

Supplemental Executive Retirement Nonqualified Pension Plan

Supplemental Executive Retirement Nonqualified Pension Plan

Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent

Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent

Citizens Republic Bancorp

Pension Benefits

Postretirement Benefits

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase

'

'

'

'

'

'

'

5.22%

5.22%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.22%

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate

'

'

'

'

'

'

4.00%

5.00%

6.00%

3.00%

4.00%

4.00%

4.30%

5.00%

6.00%

4.00%

5.04%

6.00%

'

'

'

3.83%

'

'

'

'

'

'

5.00%

4.00%

5.00%

4.00%

3.00%

4.00%

5.00%

4.00%

5.00%

4.00%

4.00%

5.00%

'

'

'

4.00%

Medical trend rates

5.00%

5.00%

5.00%

5.00%

[1]

5.00%

[1]

5.00%

[1]

'

'

'

'

'

'

'

'

'

'

'

'

5.00%

[1]

5.00%

[1]

5.00%

[1]

'

5.00%

5.00%

5.00%

5.00%

[2]

5.00%

[2]

5.00%

[2]

'

'

'

'

'

'

'

'

'

'

'

'

5.00%

[2]

5.00%

[2]

5.00%

[2]

'

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets

'

'

'

'

'

'

7.00%

[3]

7.25%

[3]

8.25%

[3]

'

'

'

'

'

'

'

'

'

'

'

'

6.75%

'

'

'

'

'

'

6.75%

7.00%

7.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.00%

4.00%

4.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.00%

4.00%

4.00%

'

'

'

'

Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year

8.00%

8.50%

9.00%

12.00%

[1]

12.50%

[1]

13.00%

[1]

'

'

'

'

'

'

'

'

'

'

'

'

8.00%

[1]

8.50%

[1]

9.00%

[1]

'

8.00%

8.00%

9.00%

12.00%

[2]

12.00%

[2]

13.00%

[2]

'

'

'

'

'

'

'

'

'

'

'

'

8.00%

[2]

8.00%

[2]

9.00%

[2]

'

Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate

'2019

'2019

'2019

'2027

[1]

'2027

[1]

'2027

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'2019

[1]

'2019

[1]

'2019

[1]

'

'2019

'2019

'2019

'2027

[2]

'2027

[2]

'2027

[2]

'

'

'

'

'

'

'

'

'

'

'

'

'2019

[2]

'2019

[2]

'2019

[2]

'

[1]

The health care cost trend assumptions relate only to the postretirement benefit plans. Increasing or decreasing the assumed health care cost trend rates by one percentage point each future year would not have a material impact on total service and interest cost or the year end benefit obligation

[2]

The health care cost trend assumptions relate only to the postretirement benefit plans. Increasing or decreasing the assumed health care cost trend rates by one percentage point each future year would not have a material impact on total service and interest cost or the year end benefit obligation.

[3]

The Citizens Pension and Postretirement Plans were remeasured at the Acquisition Date based on discount rate of 3.83% and an expected long-term rate of return of 6.75%.

Benefit_Plans_Schedule_of_Amou

Benefit Plans (Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'
Prior service cost	($2,066)
Cumulative net loss	2,230
Pension Benefits	'
Defined Benefit Plan Disclosure [Line Items]	'
Prior service cost	-2,534
Cumulative net loss	1,995
Postretirement Benefits	'
Defined Benefit Plan Disclosure [Line Items]	'
Prior service cost	-468
Cumulative net loss	$235

Benefit_Plans_Benefit_Plans_In

Benefit Plans Benefit Plans (Investment Allocation Strategy) (Details) (Return Seeking Investments)	12 Months Ended
	Dec. 31, 2013
b $80%	'
Minimum	58.00%
Target	65.00%
Maximum	72.00%
81%-83%	'
Minimum	55.00%
Target	62.00%
Maximum	69.00%
84%-86%	'
Minimum	52.00%
Target	58.00%
Maximum	64.00%
87%-89%	'
Minimum	47.00%
Target	53.00%
Maximum	59.00%
90%-92%	'
Minimum	43.00%
Target	49.00%
Maximum	55.00%
93%-95%	'
Minimum	39.00%
Target	44.00%
Maximum	49.00%
96%-98%	'
Minimum	35.00%
Target	40.00%
Maximum	45.00%
99%-101%	'
Minimum	31.00%
Target	35.00%
Maximum	39.00%
102%-104%	'
Minimum	27.00%
Target	31.00%
Maximum	35.00%
105%-107%	'
Minimum	22.00%
Target	26.00%
Maximum	30.00%
107%-110%	'
Minimum	18.00%
Target	22.00%
Maximum	26.00%
110%	'
Minimum	16.00%
Target	20.00%
Maximum	24.00%

Benefit_Plans_Schedule_of_Allo

Benefit Plans (Schedule of Allocation of Plan Assets) (Details)	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	100.00%	100.00%
Cash and domestic money market funds	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	1.92%	2.97%
U.S. Treasury obligations	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	1.76%	2.34%
U.S. Government agencies	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	0.96%	2.03%
Corporate bonds	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	3.12%	4.55%
Common stocks	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	11.24%	15.43%
Equity mutual funds	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	27.62%	31.35%
Fixed income mutual funds	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	36.56%	24.10%
Foreign mutual funds	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Percentage of Plan Assets on Measurement Date	16.83%	17.23%

Benefit_Plans_Schedule_of_Fair

Benefit Plans (Schedule of Fair Value of Plan Assets by Measurement) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	$257,510
Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	242,481
Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	15,029
Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Cash and domestic money market funds	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	4,948
Cash and domestic money market funds | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	4,948
Cash and domestic money market funds | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Cash and domestic money market funds | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
U.S. Treasury obligations	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	4,544
U.S. Treasury obligations | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
U.S. Treasury obligations | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	4,544
U.S. Treasury obligations | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
U.S. Government agencies	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	2,461
U.S. Government agencies | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
U.S. Government agencies | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	2,461
U.S. Government agencies | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Corporate bonds	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	8,024
Corporate bonds | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Corporate bonds | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	8,024
Corporate bonds | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Common stocks	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	28,951
Common stocks | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	28,951
Common stocks | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Common stocks | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Equity mutual funds	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	71,118
Equity mutual funds | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	71,118
Equity mutual funds | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Equity mutual funds | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Fixed income mutual funds	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	94,135
Fixed income mutual funds | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	94,135
Fixed income mutual funds | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Fixed income mutual funds | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Foreign mutual funds	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	43,330
Foreign mutual funds | Level 1	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	43,330
Foreign mutual funds | Level 2	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	0
Foreign mutual funds | Level 3	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Benefit Plan, Fair Value of Plan Assets	$0

