FirstMerit (FMER) 10-Q 6 Nov 13 2013 FY Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2013	Oct. 31, 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-Q	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'FY	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	165,051,574
Entity Well-known Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
ASSETS	'	'	'
Cash and due from banks	$505,228	$244,223	$201,359
Interest-bearing deposits in banks	742,039	13,791	37,058
Total cash and cash equivalents	1,247,267	258,014	238,417
Investment securities:	'	'	'
Held-to-maturity	2,749,934	622,121	620,631
Available-for-sale	3,256,259	2,920,971	2,911,993
Other investments	270,369	140,717	140,730
Loans held for sale	17,813	23,683	17,540
Loans	14,269,166	9,750,784	9,491,349
Allowance for loan losses	-143,835	-142,197	-142,586
Net loans	14,125,331	9,608,587	9,348,763
Premises and equipment, net	324,337	181,149	182,043
Goodwill	734,883	460,044	460,044
Intangible assets	85,447	6,373	6,817
Covered other real estate	70,791	59,855	56,795
Accrued interest receivable and other assets	1,252,555	631,498	645,070
Total assets	24,134,986	14,913,012	14,628,843
Deposits:	'	'	'
Noninterest-bearing	5,461,674	3,338,371	3,231,500
Interest-bearing	2,815,681	1,287,674	1,079,913
Savings and money market accounts	8,575,292	5,758,123	5,744,103
Certificates and other time deposits	2,636,886	1,375,257	1,476,910
Total deposits	19,489,533	11,759,425	11,532,426
Federal funds purchased and securities sold under agreements to repurchase	1,049,801	1,104,525	963,455
Wholesale borrowings	200,858	136,883	178,083
Long-term debt	324,425	0	0
Accrued taxes, expenses and other liabilities	415,724	266,977	330,175
Total liabilities	21,480,341	13,267,810	13,004,139
Shareholders' equity:	'	'	'
Preferred Stock, Value, Issued	100,000	0	0
Common Stock warrant	3,000	0	0
Common Stock, without par value; authorized 300,000,000 shares; issued: September 30, 2013 - 170,179,305 shares; December 31, 2012 and September 30, 2012 - 115,121,731 shares	127,937	127,937	127,937
Capital surplus	1,388,638	475,979	473,781
Accumulated other comprehensive loss	-83,613	-16,205	-13,900
Retained earnings	1,248,554	1,195,850	1,175,001
Treasury stock, at cost: September 30, 2013 - 5,134,681 shares; December 31, 2012 - 5,472,915 shares; September 30, 2012 - 5,468,853 shares	-129,871	-138,359	-138,115
Total shareholders' equity	2,654,645	1,645,202	1,624,704
Total liabilities and shareholders' equity	$24,134,986	$14,913,012	$14,628,843

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Common stock, shares authorized	300,000,000	300,000,000	300,000,000
Common stock, shares issued	170,179,305	115,121,731	115,121,731
5.875% Non-Cumulative Perpetual Preferred stock, Series A, authorized 115,000 shares	7,000,000	'	'
Treasury stock, at cost	5,134,681	5,472,915	5,468,853
Series A Non-Cumulative Perpetual Preferred Stock	'	'	'
5.875% Non-Cumulative Perpetual Preferred stock, Series A, authorized 115,000 shares	115,000	0	0
5.875% Non-Cumulative Perpetual Preferred stock, Series A, 100,000 outstanding	100,000	0	0

Consolidated_Statements_of_Inc

Consolidated Statements of Income and Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:	'	'	'	'
Loans and loans held for sale	$182,107	$103,005	$459,313	$309,213
Investment securities:	'	'	'	'
Taxable	29,766	20,633	78,143	64,834
Tax-exempt	5,624	3,844	15,767	11,270
Total investment securities interest	35,390	24,477	93,910	76,104
Total interest income	217,497	127,482	553,223	385,317
Interest expense:	'	'	'	'
Interest bearing	809	243	1,784	726
Savings and money market accounts	6,495	5,166	18,279	15,302
Certificates and other time deposits	1,712	2,743	7,149	9,436
Securities sold under agreements to repurchase	306	310	949	854
Wholesale borrowings	936	1,130	2,955	3,399
Long-term debt	3,899	0	9,390	'
Total interest expense	14,157	9,592	40,506	29,717
Net interest income	203,340	117,890	512,717	355,600
Provision for originated loan losses	-2,523	-9,965	-11,482	-26,860
Provision for loan and lease losses - acquired loans	2,033	0	2,033	0
Provision for covered loan losses	-1,823	-6,214	-10,119	-15,576
Provision for Loan and Lease Losses	6,379	16,179	23,634	42,436
Net interest income after provision for loan losses	196,961	101,711	489,083	313,164
Other income:	'	'	'	'
Trust department income	9,608	6,124	24,515	17,481
Service charges on deposits	22,146	14,603	55,315	43,490
Credit card fees	13,588	11,006	38,128	32,402
ATM and other service fees	5,216	3,680	13,496	11,360
Bank owned life insurance income	4,351	3,094	12,889	9,073
Investment services and insurance	3,403	2,208	9,247	6,843
Investment securities (losses) gains, net	0	553	-2,803	1,361
Loan sales and servicing income	3,644	7,255	19,492	19,085
Other operating income	9,134	6,402	27,644	20,857
Total other income	71,090	54,925	197,923	161,952
Other expenses:	'	'	'	'
Salaries, wages, pension and employee benefits	97,390	58,061	260,395	183,632
Net occupancy expense	13,816	8,077	35,444	24,640
Equipment expense	11,040	7,143	28,698	21,845
Stationery, supplies and postage	3,801	2,210	9,304	6,638
Bankcard, loan processing and other costs	40,786	8,424	61,043	24,935
Professional services	9,768	4,702	32,322	17,361
Amortization of intangibles	2,972	456	5,700	1,422
FDIC insurance expense	4,925	1,832	12,601	9,015
Other operating expense	26,880	17,682	62,436	51,944
Total other expenses	211,378	108,587	507,943	341,432
Net income before income tax expense	56,673	48,049	179,063	133,684
Income tax expense	15,958	13,096	52,553	37,802
Net income	40,715	34,953	126,510	95,882
Other comprehensive income (loss), net of taxes:	'	'	'	'
Changes in unrealized securities' holding gains and (losses), net of taxes of ($6.3) million and $2.4 million for the quarters ended and ($36.3) million and $5.4 million for the nine months ended, respectively	-11,716	4,884	-69,229	10,872
Reclassification for realized securities' (gains) and losses, net of taxes of ($0.0) million and $0.19 million for the quarters ended and ($0.98)million and $0.48 million for the nine months ended, respectively	0	-359	1,822	-885
Total other comprehensive gain (loss), net of taxes	-11,716	4,525	-67,407	9,987
Comprehensive income	28,999	39,478	59,103	105,869
Net income attributable to common shareholders	38,937	34,797	121,544	95,795
Net income used in diluted EPS calculation	$38,937	$34,797	$121,544	$95,795
Weighted average number of common shares outstanding - basic	165,044	109,645	144,402	109,473
Weighted average number of common shares outstanding - diluted	168,916	109,645	147,341	109,473
Basic earnings per common share	$0.24	$0.32	$0.84	$0.88
Diluted earnings per common share	$0.23	$0.32	$0.82	$0.88
Dividend per common share	$0.16	$0.16	$0.48	$0.48

Statement_of_Income_and_Compre

Statement of Income and Comprehensive Income Paranthetical (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement and Comprehensive Income Paranthetical [Abstract]	'	'	'	'
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	($6,300)	$2,400	($36,300)	$5,400
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	$0	$190	($980)	$480

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, 2011	$1,565,953	$0	$127,937	$0	$479,882	($23,887)	$1,131,203	($149,182)
Net income	95,882	'	'	'	'	'	95,882	'
Other Comprehensive Income (Loss), Net of Tax	9,987	'	'	'	'	9,987	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	105,869	'	'	'	'	'	'	'
Cash dividends - common stock	-52,084	'	'	'	'	'	-52,084	'
Consideration from Common Stock conversion (1.37 ratio)	0	'	'	'	'	'	'	'
Nonvested (restricted) shares granted	0	'	'	'	-14,481	'	'	14,481
Restricted Stock Activity	-2,341	'	'	'	1,023	'	'	-3,364
Deferred compensation trust	0	'	'	'	50	'	'	-50
Share-based compensation	7,258	'	'	'	7,258	'	'	'
Consideration from the warrant issued to the Treasury for Citizens' TARP warrant	0	'	'	'	'	'	'	'
Adjustments to Additional Paid in Capital, Other	49	'	'	'	49	'	'	'
Ending Balance at Sep. 30, 2012	1,624,704	0	127,937	0	473,781	-13,900	1,175,001	-138,115
Beginning Balance at Dec. 31, 2012	1,645,202	0	127,937	0	475,979	-16,205	1,195,850	-138,359
Net income	126,510	'	'	'	'	'	126,510	'
Other Comprehensive Income (Loss), Net of Tax	-67,407	'	'	'	'	-67,408	'	'
Other Comprehensive Loss, net of tax	-67,408	'	'	'	'	'	'	'
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	59,102	'	'	'	'	'	'	'
Dividends, Preferred Stock, Cash	-3,868	'	'	'	'	'	-3,868	'
Cash dividends - common stock	-69,938	'	'	'	'	'	-69,938	'
Consideration from Common Stock conversion (1.37 ratio)	925,272	'	'	'	925,272	'	'	'
Nonvested (restricted) shares granted	-6,814	'	'	'	-19,257	'	'	12,443
Restricted Stock Activity	-2,608	'	'	'	956	'	'	-3,564
Deferred compensation trust	0	'	'	'	391	'	'	-391
Share-based compensation	8,747	'	'	'	8,747	'	'	0
Issuance of preferred stock	96,550	100,000	'	'	-3,450	'	'	'
Consideration from the warrant issued to the Treasury for Citizens' TARP warrant	3,000	'	'	3,000	'	'	'	'
Ending Balance at Sep. 30, 2013	$2,654,645	$100,000	$127,937	$3,000	$1,388,638	($83,613)	$1,248,554	($129,871)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Common Stock, Dividends, Per Share, Cash Paid	$0.48	$0.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	0
Stock Issued During Period, Shares, Restricted Stock Award, Gross	539,132	588,765
Treasury Stock, Shares, Acquired	200,898	186,695
Stock Issued During Period, Shares, Treasury Stock Reissued	174,597	86,174

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating Activities	'	'
Net income	$126,510	$95,882
Adjustments to reconcile net income to net cash provided and used by operating activities:	'	'
Provision for loan losses	23,634	42,436
Benefit for deferred income taxes	-16,824	-13,619
Depreciation and amortization	22,404	17,307
Benefit attributable to FDIC loss share	-8,890	-12,601
Accretion of acquired loans	-199,815	-62,191
Accretion of income for lease financing	-2,674	-2,168
Amortization and accretion of investment securities, net	'	'
Available for sale	15,141	11,352
Held to maturity	5,454	1,239
Losses/(gains) on sales and calls of available-for-sale investment securities, net	2,803	-1,361
Originations of loans held for sale	-462,948	-575,972
Proceeds from sales of loans, primarily mortgage loans sold in the secondary markets	479,623	596,412
Gains on sales of loans, net	-10,805	-7,903
Amortization of Intangible Assets	5,700	1,422
Recognition of stock compensation expense	8,747	7,258
Net decrease in other assets	133,958	35,048
Net decrease in other liabilities	16,516	-34,202
NET CASH PROVIDED BY OPERATING ACTIVITIES	156,314	123,541
Proceeds from sale of investment securities	'	'
Available for sale	2,179,728	190,813
Held to maturity	897	0
Proceeds from prepayments, calls, and maturities of investment securities	'	'
Available for sale	579,023	611,382
Held to maturity	151,626	42,409
Purchases of investment securities	'	'
Available for sale	-847,968	-878,624
Held to maturity	-1,559,733	-98,893
Other	-3,097	-42
Net (increase)/decrease in loans and leases, excluding loans acquired	272,168	-241,290
Purchases of premises and equipment	-27,237	-6,401
Sales of premises and equipment	181	0
Cash received for acquisition, net of cash paid	189,009	'
Cash Acquired from Acquisition	0	'
NET CASH (USED) PROVIDED BY INVESTING ACTIVITIES	934,597	-380,646
Financing Activities	'	'
Net increase in demand accounts	626,602	218,292
Net increase in savings and money market accounts	164,638	148,694
Net decrease in certificates and other time deposits	-337,887	-266,169
Net (decrease) increase in securities sold under agreements to repurchase	-169,729	97,190
Proceeds from issuance of subordinated debt	249,927	0
Net decrease in wholesale borrowings	-655,345	-25,379
Net proceeds from issuance of preferred stock	96,550	0
Cash dividends - common	-69,938	-52,084
Cash dividends - preferred	-3,868	0
Restricted stock activity	-2,608	-2,341
NET CASH (USED) PROVIDED BY FINANCING ACTIVITIES	-101,658	118,203
Increase (decrease) in cash and cash equivalents	989,253	-138,902
Cash and cash equivalents at beginning of year	258,014	377,319
Cash and cash equivalents at end of year	1,247,267	238,417
SUPPLEMENTAL DISCLOSURES	'	'
Consideration from Common Stock conversion (1.37 ratio)	925,272	0
Consideration from the warrant issued to the Treasury for Citizens' TARP warrant	3,000	0
Cash paid during period for:	'	'
Interest, net of amounts capitalized	31,578	27,462
Federal income taxes	27,662	43,421
Warrant	'	'
SUPPLEMENTAL DISCLOSURES	'	'
Consideration from the warrant issued to the Treasury for Citizens' TARP warrant	$3,000	'

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Unless otherwise indicated, defined terms and abbreviations used herein have the meanings set forth in the accompanying Glossary of Acronyms and Abbreviations.
	Basis of Presentation - FirstMerit Corporation is a BHC whose principal asset is the Common Stock of its wholly-owned subsidiary, FirstMerit Bank, N. A. The Parent Company’s other subsidiaries include Citizens Savings Corporation of Stark County, FirstMerit Capital Trust I, FirstMerit Community Development Corporation, 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.
	The accounting and reporting policies of the Corporation conform to GAAP and to general practices within the financial services industry.
	The consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date. The accompanying unaudited interim financial statements reflect all adjustments (consisting only of normally recurring adjustments) that are, in the opinion of Management, necessary for a fair statement of the results for the interim periods presented. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been omitted in accordance with the rules of the SEC. The unaudited consolidated financial statements of the Corporation as of September 30, 2013 and 2012 are not necessarily indicative of the results that may be achieved for the full fiscal year or for any future period. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2012 (the “2012 Form 10-K”). Certain reclassifications of prior year’s amounts have been made to conform to the current year presentation. Such reclassifications had no effect on net earnings or equity.
	As discussed in Note 2 (Business Combinations), on April 12, 2013 (the "Acquisition Date"), the Corporation completed the merger with Citizens, a Michigan corporation. As part of the merger with Citizens, the Corporation now has two active wholly owned trusts that were formed for the purpose of issuing securities and qualify as regulatory capital. Accordingly, the Corporation made a determination as to whether it should consolidate other entities or account for them on the equity method of accounting depending on whether it has a controlling financial interest in an entity of less than 100% of the voting interest of that entity to determine if it is a VIE. A VIE is a corporation, partnership, trust or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. An entity that holds a variable interest in a VIE is required to consolidate the VIE if the entity is subject to a majority of the risk of loss from the VIE's activities, is entitled to receive a majority of the entity's residual returns or both. VIE treatment is considered for entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make financial and operating decisions.
	The two active wholly owned trusts acquired from the merger with Citizens are considered VIEs primarily due to the fact that the Corporation is not the primary beneficiary, and consequently, the trusts are not consolidated in the consolidated financial statements. 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 $25.8 million in aggregate liquidation amount outstanding, respectively, as of September 30, 2013. The gross proceeds from the issuances were used to purchase junior subordinated deferrable interest debentures issued by Citizens, now 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 qualify as Tier 1 capital and are classified as “long-term debt” on the Consolidated Balance Sheets, with the associated interest expense recorded in “long-term debt” on the Consolidated Statements of Comprehensive Income. The expected losses and residual returns of these entities are absorbed by the trust preferred stock holders, and consequently the Corporation is not exposed to loss related to these VIEs.
	There have been no other significant changes to the Corporation’s accounting policies as disclosed in the 2012 Form 10-K.
	In preparing these accompanying unaudited interim consolidated financial statements, subsequent events were evaluated through the time the consolidated financial statements were issued.
	Recently Adopted and Issued Accounting Standards
	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, 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. There is no impact to the Corporation's consolidated financial statements as the Corporation does not have an unrecognized tax benefit.
	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 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 14 (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 2013-11, 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 9 (Derivatives and Hedging Activities).

Business_Combinations

Business Combinations	9 Months Ended
	Sep. 30, 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 $300.0 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 accordingly, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the Acquisition Date. Per the applicable accounting guidance for business combinations, these fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as additional information relative to closing date fair values become available.
	Preliminary goodwill of $274.8 million is calculated as the purchase premium after adjusting for the fair value of 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 $312.9 million and DTL of $51.3 million for a net DTA carryover of $261.6 million. This net DTA includes $224.7 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 $83.5 million was established on the Acquisition Date as a result of the purchase accounting fair market value adjustments resulting in a total net DTA on the Acquisition Date of $345.1 million.
	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 and are subject to refinement for up to one year after the Acquisition Date based on additional information obtained by Management that existed as of the Acquisition Date.
	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		3,202,577
	Loans		4,624,293
	Premises and equipment		138,536
	Intangible assets		84,774		1
	Accrued interest receivable and other assets		678,639
	Total assets		$	9,273,199
	LIABILITIES
	Deposits		$	7,276,754
	Borrowings		908,824
	Accrued taxes, expenses, and other liabilities		78,816
	Total liabilities		$	8,264,394
	Net identifiable assets acquired					1,008,805
	Goodwill					$	274,838
	1 - Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful life for which the core deposit intangible and the trust relationships are being amortized over is 15 years and 12 years, respectively.
	The estimated fair values presented in the above table reflect additional information that the Corporation obtained during the three months ended September 30, 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 and accrued interest receivable decreased $0.2 million, the estimated fair value of premises and equipment decreased $0.2 million, and the estimated fair value of other assets decreased $0.4 million of the Acquisition Date from that originally reported in the three months ended June 30, 2013. The estimated net deferred tax asset increased $0.3 million as a result of these revised fair values. These revised fair value estimates resulted in a net increase to goodwill of $0.5 million from that originally reported in the three months ended June 30, 2013 to $274.8 million, which is recognized in the September 30, 2013 consolidated balance sheet.
	The operating results of the Corporation for the three and nine month periods ended September 30, 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 $164.4 million in interest income, and approximately $31.6 million in net income for the period from the Acquisition Date to September 30, 2013. These amounts are included in the Corporation's consolidated financial statements as of and for the three and nine month periods ending September 30, 2013. Citizens' results of operations prior to the Acquisition Date are not included in the Corporation's consolidated statements of comprehensive income.
	Merger-related charges of $33.4 million and $69.1 million were recorded in the consolidated statement of comprehensive income for the three and nine months ended September 30, 2013, respectively, and include incremental costs to integrate the operations of the Corporation and Citizens. Such expenses were for professional services, costs related to termination of existing contractual arrangements for various services, marketing and promotion expenses, retention and severance and incentive compensation costs, travel costs, and printing, supplies and other costs. The integration of Citizens into the Corporation continues to progress as scheduled. 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 three and nine months ended September 30, 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 $69.1 million in merger 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.
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Total revenue, net of interest expense	$	342,756		$	325,086		$	959,045		$	949,884
	Net income	66,237			89,193			221,468			528,691
	Note: 2012 net income includes approximately $276.8 million of tax benefits as a result of Citizens restoration of its DTA.
	In many cases, determining the fair value of the acquired assets and assumed liabilities required the Corporation to estimate cash flows expected to result from those assets and liabilities and to discount those cash flows at appropriate rates of interest. The most significant of those determinations relates to the valuation of acquired loans. For such loans, the excess of cash flows expected at acquisition over the estimated fair value is recognized as interest income over the remaining lives of the loans. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition reflects the impact of estimated credit losses and other factors, such as prepayments. In accordance with GAAP, there was no carry-over of Citizens' previously established ALLL.
	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 non-impaired). In addition, the loans are further categorized into different loan pools per loan types.
	The provisional fair value of loans at the Acquisition Date are presented in the following table:
		Acquired Impaired			Acquired Non-impaired			Acquired Loans Total
	Commercial
	C&I	$	95,188		$	1,664,912		$	1,760,100
	CRE	380,039			359,066			739,105
	Construction	13,399			17,135			30,534
	Total commercial	488,626			2,041,113			2,529,739
	Consumer
	Residential mortgages	233,007			279,736			512,743
	Installment	54,377			1,165,235			1,219,612
	Home equity lines	48,598			313,601			362,199
	Total consumer	335,982			1,758,572			2,094,554
	Total	$	824,608		$	3,799,685		$	4,624,293
	A reconciliation of the contractual required payments receivable to the carrying amount of acquired loans at the Acquisition Date is as follows:
		Acquired Impaired			Acquired Non-impaired			Acquired Loans Total
	Contractual required payments receivable	$	1,086,503		$	4,020,812		$	5,107,315
	Nonaccretable difference	(130,096		)	—			(130,096		)
	Expected cash flows	956,407			4,020,812			4,977,219
	Accretable yield	(131,799		)	(221,127		)	(352,926		)
	Carrying balance	$	824,608		$	3,799,685		$	4,624,293
	The fair value of the acquired non-impaired loans at the Acquisition Date was $3.8 billion. The gross contractually required principal and interest payments receivable for acquired non-impaired loans was $4.0 billion. The estimate of contractual cash flows not expected to be collected for acquired impaired loans is $130.1 million.
	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 approximately $591.9 million in principal and approximately $60.6 million in prepayment penalty. The two retained FHLB advances totaled $60.0 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 Sheets.
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 Citizens and is junior in right of payment to all future senior indebtedness of Citizens. Citizens 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.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure	'
	3.     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 OCI in shareholders' equity.
			September 30, 2013
			Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	267,470			$	8,249			$	(3,495	)		$	272,224
		Residential mortgage-backed securities:
		U.S. government agencies	983,255				26,155				(10,035		)		999,375
		Commercial mortgage-backed securities:
		U.S. government agencies	58,129				23				(2,220		)		55,932
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,538,991				5,710				(38,995		)		1,505,706
		Non-agency	9				—				—				9
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	98,440				404				(1,690		)		97,154
		Asset-backed securities:
		Collateralized loan obligations	271,856				71				(3,295		)		268,632
		Corporate debt securities	61,582				—				(10,732		)		50,850
		Total debt securities	3,279,732				40,612				(70,462		)		3,249,882
	Equity Securities
		Marketable equity securities	3,096				—				—				3,096
		Non-marketable equity securities	3,281				—				—				3,281
		Total equity securities	6,377				—				—				6,377
		Total securities available for sale	$	3,286,109			$	40,612			$	(70,462	)		$	3,256,259
	Securities held-to-maturity
	Debt securities
		U.S. treasuries	$	5,000			$	5			$	—			$	5,005
		U.S. government agency debentures	25,000				—				(1,136		)		23,864
		U.S. states and political subdivisions	453,230				5,093				(9,257		)		449,066
		Residential mortgage-backed securities:
		U.S. government agencies	377,980				1,068				(8,578		)		370,470
		Commercial mortgage-backed securities:
		U.S. government agencies	50,179				12				(1,025		)		49,166
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,523,792				179				(68,719		)		1,455,252
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	220,410				—				(8,936		)		211,474
		Corporate debt securities	94,343				294				(501		)		94,136
		Total securities held to maturity	$	2,749,934			$	6,651			$	(98,152	)		$	2,658,433
			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
		Non-agency	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
		September 30, 2012
		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
		Cost												Value
Securities available-for-sale
Debt securities
	U.S. government agency debentures	$	35,109			$	28			$	—			$	35,137
	U.S. states and political subdivisions	241,436				17,003				(21		)		258,418
	Residential mortgage-backed securities:
	U.S. government agencies	1,216,671				61,160				—				1,277,831
	Commercial mortgage-backed securities:
	U.S. government agencies	15,434				233				—				15,667
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,188,072				17,836				(383		)		1,205,525
	Non-agency	12				—				—				12
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	66,316				2,349				—				68,665
	Corporate debt securities	61,527				—				(14,034		)		47,493
	Total debt securities	2,824,577				98,609				(14,438		)		2,908,748
	Marketable equity securities	3,245				—				—				3,245
	Total securities available for sale	$	2,827,822			$	98,609			$	(14,438	)		$	2,911,993
Securities held-to-maturity
Debt securities
	U.S. states and political subdivisions	$	262,091			$	6,946			$	(17	)		$	269,020
	Commercial mortgage-backed securities:
	U.S. government agencies	33,149				792				—				33,941
	Residential Collateralized mortgage-backed securities:
	U.S. Government Agencies	129,265				396				—				129,661
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	98,961				1,054				—				100,015
	Corporate Debt Securities	97,165				1,435				—				98,600
	Total securities held to maturity	$	620,631			$	10,623			$	(17	)		$	631,237
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. As of September 30, 2013, the aggregate fair value of the Corporation's general obligation bonds was $0.6 million more than amortized cost. Additionally, the aggregate fair value of the Corporation's general obligation bonds was greater than $10.0 million in twelve of the thirty-eight 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.
	September 30, 2013
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Michigan	178			$	823			$	140,651			$	146,448
Ohio	155			940				146,841				145,656
Illinois	68			1,017				69,302				69,149
Texas	69			774				54,428				53,427
Wisconsin	83			637				51,981				52,856
Pennsylvania	56			889				52,039				49,761
Minnesota	46			658				30,115				30,278
Washington	31			943				29,594				29,222
New Jersey	38			726				27,130				27,604
Missouri	20			978				19,303				19,552
New York	22			590				13,082				12,970
California	18			604				10,666				10,873
Other	116			634				75,569				73,495
Total general obligation bonds	900			$	801			$	720,701			$	721,291
	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				61,047				63,034
Total general obligation bonds	546			$	994			$	522,699			$	542,653
	September 30, 2012
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Ohio	129			$	1,161			$	144,573			$	149,780
Illinois	57			894				48,519				50,964
Pennsylvania	53			961				49,384				50,925
Texas	55			867				45,658				47,698
Wisconsin	31			973				27,857				30,155
New Jersey	39			735				26,794				28,646
Minnesota	44			632				26,189				27,817
Michigan	24			1,139				26,150				27,331
Washington	23			809				17,505				18,598
Missouri	15			1,025				14,241				15,378
New York	18			583				9,980				10,497
California	16			648				9,747				10,371
Other	90			659				56,930				59,277
Total general obligation bonds	594			$	888			$	503,527			$	527,437
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 September 30, 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 September 30, 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 sheets.
	30-Sep-13				31-Dec-12				30-Sep-12
FRB stock	$	55,294			$	21,045			$	21,045
FHLB stock	214,586				119,145				119,145
Other	489				527				540
Total other investments	$	270,369			$	140,717			$	140,730
FRB and FHLB stock are 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 $3.4 billion, $1.6 billion and $1.9 billion at September 30, 2013, December 31, 2012 and September 30, 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.
	Three Months Ended September 30,								Nine Months Ended September 30,
	2013				2012				2013				2012
Proceeds	$	—			$	29,735			$	2,180,624			$	190,813
Realized gains	$	—			$	553			$	3,786			$	1,361
Realized losses	—				—				(6,589		)		—
Net securities (losses)/gains	$	—			$	553			$	(2,803	)		$	1,361
Gross Unrealized Losses and Fair Value
The following table presents the gross unrealized losses and fair value of securities by length of time that individual securities had been in a continuous loss position by major categories of available-for-sale and held-to-maturity securities.
			September 30, 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		$	57,258			$	(3,495	)		100			$	—		$	—		—			$	57,258			$	(3,495	)
	Residential mortgage-backed securities:
	U.S. government agencies		309,239				(10,035		)		23			—			—			—			309,239				(10,035		)
	Commercial mortgage-backed securities:
	U.S. government agencies		50,823				(2,220		)		7			—			—			—			50,823				(2,220		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		1,073,105				(38,995		)		69			—			—			—			1,073,105				(38,995		)
	Commercial collateralized mortgage-backed securities:
	U.S. Government agencies		38,938				(1,690		)		5			—			—			—			38,938				(1,690		)
	Collateralized loan obligations:
	Non-agency		165,359				(3,295		)		26			—			—			—			165,359				(3,295		)
	Corporate debt securities		—				—				—			50,850			(10,732		)	8			50,850				(10,732		)
	Total available-for-sale securities		$	1,694,722			$	(59,730	)		230			$	50,850		$	(10,732	)	8			$	1,745,572			$	(70,462	)
Securities held-to-maturity
Debt securities
	U.S. government agency debentures		$	23,864			$	(1,136	)		1			$	—		$	—		—			$	23,864			$	(1,136	)
	U.S. states and political subdivisions		226,853				(9,243		)		362			987			(14		)	1			227,840				(9,257		)
	Residential mortgage-backed securities:
	U.S. government agencies		252,007				(8,578		)		13			—			—			—			252,007				(8,578		)
	Commercial mortgage-backed securities:
	U.S. government agencies		44,168				(1,025		)		7			—			—			—			44,168				(1,025		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		1,416,238				(68,719		)		64			—			—			—			1,416,238				(68,719		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		191,402				(8,936		)		18			—			—			—			191,402				(8,936		)
	Corporate debt securities		66,774				(501		)		24			—			—			—			66,774				(501		)
	Total held-to-maturity securities		$	2,221,306			$	(98,138	)		489			$	987		$	(14	)	1			$	2,222,293			$	(98,152	)
			December 31, 2012
			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		)
	Non-agency		—				—				—			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	)
			September 30, 2012
			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		$	3,560			$	(21	)		8			$	—		$	—		—			$	3,560			$	(21	)
	Residential mortgage-backed securities:
	U.S. government agencies		—				—				—			—			—			—			—				—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		121,427				(379		)		8			1,581			(4		)	1			123,008				(383		)
	Non-agency		—				—				—			—			—			—			—				—
	Corporate debt securities		—				—				—			47,493			(14,034		)	8			47,493				(14,034		)
	Total available-for-sale securities		$	124,987			$	(400	)		16			$	49,074		$	(14,038	)	9			$	174,061			$	(14,438	)
Securities held-to-maturity
Debt securities
	U.S. states and political subdivisions		$	2,360			$	(17	)		4			$	—		$	—		—			$	2,360			$	(17	)
	Commercial mortgage-backed securities:
	U.S. government agencies		—				—				—			—			—			—			—				—
	Commercial collateralized mortgage-backed securities:																						—				—
	U.S. government agencies		—				—				—			—			—			—			—				—
	Total held-to-maturity securities		$	2,360			$	(17	)		4			$	—		$	—		—			$	2,360			$	(17	)
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 OCI. 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 OCI, net of tax.
Management does not believe that the investment securities that were in an unrealized loss position as of September 30, 2013 represent an OTTI. Total gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. The Corporation does not intend to sell the investment securities that were in an unrealized loss position and it is not more likely than not that the Corporation will be required to sell the investment securities before recovery of their amortized cost bases, which may be at maturity.
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 September 30, 2013. Estimated lives on mortgage-backed securities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
Investment	'
			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		$	—			$	—			$	14,460			$	3,649		$	17,085		$	7,125			$	1			$	—		$	13,568		$	—		$	55,888		3.51	%
	Over one year through five years		—				—				53,128				797,680			5,109			1,204,551				8				71,890			11,838			—			2,144,204			2.3	%
	Over five years through ten years		—				—				171,184				198,046			33,738			294,030				—				25,264			243,226			—			965,488			2.63	%
	Over ten years		—				—				33,452				—			—			—				—				—			—			50,850			84,302			2.18	%
	Fair Value		$	—			$	—			$	272,224			$	999,375		$	55,932		$	1,505,706			$	9			$	97,154		$	268,632		$	50,850		$	3,249,882		2.42	%
	Amortized Cost		$	—			$	—			$	267,470			$	983,255		$	58,129		$	1,538,991			$	9			$	98,440		$	271,856		$	61,582		$	3,279,732
	Weighted-Average Yield		—		%		—		%		5.23		%		2.78		%	2.1		%	1.85		%		3.68		%		1.8		%	2.14		%	0.97		%	2.42		%
	Weighted-Average Maturity		—				—				6.98				4.1			4.29			4.26				1.37				4.37			6.37			14.06			4.8
	Securities Held to Maturity
	Remaining maturity:
	One year or less		$	—			$	—			$	47,561			$	—		$	—		$	—			$	—			$	—		$	—		$	—		$	47,561		1.38	%
	Over one year through five years		—				5,005				47,157				137,350			15,120			1,088,688				—				97,014			—			74,487			1,464,821			1.66	%
	Over five years through ten years		23,864				—				152,100				233,120			34,046			366,564				—				114,460			—			19,649			943,803			2.21	%
	Over ten years		—				—				202,248				—			—			—				—				—			—			—			202,248			5.07	%
	Fair Value		$	23,864			$	5,005			$	449,066			$	370,470		$	49,166		$	1,455,252			$	—			$	211,474		$	—		$	94,136		$	2,658,433		2.11	%
	Amortized Cost		$	25,000			$	5,000			$	453,230			$	377,980		$	50,179		$	1,523,792			$	—			$	220,410		$	—		$	94,343		$	2,749,934
	Weighted-Average Yield		1.43		%		0.25		%		4.54		%		1.87		%	1.74		%	1.57		%		—		%		2.26		%	—		%	2.19		%	2.11		%
	Weighted-Average Maturity		6.08				1.33				11.24				5.81			5.81			4.6				—				5.41			—			4.29			5.68