ShareBased_Compensation_Narrat

Share-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2006	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Number of Shares Authorized	'	7,883,646	'	'
Share-based Compensation Expense	'	$10,900,000	$9,300,000	$8,000,000
Share-based Compensation Expense, Tax Benefit	'	3,800,000	3,300,000	2,800,000
Share-based Compensation, Share-based Payment Award, Participant Period of Service	'	'15 years	'	'
Share-based Compensation, Share-Based Award, Participant Age, Minimum	'	55	'	'
Award Vesting Period	'	'three	'	'
Award Requisite Service Period	'	'10 years	'	'
Treasury Stock, Shares, Acquired	2,600,000	217,674	198,407	152,818
Total Compensation Cost Not yet Recognized	'	13,300,000	'	'
Total Compensation Cost Not yet Recognized, Period for Recognition	'	'1 year 8 months 20 days	'	'
Restricted Stock Vested in Period, Total Fair Value	'	9,100,000	9,000,000	7,200,000
Stock Options	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Total Compensation Cost Not yet Recognized	'	$0	'	'

ShareBased_Compensation_Stock_

Share-Based Compensation (Stock Option Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation [Abstract]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	'1 year 1 month 21 days	'1 year 9 months 26 days	'1 year 10 months 6 days	'2 years 0 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'	'	'	'
Balance Outstanding (shares) Beginning Balance	1,820	2,077	4,292	'
Outstanding, Weighted-Average Exercise Price (dollars per share) Beginning	$24.73	$25.15	$25.29	'
Exercised (shares)	0	0	0	'
Exercised, Weighted-Average Exercise Price (dollars per share)	$0	$0	$0	'
Forfeited (shares)	-8	-71	0	'
Forfeited, Weighted-Average Exercise Price (dollars per share)	$23.93	$25.85	$0	'
Expired (shares)	-479	-186	-2,215	'
Expired, Weighted-Average Exercise Price (dollars per share)	$36.64	$25.97	$25.55	'
Balance Outstanding (shares) Ending Balance	1,396	1,820	2,077	4,292
Outstanding, Weighted-Average Exercise Price (dollars per share) Ending	$28.84	$24.73	$25.15	$25.29
Outstanding, Weighted-Average Remaining Contractual Term (years)	'1 year 0 months 0 days	'1 year 9 months 26 days	'1 year 10 months 6 days	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$87	$0	$0	$70
Acquired (shares)	63	'	'	'
Weighted average exercise price acquired stock	$218.01	'	'	'
Exercisable (shares)	1,396	'	'	'
Exercisable, Weighted-Average Exercise Price (dollars per share)	$28.84	'	'	'

ShareBased_Compensation_Restri

Share-Based Compensation (Restricted Stock Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]	'	'	'
Nonvested Balance Outstanding (shares) Beginning Balance	1,079	1,026	871
Nonvested, Outstanding, Weighted-Average Grant Date Fair Value (dollars per share) Beginning	$17	$18.26	$20.17
Granted (shares)	823	596	585
Granted, Weighted-Average Grant Date Fair Value (dollars per share)	$16.47	$16.06	$16.48
Vested (shares)	-508	-493	-407
Vested, Weighted-Average Grant Date Fair Value (dollars per share)	$17.90	$18.29	$19.75
Forfeited or expired (shares)	-52	-50	-23
Forfeited or expired, Weighted-Average Grant Date Fair Value (dollars per share)	$16.89	$18.94	$19.21
Nonvested Balance Outstanding (shares) Ending Balance	1,342	1,079	1,026
Nonvested, Outstanding, Weighted-Average Grant Date Fair Value (dollars per share) Ending	$16.34	$17	$18.26

Parent_Company_Schedule_of_Con

Parent Company (Schedule of Condensed Financial Statements-Balance Sheet) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Assets:	'	'	'	'
Cash and due from banks	$571,171	$244,223	'	'
Loans to subsidiaries	24,536	16,578	15,629	15,723
Other assets	1,215,336	631,498	'	'
Total assets	23,909,027	14,913,012	'	'
Long-term debt	324,428	0	'	'
Liabilities and Shareholders' Equity:	'	'	'	'
Accrued and other liabilities	21,206,133	13,267,810	'	'
Shareholders' equity	2,702,894	1,645,202	1,565,953	1,507,715
Total liabilities and shareholders' equity	23,909,027	14,913,012	'	'
Parent	'	'	'	'
Assets:	'	'	'	'
Cash and due from banks	125,032	140,939	'	'
Investment securities	2,253	1,429	'	'
Investment in subsidiaries, at equity in underlying value of their net assets	2,863,473	1,490,718	'	'
Other assets	77,674	13,973	'	'
Total assets	3,068,432	1,647,059	'	'
Long-term debt	324,428	0	'	'
Liabilities and Shareholders' Equity:	'	'	'	'
Accrued and other liabilities	41,110	1,857	'	'
Shareholders' equity	2,702,894	1,645,202	'	'
Total liabilities and shareholders' equity	$3,068,432	$1,647,059	'	'

Parent_Company_Schedule_of_Con1

Parent Company (Schedule of Condensed Financial Statements-Income Statement ) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'
Income before income tax expense	$260,110	$187,123	$165,651
Income tax benefit	-76,426	-53,017	-46,093
Net income	183,684	134,106	119,558
Parent	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Cash dividends from subsidiaries	81,715	155,493	72,500
Other income	483	309	287
Total Income	82,198	155,802	72,787
Interest and other expenses	29,684	10,799	8,005
Income before income tax expense	52,514	145,003	64,782
Income tax benefit	9,341	2,004	1,803
Income before undistributed income of subsidiaries	61,855	147,007	66,585
Equity in undistributed income of subsidiaries	121,829	-12,901	52,973
Net income	$183,684	$134,106	$119,558

Parent_Company_Schedule_of_Con2

Parent Company (Schedule of Condensed Financial Staements-Cash Flows) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:	'	'	'
Net income	$183,684	$134,106	$119,558
Adjustments to reconcile net income to net cash provided by operating activities	'	'	'
NET CASH PROVIDED BY OPERATING ACTIVITIES	173,356	168,101	149,335
Investing activities:	'	'	'
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	777,229	-715,055	-353,317
Financing activities:	'	'	'
Cash dividends - common	-96,222	-69,459	-69,255
NET CASH (USED) PROVIDED BY FINANCING ACTIVITIES	-290,777	427,649	58,188
Increase (decrease) in cash and cash equivalents	659,808	-119,305	-145,794
Cash and cash equivalents at beginning of year	258,014	377,319	523,113
Cash and cash equivalents at end of year	917,822	258,014	377,319
Parent	'	'	'
Operating activities:	'	'	'
Net income	183,684	134,106	119,558
Adjustments to reconcile net income to net cash provided by operating activities	'	'	'
Equity in undistributed income of subsidiaries	-121,829	12,901	-52,973
Increase (Decrease) in Income Taxes Receivable	-30,399	-4,446	-936
(Decrease) increase in Federal income tax payable	27,032	106	13
Increase (Decrease) in Interest Payable, Net	4,618	0	0
Other	924	738	558
NET CASH PROVIDED BY OPERATING ACTIVITIES	64,030	143,405	66,220
Investing activities:	'	'	'
Loans to subsidiaries	-50	0	-18,704
Repayment of loans to subsidiaries	0	0	76,030
Payments for investments in and advances to subsidiaries	-315,069	0	0
Sale of Investments and Advances to Subsidiaries	0	7,827	0
Purchases of investment securities	-215	-44	-45
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	-315,334	7,783	57,281
Financing activities:	'	'	'
Repayment of short-term borrowings	249,927	0	0
Proceeds from issuance of common stock	96,550	0	0
Cash dividends - common	-96,222	-69,459	-69,255
Proceeds from exercise of stock options	-5,337	0	0
Purchase of treasury shares	-9,521	-2,389	-2,295
NET CASH (USED) PROVIDED BY FINANCING ACTIVITIES	235,397	-71,848	-71,550
Increase (decrease) in cash and cash equivalents	-15,907	79,340	51,951
Cash and cash equivalents at beginning of year	140,939	61,599	9,648
Cash and cash equivalents at end of year	$125,032	$140,939	$61,599

Segment_Information_Details

Segment Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATIONS:	'	'	'
Net interest income	$710,785	$471,830	$479,627
Provision for Loan, Lease, and Other Losses	-33,684	-54,698	-74,388
Other income	270,343	223,604	224,757
Other expenses	687,334	453,613	464,345
Net income	183,684	134,106	119,558
AVERAGES :	'	'	'
Assets	23,909,027	14,913,012	'
Segment Reporting Average Assets	21,489,775	14,620,627	14,495,330
Loans	12,948,666	9,357,080	9,155,973
Earnings assets	18,492,995	13,072,691	12,728,724
Deposits	17,301,588	11,553,798	11,412,501
Economic Capital	2,408,865	1,608,108	1,548,353
Nonreportable segments and reconciling items	'	'	'
OPERATIONS:	'	'	'
Net interest income	-13,827	-12,096	-29,913
Provision for Loan, Lease, and Other Losses	-1,153	-12,997	-10,407
Other income	23,442	19,723	31,885
Other expenses	92,327	33,495	40,664
Net income	-39,898	-12,784	-20,029
SegmentReportingInformationAverageAssets1	8,086,540	'	'
AVERAGES :	'	'	'
Assets	'	5,005,316	5,115,153
Loans	62,008	65,876	64,363
Earnings assets	5,393,874	3,646,302	3,506,811
Deposits	152,782	142,308	240,080
Economic Capital	1,477,698	942,381	905,276
Commercial Loan	'	'	'
OPERATIONS:	'	'	'
Net interest income	386,768	258,575	265,196
Provision for Loan, Lease, and Other Losses	-17,072	-32,319	-38,830
Other income	83,933	67,606	57,940
Other expenses	209,936	159,525	148,338
Net income	158,400	87,318	88,379
SegmentReportingInformationAverageAssets1	8,397,357	'	'
AVERAGES :	'	'	'
Assets	'	6,424,226	6,203,526
Loans	8,292,805	6,391,189	6,201,990
Earnings assets	8,480,005	6,493,713	6,281,589
Deposits	5,572,287	3,284,722	3,027,329
Economic Capital	602,561	404,005	368,434
Retail	'	'	'
OPERATIONS:	'	'	'
Net interest income	322,942	207,907	225,580
Provision for Loan, Lease, and Other Losses	-16,151	-10,008	-21,672
Other income	114,679	103,279	103,248
Other expenses	330,875	221,297	235,339
Net income	58,886	51,922	46,681
SegmentReportingInformationAverageAssets1	4,746,277	'	'
AVERAGES :	'	'	'
Assets	'	2,952,280	2,935,699
Loans	4,367,701	2,674,997	2,661,910
Earnings assets	4,392,937	2,707,632	2,712,133
Deposits	10,749,725	7,416,982	7,500,213
Economic Capital	256,362	212,409	223,772
Wealth	'	'	'
OPERATIONS:	'	'	'
Net interest income	14,902	17,444	18,764
Provision for Loan, Lease, and Other Losses	-692	-626	-3,479
Other income	48,289	32,996	31,684
Other expenses	54,196	39,296	40,004
Net income	6,296	7,650	4,527
SegmentReportingInformationAverageAssets1	259,601	'	'
AVERAGES :	'	'	'
Assets	'	238,805	240,952
Loans	226,152	225,018	227,710
Earnings assets	226,179	225,044	228,191
Deposits	826,794	709,786	644,879
Economic Capital	$72,244	$49,313	$50,871