Loans_Loans_Footnote_Notes

Loans Loans Footnote (Notes)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Financing Receivables	'
	4.     Loans
	Loans outstanding as of September 30, 2013, December 31, 2012 and September 30, 2012, net of unearned income, consisted of the following:
			September 30, 2013				December 31, 2012				September 30, 2012
	Originated loans (a):
	Commercial		$	6,420,369			$	5,866,489			$	5,511,678
	Residential mortgage		487,283				445,211				439,062
	Installment		1,647,095				1,328,258				1,321,081
	Home equity		889,372				806,078				789,743
	Credit cards		145,113				146,387				143,918
	Leases		199,907				139,236				110,938
		Total originated loans (a)	9,789,139				8,731,659				8,316,420
	Allowance for originated loan losses		(98,291		)		(98,942		)		(98,942		)
		Net originated loans	$	9,690,848			$	8,632,717			$	8,217,478
	Acquired loans:
	Commercial		$	1,971,062			$	—			$	—
	Residential mortgage		467,608				—				—
	Installment		1,080,298				—				—
	Home equity		306,783				—				—
		Total acquired loans	3,825,751				—				—
	Allowance for acquired loan losses		—				—				—
		Net acquired loans	$	3,825,751			$	—			$	—
	Covered loans:
	Commercial		422,225				718,437				847,741
	Residential mortgage		52,796				61,540				63,779
	Installment		6,361				8,189				8,360
	Home equity		102,908				117,225				123,178
	Indemnification asset		69,986				113,734				131,871
		Total covered loans	654,276				1,019,125				1,174,929
	Allowance for covered loan losses		(45,544		)		(43,255		)		(43,644		)
		Net covered loans	$	608,732			$	975,870			$	1,131,285
	Total loans:
	Commercial		$	8,813,656			$	6,584,926			$	6,359,419
	Residential mortgage		1,007,687				506,751				502,841
	Installment		2,733,754				1,336,447				1,329,441
	Home equity		1,299,063				923,303				912,921
	Credit cards		145,113				146,387				143,918
	Leases		199,907				139,236				110,938
	Indemnification asset		69,986				113,734				131,871
		Total loans	14,269,166				9,750,784				9,491,349
	Total allowance for loan losses		(143,835		)		(142,197		)		(142,586		)
		Total Net loans	$	14,125,331			$	9,608,587			$	9,348,763
	(a) Includes acquired FirstBank loans of $51.9 million, $54.2 million, and $56.0 million as of September 30, 2013, December 31, 2012 and September 30, 2012, respectively.
	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 $7.5 million, $6.5 million and $5.8 million at September 30, 2013, December 31, 2012 and September 30, 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 between those considered to be performing (“non-impaired acquired 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. The outstanding balance, including contractual principal, interest, fees and penalties, of all acquired loans was $4.2 billion as of September 30, 2013.
	The following table presents the provisional fair value of loans acquired from Citizens as of the Acquisition Date:
		Acquired Impaired				Acquired Non-Impaired				Acquired Loans Total
	Commercial
	C&I	$	95,188			$	1,664,912			$	1,760,100
	CRE	380,039				359,066				739,105
	Construction	13,399				17,135				30,534
	Total commercial	488,626				2,041,113				2,529,739
	Consumer
	Residential mortgages	233,007				279,736				512,743
	Installment	54,377				1,165,235				1,219,612
	Home equity lines	48,598				313,601				362,199
	Total consumer	335,982				1,758,572				2,094,554
	Total	$	824,608			$	3,799,685			$	4,624,293
	A reconciliation of the contractual required payments receivable to the carrying amount of acquired loans at the Acquisition Date is as follows:
		Acquired Impaired				Acquired Non-Impaired				Acquired Loans Total
	Contractual required payments receivable	$	1,086,503			$	4,020,812			$	5,107,315
Nonaccretable difference	(130,096		)		—				(130,096		)
Expected cash flows	956,407				4,020,812				4,977,219
Accretable yield	(131,799		)		(221,127		)		(352,926		)
Carrying balance	$	824,608			$	3,799,685			$	4,624,293
The fair value estimates for acquired loans is based on expected prepayments and the amount and timing of undiscounted expected principal, interest and other cash flows. Credit discounts representing the principal losses expected over the life of the loan are also a component of the initial fair value. In determining the Acquisition Date fair value of acquired impaired loans, and in subsequent accounting, the Corporation aggregates purchased consumer loans and commercial loans into pools of loans with common risk characteristics.
The difference between the fair value of a non-impaired acquired loan and contractual amounts due at the Acquisition Date is accreted into income over the estimated life of the loan. Contractually required payments represent the total undiscounted amount of all uncollected principal and interest payments. Non-impaired acquired loans are placed on nonaccrual status and reported as nonperforming or past due using the same criteria applied to the originated portfolio.
The excess of an acquired impaired loan's contractually required payments over the amount of its undiscounted cash flows expected to be collected is referred to as the non-accretable difference. The non-accretable difference, which is neither accreted into income nor recorded on the consolidated balance sheet, reflects estimated future credit losses and uncollectible contractual interest expected to be incurred over the life of the acquired impaired loan. The excess of cash flows expected to be collected over the carrying amount of the acquired impaired loans is referred to as the accretable yield. This amount is accreted into interest income over the remaining life of the acquired impaired loans or pools using the level yield method. The accretable yield is affected by changes in interest rate indices for variable rate loans, changes in prepayment speed assumptions and changes in expected principal and interest payments over the estimated lives of the acquired impaired loans.
Over the life of acquired impaired loans, the Corporation evaluates the remaining contractual required payments receivable and estimates cash flows expected to be collected. Contractually required payments receivable may increase or decrease for a variety of reasons, for example, when the contractual terms of the loan agreement are modified, when interest rates on variable rate loans change, or when principal and/or interest payments are received. Cash flows expected to be collected on acquired impaired loans are estimated by incorporating several key assumptions similar to the initial estimate of fair value. These key assumptions include probability of default, loss given default, and the amount of actual prepayments after the Acquisition Date. Prepayments affect the estimated life of loans and could change the amount of interest income, and possibly principal, expected to be collected. In reforecasting future estimated cash flows, credit loss expectations are adjusted as necessary. These adjustments are based, in part, on actual loss severities recognized for each loan type, as well as changes in the probability of default. For periods in which estimated cash flows are not re-forecasted, the prior reporting period's estimated cash flows are adjusted to reflect the actual cash received and credit events that transpired during the current reporting period.
Increases in expected cash flows of acquired impaired loans subsequent to acquisition are recognized prospectively through adjustment of the yield on the loans or pools over its remaining life, while decreases in expected cash flows are recognized as impairment through a provision for loan loss and an increase in the ALLL.
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 as described above. 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. The loss share receivable continues to be measured on the same basis as the related covered loans. Deterioration in the credit quality of the covered loans (recorded as an adjustment to the covered ALLL) 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 covered 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.
Changes in the loss share receivable associated with covered loans for the three and nine months ended September 30, 2013 and 2012 were as follows:
	Three Months Ended September 30,								Nine Months Ended September 30,
	2013				2012				2013				2012
Balance at beginning of period	$	83,910			$	152,615			$	113,734			$	205,664
Accretion	(5,226		)		(8,401		)		(19,327		)		(26,935		)
Increase due to impairment	1,032				1,484				8,890				12,601
FDIC reimbursement	(7,284		)		(12,597		)		(23,231		)		(50,678		)
Covered loans paid in full	(2,446		)		(1,229		)		(10,080		)		(8,780		)
Balance at end of the period	$	69,986			$	131,872			$	69,986			$	131,872
Acquired and Covered Impaired Loans
Changes in the carrying amount and accretable yield for acquired impaired loans were as follows for the three months ended September 30, 2013:
Acquired Impaired Loans	Three Months Ended September 30, 2013
	Accretable Yield				Carrying Amount of Loans
Balance at beginning of period	$	118,459			$	757,029
Additions	—				—
Accretion	(8,827		)		8,827
Net reclassifications from non-accretable to accretable	—				—
Payments received, net	—				(92,536		)
Disposals	(5,422		)		—
Balance at end of period	$	104,210			$	673,320
A reconciliation of the contractual required payments receivable to the carrying amount of the acquired impaired loans as of September 30, 2013 is as follows:
Acquired Impaired Loans	September 30, 2013
Contractual required payments receivable	$	907,626
Nonaccretable difference	(130,096		)
Expected cash flows	777,530
Accretable yield	(104,210		)
Carrying balance	$	673,320
Changes in the carrying amount and accretable yield for covered impaired loans were as follows for the three and nine months ended September 30, 2013 and 2012:
	Three Months Ended September 30,															Nine Months Ended September 30,
	2013								2012							2013						2012
Covered Impaired Loans	Accretable				Carrying				Accretable				Carrying			Accretable			Carrying			Accretable			Carrying
	Yield				Amount of				Yield				Amount of			Yield			Amount of			Yield			Amount of
					Loans								Loans						Loans						Loans
Balance at beginning of period	$	81,758			$	537,257			$	147,576			$	964,314		$	113,288		$	762,386		$	176,736		$	1,128,978
Accretion	(14,056		)		14,056				(23,631		)		23,631			(51,327		)	51,327			(75,478		)	75,478
Net reclassifications from non-accretable to accretable	12,745				—				6,008				—			28,726			—			30,814			—
Payments received, net	—				(103,514		)		—				(96,593		)	—			(365,914		)	—			(313,104		)
Disposals	(1,309		)		—				(1,929		)		—			(11,549		)	—			(4,048		)	—
Balance at end of period	$	79,138			$	447,799			$	128,024			$	891,352		$	79,138		$	447,799		$	128,024		$	891,352
A reconciliation of the contractual required payments receivable to the carrying amount of covered impaired loans as of September 30, 2013 and 2012 is as follows:
Covered Impaired Loans	September 30, 2013				September 30, 2012
Contractual required payments receivable	$	811,319			$	1,333,127
Nonaccretable difference	(284,382		)		(313,751		)
Expected cash flows	526,937				1,019,376
Accretable yield	(79,138		)		(128,024		)
Carrying balance	$	447,799			$	891,352
The most recent quarterly evaluation of the remaining contractual required payments receivable and cash flows expected to be collected resulted in a decline in cash flow expectations of certain pools of loans and improvements in cash flow expectations in other loans and pools of loans. The decline in cash flow expectations was the result of deteriorations in risk ratings, declines in the underlying value of collateral dependent loans and actual cash flows received lower than originally expected. The improvement in cash flow expectations was the result of positive changes in risk ratings, improvements in the underlying value of collateral dependent loans and actual cash flows received higher than expected. There were no significant changes from prior periods to key assumptions used in the most recent quarterly evaluation of cash flows expected to be collected.
The decline in expected cash flows resulted in a provision for covered loan losses of $2.9 million for the three months ended September 30, 2013 compared to a provision of $7.7 million for the three months ended September 30, 2012. Provision for covered loan losses for the nine months ended September 30, 2013 was $19.0 million compared to $28.2 million for the nine months ended September 30, 2012. The provision for covered loan losses was partially offset by an increase in the loss share receivable for the portion of the losses recoverable under the loss sharing agreements. (See Note 5 (Allowance for Loan and Lease Losses) for further information.)
The increase in cash flows resulted in the reclassification from nonaccretable difference to accretable yield of $12.7 million during the three months ended September 30, 2013 compared to a reclassification of $6.0 million in the three months ended September 30, 2012. Reclassifications to accretable yield were $28.7 million during the nine months ended September 30, 2013 and $30.8 million during the nine months ended September 30, 2012. Reclassifications result in yield adjustments on loans and pools on a prospective basis to interest income. Improved cash flows expectations for loans or pools that were impaired during prior periods were recorded first as a recapture of any previously recorded impairment and then as an increase in the prospective yield. Additionally, the loss share receivable was also reduced by the guaranteed portion of the additional cash flows expected to be received, resulting in a corresponding reduction in the prospective yield of the remaining loss share receivable.
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 is accreted on the loan or loan pool.
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 September 30, 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	$	3,571			$	3,889			$	4,931			$	12,391		$	3,851,704		$	3,864,095		$	201		$	5,234
CRE	2,794				1,414				8,976				13,184			2,214,228			2,227,412			1,047			13,821
Construction	—				—				24				24			328,838			328,862			—			85
Leases	726				—				—				726			199,181			199,907			—			—
Consumer
Installment	9,825				3,392				5,378				18,595			1,628,500			1,647,095			4,506			3,894
Home Equity Lines	1,094				498				1,118				2,710			886,662			889,372			500			2,038
Credit Cards	781				434				700				1,915			143,198			145,113			365			422
Residential Mortgages	13,487				3,771				9,344				26,602			460,681			487,283			5,833			10,094
Total	$	32,278			$	13,398			$	30,471			$	76,147		$	9,712,992		$	9,789,139		$	12,452		$	35,588
Acquired Loans																						≥ 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	$	5,379			$	331			$	3,239			$	8,949		$	974,271		$	983,220		$	—		$	5,301
CRE	3,068				2,816				26,766				32,650			937,010			969,660			—			691
Construction	—				—				—				—			18,182			18,182			—			—
Consumer
Installment	10,883				2,866				1,446				15,195			1,065,103			1,080,298			—			954
Home Equity Lines	3,779				982				3,522				8,283			298,500			306,783			—			2,184
Residential Mortgages	18,346				3,203				10,723				32,272			435,336			467,608			2,967			769
Total	$	41,455			$	10,198			$	45,696			$	97,349		$	3,728,402		$	3,825,751		$	2,967		$	9,899
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	$	3,729			$	730			$	12,493			$	16,952		$	66,287		$	83,239		n/a			n/a
CRE	1,299				5,672				117,839				124,810			184,087			308,897			n/a			n/a
Construction	943				—				25,996				26,939			3,150			30,089			n/a			n/a
Consumer
Installment	57				4				—				61			6,300			6,361			n/a			n/a
Home Equity Lines	1,532				22				1,781				3,335			99,574			102,909			n/a			n/a
Residential Mortgages	8,333				661				5,966				14,960			37,835			52,795			n/a			n/a
Total	$	15,893			$	7,089			$	164,075			$	187,057		$	397,233		$	584,290		n/a			n/a
(a) Installment loans 90 days or more past due and accruing include $2.9 million of loans guaranteed by the U.S. government as of September 30, 2013.
(b) Excludes loss share receivable of $70.0 million as of September 30, 2013.
(c) Acquired and covered impaired loans were not classified as nonperforming assets at September 30, 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 and covered impaired loans. These asset quality disclosures are, therefore, not applicable to acquired and covered 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) Covered 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 covered impaired loans. These asset quality disclosures are, therefore, not applicable to covered impaired loans.
As of September 30, 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	$	8,781			$	2,795			$	1,519			$	13,095		$	3,036,136		$	3,049,231		$	57		$	9,995
CRE	3,197				3,856				16,876				23,929			2,129,413			2,153,342			1,862			20,574
Construction	116				—				853				969			308,136			309,105			—			923
Leases	7				—				—				7			110,931			110,938			—			—
Consumer
Installment	8,934				3,430				4,834				17,198			1,303,883			1,321,081			4,439			3,267
Home Equity Lines	1,840				472				1,411				3,723			786,020			789,743			541			1,858
Credit Cards	991				556				808				2,355			141,563			143,918			393			525
Residential Mortgages	14,427				2,777				6,233				23,437			415,625			439,062			2,399			13,169
Total	$	38,293			$	13,886			$	32,534			$	84,713		$	8,231,707		$	8,316,420		$	9,691		$	50,311
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	$	2,962			$	973			$	27,035			$	30,970		$	131,721		$	162,691		n/a			n/a
CRE	4,965				21,919				184,067				210,951			412,323			623,274			n/a			n/a
Construction	—				998				41,325				42,323			19,453			61,776			n/a			n/a
Consumer
Installment	2,289				—				35				2,324			6,036			8,360			n/a			n/a
Home Equity Lines	1,398				435				1,981				3,814			119,364			123,178			n/a			n/a
Residential Mortgages	10,382				1,248				8,576				20,206			43,573			63,779			n/a			n/a
Total	$	21,996			$	25,573			$	263,019			$	310,588		$	732,470		$	1,043,058		n/a			n/a
(a) Installment loans 90 days or more past due and accruing include $3.1 million of loans guaranteed by the U.S. government as of September 30, 2012.
(b) Excludes loss share receivable of $131.9 million as of September 30, 2012.
(c) Covered impaired loans were not classified as nonperforming assets at September 30, 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 covered impaired loans. These asset quality disclosures are, therefore, not applicable to covered 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 September 30, 2013
Originated Loans	Commercial
	C&I				CRE				Construction				Leases
Grade 1	$	32,144			$	1,216			$	—			$	9,932
Grade 2	82,906				3,711				—				3,173
Grade 3	867,186				368,918				27,041				29,631
Grade 4	2,796,101				1,770,768				300,154				152,778
Grade 5	48,912				30,502				323				3,325
Grade 6	36,846				52,297				1,344				1,068
Grade 7	—				—				—				—
Total	$	3,864,095			$	2,227,412			$	328,862			$	199,907
Acquired Loans	Commercial
	C&I				CRE				Construction				Leases
Grade 1	$	—			$	—			$	—			$	—
Grade 2	96				—				—				—
Grade 3	27,827				29,123				—				—
Grade 4	849,858				744,362				18,182				—
Grade 5	60,968				102,256				—				—
Grade 6	44,471				93,919				—				—
Grade 7	—				—				—				—
Total	$	983,220			$	969,660			$	18,182			$	—
Covered Loans	Commercial
	C&I				CRE				Construction				Leases
Grade 1	$	—			$	—			$	—			$	—
Grade 2	996				—				—				—
Grade 3	—				—				—				—
Grade 4	45,557				116,056				601				—
Grade 5	624				15,364				943				—
Grade 6	33,957				176,286				26,401				—
Grade 7	2,105				1,191				2,144				—
Total	$	83,239			$	308,897			$	30,089			$	—
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	—				—				—				—
Grade 8	—				—				—				—
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				—
Grade 8	—				—				—				—
Total	$	128,509			$	539,595			$	50,333			$	—
As of September 30, 2012
Originated Loans	Commercial
	C&I				CRE				Construction				Leases
Grade 1	$	37,327			$	—			$	—			$	13,785
Grade 2	105,504				3,170				—				190
Grade 3	573,561				278,017				19,312				8,857
Grade 4	2,215,336				1,738,257				282,438				87,259
Grade 5	60,803				54,655				2,893				514
Grade 6	56,700				79,243				4,462				333
Grade 7	—				—				—				—
Grade 8	—				—				—				—
Total	$	3,049,231			$	2,153,342			$	309,105			$	110,938
Covered Loans	Commercial
	C&I				CRE				Construction				Leases
Grade 1	$	—			$	—			$	—			$	—
Grade 2	1,742				—				—				—
Grade 3	92				449				—				—
Grade 4	91,101				240,630				494				—
Grade 5	3,844				39,883				—				—
Grade 6	61,192				340,063				58,586				—
Grade 7	4,720				2,249				2,696				—
Total	$	162,691			$	623,274			$	61,776			$	—

Allowance_for_Loan_Losses_Note

Allowance for Loan Losses (Notes)	9 Months Ended
	Sep. 30, 2013
Allowance for loan losses [Abstract]	'
Allowance for Credit 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.
	Originated Allowance for 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 three and nine months ended September 30, 2013 and 2012, as well as the corresponding recorded investment in originated loans at the end of the period:
	As of September 30, 2013
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Three Months Ended
	Allowance for originated loan losses, beginning balance		$	45,167			$	16,823			$	2,044			$	909			$	8,725			$	13,266			$	7,288			$	4,423		$	98,645
	Charge-offs		(1,011		)		(211		)		—				—				(3,582		)		(1,843		)		(1,367		)		(501		)	(8,515		)
	Recoveries		1,162				168				394				11				2,624				802				438				39			5,638
	Provision for loan losses		(2,140		)		(1,632		)		267				99				2,710				662				1,147				1,410			2,523
	Allowance for originated loan losses, ending balance		$	43,178			$	15,148			$	2,705			$	1,019			$	10,477			$	12,887			$	7,506			$	5,371		$	98,291
	Nine Months 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		(5,114		)		(1,014		)		(516		)		(1,237		)		(11,788		)		(5,177		)		(4,229		)		(1,185		)	(30,260		)
	Recoveries		5,745				503				483				100				7,859				1,884				1,420				133			18,127
	Provision for loan losses		6,338				(4,467		)		(1,083		)		1,517				3,252				2,456				2,931				538			11,482
	Allowance for originated loan losses, ending balance		$	43,178			$	15,148			$	2,705			$	1,019			$	10,477			$	12,887			$	7,506			$	5,371		$	98,291
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	1,336			$	488			$	—			$	—			$	552			$	197			$	261			$	1,302		$	4,136
		Collectively evaluated for impairment	41,842				14,660				2,705				1,019				9,925				12,690				7,245				4,069			94,155
	Total ending allowance for originated loan losses balance		$	43,178			$	15,148			$	2,705			$	1,019			$	10,477			$	12,887			$	7,506			$	5,371		$	98,291
	Originated loans:
		Originated loans individually evaluated for impairment	$	7,476			$	19,755			$	958			$	—			$	30,608			$	6,787			$	1,253			$	23,064		$	89,901
		Originated loans collectively evaluated for impairment	3,856,619				2,207,657				327,904				199,907				1,616,487				882,585				143,860				464,219			9,699,238
	Total ending originated loan balance		$	3,864,095			$	2,227,412			$	328,862			$	199,907			$	1,647,095			$	889,372			$	145,113			$	487,283		$	9,789,139
	As of September 30, 2012
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Three Months Ended
	Allowance for originated loan losses, beginning balance		$	40,327			$	27,186			$	5,147			$	358			$	13,029			$	5,449			$	6,690			$	5,663		$	103,849
	Charge-offs		(8,773		)		(727		)		(127		)		—				(5,507		)		(2,784		)		(1,390		)		(1,691		)	(20,999		)
	Recoveries		1,408				180				61				—				2,883				1,007				488				100			6,127
	Provision for loan losses		6,197				(1,461		)		(277		)		148				1,430				1,213				1,447				1,268			9,965
	Allowance for originated loan losses, ending balance		$	39,159			$	25,178			$	4,804			$	506			$	11,835			$	4,885			$	7,235			$	5,340		$	98,942
	Nine Months 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		(19,906		)		(3,496		)		(165		)		—				(14,441		)		(7,373		)		(4,618		)		(3,431		)	(53,430		)
	Recoveries		3,120				825				364				38				9,104				2,588				1,583				191			17,813
	Provision for loan losses		23,582				(4,008		)		(568		)		127				(809		)		2,904				2,901				2,731			26,860
	Allowance for originated loan losses, ending balance		$	39,159			$	25,178			$	4,804			$	506			$	11,835			$	4,885			$	7,235			$	5,340		$	98,942
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	2,900			$	1,953			$	117			$	—			$	1,674			$	95			$	106			$	1,599		$	8,444
		Collectively evaluated for impairment	36,259				23,225				4,687				506				10,161				4,790				7,129				3,741			90,498
	Total ending allowance for originated loan losses balance		$	39,159			$	25,178			$	4,804			$	506			$	11,835			$	4,885			$	7,235			$	5,340		$	98,942
	Originated loans:
		Originated loans individually evaluated for impairment	$	9,994			$	28,972			$	3,577			$	—			$	32,577			$	6,922			$	1,767			$	24,569		$	108,378
		Originated loans collectively evaluated for impairment	3,039,235				2,124,370				305,528				110,938				1,288,505				782,820				142,152				414,494			8,208,042
	Total ending originated loan balance		$	3,049,229			$	2,153,342			$	309,105			$	110,938			$	1,321,082			$	789,742			$	143,919			$	439,063		$	8,316,420
	The following table presents the originated allowance for loan loss and the recorded investment as of December 31, 2012:
	As of December 31, 2012
		Originated Loans	C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	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:
		Loans individually evaluated for impairment	$	6,187			$	24,007			$	3,405			$	—			$	30,870			$	6,281			$	1,612			$	24,009		$	96,371
		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
Acquired Allowance for 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 non-impaired acquired loans is estimated using a methodology similar to that used for originated loans. The allowance determined for each non-impaired acquired loan is compared to the remaining fair value discount for that loan. If the allowance is greater, the excess is added to the allowance through a provision for loan losses. If the allowance is less, no additional allowance or provision is recognized. Actual losses first reduce any remaining fair value discount for the loan. Once the discount is fully depleted, losses are applied against the allowance established for that loan. During the three months ended September 30, 2013, provision, equal to net charge-offs, of $2.0 million was recorded on individual non-impaired acquired consumer loans. Such loans were written off in accordance with the Corporation's credit policies based on a predetermined number of days past due.
Management reforecasts the estimate of cash flows expected to be collected on each acquired impaired loan pool 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. There was no impairment recognized on these loans during the three months ended September 30, 2013.
No allowance has been established on acquired loans since the Acquisition Date through September 30, 2013.
Covered Allowance for Loan Losses
The ALLL on 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.
The following table presents activity in the covered allowance for loan loss for the three and nine months ended September 30, 2013 and 2012:
		Three Months Ended September 30,								Nine Months Ended September 30,
Covered Allowance for Loan Losses		2013				2012				2013				2012
Balance at beginning of the period		$	49,069			$	42,606			$	43,255			$	36,417
	Provision for loan losses before benefit attributable to FDIC loss share agreements	2,855				7,698				19,009				28,177
	Benefit attributable to FDIC loss share agreements	(1,032		)		(1,484		)		(8,890		)		(12,601		)
Net provision for loan losses		1,823				6,214				10,119				15,576
Increase in indemnification asset		1,032				1,484				8,890				12,601
Loans charged-off		(6,380		)		(6,660		)		(16,720		)		(20,950		)
Balance at end of the period		$	45,544			$	43,644			$	45,544			$	43,644
In the three months ended September 30, 2013, the current impairment of $2.9 million was less than the current charge-offs of $6.4 million resulting in a net decrease to the covered ALLL from the prior quarter. The current period impairment was recorded by a charge to the provision for covered loan losses of $2.9 million with a related increase of $1.0 million in the loss share receivable for the portion of the losses recoverable under the loss sharing agreements. The net provision from the covered portfolio was $1.8 million in the three months ended September 30, 2013 compared to $6.2 million in the three months ended September 30, 2012. The net provision from the covered portfolio was $10.1 million in the nine months ended September 30, 2013 compared to $15.6 million in the nine months ended September 30, 2012.
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. Acquired and covered impaired loans are not subject to individual evaluation for impairment and are not reported with impaired loans. Non-impaired acquired loans that are subsequently placed on non-accrual status are reported as impaired loans. Interest income recognized on impaired loans during the three months ended September 30, 2013 and 2012 was not material.
Loan impairment for loans 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.
As of September 30, 2013
Originated Loans						Unpaid								Average
		Recorded				Principal				Related				Recorded
		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	3,826			$	7,887			$	—			$	11,842
	CRE	15,836				21,921				—				18,884
	Construction	958				1,237				—				1,851
Consumer
	Installment	3,051				4,344				—				3,521
	Home equity line	1,046				1,386				—				1,107
	Credit card	48				48				—				74
	Residential mortgages	10,363				12,899				—				10,122
Subtotal		35,128				49,722				—				47,401
Impaired loans with a related allowance
Commercial
	C&I	3,650				5,526				1,336				3,829
	CRE	3,920				4,251				488				4,126
	Construction	—				—				—				—
Consumer
	Installment	25,528				25,616				552				26,172
	Home equity line	5,869				5,869				197				6,017
	Credit card	1,205				1,205				261				1,352
	Residential mortgages	12,702				12,784				1,302				11,866
Subtotal		52,874				55,251				4,136				53,362
	Total impaired loans	$	88,002			$	104,973			$	4,136			$	100,763
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.
As of December 31, 2012
Originated Loans						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 represents partial charge offs.
As of September 30, 2012
Originated Loans						Unpaid								Average
		Recorded				Principal				Related				Recorded
		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	1,443			$	10,154			$	—			$	9,903
	CRE	16,910				22,337				—				19,217
	Construction	3,370				3,944				—				4,080
Consumer
	Installment	2,902				4,739				—				4,888
	Home equity line	959				1,239				—				1,237
	Credit card	4				4				—				4
	Residential mortgages	10,693				12,838				—				11,542
Subtotal		36,281				55,255				—				50,871
Impaired loans with a related allowance
Commercial
	C&I	8,551				12,555				2,900				10,163
	CRE	11,543				14,113				1,953				10,559
	Construction	726				726				117				733
Consumer
	Installment	29,675				29,675				1,674				30,361
	Home equity line	5,963				5,963				95				6,206
	Credit card	1,763				1,763				106				1,975
	Residential mortgages	13,876				13,967				1,599				13,946
Subtotal		72,097				78,762				8,444				73,943
	Total impaired loans	$	108,378			$	134,017			$	8,444			$	124,814
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represents 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 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.
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. As of September 30, 2013 and December 31, 2012, $8.8 million and $7.7 million, respectively, in consumer loans were identified as TDRs whereby the borrower's obligation to the Corporation has been discharged in bankruptcy and the borrower has not reaffirmed the debt. 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 September 30, 2013, December 31, 2012 and September 30, 2012.
				As of September 30, 2013
				Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I		35			$	5,455			$	9,533
		CRE		49			15,508				19,848
		Construction		31			958				1,237
		Total originated commercial		115			21,921				30,618
	Consumer
		Installment		1,655			28,578				29,960
		Home equity lines		240			6,916				7,255
		Credit card		339			1,253				1,253
		Residential mortgages		292			23,065				25,683
		Total originated consumer		2,526			59,812				64,151
Total originated loans				2,641			$	81,733			$	94,769
Acquired Loans
	Commercial
		C&I		1			6				6
		Total acquired commercial		1			6				6
	Consumer
		Home equity lines		3			260				307
		Total acquired consumer		3			260				307
Total acquired loans				4			266				313
Covered loans
	Commercial
		C&I		4			$	1,537			$	2,377
		CRE		24			43,024				58,252
		Construction		10			4,040				23,796
		Total covered commercial		38			48,601				84,425
	Consumer
		Home equity lines		48			5,753				5,777
		Residential mortgages		1			$	152			$	151
		Total covered consumer		49			5,905				5,928
Total covered loans				87			$	54,506			$	90,353
Total loans
	Commercial
		C&I		40			$	6,998			$	11,916
		CRE		73			58,532				78,100
		Construction		41			4,998				25,033
		Total commercial		154			70,528				115,049
	Consumer
		Installment		1,655			28,578				29,960
		Home equity lines		291			12,929				13,339
		Credit card		339			1,253				1,253
		Residential mortgages		293			23,217				25,834
		Total consumer		2,578			65,977				70,386
Total loans				2,732			$	136,505			$	185,435
Note 1: The differences between the recorded investment and unpaid principal balance amounts represents 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 represents partial charge offs.
				As of September 30, 2012
				Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I		22			$	2,413			$	8,478
		CRE		36			17,763				21,307
		Construction		27			3,577				4,025
		Total originated commercial		85			23,753				33,810
	Consumer
		Installment		1,840			32,577				34,414
		Home equity lines		229			6,922				7,202
		Credit card		426			1,767				1,767
		Residential mortgages		308			24,569				26,805
		Total originated consumer		2,803			65,835				70,188
Total originated loans				2,888			$	89,588			$	103,998
Covered loans
	Commercial
		C&I		11			$	5,278			$	6,216
		CRE		25			52,079				57,681
		Construction		10			14,640				42,567
		Total covered commercial		46			71,997				106,464
	Consumer
		Home equity lines		30			4,742				4,774
Total covered loans				76			$	76,739			$	111,238
Total loans
	Commercial
		C&I		33			$	7,691			$	14,694
		CRE		61			69,843				78,988
		Construction		37			18,216				46,592
		Total commercial		131			95,750				140,274
	Consumer
		Installment		1,840			32,577				34,414
		Home equity lines		259			11,664				11,976
		Credit card		426			1,767				1,767
		Residential mortgages		308			24,569				26,805
		Total consumer		2,833			70,577				74,962
Total loans				2,964			$	166,327			$	215,236
Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.
The pre-modification and post-modification outstanding recorded investments of loans modified as TDRs during the three months ended September 30, 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 three months ended September 30, 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 three months ended September 30, 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 September 30, 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 September 30, 2013, December 31, 2012 and September 30, 2012, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
As of September 30, 2013
	Accruing TDRs												Nonaccruing TDRs												Total				Total
	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	3,249			$	180			$	3,429			$	395			$	1,631			$	2,026			$	5,455			$	736
CRE	10,333				347				10,680				1,976				2,852				4,828				15,508				294
Construction	895				—				895				63				—				63				958				—
Total originated commercial	14,477				527				15,004				2,434				4,483				6,917				21,921				1,030
Consumer
Installment	24,194				1,261				25,455				2,803				320				3,123				28,578				552
Home equity lines	5,544				112				5,656				1,260				—				1,260				6,916				197
Credit card	1,134				117				1,251				—				2				2				1,253				261
Residential mortgages	12,566				3,094				15,660				4,046				3,359				7,405				23,065				1,302
Total originated consumer	43,438				4,584				48,022				8,109				3,681				11,790				59,812				2,312
Total originated TDRs	$	57,915			$	5,111			$	63,026			$	10,543			$	8,164			$	18,707			$	81,733			$	3,342
Acquired loans
Commercial
C&I	—				—				—				—				6				6				6				—
Total acquired commercial	—				—				—				—				6				6				6				—
Consumer
Home equity lines	196				—				196				—				64				64				260				—
Total acquired consumer	196				—				196				—				64				64				260				—
Total acquired TDRs	$	196			$	—			$	196			$	—			$	70			$	70			$	266			$	—
Covered loans
Commercial
C&I	$	795			$	742			$	1,537			$	—			$	—			$	—			$	1,537			$	446
CRE	5,479				37,545				43,024				—				—				—				43,024				2,832
Construction	925				3,115				4,040				—				—				—				4,040				1,001
Total covered commercial	7,199				41,402				48,601				—				—				—				48,601				4,279
Consumer
Home equity lines	5,256				497				5,753				—				—				—				5,753				—
Residential mortgages	152				—				152				—				—				—				152				—
Total covered consumer	5,408				497				5,905				—				—				—				5,905				—
Total covered TDRs	$	12,607			$	41,899			$	54,506			$	—			$	—			$	—			$	54,506			$	4,279
Total loans
Commercial
C&I	$	4,044			$	922			$	4,966			$	395			$	1,637			$	2,032			$	6,998			$	1,182
CRE	15,812				37,892				53,704				1,976				2,852				4,828				58,532				3,126
Construction	1,820				3,115				4,935				63				—				63				4,998				1,001
Total commercial	21,676				41,929				63,605				2,434				4,489				6,923				70,528				5,309
Consumer
Installment	24,194				1,261				25,455				2,803				320				3,123				28,578				552
Home equity lines	10,996				609				11,605				1,260				64				1,324				12,929				197
Credit card	1,134				117				1,251				—				2				2				1,253				261
Residential mortgages	12,718				3,094				15,812				4,046				3,359				7,405				23,217				1,302
Total consumer	49,042				5,081				54,123				8,109				3,745				11,854				65,977				2,312
Total TDRs	$	70,718			$	47,010			$	117,728			$	10,543			$	8,234			$	18,777			$	136,505			$	7,621
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 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
As of September 30, 2012
	Accruing TDRs												Nonaccruing TDRs												Total				Total
	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	955			$	—			$	955			$	865			$	593			$	1,458			$	2,413			$	126
CRE	11,609				2,464				14,073				473				3,217				3,690				17,763				401
Construction	3,507				—				3,507				70				—				70				3,577				117
Total originated commercial	16,071				2,464				18,535				1,408				3,810				5,218				23,753				644
Consumer
Installment	28,604				1,071				29,675				2,882				20				2,902				32,577				1,674
Home equity lines	5,394				171				5,565				1,131				226				1,357				6,922				95
Credit card	1,655				109				1,764				—				3				3				1,767				106
Residential mortgages	11,386				3,339				14,725				6,611				3,233				9,844				24,569				1,599
Total originated consumer	47,039				4,690				51,729				10,624				3,482				14,106				65,835				3,474
Total originated TDRs	$	63,110			$	7,154			$	70,264			$	12,032			$	7,292			$	19,324			$	89,588			$	4,118
Covered loans
Commercial
C&I	$	1,000			$	4,278			$	5,278			$	—			$	—			$	—			$	5,278			$	1,527
CRE	17,298				34,782				52,080				—				—				—				52,080				8,088
Construction	6,324				8,315				14,639				—				—				—				14,639				1,632
Total covered commercial	24,622				47,375				71,997				—				—				—				71,997				11,247
Consumer
Home equity lines	4,698				44				4,742				—				—				—				4,742				—
Total covered TDRs	$	29,320			$	47,419			$	76,739			$	—			$	—			$	—			$	76,739			$	11,247
Total loans
Commercial
C&I	$	1,955			$	4,278			$	6,233			$	865			$	593			$	1,458			$	7,691			$	1,653
CRE	28,907				37,246				66,153				473				3,217				3,690				69,843				8,489
Construction	9,831				8,315				18,146				70				—				70				18,216				1,749
Total commercial	40,693				49,839				90,532				1,408				3,810				5,218				95,750				11,891
Consumer
Installment	28,604				1,071				29,675				2,882				20				2,902				32,577				1,674
Home equity lines	10,092				215				10,307				1,131				226				1,357				11,664				95
Credit card	1,655				109				1,764				—				3				3				1,767				106
Residential mortgages	11,386				3,339				14,725				6,611				3,233				9,844				24,569				1,599
Total consumer	51,737				4,734				56,471				10,624				3,482				14,106				70,577				3,474
Total TDRs	$	92,430			$	54,573			$	147,003			$	12,032			$	7,292			$	19,324			$	166,327			$	15,365
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 three months ended September 30, 2013, as well as the recorded investment in these restructured loans as of September 30, 2013.
	As of September 30, 2013
	Number of Loans			Recorded Investment
Originated loans
Commercial
C&I	2			$	1,802
CRE	4			2,668
Construction	—			—
Total originated commercial	6			4,470
Consumer
Installment	127			1,964
Home equity lines	10			204
Credit card	7			43
Residential mortgages	—			—
Total originated consumer	144			$	2,211
Covered loans
Commercial
C&I	—			$	—
CRE	—			—
Construction	—			—
Total covered commercial	—			$	—
Total loans
Commercial
C&I	2			$	1,802
CRE	4			2,668
Construction	—			—
Total commercial	6			4,470
Consumer
Installment	127			1,964
Home equity lines	10			204
Credit card	7			43
Residential mortgages	—			—
Total consumer	144			2,211
Total	150			$	6,681

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill
	Goodwill totaled $734.9 million as of September 30, 2013, and $460.0 million as of December 31, 2012 and September 30, 2012. As discussed in Note 2 (Business Combinations), the Corporation recorded $274.8 million of provisional goodwill in the three months ended June 30, 2013 in connection with the acquisition of Citizens. As of September 30, 2013, the additional goodwill remains unallocated to the Corporation’s reporting units due to the provisional nature of the fair value measurements.
	Goodwill is not amortized but is evaluated for impairment on an annual basis at November 30 of each year or whenever events or changes in circumstances indicate the carrying value may not be recoverable. No events or circumstances since the November 30, 2012 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment exists.
	Other Intangible Assets
	The following tables show the gross carrying amount and the amount of accumulated amortization of intangible assets subject to amortization.
		September 30, 2013
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	87,533	$	(14,325	)	$	73,208
	Non-compete covenant	102		(96		)	6
	Lease intangible	618		(511		)	107
	Trust relationships	14,000		(1,874		)	12,126
		$	102,253	$	(16,806	)	$	85,447
		December 31, 2012
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	16,759		(10,546		)	6,213
	Non-compete covenant	102		(76		)	26
	Lease intangible	$	618	$	(484	)	$	134
		$	17,479	$	(11,106	)	$	6,373
		September 30, 2012
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	16,759	$	(10,117	)	$	6,642
	Non-compete covenant	102		(70		)	32
	Lease intangible	618		(475		)	143
		$	17,479	$	(10,662	)	$	6,817
	Core deposit intangibles comprise the majority of the intangible asset total as of September 30, 2013. As discussed in Note 2 (Business Combinations ), the Corporation recorded approximately $84.8 million of intangible assets in connection with its acquisition with 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 $3.0 million and $5.7 million in the three and nine months ended September 30, 2013, respectively, compared to $0.5 million and $1.4 million in the three and nine months ended September 30, 2012, respectively. Estimated amortization expense for each of the next five years is as follows: 2013 - $2.7 million; 2014 - $11.7 million; 2015 - $10.4 million; 2016 - $9.2 million; and 2017 - $8.2 million.

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2013
Shareholders' Equity [Abstract]	'
Stockholders' Equity Note Disclosure	'
	Shareholders' Equity
	Citizens Acquisition
	On April 12, 2013, the Corporation completed the acquisition of Citizens, which resulted in all of Citizens' common stock being converted into the right to receive 1.37 shares of the Corporation's Common Stock. The conversion of Citizens' common stock into the Corporation's Common Stock resulted in the Corporation issuing 55,468,283 shares of its common stock. 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 at an exercise price of $18.69. The warrant qualifies as Tier 1 capital and is exercisable in whole or in part since the execution date of April 12, 2013. The warrant has an expiration date of December 12, 2018. 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 Corporation calculates EPS using the two-class method. The two-class method allocates net income to each class of Common Stock and participating security according to the common dividends declared and participation rights in undistributed earnings. Participating securities consist of unvested stock-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. The Corporation also uses the treasury stock method to calculate dilutive EPS. The treasury stock method assumes that the Corporation uses the proceeds from a hypothetical exercise of options the warrant issued to the U.S. Treasury to repurchase Common Stock at the average market price during the period. Dilutive EPS is reported using the lessor of the the two-class method or the treasury stock method.
	The reconciliation between basic and diluted EPS using the two-class method and treasury stock method is presented as follows:
		Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
	Basic EPS:
	Net income	$	40,715	$	34,953	126,510		$	95,882
	Less:
	Cash dividends on 5.875% non-cumulative perpetual series A, preferred stock	1,469		—		3,868		—
	Income allocated to participating securities	309		156		1,098		87
	Net income attributable to common shareholders	$	38,937	$	34,797	$	121,544	$	95,795
	Average common shares outstanding	166,323		110,682		145,681		110,282
	Less: participating shares included in average shares outstanding	1,279		1,037		1,279		809
	Average common shares outstanding used in basic EPS	165,044		109,645		144,402		109,473
	Basic net income per share	$	0.24	$	0.32	$	0.84	$	0.88
	Diluted EPS:
	Net income attributable to common shareholders	$	38,937	$	34,797	$	121,544	$	95,795
	Add: Undistributed earnings allocated to unvested securities	105		176		485		342
	Less: Undistributed earnings reallocated participating securities	105		176		485		342
	Income used in diluted earnings per share calculation	$	38,937	$	34,797	$	121,544	$	95,795
	Average common shares outstanding	166,323		110,682		145,681		110,282
	Add: Common Stock equivalents:
	Warrant and stock plans	3,872		—		2,939		—
	Less: participating shares included in average shares outstanding	1,279		1,037		1,279		809
	Average common and Common Stock equivalent shares outstanding	168,916		109,645		147,341		109,473
	Diluted net income per share	$	0.23	$	0.32	$	0.82	$	0.88
	Potential common shares consist of employee stock options and the Common Stock warrant. These potential common shares 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. Antidilutive potential common shares for the three months ended September 30, 2012 totaled $1.8 million and $2.4 million and $1.8 million for the nine months ended September 30, 2013 and 2012.

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 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) to the 2012 Form 10-K. 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.
	The Corporation’s business is conducted solely in the United States of America. The following tables present a summary of financial results as of and for the three and nine months ended September 30, 2013 and September 30, 2012:
																								FirstMerit
			Commercial					Retail				Wealth						Other						Consolidated
	September 30, 2013		QTD			YTD		QTD		YTD		QTD			YTD			QTD			YTD			QTD		YTD
	OPERATIONS:
	Net interest income (loss)		$	106,443		$	277,468	$	99,548	$	239,922	$	3,613		$	11,162		$	(6,264	)	$	(15,835	)	$	203,340	$	512,717
	Provision for loan losses		(27		)	6,866		905		7,071		(736		)	(570		)	6,237			10,267			6,379		23,634
	Other income		21,364			60,980		30,723		88,916		13,216			34,347			5,787			13,680			71,090		197,923
	Other expenses		57,033			151,587		96,153		235,518		14,650			38,698			43,542			82,140			211,378		507,943
	Net income (loss)		46,021			116,997		21,589		56,061		1,894			4,796			(28,789		)	(51,344		)	40,715		126,510
	AVERAGES:
	Assets		8,685,333			8,020,824		5,659,553		4,646,817		266,028			255,538			9,402,680			7,709,479			24,013,594		20,632,658
																								FirstMerit
			Commercial					Retail				Wealth						Other						Consolidated
	September 30, 2012		QTD			YTD		QTD		YTD		QTD			YTD			QTD			YTD			QTD		YTD
	OPERATIONS:
	Net interest income (loss)		$	65,446		$	193,776	$	51,181	$	158,745	$	4,223		$	13,412		$	(2,960	)	$	(10,333	)	$	117,890	$	355,600
	Provision for loan losses		10,401			22,970		1,194		5,459		(519		)	(318		)	5,103			14,325			16,179		42,436
	Other income		15,247			47,603		26,783		76,226		8,528			24,987			4,367			13,136			54,925		161,952
	Other expenses		39,595			123,074		53,788		169,618		9,711			29,718			5,493			19,022			108,587		341,432
	Net income (loss)		19,954			61,967		14,939		38,931		2,313			5,849			(2,253		)	(10,865		)	34,953		95,882
	AVERAGES:
	Assets		6,466,355			6,386,617		2,960,336		2,929,911		242,539			238,899			5,064,786			5,041,099			14,734,016		14,596,526

Derivatives_Instruments_and_He

Derivatives Instruments and Hedging Activities Disclosure	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities Disclosure	'
	Derivatives and Hedging Activities
	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 September 30, 2013, December 31, 2012 and September 30, 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
		September 30, 2013						December 31, 2012							September 30, 2012					September 30, 2013				December 31, 2012				September 30, 2012
		Notional/ Contract Amount			Fair			Notional/ Contract Amount			Fair				Notional/ Contract Amount			Fair		Notional/ Contract Amount		Fair		Notional/ Contract Amount		Fair		Notional/ Contract Amount		Fair
					Value (a)						Value (a)							Value (a)				Value (b)				Value (b)				Value (b)
	Interest rate swaps:
	Fair value hedges	$	—		$	—		$	—		$	—			$	—		$	—	$	133,159	$	13,289	$	161,133	$	19,080	$	182,950	$	22,071
	(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 September 30, 2013, December 31, 2012 and September 30, 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
		September 30, 2013						December 31, 2012							September 30, 2012					September 30, 2013				December 31, 2012				September 30, 2012
		Notional/ Contract Amount			Fair Value(a)			Notional/ Contract Amount			Fair Value(a)				Notional/ Contract Amount			Fair Value(a)		Notional/ Contract Amount		Fair Value(b)		Notional/ Contract Amount		Fair Value(b)		Notional/ Contract Amount		Fair Value(b)
	Interest rate swaps	$	1,546,228		$	51,044		$	1,204,835		$	58,769			$	1,166,765		$	62,796	$	1,546,228	$	51,044	$	1,204,835	$	58,769	$	1,166,765	$	62,796
	Mortgage loan commitments	144,572			2,729			168,271			4,400				221,057			7,394		—		—		—		—		—		—
	Forward sales contracts	—			—			—			—				—			—		68,581		1,081		124,017		62		144,849		2,223
	Credit contracts	—			—			—			—				—			—		50,336		—		25,225		—		20,861		—
	Foreign exchange	5,716			66			6,662			62				4,363			80		6,295		92		6,026		57		4,371		71
	Other	—			—			—			—				—			—		54,763		—		31,492		—		27,898		—
	Total	$	1,696,516		$	53,839		$	1,379,768		$	63,231			$	1,392,185		$	70,270	$	1,726,203	$	52,217	$	1,391,595	$	58,888	$	1,364,744	$	65,090
	(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 September 30, 2013, the remaining terms on these swap participation agreements generally ranged from less than one year to six 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 $3.3 million as of September 30, 2013. The fair values of the written swap participations were not material at September 30, 2013, December 31, 2012 and September 30, 2012.
	Gains and losses recognized in income on non-designated hedging instruments for the three and nine months ended September 30, 2013 and 2012 are as follows:
	Derivatives not		Location of Gain/(Loss)	Amount of Gain / (Loss) Recognized in Income on Derivatives
	designated as hedging		Recognized
	instruments		in Income on	Three Months Ended September 30,						Nine Months Ended September 30,
			Derivative	2013			2012			2013				2012
	Mortgage loan commitments		Other operating income	$	1,950		$	2,146		$	(1,672	)		$	2,435
	Forward sales contracts		Other operating income	(5,538		)	(1,023		)	(1,019		)		(425		)
	Foreign exchange contracts		Other operating income	195			136			(118		)		196
	Other		Other operating expense	—			—			—				—
	Total			$	(3,393	)	$	1,259		$	(2,809	)		$	2,206
	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 $78.2 million, $96.5 million and $103.0 million as of September 30, 2013, December 31, 2012 and September 30, 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 September 30, 2013, December 31, 2012 and September 30, 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 September 30, 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 - non-designated	$	2,585		$	—		$	2,585		$	(2,585	)		$	—		$	—
	Foreign exchange	66			—			66			(92		)		26			—
	Total derivative assets	$	2,651		$	—		$	2,651		$	(2,677	)		$	26		$	—
	Derivative Liabilities
	Interest rate swaps - designated	$	13,289		$	—		$	13,289		$	—			$	(13,289	)	$	—
	Interest rate swaps - non-designated	48,458			—			48,458			(2,585		)		(45,873		)	—
	Foreign exchange	92			—			92			(92		)		—			—
	Total derivative liabilities	$	61,839		$	—		$	61,839		$	(2,677	)		$	(59,162	)	$	—
		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 - non-designated	$	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 - non-designated	58,714			—			58,714			(55		)		(58,659		)	—
Foreign exchange	45			—			45			(14		)		(31		)	—
Total derivative liabilities	$	77,839		$	—		$	77,839		$	(69	)		$	(77,770	)	$	—
	As of September 30, 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 - non-designated	$	63		$	—		$	63		$	(63	)		$	—		$	—
Foreign exchange	22			—			22			(22		)		—			—
Total derivative assets	$	85		$	—		$	85		$	(85	)		$	—		$	—
Derivative Liabilities
Interest rate swaps - designated	$	22,071		$	—		$	22,071		$	—			$	(22,071	)	$	—
Interest rate swaps - non-designated	62,733			—			62,733			(63		)		(62,670		)	—
Foreign exchange	56			—			56			(22		)		(34		)	—
Total derivative liabilities	$	84,860		$	—		$	84,860		$	(85	)		$	(84,775	)	$	—
(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.