Fair_Value_Measurement_Narrati

Fair Value Measurement (Narrative) (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Mortgage Servicing Rights	$22,760,000	$21,316,000	$21,179,000	$21,317,000
Mortgage Servicing rights Valuation Allowance	-282,000	-2,564,000	-3,539,000	0
Mortgage Servicing Rights Net Carrying balance	22,478,000	18,752,000	17,640,000	'
Mortgage Servicing Rights (MSR) Impairment (Recovery)	-2,282,000	-975,000	3,539,000	'
Impaired Collateral Dependant Loans, Recorded Investment	52,600,000	57,800,000	'	'
Determination Of Specific Allowance For Loan Losses	4,800,000	3,300,000	'	'
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	47,900,000	54,500,000	'	'
Impairment of Other Real Estate Owned	1,400,000	2,200,000	'	'
Impairment of Covered Other Real Esate Owned	1,000,000	1,700,000	'	'
Percent of available for sale securities classified as level 2	89.00%	'	'	'
Percentage of Level 3 investments in available for sale investment portfolio	11.00%	'	'	'
True up liability, discount period	'10 years	'	'	'
True-up Liabitlity Discount Rate	3.69%	2.95%	'	'
True-up Liability Effect of Change in Discount Rate Increase By One Percent	800,000	'	'	'
True-up Liability Effect of Change in Discount Rate Decrease by One Percent	700,000	'	'	'
Number of loans that were 90 days or more past due, or were any on nonaccrual status	0	'	'	'
Time period for non-payment of loans that are placed on non-accrual status	'90 days	'	'	'
Midwest	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Percent of FDIC Intrinsic Loss Estimate	20.00%	'	'	'
Intrinsic Loss Estimate of the FDIC	152,000,000	'	'	'
Percent of Asset Premium Paid	25.00%	'	'	'
Asset Premium Paid	21,000,000	'	'	'
Percent of cumulative shared loss payments under loss sharing agreements	25.00%	'	'	'
Estimated fair value of true up liability	7,100,000	7,600,000	'	'
George Washington	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Percent of cumulative shared loss payments under loss sharing agreements	25.00%	'	'	'
Estimated fair value of true up liability	4,300,000	4,600,000	'	'
Percent of excess threshold paid by the Bank under loss sharing agreements	50.00%	'	'	'
Percent Theshold of Loss Sharing Agreements Paid by Bank	20.00%	'	'	'
Stated Threshold of Loss Sharing Agreements Paid by Bank	34,400,000	'	'	'
Percent of Asset Discount Under Loss Sharing Percent of Asset Discount Under Loss Sharing Agreements	25.00%	'	'	'
Stated amount of Asset Discount Under Loss Sharing Agreements	$12,000,000	'	'	'

Fair_Value_Measurement_Recurri

Fair Value Measurement (Recurring and Nonrecurring Table) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Mortgage Servicing Rights	$22,760,000	$21,316,000	$21,179,000	$21,317,000
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	3,273,174,000	2,920,971,000	'	'
Residential loans held for sale	11,622,000	23,683,000	'	'
Derivative Asset, Fair Value, Gross Asset	47,902,000	63,231,000	'	'
Total Assets, Fair Value Disclosure, Recurring	3,332,698,000	3,007,885,000	'	'
Derivative Liability, Fair Value, Gross Liability	58,201,000	77,968,000	'	'
True Up Liability	11,463,000	12,259,000	'	'
Total liabilities at fair value on a recurring basis	69,664,000	90,227,000	'	'
Nonrecurring Fair Value Measurements [Abstract]	'	'	'	'
Fair Value of Mortgage Servicing Rights	23,041,000	18,833,000	'	'
Impaired and Non Accrual Loans Fair Value Disclosure	47,870,000	54,491,000	'	'
Other Real Estate, Non Covered	10,018,000	7,540,000	'	'
Other Real Estate Covered by Loss Share	8,754,000	12,631,000	'	'
Nonrecurring Fair Value	89,683,000	93,495,000	'	'
Mortgage Servicing rights Valuation Allowance	282,000	2,564,000	3,539,000	0
Mortgage Servicing Rights Net Carrying balance	22,478,000	18,752,000	17,640,000	'
Mortgage Servicing Rights (MSR) Impairment (Recovery)	-2,282,000	-975,000	3,539,000	'
Impaired Collateral Dependant Loans, Recorded Investment	52,600,000	57,800,000	'	'
Determination Of Specific Allowance For Loan Losses	-4,800,000	-3,300,000	'	'
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	47,900,000	54,500,000	'	'
Impairment of Other Real Estate Owned	1,400,000	2,200,000	'	'
Impairment of Covered Other Real Esate Owned	1,000,000	1,700,000	'	'
Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	3,036,000	3,241,000	'	'
Residential loans held for sale	0	0	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Total Assets, Fair Value Disclosure, Recurring	3,036,000	3,241,000	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
True Up Liability	0	0	'	'
Total liabilities at fair value on a recurring basis	0	0	'	'
Nonrecurring Fair Value Measurements [Abstract]	'	'	'	'
Fair Value of Mortgage Servicing Rights	0	0	'	'
Impaired and Non Accrual Loans Fair Value Disclosure	0	0	'	'
Other Real Estate, Non Covered	0	0	'	'
Other Real Estate Covered by Loss Share	0	0	'	'
Nonrecurring Fair Value	0	0	'	'
Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	2,922,527,000	2,868,069,000	'	'
Residential loans held for sale	11,622,000	23,683,000	'	'
Derivative Asset, Fair Value, Gross Asset	47,902,000	63,231,000	'	'
Total Assets, Fair Value Disclosure, Recurring	2,982,051,000	2,954,983,000	'	'
Derivative Liability, Fair Value, Gross Liability	58,201,000	77,968,000	'	'
True Up Liability	0	0	'	'
Total liabilities at fair value on a recurring basis	58,201,000	77,968,000	'	'
Nonrecurring Fair Value Measurements [Abstract]	'	'	'	'
Fair Value of Mortgage Servicing Rights	0	0	'	'
Impaired and Non Accrual Loans Fair Value Disclosure	0	0	'	'
Other Real Estate, Non Covered	0	0	'	'
Other Real Estate Covered by Loss Share	0	0	'	'
Nonrecurring Fair Value	0	0	'	'
Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	347,611,000	49,661,000	'	'
Residential loans held for sale	0	0	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Total Assets, Fair Value Disclosure, Recurring	347,611,000	49,661,000	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
True Up Liability	11,463,000	12,259,000	'	'
Total liabilities at fair value on a recurring basis	11,463,000	12,259,000	'	'
Nonrecurring Fair Value Measurements [Abstract]	'	'	'	'
Fair Value of Mortgage Servicing Rights	23,041,000	18,833,000	17,749,000	'
Impaired and Non Accrual Loans Fair Value Disclosure	47,870,000	54,491,000	'	'
Other Real Estate, Non Covered	10,018,000	7,540,000	'	'
Other Real Estate Covered by Loss Share	8,754,000	12,631,000	'	'
Nonrecurring Fair Value	89,683,000	93,495,000	'	'
Marketable equity securities	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	3,036,000	3,241,000	'	'
Marketable equity securities | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	3,036,000	3,241,000	'	'
Marketable equity securities | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Marketable equity securities | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Non-marketable Equity Securities	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	3,281,000	'	'	'
Non-marketable Equity Securities | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	'	'	'
Non-marketable Equity Securities | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	10,000	'	'	'
Non-marketable Equity Securities | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	3,271,000	'	'	'
U.S. States and political subdivisions	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	262,367,000	268,204,000	'	'
U.S. States and political subdivisions | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
U.S. States and political subdivisions | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	262,367,000	268,204,000	'	'
U.S. States and political subdivisions | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	969,922,000	1,107,063,000	'	'
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	969,922,000	1,107,063,000	'	'
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	69,567,000	52,036,000	'	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	69,567,000	52,036,000	'	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	1,518,393,000	1,329,421,000	'	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	1,518,393,000	1,329,421,000	'	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	9,000	11,000	'	'
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	2,000	'	'
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	9,000	9,000	'	'
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	102,268,000	111,343,000	'	'
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	102,268,000	111,343,000	'	'
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Corporate bonds	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	50,644,000	49,652,000	'	'
Corporate bonds | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Corporate bonds | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	0	'	'
Corporate bonds | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	50,644,000	49,652,000	'	'
Collateralized Loan Obligations	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	293,687,000	'	'	'
Collateralized Loan Obligations | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	'	'	'
Collateralized Loan Obligations | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	0	'	'	'
Collateralized Loan Obligations | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Available-for-sale	293,687,000	'	'	'
Not Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	47,902,000	63,231,000	'	'
Derivative Liability, Fair Value, Gross Liability	46,627,000	58,888,000	'	'
Interest Rate Swap | Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	11,574,000	19,080,000	'	'
Interest Rate Swap | Designated as Hedging Instrument | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Interest Rate Swap | Designated as Hedging Instrument | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Liability, Fair Value, Gross Liability	11,574,000	19,080,000	'	'
Interest Rate Swap | Designated as Hedging Instrument | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Interest Rate Swap | Not Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	46,577,000	58,769,000	'	'
Derivative Liability, Fair Value, Gross Liability	46,577,000	58,769,000	'	'
Interest Rate Swap | Not Designated as Hedging Instrument | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Interest Rate Swap | Not Designated as Hedging Instrument | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	46,577,000	58,769,000	'	'
Derivative Liability, Fair Value, Gross Liability	46,577,000	58,769,000	'	'
Interest Rate Swap | Not Designated as Hedging Instrument | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Mortgage Loan Commitments | Not Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	891,000	4,400,000	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	891,000	4,400,000	'	'
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Forward Contracts | Not Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	384,000	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	62,000	'	'
Forward Contracts | Not Designated as Hedging Instrument | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	'	'	'
Derivative Liability, Fair Value, Gross Liability	'	0	'	'
Forward Contracts | Not Designated as Hedging Instrument | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	384,000	'	'	'
Derivative Liability, Fair Value, Gross Liability	'	62,000	'	'
Forward Contracts | Not Designated as Hedging Instrument | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	'	'	'
Derivative Liability, Fair Value, Gross Liability	'	0	'	'
Foreign Exchange | Not Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	50,000	62,000	'	'
Derivative Liability, Fair Value, Gross Liability	50,000	57,000	'	'
Foreign Exchange | Not Designated as Hedging Instrument | Level 1	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Foreign Exchange | Not Designated as Hedging Instrument | Level 2	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	50,000	62,000	'	'
Derivative Liability, Fair Value, Gross Liability	50,000	57,000	'	'
Foreign Exchange | Not Designated as Hedging Instrument | Level 3	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Other Contract | Not Designated as Hedging Instrument	'	'	'	'
Recurring Fair Value Measurements	'	'	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	$0	$0	'	'

Fair_Value_Measurement_Fair_Va

Fair Value Measurement (Fair Value, Assets Measured on a Recurring Basis, Unobservable Inputs) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Available-for-sale securities, Beginning balance	$49,661	$49,661	$87,539
True-up liability, Beginning balance	12,259	12,259	11,551
Available-for-sale securities, Total unrealized gains/losses	'	0	0
True-up liability, Total unrealized gains/losses	'	-796	708
fair value measurement asssets acquired	3,271	'	'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	'	-2,635	5,282
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	'	0	0
Available-for-sale securities, Purchases	'	297,231	0
True-up liability, Purchases	'	0	0
Available-for-sale securities, Sales	'	0	-40,520
True-up liability, Sales	'	0	0
Available-for-sale securities, Settlements	'	82	-2,640
True-up liability, Settlements	'	0	0
Available-for-sale securities, Transfers	'	0	0
True-up liability, Transfers	'	0	0
Available-for-sale securities, Ending balance	'	347,610	49,661
True-up liability, Ending balance	'	$11,463	$12,259

Fair_Value_Measurement_Changes

Fair Value Measurement (Changes in Fair Value Carrying Amount of Residential Mortgages) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]	'	'
Loans Held-for-sale, Fair Value Disclosure	$11,622	$23,683
Aggregate Fair Value	'	'
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]	'	'
Loans Held-for-sale, Fair Value Disclosure	11,622	23,683
Contractual Balance	'	'
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]	'	'
Loans Held-for-sale, Fair Value Disclosure	11,438	22,765
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$184	$918