Benefit_Plans

Benefit Plans	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Pension and Other Postretirement Benefits Disclosure	'
	Benefit Plans
	The Corporation sponsors several qualified and nonqualified pension and other postretirement plans for certain of its employees. The net periodic pension cost is based on estimated values provided by an outside actuary. The components of net periodic benefit cost are as follows:
		Pension Benefits
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Components of Net Periodic Pension Cost
	Service Cost	$	585		$	1,799		$	1,755		$	5,397
	Interest Cost	2,632			2,965			7,896			8,895
	Expected return on assets	(2,960		)	(3,034		)	(8,880		)	(9,102		)
	Amortization of unrecognized prior service costs	117			97			351			291
	Cumulative net loss	1,174			2,593			3,522			7,779
	Net periodic pension cost	$	1,548		$	4,420		$	4,644		$	13,260
		Postretirement Benefits
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Components of Net Periodic Postretirement Cost
	Service Cost	$	24		$	19		$	74		$	57
	Interest Cost	130			174			390			522
	Amortization of unrecognized prior service costs	(117		)	(117		)	(351		)	(351		)
	Cumulative net loss	67			72			201			216
	Net periodic postretirement cost	$	104		$	148		$	314		$	444
	Effective December 31, 2012, the qualified defined benefit 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, or for deferred vested participants, at the time they request and are eligible for their pension benefit.
	The Corporation also 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. The savings plan was approved for non-vested employees in the defined benefit pension plan and new hires as of January 1, 2007. Starting January 1, 2013, the employer's matching contribution to the savings plan increased to 100% on the first 3% and then 50% on the next 2% of the employee's qualifying salary. Matching contributions vest in accordance with plan specifications.
	Citizens Acquisition
	The Corporation is in the process of transitioning the legacy Citizens employees to the Corporation's benefit plans. Citizens defined benefit pension plan has been frozen since 2006 and remains frozen. Citizens also had an unfunded nonqualified supplemental benefit plan that provided retirement benefits to designated executive officers. Benefits that become payable under the nonqualified plan will be paid by the Corporation. Citizens had a postretirement benefit plan which provided postretirement health and dental care to full-time employees who retired with eligibility for coverage based on historical plan terms.
	Net periodic benefits and costs for the Citizens sponsored plans including the following components for the three and nine months ended September 30, 2013:
		Pension Benefits
		Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013
	Interest Cost	$	795		$	1,590
	Expected return on assets	(1,096		)	(2,192		)
	Net periodic pension benefit	$	(301	)	$	(602	)
		Postretirement Benefits
		Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013
	Interest Cost	$	15,770		$	31,540
	Net periodic postretirement cost	$	15,770		$	31,540
	Citizens sponsored an employee savings plan under Section 401(k) of the Internal Revenue Code that covered substantially all legacy Citizens employees. This plan continues to operate as before and will admit new participants if those participants meet the eligibility conditions and perform services at a legacy Citizen location. Contributions to the legacy Citizens 401(k) plan are matched 50% on the first 2% of salary deferred and 25% on the next 6% deferred.

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 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 as of September 30, 2013, December 31, 2012 and September 30, 2012:
					Fair Value by Hierarchy
		30-Sep-13			Level 1			Level 2			Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	3,096		$	3,096		$	—		$	—
	Non-marketable equity securities	3,281			—			10			3,271
	U.S. States and political subdivisions	272,224			—			272,224			—
	Residential mortgage-backed securities:
	U.S. government agencies	999,375			—			999,375			—
	Commercial mortgage-backed securities:
	U.S. government agencies	55,932			—			55,932			—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,505,706			—			1,505,706			—
	Non-agency	9			—			—			9
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	97,154			—			97,154			—
	Corporate debt securities	50,850			—			—			50,850
	Asset-backed securities:
	Collateralized loan obligations, non-agency issued	268,632			—			—			268,632
	Total available for sale securities	3,256,259			3,096			2,930,401			322,762
	Residential loans held for sale	17,813			—			17,813			—
	Derivative assets:
	Interest rate swaps - nondesignated	51,044			—			51,044			—
	Mortgage loan commitments	2,729			—			2,729			—
	Foreign exchange	66			—			66			—
	Total derivative assets	53,839			—			53,839			—
	Total fair value of assets (a)	$	3,327,911		$	3,096		$	3,002,053		$	322,762
	Derivative liabilities:
	Interest rate swaps - fair value hedges	$	13,289		$	—		$	13,289		$	—
	Interest rate swaps - nondesignated	51,044			—			51,044			—
	Forward sales contracts	1,081			—			1,081			—
	Foreign exchange	92			—			92			—
	Total derivative liabilities	65,506			—			65,506			—
	True-up liability	11,457			—			—			11,457
	Total fair value of liabilities (a)	$	76,963		$	—		$	65,506		$	11,457
	Nonrecurring fair value measurement
	Mortgage servicing rights (b)	$	22,616		$	—		$	—		$	22,616
	Impaired loans (c)	48,129			—			—			48,129
	Other property (d)	13,413			—			—			13,413
	Other real estate covered by loss share (e)	8,475			—			—			8,475
	Total fair value	$	92,633		$	—		$	—		$	92,633
	(a) - There were no transfers between levels 1 and 2 of the fair value hierarchy during the three months ended September 30, 2013.
	(b) - MSRs with a recorded investment of $22.9 million were reduced by a specific valuation allowance totaling $0.6 million to a reported carrying value of $22.4 million resulting in recognition of $0.1 million in recoveries included in loans sales and servicing income in the three months ended September 30, 2013.
	(c) - Collateral dependent impaired loans with a recorded investment of $51.3 million were reduced by specific valuation allowance allocations totaling $3.1 million to a reported net carrying value of $48.1 million.
	(d) - Amounts do not include assets held at cost at September 30, 2013. During the three months ended September 30, 2013, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.3 million included in noninterest expense.
(e) - Amounts do not include assets held at cost at September 30, 2013. During the three months ended September 30, 2013, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses $0.2 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			—
Non-agency	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 and 2 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 recognition of an impairment charge of $1.0 million 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 by Hierarchy
	30-Sep-12			Level 1			Level 2			Level 3
Recurring fair value measurement
Available-for-sale securities:
Marketable equity securities	$	3,245		$	3,245		$	—		$	—
U.S. government agency debentures	35,137			—			35,137			—
U.S. States and political subdivisions	258,418			—			258,418			—
Residential mortgage-backed securities:
U.S. government agencies	1,277,831			—			1,277,831			—
Commercial mortgage-backed securities:
U.S. government agencies	15,667			—			15,667			—
Residential collateralized mortgage-backed securities:
U.S. government agencies	1,205,525			—			1,205,525			—
Non-agency	12			—			1			11
Commercial collateralized mortgage-backed securities:
U.S. government agencies	68,665			—			68,665			—
Corporate debt securities	47,493			—			—			47,493
Total available-for-sale securities	2,911,993			3,245			2,861,244			47,504
Residential loans held for sale	17,540			—			17,540			—
Derivative assets:
Interest rate swaps - nondesignated	62,796			—			62,796			—
Mortgage loan commitments	7,394			—			7,394			—
Foreign exchange	80			—			80			—
Total derivative assets	70,270			—			70,270			—
Total fair value of assets (a)	$	2,999,803		$	3,245		$	2,949,054		$	47,504
Derivative liabilities:
Interest rate swaps - fair value hedges	22,071			—			22,071			—
Interest rate swaps - nondesignated	62,796			—			62,796			—
Forward sale contracts	2,223			—			2,223			—
Foreign exchange	71			—			71			—
Total derivative liabilities	87,161			—			87,161			—
True-up liability	12,642			—			—			12,642
Total fair value of liabilities (a)	$	99,803		$	—		$	87,161		$	12,642
Nonrecurring fair value measurement
Mortgage servicing rights (b)	$	17,294		$	—		$	—		$	17,294
Impaired loans (c)	44,010			—			—			44,010
Other property (d)	6,333			—			—			6,333
Other real estate covered by loss share (e)	14,695			—			—			14,695
Total fair value	$	82,332		$	—		$	—		$	82,332
(a) - There were no transfers between levels 1 and 2 of the fair value hierarchy during the three months ended September 30, 2012.
(b) - Mortgage servicing rights with a recorded investment of $21.3 million were reduced by a specific valuation allowance totaling $4.1 million to a reported carrying value of $17.2 million resulting in recognition of a recovery of $0.6 million in the three months ended September 30, 2012.
(c) - Collateral dependent impaired loans with a recorded investment of $52.5 million were reduced by specific valuation allowance allocations totaling $8.5 million to a reported net carrying value of $44.0 million.
(d) - Amounts do not include assets held at cost at September 30, 2012. During the three months ended September 30, 2012, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.1 million included in noninterest expense.
(e) - Amounts do not include assets held at cost at September 30, 2012. During the three months ended September 30, 2012, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.2 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 the three months ended September 30, 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 90% 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 September 30, 2013, less than 10% of the available-for-sale portfolio is Level 3, which consists of single issuer trust preferred securities and CLO.
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.
CLO 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 12 (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 non-economic 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 for the three months ended September 30, 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 sheets 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 3.59% and 2.99% as of September 30, 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 September 30, 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 $20 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 $7.3 million, $7.6 million and $7.7 million as of September 30, 2013, December 31, 2012 and September 30, 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 $4.2 million, $4.6 million and $5.0 million as of September 30, 2013, December 31, 2012 and September 30, 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 three and nine months ended September 30, 2013 and 2012 are summarized as follows:
	Three Months Ended September 30,											Nine Months Ended September 30,
	2013						2012					2013						2012
	Available-for-sale securities			True-up liability			Available-for-sale securities			True-up liability		Available-for-sale securities			True-up liability			Available-for-sale securities			True-up liability
Balance at beginning of period	$	212,512		$	10,937		$	48,096		$	11,820	$	49,661		$	12,259		$	87,539		$	11,551
Fair value of assets acquired	—			—								3,271			—			—			—
(Gains) losses included in earnings (a)	—			520			—			822		—			—			—			1,091
Unrealized gains (losses) (b)	(1,704		)				(605		)	—		(2,066		)	(802		)	3,137			—
Purchases	111,940			—			—			—		271,856			—			—			—
Sales	—			—			—			—		—			—			(40,520		)	—
Settlements	13			—			13			—		39			—			(2,652		)	—
Net transfers into (out of) Level 3	—			—			—			—		—			—			—			—
Balance at ending of period	$	322,761		$	11,457		$	47,504		$	12,642	$	322,761		$	11,457		$	47,504		$	12,642
(a) Reported in other 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 September 30, 2013, December 31, 2012 and September 30, 2012. The aggregate fair value, contractual balance and gain or loss on loans held for sale was as follows:
		September 30, 2013			December 31, 2012			September 30, 2012
Aggregate fair value carrying amount		$	17,813		$	23,683		$	17,540
Aggregate unpaid principal / contractual balance		17,179			22,765			16,635
Carrying amount over aggregate unpaid principal (a)		$	634		$	918		$	905
(a) These changes are included in loan sales and servicing income in the Consolidated Statements of Comprehensive 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 September 30, 2013, December 31, 2012 and September 30, 2012 are shown in the tables below.
	September 30, 2013
	Carrying			Fair Value
	Amount			Total			Level 1			Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	1,247,267		$	1,247,267		$	1,247,267		$	—	$	—
Available-for-sale securities	3,256,259			3,256,259			3,096			2,930,401		322,762
Held-to-maturity securities	2,749,934			2,658,433			—			2,658,433		—
Other securities	270,369			270,369			—			270,369		—
Loans held for sale	17,813			17,813			—			17,813		—
Net originated loans	9,690,848			9,623,848			—			—		9,623,848
Net acquired loans	3,825,751			3,825,751			—			—		3,825,751
Net covered loans and loss share receivable	608,732			608,732			—			—		608,732
Accrued interest receivable	49,820			49,820			—			49,820		—
Derivatives	53,839			53,839			—			53,839		—
Financial liabilities:
Deposits	$	19,489,533		$	19,508,531		$	—		$	19,508,531	$	—
Federal funds purchased and securities sold under agreements to repurchase	1,049,801			1,049,801			—			1,049,801		—
Wholesale borrowings	200,858			204,461			—			204,461		—
Long-term debt	324,425			321,255			—			321,255		—
Accrued interest payable	5,884			5,884			—			5,884		—
Derivatives	65,506			65,506			—			65,506		—
	December 31, 2012
	Carrying			Fair Value
	Amount			Total			Level 1			Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	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 originated 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		—
	September 30, 2012
	Carrying			Fair Value
	Amount			Total			Level 1			Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	238,417		$	238,417		$	238,417		$	—	$	—
Available for sale securities	2,911,993			2,911,993			3,245			2,861,244		47,504
Held to maturity securities	620,631			631,237			—			631,237		—
Other securities	140,730			140,730			—			140,730		—
Loans held for sale	17,540			17,540			—			17,540		—
Net originated loans	8,217,478			7,898,195			—			—		7,898,195
Net covered loans and loss share receivable	1,131,285			1,131,285			—			—		1,131,285
Accrued interest receivable	43,901			43,901			—			43,901		—
Derivatives	70,270			70,270			—			70,270		—
Financial liabilities:
Deposits	$	11,532,426		$	11,540,681		$	—		$	11,540,681	$	—
Federal funds purchased and securities sold under agreements to repurchase	963,455			963,455			—			963,455		—
Wholesale borrowings	178,083			187,230			—			187,230		—
Accrued interest payable	2,798			2,798			—			2,798		—
Derivatives	87,161			87,161			—			87,161		—
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 loans - Acquired loans were recorded at the preliminary estimated fair value on Acquisition Date. As of September 30, 2013, the carrying value of net acquired loans is considered a reasonable estimate of fair value due to the close proximity to the Acquisition Date and lack of significant changes in assumptions used to estimate the preliminary fair value as of the Acquisition Date such as expected prepayments and the amount and timing of expected principal, interest and other cash flows.
Net covered loans and loss share receivable – Fair values for 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 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.

Mortgage_Servicing_Rights_and_

Mortgage Servicing Rights and Mortgage Servicing Activity	9 Months Ended
	Sep. 30, 2013
Transfers and Servicing [Abstract]	'
Mortgage Servicing Rights and Mortgage Servicing Activity	'
	Mortgage Servicing Rights and Mortgage Servicing Activity
	In the nine months ended September 30, 2013 and 2012, the Corporation sold residential mortgage loans from the held for sale portfolio with unpaid principal balances of $468.8 million and $588.6 million, respectively, and recognized pretax gains of $10.8 million and $7.9 million, respectively, which are included as a component of loan sales and servicing income. As of September 30, 2013 and 2012, the Corporation retained the related mortgage servicing rights on $431.9 million and $560.9 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 September 30, 2013 and $2.4 billion at September 30, 2012. For the nine months ended September 30, 2013 and 2012, loan servicing fees, not including valuation changes included in loan sales and servicing income, were $4.7 million and $4.2 million, respectively.
	Servicing rights are presented within other assets on the accompanying consolidated balance sheets. 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 11 (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.
	In connection with the acquisition of Citizens, the Corporation recorded approximately $1.1 million of mortgage servicing rights on the Acquisition Date, which are included in the table below. Changes in the carrying amount of mortgage servicing rights and mortgage servicing rights valuation allowance are as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Balance at beginning of period	$	22,604		$	21,273		$	21,316		$	21,179
	Addition of Citizens' mortgage servicing rights on Acquisition Date	—			—			1,065			—
	Additions	1,450			1,408			4,151			4,597
	Amortization	(1,131		)	(1,390		)	(3,609		)	(4,485		)
	Balance at end of period	22,923			21,291			22,923			21,291
	Valuation allowance at beginning of period	(482		)	(3,488		)	(2,564		)	(3,539		)
	Recoveries (Additions)	(90		)	(590		)	1,992			(539		)
	Valuation allowance at end of period	(572		)	(4,078		)	(572		)	(4,078		)
	Mortgage servicing rights, net carrying balance	$	22,351		$	17,213		$	22,351		$	17,213
	Fair value at end of period	$	22,616		$	17,294		$	22,616		$	17,294
	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. No permanent impairment losses were written off against the allowance during the nine months ended September 30, 2013 and 2012.
	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 September 30, 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)	10.56		%
	Decrease in fair value from 10% adverse change	$	750
	Decrease in fair value from 25% adverse change	$	1,456
	Discount rate assumption	9.86		%
	Decrease in fair value from 100 basis point adverse change	$	704
	Decrease in fair value from 200 basis point adverse change	$	1,362
	Expected weighted-average life (in months)	98

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Contingencies and Guarantees	'
	Contingencies and Guarantees
	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. That application is now pending.
	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.
	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 9 (Derivatives and Hedging Activities). 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 September 30, 2013, December 31, 2012 and September 30, 2012 was $8.5 million, $5.4 million and $5.8 million, respectively. Additional information pertaining to this allowance is included in Note 5 (Allowance for Loan and Lease Losses) and under the heading "Allowance for Loan Losses and Reserve for Unfunded Lending Commitments" within Management's Discussion and Analysis of Financial Condition and Results of Operation of this report.
	The following table shows the remaining contractual amount of each class of commitments to extend credit as of September 30, 2013, December 31, 2012 and September 30, 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.
			September 30, 2013			December 31, 2012			September 30, 2012
	Loan Commitments
		Commercial	$	3,521,227		$	2,431,023		$	2,406,226
		Consumer	2,057,115			1,720,518			1,687,955
		Total loan commitments	$	5,578,342		$	4,151,541		$	4,094,181
	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 September 30, 2013, December 31, 2012 and September 30, 2012.
			September 30, 2013			December 31, 2012			September 30, 2012
	Financial guarantees
		Standby letters of credit	$	221,229		$	136,202		$	125,791
		Loans sold with recourse	50,882			42,383			39,251
		Total financial guarantees	$	272,111		$	178,585		$	165,042
	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 $112.6 million at September 30, 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 September 30, 2013, December 31, 2012 and September 30, 2012, the Corporation had sold $41.4 million, $32.5 million and $28.5 million, respectively, of outstanding residential mortgage loans to GSEs and other investors with recourse provisions. The Corporation had reserved $7.9 million, $1.5 million and $1.1 million as of September 30, 2013, December 31, 2012 and September 30, 2012, respectively, for potential losses from representation and warranty obligations and early payment default recourse provisions.
	Due to prior acquisitions, as of September 30, 2013, the Corporation continued to service approximately $8.2 million in manufactured housing loans that were sold with recourse compared to $8.2 million and $10.7 million as of December 31, 2012 and September 30, 2012, respectively. As of September 30, 2013, the Corporation had reserved $1.1 million for potential losses from these manufactured housing loans compared to $1.2 million and $1.2 million as of December 31, 2012 and September 30, 2012, respectively.
	The total reserve associated with loans sold with recourse was approximately $9.0 million, $2.7 million and $2.3 million as of September 30, 2013, December 31, 2012 and September 30, 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 in the three months ended June 30, 2013 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 three and nine months ended September 30, 2013 and 2012 are as follows:
		Three Months Ended September 30, 2013
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchase reserve
	Balance at beginning of period	$	7,287		$	1,106		$	8,393
	Assumed obligation	—			—			—
	Net realized losses	(1,983		)	—			(1,983		)
	Net increase (decrease) to reserve	2,546			3			2,549
	Balance at end of period	$	7,850		$	1,109		$	8,959
		Three Months Ended September 30, 2012
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	750		$	1,263		$	2,013
	Net realized losses	(202		)	—			(202		)
	Net increase (decrease) to reserve	552			(70		)	482
	Balance at end of period	$	1,100		$	1,193		$	2,293
		Nine Months Ended September 30, 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	(3,053		)	—			(3,053		)
	Net increase (decrease) to reserve	3,403			(58		)	3,345
	Balance at end of period	$	7,850		$	1,109		$	8,959
		Nine Months Ended September 30, 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	(569		)	—			(569		)
	Net increase (decrease) to reserve	1,199			(80		)	1,119
	Balance at end of period	$	1,100		$	1,193		$	2,293

Changes_and_Reclassifications_

Changes and Reclassifications Out of Accumulated Other Comprehensive Income (Notes)	9 Months Ended
	Sep. 30, 2013
Changes and Reclassifications Out of Other Comprehensive Income [Abstract]	'
Disclosure of Reclassification Amount	'
	14.     Changes and Reclassifications Out of Accumulated Other Comprehensive Income
	The following table presents the changes in AOCI by component of comprehensive income for the three and nine months ended September 30, 2013:
		Three Months Ended September 30, 2013									Nine Months Ended September 30, 2013
		Unrealized securities gains and losses			Pension and post- retirement costs			Total			Unrealized securities gains and losses			Pension and post- retirement costs			Total
	Balance at the beginning of the period	$	(274	)	$	(71,623	)	$	(71,897	)	$	55,418		$	(71,623	)	$	(16,205	)
	Amounts recognized in other comprehensive income, net of taxes of $26.7 million and $31.0 million	(11,716		)	—			(11,716		)	(69,229		)	—			(69,229		)
	Reclassified amounts out of accumulated other comprehensive income, net of tax of $0.978 million and $0.981 million	—			—			—			1,821			—			1,821
	Balance at the end of the period	$	(11,990	)	$	(71,623	)	$	(83,613	)	$	(11,990	)	$	(71,623	)	$	(83,613	)
	The following table presents current period reclassifications out of AOCI by component of comprehensive income for the three and nine months ended September 30, 2013:
		Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013			Income statement line item presentation
	Realized (gains) losses on sale of securities	$	—		$	2,802		Investment securities losses (gains), net
	Tax expense (benefit) (35%)	—			(981		)	Income tax expense (benefit)
	Reclassified amount, net of tax	$	—		$	1,821

Subsequent_Events_unaudited

Subsequent Events (unaudited)	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events (unaudited)	'
	15.     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)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Accounting Policies [Abstract]	'	'
New Accounting Pronouncements and Changes in Accounting Principles	'	'
		Recently Adopted and Issued Accounting Standards
		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, 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. There is no impact to the Corporation's consolidated financial statements as the Corporation does not have an unrecognized tax benefit.
		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 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 14 (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 2013-11, 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 9 (Derivatives and Hedging Activities).
Consolidation, Variable Interest Entity, Policy	'	'
	As discussed in Note 2 (Business Combinations), on April 12, 2013 (the "Acquisition Date"), the Corporation completed the merger with Citizens, a Michigan corporation. As part of the merger with Citizens, the Corporation now has two active wholly owned trusts that were formed for the purpose of issuing securities and qualify as regulatory capital. Accordingly, the Corporation made a determination as to whether it should consolidate other entities or account for them on the equity method of accounting depending on whether it has a controlling financial interest in an entity of less than 100% of the voting interest of that entity to determine if it is a VIE. A VIE is a corporation, partnership, trust or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. An entity that holds a variable interest in a VIE is required to consolidate the VIE if the entity is subject to a majority of the risk of loss from the VIE's activities, is entitled to receive a majority of the entity's residual returns or both. VIE treatment is considered for entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make financial and operating decisions.
	The two active wholly owned trusts acquired from the merger with Citizens are considered VIEs primarily due to the fact that the Corporation is not the primary beneficiary, and consequently, the trusts are not consolidated in the consolidated financial statements. 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 $25.8 million in aggregate liquidation amount outstanding, respectively, as of September 30, 2013. The gross proceeds from the issuances were used to purchase junior subordinated deferrable interest debentures issued by Citizens, now 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 qualify as Tier 1 capital and are classified as “long-term debt” on the Consolidated Balance Sheets, with the associated interest expense recorded in “long-term debt” on the Consolidated Statements of Comprehensive Income. The expected losses and residual returns of these entities are absorbed by the trust preferred stock holders, and consequently the Corporation is not exposed to loss related to these VIEs.

Investment_Securities_Investme

Investment Securities Investment policy on municipal security concentration (Policies)	Sep. 30, 2013
Investment policy on municipal securities [Abstract]	'
investment policy on municipal securities	'
	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%.

Business_Combinations_Tables

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	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 and are subject to refinement for up to one year after the Acquisition Date based on additional information obtained by Management that existed as of the Acquisition Date.
	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		3,202,577
	Loans		4,624,293
	Premises and equipment		138,536
	Intangible assets		84,774		1
	Accrued interest receivable and other assets		678,639
	Total assets		$	9,273,199
	LIABILITIES
	Deposits		$	7,276,754
	Borrowings		908,824
	Accrued taxes, expenses, and other liabilities		78,816
	Total liabilities		$	8,264,394
	Net identifiable assets acquired					1,008,805
	Goodwill					$	274,838
	1 - Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful life for which the core deposit intangible and the trust relationships are being amortized over is 15 years and 12 years, respectively.
Business Acquisition, Pro Forma Information	'
	The following table provides the unaudited pro forma information for the results of operations for the three and nine months ended September 30, 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 $69.1 million in merger 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.
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Total revenue, net of interest expense	$	342,756		$	325,086		$	959,045		$	949,884
	Net income	66,237			89,193			221,468			528,691
	Note: 2012 net income includes approximately $276.8 million of tax benefits as a result of Citizens restoration of its DTA.
Acquired Impaired and Non-Impaired Loans at Acquisition Date	'
	The provisional fair value of loans at the Acquisition Date are presented in the following table:
		Acquired Impaired			Acquired Non-impaired			Acquired Loans Total
	Commercial
	C&I	$	95,188		$	1,664,912		$	1,760,100
	CRE	380,039			359,066			739,105
	Construction	13,399			17,135			30,534
	Total commercial	488,626			2,041,113			2,529,739
	Consumer
	Residential mortgages	233,007			279,736			512,743
	Installment	54,377			1,165,235			1,219,612
	Home equity lines	48,598			313,601			362,199
	Total consumer	335,982			1,758,572			2,094,554
	Total	$	824,608		$	3,799,685		$	4,624,293
	The following table presents the provisional fair value of loans acquired from Citizens as of the Acquisition Date:
		Acquired Impaired			Acquired Non-Impaired			Acquired Loans Total
	Commercial
	C&I	$	95,188		$	1,664,912		$	1,760,100
	CRE	380,039			359,066			739,105
	Construction	13,399			17,135			30,534
	Total commercial	488,626			2,041,113			2,529,739
	Consumer
	Residential mortgages	233,007			279,736			512,743
	Installment	54,377			1,165,235			1,219,612
	Home equity lines	48,598			313,601			362,199
	Total consumer	335,982			1,758,572			2,094,554
	Total	$	824,608		$	3,799,685		$	4,624,293
Reconciliation of Carrying Amount of Acquired Loans	'
	A reconciliation of the contractual required payments receivable to the carrying amount of acquired loans at the Acquisition Date is as follows:
		Acquired Impaired			Acquired Non-impaired			Acquired Loans Total
	Contractual required payments receivable	$	1,086,503		$	4,020,812		$	5,107,315
	Nonaccretable difference	(130,096		)	—			(130,096		)
	Expected cash flows	956,407			4,020,812			4,977,219
	Accretable yield	(131,799		)	(221,127		)	(352,926		)
	Carrying balance	$	824,608		$	3,799,685		$	4,624,293

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 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 OCI in shareholders' equity.
			September 30, 2013
			Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. states and political subdivisions	$	267,470			$	8,249			$	(3,495	)		$	272,224
		Residential mortgage-backed securities:
		U.S. government agencies	983,255				26,155				(10,035		)		999,375
		Commercial mortgage-backed securities:
		U.S. government agencies	58,129				23				(2,220		)		55,932
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,538,991				5,710				(38,995		)		1,505,706
		Non-agency	9				—				—				9
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	98,440				404				(1,690		)		97,154
		Asset-backed securities:
		Collateralized loan obligations	271,856				71				(3,295		)		268,632
		Corporate debt securities	61,582				—				(10,732		)		50,850
		Total debt securities	3,279,732				40,612				(70,462		)		3,249,882
	Equity Securities
		Marketable equity securities	3,096				—				—				3,096
		Non-marketable equity securities	3,281				—				—				3,281
		Total equity securities	6,377				—				—				6,377
		Total securities available for sale	$	3,286,109			$	40,612			$	(70,462	)		$	3,256,259
	Securities held-to-maturity
	Debt securities
		U.S. treasuries	$	5,000			$	5			$	—			$	5,005
		U.S. government agency debentures	25,000				—				(1,136		)		23,864
		U.S. states and political subdivisions	453,230				5,093				(9,257		)		449,066
		Residential mortgage-backed securities:
		U.S. government agencies	377,980				1,068				(8,578		)		370,470
		Commercial mortgage-backed securities:
		U.S. government agencies	50,179				12				(1,025		)		49,166
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,523,792				179				(68,719		)		1,455,252
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	220,410				—				(8,936		)		211,474
		Corporate debt securities	94,343				294				(501		)		94,136
		Total securities held to maturity	$	2,749,934			$	6,651			$	(98,152	)		$	2,658,433
			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
		Non-agency	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
		September 30, 2012
		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
		Cost												Value
Securities available-for-sale
Debt securities
	U.S. government agency debentures	$	35,109			$	28			$	—			$	35,137
	U.S. states and political subdivisions	241,436				17,003				(21		)		258,418
	Residential mortgage-backed securities:
	U.S. government agencies	1,216,671				61,160				—				1,277,831
	Commercial mortgage-backed securities:
	U.S. government agencies	15,434				233				—				15,667
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,188,072				17,836				(383		)		1,205,525
	Non-agency	12				—				—				12
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	66,316				2,349				—				68,665
	Corporate debt securities	61,527				—				(14,034		)		47,493
	Total debt securities	2,824,577				98,609				(14,438		)		2,908,748
	Marketable equity securities	3,245				—				—				3,245
	Total securities available for sale	$	2,827,822			$	98,609			$	(14,438	)		$	2,911,993
Securities held-to-maturity
Debt securities
	U.S. states and political subdivisions	$	262,091			$	6,946			$	(17	)		$	269,020
	Commercial mortgage-backed securities:
	U.S. government agencies	33,149				792				—				33,941
	Residential Collateralized mortgage-backed securities:
	U.S. Government Agencies	129,265				396				—				129,661
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	98,961				1,054				—				100,015
	Corporate Debt Securities	97,165				1,435				—				98,600
	Total securities held to maturity	$	620,631			$	10,623			$	(17	)		$	631,237
Other investments	'
	FRB and FHLB stock constitute the majority of other investments on the consolidated balance sheets.
		30-Sep-13				31-Dec-12				30-Sep-12
	FRB stock	$	55,294			$	21,045			$	21,045
	FHLB stock	214,586				119,145				119,145
	Other	489				527				540
	Total other investments	$	270,369			$	140,717			$	140,730
Proceeds and gross unrealized gains and losses on sales of available-for-sale securities	'
	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.
		Three Months Ended September 30,								Nine Months Ended September 30,
		2013				2012				2013				2012
	Proceeds	$	—			$	29,735			$	2,180,624			$	190,813
	Realized gains	$	—			$	553			$	3,786			$	1,361
	Realized losses	—				—				(6,589		)		—
	Net securities (losses)/gains	$	—			$	553			$	(2,803	)		$	1,361
Gross unrealized losses and fair value of securities	'
	The following table presents the gross unrealized losses and fair value of securities by length of time that individual securities had been in a continuous loss position by major categories of available-for-sale and held-to-maturity securities.
				September 30, 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		$	57,258			$	(3,495	)		100			$	—		$	—		—			$	57,258			$	(3,495	)
		Residential mortgage-backed securities:
		U.S. government agencies		309,239				(10,035		)		23			—			—			—			309,239				(10,035		)
		Commercial mortgage-backed securities:
		U.S. government agencies		50,823				(2,220		)		7			—			—			—			50,823				(2,220		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies		1,073,105				(38,995		)		69			—			—			—			1,073,105				(38,995		)
		Commercial collateralized mortgage-backed securities:
		U.S. Government agencies		38,938				(1,690		)		5			—			—			—			38,938				(1,690		)
		Collateralized loan obligations:
		Non-agency		165,359				(3,295		)		26			—			—			—			165,359				(3,295		)
		Corporate debt securities		—				—				—			50,850			(10,732		)	8			50,850				(10,732		)
		Total available-for-sale securities		$	1,694,722			$	(59,730	)		230			$	50,850		$	(10,732	)	8			$	1,745,572			$	(70,462	)
	Securities held-to-maturity
	Debt securities
		U.S. government agency debentures		$	23,864			$	(1,136	)		1			$	—		$	—		—			$	23,864			$	(1,136	)
		U.S. states and political subdivisions		226,853				(9,243		)		362			987			(14		)	1			227,840				(9,257		)
		Residential mortgage-backed securities:
		U.S. government agencies		252,007				(8,578		)		13			—			—			—			252,007				(8,578		)
		Commercial mortgage-backed securities:
		U.S. government agencies		44,168				(1,025		)		7			—			—			—			44,168				(1,025		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies		1,416,238				(68,719		)		64			—			—			—			1,416,238				(68,719		)
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies		191,402				(8,936		)		18			—			—			—			191,402				(8,936		)
		Corporate debt securities		66,774				(501		)		24			—			—			—			66,774				(501		)
		Total held-to-maturity securities		$	2,221,306			$	(98,138	)		489			$	987		$	(14	)	1			$	2,222,293			$	(98,152	)
				December 31, 2012
				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		)
		Non-agency		—				—				—			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	)
				September 30, 2012
				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		$	3,560			$	(21	)		8			$	—		$	—		—			$	3,560			$	(21	)
	Residential mortgage-backed securities:
	U.S. government agencies		—				—				—			—			—			—			—				—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		121,427				(379		)		8			1,581			(4		)	1			123,008				(383		)
	Non-agency		—				—				—			—			—			—			—				—
	Corporate debt securities		—				—				—			47,493			(14,034		)	8			47,493				(14,034		)
	Total available-for-sale securities		$	124,987			$	(400	)		16			$	49,074		$	(14,038	)	9			$	174,061			$	(14,438	)
Securities held-to-maturity
Debt securities
	U.S. states and political subdivisions		$	2,360			$	(17	)		4			$	—		$	—		—			$	2,360			$	(17	)
	Commercial mortgage-backed securities:
	U.S. government agencies		—				—				—			—			—			—			—				—
	Commercial collateralized mortgage-backed securities:																						—				—
	U.S. government agencies		—				—				—			—			—			—			—				—
	Total held-to-maturity securities		$	2,360			$	(17	)		4			$	—		$	—		—			$	2,360			$	(17	)
Contractual maturities and contractual yields of debt securities held-to-maturity and available-for-sale	'
			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		$	—			$	—			$	14,460			$	3,649		$	17,085		$	7,125			$	1			$	—		$	13,568		$	—		$	55,888		3.51	%
	Over one year through five years		—				—				53,128				797,680			5,109			1,204,551				8				71,890			11,838			—			2,144,204			2.3	%
	Over five years through ten years		—				—				171,184				198,046			33,738			294,030				—				25,264			243,226			—			965,488			2.63	%
	Over ten years		—				—				33,452				—			—			—				—				—			—			50,850			84,302			2.18	%
	Fair Value		$	—			$	—			$	272,224			$	999,375		$	55,932		$	1,505,706			$	9			$	97,154		$	268,632		$	50,850		$	3,249,882		2.42	%
	Amortized Cost		$	—			$	—			$	267,470			$	983,255		$	58,129		$	1,538,991			$	9			$	98,440		$	271,856		$	61,582		$	3,279,732
	Weighted-Average Yield		—		%		—		%		5.23		%		2.78		%	2.1		%	1.85		%		3.68		%		1.8		%	2.14		%	0.97		%	2.42		%
	Weighted-Average Maturity		—				—				6.98				4.1			4.29			4.26				1.37				4.37			6.37			14.06			4.8
	Securities Held to Maturity
	Remaining maturity:
	One year or less		$	—			$	—			$	47,561			$	—		$	—		$	—			$	—			$	—		$	—		$	—		$	47,561		1.38	%
	Over one year through five years		—				5,005				47,157				137,350			15,120			1,088,688				—				97,014			—			74,487			1,464,821			1.66	%
	Over five years through ten years		23,864				—				152,100				233,120			34,046			366,564				—				114,460			—			19,649			943,803			2.21	%
	Over ten years		—				—				202,248				—			—			—				—				—			—			—			202,248			5.07	%
	Fair Value		$	23,864			$	5,005			$	449,066			$	370,470		$	49,166		$	1,455,252			$	—			$	211,474		$	—		$	94,136		$	2,658,433		2.11	%
	Amortized Cost		$	25,000			$	5,000			$	453,230			$	377,980		$	50,179		$	1,523,792			$	—			$	220,410		$	—		$	94,343		$	2,749,934
	Weighted-Average Yield		1.43		%		0.25		%		4.54		%		1.87		%	1.74		%	1.57		%		—		%		2.26		%	—		%	2.19		%	2.11		%
	Weighted-Average Maturity		6.08				1.33				11.24				5.81			5.81			4.6				—				5.41			—			4.29			5.68
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. As of September 30, 2013, the aggregate fair value of the Corporation's general obligation bonds was $0.6 million more than amortized cost. Additionally, the aggregate fair value of the Corporation's general obligation bonds was greater than $10.0 million in twelve of the thirty-eight 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.
		September 30, 2013
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Michigan	178			$	823			$	140,651			$	146,448
	Ohio	155			940				146,841				145,656
	Illinois	68			1,017				69,302				69,149
	Texas	69			774				54,428				53,427
	Wisconsin	83			637				51,981				52,856
	Pennsylvania	56			889				52,039				49,761
	Minnesota	46			658				30,115				30,278
	Washington	31			943				29,594				29,222
	New Jersey	38			726				27,130				27,604
	Missouri	20			978				19,303				19,552
	New York	22			590				13,082				12,970
	California	18			604				10,666				10,873
	Other	116			634				75,569				73,495
	Total general obligation bonds	900			$	801			$	720,701			$	721,291
		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				61,047				63,034
	Total general obligation bonds	546			$	994			$	522,699			$	542,653
		September 30, 2012
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Ohio	129			$	1,161			$	144,573			$	149,780
	Illinois	57			894				48,519				50,964
	Pennsylvania	53			961				49,384				50,925
	Texas	55			867				45,658				47,698
	Wisconsin	31			973				27,857				30,155
	New Jersey	39			735				26,794				28,646
	Minnesota	44			632				26,189				27,817
	Michigan	24			1,139				26,150				27,331
	Washington	23			809				17,505				18,598
	Missouri	15			1,025				14,241				15,378
	New York	18			583				9,980				10,497
	California	16			648				9,747				10,371
	Other	90			659				56,930				59,277
	Total general obligation bonds	594			$	888			$	503,527			$	527,437

Loans_Schedule_of_Accounts_Not

Loans Schedule of Accounts, Notes, Loans and Financing Receivables (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Acccounts, Notes, Loans and Financing Receivables [Abstract]	'
Schedule of Accounts, Notes, Loans and Financing Receivable	'
	Loans outstanding as of September 30, 2013, December 31, 2012 and September 30, 2012, net of unearned income, consisted of the following:
			September 30, 2013			December 31, 2012			September 30, 2012
	Originated loans (a):
	Commercial		$	6,420,369		$	5,866,489		$	5,511,678
	Residential mortgage		487,283			445,211			439,062
	Installment		1,647,095			1,328,258			1,321,081
	Home equity		889,372			806,078			789,743
	Credit cards		145,113			146,387			143,918
	Leases		199,907			139,236			110,938
		Total originated loans (a)	9,789,139			8,731,659			8,316,420
	Allowance for originated loan losses		(98,291		)	(98,942		)	(98,942		)
		Net originated loans	$	9,690,848		$	8,632,717		$	8,217,478
	Acquired loans:
	Commercial		$	1,971,062		$	—		$	—
	Residential mortgage		467,608			—			—
	Installment		1,080,298			—			—
	Home equity		306,783			—			—
		Total acquired loans	3,825,751			—			—
	Allowance for acquired loan losses		—			—			—
		Net acquired loans	$	3,825,751		$	—		$	—
	Covered loans:
	Commercial		422,225			718,437			847,741
	Residential mortgage		52,796			61,540			63,779
	Installment		6,361			8,189			8,360
	Home equity		102,908			117,225			123,178
	Indemnification asset		69,986			113,734			131,871
		Total covered loans	654,276			1,019,125			1,174,929
	Allowance for covered loan losses		(45,544		)	(43,255		)	(43,644		)
		Net covered loans	$	608,732		$	975,870		$	1,131,285
	Total loans:
	Commercial		$	8,813,656		$	6,584,926		$	6,359,419
	Residential mortgage		1,007,687			506,751			502,841
	Installment		2,733,754			1,336,447			1,329,441
	Home equity		1,299,063			923,303			912,921
	Credit cards		145,113			146,387			143,918
	Leases		199,907			139,236			110,938
	Indemnification asset		69,986			113,734			131,871
		Total loans	14,269,166			9,750,784			9,491,349
	Total allowance for loan losses		(143,835		)	(142,197		)	(142,586		)
		Total Net loans	$	14,125,331		$	9,608,587		$	9,348,763
	(a) Includes acquired FirstBank loans of $51.9 million, $54.2 million, and $56.0 million as of September 30, 2013, December 31, 2012 and September 30, 2012, respectively.