Fair_Value_Measurement_Fair_Va1

Fair Value Measurement Fair Value Measurement (Fair Value, by Balance Sheet Grouping) (Details) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, at Carrying Value	$917,822	$258,014	$377,319	$523,113
Cash and Cash Equivalents, Fair Value Disclosure	917,822	258,014	'	'
Available-for-sale	3,273,174	2,920,971	'	'
Held-to-maturity Securities	2,935,688	622,121	'	'
Held-to-maturity Securities, Fair Value	2,824,240	630,799	'	'
Other Investments and Securities, at Cost	180,803	140,717	'	'
Other Investments	180,803	140,717	'	'
Loans Receivable Held-for-sale, Net	11,622	23,683	'	'
Loans Held-for-sale, Fair Value Disclosure	11,622	23,683	'	'
Originated loans and leases receivable, carrying value	10,116,903	8,632,717	'	'
Originated Loans and Leases Receivable Fair Value	10,017,722	8,604,872	'	'
Loans and Leases Receivable, Net Amount	14,159,720	9,608,587	'	'
Covered Loans and Leases Receivable Gross Carrying Amount	547,943	975,870	'	'
Covered Loans and Leases Receivable Fair Value Disclosure	547,943	975,870	'	'
Interest Receivable	52,929	40,389	'	'
Accrued Interest Receivable Fair Value Disclosure	52,929	40,389	'	'
Derivative Asset	47,902	63,231	'	'
Derivative Asset, Fair Value, Gross Asset	47,902	63,231	'	'
Deposits	19,533,601	11,759,425	'	'
Deposits, Fair Value Disclosure	19,532,368	11,765,873	'	'
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	851,535	1,104,525	'	'
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	851,535	1,104,525	'	'
Wholesale borrowings	200,600	136,883	'	'
Other Borrowings, Fair Value	204,124	143,029	'	'
Long-term debt	324,428	0	'	'
Long-term Debt, Fair Value	319,711	'	'	'
Interest Payable	9,339	2,515	'	'
Accrued Liabilities, Fair Value Disclosure	9,339	2,515	'	'
Derivative Liability	58,201	77,968	'	'
Derivative Liability, Fair Value, Gross Liability	58,201	77,968	'	'
Level 1	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	917,822	258,014	'	'
Available-for-sale	3,036	3,241	'	'
Held-to-maturity Securities, Fair Value	0	0	'	'
Other Investments	0	0	'	'
Loans Held-for-sale, Fair Value Disclosure	0	0	'	'
Originated Loans and Leases Receivable Fair Value	0	0	'	'
Covered Loans and Leases Receivable Fair Value Disclosure	0	0	'	'
Accrued Interest Receivable Fair Value Disclosure	0	0	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Deposits, Fair Value Disclosure	0	0	'	'
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	0	0	'	'
Other Borrowings, Fair Value	0	0	'	'
Long-term Debt, Fair Value	0	'	'	'
Accrued Liabilities, Fair Value Disclosure	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Level 2	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	0	0	'	'
Available-for-sale	2,922,527	2,868,069	'	'
Held-to-maturity Securities, Fair Value	2,824,240	630,799	'	'
Other Investments	180,803	140,717	'	'
Loans Held-for-sale, Fair Value Disclosure	11,622	23,683	'	'
Originated Loans and Leases Receivable Fair Value	0	0	'	'
Covered Loans and Leases Receivable Fair Value Disclosure	0	0	'	'
Accrued Interest Receivable Fair Value Disclosure	52,929	40,389	'	'
Derivative Asset, Fair Value, Gross Asset	47,902	63,231	'	'
Deposits, Fair Value Disclosure	19,532,368	11,765,873	'	'
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	851,535	1,104,525	'	'
Other Borrowings, Fair Value	204,124	143,029	'	'
Long-term Debt, Fair Value	319,711	'	'	'
Accrued Liabilities, Fair Value Disclosure	9,339	2,515	'	'
Derivative Liability, Fair Value, Gross Liability	58,201	77,968	'	'
Level 3	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	0	0	'	'
Available-for-sale	347,611	49,661	'	'
Held-to-maturity Securities, Fair Value	0	0	'	'
Other Investments	0	0	'	'
Loans Held-for-sale, Fair Value Disclosure	0	0	'	'
Originated Loans and Leases Receivable Fair Value	10,017,722	8,604,872	'	'
Covered Loans and Leases Receivable Fair Value Disclosure	547,943	975,870	'	'
Accrued Interest Receivable Fair Value Disclosure	0	0	'	'
Derivative Asset, Fair Value, Gross Asset	0	0	'	'
Deposits, Fair Value Disclosure	0	0	'	'
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	0	0	'	'
Other Borrowings, Fair Value	0	0	'	'
Long-term Debt, Fair Value	0	'	'	'
Accrued Liabilities, Fair Value Disclosure	0	0	'	'
Derivative Liability, Fair Value, Gross Liability	0	0	'	'
Acquired Loans	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Originated Loans and Leases Receivable Fair Value	3,627,275	'	'	'
Loans and Leases Receivable, Net Amount	3,494,874	0	'	'
Acquired Loans | Level 1	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Originated Loans and Leases Receivable Fair Value	0	'	'	'
Acquired Loans | Level 2	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Originated Loans and Leases Receivable Fair Value	0	'	'	'
Acquired Loans | Level 3	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Originated Loans and Leases Receivable Fair Value	$3,627,275	'	'	'

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
		Government Agency Issued Bonds or MBS	Government Agency Issued Bonds or MBS
Derivative [Line Items]	'	'	'
Collateral Already Posted, Aggregate Fair Value	'	$70.50	$96.50
Term of written loan commitments, days	'60 days	'	'
Default Assumptions Percentage	100.00%	'	'
Maximum value of the guaranteed derivative instruments	2.8	'	'
Collateral posted against derivative liabilities	'	$70.50	$96.50
Remaining Term on Swap Participation Agreements, Min	'1 year	'	'
Remaining Term on Swap Participation Agreements, Max	'9 years	'	'

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Derivative Instruments Designated as Hedging Instruments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives designated in hedge relationships	'	'
Derivative Asset, Fair Value	$47,902	$63,231
Derivative Liability, Fair Value	58,201	77,968
Interest Rate Swap | Designated as Hedging Instrument	'	'
Derivatives designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	0	0
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	126,637	161,133
Derivative Liability, Fair Value	$11,574	$19,080

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities (Derivative Instruments not Designated as Hedging Instruments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Fair Value	$47,902	$63,231
Derivative Liability, Fair Value	58,201	77,968
Not Designated as Hedging Instrument	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	1,760,450	1,379,768
Derivative Asset, Fair Value	47,902	63,231
Derivative Liability, Notional/Contract Amount	1,743,151	1,391,595
Derivative Liability, Fair Value	46,627	58,888
Not Designated as Hedging Instrument | Interest Rate Swap	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	1,622,525	1,204,835
Derivative Asset, Fair Value	46,577	58,769
Derivative Liability, Notional/Contract Amount	1,622,531	1,204,835
Derivative Liability, Fair Value	46,577	58,769
Not Designated as Hedging Instrument | Mortgage Loan Commitments	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	90,541	168,271
Derivative Asset, Fair Value	891	4,400
Derivative Liability, Notional/Contract Amount	0	0
Derivative Liability, Fair Value	0	0
Not Designated as Hedging Instrument | Forward Contracts	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	40,906	0
Derivative Asset, Fair Value	384	0
Derivative Liability, Notional/Contract Amount	0	124,017
Derivative Liability, Fair Value	0	62
Not Designated as Hedging Instrument | Foreign Exchange	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	6,478	6,662
Derivative Asset, Fair Value	50	62
Derivative Liability, Notional/Contract Amount	6,893	6,026
Derivative Liability, Fair Value	50	57
Not Designated as Hedging Instrument | Credit contracts	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	0	0
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	49,914	25,225
Derivative Liability, Fair Value	0	0
Not Designated as Hedging Instrument | Other Contract	'	'
Derivatives not designated in hedge relationships	'	'
Derivative Asset, Notional/Contract Amount	0	0
Derivative Asset, Fair Value	0	0
Derivative Liability, Notional/Contract Amount	63,813	31,492
Derivative Liability, Fair Value	$0	$0

Derivatives_and_Hedging_Activi5

Derivatives and Hedging Activities (Derivative Instruments, Gain (Loss)) (Details) (Not Designated as Hedging Instrument, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gains and losses recognized in income on non-designated hedging instruments	'	'	'
Gains and losses recognized in income on derivatives	($3,179)	$1,367	($1,643)
Mortgage Loan Commitments | Other income	'	'	'
Gains and losses recognized in income on non-designated hedging instruments	'	'	'
Gains and losses recognized in income on derivatives	-3,509	-559	3,576
Forward Contracts | Other income	'	'	'
Gains and losses recognized in income on non-designated hedging instruments	'	'	'
Gains and losses recognized in income on derivatives	446	1,737	-3,904
Credit contracts | Other income	'	'	'
Gains and losses recognized in income on non-designated hedging instruments	'	'	'
Gains and losses recognized in income on derivatives	-116	189	9
Other [Member] | Other Expenses	'	'	'
Gains and losses recognized in income on non-designated hedging instruments	'	'	'
Gains and losses recognized in income on derivatives	$0	$0	($1,324)

Derivatives_and_Hedging_Activi6

Derivatives and Hedging Activities Derivatives and Hedging Activities (Offsetting Disclosure for Derivative Contracts) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'
offsetting disclosure, derivative asset, fair value, gross	$4,795	$69
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0
offsetting disclosure, net amount, derivative asset, falir value	4,795	69
offseting disclosure, netting adjustment, derivative liability, fair value	-4,837	-69
offsetting disclosure, collateral value, derivative asset	42	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0
offsetting disclosure, derivative liability, fair value, gross	53,407	77,839
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0
offsetting disclosure, net amount, derivative liability, falir value	53,407	77,839
offseting disclosure, netting adjustment, derivative asset, fair value	-4,837	-69
offsetting disclosure, collateral value, derivative liability	-48,570	-77,770
offsetting disclosure, net amount total, derivative liability, fair value	0	0
Designated as Hedging Instrument | Interest Rate Swap	'	'
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'
offsetting disclosure, derivative liability, fair value, gross	11,574	19,080
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0
offsetting disclosure, net amount, derivative liability, falir value	11,574	19,080
offseting disclosure, netting adjustment, derivative asset, fair value	0	0
offsetting disclosure, collateral value, derivative liability	-11,574	-19,080
offsetting disclosure, net amount total, derivative liability, fair value	0	0
Not Designated as Hedging Instrument | Interest Rate Swap	'	'
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'
offsetting disclosure, derivative asset, fair value, gross	4,791	55
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0
offsetting disclosure, net amount, derivative asset, falir value	4,791	55
offseting disclosure, netting adjustment, derivative liability, fair value	-4,791	-55
offsetting disclosure, collateral value, derivative asset	0	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0
offsetting disclosure, derivative liability, fair value, gross	41,787	58,714
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0
offsetting disclosure, net amount, derivative liability, falir value	41,787	58,714
offseting disclosure, netting adjustment, derivative asset, fair value	-4,791	-55
offsetting disclosure, collateral value, derivative liability	-36,996	-58,659
offsetting disclosure, net amount total, derivative liability, fair value	0	0
Not Designated as Hedging Instrument | Foreign Exchange Contract [Member]	'	'
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'
offsetting disclosure, derivative asset, fair value, gross	4	14
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0
offsetting disclosure, net amount, derivative asset, falir value	4	14
offseting disclosure, netting adjustment, derivative liability, fair value	-46	-14
offsetting disclosure, collateral value, derivative asset	42	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0
offsetting disclosure, derivative liability, fair value, gross	46	45
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0
offsetting disclosure, net amount, derivative liability, falir value	46	45
offseting disclosure, netting adjustment, derivative asset, fair value	-46	-14
offsetting disclosure, collateral value, derivative liability	0	-31
offsetting disclosure, net amount total, derivative liability, fair value	$0	$0

Commitments_and_Contingencies_1

Commitments and Contingencies (Narratives) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]	'	'	'
Outstanding, Intrinsic Value	'	$1,800,000	$3,400,000
Allowance for unfunded lending commitments	7,900,000	5,400,000	'
Short-term guarantees	101,900,000	'	'
Financing Receivable, Repurchase Reserve	9,851,000	2,667,000	1,743,000
Residential Mortgage	'	'	'
Loss Contingencies [Line Items]	'	'	'
Financing Receivable, Loans Sold to Third Party Investors	34,600,000	32,500,000	'
Financing Receivable, Repurchase Reserve	8,737,000	1,500,000	470,000
Manufactured Housing	'	'	'
Loss Contingencies [Line Items]	'	'	'
Financing Receivable, Loans Sold to Third Party Investors	6,400,000	8,200,000	'
Financing Receivable, Repurchase Reserve	$1,114,000	$1,167,000	$1,273,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due [Abstract]	'
2014	$14,018
2015	11,871
2016	9,725
2017	8,421
2018	7,007
2019-2028	19,063
Operating Leases, Future Minimum Payments Due	$70,105

Commitments_and_Contingencies_3

Commitments and Contingencies (Schedule of Commitments to Extend Credit) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Loan Commitments	$5,546,635	$4,151,541
Commercial Loan	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Loan Commitments	3,367,625	2,431,023
Consumer Loan	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Loan Commitments	$2,179,010	$1,720,518

Commitments_and_Contingencies_4

Commitments and Contingencies (Schedule of Guarantor Obligations) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Guarantor Obligations [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	$241,482	$178,585
Standby Letters of Credit	'	'
Guarantor Obligations [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	196,400	136,202
Loans Sold with Recourse	'	'
Guarantor Obligations [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	$45,082	$42,383