Loans_Changes_in_Loss_Share_Re

Loans Changes in Loss Share Receivable Associated with Covered Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Changes in Loss Share Receivable Associated with Covered Loans [Abstract]	'
Changes in Loss Share Receivable Associated with Covered Loans	'
	Changes in the loss share receivable associated with covered loans for the three and nine months ended September 30, 2013 and 2012 were as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Balance at beginning of period	$	83,910		$	152,615		$	113,734		$	205,664
	Accretion	(5,226		)	(8,401		)	(19,327		)	(26,935		)
	Increase due to impairment	1,032			1,484			8,890			12,601
	FDIC reimbursement	(7,284		)	(12,597		)	(23,231		)	(50,678		)
	Covered loans paid in full	(2,446		)	(1,229		)	(10,080		)	(8,780		)
	Balance at end of the period	$	69,986		$	131,872		$	69,986		$	131,872

Loans_Changes_in_Carrying_Amou

Loans Changes in Carrying Amounts of Accretable Yield for Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Changes in Carrying Amount of Accretable Yield for Loans [Abstract]	'
Changes in Carrying Amount of Accretable Yield for Purchased Loans	'
	Changes in the carrying amount and accretable yield for acquired impaired loans were as follows for the three months ended September 30, 2013:
	Acquired Impaired Loans	Three Months Ended September 30, 2013
		Accretable Yield			Carrying Amount of Loans
	Balance at beginning of period	$	118,459		$	757,029
	Additions	—			—
	Accretion	(8,827		)	8,827
	Net reclassifications from non-accretable to accretable	—			—
	Payments received, net	—			(92,536		)
	Disposals	(5,422		)	—
	Balance at end of period	$	104,210		$	673,320
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 three and nine months ended September 30, 2013 and 2012:
		Three Months Ended September 30,												Nine Months Ended September 30,
		2013						2012						2013						2012
	Covered Impaired Loans	Accretable			Carrying			Accretable			Carrying			Accretable			Carrying			Accretable			Carrying
		Yield			Amount of			Yield			Amount of			Yield			Amount of			Yield			Amount of
					Loans						Loans						Loans						Loans
	Balance at beginning of period	$	81,758		$	537,257		$	147,576		$	964,314		$	113,288		$	762,386		$	176,736		$	1,128,978
	Accretion	(14,056		)	14,056			(23,631		)	23,631			(51,327		)	51,327			(75,478		)	75,478
	Net reclassifications from non-accretable to accretable	12,745			—			6,008			—			28,726			—			30,814			—
	Payments received, net	—			(103,514		)	—			(96,593		)	—			(365,914		)	—			(313,104		)
	Disposals	(1,309		)	—			(1,929		)	—			(11,549		)	—			(4,048		)	—
	Balance at end of period	$	79,138		$	447,799		$	128,024		$	891,352		$	79,138		$	447,799		$	128,024		$	891,352

Loans_Reconciliation_of_Carryi

Loans Reconciliation of Carrying Amounts of Acquired Impaired Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Reconciliation of Carrying Amount of Acquired Impaired Loans [Abstract]	'
Reconciliation of Carrying Amount of covered Loans	'
	A reconciliation of the contractual required payments receivable to the carrying amount of covered impaired loans as of September 30, 2013 and 2012 is as follows:
	Covered Impaired Loans	September 30, 2013			September 30, 2012
	Contractual required payments receivable	$	811,319		$	1,333,127
	Nonaccretable difference	(284,382		)	(313,751		)
	Expected cash flows	526,937			1,019,376
	Accretable yield	(79,138		)	(128,024		)
	Carrying balance	$	447,799		$	891,352
Reconciliation of Carrying Amount of Acquired Impaired Loans	'
	A reconciliation of the contractual required payments receivable to the carrying amount of the acquired impaired loans as of September 30, 2013 is as follows:
	Acquired Impaired Loans	September 30, 2013
	Contractual required payments receivable	$	907,626
	Nonaccretable difference	(130,096		)
	Expected cash flows	777,530
	Accretable yield	(104,210		)
	Carrying balance	$	673,320

Loans_Past_Due_Financing_Recei

Loans Past Due Financing Receivables (Tables)	9 Months Ended
	Sep. 30, 2013
Past Due Financing Receivables [Abstract]	'
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 September 30, 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	$	3,571	$	3,889	$	4,931	$	12,391	$	3,851,704	$	3,864,095	$	201	$	5,234
	CRE	2,794		1,414		8,976		13,184		2,214,228		2,227,412		1,047		13,821
	Construction	—		—		24		24		328,838		328,862		—		85
	Leases	726		—		—		726		199,181		199,907		—		—
	Consumer
	Installment	9,825		3,392		5,378		18,595		1,628,500		1,647,095		4,506		3,894
	Home Equity Lines	1,094		498		1,118		2,710		886,662		889,372		500		2,038
	Credit Cards	781		434		700		1,915		143,198		145,113		365		422
	Residential Mortgages	13,487		3,771		9,344		26,602		460,681		487,283		5,833		10,094
	Total	$	32,278	$	13,398	$	30,471	$	76,147	$	9,712,992	$	9,789,139	$	12,452	$	35,588
	Acquired Loans													≥ 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	$	5,379	$	331	$	3,239	$	8,949	$	974,271	$	983,220	$	—	$	5,301
	CRE	3,068		2,816		26,766		32,650		937,010		969,660		—		691
	Construction	—		—		—		—		18,182		18,182		—		—
	Consumer
	Installment	10,883		2,866		1,446		15,195		1,065,103		1,080,298		—		954
	Home Equity Lines	3,779		982		3,522		8,283		298,500		306,783		—		2,184
	Residential Mortgages	18,346		3,203		10,723		32,272		435,336		467,608		2,967		769
	Total	$	41,455	$	10,198	$	45,696	$	97,349	$	3,728,402	$	3,825,751	$	2,967	$	9,899
	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	$	3,729	$	730	$	12,493	$	16,952	$	66,287	$	83,239	n/a		n/a
	CRE	1,299		5,672		117,839		124,810		184,087		308,897		n/a		n/a
	Construction	943		—		25,996		26,939		3,150		30,089		n/a		n/a
	Consumer
	Installment	57		4		—		61		6,300		6,361		n/a		n/a
	Home Equity Lines	1,532		22		1,781		3,335		99,574		102,909		n/a		n/a
	Residential Mortgages	8,333		661		5,966		14,960		37,835		52,795		n/a		n/a
	Total	$	15,893	$	7,089	$	164,075	$	187,057	$	397,233	$	584,290	n/a		n/a
	(a) Installment loans 90 days or more past due and accruing include $2.9 million of loans guaranteed by the U.S. government as of September 30, 2013.
	(b) Excludes loss share receivable of $70.0 million as of September 30, 2013.
	(c) Acquired and covered impaired loans were not classified as nonperforming assets at September 30, 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 and covered impaired loans. These asset quality disclosures are, therefore, not applicable to acquired and covered 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) Covered 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 covered impaired loans. These asset quality disclosures are, therefore, not applicable to covered impaired loans.
As of September 30, 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	$	8,781	$	2,795	$	1,519	$	13,095	$	3,036,136	$	3,049,231	$	57	$	9,995
CRE	3,197		3,856		16,876		23,929		2,129,413		2,153,342		1,862		20,574
Construction	116		—		853		969		308,136		309,105		—		923
Leases	7		—		—		7		110,931		110,938		—		—
Consumer
Installment	8,934		3,430		4,834		17,198		1,303,883		1,321,081		4,439		3,267
Home Equity Lines	1,840		472		1,411		3,723		786,020		789,743		541		1,858
Credit Cards	991		556		808		2,355		141,563		143,918		393		525
Residential Mortgages	14,427		2,777		6,233		23,437		415,625		439,062		2,399		13,169
Total	$	38,293	$	13,886	$	32,534	$	84,713	$	8,231,707	$	8,316,420	$	9,691	$	50,311
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	$	2,962	$	973	$	27,035	$	30,970	$	131,721	$	162,691	n/a		n/a
CRE	4,965		21,919		184,067		210,951		412,323		623,274		n/a		n/a
Construction	—		998		41,325		42,323		19,453		61,776		n/a		n/a
Consumer
Installment	2,289		—		35		2,324		6,036		8,360		n/a		n/a
Home Equity Lines	1,398		435		1,981		3,814		119,364		123,178		n/a		n/a
Residential Mortgages	10,382		1,248		8,576		20,206		43,573		63,779		n/a		n/a
Total	$	21,996	$	25,573	$	263,019	$	310,588	$	732,470	$	1,043,058	n/a		n/a
(a) Installment loans 90 days or more past due and accruing include $3.1 million of loans guaranteed by the U.S. government as of September 30, 2012.
(b) Excludes loss share receivable of $131.9 million as of September 30, 2012.
(c) Covered impaired loans were not classified as nonperforming assets at September 30, 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 covered impaired loans. These asset quality disclosures are, therefore, not applicable to covered impaired loans

Loans_Financing_Receivables_Cr

Loans Financing Receivables Credit Quality Indicators (Tables)	9 Months Ended
	Sep. 30, 2013
Financing Receivables Credit Quality Indicators [Abstract]	'
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 September 30, 2013
	Originated Loans	Commercial
		C&I		CRE		Construction		Leases
	Grade 1	$	32,144	$	1,216	$	—	$	9,932
	Grade 2	82,906		3,711		—		3,173
	Grade 3	867,186		368,918		27,041		29,631
	Grade 4	2,796,101		1,770,768		300,154		152,778
	Grade 5	48,912		30,502		323		3,325
	Grade 6	36,846		52,297		1,344		1,068
	Grade 7	—		—		—		—
	Total	$	3,864,095	$	2,227,412	$	328,862	$	199,907
	Acquired Loans	Commercial
		C&I		CRE		Construction		Leases
	Grade 1	$	—	$	—	$	—	$	—
	Grade 2	96		—		—		—
	Grade 3	27,827		29,123		—		—
	Grade 4	849,858		744,362		18,182		—
	Grade 5	60,968		102,256		—		—
	Grade 6	44,471		93,919		—		—
	Grade 7	—		—		—		—
	Total	$	983,220	$	969,660	$	18,182	$	—
	Covered Loans	Commercial
		C&I		CRE		Construction		Leases
	Grade 1	$	—	$	—	$	—	$	—
	Grade 2	996		—		—		—
	Grade 3	—		—		—		—
	Grade 4	45,557		116,056		601		—
	Grade 5	624		15,364		943		—
	Grade 6	33,957		176,286		26,401		—
	Grade 7	2,105		1,191		2,144		—
	Total	$	83,239	$	308,897	$	30,089	$	—
	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	—		—		—		—
	Grade 8	—		—		—		—
	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		—
	Grade 8	—		—		—		—
	Total	$	128,509	$	539,595	$	50,333	$	—
	As of September 30, 2012
	Originated Loans	Commercial
		C&I		CRE		Construction		Leases
	Grade 1	$	37,327	$	—	$	—	$	13,785
	Grade 2	105,504		3,170		—		190
	Grade 3	573,561		278,017		19,312		8,857
	Grade 4	2,215,336		1,738,257		282,438		87,259
	Grade 5	60,803		54,655		2,893		514
Grade 6	56,700		79,243		4,462		333
Grade 7	—		—		—		—
Grade 8	—		—		—		—
Total	$	3,049,231	$	2,153,342	$	309,105	$	110,938
Covered Loans	Commercial
	C&I		CRE		Construction		Leases
Grade 1	$	—	$	—	$	—	$	—
Grade 2	1,742		—		—		—
Grade 3	92		449		—		—
Grade 4	91,101		240,630		494		—
Grade 5	3,844		39,883		—		—
Grade 6	61,192		340,063		58,586		—
Grade 7	4,720		2,249		2,696		—
Total	$	162,691	$	623,274	$	61,776	$	—

Loans_Acquired_impaired_and_no

Loans Acquired impaired and non-impaired loans at acquisition date (Tables)	9 Months Ended
	Sep. 30, 2013
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date	'
	The provisional fair value of loans at the Acquisition Date are presented in the following table:
		Acquired Impaired		Acquired Non-impaired		Acquired Loans Total
	Commercial
	C&I	$	95,188	$	1,664,912	$	1,760,100
	CRE	380,039		359,066		739,105
	Construction	13,399		17,135		30,534
	Total commercial	488,626		2,041,113		2,529,739
	Consumer
	Residential mortgages	233,007		279,736		512,743
	Installment	54,377		1,165,235		1,219,612
	Home equity lines	48,598		313,601		362,199
	Total consumer	335,982		1,758,572		2,094,554
	Total	$	824,608	$	3,799,685	$	4,624,293
	The following table presents the provisional fair value of loans acquired from Citizens as of the Acquisition Date:
		Acquired Impaired		Acquired Non-Impaired		Acquired Loans Total
	Commercial
	C&I	$	95,188	$	1,664,912	$	1,760,100
	CRE	380,039		359,066		739,105
	Construction	13,399		17,135		30,534
	Total commercial	488,626		2,041,113		2,529,739
	Consumer
	Residential mortgages	233,007		279,736		512,743
	Installment	54,377		1,165,235		1,219,612
	Home equity lines	48,598		313,601		362,199
	Total consumer	335,982		1,758,572		2,094,554
	Total	$	824,608	$	3,799,685	$	4,624,293

Loans_Tables_Tables

Loans Tables (Tables)	9 Months Ended
	Sep. 30, 2013
Changes in Carrying Amount of Accretable Yield for Purchased Loans [Abstract]	'
Changes in Carrying Amount of Accretable Yield for Purchased Loans	'
	A reconciliation of the contractual required payments receivable to the carrying amount of acquired loans at the Acquisition Date is as follows:
		Acquired Impaired			Acquired Non-Impaired			Acquired Loans Total
	Contractual required payments receivable	$	1,086,503		$	4,020,812		$	5,107,315
	Nonaccretable difference	(130,096		)	—			(130,096		)
	Expected cash flows	956,407			4,020,812			4,977,219
	Accretable yield	(131,799		)	(221,127		)	(352,926		)
	Carrying balance	$	824,608		$	3,799,685		$	4,624,293

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]	'
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent	'
	The following tables show activity in the originated ALLL, by portfolio segment for the three and nine months ended September 30, 2013 and 2012, as well as the corresponding recorded investment in originated loans at the end of the period:
	As of September 30, 2013
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Three Months Ended
	Allowance for originated loan losses, beginning balance		$	45,167			$	16,823			$	2,044			$	909			$	8,725			$	13,266			$	7,288			$	4,423		$	98,645
	Charge-offs		(1,011		)		(211		)		—				—				(3,582		)		(1,843		)		(1,367		)		(501		)	(8,515		)
	Recoveries		1,162				168				394				11				2,624				802				438				39			5,638
	Provision for loan losses		(2,140		)		(1,632		)		267				99				2,710				662				1,147				1,410			2,523
	Allowance for originated loan losses, ending balance		$	43,178			$	15,148			$	2,705			$	1,019			$	10,477			$	12,887			$	7,506			$	5,371		$	98,291
	Nine Months 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		(5,114		)		(1,014		)		(516		)		(1,237		)		(11,788		)		(5,177		)		(4,229		)		(1,185		)	(30,260		)
	Recoveries		5,745				503				483				100				7,859				1,884				1,420				133			18,127
	Provision for loan losses		6,338				(4,467		)		(1,083		)		1,517				3,252				2,456				2,931				538			11,482
	Allowance for originated loan losses, ending balance		$	43,178			$	15,148			$	2,705			$	1,019			$	10,477			$	12,887			$	7,506			$	5,371		$	98,291
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	1,336			$	488			$	—			$	—			$	552			$	197			$	261			$	1,302		$	4,136
		Collectively evaluated for impairment	41,842				14,660				2,705				1,019				9,925				12,690				7,245				4,069			94,155
	Total ending allowance for originated loan losses balance		$	43,178			$	15,148			$	2,705			$	1,019			$	10,477			$	12,887			$	7,506			$	5,371		$	98,291
	Originated loans:
		Originated loans individually evaluated for impairment	$	7,476			$	19,755			$	958			$	—			$	30,608			$	6,787			$	1,253			$	23,064		$	89,901
		Originated loans collectively evaluated for impairment	3,856,619				2,207,657				327,904				199,907				1,616,487				882,585				143,860				464,219			9,699,238
	Total ending originated loan balance		$	3,864,095			$	2,227,412			$	328,862			$	199,907			$	1,647,095			$	889,372			$	145,113			$	487,283		$	9,789,139
	As of September 30, 2012
	Originated Loans		C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	Three Months Ended
	Allowance for originated loan losses, beginning balance		$	40,327			$	27,186			$	5,147			$	358			$	13,029			$	5,449			$	6,690			$	5,663		$	103,849
	Charge-offs		(8,773		)		(727		)		(127		)		—				(5,507		)		(2,784		)		(1,390		)		(1,691		)	(20,999		)
	Recoveries		1,408				180				61				—				2,883				1,007				488				100			6,127
	Provision for loan losses		6,197				(1,461		)		(277		)		148				1,430				1,213				1,447				1,268			9,965
	Allowance for originated loan losses, ending balance		$	39,159			$	25,178			$	4,804			$	506			$	11,835			$	4,885			$	7,235			$	5,340		$	98,942
	Nine Months 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		(19,906		)		(3,496		)		(165		)		—				(14,441		)		(7,373		)		(4,618		)		(3,431		)	(53,430		)
	Recoveries		3,120				825				364				38				9,104				2,588				1,583				191			17,813
	Provision for loan losses		23,582				(4,008		)		(568		)		127				(809		)		2,904				2,901				2,731			26,860
	Allowance for originated loan losses, ending balance		$	39,159			$	25,178			$	4,804			$	506			$	11,835			$	4,885			$	7,235			$	5,340		$	98,942
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	2,900			$	1,953			$	117			$	—			$	1,674			$	95			$	106			$	1,599		$	8,444
		Collectively evaluated for impairment	36,259				23,225				4,687				506				10,161				4,790				7,129				3,741			90,498
	Total ending allowance for originated loan losses balance		$	39,159			$	25,178			$	4,804			$	506			$	11,835			$	4,885			$	7,235			$	5,340		$	98,942
	Originated loans:
		Originated loans individually evaluated for impairment	$	9,994			$	28,972			$	3,577			$	—			$	32,577			$	6,922			$	1,767			$	24,569		$	108,378
		Originated loans collectively evaluated for impairment	3,039,235				2,124,370				305,528				110,938				1,288,505				782,820				142,152				414,494			8,208,042
	Total ending originated loan balance		$	3,049,229			$	2,153,342			$	309,105			$	110,938			$	1,321,082			$	789,742			$	143,919			$	439,063		$	8,316,420
	The following table presents the originated allowance for loan loss and the recorded investment as of December 31, 2012:
	As of December 31, 2012
		Originated Loans	C&I				CRE				Construction				Leases				Installment				Home Equity Lines				Credit Cards				Residential Mortgages			Total
	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:
		Loans individually evaluated for impairment	$	6,187			$	24,007			$	3,405			$	—			$	30,870			$	6,281			$	1,612			$	24,009		$	96,371
		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 for Financing Receivables, Current	'
	The following table presents activity in the covered allowance for loan loss for the three and nine months ended September 30, 2013 and 2012:
			Three Months Ended September 30,								Nine Months Ended September 30,
	Covered Allowance for Loan Losses		2013				2012				2013				2012
	Balance at beginning of the period		$	49,069			$	42,606			$	43,255			$	36,417
		Provision for loan losses before benefit attributable to FDIC loss share agreements	2,855				7,698				19,009				28,177
		Benefit attributable to FDIC loss share agreements	(1,032		)		(1,484		)		(8,890		)		(12,601		)
	Net provision for loan losses		1,823				6,214				10,119				15,576
	Increase in indemnification asset		1,032				1,484				8,890				12,601
	Loans charged-off		(6,380		)		(6,660		)		(16,720		)		(20,950		)
	Balance at end of the period		$	45,544			$	43,644			$	45,544			$	43,644
Impaired Financing Receivables	'
	Loan impairment for loans 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.
	As of September 30, 2013
	Originated Loans						Unpaid								Average
			Recorded				Principal				Related				Recorded
			Investment				Balance				Allowance				Investment
	Impaired loans with no related allowance
	Commercial
		C&I	$	3,826			$	7,887			$	—			$	11,842
		CRE	15,836				21,921				—				18,884
		Construction	958				1,237				—				1,851
	Consumer
		Installment	3,051				4,344				—				3,521
		Home equity line	1,046				1,386				—				1,107
		Credit card	48				48				—				74
		Residential mortgages	10,363				12,899				—				10,122
	Subtotal		35,128				49,722				—				47,401
	Impaired loans with a related allowance
	Commercial
		C&I	3,650				5,526				1,336				3,829
		CRE	3,920				4,251				488				4,126
		Construction	—				—				—				—
	Consumer
		Installment	25,528				25,616				552				26,172
		Home equity line	5,869				5,869				197				6,017
		Credit card	1,205				1,205				261				1,352
		Residential mortgages	12,702				12,784				1,302				11,866
	Subtotal		52,874				55,251				4,136				53,362
		Total impaired loans	$	88,002			$	104,973			$	4,136			$	100,763
	Note 1: These tables exclude loans fully charged off.
	Note 2: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.
	As of December 31, 2012
	Originated Loans						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 represents partial charge offs.
	As of September 30, 2012
	Originated Loans						Unpaid								Average
			Recorded				Principal				Related				Recorded
			Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	1,443			$	10,154			$	—			$	9,903
	CRE	16,910				22,337				—				19,217
	Construction	3,370				3,944				—				4,080
Consumer
	Installment	2,902				4,739				—				4,888
	Home equity line	959				1,239				—				1,237
	Credit card	4				4				—				4
	Residential mortgages	10,693				12,838				—				11,542
Subtotal		36,281				55,255				—				50,871
Impaired loans with a related allowance
Commercial
	C&I	8,551				12,555				2,900				10,163
	CRE	11,543				14,113				1,953				10,559
	Construction	726				726				117				733
Consumer
	Installment	29,675				29,675				1,674				30,361
	Home equity line	5,963				5,963				95				6,206
	Credit card	1,763				1,763				106				1,975
	Residential mortgages	13,876				13,967				1,599				13,946
Subtotal		72,097				78,762				8,444				73,943
	Total impaired loans	$	108,378			$	134,017			$	8,444			$	124,814
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represents 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 September 30, 2013, December 31, 2012 and September 30, 2012.
					As of September 30, 2013
					Number of Loans			Recorded Investment				Unpaid Principal Balance
	Originated loans
		Commercial
			C&I		35			$	5,455			$	9,533
			CRE		49			15,508				19,848
			Construction		31			958				1,237
			Total originated commercial		115			21,921				30,618
		Consumer
			Installment		1,655			28,578				29,960
			Home equity lines		240			6,916				7,255
			Credit card		339			1,253				1,253
			Residential mortgages		292			23,065				25,683
			Total originated consumer		2,526			59,812				64,151
	Total originated loans				2,641			$	81,733			$	94,769
	Acquired Loans
		Commercial
			C&I		1			6				6
			Total acquired commercial		1			6				6
		Consumer
			Home equity lines		3			260				307
			Total acquired consumer		3			260				307
	Total acquired loans				4			266				313
	Covered loans
		Commercial
			C&I		4			$	1,537			$	2,377
			CRE		24			43,024				58,252
			Construction		10			4,040				23,796
			Total covered commercial		38			48,601				84,425
		Consumer
			Home equity lines		48			5,753				5,777
			Residential mortgages		1			$	152			$	151
			Total covered consumer		49			5,905				5,928
	Total covered loans				87			$	54,506			$	90,353
	Total loans
		Commercial
			C&I		40			$	6,998			$	11,916
			CRE		73			58,532				78,100
			Construction		41			4,998				25,033
			Total commercial		154			70,528				115,049
		Consumer
			Installment		1,655			28,578				29,960
			Home equity lines		291			12,929				13,339
			Credit card		339			1,253				1,253
			Residential mortgages		293			23,217				25,834
			Total consumer		2,578			65,977				70,386
	Total loans				2,732			$	136,505			$	185,435
	Note 1: The differences between the recorded investment and unpaid principal balance amounts represents 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 represents partial charge offs.
				As of September 30, 2012
				Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I		22			$	2,413			$	8,478
		CRE		36			17,763				21,307
		Construction		27			3,577				4,025
		Total originated commercial		85			23,753				33,810
	Consumer
		Installment		1,840			32,577				34,414
		Home equity lines		229			6,922				7,202
		Credit card		426			1,767				1,767
		Residential mortgages		308			24,569				26,805
		Total originated consumer		2,803			65,835				70,188
Total originated loans				2,888			$	89,588			$	103,998
Covered loans
	Commercial
		C&I		11			$	5,278			$	6,216
		CRE		25			52,079				57,681
		Construction		10			14,640				42,567
		Total covered commercial		46			71,997				106,464
	Consumer
		Home equity lines		30			4,742				4,774
Total covered loans				76			$	76,739			$	111,238
Total loans
	Commercial
		C&I		33			$	7,691			$	14,694
		CRE		61			69,843				78,988
		Construction		37			18,216				46,592
		Total commercial		131			95,750				140,274
	Consumer
		Installment		1,840			32,577				34,414
		Home equity lines		259			11,664				11,976
		Credit card		426			1,767				1,767
		Residential mortgages		308			24,569				26,805
		Total consumer		2,833			70,577				74,962
Total loans				2,964			$	166,327			$	215,236
Note 1: The differences between the recorded investment and unpaid principal balance amounts represents 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 September 30, 2013, December 31, 2012 and September 30, 2012, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
	As of September 30, 2013
		Accruing TDRs												Nonaccruing TDRs												Total				Total
		Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
	Originated loans
	Commercial
	C&I	$	3,249			$	180			$	3,429			$	395			$	1,631			$	2,026			$	5,455			$	736
	CRE	10,333				347				10,680				1,976				2,852				4,828				15,508				294
	Construction	895				—				895				63				—				63				958				—
	Total originated commercial	14,477				527				15,004				2,434				4,483				6,917				21,921				1,030
	Consumer
	Installment	24,194				1,261				25,455				2,803				320				3,123				28,578				552
	Home equity lines	5,544				112				5,656				1,260				—				1,260				6,916				197
	Credit card	1,134				117				1,251				—				2				2				1,253				261
	Residential mortgages	12,566				3,094				15,660				4,046				3,359				7,405				23,065				1,302
	Total originated consumer	43,438				4,584				48,022				8,109				3,681				11,790				59,812				2,312
	Total originated TDRs	$	57,915			$	5,111			$	63,026			$	10,543			$	8,164			$	18,707			$	81,733			$	3,342
	Acquired loans
	Commercial
	C&I	—				—				—				—				6				6				6				—
	Total acquired commercial	—				—				—				—				6				6				6				—
	Consumer
	Home equity lines	196				—				196				—				64				64				260				—
	Total acquired consumer	196				—				196				—				64				64				260				—
	Total acquired TDRs	$	196			$	—			$	196			$	—			$	70			$	70			$	266			$	—
	Covered loans
	Commercial
	C&I	$	795			$	742			$	1,537			$	—			$	—			$	—			$	1,537			$	446
	CRE	5,479				37,545				43,024				—				—				—				43,024				2,832
	Construction	925				3,115				4,040				—				—				—				4,040				1,001
	Total covered commercial	7,199				41,402				48,601				—				—				—				48,601				4,279
	Consumer
	Home equity lines	5,256				497				5,753				—				—				—				5,753				—
	Residential mortgages	152				—				152				—				—				—				152				—
	Total covered consumer	5,408				497				5,905				—				—				—				5,905				—
	Total covered TDRs	$	12,607			$	41,899			$	54,506			$	—			$	—			$	—			$	54,506			$	4,279
	Total loans
	Commercial
	C&I	$	4,044			$	922			$	4,966			$	395			$	1,637			$	2,032			$	6,998			$	1,182
	CRE	15,812				37,892				53,704				1,976				2,852				4,828				58,532				3,126
	Construction	1,820				3,115				4,935				63				—				63				4,998				1,001
	Total commercial	21,676				41,929				63,605				2,434				4,489				6,923				70,528				5,309
	Consumer
	Installment	24,194				1,261				25,455				2,803				320				3,123				28,578				552
	Home equity lines	10,996				609				11,605				1,260				64				1,324				12,929				197
	Credit card	1,134				117				1,251				—				2				2				1,253				261
	Residential mortgages	12,718				3,094				15,812				4,046				3,359				7,405				23,217				1,302
	Total consumer	49,042				5,081				54,123				8,109				3,745				11,854				65,977				2,312
	Total TDRs	$	70,718			$	47,010			$	117,728			$	10,543			$	8,234			$	18,777			$	136,505			$	7,621
	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 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
As of September 30, 2012
	Accruing TDRs												Nonaccruing TDRs												Total				Total
	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	955			$	—			$	955			$	865			$	593			$	1,458			$	2,413			$	126
CRE	11,609				2,464				14,073				473				3,217				3,690				17,763				401
Construction	3,507				—				3,507				70				—				70				3,577				117
Total originated commercial	16,071				2,464				18,535				1,408				3,810				5,218				23,753				644
Consumer
Installment	28,604				1,071				29,675				2,882				20				2,902				32,577				1,674
Home equity lines	5,394				171				5,565				1,131				226				1,357				6,922				95
Credit card	1,655				109				1,764				—				3				3				1,767				106
Residential mortgages	11,386				3,339				14,725				6,611				3,233				9,844				24,569				1,599
Total originated consumer	47,039				4,690				51,729				10,624				3,482				14,106				65,835				3,474
Total originated TDRs	$	63,110			$	7,154			$	70,264			$	12,032			$	7,292			$	19,324			$	89,588			$	4,118
Covered loans
Commercial
C&I	$	1,000			$	4,278			$	5,278			$	—			$	—			$	—			$	5,278			$	1,527
CRE	17,298				34,782				52,080				—				—				—				52,080				8,088
Construction	6,324				8,315				14,639				—				—				—				14,639				1,632
Total covered commercial	24,622				47,375				71,997				—				—				—				71,997				11,247
Consumer
Home equity lines	4,698				44				4,742				—				—				—				4,742				—
Total covered TDRs	$	29,320			$	47,419			$	76,739			$	—			$	—			$	—			$	76,739			$	11,247
Total loans
Commercial
C&I	$	1,955			$	4,278			$	6,233			$	865			$	593			$	1,458			$	7,691			$	1,653
CRE	28,907				37,246				66,153				473				3,217				3,690				69,843				8,489
Construction	9,831				8,315				18,146				70				—				70				18,216				1,749
Total commercial	40,693				49,839				90,532				1,408				3,810				5,218				95,750				11,891
Consumer
Installment	28,604				1,071				29,675				2,882				20				2,902				32,577				1,674
Home equity lines	10,092				215				10,307				1,131				226				1,357				11,664				95
Credit card	1,655				109				1,764				—				3				3				1,767				106
Residential mortgages	11,386				3,339				14,725				6,611				3,233				9,844				24,569				1,599
Total consumer	51,737				4,734				56,471				10,624				3,482				14,106				70,577				3,474
Total TDRs	$	92,430			$	54,573			$	147,003			$	12,032			$	7,292			$	19,324			$	166,327			$	15,365
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 three months ended September 30, 2013, as well as the recorded investment in these restructured loans as of September 30, 2013.
		As of September 30, 2013
		Number of Loans			Recorded Investment
	Originated loans
	Commercial
	C&I	2			$	1,802
	CRE	4			2,668
	Construction	—			—
	Total originated commercial	6			4,470
	Consumer
	Installment	127			1,964
	Home equity lines	10			204
	Credit card	7			43
	Residential mortgages	—			—
	Total originated consumer	144			$	2,211
	Covered loans
	Commercial
	C&I	—			$	—
	CRE	—			—
	Construction	—			—
	Total covered commercial	—			$	—
	Total loans
	Commercial
	C&I	2			$	1,802
	CRE	4			2,668
	Construction	—			—
	Total commercial	6			4,470
	Consumer
	Installment	127			1,964
	Home equity lines	10			204
	Credit card	7			43
	Residential mortgages	—			—
	Total consumer	144			2,211
	Total	150			$	6,681

Allowance_for_Loan_Losses_Accr

Allowance for Loan Losses Accruing and Nonaccruing Troubled Debt Restructurings (Tables)	9 Months Ended
	Sep. 30, 2013
Accruing and Non-Accruing Troubled Debt Restructurings [Abstract]	'
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 September 30, 2013, December 31, 2012 and September 30, 2012, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
	As of September 30, 2013
		Accruing TDRs						Nonaccruing TDRs						Total		Total
		Current		Delinquent		Total		Current		Delinquent		Total		TDRs		Allowance
	Originated loans
	Commercial
	C&I	$	3,249	$	180	$	3,429	$	395	$	1,631	$	2,026	$	5,455	$	736
	CRE	10,333		347		10,680		1,976		2,852		4,828		15,508		294
	Construction	895		—		895		63		—		63		958		—
	Total originated commercial	14,477		527		15,004		2,434		4,483		6,917		21,921		1,030
	Consumer
	Installment	24,194		1,261		25,455		2,803		320		3,123		28,578		552
	Home equity lines	5,544		112		5,656		1,260		—		1,260		6,916		197
	Credit card	1,134		117		1,251		—		2		2		1,253		261
	Residential mortgages	12,566		3,094		15,660		4,046		3,359		7,405		23,065		1,302
	Total originated consumer	43,438		4,584		48,022		8,109		3,681		11,790		59,812		2,312
	Total originated TDRs	$	57,915	$	5,111	$	63,026	$	10,543	$	8,164	$	18,707	$	81,733	$	3,342
	Acquired loans
	Commercial
	C&I	—		—		—		—		6		6		6		—
	Total acquired commercial	—		—		—		—		6		6		6		—
	Consumer
	Home equity lines	196		—		196		—		64		64		260		—
	Total acquired consumer	196		—		196		—		64		64		260		—
	Total acquired TDRs	$	196	$	—	$	196	$	—	$	70	$	70	$	266	$	—
	Covered loans
	Commercial
	C&I	$	795	$	742	$	1,537	$	—	$	—	$	—	$	1,537	$	446
	CRE	5,479		37,545		43,024		—		—		—		43,024		2,832
	Construction	925		3,115		4,040		—		—		—		4,040		1,001
	Total covered commercial	7,199		41,402		48,601		—		—		—		48,601		4,279
	Consumer
	Home equity lines	5,256		497		5,753		—		—		—		5,753		—
	Residential mortgages	152		—		152		—		—		—		152		—
	Total covered consumer	5,408		497		5,905		—		—		—		5,905		—
	Total covered TDRs	$	12,607	$	41,899	$	54,506	$	—	$	—	$	—	$	54,506	$	4,279
	Total loans
	Commercial
	C&I	$	4,044	$	922	$	4,966	$	395	$	1,637	$	2,032	$	6,998	$	1,182
	CRE	15,812		37,892		53,704		1,976		2,852		4,828		58,532		3,126
	Construction	1,820		3,115		4,935		63		—		63		4,998		1,001
	Total commercial	21,676		41,929		63,605		2,434		4,489		6,923		70,528		5,309
	Consumer
	Installment	24,194		1,261		25,455		2,803		320		3,123		28,578		552
	Home equity lines	10,996		609		11,605		1,260		64		1,324		12,929		197
	Credit card	1,134		117		1,251		—		2		2		1,253		261
	Residential mortgages	12,718		3,094		15,812		4,046		3,359		7,405		23,217		1,302
	Total consumer	49,042		5,081		54,123		8,109		3,745		11,854		65,977		2,312
	Total TDRs	$	70,718	$	47,010	$	117,728	$	10,543	$	8,234	$	18,777	$	136,505	$	7,621
	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 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
As of September 30, 2012
	Accruing TDRs						Nonaccruing TDRs						Total		Total
	Current		Delinquent		Total		Current		Delinquent		Total		TDRs		Allowance
Originated loans
Commercial
C&I	$	955	$	—	$	955	$	865	$	593	$	1,458	$	2,413	$	126
CRE	11,609		2,464		14,073		473		3,217		3,690		17,763		401
Construction	3,507		—		3,507		70		—		70		3,577		117
Total originated commercial	16,071		2,464		18,535		1,408		3,810		5,218		23,753		644
Consumer
Installment	28,604		1,071		29,675		2,882		20		2,902		32,577		1,674
Home equity lines	5,394		171		5,565		1,131		226		1,357		6,922		95
Credit card	1,655		109		1,764		—		3		3		1,767		106
Residential mortgages	11,386		3,339		14,725		6,611		3,233		9,844		24,569		1,599
Total originated consumer	47,039		4,690		51,729		10,624		3,482		14,106		65,835		3,474
Total originated TDRs	$	63,110	$	7,154	$	70,264	$	12,032	$	7,292	$	19,324	$	89,588	$	4,118
Covered loans
Commercial
C&I	$	1,000	$	4,278	$	5,278	$	—	$	—	$	—	$	5,278	$	1,527
CRE	17,298		34,782		52,080		—		—		—		52,080		8,088
Construction	6,324		8,315		14,639		—		—		—		14,639		1,632
Total covered commercial	24,622		47,375		71,997		—		—		—		71,997		11,247
Consumer
Home equity lines	4,698		44		4,742		—		—		—		4,742		—
Total covered TDRs	$	29,320	$	47,419	$	76,739	$	—	$	—	$	—	$	76,739	$	11,247
Total loans
Commercial
C&I	$	1,955	$	4,278	$	6,233	$	865	$	593	$	1,458	$	7,691	$	1,653
CRE	28,907		37,246		66,153		473		3,217		3,690		69,843		8,489
Construction	9,831		8,315		18,146		70		—		70		18,216		1,749
Total commercial	40,693		49,839		90,532		1,408		3,810		5,218		95,750		11,891
Consumer
Installment	28,604		1,071		29,675		2,882		20		2,902		32,577		1,674
Home equity lines	10,092		215		10,307		1,131		226		1,357		11,664		95
Credit card	1,655		109		1,764		—		3		3		1,767		106
Residential mortgages	11,386		3,339		14,725		6,611		3,233		9,844		24,569		1,599
Total consumer	51,737		4,734		56,471		10,624		3,482		14,106		70,577		3,474
Total TDRs	$	92,430	$	54,573	$	147,003	$	12,032	$	7,292	$	19,324	$	166,327	$	15,365

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
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.
		September 30, 2013
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	87,533	$	(14,325	)	$	73,208
	Non-compete covenant	102		(96		)	6
	Lease intangible	618		(511		)	107
	Trust relationships	14,000		(1,874		)	12,126
		$	102,253	$	(16,806	)	$	85,447
		December 31, 2012
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	16,759		(10,546		)	6,213
	Non-compete covenant	102		(76		)	26
	Lease intangible	$	618	$	(484	)	$	134
		$	17,479	$	(11,106	)	$	6,373
		September 30, 2012
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Amount
	Core deposit intangibles	$	16,759	$	(10,117	)	$	6,642
	Non-compete covenant	102		(70		)	32
	Lease intangible	618		(475		)	143
		$	17,479	$	(10,662	)	$	6,817

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Shareholders' Equity [Abstract]	'
Schedule of Earnings Per Share Reconciliation	'
	The reconciliation between basic and diluted EPS using the two-class method and treasury stock method is presented as follows:
		Three Months Ended September 30,				Nine Months Ended September 30,
		2013		2012		2013		2012
	Basic EPS:
	Net income	$	40,715	$	34,953	126,510		$	95,882
	Less:
	Cash dividends on 5.875% non-cumulative perpetual series A, preferred stock	1,469		—		3,868		—
	Income allocated to participating securities	309		156		1,098		87
	Net income attributable to common shareholders	$	38,937	$	34,797	$	121,544	$	95,795
	Average common shares outstanding	166,323		110,682		145,681		110,282
	Less: participating shares included in average shares outstanding	1,279		1,037		1,279		809
	Average common shares outstanding used in basic EPS	165,044		109,645		144,402		109,473
	Basic net income per share	$	0.24	$	0.32	$	0.84	$	0.88
	Diluted EPS:
	Net income attributable to common shareholders	$	38,937	$	34,797	$	121,544	$	95,795
	Add: Undistributed earnings allocated to unvested securities	105		176		485		342
	Less: Undistributed earnings reallocated participating securities	105		176		485		342
	Income used in diluted earnings per share calculation	$	38,937	$	34,797	$	121,544	$	95,795
	Average common shares outstanding	166,323		110,682		145,681		110,282
	Add: Common Stock equivalents:
	Warrant and stock plans	3,872		—		2,939		—
	Less: participating shares included in average shares outstanding	1,279		1,037		1,279		809
	Average common and Common Stock equivalent shares outstanding	168,916		109,645		147,341		109,473
	Diluted net income per share	$	0.23	$	0.32	$	0.82	$	0.88

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Lines of business results and key performance measures	'
	The Corporation’s business is conducted solely in the United States of America. The following tables present a summary of financial results as of and for the three and nine months ended September 30, 2013 and September 30, 2012:
																							FirstMerit
		Commercial					Retail				Wealth						Other						Consolidated
	September 30, 2013	QTD			YTD		QTD		YTD		QTD			YTD			QTD			YTD			QTD		YTD
	OPERATIONS:
	Net interest income (loss)	$	106,443		$	277,468	$	99,548	$	239,922	$	3,613		$	11,162		$	(6,264	)	$	(15,835	)	$	203,340	$	512,717
	Provision for loan losses	(27		)	6,866		905		7,071		(736		)	(570		)	6,237			10,267			6,379		23,634
	Other income	21,364			60,980		30,723		88,916		13,216			34,347			5,787			13,680			71,090		197,923
	Other expenses	57,033			151,587		96,153		235,518		14,650			38,698			43,542			82,140			211,378		507,943
	Net income (loss)	46,021			116,997		21,589		56,061		1,894			4,796			(28,789		)	(51,344		)	40,715		126,510
	AVERAGES:
	Assets	8,685,333			8,020,824		5,659,553		4,646,817		266,028			255,538			9,402,680			7,709,479			24,013,594		20,632,658
																							FirstMerit
		Commercial					Retail				Wealth						Other						Consolidated
	September 30, 2012	QTD			YTD		QTD		YTD		QTD			YTD			QTD			YTD			QTD		YTD
	OPERATIONS:
	Net interest income (loss)	$	65,446		$	193,776	$	51,181	$	158,745	$	4,223		$	13,412		$	(2,960	)	$	(10,333	)	$	117,890	$	355,600
	Provision for loan losses	10,401			22,970		1,194		5,459		(519		)	(318		)	5,103			14,325			16,179		42,436
	Other income	15,247			47,603		26,783		76,226		8,528			24,987			4,367			13,136			54,925		161,952
	Other expenses	39,595			123,074		53,788		169,618		9,711			29,718			5,493			19,022			108,587		341,432
	Net income (loss)	19,954			61,967		14,939		38,931		2,313			5,849			(2,253		)	(10,865		)	34,953		95,882
	AVERAGES:
	Assets	6,466,355			6,386,617		2,960,336		2,929,911		242,539			238,899			5,064,786			5,041,099			14,734,016		14,596,526

Derivatives_Instruments_and_He1

Derivatives Instruments and Hedging Activities Disclosure (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Notional values or contractual amounts and fair value of the Corporation's derivatives designated in hedge relationships	'
	At September 30, 2013, December 31, 2012 and September 30, 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
		September 30, 2013						December 31, 2012							September 30, 2012					September 30, 2013				December 31, 2012				September 30, 2012
		Notional/ Contract Amount			Fair			Notional/ Contract Amount			Fair				Notional/ Contract Amount			Fair		Notional/ Contract Amount		Fair		Notional/ Contract Amount		Fair		Notional/ Contract Amount		Fair
					Value (a)						Value (a)							Value (a)				Value (b)				Value (b)				Value (b)
	Interest rate swaps:
	Fair value hedges	$	—		$	—		$	—		$	—			$	—		$	—	$	133,159	$	13,289	$	161,133	$	19,080	$	182,950	$	22,071
	(a) Included in Other Assets on the Consolidated Balance Sheet
	(b) Included in Other Liabilities on the Consolidated Balance Sheet
Notional values or contractual amounts and fair value of the Corporation's derivatives not designated in hedge	'
	As of September 30, 2013, December 31, 2012 and September 30, 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
		September 30, 2013						December 31, 2012							September 30, 2012					September 30, 2013				December 31, 2012				September 30, 2012
		Notional/ Contract Amount			Fair Value(a)			Notional/ Contract Amount			Fair Value(a)				Notional/ Contract Amount			Fair Value(a)		Notional/ Contract Amount		Fair Value(b)		Notional/ Contract Amount		Fair Value(b)		Notional/ Contract Amount		Fair Value(b)
	Interest rate swaps	$	1,546,228		$	51,044		$	1,204,835		$	58,769			$	1,166,765		$	62,796	$	1,546,228	$	51,044	$	1,204,835	$	58,769	$	1,166,765	$	62,796
	Mortgage loan commitments	144,572			2,729			168,271			4,400				221,057			7,394		—		—		—		—		—		—
	Forward sales contracts	—			—			—			—				—			—		68,581		1,081		124,017		62		144,849		2,223
	Credit contracts	—			—			—			—				—			—		50,336		—		25,225		—		20,861		—
	Foreign exchange	5,716			66			6,662			62				4,363			80		6,295		92		6,026		57		4,371		71
	Other	—			—			—			—				—			—		54,763		—		31,492		—		27,898		—
	Total	$	1,696,516		$	53,839		$	1,379,768		$	63,231			$	1,392,185		$	70,270	$	1,726,203	$	52,217	$	1,391,595	$	58,888	$	1,364,744	$	65,090
	(a) Included in Other Assets on the Consolidated Balance Sheet
	(b) Included in Other Liabilities on the Consolidated Balance Sheet
Gains and losses recognized in income on non-designated hedging instruments	'
	Gains and losses recognized in income on non-designated hedging instruments for the three and nine months ended September 30, 2013 and 2012 are as follows:
	Derivatives not		Location of Gain/(Loss)	Amount of Gain / (Loss) Recognized in Income on Derivatives
	designated as hedging		Recognized
	instruments		in Income on	Three Months Ended September 30,						Nine Months Ended September 30,
			Derivative	2013			2012			2013				2012
	Mortgage loan commitments		Other operating income	$	1,950		$	2,146		$	(1,672	)		$	2,435
	Forward sales contracts		Other operating income	(5,538		)	(1,023		)	(1,019		)		(425		)
	Foreign exchange contracts		Other operating income	195			136			(118		)		196
	Other		Other operating expense	—			—			—				—
	Total			$	(3,393	)	$	1,259		$	(2,809	)		$	2,206
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 September 30, 2013, December 31, 2012 and September 30, 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 September 30, 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 - non-designated	$	2,585		$	—		$	2,585		$	(2,585	)		$	—		$	—
	Foreign exchange	66			—			66			(92		)		26			—
	Total derivative assets	$	2,651		$	—		$	2,651		$	(2,677	)		$	26		$	—
	Derivative Liabilities
	Interest rate swaps - designated	$	13,289		$	—		$	13,289		$	—			$	(13,289	)	$	—
	Interest rate swaps - non-designated	48,458			—			48,458			(2,585		)		(45,873		)	—
	Foreign exchange	92			—			92			(92		)		—			—
	Total derivative liabilities	$	61,839		$	—		$	61,839		$	(2,677	)		$	(59,162	)	$	—
		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 - non-designated	$	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 - non-designated	58,714			—			58,714			(55		)		(58,659		)	—
	Foreign exchange	45			—			45			(14		)		(31		)	—
	Total derivative liabilities	$	77,839		$	—		$	77,839		$	(69	)		$	(77,770	)	$	—
		As of September 30, 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 - non-designated	$	63		$	—		$	63		$	(63	)		$	—		$	—
	Foreign exchange	22			—			22			(22		)		—			—
	Total derivative assets	$	85		$	—		$	85		$	(85	)		$	—		$	—
	Derivative Liabilities
	Interest rate swaps - designated	$	22,071		$	—		$	22,071		$	—			$	(22,071	)	$	—
	Interest rate swaps - non-designated	62,733			—			62,733			(63		)		(62,670		)	—
	Foreign exchange	56			—			56			(22		)		(34		)	—
	Total derivative liabilities	$	84,860		$	—		$	84,860		$	(85	)		$	(84,775	)	$	—
	(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.

Benefit_Plans_Tables

Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2013
FirstMerit	'
Schedule of Net Benefit Costs [Line Items]	'
Schedule of Net Benefit Costs	'
	The components of net periodic benefit cost are as follows:
		Pension Benefits
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Components of Net Periodic Pension Cost
	Service Cost	$	585		$	1,799		$	1,755		$	5,397
	Interest Cost	2,632			2,965			7,896			8,895
	Expected return on assets	(2,960		)	(3,034		)	(8,880		)	(9,102		)
	Amortization of unrecognized prior service costs	117			97			351			291
	Cumulative net loss	1,174			2,593			3,522			7,779
	Net periodic pension cost	$	1,548		$	4,420		$	4,644		$	13,260
		Postretirement Benefits
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Components of Net Periodic Postretirement Cost
	Service Cost	$	24		$	19		$	74		$	57
	Interest Cost	130			174			390			522
	Amortization of unrecognized prior service costs	(117		)	(117		)	(351		)	(351		)
	Cumulative net loss	67			72			201			216
	Net periodic postretirement cost	$	104		$	148		$	314		$	444
Citizens Republic Bancorp	'
Schedule of Net Benefit Costs [Line Items]	'
Schedule of Net Benefit Costs	'
	Net periodic benefits and costs for the Citizens sponsored plans including the following components for the three and nine months ended September 30, 2013:
		Pension Benefits
		Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013
	Interest Cost	$	795		$	1,590
	Expected return on assets	(1,096		)	(2,192		)
	Net periodic pension benefit	$	(301	)	$	(602	)
		Postretirement Benefits
		Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013
	Interest Cost	$	15,770		$	31,540
	Net periodic postretirement cost	$	15,770		$	31,540

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 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 as of September 30, 2013, December 31, 2012 and September 30, 2012:
					Fair Value by Hierarchy
		30-Sep-13			Level 1			Level 2			Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	3,096		$	3,096		$	—		$	—
	Non-marketable equity securities	3,281			—			10			3,271
	U.S. States and political subdivisions	272,224			—			272,224			—
	Residential mortgage-backed securities:
	U.S. government agencies	999,375			—			999,375			—
	Commercial mortgage-backed securities:
	U.S. government agencies	55,932			—			55,932			—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,505,706			—			1,505,706			—
	Non-agency	9			—			—			9
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	97,154			—			97,154			—
	Corporate debt securities	50,850			—			—			50,850
	Asset-backed securities:
	Collateralized loan obligations, non-agency issued	268,632			—			—			268,632
	Total available for sale securities	3,256,259			3,096			2,930,401			322,762
	Residential loans held for sale	17,813			—			17,813			—
	Derivative assets:
	Interest rate swaps - nondesignated	51,044			—			51,044			—
	Mortgage loan commitments	2,729			—			2,729			—
	Foreign exchange	66			—			66			—
	Total derivative assets	53,839			—			53,839			—
	Total fair value of assets (a)	$	3,327,911		$	3,096		$	3,002,053		$	322,762
	Derivative liabilities:
	Interest rate swaps - fair value hedges	$	13,289		$	—		$	13,289		$	—
	Interest rate swaps - nondesignated	51,044			—			51,044			—
	Forward sales contracts	1,081			—			1,081			—
	Foreign exchange	92			—			92			—
	Total derivative liabilities	65,506			—			65,506			—
	True-up liability	11,457			—			—			11,457
	Total fair value of liabilities (a)	$	76,963		$	—		$	65,506		$	11,457
	Nonrecurring fair value measurement
	Mortgage servicing rights (b)	$	22,616		$	—		$	—		$	22,616
	Impaired loans (c)	48,129			—			—			48,129
	Other property (d)	13,413			—			—			13,413
	Other real estate covered by loss share (e)	8,475			—			—			8,475
	Total fair value	$	92,633		$	—		$	—		$	92,633
	(a) - There were no transfers between levels 1 and 2 of the fair value hierarchy during the three months ended September 30, 2013.
	(b) - MSRs with a recorded investment of $22.9 million were reduced by a specific valuation allowance totaling $0.6 million to a reported carrying value of $22.4 million resulting in recognition of $0.1 million in recoveries included in loans sales and servicing income in the three months ended September 30, 2013.
	(c) - Collateral dependent impaired loans with a recorded investment of $51.3 million were reduced by specific valuation allowance allocations totaling $3.1 million to a reported net carrying value of $48.1 million.
	(d) - Amounts do not include assets held at cost at September 30, 2013. During the three months ended September 30, 2013, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.3 million included in noninterest expense.
	(e) - Amounts do not include assets held at cost at September 30, 2013. During the three months ended September 30, 2013, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses $0.2 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			—
	Non-agency	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 and 2 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 recognition of an impairment charge of $1.0 million 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 by Hierarchy
	30-Sep-12			Level 1			Level 2			Level 3
Recurring fair value measurement
Available-for-sale securities:
Marketable equity securities	$	3,245		$	3,245		$	—		$	—
U.S. government agency debentures	35,137			—			35,137			—
U.S. States and political subdivisions	258,418			—			258,418			—
Residential mortgage-backed securities:
U.S. government agencies	1,277,831			—			1,277,831			—
Commercial mortgage-backed securities:
U.S. government agencies	15,667			—			15,667			—
Residential collateralized mortgage-backed securities:
U.S. government agencies	1,205,525			—			1,205,525			—
Non-agency	12			—			1			11
Commercial collateralized mortgage-backed securities:
U.S. government agencies	68,665			—			68,665			—
Corporate debt securities	47,493			—			—			47,493
Total available-for-sale securities	2,911,993			3,245			2,861,244			47,504
Residential loans held for sale	17,540			—			17,540			—
Derivative assets:
Interest rate swaps - nondesignated	62,796			—			62,796			—
Mortgage loan commitments	7,394			—			7,394			—
Foreign exchange	80			—			80			—
Total derivative assets	70,270			—			70,270			—
Total fair value of assets (a)	$	2,999,803		$	3,245		$	2,949,054		$	47,504
Derivative liabilities:
Interest rate swaps - fair value hedges	22,071			—			22,071			—
Interest rate swaps - nondesignated	62,796			—			62,796			—
Forward sale contracts	2,223			—			2,223			—
Foreign exchange	71			—			71			—
Total derivative liabilities	87,161			—			87,161			—
True-up liability	12,642			—			—			12,642
Total fair value of liabilities (a)	$	99,803		$	—		$	87,161		$	12,642
Nonrecurring fair value measurement
Mortgage servicing rights (b)	$	17,294		$	—		$	—		$	17,294
Impaired loans (c)	44,010			—			—			44,010
Other property (d)	6,333			—			—			6,333
Other real estate covered by loss share (e)	14,695			—			—			14,695
Total fair value	$	82,332		$	—		$	—		$	82,332
(a) - There were no transfers between levels 1 and 2 of the fair value hierarchy during the three months ended September 30, 2012.
(b) - Mortgage servicing rights with a recorded investment of $21.3 million were reduced by a specific valuation allowance totaling $4.1 million to a reported carrying value of $17.2 million resulting in recognition of a recovery of $0.6 million in the three months ended September 30, 2012.
(c) - Collateral dependent impaired loans with a recorded investment of $52.5 million were reduced by specific valuation allowance allocations totaling $8.5 million to a reported net carrying value of $44.0 million.
(d) - Amounts do not include assets held at cost at September 30, 2012. During the three months ended September 30, 2012, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.1 million included in noninterest expense.
(e) - Amounts do not include assets held at cost at September 30, 2012. During the three months ended September 30, 2012, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.2 million included in noninterest expense.
Summary of changes in Level 3 assets and liabilities measured at fair value	'
	The changes in Level 3 assets and liabilities measured at fair value on a recurring basis for the three and nine months ended September 30, 2013 and 2012 are summarized as follows:
		Three Months Ended September 30,											Nine Months Ended September 30,
		2013						2012					2013						2012
		Available-for-sale securities			True-up liability			Available-for-sale securities			True-up liability		Available-for-sale securities			True-up liability			Available-for-sale securities			True-up liability
	Balance at beginning of period	$	212,512		$	10,937		$	48,096		$	11,820	$	49,661		$	12,259		$	87,539		$	11,551
	Fair value of assets acquired	—			—								3,271			—			—			—
	(Gains) losses included in earnings (a)	—			520			—			822		—			—			—			1,091
	Unrealized gains (losses) (b)	(1,704		)				(605		)	—		(2,066		)	(802		)	3,137			—
	Purchases	111,940			—			—			—		271,856			—			—			—
	Sales	—			—			—			—		—			—			(40,520		)	—
	Settlements	13			—			13			—		39			—			(2,652		)	—
	Net transfers into (out of) Level 3	—			—			—			—		—			—			—			—
	Balance at ending of period	$	322,761		$	11,457		$	47,504		$	12,642	$	322,761		$	11,457		$	47,504		$	12,642
	(a) Reported in other expense
	(b) Reported in other comprehensive income (loss)
Summary of 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 September 30, 2013, December 31, 2012 and September 30, 2012. The aggregate fair value, contractual balance and gain or loss on loans held for sale was as follows:
			September 30, 2013			December 31, 2012			September 30, 2012
	Aggregate fair value carrying amount		$	17,813		$	23,683		$	17,540
	Aggregate unpaid principal / contractual balance		17,179			22,765			16,635
	Carrying amount over aggregate unpaid principal (a)		$	634		$	918		$	905
	(a) These changes are included in loan sales and servicing income in the Consolidated Statements of Comprehensive Income.
Fair Value of Financial Instruments	'
		September 30, 2013
		Carrying			Fair Value
		Amount			Total			Level 1			Level 2		Level 3
	Financial assets:
	Cash and cash equivalents	$	1,247,267		$	1,247,267		$	1,247,267		$	—	$	—
	Available-for-sale securities	3,256,259			3,256,259			3,096			2,930,401		322,762
	Held-to-maturity securities	2,749,934			2,658,433			—			2,658,433		—
	Other securities	270,369			270,369			—			270,369		—
	Loans held for sale	17,813			17,813			—			17,813		—
	Net originated loans	9,690,848			9,623,848			—			—		9,623,848
	Net acquired loans	3,825,751			3,825,751			—			—		3,825,751
	Net covered loans and loss share receivable	608,732			608,732			—			—		608,732
	Accrued interest receivable	49,820			49,820			—			49,820		—
	Derivatives	53,839			53,839			—			53,839		—
	Financial liabilities:
	Deposits	$	19,489,533		$	19,508,531		$	—		$	19,508,531	$	—
	Federal funds purchased and securities sold under agreements to repurchase	1,049,801			1,049,801			—			1,049,801		—
	Wholesale borrowings	200,858			204,461			—			204,461		—
	Long-term debt	324,425			321,255			—			321,255		—
	Accrued interest payable	5,884			5,884			—			5,884		—
	Derivatives	65,506			65,506			—			65,506		—
		December 31, 2012
		Carrying			Fair Value
		Amount			Total			Level 1			Level 2		Level 3
	Financial assets:
	Cash and cash equivalents	$	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 originated 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		—
		September 30, 2012
		Carrying			Fair Value
		Amount			Total			Level 1			Level 2		Level 3
	Financial assets:
	Cash and cash equivalents	$	238,417		$	238,417		$	238,417		$	—	$	—
	Available for sale securities	2,911,993			2,911,993			3,245			2,861,244		47,504
	Held to maturity securities	620,631			631,237			—			631,237		—
	Other securities	140,730			140,730			—			140,730		—
	Loans held for sale	17,540			17,540			—			17,540		—
	Net originated loans	8,217,478			7,898,195			—			—		7,898,195
	Net covered loans and loss share receivable	1,131,285			1,131,285			—			—		1,131,285
	Accrued interest receivable	43,901			43,901			—			43,901		—
	Derivatives	70,270			70,270			—			70,270		—
	Financial liabilities:
	Deposits	$	11,532,426		$	11,540,681		$	—		$	11,540,681	$	—
	Federal funds purchased and securities sold under agreements to repurchase	963,455			963,455			—			963,455		—
	Wholesale borrowings	178,083			187,230			—			187,230		—
	Accrued interest payable	2,798			2,798			—			2,798		—
	Derivatives	87,161			87,161			—			87,161		—

Mortgage_Servicing_Rights_and_1

Mortgage Servicing Rights and Mortgage Servicing Activity (Tables)	9 Months Ended
	Sep. 30, 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:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
	Balance at beginning of period	$	22,604		$	21,273		$	21,316		$	21,179
	Addition of Citizens' mortgage servicing rights on Acquisition Date	—			—			1,065			—
	Additions	1,450			1,408			4,151			4,597
	Amortization	(1,131		)	(1,390		)	(3,609		)	(4,485		)
	Balance at end of period	22,923			21,291			22,923			21,291
	Valuation allowance at beginning of period	(482		)	(3,488		)	(2,564		)	(3,539		)
	Recoveries (Additions)	(90		)	(590		)	1,992			(539		)
	Valuation allowance at end of period	(572		)	(4,078		)	(572		)	(4,078		)
	Mortgage servicing rights, net carrying balance	$	22,351		$	17,213		$	22,351		$	17,213
	Fair value at end of period	$	22,616		$	17,294		$	22,616		$	17,294
Changes in Key economics assumptions	'
	Prepayment speed assumption (annual CPR)	10.56		%
	Decrease in fair value from 10% adverse change	$	750
	Decrease in fair value from 25% adverse change	$	1,456
	Discount rate assumption	9.86		%
	Decrease in fair value from 100 basis point adverse change	$	704
	Decrease in fair value from 200 basis point adverse change	$	1,362
	Expected weighted-average life (in months)	98

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Commitments to Extend Credit	'
			September 30, 2013			December 31, 2012			September 30, 2012
	Loan Commitments
		Commercial	$	3,521,227		$	2,431,023		$	2,406,226
		Consumer	2,057,115			1,720,518			1,687,955
		Total loan commitments	$	5,578,342		$	4,151,541		$	4,094,181
Schedule of Guarantor Obligations	'
			September 30, 2013			December 31, 2012			September 30, 2012
	Financial guarantees
		Standby letters of credit	$	221,229		$	136,202		$	125,791
		Loans sold with recourse	50,882			42,383			39,251
		Total financial guarantees	$	272,111		$	178,585		$	165,042
Changes in Repurchase Reserve	'
	Changes in the amount of the repurchase reserve for the three and nine months ended September 30, 2013 and 2012 are as follows:
		Three Months Ended September 30, 2013
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchase reserve
	Balance at beginning of period	$	7,287		$	1,106		$	8,393
	Assumed obligation	—			—			—
	Net realized losses	(1,983		)	—			(1,983		)
	Net increase (decrease) to reserve	2,546			3			2,549
	Balance at end of period	$	7,850		$	1,109		$	8,959
		Three Months Ended September 30, 2012
		Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	750		$	1,263		$	2,013
	Net realized losses	(202		)	—			(202		)
	Net increase (decrease) to reserve	552			(70		)	482
	Balance at end of period	$	1,100		$	1,193		$	2,293
		Nine Months Ended September 30, 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	(3,053		)	—			(3,053		)
	Net increase (decrease) to reserve	3,403			(58		)	3,345
	Balance at end of period	$	7,850		$	1,109		$	8,959
		Nine Months Ended September 30, 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	(569		)	—			(569		)
	Net increase (decrease) to reserve	1,199			(80		)	1,119
	Balance at end of period	$	1,100		$	1,193		$	2,293

Changes_and_Reclassifications_1

Changes and Reclassifications Out of Accumulated Other Comprehensive Income Period Changes and Reclassifications Out of Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Period Changes Out of Accumulated Other Comprehensive Income [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss)	'
	Changes and Reclassifications Out of Accumulated Other Comprehensive Income
	The following table presents the changes in AOCI by component of comprehensive income for the three and nine months ended September 30, 2013:
		Three Months Ended September 30, 2013									Nine Months Ended September 30, 2013
		Unrealized securities gains and losses			Pension and post- retirement costs			Total			Unrealized securities gains and losses			Pension and post- retirement costs			Total
	Balance at the beginning of the period	$	(274	)	$	(71,623	)	$	(71,897	)	$	55,418		$	(71,623	)	$	(16,205	)
	Amounts recognized in other comprehensive income, net of taxes of $26.7 million and $31.0 million	(11,716		)	—			(11,716		)	(69,229		)	—			(69,229		)
	Reclassified amounts out of accumulated other comprehensive income, net of tax of $0.978 million and $0.981 million	—			—			—			1,821			—			1,821
	Balance at the end of the period	$	(11,990	)	$	(71,623	)	$	(83,613	)	$	(11,990	)	$	(71,623	)	$	(83,613	)
Tax Effect of Changes and Reclassifications Out of Accumulated Other Comprehensive Income	'
	The following table presents current period reclassifications out of AOCI by component of comprehensive income for the three and nine months ended September 30, 2013:
		Three Months Ended September 30, 2013			Nine Months Ended September 30, 2013			Income statement line item presentation
	Realized (gains) losses on sale of securities	$	—		$	2,802		Investment securities losses (gains), net
	Tax expense (benefit) (35%)	—			(981		)	Income tax expense (benefit)
	Reclassified amount, net of tax	$	—		$	1,821

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Preamble (Details) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified	Branch
Variable Interest Entity [Line Items]	'
Number of Branches	412
VIE 1	'
Variable Interest Entity [Line Items]	'
Variable Interest Entity-Aggregate Liquidation Amount Outstanding	48.7
VIE 2	'
Variable Interest Entity [Line Items]	'
Variable Interest Entity-Aggregate Liquidation Amount Outstanding	25.8

Business_Combinations_Details

Business Combinations (Details) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

6 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 12, 2013

Dec. 31, 2012

Apr. 15, 2013

Apr. 12, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Feb. 04, 2013

Sep. 12, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 12, 2013

Apr. 12, 2013

Apr. 12, 2013

Sep. 30, 2013

Sep. 30, 2013

Branch

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

FirstMerit

Citizens Republic Bancorp

Acquired Loans

Michigan and Wisconsin

Michigan and Wisconsin

Branch

Branch

Junior Subordinated Debt

Junior Subordinated Debt

Junior Subordinated Debt

Citizens Republic Bancorp

Minimum

Maximum

Business Combinations [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans

'

'

'

'

'

'

'

$4,624,293,000

'

'

'

'

'

'

'

'

'

'

$4,624,293,000

'

'

Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Loans

'

'

'

'

'

'

'

'

200,000

'

200,000

'

'

'

'

'

'

'

'

'

'

Assets

24,134,986,000

14,628,843,000

24,134,986,000

14,628,843,000

'

14,913,012,000

'

'

'

'

'

'

9,600,000,000

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

55,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Branches

412

'

412

'

'

'

'

'

219

'

219

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

1.37

'

'

'

'

'

'

'

'

'

'

'

'

'

FirstMerit shares of Common Stock issued for Citizens' shares

'

'

'

'

'

'

'

55,468,283

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of Citizens TARP Preferred Stock

'

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

250,000,000

'

'

'

'

'

'

'

'

'

Interest Rate subordinated notes

'

'

'

'

'

'

'

'

'

'

'

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

1,757,812.50

'

'

'

Goodwill

'

'

'

'

'

'

'

274,838,000

500,000

'

'

'

'

'

'

'

'

'

'

'

'

Interest Income, Operating

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

164,400,000

'

Net income

40,715,000

34,953,000

126,510,000

95,882,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31,600,000

Business Acquisition, Purchase Price Allocation, deferred tax asset

'

'

'

'

'

'

'

312,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

345,100,000

300,000

'

300,000

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Purchase Price Allocation, Deferred Tax Liabilities, Noncurrent

'

'

'

'

'

'

'

51,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Tax Assets, Net

'

'

'

'

'

'

'

261,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

224,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Business combination, deferred tax asset fair market value adjustment

'

'

'

'

'

'

'

83,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Acquisition Related Costs

'

'

'

'

'

'

'

'

33,400,000

'

69,100,000

'

'

'

'

'

'

'

'

'

'

Contractual required payments receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,107,315,000

'

'

Nonaccretable difference

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-130,096,000

'

'

Investment Securities

'

'

'

'

'

'

'

3,202,577,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

591,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Prepayment penalties on federal home loan bank advances

'

'

'

'

'

'

60,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal home loan bank advances retained

'

'

'

'

'

'

'

'

60,000,000

'

60,000,000

'

'

'

'

'

'

'

'

'

'

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Subordinated Debt

'

'

'

'

'

'

'

74,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Description of Variable Rate Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.10%

11.75%

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

115,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

138,536,000

200,000

'

200,000

'

'

'

'

'

'

'

'

'

'

Business Combination Recognized Identifiable Assets Acquired And Liabilities, Accrued Interest and Other Assets

'

'

'

'

'

'

'

'

400,000

'

400,000

'

'

'

'

'

'

'

'

'

'

Exercise Price of Warrants or Rights

'

'

'

'

$18.69

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business_Combinations_Recogniz

Business Combinations Recognized Identifable Assets Acquired and Liabilities Assumed (Details) (USD $)

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Apr. 12, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 12, 2013

Sep. 30, 2013

Apr. 12, 2013

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Core Deposits

Core Deposits

Core Deposits

Customer Relationships

Customer Relationships

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

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

0

3,000

'

'

'

'

'

'

'

Business Combination, Consideration Transferred

'

'

'

'

1,283,643

'

'

'

'

'

Cash and due from banks

'

'

544,380

'

'

'

'

'

'

'

Investment Securities

'

'

3,202,577

'

'

'

'

'

'

'

Loans

'

'

4,624,293

'

'

'

'

'

'

'

Premises and equipment

'

'

138,536

200

'

'

'

'

'

'

Intangible assets

'

'

84,774

[1]

'

'

'

'

70,800

[1]

14,000

[1]

14,000

[1]

Accrued interest receivable and other assets

'

'

678,639

'

'

'

'

'

'

'

Total assets

'

'

9,273,199

'

'

'

'

'

'

'

Deposits

'

'

7,276,754

'

'

'

'

'

'

'

Borrowings

'

'

908,824

'

'

'

'

'

'

'

Accrued taxes, expenses, and other liabilities

'

'

78,816

'

'

'

'

'

'

'

Total liabilities

'

'

8,264,394

'

'

'

'

'

'

'

Net identifiable assets acquired

'

'

1,008,805

'

'

'

'

'

'

'

Goodwill

'

'

$274,838

$500

'

'

'

'

'

'

Finite-Lived Intangible Asset, Useful Life

'

'

'

'

'

'10 years

'15 years

'

'12 years

'

[1]

Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful life for which the core deposit intangible and the trust relationships are being amortized over is 15 years and 12 years, respectively.

Business_Combinations_Acquisit

Business Combinations Acquisition Pro Forma Table (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition, Pro Forma Information [Line Items]	'	'	'	'
Income Tax Expense (Benefit)	$15,958	$13,096	$52,553	$37,802
Citizens Republic Bancorp	'	'	'	'
Business Acquisition, Pro Forma Information [Line Items]	'	'	'	'
Income Tax Expense (Benefit)	'	'	276,800	'
Total revenue, net of interest expense	342,756	325,086	959,045	949,884
Net income	$66,237	$89,193	$221,468	$528,691	[1]
[1]	Note: 2012 net income includes approximately $276.8 million of tax benefits as a result of Citizens restoration of its DTA.

Business_Combinations_Acquired

Business Combinations Acquired Loans Table (Details) (USD $)	Apr. 12, 2013
In Thousands, unless otherwise specified
Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	$4,624,293
Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	824,608
Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	3,799,685
C&I | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	1,760,100
C&I | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	95,188
C&I | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	1,664,912
CRE | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	739,105
CRE | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	380,039
CRE | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	359,066
Construction | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	30,534
Construction | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	13,399
Construction | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	17,135
Residential mortgages | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	512,743
Residential mortgages | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	233,007
Residential mortgages | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	279,736
Installment | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	1,219,612
Installment | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	54,377
Installment | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	1,165,235
Home equity lines | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	362,199
Home equity lines | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	48,598
Home equity lines | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	313,601
Total consumer | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	2,094,554
Total consumer | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	335,982
Total consumer | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	1,758,572
Total commercial | Acquired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	2,529,739
Total commercial | Acquired Impaired Loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	488,626
Total commercial | Acquired performing loans	'
Loans Acquired in Acquisition by Class [Line Items]	'
Loans	$2,041,113

Business_Combinations_Reconcil

Business Combinations Reconciliation of Carrying Amount of Acquired Loans (Details) (USD $)	Apr. 12, 2013
In Thousands, unless otherwise specified
Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Contractual required payments receivable	$1,086,503
Nonaccretable difference	-130,096
Expected cash flows	956,407
Accretable yield	-131,799
Carrying balance	824,608
Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Contractual required payments receivable	4,020,812
Nonaccretable difference	0
Expected cash flows	4,020,812
Accretable yield	-221,127
Carrying balance	3,799,685
Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Contractual required payments receivable	5,107,315
Nonaccretable difference	-130,096
Expected cash flows	4,977,219
Accretable yield	-352,926
Carrying balance	$4,624,293

Investment_Securities_Amortize

Investment Securities (Amortized Cost Table) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	$3,286,109	$2,848,771	$2,827,822
Available-for-sale Securities Fair Value	3,256,259	2,920,971	2,911,993
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	2,749,934	622,121	620,631
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	2,749,934	622,121	620,631
Held-to-maturity Securities, Fair Value	2,658,433	630,799	631,237
Available-for-sale Securities, Gross Unrealized Gain at End of Period	40,612	85,122	98,609
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-70,462	-12,922	-14,438
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	6,651	8,764	10,623
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-98,152	-86	-17
US Government Agencies Debt Securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	'	'	35,109
Available-for-sale Securities Fair Value	'	'	35,137
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	25,000	'	'
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	23,864	'	'
Held-to-maturity Securities, Fair Value	23,864	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	'	'	28
Available-for-sale Securities, Gross Unrealized Loss at End of Period	'	'	0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	'	'
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-1,136	'	'
U.S. States and political subdivisions debt securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	267,470	253,198	241,436
Available-for-sale Securities Fair Value	272,224	268,204	258,418
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	453,230	270,005	262,091
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	449,066	275,061	269,020
Held-to-maturity Securities, Fair Value	449,066	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	8,249	15,235	17,003
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-3,495	-229	-21
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	5,093	5,126	6,946
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-9,257	-70	-17
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	983,255	1,058,005	1,216,671
Available-for-sale Securities Fair Value	999,375	1,107,063	1,277,831
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	377,980	'	'
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	370,470	'	'
Held-to-maturity Securities, Fair Value	370,470	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	26,155	49,058	61,160
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-10,035	0	0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	1,068	'	'
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-8,578	'	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	58,129	52,014	15,434
Available-for-sale Securities Fair Value	55,932	52,036	15,667
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	50,179	33,165	33,149
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	49,166	33,977	33,941
Held-to-maturity Securities, Fair Value	49,166	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	23	428	233
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-2,220	-406	0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	12	812	792
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-1,025	0	0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	1,538,991	1,311,501	1,188,072
Available-for-sale Securities Fair Value	1,505,706	1,329,421	1,205,525
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	1,523,792	123,563	129,265
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	1,455,252	124,080	129,661
Held-to-maturity Securities, Fair Value	1,455,252	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	5,710	18,180	17,836
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-38,995	-260	-383
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	179	533	396
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-68,719	-16	0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	9	11	12
Available-for-sale Securities Fair Value	9	11	12
Securities held to maturity	'	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	0	0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	98,440	109,260	66,316
Available-for-sale Securities Fair Value	97,154	111,343	68,665
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	220,410	98,924	98,961
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	211,474	99,696	100,015
Held-to-maturity Securities, Fair Value	211,474	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	404	2,221	2,349
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-1,690	-138	0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	772	1,054
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-8,936	0	0
Collateralized Loan Obligations	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	271,856	'	'
Available-for-sale Securities Fair Value	268,632	'	'
Securities held to maturity	'	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	71	'	'
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-3,295	'	'
Corporate debt securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	61,582	61,541	61,527
Available-for-sale Securities Fair Value	50,850	49,652	47,493
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	94,343	96,464	97,165
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	94,136	97,985	98,600
Held-to-maturity Securities, Fair Value	94,136	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-10,732	-11,889	-14,034
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	294	1,521	1,435
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-501	0	0
Debt Securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	3,279,732	2,845,530	2,824,577
Available-for-sale Securities Fair Value	3,249,882	2,917,730	2,908,748
Securities held to maturity	'	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	40,612	85,122	98,609
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-70,462	-12,922	-14,438
Marketable Securities and Investments Held at Cost	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	3,096	3,241	3,245
Available-for-sale Securities Fair Value	3,096	3,241	3,245
Securities held to maturity	'	'	'
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0	0	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	0	0
Other Security Investments	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	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	'	'
Equity Securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Amortized Cost Basis	6,377	'	'
Available-for-sale Securities Fair Value	6,377	3,241	3,245
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	'	'
US Treasury Securities	'	'	'
Securities held to maturity	'	'	'
Held-to-maturity Securities, Amortized Cost	5,000	'	'
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure	5,005	'	'
Held-to-maturity Securities, Fair Value	5,005	'	'
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	5	'	'
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	$0	'	'

Investment_Securities_Other_In

Investment Securities (Other Investments Table) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Other investments	'	'	'
FRB stock	$55,294	$21,045	$21,045
FHLB stock	214,586	119,145	119,145
Other	489	527	540
Total other investments	$270,369	$140,717	$140,730

Investment_Securities_Realized

Investment Securities (Realized Gain Loss Table) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Proceeds and gross unrealized gains and losses on sales of available-for-sale securities	'	'	'	'
Proceeds	$0	$29,735	$2,180,624	$190,813
Realized gains	0	553	3,786	1,361
Realized losses	0	0	-6,589	0
Net securities (losses)/gains	$0	$553	($2,803)	$1,361

Investment_Securities_Gross_Un

Investment Securities (Gross Unrealized Loss Table) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified	securities	securities	securities
Securities available for sale	'	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$1,694,722	$213,685	$124,987
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-59,730	-1,031	-400
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	230	41	16
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	50,850	50,056	49,074
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-10,732	-11,891	-14,038
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	8	11	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,745,572	263,741	174,061
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-70,462	-12,922	-14,438
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,221,306	23,956	2,360
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-98,138	-86	-17
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	489	13	4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	987	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-14	0	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	1	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	2,222,293	23,956	2,360
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-98,152	-86	-17
US Government Agencies Debt Securities	'	'	'
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	23,864	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-1,136	'	'
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 Losses	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	23,864	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-1,136	'	'
U.S. States and political subdivisions debt securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	57,258	14,110	3,560
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-3,495	-229	-21
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	100	24	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0	0
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	0	0	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	57,258	14,110	3,560
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-3,495	-229	-21
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	226,853	6,543	2,360
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-9,243	-70	-17
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	362	12	4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	987	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-14	0	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	1	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	227,840	6,543	2,360
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-9,257	-70	-17
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	309,239	14	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-10,035	0	0
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	23	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	13	0
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	0	0	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	309,239	27	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-10,035	0	0
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	252,007	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-8,578	'	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	13	'	'
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 Losses	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	252,007	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-8,578	'	'
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	50,823	31,237	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-2,220	-406	'
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	7	3	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0	'
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	0	0	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	50,823	31,237	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-2,220	-406	'
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	44,168	'	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-1,025	'	0
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	7	'	0
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 Losses	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	44,168	'	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-1,025	'	0
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	1,073,105	133,008	121,427
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-38,995	-258	-379
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	69	9	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	389	1,581
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	0	-2	-4
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,073,105	133,397	123,008
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-38,995	-260	-383
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	1,416,238	17,413	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-68,719	-16	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	64	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 Losses	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	1,416,238	17,413	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-68,719	-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, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	'	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	'	2	0
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	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	'	2	0
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	38,938	35,316	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-1,690	-138	'
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	5	4	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0	'
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	0	0	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	38,938	35,316	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-1,690	-138	'
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	191,402	'	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-8,936	'	0
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	18	'	0
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 Losses	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	191,402	'	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-8,936	'	0
Collateralized Loan Obligations	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	165,359	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-3,295	'	'
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	26	'	'
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	165,359	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-3,295	'	'
Corporate debt securities	'	'	'
Securities available for sale	'	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0	0
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	50,850	49,652	47,493
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-10,732	-11,889	-14,034
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	8	8	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	50,850	49,652	47,493
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-10,732	-11,889	-14,034
Securities held to maturity	'	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	66,774	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-501	'	'
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	24	'	'
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 Losses	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	66,774	'	'
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	($501)	'	'