Commitments_and_Contingencies_5

Commitments and Contingencies (Changes in Repurchase Reserve) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Apr. 12, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'
Financing Receivable, Repurchase Reserve, Beginning Balance	$2,667	$1,743	'
Financing Receivable, Repurchase Reserve, Assumed Obligation	'	'	6,000
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	-5,770	-863	'
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	6,954	1,787	'
Financing Receivable, Repurchase Reserve, Ending Balance	9,851	2,667	'
Residential Mortgage	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'
Financing Receivable, Repurchase Reserve, Beginning Balance	1,500	470	'
Financing Receivable, Repurchase Reserve, Assumed Obligation	'	'	6,000
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	-5,770	-863	'
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	7,007	1,893	'
Financing Receivable, Repurchase Reserve, Ending Balance	8,737	1,500	'
Manufactured Housing	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'
Financing Receivable, Repurchase Reserve, Beginning Balance	1,167	1,273	'
Financing Receivable, Repurchase Reserve, Assumed Obligation	'	'	0
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	0	0	'
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	-53	-106	'
Financing Receivable, Repurchase Reserve, Ending Balance	$1,114	$1,167	'

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)	Dec. 31, 2013	Apr. 12, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 12, 2013	Feb. 04, 2013	Apr. 12, 2013	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified					Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp	Citizens Republic Bancorp
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Interest rate of Non-Cumulative Perpetual Preferred Stock, Series A	'	'	'	'	'	5.88%	'	'
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	'	2,408,203	'	'	2,408,203	'	1,757,812.50	2,471,681
Class of Warrant or Right, Exercise Price of Warrants or Rights	'	'	'	'	'	'	'	18.21
Preferred Stock, Shares Authorized	7,000,000	'	'	'	'	'	'	'
Non-cumulative Perpetual Preferred Stock, Series A, Shares Authorized	115,000	'	'	'	'	'	'	'
Non-cumulative Perpetual Preferred Stock, Shares Outstanding	100,000	'	'	'	'	'	'	'
Outstanding, Intrinsic Value	'	'	$1.80	$3.40	'	'	'	'

Shareholders_Equity_Earnings_P

Shareholders' Equity (Earnings Per Share Reconciliation) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock Option Plan	150,421	109,518	109,102
Net income	$183,684	$134,106	$119,558
Preferred Stock dividends	5,337	0	0
Net income attributable to common shareholders	176,802	134,106	119,558
Less: Net income allocated to participating securities	1,545	0	0
Weighted average number of common shares outstanding - basic	149,607	109,518	109,102
Basic earnings per common share	$1.18	$1.22	$1.10
Diluted earnings per common share	$1.18	$1.22	$1.10
Stock Options	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock Option Plan	814	0	0
Net income attributable to common shareholders	$176,802	$134,106	$119,558

Changes_and_Reclassifications_2

Changes and Reclassifications Out of Other Comprehensive Income Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	($37,579)	'	'
Accumulated other comprehensive loss	-66,876	-16,205	'
Changes in unrealized securities' holding gains and (losses), net of taxes of $46.6 million, $2.2 million, and $10.2 million, respectively	-86,537	4,154	26,205
Other Comprehensive Income Net Gain (Loss) Arising During the Period	-55,376	'	'
Accumulated Other Comprehensive Reclass Amounts During Period-Total	1,822	'	'
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	-1	-52	256
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	2,884	6,836	4,702
Accumulated Net Unrealized Investment Gain (Loss)	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	-29,297	55,418	'
Changes in unrealized securities' holding gains and (losses), net of taxes of $46.6 million, $2.2 million, and $10.2 million, respectively	-86,537	'	'
Accumulated Other Comprehensive Reclass Amounts During Period-Total	1,822	'	'
Pension Benefits	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	'	-71,623	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	$31,161	'	'

Changes_and_Reclassifications_3

Changes and Reclassifications Out of Other Comprehensive Income Changes and Reclassifications Out of Other Comprehensive Income(Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'
Other Comprehensive Income (Loss), Tax	($27,224)	$4,137
Accumulated Other Comprehensive Reclass Amounts During Period-Total	1,822	'
Investment securities losses (gains), net	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'
Realized AFS Gross Realized Gain (Loss)	2,803	'
Income tax expense (benefit)	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'
Other Comprehensive Income (Loss), Tax	($981)	'

Regulatory_Matters_Regulatory_

Regulatory Matters Regulatory Matters Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Regulatory Matters [Abstract]	'	'
Minimum net worth requirement of HUD	$1	$1

Regulatory_Matters_Schedule_of

Regulatory Matters (Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Consolidated	'	'
Total Capital (to Risk Weighted Assets) [Abstract]	'	'
Total Capital	$2,281,812	$1,325,971
Total Capital to Risk Weighted Assets (Ratio)	13.98%	12.50%
Capital Required for Capital Adequacy	1,305,667	848,627
Capital Required for Capital Adequacy to Risk Weighted Assets (Ratio)	8.00%	8.00%
Capital Required to be Well Capitalized	1,632,083	1,060,783
Capital Required to be Well Capitalized to Risk Weighted Assets (Ratio)	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) [Abstract]	'	'
Tier One Risk Based Capital	1,882,725	'
Tier One Risk Based Capital to Risk Weighted Assets (Ratio)	11.54%	11.25%
Tier One Risk Based Capital Required for Capital Adequacy	652,833	424,313
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (Ratio)	4.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	979,250	636,470
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (Ratio)	6.00%	6.00%
Tier I Capital (to Average Assets) [Abstract]	'	'
Tier One Leverage Capital	'	1,193,188
Tier One Leverage Capital to Average Assets (Ratio)	8.15%	8.43%
Tier One Leverage Capital Required for Capital Adequacy	923,887	566,212
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (Ratio)	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	1,154,858	707,765
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (Ratio)	5.00%	5.00%
Bank Only	'	'
Total Capital (to Risk Weighted Assets) [Abstract]	'	'
Total Capital	2,122,124	1,158,312
Total Capital to Risk Weighted Assets (Ratio)	13.02%	10.93%
Capital Required for Capital Adequacy	1,303,579	847,694
Capital Required for Capital Adequacy to Risk Weighted Assets (Ratio)	8.00%	8.00%
Capital Required to be Well Capitalized	1,629,473	1,059,618
Capital Required to be Well Capitalized to Risk Weighted Assets (Ratio)	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) [Abstract]	'	'
Tier One Risk Based Capital to Risk Weighted Assets (Ratio)	12.14%	9.73%
Tier One Risk Based Capital Required for Capital Adequacy	651,789	423,847
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets (Ratio)	4.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	977,684	635,771
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (Ratio)	6.00%	6.00%
Tier I Capital (to Average Assets) [Abstract]	'	'
Tier One Leverage Capital	1,978,140	1,030,585
Tier One Leverage Capital to Average Assets (Ratio)	8.58%	7.29%
Tier One Leverage Capital Required for Capital Adequacy	922,312	565,414
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (Ratio)	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$1,152,890	$706,768
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (Ratio)	5.00%	5.00%