Investment_Securities_Maturiti

Investment Securities (Maturities Table) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Securities Available for Sale	'	'	'
One year or less	$55,888	'	'
Over one year through five years	2,144,204	'	'
Over five years through ten years	965,488	'	'
Over ten years	84,302	'	'
Fair Value	3,249,882	'	'
Weighted Average Yield, one year or less	3.51%	'	'
Weighted Average Yield, over one year through five years	2.30%	'	'
Weighted Average Yield, over five years through ten years	2.63%	'	'
Weighted Average Yield, over ten years	2.18%	'	'
Weighted Average Yield, Total	2.42%	'	'
Amortized Cost	3,279,732	'	'
Weighted-Average Yield	2.42%	'	'
Weighted-Average Maturity	4.8	'	'
Securities Held to Maturity	'	'	'
One year or less	47,561	'	'
Over one year through five years	1,464,821	'	'
Over five years through ten years	943,803	'	'
Over ten years	202,248	'	'
Held-to-maturity Securities, Fair Value	2,658,433	630,799	631,237
Weighted Average Yield, one year or less	1.38%	'	'
Weighted Average Yield, over one year through five years	1.66%	'	'
Weighted Average Yield, over five years through ten years	2.21%	'	'
Weighted Average Yield, over ten years	5.07%	'	'
Weighted Average Yield, Total	2.11%	'	'
Held-to-maturity	2,749,934	622,121	620,631
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,749,934	622,121	620,631
Weighted Average Yield	2.11%	'	'
Weighted-Average Maturity	5.68	'	'
US Government Agencies Debt Securities	'	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	0	'	'
Over five years through ten years	23,864	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	23,864	'	'
Held-to-maturity	23,864	'	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	25,000	'	'
Weighted Average Yield	1.43%	'	'
Weighted-Average Maturity	6.08	'	'
US Treasury Securities	'	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	5,005	'	'
Over five years through ten years	0	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	5,005	'	'
Held-to-maturity	5,005	'	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	5,000	'	'
Weighted Average Yield	0.25%	'	'
Weighted-Average Maturity	1.33	'	'
U.S. States and political subdivisions debt securities	'	'	'
Securities Available for Sale	'	'	'
One year or less	14,460	'	'
Over one year through five years	53,128	'	'
Over five years through ten years	171,184	'	'
Over ten years	33,452	'	'
Fair Value	272,224	'	'
Amortized Cost	267,470	'	'
Weighted-Average Yield	5.23%	'	'
Weighted-Average Maturity	6.98	'	'
Securities Held to Maturity	'	'	'
One year or less	47,561	'	'
Over one year through five years	47,157	'	'
Over five years through ten years	152,100	'	'
Over ten years	202,248	'	'
Held-to-maturity Securities, Fair Value	449,066	'	'
Held-to-maturity	449,066	275,061	269,020
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	453,230	270,005	262,091
Weighted Average Yield	4.54%	'	'
Weighted-Average Maturity	11.24	'	'
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities Available for Sale	'	'	'
One year or less	3,649	'	'
Over one year through five years	797,680	'	'
Over five years through ten years	198,046	'	'
Over ten years	0	'	'
Fair Value	999,375	'	'
Amortized Cost	983,255	'	'
Weighted-Average Yield	2.78%	'	'
Weighted-Average Maturity	4.1	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	137,350	'	'
Over five years through ten years	233,120	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	370,470	'	'
Held-to-maturity	370,470	'	'
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	377,980	'	'
Weighted Average Yield	1.87%	'	'
Weighted-Average Maturity	5.81	'	'
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities Available for Sale	'	'	'
One year or less	17,085	'	'
Over one year through five years	5,109	'	'
Over five years through ten years	33,738	'	'
Over ten years	0	'	'
Fair Value	55,932	'	'
Amortized Cost	58,129	'	'
Weighted-Average Yield	2.10%	'	'
Weighted-Average Maturity	4.29	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	15,120	'	'
Over five years through ten years	34,046	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	49,166	'	'
Held-to-maturity	49,166	33,977	33,941
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	50,179	33,165	33,149
Weighted Average Yield	1.74%	'	'
Weighted-Average Maturity	5.81	'	'
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'	'	'
Securities Available for Sale	'	'	'
One year or less	7,125	'	'
Over one year through five years	1,204,551	'	'
Over five years through ten years	294,030	'	'
Over ten years	0	'	'
Fair Value	1,505,706	'	'
Amortized Cost	1,538,991	'	'
Weighted-Average Yield	1.85%	'	'
Weighted-Average Maturity	4.26	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	1,088,688	'	'
Over five years through ten years	366,564	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	1,455,252	'	'
Held-to-maturity	1,455,252	124,080	129,661
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	1,523,792	123,563	129,265
Weighted Average Yield	1.57%	'	'
Weighted-Average Maturity	4.6	'	'
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'	'	'
Securities Available for Sale	'	'	'
One year or less	1	'	'
Over one year through five years	8	'	'
Over five years through ten years	0	'	'
Over ten years	0	'	'
Fair Value	9	'	'
Amortized Cost	9	'	'
Weighted-Average Yield	3.68%	'	'
Weighted-Average Maturity	1.37	'	'
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	71,890	'	'
Over five years through ten years	25,264	'	'
Over ten years	0	'	'
Fair Value	97,154	'	'
Amortized Cost	98,440	'	'
Weighted-Average Yield	1.80%	'	'
Weighted-Average Maturity	4.37	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	97,014	'	'
Over five years through ten years	114,460	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	211,474	'	'
Held-to-maturity	211,474	99,696	100,015
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	220,410	98,924	98,961
Weighted Average Yield	2.26%	'	'
Weighted-Average Maturity	5.41	'	'
Collateralized Loan Obligations	'	'	'
Securities Available for Sale	'	'	'
One year or less	13,568	'	'
Over one year through five years	11,838	'	'
Over five years through ten years	243,226	'	'
Over ten years	0	'	'
Fair Value	268,632	'	'
Amortized Cost	271,856	'	'
Weighted-Average Yield	2.14%	'	'
Weighted-Average Maturity	6.37	'	'
Corporate debt securities	'	'	'
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	50,850	'	'
Fair Value	50,850	'	'
Amortized Cost	61,582	'	'
Weighted-Average Yield	0.97%	'	'
Weighted-Average Maturity	14.06	'	'
Securities Held to Maturity	'	'	'
One year or less	0	'	'
Over one year through five years	74,487	'	'
Over five years through ten years	19,649	'	'
Over ten years	0	'	'
Held-to-maturity Securities, Fair Value	94,136	'	'
Held-to-maturity	94,136	97,985	98,600
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$94,343	$96,464	$97,165
Weighted Average Yield	2.19%	'	'
Weighted-Average Maturity	4.29	'	'

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details Textual) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]	'	'	'
Maximum portfolio concentration in municipal securities per corporate investment policy	20.00%	'	'
Revenue bonds, number owned by corporation	1	'	'
Revenue bond, fair value	$600,000	'	'
Revenue bond, amortized cost	500,000	'	'
General obligation bonds, fair market value adjustment	600,000	'	'
Investment Securities	'	'	'
Other investment securities pledged	$3,400,000,000	$1,600,000,000	$1,900,000,000
Amount of municipal securities with a combined individual state to total municipal outstanding equal to or less than, per corporate policy	25.00%	'	'

Investment_Securities_Investme1

Investment Securities Investment Securities (Schedule of General Obligation Bonds) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	900	546	594
General obligation bonds, average issue size, fair value	$801	$994	$888
General obligation bonds, amortized cost	720,701	522,699	503,527
General obligation bonds, fair value	721,291	542,653	527,437
MICHIGAN	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	178	127	129
General obligation bonds, average issue size, fair value	823	1,167	1,161
General obligation bonds, amortized cost	140,651	144,789	144,573
General obligation bonds, fair value	146,448	148,264	149,780
OHIO	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	155	42	57
General obligation bonds, average issue size, fair value	940	1,366	894
General obligation bonds, amortized cost	146,841	55,207	48,519
General obligation bonds, fair value	145,656	57,365	50,964
ILLINOIS	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	68	55	53
General obligation bonds, average issue size, fair value	1,017	970	961
General obligation bonds, amortized cost	69,302	51,932	49,384
General obligation bonds, fair value	69,149	53,348	50,925
TEXAS	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	69	53	55
General obligation bonds, average issue size, fair value	774	931	867
General obligation bonds, amortized cost	54,428	47,613	45,658
General obligation bonds, fair value	53,427	49,326	47,698
WISCONSIN	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	83	28	31
General obligation bonds, average issue size, fair value	637	1,096	973
General obligation bonds, amortized cost	51,981	28,572	27,857
General obligation bonds, fair value	52,856	30,687	30,155
PENNSYLVANIA	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	56	40	39
General obligation bonds, average issue size, fair value	889	719	735
General obligation bonds, amortized cost	52,039	27,348	26,794
General obligation bonds, fair value	49,761	28,756	28,646
MINNESOTA	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	46	33	44
General obligation bonds, average issue size, fair value	658	856	632
General obligation bonds, amortized cost	30,115	26,541	26,189
General obligation bonds, fair value	30,278	28,232	27,817
WASHINGTON	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	31	22	24
General obligation bonds, average issue size, fair value	943	1,233	1,139
General obligation bonds, amortized cost	29,594	26,104	26,150
General obligation bonds, fair value	29,222	27,130	27,331
NEW JERSEY	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	38	22	23
General obligation bonds, average issue size, fair value	726	907	809
General obligation bonds, amortized cost	27,130	18,976	17,505
General obligation bonds, fair value	27,604	19,958	18,598
MISSOURI	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	20	10	15
General obligation bonds, average issue size, fair value	978	1,482	1,025
General obligation bonds, amortized cost	19,303	13,809	14,241
General obligation bonds, fair value	19,552	14,815	15,378
NEW YORK	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	22	18	18
General obligation bonds, average issue size, fair value	590	639	583
General obligation bonds, amortized cost	13,082	11,027	9,980
General obligation bonds, fair value	12,970	11,507	10,497
CALIFORNIA	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	18	11	16
General obligation bonds, average issue size, fair value	604	930	648
General obligation bonds, amortized cost	10,666	9,734	9,747
General obligation bonds, fair value	10,873	10,231	10,371
Other states	'	'	'
general obligation bonds [Line Items]	'	'	'
General Obligation Bonds number of issuers	116	85	90
General obligation bonds, average issue size, fair value	634	742	659
General obligation bonds, amortized cost	75,569	61,047	56,930
General obligation bonds, fair value	$73,495	$63,034	$59,277

Loans_Schedule_of_Accounts_Not1

Loans Schedule of Accounts, Notes, Loans and Financing Receivables (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	$8,813,656,000	$6,584,926,000	$6,359,419,000
Loans and Leases Receivable, Gross, Consumer, Mortgage	1,007,687,000	506,751,000	502,841,000
Loans and Leases Receivable, Gross, Consumer, Installment, Other	2,733,754,000	1,336,447,000	1,329,441,000
Loans and Leases Receivable, Gross, Consumer, Home Equity	1,299,063,000	923,303,000	912,921,000
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	145,113,000	146,387,000	143,918,000
Loans and Leases Receivable, Gross, Consumer, Lease Financing	199,907,000	139,236,000	110,938,000
FDIC Indemnification Asset	69,986,000	113,734,000	131,871,000
Loans	14,269,166,000	9,750,784,000	9,491,349,000
Allowance for loan losses	-143,835,000	-142,197,000	-142,586,000
Net loans	14,125,331,000	9,608,587,000	9,348,763,000
FirstBank Loans	51,900,000	54,200,000	56,000,000
Originated Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	6,420,369,000	5,866,489,000	5,511,678,000
Loans and Leases Receivable, Gross, Consumer, Mortgage	487,283,000	445,211,000	439,062,000
Loans and Leases Receivable, Gross, Consumer, Installment, Other	1,647,095,000	1,328,258,000	1,321,081,000
Loans and Leases Receivable, Gross, Consumer, Home Equity	889,372,000	806,078,000	789,743,000
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	145,113,000	146,387,000	143,918,000
Loans and Leases Receivable, Gross, Consumer, Lease Financing	199,907,000	139,236,000	110,938,000
Loans	9,789,139,000	8,731,659,000	8,316,420,000
Allowance for loan losses	-98,291,000	-98,942,000	-98,942,000
Net loans	9,690,848,000	8,632,717,000	8,217,478,000
Acquired Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	1,971,062,000	'	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	467,608,000	'	'
Loans and Leases Receivable, Gross, Consumer, Installment, Other	1,080,298,000	'	'
Loans and Leases Receivable, Gross, Consumer, Home Equity	306,783,000	'	'
Loans	3,825,751,000	'	'
Allowance for loan losses	0	'	'
Net loans	3,825,751,000	'	'
Covered Loans	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Loans and Leases Receivable, Gross, Commercial	422,225,000	718,437,000	847,741,000
Loans and Leases Receivable, Gross, Consumer, Mortgage	52,796,000	61,540,000	63,779,000
Loans and Leases Receivable, Gross, Consumer, Installment, Other	6,361,000	8,189,000	8,360,000
Loans and Leases Receivable, Gross, Consumer, Home Equity	102,908,000	117,225,000	123,178,000
FDIC Indemnification Asset	'	113,734,000	131,871,000
Loans and Leases Receivable, Gross, Carrying Amount, Covered	654,276,000	1,019,125,000	1,174,929,000
Covered Certain Loans Acquired in Transfer not Accounted for as Debt Securities Allowance for Loan Losses	-45,544,000	-43,255,000	-43,644,000
Net loans	$608,732,000	$975,870,000	$1,131,285,000

Loans_Changes_in_Loss_Share_Re1

Loans Changes in Loss Share Receivable Associated with Covered Loans (Details) (Loss Share Receivable, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Loss Share Receivable	'	'	'	'
Changes in Loss Share Receivable [Roll Forward]	'	'	'	'
Balance at beginning of period	$83,910	$152,615	$113,734	$205,664
Accretion	-5,226	-8,401	-19,327	-26,935
Increase due to impairment	1,032	1,484	8,890	12,601
FDIC reimbursement	-7,284	-12,597	-23,231	-50,678
Covered loans paid in full	-2,446	-1,229	-10,080	-8,780
Balance at end of period	$69,986	$131,872	$69,986	$131,872

Loans_Changes_in_Carrying_Amou1

Loans Changes in Carrying Amount of Accretable Yield for Purchased Loans (Details) (USD $)	3 Months Ended		9 Months Ended						3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2013	Apr. 12, 2013
	Covered Loans	Covered Loans	Covered Loans	Covered Loans	Covered Loans	Covered Loans	Covered Loans	Covered Loans	Acquired Impaired	Acquired Impaired
									Acquired Loans	Acquired Loans
Changes in Carrying Amount of Accretable Yield for Purchased Loans [Line Items]	'	'	'	'	'	'	'	'	'	'
Contractual required payments receivable	$811,319	$1,333,127	$811,319	$1,333,127	'	'	'	'	$907,626	'
Changes in the carrying amount of accretable yield for purchased loans [Roll Forward]	'	'	'	'	'	'	'	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	79,138	128,024	79,138	128,024	81,758	113,288	147,576	176,736	104,210	118,459
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions	'	'	'	'	'	'	'	'	0	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	537,257	964,314	762,386	1,128,978	'	'	'	'	'	757,029
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	14,056	23,631	51,327	75,478	'	'	'	'	-8,827	'
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Accretion	14,056	23,631	51,327	75,478	'	'	'	'	8,827	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	12,745	6,008	28,726	30,814	'	'	'	'	'	'
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Additions	'	'	'	'	'	'	'	'	0	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities F D I C Payments Received under Loss Sharing Agreement	103,514	96,593	365,914	313,104	'	'	'	'	-92,536	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	1,309	1,929	11,549	4,048	'	'	'	'	-5,422	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	447,799	891,352	447,799	891,352	'	'	'	'	673,320	757,029
Nonaccretable difference	-284,382	-313,751	-284,382	-313,751	'	'	'	'	-130,096	'
Expected cash flows	526,937	1,019,376	526,937	1,019,376	'	'	'	'	777,530	'
Accretable yield	($79,138)	($128,024)	($79,138)	($128,024)	'	'	'	'	($104,210)	'

Loans_Reconciliation_of_Carryi1

Loans Reconciliation of Carrying Amount of Acquired Impaired Loans (Details) (Covered Loans, USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Covered Loans	'	'	'	'	'	'
Reconciliation of Carrying Amount of Acquired Impaired Loans [Line Items]	'	'	'	'	'	'
Contractual required payments receivable	$811,319	'	'	$1,333,127	'	'
Nonaccretable difference	-284,382	'	'	-313,751	'	'
Expected cash flows	526,937	'	'	1,019,376	'	'
Accretable yield	-79,138	'	'	-128,024	'	'
Carrying balance	$447,799	$537,257	$762,386	$891,352	$964,314	$1,128,978

Loans_Past_Due_Financing_Recei1

Loans Past Due Financing Receivables (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Consumer Loans Guaranteed by Government	$2,900,000	$3,400,000	$3,100,000
Originated Loans	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	32,278,000	36,548,000	38,293,000
60 to 89 Days Past Due	13,398,000	13,635,000	13,886,000
Equal to Greater than 90 Days Past Due	30,471,000	28,754,000	32,534,000
Total Past Due	76,147,000	78,937,000	84,713,000
Current	9,712,992,000	8,652,722,000	8,231,707,000
Total Loans	9,789,139,000	8,731,659,000	8,316,420,000
90 Days Past Due and Still Accruing	12,452,000	9,417,000	9,691,000
Nonaccrual Loans	35,588,000	36,687,000	50,311,000
Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	3,571,000	3,814,000	8,781,000
60 to 89 Days Past Due	3,889,000	1,986,000	2,795,000
Equal to Greater than 90 Days Past Due	4,931,000	3,571,000	1,519,000
Total Past Due	12,391,000	9,371,000	13,095,000
Current	3,851,704,000	3,297,155,000	3,036,136,000
Total Loans	3,864,095,000	3,306,526,000	3,049,231,000
90 Days Past Due and Still Accruing	201,000	104,000	57,000
Nonaccrual Loans	5,234,000	5,255,000	9,995,000
Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	2,794,000	4,181,000	3,197,000
60 to 89 Days Past Due	1,414,000	4,530,000	3,856,000
Equal to Greater than 90 Days Past Due	8,976,000	11,535,000	16,876,000
Total Past Due	13,184,000	20,246,000	23,929,000
Current	2,214,228,000	2,204,170,000	2,129,413,000
Total Loans	2,227,412,000	2,224,416,000	2,153,342,000
90 Days Past Due and Still Accruing	1,047,000	382,000	1,862,000
Nonaccrual Loans	13,821,000	15,780,000	20,574,000
Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	328,862,000	335,547,000	309,105,000
Originated Loans | Commercial Construction Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	0	981,000	116,000
60 to 89 Days Past Due	0	0	0
Equal to Greater than 90 Days Past Due	24,000	597,000	853,000
Total Past Due	24,000	1,578,000	969,000
Current	328,838,000	333,969,000	308,136,000
Total Loans	328,862,000	335,547,000	309,105,000
90 Days Past Due and Still Accruing	0	0	0
Nonaccrual Loans	85,000	731,000	923,000
Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	726,000	6,000	7,000
60 to 89 Days Past Due	0	0	0
Equal to Greater than 90 Days Past Due	0	0	0
Total Past Due	726,000	6,000	7,000
Current	199,181,000	139,230,000	110,931,000
Total Loans	199,907,000	139,236,000	110,938,000
90 Days Past Due and Still Accruing	0	0	0
Nonaccrual Loans	0	0	0
Originated Loans | Installment	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	9,825,000	11,722,000	8,934,000
60 to 89 Days Past Due	3,392,000	3,193,000	3,430,000
Equal to Greater than 90 Days Past Due	5,378,000	5,639,000	4,834,000
Total Past Due	18,595,000	20,554,000	17,198,000
Current	1,628,500,000	1,307,704,000	1,303,883,000
Total Loans	1,647,095,000	1,328,258,000	1,321,081,000
90 Days Past Due and Still Accruing	4,506,000	4,942,000	4,439,000
Nonaccrual Loans	3,894,000	2,914,000	3,267,000
Originated Loans | Home equity lines	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	1,094,000	1,584,000	1,840,000
60 to 89 Days Past Due	498,000	880,000	472,000
Equal to Greater than 90 Days Past Due	1,118,000	1,227,000	1,411,000
Total Past Due	2,710,000	3,691,000	3,723,000
Current	886,662,000	802,387,000	786,020,000
Total Loans	889,372,000	806,078,000	789,743,000
90 Days Past Due and Still Accruing	500,000	475,000	541,000
Nonaccrual Loans	2,038,000	1,557,000	1,858,000
Originated Loans | Consumer Credit Card Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	781,000	969,000	991,000
60 to 89 Days Past Due	434,000	558,000	556,000
Equal to Greater than 90 Days Past Due	700,000	954,000	808,000
Total Past Due	1,915,000	2,481,000	2,355,000
Current	143,198,000	143,906,000	141,563,000
Total Loans	145,113,000	146,387,000	143,918,000
90 Days Past Due and Still Accruing	365,000	438,000	393,000
Nonaccrual Loans	422,000	598,000	525,000
Originated Loans | Consumer Residential Mortgages Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	13,487,000	13,291,000	14,427,000
60 to 89 Days Past Due	3,771,000	2,488,000	2,777,000
Equal to Greater than 90 Days Past Due	9,344,000	5,231,000	6,233,000
Total Past Due	26,602,000	21,010,000	23,437,000
Current	460,681,000	424,201,000	415,625,000
Total Loans	487,283,000	445,211,000	439,062,000
90 Days Past Due and Still Accruing	5,833,000	3,076,000	2,399,000
Nonaccrual Loans	10,094,000	9,852,000	13,169,000
Acquired Loans	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	41,455,000	'	'
60 to 89 Days Past Due	10,198,000	'	'
Equal to Greater than 90 Days Past Due	45,696,000	'	'
Total Past Due	97,349,000	'	'
Current	3,728,402,000	'	'
Total Loans	3,825,751,000	'	'
90 Days Past Due and Still Accruing	2,967,000	'	'
Nonaccrual Loans	9,899,000	'	'
Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	5,379,000	'	'
60 to 89 Days Past Due	331,000	'	'
Equal to Greater than 90 Days Past Due	3,239,000	'	'
Total Past Due	8,949,000	'	'
Current	974,271,000	'	'
Total Loans	983,220,000	'	'
90 Days Past Due and Still Accruing	0	'	'
Nonaccrual Loans	5,301,000	'	'
Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	3,068,000	'	'
60 to 89 Days Past Due	2,816,000	'	'
Equal to Greater than 90 Days Past Due	26,766,000	'	'
Total Past Due	32,650,000	'	'
Current	937,010,000	'	'
Total Loans	969,660,000	'	'
90 Days Past Due and Still Accruing	0	'	'
Nonaccrual Loans	691,000	'	'
Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	18,182,000	'	'
Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Acquired Loans | Installment	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	10,883,000	'	'
60 to 89 Days Past Due	2,866,000	'	'
Equal to Greater than 90 Days Past Due	1,446,000	'	'
Total Past Due	15,195,000	'	'
Current	1,065,103,000	'	'
Total Loans	1,080,298,000	'	'
90 Days Past Due and Still Accruing	0	'	'
Nonaccrual Loans	954,000	'	'
Acquired Loans | Home equity lines	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	3,779,000	'	'
60 to 89 Days Past Due	982,000	'	'
Equal to Greater than 90 Days Past Due	3,522,000	'	'
Total Past Due	8,283,000	'	'
Current	298,500,000	'	'
Total Loans	306,783,000	'	'
90 Days Past Due and Still Accruing	0	'	'
Nonaccrual Loans	2,184,000	'	'
Acquired Loans | Consumer Residential Mortgages Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	18,346,000	'	'
60 to 89 Days Past Due	3,203,000	'	'
Equal to Greater than 90 Days Past Due	10,723,000	'	'
Total Past Due	32,272,000	'	'
Current	435,336,000	'	'
Total Loans	467,608,000	'	'
90 Days Past Due and Still Accruing	2,967,000	'	'
Nonaccrual Loans	769,000	'	'
Covered Loans	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Covered Loans Loss Share Receivable	'	113,700,000	131,900,000
30 to 59 Days Past Due	15,893,000	17,184,000	21,996,000
60 to 89 Days Past Due	7,089,000	25,086,000	25,573,000
Equal to Greater than 90 Days Past Due	164,075,000	240,864,000	263,019,000
Total Past Due	187,057,000	283,134,000	310,588,000
Current	397,233,000	622,257,000	732,470,000
Total Loans	584,290,000	905,391,000	1,043,058,000
Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	3,729,000	931,000	2,962,000
60 to 89 Days Past Due	730,000	981,000	973,000
Equal to Greater than 90 Days Past Due	12,493,000	24,111,000	27,035,000
Total Past Due	16,952,000	26,023,000	30,970,000
Current	66,287,000	102,486,000	131,721,000
Total Loans	83,239,000	128,509,000	162,691,000
Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	1,299,000	4,130,000	4,965,000
60 to 89 Days Past Due	5,672,000	15,019,000	21,919,000
Equal to Greater than 90 Days Past Due	117,839,000	172,444,000	184,067,000
Total Past Due	124,810,000	191,593,000	210,951,000
Current	184,087,000	348,002,000	412,323,000
Total Loans	308,897,000	539,595,000	623,274,000
Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	30,089,000	50,333,000	61,776,000
Covered Loans | Commercial Construction Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	943,000	589,000	0
60 to 89 Days Past Due	0	7,925,000	998,000
Equal to Greater than 90 Days Past Due	25,996,000	34,314,000	41,325,000
Total Past Due	26,939,000	42,828,000	42,323,000
Current	3,150,000	7,505,000	19,453,000
Total Loans	30,089,000	50,333,000	61,776,000
Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Covered Loans | Installment	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	57,000	1,000	2,289,000
60 to 89 Days Past Due	4,000	65,000	0
Equal to Greater than 90 Days Past Due	0	21,000	35,000
Total Past Due	61,000	87,000	2,324,000
Current	6,300,000	8,102,000	6,036,000
Total Loans	6,361,000	8,189,000	8,360,000
Covered Loans | Home equity lines	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	1,532,000	1,528,000	1,398,000
60 to 89 Days Past Due	22,000	654,000	435,000
Equal to Greater than 90 Days Past Due	1,781,000	2,211,000	1,981,000
Total Past Due	3,335,000	4,393,000	3,814,000
Current	99,574,000	112,832,000	119,364,000
Total Loans	102,909,000	117,225,000	123,178,000
Covered Loans | Consumer Residential Mortgages Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30 to 59 Days Past Due	8,333,000	10,005,000	10,382,000
60 to 89 Days Past Due	661,000	442,000	1,248,000
Equal to Greater than 90 Days Past Due	5,966,000	7,763,000	8,576,000
Total Past Due	14,960,000	18,210,000	20,206,000
Current	37,835,000	43,330,000	43,573,000
Total Loans	52,795,000	61,540,000	63,779,000
Grade 1 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	32,144,000	42,211,000	37,327,000
Grade 1 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	1,216,000	0	0
Grade 1 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 1 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	9,932,000	13,119,000	13,785,000
Grade 1 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 1 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 1 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 1 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 1 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 1 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 1 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 1 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 2 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	82,906,000	114,480,000	105,504,000
Grade 2 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	3,711,000	3,138,000	3,170,000
Grade 2 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 2 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	3,173,000	179,000	190,000
Grade 2 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	96,000	'	'
Grade 2 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 2 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 2 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 2 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	996,000	1,526,000	1,742,000
Grade 2 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 2 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 2 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 3 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	867,186,000	661,692,000	573,561,000
Grade 3 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	368,918,000	254,749,000	278,017,000
Grade 3 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	27,041,000	17,652,000	19,312,000
Grade 3 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	29,631,000	20,042,000	8,857,000
Grade 3 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	27,827,000	'	'
Grade 3 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	29,123,000	'	'
Grade 3 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 3 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 3 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	92,000
Grade 3 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	449,000
Grade 3 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 3 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 4 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	2,796,101,000	2,408,669,000	2,215,336,000
Grade 4 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	1,770,768,000	1,845,686,000	1,738,257,000
Grade 4 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	300,154,000	311,271,000	282,438,000
Grade 4 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	152,778,000	104,037,000	87,259,000
Grade 4 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	849,858,000	'	'
Grade 4 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	744,362,000	'	'
Grade 4 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	18,182,000	'	'
Grade 4 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 4 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	45,557,000	73,480,000	91,101,000
Grade 4 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	116,056,000	214,987,000	240,630,000
Grade 4 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	601,000	476,000	494,000
Grade 4 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 5 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	48,912,000	44,969,000	60,803,000
Grade 5 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	30,502,000	53,675,000	54,655,000
Grade 5 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	323,000	3,057,000	2,893,000
Grade 5 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	3,325,000	1,561,000	514,000
Grade 5 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	60,968,000	'	'
Grade 5 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	102,256,000	'	'
Grade 5 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 5 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 5 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	624,000	3,215,000	3,844,000
Grade 5 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	15,364,000	30,708,000	39,883,000
Grade 5 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	943,000	1,331,000	0
Grade 5 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 6 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	36,846,000	34,505,000	56,700,000
Grade 6 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	52,297,000	67,168,000	79,243,000
Grade 6 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	1,344,000	3,567,000	4,462,000
Grade 6 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	1,068,000	298,000	333,000
Grade 6 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	44,471,000	'	'
Grade 6 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	93,919,000	'	'
Grade 6 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 6 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 6 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	33,957,000	47,468,000	61,192,000
Grade 6 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	176,286,000	292,158,000	340,063,000
Grade 6 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	26,401,000	45,838,000	58,586,000
Grade 6 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 7 | Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 7 | Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 7 | Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 7 | Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	0	0
Grade 7 | Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 7 | Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 7 | Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 7 | Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	0	'	'
Grade 7 | Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	2,105,000	2,820,000	4,720,000
Grade 7 | Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	1,191,000	1,742,000	2,249,000
Grade 7 | Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	2,144,000	2,688,000	2,696,000
Grade 7 | Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Total Loans	$0	$0	$0

Loans_Financing_Receivables_Cr1

Loans Financing Receivables Credit Quality Indicators (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Originated Loans	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	$9,789,139	$8,731,659	$8,316,420
Originated Loans | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	3,864,095	3,306,526	3,049,231
Originated Loans | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	2,227,412	2,224,416	2,153,342
Originated Loans | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	328,862	335,547	309,105
Originated Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	199,907	139,236	110,938
Originated Loans | Grade 1 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	32,144	42,211	37,327
Originated Loans | Grade 1 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	1,216	0	0
Originated Loans | Grade 1 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Originated Loans | Grade 1 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	9,932	13,119	13,785
Originated Loans | Grade 2 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	82,906	114,480	105,504
Originated Loans | Grade 2 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	3,711	3,138	3,170
Originated Loans | Grade 2 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Originated Loans | Grade 2 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	3,173	179	190
Originated Loans | Grade 3 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	867,186	661,692	573,561
Originated Loans | Grade 3 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	368,918	254,749	278,017
Originated Loans | Grade 3 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	27,041	17,652	19,312
Originated Loans | Grade 3 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	29,631	20,042	8,857
Originated Loans | Grade 4 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	2,796,101	2,408,669	2,215,336
Originated Loans | Grade 4 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	1,770,768	1,845,686	1,738,257
Originated Loans | Grade 4 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	300,154	311,271	282,438
Originated Loans | Grade 4 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	152,778	104,037	87,259
Originated Loans | Grade 5 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	48,912	44,969	60,803
Originated Loans | Grade 5 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	30,502	53,675	54,655
Originated Loans | Grade 5 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	323	3,057	2,893
Originated Loans | Grade 5 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	3,325	1,561	514
Originated Loans | Grade 6 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	36,846	34,505	56,700
Originated Loans | Grade 6 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	52,297	67,168	79,243
Originated Loans | Grade 6 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	1,344	3,567	4,462
Originated Loans | Grade 6 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	1,068	298	333
Originated Loans | Grade 7 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Originated Loans | Grade 7 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Originated Loans | Grade 7 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Originated Loans | Grade 7 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Acquired Loans	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	3,825,751	'	'
Acquired Loans | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	983,220	'	'
Acquired Loans | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	969,660	'	'
Acquired Loans | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	18,182	'	'
Acquired Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 1 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 1 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 1 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 1 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 2 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	96	'	'
Acquired Loans | Grade 2 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 2 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 2 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 3 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	27,827	'	'
Acquired Loans | Grade 3 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	29,123	'	'
Acquired Loans | Grade 3 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 3 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 4 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	849,858	'	'
Acquired Loans | Grade 4 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	744,362	'	'
Acquired Loans | Grade 4 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	18,182	'	'
Acquired Loans | Grade 4 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 5 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	60,968	'	'
Acquired Loans | Grade 5 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	102,256	'	'
Acquired Loans | Grade 5 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 5 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 6 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	44,471	'	'
Acquired Loans | Grade 6 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	93,919	'	'
Acquired Loans | Grade 6 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 6 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 7 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 7 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 7 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Acquired Loans | Grade 7 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	'	'
Covered Loans	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	584,290	905,391	1,043,058
Covered Loans | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	83,239	128,509	162,691
Covered Loans | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	308,897	539,595	623,274
Covered Loans | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	30,089	50,333	61,776
Covered Loans | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 1 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 1 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 1 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 1 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 2 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	996	1,526	1,742
Covered Loans | Grade 2 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 2 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 2 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 3 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	92
Covered Loans | Grade 3 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	449
Covered Loans | Grade 3 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 3 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 4 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	45,557	73,480	91,101
Covered Loans | Grade 4 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	116,056	214,987	240,630
Covered Loans | Grade 4 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	601	476	494
Covered Loans | Grade 4 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 5 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	624	3,215	3,844
Covered Loans | Grade 5 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	15,364	30,708	39,883
Covered Loans | Grade 5 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	943	1,331	0
Covered Loans | Grade 5 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 6 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	33,957	47,468	61,192
Covered Loans | Grade 6 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	176,286	292,158	340,063
Covered Loans | Grade 6 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	26,401	45,838	58,586
Covered Loans | Grade 6 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	0	0	0
Covered Loans | Grade 7 | C&I	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	2,105	2,820	4,720
Covered Loans | Grade 7 | CRE	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	1,191	1,742	2,249
Covered Loans | Grade 7 | Construction	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	2,144	2,688	2,696
Covered Loans | Grade 7 | Commercial Leases Financing Receivable	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'
Financing Receivable, Net	$0	$0	$0

Loans_Details_Narrative_Detail

Loans Details Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Nonaccrual Non-reaffirmed Bankruptcies	$8,800,000	'	$8,800,000	'	$7,700,000
Provision for loan and lease losses - acquired loans	2,033,000	0	2,033,000	0	'
Consumer Loans Guaranteed by Government	2,900,000	3,100,000	2,900,000	3,100,000	3,400,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	7,500,000	-5,800,000	7,500,000	-5,800,000	-6,500,000
Loans Due Ninety Days or More or on Nonaccrual Status	'	'	'90 days	'	'
Days past due for nonaccrual status credit card loans	'	'	'120 days	'	'
Loans	14,269,166,000	9,491,349,000	14,269,166,000	9,491,349,000	9,750,784,000
Acquired Loans	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	4,200,000,000	'	4,200,000,000	'	'
Covered Loans	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Covered Loans Loss Share Receivable	'	131,900,000	'	131,900,000	113,700,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	2,855,000	7,698,000	19,009,000	28,177,000	'
Provision for Loan Lease and Other Losses Covered	1,823,000	6,214,000	10,119,000	15,576,000	'
Covered Loans	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	12,745,000	6,008,000	28,726,000	30,814,000	'
Covered Loans | Covered Loans	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Covered Loans Loss Share Receivable	69,986,000	'	69,986,000	'	'
Acquired Loans	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	$3,825,751,000	'	$3,825,751,000	'	'

Loans_Acquired_impaired_and_no1

Loans Acquired impaired and non-impaired loans (Details) (USD $)	Apr. 12, 2013
In Thousands, unless otherwise specified
Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	$824,608
Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	3,799,685
Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	4,624,293
C&I | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	95,188
C&I | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	1,664,912
C&I | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	1,760,100
CRE | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	380,039
CRE | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	359,066
CRE | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	739,105
Construction | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	13,399
Construction | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	17,135
Construction | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	30,534
Residential mortgages | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	233,007
Residential mortgages | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	279,736
Residential mortgages | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	512,743
Installment | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	54,377
Installment | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	1,165,235
Installment | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	1,219,612
Home equity lines | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	48,598
Home equity lines | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	313,601
Home equity lines | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	362,199
Consumer Loan | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	335,982
Consumer Loan | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	1,758,572
Consumer Loan | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	2,094,554
Commercial Loan | Acquired Impaired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	488,626
Commercial Loan | Acquired performing loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	2,041,113
Commercial Loan | Acquired Loans	'
Acquired Impaired and Non-Impaired Loans at Acquisition Date [Line Items]	'
Loans	$2,529,739

Loans_Changes_in_Carrying_Amou2

Loans Changes in Carrying Amount of Accretable Yield for Purchased Loans at Acquisition Date (Details) (USD $)	Apr. 12, 2013
In Thousands, unless otherwise specified
Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	$824,608
Contractual required payments receivable	1,086,503
Nonaccretable difference	-130,096
Expected cash flows	956,407
Accretable yield	-131,799
Carrying balance	824,608
Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	3,799,685
Contractual required payments receivable	4,020,812
Nonaccretable difference	0
Expected cash flows	4,020,812
Accretable yield	-221,127
Carrying balance	3,799,685
Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	4,624,293
Contractual required payments receivable	5,107,315
Nonaccretable difference	-130,096
Expected cash flows	4,977,219
Accretable yield	-352,926
Carrying balance	4,624,293
Commercial Loan | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	488,626
Commercial Loan | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	2,041,113
Commercial Loan | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	2,529,739
Consumer Loan | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	335,982
Consumer Loan | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	1,758,572
Consumer Loan | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	2,094,554
Commercial and Industrial Financing Receivable | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	95,188
Commercial and Industrial Financing Receivable | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	1,664,912
Commercial and Industrial Financing Receivable | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	1,760,100
Commercial Real Estate Other Receivable | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	380,039
Commercial Real Estate Other Receivable | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	359,066
Commercial Real Estate Other Receivable | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	739,105
Construction | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	13,399
Construction | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	17,135
Construction | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	30,534
Residential mortgages | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	233,007
Residential mortgages | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	279,736
Residential mortgages | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	512,743
Consumer Installment Financing Receivable | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	54,377
Consumer Installment Financing Receivable | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	1,165,235
Consumer Installment Financing Receivable | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	1,219,612
Consumer Home Equity Lines Financing Receivable | Acquired Impaired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	48,598
Consumer Home Equity Lines Financing Receivable | Acquired performing loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	313,601
Consumer Home Equity Lines Financing Receivable | Acquired Loans	'
Reconciliaiton of carrying amount of acquired loans [Line Items]	'
Loans	$362,199

Loans_Changes_in_the_Carrying_

Loans Changes in the Carrying Amount of Accretable Yield for Acquired Impaired Loans (Details) (Acquired Impaired, Acquired Loans, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Apr. 12, 2013
Acquired Impaired | Acquired Loans	'	'
Changes in the Carrying Amount of Accretable Yield for Acquired Impaired Loans [Line Items]	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$104,210	$118,459
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	673,320	757,029
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions	0	'
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Additions	0	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	8,827	'
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Accretion	8,827	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	-5,422	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities F D I C Payments Received under Loss Sharing Agreement	$92,536	'

Allowance_for_Loan_Losses_Deta

Allowance for Loan Losses Details Textual (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'	'	'
Provision for loan and lease losses - acquired loans	$2,033,000	$0	$2,033,000	$0	'	'	'	'
Loan Commitments	5,578,342,000	4,094,181,000	5,578,342,000	4,094,181,000	'	4,151,541,000	'	'
Minimum Non Performing Substandard Loans Outstanding for Allowance for Credit Losses	300,000	'	300,000	'	'	'	'	'
Minimum Non Performing Substandard Doubtful Loans Outstanding for Allowance for Credit Losses	100,000	'	100,000	'	'	'	'	'
Nonaccrual Non-reaffirmed Bankruptcies	8,800,000	'	8,800,000	'	'	7,700,000	'	'
Covered Loans	'	'	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'	'	'
Loans and Leases Receivable, Allowance, Covered	45,544,000	43,644,000	45,544,000	43,644,000	49,069,000	43,255,000	42,606,000	36,417,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	2,855,000	7,698,000	19,009,000	28,177,000	'	'	'	'
Allowance for Loan and Lease Losses, Write-offs	-6,380,000	-6,660,000	-16,720,000	-20,950,000	'	'	'	'
Benefit Attributable to FDIC Loss Share Agreements	-1,032,000	-1,484,000	-8,890,000	-12,601,000	'	'	'	'
Provision for Loan Lease and Other Losses Covered	1,823,000	6,214,000	10,119,000	15,576,000	'	'	'	'
Loans with No Related Allowance	'	'	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'	'	'
Loan Commitments	$200,000	'	$200,000	'	'	'	'	'

Allowance_for_Loan_Losses_Sche

Allowance for Loan Losses Schedule of Credit Losses Related to Financing Receivables, Current and Non-Current (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Provision for Loan, Lease, and Other Losses	$6,379	$16,179	$23,634	$42,436	'	'	'	'
Originated Loans	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	4,136	8,444	4,136	8,444	'	5,004	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	94,155	90,498	94,155	90,498	'	93,938	'	'
Financing Receivable, Allowance for Credit Losses	98,291	98,942	98,291	98,942	98,645	98,942	103,849	107,699
Financing Receivable, Individually Evaluated for Impairment	89,901	108,378	89,901	108,378	'	96,371	'	'
Financing Receivable, Collectively Evaluated for Impairment	9,699,238	8,208,042	9,699,238	8,208,042	'	8,635,288	'	'
Financing Receivable, Net	9,789,139	8,316,420	9,789,139	8,316,420	'	8,731,659	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-8,515	-20,999	-30,260	-53,430	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	5,638	6,127	18,127	17,813	'	'	'	'
Provision for Loan, Lease, and Other Losses	2,523	9,965	11,482	26,860	'	'	'	'
Originated Loans | Commercial Portfolio Segmen	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,336	2,900	1,336	2,900	'	577	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	41,842	36,259	41,842	36,259	'	35,632	'	'
Financing Receivable, Allowance for Credit Losses	43,178	39,159	43,178	39,159	45,167	36,209	40,327	32,363
Financing Receivable, Individually Evaluated for Impairment	7,476	9,994	7,476	9,994	'	6,187	'	'
Financing Receivable, Collectively Evaluated for Impairment	3,856,619	3,039,235	3,856,619	3,039,235	'	3,300,339	'	'
Financing Receivable, Net	3,864,095	3,049,229	3,864,095	3,049,229	'	3,306,526	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,011	-8,773	-5,114	-19,906	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	1,162	1,408	5,745	3,120	'	'	'	'
Provision for Loan, Lease, and Other Losses	-2,140	6,197	6,338	23,582	'	'	'	'
Originated Loans | Commercial Real Estate Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	488	1,953	488	1,953	'	913	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	14,660	23,225	14,660	23,225	'	19,213	'	'
Financing Receivable, Allowance for Credit Losses	15,148	25,178	15,148	25,178	16,823	20,126	27,186	31,857
Financing Receivable, Individually Evaluated for Impairment	19,755	28,972	19,755	28,972	'	24,007	'	'
Financing Receivable, Collectively Evaluated for Impairment	2,207,657	2,124,370	2,207,657	2,124,370	'	2,200,409	'	'
Financing Receivable, Net	2,227,412	2,153,342	2,227,412	2,153,342	'	2,224,416	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-211	-727	-1,014	-3,496	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	168	180	503	825	'	'	'	'
Provision for Loan, Lease, and Other Losses	-1,632	-1,461	-4,467	-4,008	'	'	'	'
Originated Loans | Commercial Construction Financing Receivable Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	117	0	117	'	105	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,705	4,687	2,705	4,687	'	3,716	'	'
Financing Receivable, Allowance for Credit Losses	2,705	4,804	2,705	4,804	2,044	3,821	5,147	5,173
Financing Receivable, Individually Evaluated for Impairment	958	3,577	958	3,577	'	3,405	'	'
Financing Receivable, Collectively Evaluated for Impairment	327,904	305,528	327,904	305,528	'	332,142	'	'
Financing Receivable, Net	328,862	309,105	328,862	309,105	'	335,547	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	0	-127	-516	-165	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	394	61	483	364	'	'	'	'
Provision for Loan, Lease, and Other Losses	267	-277	-1,083	-568	'	'	'	'
Originated Loans | Finance Leases Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	'	0	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,019	506	1,019	506	'	639	'	'
Financing Receivable, Allowance for Credit Losses	1,019	506	1,019	506	909	639	358	341
Financing Receivable, Individually Evaluated for Impairment	0	0	0	0	'	0	'	'
Financing Receivable, Collectively Evaluated for Impairment	199,907	110,938	199,907	110,938	'	139,236	'	'
Financing Receivable, Net	199,907	110,938	199,907	110,938	'	139,236	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0	-1,237	0	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	11	0	100	38	'	'	'	'
Provision for Loan, Lease, and Other Losses	99	148	1,517	127	'	'	'	'
Originated Loans | Installment Financing Receivable Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	552	1,674	552	1,674	'	1,526	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	9,925	10,161	9,925	10,161	'	9,628	'	'
Financing Receivable, Allowance for Credit Losses	10,477	11,835	10,477	11,835	8,725	11,154	13,029	17,981
Financing Receivable, Individually Evaluated for Impairment	30,608	32,577	30,608	32,577	'	30,870	'	'
Financing Receivable, Collectively Evaluated for Impairment	1,616,487	1,288,505	1,616,487	1,288,505	'	1,297,388	'	'
Financing Receivable, Net	1,647,095	1,321,082	1,647,095	1,321,082	'	1,328,258	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-3,582	-5,507	-11,788	-14,441	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	2,624	2,883	7,859	9,104	'	'	'	'
Provision for Loan, Lease, and Other Losses	2,710	1,430	3,252	-809	'	'	'	'
Originated Loans | Home Equity Receivable Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	197	95	197	95	'	34	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	12,690	4,790	12,690	4,790	'	13,690	'	'
Financing Receivable, Allowance for Credit Losses	12,887	4,885	12,887	4,885	13,266	13,724	5,449	6,766
Financing Receivable, Individually Evaluated for Impairment	6,787	6,922	6,787	6,922	'	6,281	'	'
Financing Receivable, Collectively Evaluated for Impairment	882,585	782,820	882,585	782,820	'	799,797	'	'
Financing Receivable, Net	889,372	789,742	889,372	789,742	'	806,078	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,843	-2,784	-5,177	-7,373	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	802	1,007	1,884	2,588	'	'	'	'
Provision for Loan, Lease, and Other Losses	662	1,213	2,456	2,904	'	'	'	'
Originated Loans | Credit Card Receivables Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	261	106	261	106	'	127	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,245	7,129	7,245	7,129	'	7,257	'	'
Financing Receivable, Allowance for Credit Losses	7,506	7,235	7,506	7,235	7,288	7,384	6,690	7,369
Financing Receivable, Individually Evaluated for Impairment	1,253	1,767	1,253	1,767	'	1,612	'	'
Financing Receivable, Collectively Evaluated for Impairment	143,860	142,152	143,860	142,152	'	144,775	'	'
Financing Receivable, Net	145,113	143,919	145,113	143,919	'	146,387	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,367	-1,390	-4,229	-4,618	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	438	488	1,420	1,583	'	'	'	'
Provision for Loan, Lease, and Other Losses	1,147	1,447	2,931	2,901	'	'	'	'
Originated Loans | Residential Portfolio Segment	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,302	1,599	1,302	1,599	'	1,722	'	'
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,069	3,741	4,069	3,741	'	4,163	'	'
Financing Receivable, Allowance for Credit Losses	5,371	5,340	5,371	5,340	4,423	5,885	5,663	5,849
Financing Receivable, Individually Evaluated for Impairment	23,064	24,569	23,064	24,569	'	24,009	'	'
Financing Receivable, Collectively Evaluated for Impairment	464,219	414,494	464,219	414,494	'	421,202	'	'
Financing Receivable, Net	487,283	439,063	487,283	439,063	'	445,211	'	'
Financing Receivable, Allowance for Credit Losses, Write-downs	-501	-1,691	-1,185	-3,431	'	'	'	'
Financing Receivable, Allowance for Credit Losses, Recovery	39	100	133	191	'	'	'	'
Provision for Loan, Lease, and Other Losses	$1,410	$1,268	$538	$2,731	'	'	'	'

Allowance_for_Loan_Losses_Sche1

Allowance for Loan Losses Schedule of Credit Losses on Financing Receivables, Current Period (Details) (Covered Loans, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Loans	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of the period	$49,069	$42,606	$43,255	$36,417
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	2,855	7,698	19,009	28,177
Benefit Attributable to FDIC Loss Share Agreements	-1,032	-1,484	-8,890	-12,601
Provision for Loan Lease and Other Losses Covered	1,823	6,214	10,119	15,576
Increase in Indemnification Asset	-1,032	-1,484	-8,890	-12,601
Allowance for Loan and Lease Losses, Write-offs	-6,380	-6,660	-16,720	-20,950
Balance at end of the period	$45,544	$43,644	$45,544	$43,644

Allowance_for_Loan_Losses_Impa

Allowance for Loan Losses Impaired Financing Receivables (Details) (Originated Loans, USD $)	9 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	$4,136	[1]	$8,444	[1]	$5,004	[1]
Impaired Financing Receivable, Recorded Investment	88,002	[1]	108,378	[1]	96,371	[1]
Impaired Financing Receivable, Unpaid Principal Balance	104,973	[1]	134,017	[1]	122,187	[1]
Impaired Financing Receivable, Average Recorded Investment	100,763	[1]	124,814	[1]	116,779	[1]
C&I	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,826	[1]	1,443	[1]	3,098	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,887	[1]	10,154	[1]	14,473	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,842	[1]	9,903	[1]	12,533	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,650	[1]	8,551	[1]	3,089	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,526	[1]	12,555	[1]	4,943	[1]
Impaired Financing Receivable, Related Allowance	1,336	[1]	2,900	[1]	577	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,829	[1]	10,163	[1]	4,231	[1]
Commercial Real Estate	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	15,836	[1]	16,910	[1]	19,664	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	21,921	[1]	22,337	[1]	26,402	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18,884	[1]	19,217	[1]	23,911	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,920	[1]	11,543	[1]	4,343	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,251	[1]	14,113	[1]	4,927	[1]
Impaired Financing Receivable, Related Allowance	488	[1]	1,953	[1]	913	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,126	[1]	10,559	[1]	3,834	[1]
Construction	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	958	[1]	3,370	[1]	2,684	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,237	[1]	3,944	[1]	3,306	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,851	[1]	4,080	[1]	3,861	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[1]	726	[1]	721	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	[1]	726	[1]	721	[1]
Impaired Financing Receivable, Related Allowance	0	[1]	117	[1]	105	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	733	[1]	730	[1]
Installment	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,051	[1]	2,902	[1]	2,527	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,344	[1]	4,739	[1]	3,947	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,521	[1]	4,888	[1]	4,251	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	25,528	[1]	29,675	[1]	28,343	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	25,616	[1]	29,675	[1]	28,706	[1]
Impaired Financing Receivable, Related Allowance	552	[1]	1,674	[1]	1,526	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	26,172	[1]	30,361	[1]	29,583	[1]
Home equity lines	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,046	[1]	959	[1]	642	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,386	[1]	1,239	[1]	849	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,107	[1]	1,237	[1]	860	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,869	[1]	5,963	[1]	5,639	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,869	[1]	5,963	[1]	5,639	[1]
Impaired Financing Receivable, Related Allowance	197	[1]	95	[1]	34	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,017	[1]	6,206	[1]	5,924	[1]
Consumer Credit Card Financing Receivable	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	48	[1]	4	[1]	467	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	48	[1]	4	[1]	467	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	74	[1]	4	[1]	568	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,205	[1]	1,763	[1]	1,145	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,205	[1]	1,763	[1]	1,145	[1]
Impaired Financing Receivable, Related Allowance	261	[1]	106	[1]	127	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,352	[1]	1,975	[1]	1,311	[1]
Consumer Residential Mortgages Financing Receivable	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,363	[1]	10,693	[1]	9,578	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,899	[1]	12,838	[1]	12,142	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,122	[1]	11,542	[1]	10,645	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,702	[1]	13,876	[1]	14,431	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,784	[1]	13,967	[1]	14,520	[1]
Impaired Financing Receivable, Related Allowance	1,302	[1]	1,599	[1]	1,722	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11,866	[1]	13,946	[1]	14,537	[1]
Total impaired loans with no related allowance	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	35,128	[1]	36,281	[1]	38,660	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	49,722	[1]	55,255	[1]	61,586	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	47,401	[1]	50,871	[1]	56,629	[1]
Total impaired loans with a related allowance	'		'		'
Financing Receivable, Impaired [Line Items]	'		'		'
Impaired Financing Receivable, with Related Allowance, Recorded Investment	52,874	[1]	72,097	[1]	57,711	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	55,251	[1]	78,762	[1]	60,601	[1]
Impaired Financing Receivable, Related Allowance	4,136	[1]	8,444	[1]	5,004	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$53,362	[1]	$73,943	[1]	$60,150	[1]
[1]	Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.

Allowance_for_Loan_Losses_Trou

Allowance for Loan Losses Troubled Debt Restructuring on Financing Receivables (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

In Thousands, unless otherwise specified

C&I

C&I

C&I

Commercial Real Estate

Commercial Real Estate

Commercial Real Estate

Construction

Construction

Construction

Total commercial

Total commercial

Total commercial

Installment

Installment

Installment

Home Equity Line of Credit

Home Equity Line of Credit

Home Equity Line of Credit

Consumer Credit Card Financing Receivable

Consumer Credit Card Financing Receivable

Consumer Credit Card Financing Receivable

Residential mortgages

Residential mortgages

Residential mortgages

Total consumer

Total consumer

Total consumer

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Loans Commercial

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Consumer Loans

Originated Loans

Originated Loans

Originated Loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

Acquired Loans

Covered Loans

Covered Loans

Covered Loans

Covered Loans

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Loans Commercial

Covered Consumer Loans

Covered Consumer Loans

Covered Consumer Loans

Covered Consumer Loans

Covered TDR Loans

Covered TDR Loans

Covered TDR Loans

Covered TDR Loans

C&I

C&I

C&I

Commercial Real Estate

Commercial Real Estate

Commercial Real Estate

Construction

Construction

Construction

Total commercial

Total commercial

Total commercial

Installment

Installment

Installment

Home Equity Line of Credit

Home Equity Line of Credit

Home Equity Line of Credit

Consumer Credit Card Financing Receivable

Consumer Credit Card Financing Receivable

Consumer Credit Card Financing Receivable

Residential mortgages

Residential mortgages

Residential mortgages

Total consumer

Total consumer

Total consumer

C&I

Total commercial

Total commercial

Home Equity Line of Credit

Total consumer

C&I

C&I

C&I

Commercial Real Estate

Commercial Real Estate

Commercial Real Estate

Construction

Construction

Construction

Total commercial

Total commercial

Total commercial

Total consumer

Home Equity Line of Credit

Home Equity Line of Credit

Residential mortgages

Total consumer

Total commercial

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Financing Receivable, Modifications, Recorded Investment

$136,505

$150,487

$166,327

$6,998

[1]

$4,380

[1]

$7,691

[1]

$58,532

[1]

$66,577

[1]

$69,843

[1]

$4,998

[1]

$11,126

[1]

$18,216

[1]

$70,528

[1]

$82,083

[1]

$95,750

[1]

$28,578

[1]

$30,870

[1]

$32,577

[1]

$12,929

[1]

$11,913

[1]

$11,664

[1]

$1,253

[1]

$1,612

[1]

$1,767

$23,217

[1]

$24,009

[1]

$24,569

[1]

$65,977

[1]

$68,404

[1]

$70,577

[1]

$5,455

[1]

$2,617

[1]

$2,413

[1]

$15,508

[1]

$16,305

[1]

$17,763

[1]

$958

[1]

$2,955

[1]

$3,577

[1]

$21,921

[1]

$21,877

[1]

$23,753

[1]

$28,578

[1]

$30,870

[1]

$32,577

[1]

$6,916

[1]

$6,281

[1]

$6,922

[1]

$1,253

[1]

$1,612

[1]

$1,767

[1]

$23,065

[1]

$24,009

[1]

$24,569

[1]

$59,812

[1]

$62,772

[1]

$65,835

[1]

$81,733

[1]

$84,649

[1]

$89,588

[1]

$266

[1]

$6

$6

'

$260

[1]

$260

[1]

'

'

'

'

$1,537

[1]

$1,763

[1]

$5,278

[1]

$43,024

[1]

$50,272

[1]

$52,079

[1]

$4,040

[1]

$8,171

[1]

$14,640

[1]

$48,601

[1]

$60,206

[1]

$71,997

[1]

$5,905

[1]

$5,753

[1]

$5,632

[1]

$152

[1]

$4,742

$54,506

[1]

$65,838

[1]

$76,739

[1]

$71,997

Financing Receiables, Modifications, Unpaid Principal Balance

185,435

202,273

215,236

11,916

[1]

10,042

[1]

14,694

[1]

78,100

[1]

78,184

[1]

78,988

[1]

25,033

[1]

40,966

[1]

46,592

[1]

115,049

[1]

129,192

[1]

140,274

[1]

29,960

[1]

32,653

[1]

34,414

[1]

13,339

[1]

12,154

[1]

11,976

[1]

1,253

[1]

1,612

[1]

1,767

25,834

[1]

26,662

[1]

26,805

[1]

70,386

[1]

73,081

[1]

74,962

[1]

9,533

[1]

8,044

[1]

8,478

[1]

19,848

[1]

20,701

[1]

21,307

[1]

1,237

[1]

3,419

[1]

4,025

[1]

30,618

[1]

32,164

[1]

33,810

[1]

29,960

[1]

32,653

[1]

34,414

[1]

7,255

[1]

6,488

[1]

7,202

[1]

1,253

[1]

1,612

[1]

1,767

[1]

25,683

[1]

26,662

[1]

26,805

[1]

64,151

[1]

67,415

[1]

70,188

[1]

94,769

[1]

99,579

[1]

103,998

[1]

313

[1]

6

'

'

307

[1]

307

[1]

'

'

'

'

2,377

[1]

1,998

[1]

6,216

[1]

58,252

[1]

57,483

[1]

57,681

[1]

23,796

[1]

37,547

[1]

42,567

[1]

84,425

[1]

97,028

[1]

106,464

[1]

5,928

[1]

5,777

[1]

5,666

[1]

151

[1]

4,774

90,353

[1]

102,694

[1]

111,238

[1]

'

Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

$6

'

'

$2,855

$7,698

$19,009

$28,177

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

financing receivables, modifications, number of contracts at period end

2,732

2,842

2,964

40

27

33

73

60

61

41

38

37

154

125

131

1,655

1,769

1,840

291

261

259

339

389

426

293

298

308

2,578

2,717

2,833

35

24

22

49

40

36

31

28

27

115

92

85

1,655

1,769

1,840

240

226

229

339

389

426

292

298

308

2,526

2,682

2,803

2,641

2,774

2,888

4

1

'

'

3

3

'

'

'

'

4

3

11

24

20

25

10

10

10

38

33

46

49

48

35

1

30

87

68

76

'

[1]

Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.

Allowance_for_Loan_Losses_Accr1

Allowance for Loan Losses Accruing and Non-Accruing Troubled Debt Restructurings (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
In Thousands, unless otherwise specified
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	$136,505		$150,487		$166,327
Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	81,733	[1]	84,649	[1]	89,588	[1]
Financing Receivable, Recorded Investment, Current	9,712,992		8,652,722		8,231,707
Financing Receivable, Recorded Investment, Past Due	76,147		78,937		84,713
Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	266	[1]	'		'
Financing Receivable, Recorded Investment, Current	3,728,402		'		'
Financing Receivable, Recorded Investment, Past Due	97,349		'		'
Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		84,649		89,588
Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	54,506	[1]	65,838	[1]	76,739	[1]
Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	117,728		135,453		147,003
Financing Receivable, Recorded Investment, Current	70,718		77,630		92,430
Financing Receivable, Recorded Investment, Past Due	47,010		57,823		54,573
Accruing TDRs | Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	63,026		'		'
Financing Receivable, Recorded Investment, Current	57,915		'		'
Financing Receivable, Recorded Investment, Past Due	5,111		'		'
Accruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	196		'		'
Financing Receivable, Recorded Investment, Current	196		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Accruing TDRs | Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		69,615		70,264
Financing Receivable, Recorded Investment, Current	'		61,544		63,110
Financing Receivable, Recorded Investment, Past Due	'		8,071		7,154
Accruing TDRs | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	54,506		65,838		76,739
Financing Receivable, Recorded Investment, Current	12,607		16,086		29,320
Financing Receivable, Recorded Investment, Past Due	41,899		49,752		47,419
Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	18,777		15,034		19,324
Financing Receivable, Recorded Investment, Current	10,543		9,336		12,032
Financing Receivable, Recorded Investment, Past Due	8,234		5,698		7,292
Nonaccruing TDRs | Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	18,707		'		'
Financing Receivable, Recorded Investment, Current	10,543		'		'
Financing Receivable, Recorded Investment, Past Due	8,164		'		'
Nonaccruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	70		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	70		'		'
Nonaccruing TDRs | Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		15,034		19,324
Financing Receivable, Recorded Investment, Current	'		9,336		12,032
Financing Receivable, Recorded Investment, Past Due	'		5,698		7,292
Nonaccruing TDRs | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	7,621		11,297		15,365
Total Tdr Allowance | Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	3,342		'		'
Total Tdr Allowance | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		'		'
Total Tdr Allowance | Originated Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	'		4,600		4,118
Total Tdr Allowance | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	4,279		6,697		11,247
C&I	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6,998	[1]	4,380	[1]	7,691	[1]
C&I | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6		'		'
C&I | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	5,455	[1]	2,617	[1]	2,413	[1]
C&I | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,537		1,763		5,278
C&I | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,966		3,471		6,233
Financing Receivable, Recorded Investment, Current	4,044		1,139		1,955
Financing Receivable, Recorded Investment, Past Due	922		2,332		4,278
C&I | Accruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
C&I | Accruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	3,429		1,708		955
Financing Receivable, Recorded Investment, Current	3,249		704		955
Financing Receivable, Recorded Investment, Past Due	180		1,004		0
C&I | Accruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,537		1,763		5,278
Financing Receivable, Recorded Investment, Current	795		435		1,000
Financing Receivable, Recorded Investment, Past Due	742		1,328		4,278
C&I | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	2,032		909		1,458
Financing Receivable, Recorded Investment, Current	395		844		865
Financing Receivable, Recorded Investment, Past Due	1,637		65		593
C&I | Nonaccruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	6		'		'
C&I | Nonaccruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	2,026		909		1,458
Financing Receivable, Recorded Investment, Current	395		844		865
Financing Receivable, Recorded Investment, Past Due	1,631		65		593
C&I | Nonaccruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
C&I | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	1,182		735		1,653
C&I | Total Tdr Allowance | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		'		'
C&I | Total Tdr Allowance | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	736		217		126
C&I | Total Tdr Allowance | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	446		518		1,527
Commercial Real Estate	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	58,532	[1]	66,577	[1]	69,843	[1]
Commercial Real Estate | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	15,508	[1]	16,305	[1]	17,763	[1]
Commercial Real Estate | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	43,024		50,272		52,080
Commercial Real Estate | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	53,704		63,784		66,153
Financing Receivable, Recorded Investment, Current	15,812		20,377		28,907
Financing Receivable, Recorded Investment, Past Due	37,892		43,407		37,246
Commercial Real Estate | Accruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	10,680		13,512		14,073
Financing Receivable, Recorded Investment, Current	10,333		12,719		11,609
Financing Receivable, Recorded Investment, Past Due	347		793		2,464
Commercial Real Estate | Accruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	43,024		50,272		52,080
Financing Receivable, Recorded Investment, Current	5,479		7,658		17,298
Financing Receivable, Recorded Investment, Past Due	37,545		42,614		34,782
Commercial Real Estate | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,828		2,793		3,690
Financing Receivable, Recorded Investment, Current	1,976		461		473
Financing Receivable, Recorded Investment, Past Due	2,852		2,332		3,217
Commercial Real Estate | Nonaccruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,828		2,793		3,690
Financing Receivable, Recorded Investment, Current	1,976		461		473
Financing Receivable, Recorded Investment, Past Due	2,852		2,332		3,217
Commercial Real Estate | Nonaccruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Commercial Real Estate | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	3,126		5,828		8,489
Commercial Real Estate | Total Tdr Allowance | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	294		869		401
Commercial Real Estate | Total Tdr Allowance | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	2,832		4,959		8,088
Construction	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,998	[1]	11,126	[1]	18,216	[1]
Construction | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	958	[1]	2,955	[1]	3,577	[1]
Construction | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,040		8,171		14,639
Construction | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,935		10,991		18,146
Financing Receivable, Recorded Investment, Current	1,820		4,221		9,831
Financing Receivable, Recorded Investment, Past Due	3,115		6,770		8,315
Construction | Accruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	895		2,820		3,507
Financing Receivable, Recorded Investment, Current	895		1,860		3,507
Financing Receivable, Recorded Investment, Past Due	0		960		0
Construction | Accruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	4,040		8,171		14,639
Financing Receivable, Recorded Investment, Current	925		2,361		6,324
Financing Receivable, Recorded Investment, Past Due	3,115		5,810		8,315
Construction | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	63		135		70
Financing Receivable, Recorded Investment, Current	63		135		70
Financing Receivable, Recorded Investment, Past Due	0		0		0
Construction | Nonaccruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	63		135		70
Financing Receivable, Recorded Investment, Current	63		135		70
Financing Receivable, Recorded Investment, Past Due	0		0		0
Construction | Nonaccruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Construction | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	1,001		1,325		1,749
Construction | Total Tdr Allowance | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		105		117
Construction | Total Tdr Allowance | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	1,001		1,220		1,632
Total commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	70,528	[1]	82,083	[1]	95,750	[1]
Total commercial | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6		'		'
Total commercial | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	21,921	[1]	21,877	[1]	23,753	[1]
Total commercial | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	48,601		60,206		'
Total commercial | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		'		71,997
Total commercial | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	63,605		78,246		90,532
Financing Receivable, Recorded Investment, Current	21,676		25,737		40,693
Financing Receivable, Recorded Investment, Past Due	41,929		52,509		49,839
Total commercial | Accruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Total commercial | Accruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	15,004		18,040		18,535
Financing Receivable, Recorded Investment, Current	14,477		15,283		16,071
Financing Receivable, Recorded Investment, Past Due	527		2,757		2,464
Total commercial | Accruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	48,601		60,206		'
Financing Receivable, Recorded Investment, Current	7,199		10,454		'
Financing Receivable, Recorded Investment, Past Due	41,402		49,752		'
Total commercial | Accruing TDRs | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		'		71,997
Financing Receivable, Recorded Investment, Current	'		'		24,622
Financing Receivable, Recorded Investment, Past Due	'		'		47,375
Total commercial | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6,923		3,837		5,218
Financing Receivable, Recorded Investment, Current	2,434		1,440		1,408
Financing Receivable, Recorded Investment, Past Due	4,489		2,397		3,810
Total commercial | Nonaccruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	6		'		'
Total commercial | Nonaccruing TDRs | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6,917		3,837		5,218
Financing Receivable, Recorded Investment, Current	2,434		1,440		1,408
Financing Receivable, Recorded Investment, Past Due	4,483		2,397		3,810
Total commercial | Nonaccruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		0		'
Financing Receivable, Recorded Investment, Current	0		0		'
Financing Receivable, Recorded Investment, Past Due	0		0		'
Total commercial | Nonaccruing TDRs | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		'		0
Financing Receivable, Recorded Investment, Current	'		'		0
Financing Receivable, Recorded Investment, Past Due	'		'		0
Total commercial | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	5,309		7,888		11,891
Total commercial | Total Tdr Allowance | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		'		'
Total commercial | Total Tdr Allowance | Originated Loans Commercial	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	1,030		1,191		644
Total commercial | Total Tdr Allowance | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	4,279		6,697		'
Total commercial | Total Tdr Allowance | Covered TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	'		'		11,247
Consumer Installment	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	28,578		30,870		32,577
Consumer Installment | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	28,578		30,870		32,577
Consumer Installment | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	25,455		28,632		29,675
Financing Receivable, Recorded Investment, Current	24,194		27,085		28,604
Financing Receivable, Recorded Investment, Past Due	1,261		1,547		1,071
Consumer Installment | Accruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	25,455		28,632		29,675
Financing Receivable, Recorded Investment, Current	24,194		27,085		28,604
Financing Receivable, Recorded Investment, Past Due	1,261		1,547		1,071
Consumer Installment | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	3,123		2,238		2,902
Financing Receivable, Recorded Investment, Current	2,803		2,064		2,882
Financing Receivable, Recorded Investment, Past Due	320		174		20
Consumer Installment | Nonaccruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	3,123		2,238		2,902
Financing Receivable, Recorded Investment, Current	2,803		2,064		2,882
Financing Receivable, Recorded Investment, Past Due	320		174		20
Consumer Installment | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	552		1,526		1,674
Consumer Installment | Total Tdr Allowance | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	552		1,526		1,674
Home equity lines	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	12,929		11,913		11,664
Home equity lines | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	6,916		6,281		6,922
Home equity lines | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	260		'		'
Home equity lines | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	5,753		5,632		4,742
Home equity lines | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	11,605		11,051		10,307
Financing Receivable, Recorded Investment, Current	10,996		10,815		10,092
Financing Receivable, Recorded Investment, Past Due	609		236		215
Home equity lines | Accruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	5,656		5,419		5,565
Financing Receivable, Recorded Investment, Current	5,544		5,183		5,394
Financing Receivable, Recorded Investment, Past Due	112		236		171
Home equity lines | Accruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	196		'		'
Financing Receivable, Recorded Investment, Current	196		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Home equity lines | Accruing TDRs | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	5,753		5,632		4,742
Financing Receivable, Recorded Investment, Current	5,256		5,632		4,698
Financing Receivable, Recorded Investment, Past Due	497		0		44
Home equity lines | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,324		862		1,357
Financing Receivable, Recorded Investment, Current	1,260		636		1,131
Financing Receivable, Recorded Investment, Past Due	64		226		226
Home equity lines | Nonaccruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,260		862		1,357
Financing Receivable, Recorded Investment, Current	1,260		636		1,131
Financing Receivable, Recorded Investment, Past Due	0		226		226
Home equity lines | Nonaccruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	64		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	64		'		'
Home equity lines | Nonaccruing TDRs | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		0		0
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Home equity lines | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	197		34		95
Home equity lines | Total Tdr Allowance | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	197		34		95
Home equity lines | Total Tdr Allowance | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		'		'
Home equity lines | Total Tdr Allowance | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		0		0
Residential Mortgages	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	23,217	[1]	24,009	[1]	24,569	[1]
Residential Mortgages | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	23,065	[1]	24,009	[1]	24,569	[1]
Residential Mortgages | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	152	[1]	'		'
Residential Mortgages | Accruing TDRs | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	152		'		'
Financing Receivable, Recorded Investment, Current	152		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Residential Mortgages | Nonaccruing TDRs | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Residential Mortgages | Total Tdr Allowance | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		'		'
Consumer Credit Card Financing Receivable	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,253	[1]	1,612	[1]	1,767
Consumer Credit Card Financing Receivable | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,253	[1]	1,612	[1]	1,767	[1]
Consumer Credit Card Financing Receivable | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,251		1,601		1,764
Financing Receivable, Recorded Investment, Current	1,134		1,483		1,655
Financing Receivable, Recorded Investment, Past Due	117		118		109
Consumer Credit Card Financing Receivable | Accruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	1,251		1,601		1,764
Financing Receivable, Recorded Investment, Current	1,134		1,483		1,655
Financing Receivable, Recorded Investment, Past Due	117		118		109
Consumer Credit Card Financing Receivable | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	2		11		3
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	2		11		3
Consumer Credit Card Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	2		11		3
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	2		11		3
Consumer Credit Card Financing Receivable | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	261		127		106
Consumer Credit Card Financing Receivable | Total Tdr Allowance | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	261		127		106
Consumer Residential Mortgages Financing Receivable	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	23,217		24,009		24,569
Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	23,065		24,009		24,569
Consumer Residential Mortgages Financing Receivable | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	15,812		15,923		14,725
Financing Receivable, Recorded Investment, Current	12,718		12,510		11,386
Financing Receivable, Recorded Investment, Past Due	3,094		3,413		3,339
Consumer Residential Mortgages Financing Receivable | Accruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	15,660		15,923		14,725
Financing Receivable, Recorded Investment, Current	12,566		12,510		11,386
Financing Receivable, Recorded Investment, Past Due	3,094		3,413		3,339
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	7,405		8,086		9,844
Financing Receivable, Recorded Investment, Current	4,046		5,196		6,611
Financing Receivable, Recorded Investment, Past Due	3,359		2,890		3,233
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	7,405		8,086		9,844
Financing Receivable, Recorded Investment, Current	4,046		5,196		6,611
Financing Receivable, Recorded Investment, Past Due	3,359		2,890		3,233
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	1,302		1,722		1,599
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	1,302		1,722		1,599
Total consumer	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	65,977	[1]	68,404	[1]	70,577	[1]
Total consumer | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	59,812	[1]	62,772	[1]	65,835	[1]
Total consumer | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	260	[1]	'		'
Total consumer | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	5,905		'		'
Total consumer | Covered Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	'		'		4,742
Total consumer | Accruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	54,123		57,207		56,471
Financing Receivable, Recorded Investment, Current	49,042		51,893		51,737
Financing Receivable, Recorded Investment, Past Due	5,081		5,314		4,734
Total consumer | Accruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	48,022		51,575		51,729
Financing Receivable, Recorded Investment, Current	43,438		46,261		47,039
Financing Receivable, Recorded Investment, Past Due	4,584		5,314		4,690
Total consumer | Accruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	196		'		'
Financing Receivable, Recorded Investment, Current	196		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Total consumer | Accruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	5,905		'		'
Financing Receivable, Recorded Investment, Current	5,408		'		'
Financing Receivable, Recorded Investment, Past Due	497		'		'
Total consumer | Nonaccruing TDRs	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	11,854		11,197		14,106
Financing Receivable, Recorded Investment, Current	8,109		7,896		10,624
Financing Receivable, Recorded Investment, Past Due	3,745		3,301		3,482
Total consumer | Nonaccruing TDRs | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	11,790		11,197		14,106
Financing Receivable, Recorded Investment, Current	8,109		7,896		10,624
Financing Receivable, Recorded Investment, Past Due	3,681		3,301		3,482
Total consumer | Nonaccruing TDRs | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	64		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	64		'		'
Total consumer | Nonaccruing TDRs | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Financing Receivable, Modifications, Recorded Investment	0		'		'
Financing Receivable, Recorded Investment, Current	0		'		'
Financing Receivable, Recorded Investment, Past Due	0		'		'
Total consumer | Total Tdr Allowance	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	2,312		3,409		3,474
Total consumer | Total Tdr Allowance | Originated Consumer Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	2,312		3,409		3,474
Total consumer | Total Tdr Allowance | Acquired Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	0		'		'
Total consumer | Total Tdr Allowance | Covered Commercial TDR Loans	'		'		'
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]	'		'		'
Impaired Financing Receivable, Related Allowance	$0		'		'
[1]	Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.

Allowance_for_Loan_Losses_Sche2

Allowance for Loan Losses Schedule of Troubled Debt Restructuring Current Period (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	150
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$6,681
C&I	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,802
C&I | Originated Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,802
C&I | Covered Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Commercial Real Estate	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,668
Commercial Real Estate | Originated Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,668
Commercial Real Estate | Covered Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Construction	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Construction | Originated Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Construction | Covered Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Total commercial	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	4,470
Total commercial | Originated Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	4,470
Total commercial | Covered Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Consumer Installment	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	127
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,964
Consumer Installment | Originated Consumer Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	127
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,964
Home Equity Line of Credit	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	204
Home Equity Line of Credit | Originated Consumer Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	204
Consumer Credit Card Financing Receivable	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	43
Consumer Credit Card Financing Receivable | Originated Consumer Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	43
Residential mortgages	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Residential mortgages | Originated Consumer Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0
Total consumer	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	144
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,211
Total consumer | Originated Consumer Loans	'
Troubled Debt Restructuring, Debtor, Current Period [Line Items]	'
financing receivable, modifications, subsequent default, number of contracts at period end	144
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$2,211

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details Textual) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Apr. 12, 2013

Sep. 30, 2013

Sep. 30, 2013

Apr. 12, 2013

Sep. 30, 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]

'

'

'

'

'

'

'

'

'

'

'

'

Intangible assets

'

'

'

'

'

'

$84,774,000

[1]

'

'

$70,800,000

[1]

$14,000,000

[1]

$14,000,000

[1]

Goodwill

734,883,000

460,044,000

734,883,000

460,044,000

460,044,000

'

'

'

'

'

'

'

Finite-Lived Intangible Asset, Useful Life

'

'

'

'

'

'10 years

'

'

'15 years

'

'12 years

'

Amortization of Intangible Assets

2,972,000

456,000

5,700,000

1,422,000

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months

2,700,000

'

2,700,000

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Amortization Expense, Year Two

11,700,000

'

11,700,000

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Amortization Expense, Year Three

10,400,000

'

10,400,000

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Amortization Expense, Year Four

9,200,000

'

9,200,000

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Amortization Expense, Year Five

8,200,000

'

8,200,000

'

'

'

'

'

'

'

'

'

Goodwill

'

'

'

'

'

'

$274,838,000

$500,000

'

'

'

'

[1]

Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful life for which the core deposit intangible and the trust relationships are being amortized over is 15 years and 12 years, respectively.

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets Intangible Assets Schedule (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Apr. 12, 2013

Apr. 12, 2013

Sep. 30, 2013

Apr. 12, 2013

In Thousands, unless otherwise specified

Core Deposits

Core Deposits

Core Deposits

Noncompete Agreement

Noncompete Agreement

Noncompete Agreement

Lease Agreements

Lease Agreements

Lease Agreements

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Core Deposits

Customer Relationships

Customer Relationships

Acquired Finite-Lived Intangible Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Finite-Lived Intangible Assets, Net

$85,447

$6,373

$6,817

$73,208

$6,213

$6,642

$6

$26

$32

$107

$134

$143

'

'

$12,126

'

Intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

84,774

[1]

70,800

[1]

14,000

[1]

14,000

[1]

Finite-Lived Intangible Assets, Gross

102,253

17,479

17,479

87,533

16,759

16,759

102

102

102

618

618

618

'

'

'

'

Finite-Lived Intangible Assets, Accumulated Amortization

($16,806)

($11,106)

($10,662)

($14,325)

($10,546)

($10,117)

($96)

($76)

($70)

($511)

($484)

($475)

'

'

($1,874)

'

[1]

Intangible assets consist of core deposit intangibles of $70.8 million and trust relationships of approximately $14.0 million. The useful life for which the core deposit intangible and the trust relationships are being amortized over is 15 years and 12 years, respectively.

Shareholders_Equity_Earnings_P

Shareholders' Equity Earnings Per Share (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 12, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 12, 2013

Feb. 04, 2013

Apr. 12, 2013

Apr. 12, 2013

Sep. 30, 2013

Feb. 04, 2013

Dec. 31, 2012

Sep. 30, 2012

Stock Options

Stock Options

Stock Options

Stock Options

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

FirstMerit

Series A Non-Cumulative Perpetual Preferred Stock

Series A Non-Cumulative Perpetual Preferred Stock

Series A Non-Cumulative Perpetual Preferred Stock

Series A Non-Cumulative Perpetual Preferred Stock

Citizens Republic Bancorp

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value

$2,400,000

$1,800,000

$2,400,000

$1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

1.37

'

'

'

'

'

'

'

FirstMerit shares of Common Stock issued for Citizens' shares

'

'

'

'

'

'

'

'

'

55,468,283

'

'

'

'

'

'

'

Average common and Common Stock equivalent shares outstanding

168,916,000

109,645,000

147,341,000

109,473,000

'

3,872,000

0

2,939,000

0

'

'

'

'

'

'

'

'

Net income

40,715,000

34,953,000

126,510,000

95,882,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends, Preferred Stock

1,469,000

0

3,868,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Undistributed Earnings Allocated to Participating Securities

309,000

156,000

1,098,000

87,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income available to common shareholders

38,937,000

34,797,000

121,544,000

95,795,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Average Common Shares Outstanding Prior to Participating Share Adjustment

166,323,000

110,682,000

145,681,000

110,282,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights

1,279,000

1,037,000

1,279,000

809,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average number of common shares outstanding - basic

165,044,000

109,645,000

144,402,000

109,473,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnings Per Share, Basic

$0.24

$0.32

$0.84

$0.88

'

'

'

'

'

'

'

'

'

'

'

'

'

Undistributed earnings allocated to unvested securities-Diluted EPS

105,000

176,000

485,000

342,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Undistributed earnings allocated to participating securities-Diluted

105,000

176,000

485,000

342,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Income used in diluted earnings per share calculation

38,937,000

34,797,000

121,544,000

95,795,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average number of shares outstanding prior to participating share adjustment

166,323,000

110,682,000

145,681,000

110,282,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Earnings Per Share, Diluted

$0.23

$0.32

$0.82

$0.88

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

1,757,812.50

2,408,203

'

'

'

'

Exercise Price of Warrants or Rights

'

'

'

'

$18.69

'

'

'

'

'

'

'

'

'

'

'

'

5.875% Non-Cumulative Perpetual Preferred stock, Series A, authorized 115,000 shares

7,000,000

'

7,000,000

'

'

'

'

'

'

'

'

'

'

115,000

'

0

0

5.875% Non-Cumulative Perpetual Preferred stock, Series A, 100,000 outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000

100,000

0

0

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

'

'

'

'

'

'

'

'

'

'

5.88%

'

'

'

'

'

'

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
OPERATIONS:	'	'	'	'
Net interest income	$203,340	$117,890	$512,717	$355,600
Provision for Loan, Lease, and Other Losses	6,379	16,179	23,634	42,436
Noninterest Income	71,090	54,925	197,923	161,952
Other expenses	211,378	108,587	507,943	341,432
Net income	40,715	34,953	126,510	95,882
AVERAGES :	'	'	'	'
Assets	24,013,594	14,734,016	20,632,658	14,596,526
Total commercial	'	'	'	'
OPERATIONS:	'	'	'	'
Net interest income	106,443	65,446	277,468	193,776
Provision for Loan, Lease, and Other Losses	-27	10,401	6,866	22,970
Noninterest Income	21,364	15,247	60,980	47,603
Other expenses	57,033	39,595	151,587	123,074
Net income	46,021	19,954	116,997	61,967
AVERAGES :	'	'	'	'
Assets	8,685,333	6,466,355	8,020,824	6,386,617
Retail	'	'	'	'
OPERATIONS:	'	'	'	'
Net interest income	99,548	51,181	239,922	158,745
Provision for Loan, Lease, and Other Losses	905	1,194	7,071	5,459
Noninterest Income	30,723	26,783	88,916	76,226
Other expenses	96,153	53,788	235,518	169,618
Net income	21,589	14,939	56,061	38,931
AVERAGES :	'	'	'	'
Assets	5,659,553	2,960,336	4,646,817	2,929,911
Wealth	'	'	'	'
OPERATIONS:	'	'	'	'
Net interest income	3,613	4,223	11,162	13,412
Provision for Loan, Lease, and Other Losses	-736	-519	-570	-318
Noninterest Income	13,216	8,528	34,347	24,987
Other expenses	14,650	9,711	38,698	29,718
Net income	1,894	2,313	4,796	5,849
AVERAGES :	'	'	'	'
Assets	266,028	242,539	255,538	238,899
Nonreportable segments and reconciling items	'	'	'	'
OPERATIONS:	'	'	'	'
Net interest income	-6,264	-2,960	-15,835	-10,333
Provision for Loan, Lease, and Other Losses	6,237	5,103	10,267	14,325
Noninterest Income	5,787	4,367	13,680	13,136
Other expenses	43,542	5,493	82,140	19,022
Net income	-28,789	-2,253	-51,344	-10,865
AVERAGES :	'	'	'	'
Assets	$9,402,680	$5,064,786	$7,709,479	$5,041,099

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
In Thousands, unless otherwise specified
Derivatives designated in hedge relationships	'		'		'
Derivative Asset, Fair Value	$53,839		$63,231		$70,270
Derivative Liability, Fair Value	65,506		77,968		87,161
Interest rate swaps | Designated as Hedging Instrument	'		'		'
Derivatives designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	133,159		161,133		182,950
Derivative Liability, Fair Value	$13,289	[2]	$19,080	[2]	$22,071	[2]
[1]	(a) Included in Other Assets on the Consolidated Balance Sheet
[2]	(b) Included in Other Liabilities on the Consolidated Balance Sheet

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Details 1) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
In Thousands, unless otherwise specified
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Fair Value	$53,839		$63,231		$70,270
Derivative Liability, Fair Value	65,506		77,968		87,161
Not Designated as Hedging Instrument	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	1,696,516		1,379,768		1,392,185
Derivative Asset, Fair Value	53,839	[1]	63,231	[1]	70,270	[1]
Derivative Liability, Notional/Contract Amount	1,726,203		1,391,595		1,364,744
Derivative Liability, Fair Value	52,217	[2]	58,888	[2]	65,090	[2]
Not Designated as Hedging Instrument | Interest rate swaps	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	1,546,228		1,204,835		1,166,765
Derivative Asset, Fair Value	51,044	[1]	58,769	[1]	62,796	[1]
Derivative Liability, Notional/Contract Amount	1,546,228		1,204,835		1,166,765
Derivative Liability, Fair Value	51,044	[2]	58,769	[2]	62,796	[2]
Not Designated as Hedging Instrument | Mortgage loan commitments	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	144,572		168,271		221,057
Derivative Asset, Fair Value	2,729	[1]	4,400	[1]	7,394	[1]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	0	[2]	0	[2]	0	[2]
Not Designated as Hedging Instrument | Forward sales contracts	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	68,581		124,017		144,849
Derivative Liability, Fair Value	1,081	[2]	62	[2]	2,223	[2]
Not Designated as Hedging Instrument | Credit Risk Contract	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	50,336		25,225		20,861
Derivative Liability, Fair Value	0	[2]	0	[2]	0	[2]
Not Designated as Hedging Instrument | Foreign Exchange	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	5,716		6,662		4,363
Derivative Asset, Fair Value	66	[1]	62	[1]	80	[1]
Derivative Liability, Notional/Contract Amount	6,295		6,026		4,371
Derivative Liability, Fair Value	92	[2]	57	[2]	71	[2]
Not Designated as Hedging Instrument | Other Contract	'		'		'
Derivatives not designated in hedge relationships	'		'		'
Derivative Asset, Notional/Contract Amount	0		0		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	54,763		31,492		27,898
Derivative Liability, Fair Value	$0	[2]	$0	[2]	$0	[2]
[1]	(a) Included in Other Assets on the Consolidated Balance Sheet
[2]	(b) Included in Other Liabilities on the Consolidated Balance Sheet

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Details 2) (Not Designated as Hedging Instrument, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains and losses recognized in income on derivatives	($3,393)	$1,259	($2,809)	$2,206
Mortgage loan commitments | Other income	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains and losses recognized in income on derivatives	1,950	2,146	-1,672	2,435
Forward sales contracts | Other income	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains and losses recognized in income on derivatives	-5,538	-1,023	-1,019	-425
Credit Risk Contract | Other income	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains and losses recognized in income on derivatives	195	136	-118	196
Other | Other Expenses	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Gains and losses recognized in income on derivatives	$0	$0	$0	$0

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Details Textual) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
		Government Agency Issued Bonds or MBS	Government Agency Issued Bonds or MBS	Government Agency Issued Bonds or MBS
Derivative [Line Items]	'	'	'	'
Term of written loan commitments, days	'60	'	'	'
Default Assumptions Percentage	100.00%	'	'	'
Maximum value of the guaranteed derivative instruments	$3.30	'	'	'
Collateral posted against derivative liabilities	'	$78.20	$96.50	$103
Remaining Term on Swap Participation Agreements, Min	'1 year	'	'	'
Remaining Term on Swap Participation Agreements, Max	'6 years	'	'	'

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities Derivatives and Hedging Activities (Details 3) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'	'
offsetting disclosure, derivative asset, fair value, gross	$2,651	$69	$85
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	2,651	69	85
offseting disclosure, netting adjustment, derivative liability, fair value	-2,677	-69	-85
offsetting disclosure, collateral value, derivative asset	26	0	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
offsetting disclosure, derivative liability, fair value, gross	61,839	77,839	84,860
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	61,839	77,839	84,860
offseting disclosure, netting adjustment, derivative asset, fair value	-2,677	-69	-85
offsetting disclosure, collateral value, derivative liability	-59,162	-77,770	-84,775
offsetting disclosure, net amount total, derivative liability, fair value	0	0	0
Designated as Hedging Instrument | Interest Rate Swap	'	'	'
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'	'
offsetting disclosure, derivative liability, fair value, gross	13,289	19,080	22,071
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	13,289	19,080	22,071
offseting disclosure, netting adjustment, derivative asset, fair value	0	0	0
offsetting disclosure, collateral value, derivative liability	-13,289	-19,080	-22,071
offsetting disclosure, net amount total, derivative liability, fair value	0	0	0
Not Designated as Hedging Instrument | Interest Rate Swap	'	'	'
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'	'
offsetting disclosure, derivative asset, fair value, gross	2,585	55	63
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	2,585	55	63
offseting disclosure, netting adjustment, derivative liability, fair value	-2,585	-55	-63
offsetting disclosure, collateral value, derivative asset	0	0	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
offsetting disclosure, derivative liability, fair value, gross	48,458	58,714	62,733
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	48,458	58,714	62,733
offseting disclosure, netting adjustment, derivative asset, fair value	-2,585	-55	-63
offsetting disclosure, collateral value, derivative liability	-45,873	-58,659	-62,670
offsetting disclosure, net amount total, derivative liability, fair value	0	0	0
Not Designated as Hedging Instrument | Foreign Exchange Contract	'	'	'
Offsetting Disclosure for Derivative Contracts [Line Items]	'	'	'
offsetting disclosure, derivative asset, fair value, gross	66	14	22
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	66	14	22
offseting disclosure, netting adjustment, derivative liability, fair value	-92	-14	-22
offsetting disclosure, collateral value, derivative asset	26	0	0
offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
offsetting disclosure, derivative liability, fair value, gross	92	45	56
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	92	45	56
offseting disclosure, netting adjustment, derivative asset, fair value	-92	-14	-22
offsetting disclosure, collateral value, derivative liability	0	-31	-34
offsetting disclosure, net amount total, derivative liability, fair value	$0	$0	$0

Benefit_Plans_Schedule_of_Net_

Benefit Plans Schedule of Net Benefit Costs Details (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
FirstMerit | Pension and post- retirement costs	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Defined Benefit Plan, Service Cost	$585	$1,799	$1,755	$5,397
Defined Benefit Plan, Interest Cost	2,632	2,965	7,896	8,895
Defined Benefit Plan, Expected Return on Plan Assets	-2,960	-3,034	-8,880	-9,102
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	117	97	351	291
Defined Benefit Plan, Amortization of Gains (Losses)	1,174	2,593	3,522	7,779
Defined Benefit Plan, Net Periodic Benefit Cost	1,548	4,420	4,644	13,260
FirstMerit | Other Postretirement Benefit Plans, Defined Benefit	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Defined Benefit Plan, Service Cost	24	19	74	57
Defined Benefit Plan, Interest Cost	130	174	390	522
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	-117	-117	-351	-351
Defined Benefit Plan, Amortization of Gains (Losses)	67	72	201	216
Defined Benefit Plan, Net Periodic Benefit Cost	104	148	314	444
Citizens Republic Bancorp | Pension and post- retirement costs	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Defined Benefit Plan, Interest Cost	795	'	1,590	'
Defined Benefit Plan, Expected Return on Plan Assets	-1,096	'	-2,192	'
Defined Benefit Plan, Net Periodic Benefit Cost	-301	'	-602	'
Citizens Republic Bancorp | Other Postretirement Benefit Plans, Defined Benefit	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Defined Benefit Plan, Interest Cost	15,770	'	31,540	'
Defined Benefit Plan, Net Periodic Benefit Cost	$15,770	'	$31,540	'

Benefit_Plans_Narratives_Detai

Benefit Plans (Narratives) (Details)	3 Months Ended
	Sep. 30, 2013
FirstMerit | Up to 3% contribution	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	3.00%
FirstMerit | 3% to 5% contribution	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	2.00%
Citizens Republic Bancorp | Up to 2% contribution	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	2.00%
Citizens Republic Bancorp | 3% to6% contribution	'
Defined Benefit Plan Disclosure [Line Items]	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	25.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	6.00%

Fair_Value_Measurement_Recurri

Fair Value Measurement (Recurring and Nonrecurring Table) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
In Thousands, unless otherwise specified
Recurring Fair Value Measurements	'		'		'
Available-for-sale	$3,256,259		$2,920,971		$2,911,993
Residential loans held for sale	17,813		23,683		17,540
Derivative Asset, Fair Value, Gross Asset	53,839		63,231		70,270
Total Assets, Fair Value Disclosure, Recurring	3,327,911		3,007,885		2,999,803
Derivative Liability, Fair Value, Gross Liability	65,506		77,968		87,161
True Up Liability	11,457		12,259		12,642
Total liabilities at fair value on a recurring basis	76,963	[1]	90,227	[1]	99,803
Nonrecurring Fair Value Measurements [Abstract]	'		'		'
Fair Value of Mortgage Servicing Rights	22,616	[2]	18,833	[2]	17,294
Impaired and Non Accrual Loans Fair Value Disclosure	48,129	[3]	54,491	[3]	44,010
Other Real Estate, Non Covered	13,413	[4]	7,540	[4]	6,333
Other Real Estate Covered by Loss Share	8,475	[5]	12,631	[5]	14,695
Nonrecurring Fair Value	92,633		93,495		82,332
Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	3,096		3,241		3,245
Residential loans held for sale	0		0		0
Derivative Asset, Fair Value, Gross Asset	0		0		0
Total Assets, Fair Value Disclosure, Recurring	3,096		3,241		3,245
Derivative Liability, Fair Value, Gross Liability	0		0		0
True Up Liability	0		0		0
Total liabilities at fair value on a recurring basis	0	[1]	0	[1]	0
Nonrecurring Fair Value Measurements [Abstract]	'		'		'
Fair Value of Mortgage Servicing Rights	0	[2]	0	[2]	0
Impaired and Non Accrual Loans Fair Value Disclosure	0	[3]	0	[3]	0
Other Real Estate, Non Covered	0	[4]	0	[4]	0
Other Real Estate Covered by Loss Share	0	[5]	0	[5]	0
Nonrecurring Fair Value	0		0		0
Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	2,930,401		2,868,069		2,861,244
Residential loans held for sale	17,813		23,683		17,540
Derivative Asset, Fair Value, Gross Asset	53,839		63,231		70,270
Total Assets, Fair Value Disclosure, Recurring	3,002,053		2,954,983		2,949,054
Derivative Liability, Fair Value, Gross Liability	65,506		77,968		87,161
True Up Liability	0		0		0
Total liabilities at fair value on a recurring basis	65,506	[1]	77,968	[1]	87,161
Nonrecurring Fair Value Measurements [Abstract]	'		'		'
Fair Value of Mortgage Servicing Rights	0	[2]	0	[2]	0
Impaired and Non Accrual Loans Fair Value Disclosure	0	[3]	0	[3]	0
Other Real Estate, Non Covered	0	[4]	0	[4]	0
Other Real Estate Covered by Loss Share	0	[5]	0	[5]	0
Nonrecurring Fair Value	0		0		0
Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	322,762		49,661		47,504
Residential loans held for sale	0		0		0
Derivative Asset, Fair Value, Gross Asset	0		0		0
Total Assets, Fair Value Disclosure, Recurring	322,762		49,661		47,504
Derivative Liability, Fair Value, Gross Liability	0		0		0
True Up Liability	11,457		12,259		12,642
Total liabilities at fair value on a recurring basis	11,457	[1]	12,259	[1]	12,642
Nonrecurring Fair Value Measurements [Abstract]	'		'		'
Fair Value of Mortgage Servicing Rights	22,616	[2]	18,833		17,294
Impaired and Non Accrual Loans Fair Value Disclosure	48,129		54,491		44,010
Other Real Estate, Non Covered	13,413	[4]	7,540	[4]	6,333
Other Real Estate Covered by Loss Share	8,475	[5]	12,631	[5]	14,695
Nonrecurring Fair Value	92,633		93,495		82,332
Equity Securities	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	6,377		3,241		3,245
Equity Securities | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		3,241		3,245
Equity Securities | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		0		0
Equity Securities | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		0		0
Marketable equity securities	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	3,096		'		'
Marketable equity securities | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	3,096		'		'
Marketable equity securities | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		'		'
Marketable equity securities | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		'		'
Other Security Investments	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	3,281		'		'
Other Security Investments | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		'		'
Other Security Investments | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	10		'		'
Other Security Investments | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	3,271		'		'
US Government Agency Debentures	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		'		35,137
US Government Agency Debentures | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		'		0
US Government Agency Debentures | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		'		35,137
US Government Agency Debentures | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	'		'		0
U.S. States and political subdivisions debt securities	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	272,224		268,204		258,418
U.S. States and political subdivisions debt securities | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
U.S. States and political subdivisions debt securities | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	272,224		268,204		258,418
U.S. States and political subdivisions debt securities | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	999,375		1,107,063		1,277,831
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	999,375		1,107,063		1,277,831
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	55,932		52,036		15,667
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	55,932		52,036		15,667
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	1,505,706		1,329,421		1,205,525
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	1,505,706		1,329,421		1,205,525
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	9		11		12
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		2		1
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	9		9		11
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	97,154		111,343		68,665
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	97,154		111,343		68,665
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Corporate debt securities	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	50,850		49,652		47,493
Corporate debt securities | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Corporate debt securities | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	0		0		0
Corporate debt securities | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	50,850		49,652		47,493
Collateralized Loan Obligations	'		'		'
Recurring Fair Value Measurements	'		'		'
Available-for-sale	268,632		'		'
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	268,632		'		'
Not Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	53,839	[6]	63,231	[6]	70,270	[6]
Derivative Liability, Fair Value, Gross Liability	52,217	[7]	58,888	[7]	65,090	[7]
Interest Rate Swap | Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0	[6]	0	[6]	0	[6]
Derivative Liability, Fair Value, Gross Liability	13,289	[7]	19,080	[7]	22,071	[7]
Interest Rate Swap | Designated as Hedging Instrument | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Liability, Fair Value, Gross Liability	0		0		0
Interest Rate Swap | Designated as Hedging Instrument | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Liability, Fair Value, Gross Liability	13,289		19,080		22,071
Interest Rate Swap | Designated as Hedging Instrument | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Liability, Fair Value, Gross Liability	0		0		0
Interest Rate Swap | Not Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	51,044	[6]	58,769	[6]	62,796	[6]
Derivative Liability, Fair Value, Gross Liability	51,044	[7]	58,769	[7]	62,796	[7]
Interest Rate Swap | Not Designated as Hedging Instrument | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	0		0		0
Interest Rate Swap | Not Designated as Hedging Instrument | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	51,044		58,769		62,796
Derivative Liability, Fair Value, Gross Liability	51,044		58,769		62,796
Interest Rate Swap | Not Designated as Hedging Instrument | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	0		0		0
Mortgage Loan Commitments | Not Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	2,729	[6]	4,400	[6]	7,394	[6]
Derivative Liability, Fair Value, Gross Liability	0	[7]	0	[7]	0	[7]
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0		0		0
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	2,729		4,400		7,394
Mortgage Loan Commitments | Not Designated as Hedging Instrument | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0		0		0
Forward sales contracts | Not Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0	[6]	0	[6]	0	[6]
Derivative Liability, Fair Value, Gross Liability	1,081	[7]	62	[7]	2,223	[7]
Forward sales contracts | Not Designated as Hedging Instrument | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Liability, Fair Value, Gross Liability	0		0		0
Forward sales contracts | Not Designated as Hedging Instrument | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Liability, Fair Value, Gross Liability	1,081		62		2,223
Forward sales contracts | Not Designated as Hedging Instrument | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Liability, Fair Value, Gross Liability	0		0		0
Foreign Exchange | Not Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	66	[6]	62	[6]	80	[6]
Derivative Liability, Fair Value, Gross Liability	92	[7]	57	[7]	71	[7]
Foreign Exchange | Not Designated as Hedging Instrument | Level 1	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	0		0		0
Foreign Exchange | Not Designated as Hedging Instrument | Level 2	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	66		62		80
Derivative Liability, Fair Value, Gross Liability	92		57		71
Foreign Exchange | Not Designated as Hedging Instrument | Level 3	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	0		0		0
Other Contract | Not Designated as Hedging Instrument	'		'		'
Recurring Fair Value Measurements	'		'		'
Derivative Asset, Fair Value, Gross Asset	0	[6]	0	[6]	0	[6]
Derivative Liability, Fair Value, Gross Liability	$0	[7]	$0	[7]	$0	[7]
[1]	(a) - There were no transfers between levels 1 and 2 of the fair value hierarchy during the three months ended SeptemberB 30, 2013.
[2]	(b) - MSRs with a recorded investment of $22.9 million were reduced by a specific valuation allowance totaling $0.6 million to a reported carrying value of $22.4 million resulting in recognition of $0.1 million in recoveries included in loans sales and servicing income in the three months ended SeptemberB 30, 2013.
[3]	(c) - Collateral dependent impaired loans with a recorded investment of $51.3 million were reduced by specific valuation allowance allocations totaling $3.1 million to a reported net carrying value of $48.1 million.
[4]	(d) - Amounts do not include assets held at cost at SeptemberB 30, 2013. During the three months ended SeptemberB 30, 2013, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.3 million included in noninterest expense.
[5]	(e) - Amounts do not include assets held at cost at SeptemberB 30, 2013. During the three months ended SeptemberB 30, 2013, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses $0.2 million included in noninterest expense.
[6]	(a) Included in Other Assets on the Consolidated Balance Sheet
[7]	(b) Included in Other Liabilities on the Consolidated Balance Sheet

Fair_Value_Measurement_Changes

Fair Value Measurement (Changes in Level 3 Table) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Available-for-sale securities, Beginning balance	$212,512		$48,096		$49,661		$87,539
True-up liability, Beginning balance	10,937		11,820		12,259		11,551
Fair value of assets acquired	0	[1]	'	[1]	3,271	[1]	0	[1]
Available-for-sale securities, Total unrealized gains/losses	0	[1]	0	[1]	0	[1]	0	[1]
True-up liability, Total unrealized gains/losses	520	[1]	822	[1]	0	[1]	1,091	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	-1,704	[2]	-605	[2]	-2,066	[2]	3,137	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	'	[2]	0	[2]	-802	[2]	0	[2]
Available-for-sale securities, Purchases	111,940		0		271,856		0
True-up liability, Purchases	0		0		0		0
Available-for-sale securities, Sales	0		0		0		-40,520
True-up liability, Sales	0		0		0		0
Available-for-sale securities, Settlements	13		13		39		-2,652
True-up liability, Settlements	0		0		0		0
Available-for-sale securities, Transfers	0		0		0		0
True-up liability, Transfers	0		0		0		0
Available-for-sale securities, Ending balance	322,761		47,504		322,761		47,504
True-up liability, Ending balance	$11,457		$12,642		$11,457		$12,642
[1]	(a) Reported in other expense
[2]	(b) Reported in other comprehensive income (loss)

Fair_Value_Measurement_Loans_H

Fair Value Measurement (Loans Held for Sale Table) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
In Thousands, unless otherwise specified
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]	'		'		'
Loans Held-for-sale, Fair Value Disclosure	$17,813		$23,683		$17,540
Aggregate Fair Value	'		'		'
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]	'		'		'
Loans Held-for-sale, Fair Value Disclosure	17,813		23,683		17,540
Contractual Balance	'		'		'
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]	'		'		'
Loans Held-for-sale, Fair Value Disclosure	17,179		22,765		16,635
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$634	[1]	$918	[1]	$905
[1]	(a) These changes are included in loan sales and servicing income in the Consolidated Statements of Comprehensive Income.

Fair_Value_Measurement_Fair_Va

Fair Value Measurement (Fair Value Disclosure Table) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financial assets:	'	'	'	'
Cash and Cash Equivalents, at Carrying Value	$1,247,267	$258,014	$238,417	$377,319
Cash and due from banks, Fair Value	1,247,267	258,014	238,417	'
Available-for-sale Securities, Carrying Amount	3,256,259	2,920,971	2,911,993	'
Held-to-maturity Securities, Carrying Amount	2,749,934	622,121	620,631	'
Held-to-maturity Securities, Fair Value Disclosure	2,658,433	630,799	631,237	'
Other Investments, Carrying Amount	270,369	140,717	140,730	'
Other Investments, Fair Value	270,369	140,717	140,730	'
Loans Receivable Held-for-sale, Carrying Amount	17,813	23,683	17,540	'
Loans Held-for-sale, Fair Value Disclosure	17,813	23,683	17,540	'
Loans and Leases Receivable, Carrying Amount	9,690,848	8,632,717	8,217,478	'
Net noncovered loans, Fair Value	9,623,848	8,604,872	7,898,195	'
Net covered loans and loss share receivable, Carrying Amount	608,732	975,870	1,131,285	'
Net covered loans and loss share receivable, Fair Value	608,732	975,870	1,131,285	'
Accrued interest receivable, Carrying Amount	49,820	40,389	43,901	'
Accrued interest receivable, Fair Value	49,820	40,389	43,901	'
Derivative Assets, Carrying Amount	53,839	63,231	70,270	'
Derivative Asset, Fair Value, Gross Asset	53,839	63,231	70,270	'
Financial liabilities:	'	'	'	'
Deposits, Carrying Amount	19,489,533	11,759,425	11,532,426	'
Deposits, Fair Value	19,508,531	11,765,873	11,540,681	'
Total Federal funds purchased and securities sold under agreements to repurchase, Carrying Amount	1,049,801	1,104,525	963,455	'
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	1,049,801	1,104,525	963,455	'
Wholesale Borrowings, Carrying Amount	200,858	136,883	178,083	'
Other Borrowings, Fair Value	204,461	143,029	187,230	'
Long-term Debt	324,425	0	0	'
Long-term Debt, Fair Value	321,255	'	'	'
Accrued interest payable, Carrying Amount	5,884	2,515	2,798	'
Accrued interest payable, Fair Value	5,884	2,515	2,798	'
Derivative liabilities, Carrying Amount	65,506	77,968	87,161	'
Derivative Liability, Fair Value, Gross Liability	65,506	77,968	87,161	'
Fair Value, Inputs, Level 1	'	'	'	'
Financial assets:	'	'	'	'
Cash and due from banks, Fair Value	1,247,267	258,014	238,417	'
Available-for-sale Securities, Carrying Amount	3,096	3,241	3,245	'
Held-to-maturity Securities, Fair Value Disclosure	0	0	0	'
Other Investments, Fair Value	0	0	0	'
Loans Held-for-sale, Fair Value Disclosure	0	0	0	'
Net noncovered loans, Fair Value	0	0	0	'
Net covered loans and loss share receivable, Fair Value	0	0	0	'
Accrued interest receivable, Fair Value	0	0	0	'
Derivative Asset, Fair Value, Gross Asset	0	0	0	'
Financial liabilities:	'	'	'	'
Deposits, Fair Value	0	0	0	'
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	0	0	0	'
Other Borrowings, Fair Value	0	0	0	'
Long-term Debt, Fair Value	0	'	'	'
Accrued interest payable, Fair Value	0	0	0	'
Derivative Liability, Fair Value, Gross Liability	0	0	0	'
Fair Value, Inputs, Level 2	'	'	'	'
Financial assets:	'	'	'	'
Cash and due from banks, Fair Value	0	0	0	'
Available-for-sale Securities, Carrying Amount	2,930,401	2,868,069	2,861,244	'
Held-to-maturity Securities, Fair Value Disclosure	2,658,433	630,799	631,237	'
Other Investments, Fair Value	270,369	140,717	140,730	'
Loans Held-for-sale, Fair Value Disclosure	17,813	23,683	17,540	'
Net noncovered loans, Fair Value	0	0	0	'
Net covered loans and loss share receivable, Fair Value	0	0	0	'
Accrued interest receivable, Fair Value	49,820	40,389	43,901	'
Derivative Asset, Fair Value, Gross Asset	53,839	63,231	70,270	'
Financial liabilities:	'	'	'	'
Deposits, Fair Value	19,508,531	11,765,873	11,540,681	'
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	1,049,801	1,104,525	963,455	'
Other Borrowings, Fair Value	204,461	143,029	187,230	'
Long-term Debt, Fair Value	321,255	'	'	'
Accrued interest payable, Fair Value	5,884	2,515	2,798	'
Derivative Liability, Fair Value, Gross Liability	65,506	77,968	87,161	'
Fair Value, Inputs, Level 3	'	'	'	'
Financial assets:	'	'	'	'
Cash and due from banks, Fair Value	0	0	0	'
Available-for-sale Securities, Carrying Amount	322,762	49,661	47,504	'
Held-to-maturity Securities, Fair Value Disclosure	0	0	0	'
Other Investments, Fair Value	0	0	0	'
Loans Held-for-sale, Fair Value Disclosure	0	0	0	'
Net noncovered loans, Fair Value	9,623,848	8,604,872	7,898,195	'
Net covered loans and loss share receivable, Fair Value	608,732	975,870	1,131,285	'
Accrued interest receivable, Fair Value	0	0	0	'
Derivative Asset, Fair Value, Gross Asset	0	0	0	'
Financial liabilities:	'	'	'	'
Deposits, Fair Value	0	0	0	'
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	0	0	0	'
Other Borrowings, Fair Value	0	0	0	'
Long-term Debt, Fair Value	0	'	'	'
Accrued interest payable, Fair Value	0	0	0	'
Derivative Liability, Fair Value, Gross Liability	0	0	0	'
Acquired Loans	'	'	'	'
Financial assets:	'	'	'	'
Net noncovered loans, Fair Value	3,825,751	'	'	'
Acquired Loans | Fair Value, Inputs, Level 1	'	'	'	'
Financial assets:	'	'	'	'
Net noncovered loans, Fair Value	0	'	'	'
Acquired Loans | Fair Value, Inputs, Level 2	'	'	'	'
Financial assets:	'	'	'	'
Net noncovered loans, Fair Value	0	'	'	'
Acquired Loans | Fair Value, Inputs, Level 3	'	'	'	'
Financial assets:	'	'	'	'
Net noncovered loans, Fair Value	$3,825,751	'	'	'

Fair_Value_Measurement_Narrati

Fair Value Measurement (Narrative) (Details Textual) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Jun. 30, 2013

Jun. 30, 2012

Dec. 31, 2011

Jul. 15, 2020

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Apr. 14, 2020

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Midwest

Midwest

Midwest

Midwest

George Washington

George Washington

George Washington

George Washington

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage Servicing Rights

$22,923,000

$21,291,000

$22,923,000

$21,291,000

$21,316,000

$22,604,000

$21,273,000

$21,179,000

'

'

'

'

'

'

'

'

Mortgage Servicing rights Valuation Allowance

572,000

4,078,000

572,000

4,078,000

2,564,000

482,000

3,488,000

3,539,000

'

'

'

'

'

'

'

'

Mortgage Servicing Rights Net Carrying balance

22,351,000

17,213,000

22,351,000

17,213,000

18,800,000

'

'

'

'

'

'

'

'

'

'

'

Mortgage Servicing Rights (MSR) Impairment (Recovery)

-90,000

-590,000

1,992,000

-539,000

1,000,000

'

'

'

'

'

'

'

'

'

'

'

Impaired Collateral Dependant Loans, Recorded Investment

51,300,000

52,500,000

51,300,000

52,500,000

57,800,000

'

'

'

'

'

'

'

'

'

'

'

Determination Of Specific Allowance For Loan Losses

3,100,000

8,500,000

3,100,000

8,500,000

3,300,000

'

'

'

'

'

'

'

'

'

'

'

Collateral Dependant Impaired and Non Accrual Loans Carrying Amount

48,100,000

44,000,000

48,100,000

44,000,000

54,500,000

'

'

'

'

'

'

'

'

'

'

'

Impairment of Real Estate

300,000

100,000

'

'

2,200,000

'

'

'

'

'

'

'

'

'

'

'

Impairment of Covered Other Real Esate Owned

200,000

200,000

'

'

1,700,000

'

'

'

'

'

'

'

'

'

'

'

Percent of available for sale securities classified as level 2

90.00%

'

90.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Level 3 investments in available for sale investment portfolio

9.91%

'

9.91%

'

'

'

'

'

'

'

'

'

'

'

'

'

True up liability, discount period

'10 years

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

True-up Liabitlity Discount Rate

3.59%

2.99%

3.59%

2.99%

'

'

'

'

'

'

'

'

'

'

'

'

True-up Liability Effect of Change in Discount Rate Increase By One Percent

800,000

'

800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

True-up Liability Effect of Change in Discount Rate Decrease by One Percent

700,000

'

700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

20,000,000

'

'

'

'

'

'

'

Percent of cumulative shared loss payments under loss sharing agreements

'

'

'

'

'

'

'

'

25.00%

'

'

'

25.00%

'

'

'

Estimated fair value of true up liability

'

'

'

'

'

'

'

'

'

7,300,000

7,600,000

7,700,000

'

4,200,000

4,600,000

5,000,000

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

'

'

'

Number of loans that were 90 days or more past due, or were any on nonaccrual status

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage_Servicing_Rights_and_2

Mortgage Servicing Rights and Mortgage Servicing Activity (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2013

Apr. 12, 2013

Dec. 31, 2012

Jun. 30, 2012

Dec. 31, 2011

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Mortage Servicing Rights Amortized Value [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage Servicing Rights Beginning of Period

$22,604

$21,273

$21,316

$21,179

$21,179

'

'

'

$0

$1,100

$1,065

$0

$0

Mortgage Servicing Rights Additions

1,450

1,408

4,151

4,597

'

'

'

'

'

'

'

'

'

Amortization of Mortgage Servicing Rights (MSRs)

-1,131

1,390

-3,609

4,485

'

'

'

'

'

'

'

'

'

Mortgage Servicing Rights, End of Period

22,923

21,291

22,923

21,291

21,316

'

'

'

0

1,100

1,065

0

0

Mortage Servicing Rights Valuation Rollforward [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage Servicing rights Valuation Allowance Beginning of Period

-482

-3,488

-2,564

-3,539

-3,539

'

'

'

'

'

'

'

'

Mortgage Servicing Rights (MSR) Impairment (Recovery)

-90

-590

1,992

-539

1,000

'

'

'

'

'

'

'

'

Mortgage Servicing rights Valuation Allowance, End of Period

-572

-4,078

-572

-4,078

-2,564

'

'

'

'

'

'

'

'

Mortgage Servicing Rights Net Carrying balance

22,351

17,213

22,351

17,213

18,800

'

'

'

'

'

'

'

'

Fair Value of Mortgage Servicing Rights

$22,616

[1]

$17,294

$22,616

[1]

$17,294

$18,833

[1]

$22,616

[1]

$18,833

$17,294

'

'

'

'

'

[1]

(b) - MSRs with a recorded investment of $22.9 million were reduced by a specific valuation allowance totaling $0.6 million to a reported carrying value of $22.4 million resulting in recognition of $0.1 million in recoveries included in loans sales and servicing income in the three months ended SeptemberB 30, 2013.

Mortgage_Servicing_Rights_and_3

Mortgage Servicing Rights and Mortgage Servicing Activity Mortgage Servicing Rights Assumptions Details (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Changes in Key Assumptions [Abstract]	'
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	10.56%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed	$750
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	1,456
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.86%
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	704
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	$1,362
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life	'98 months

Mortgage_Servicing_Rights_and_4

Mortgage Servicing Rights and Mortgage Servicing Activity (Details Textual) (USD $)

9 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2013

Dec. 31, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2013

Apr. 12, 2013

Dec. 31, 2012

Jun. 30, 2012

Dec. 31, 2011

Residential Mortgages

Residential Mortgages

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Citizens Republic Bancorp

Servicing Assets at Fair Value [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan servicing fees

'

'

'

'

'

'

$4,700,000

$4,200,000

'

'

'

'

'

Servicing Asset

'

'

'

'

'

'

2,700,000,000

2,400,000,000

'

'

'

'

'

Mortgage Servicing Rights

22,923,000

21,291,000

22,604,000

21,316,000

21,273,000

21,179,000

'

'

0

1,100,000

1,065,000

0

0

Unpaid principal balances from sale of residential mortgage loans

468,800,000

588,600,000

'

'

'

'

'

'

'

'

'

'

'

Recognized pretax gains

10,800,000

7,900,000

'

'

'

'

'

'

'

'

'

'

'

Related mortgage servicing rights from loans sold and receives servicing fees

$431,900,000

$560,900,000

'

'

'

'

'

'

'

'

'

'

'

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%

'

'

'

'

'

'

'

'

'

'

'

'

Commitments_and_Contingencies_1

Commitments and Contingencies (Schedule of Remaining Contractual Loan Commitments by Class) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'	'
Loan Commitments	$5,578,342	$4,151,541	$4,094,181
Commercial Loan	'	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'	'
Loan Commitments	3,521,227	2,431,023	2,406,226
Total consumer	'	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'	'
Loan Commitments	$2,057,115	$1,720,518	$1,687,955

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Guarantor Obligations) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified
Guarantor Obligations [Line Items]	'	'	'
Guarantor Obligations, Current Carrying Value	$272,111	$178,585	$165,042
Standby Letters of Credit	'	'	'
Guarantor Obligations [Line Items]	'	'	'
Guarantor Obligations, Current Carrying Value	221,229	136,202	125,791
Loans Sold with Recourse	'	'	'
Guarantor Obligations [Line Items]	'	'	'
Guarantor Obligations, Current Carrying Value	$50,882	$42,383	$39,251

Commitments_and_Contingencies_3

Commitments and Contingencies (Schedule of Changes in Repurchase Reserve) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 12, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'
Financing Receivable, Repurchase Reserve, Beginning Balance	$8,393	$2,013	$2,667	$1,743	'
Financing Receivable, Repurchase Reserve, Assumed Obligation	0	'	0	'	6,000
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	-3,053	-569	-1,983	-202	'
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	3,345	1,119	2,549	482	'
Financing Receivable, Repurchase Reserve, Ending Balance	8,959	2,293	8,959	2,293	'
Residential mortgages	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'
Financing Receivable, Repurchase Reserve, Beginning Balance	7,287	750	1,500	470	'
Financing Receivable, Repurchase Reserve, Assumed Obligation	0	'	0	'	6,000
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	-3,053	-569	-1,983	-202	'
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	3,403	1,199	2,546	552	'
Financing Receivable, Repurchase Reserve, Ending Balance	7,850	1,100	7,850	1,100	'
Manufactured Housing	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'
Financing Receivable, Repurchase Reserve, Beginning Balance	1,106	1,263	1,167	1,273	'
Financing Receivable, Repurchase Reserve, Assumed Obligation	0	'	0	'	0
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	0	0	0	0	'
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	-58	-80	3	-70	'
Financing Receivable, Repurchase Reserve, Ending Balance	$1,109	$1,193	$1,109	$1,193	'

Commitments_and_Contingencies_4

Commitments and Contingencies (Narratives) (Details) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]	'	'	'	'	'	'
Allowance for unfunded lending commitments	$8,500,000	'	$5,400,000	$5,800,000	'	'
Short-term guarantees	112,600,000	'	'	'	'	'
Allowance for loan loss associated with loans sold with recourse	9,000,000	'	2,700,000	2,300,000	'	'
Financing Receivable, Repurchase Reserve	8,959,000	8,393,000	2,667,000	2,293,000	2,013,000	1,743,000
Residential mortgages	'	'	'	'	'	'
Loss Contingencies [Line Items]	'	'	'	'	'	'
Financing Receivable, Loans Sold to Third Party Investors	41,400,000	'	32,500,000	28,500,000	'	'
Financing Receivable, Repurchase Reserve	7,850,000	7,287,000	1,500,000	1,100,000	750,000	470,000
Manufactured Housing	'	'	'	'	'	'
Loss Contingencies [Line Items]	'	'	'	'	'	'
Financing Receivable, Loans Sold to Third Party Investors	8,200,000	'	8,200,000	10,700,000	'	'
Financing Receivable, Repurchase Reserve	$1,109,000	$1,106,000	$1,167,000	$1,193,000	$1,263,000	$1,273,000

Changes_and_Reclassifications_2

Changes and Reclassifications Out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Total Reclassifications Out of OCI Current Period [Roll Forward]	'	'	'	'	'	'
Other Comprehensive Income (Loss), Arising During Period, Net of Tax	($11,716)	$4,884	($69,229)	$10,872	'	'
Accumulated Other Comprehensive Reclass Amounts During Period-Total	0	'	1,821	'	'	'
Accumulated other comprehensive loss	-83,613	-13,900	-83,613	-13,900	-71,897	-16,205
Unrealized securities gains and losses	'	'	'	'	'	'
Total Reclassifications Out of OCI Current Period [Roll Forward]	'	'	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	-11,990	'	-11,990	'	-274	55,418
Other Comprehensive Income (Loss), Arising During Period, Net of Tax	-11,716	'	-69,229	'	'	'
Accumulated Other Comprehensive Reclass Amounts During Period-Total	0	'	1,821	'	'	'
Pension and post- retirement costs	'	'	'	'	'	'
Total Reclassifications Out of OCI Current Period [Roll Forward]	'	'	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-71,623	'	-71,623	'	-71,623	-71,623
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	$0	'	$0	'	'	'

Changes_and_Reclassifications_3

Changes and Reclassifications Out of Accumulated Other Comprehensive Income Tax Effect of Changes and Reclassifications Out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Tax Effect of Changes and Reclassifications Out of Accumulated Other Comprehensive Income [Abstract]	'	'
Realized AFS Gross Realized Gain (Loss)	$0	$2,802
Tax expense (benefit) (35%)	0	-981
Reclassified amount, net of tax	$0	$1,821