FirstMerit (FMER) 10-Q 1 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	3 Months Ended
	Mar. 31, 2015	Apr. 28, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	FIRSTMERIT CORP /OH/
Entity Central Index Key	354869
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		165,787,937

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
ASSETS
Cash and due from banks	$426,247	$480,998	$520,976
Interest-bearing deposits in banks	106,178	216,426	438,309
Total cash and cash equivalents	532,425	697,424	959,285
Investment securities:
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,855,174	2,903,609	3,079,620
Available-for-sale	3,791,059	3,545,288	3,433,171
Other investments	148,475	148,654	148,446
Loans Held-for-sale, Fair Value Disclosure	3,568	13,428	7,143
Loans	15,490,889	15,326,147	14,608,613
Allowance for loan losses	-146,552	-143,649	-145,060
Net loans	15,344,337	15,182,498	14,463,553
Premises and equipment, net	320,392	332,297	323,335
Goodwill	741,740	741,740	741,740
Intangible assets	68,422	71,020	79,819
FDIC acquired other real estate	43,660	49,641	59,848
Accrued interest receivable and other assets	1,268,868	1,216,748	1,202,701
Total assets	25,118,120	24,902,347	24,498,661
Deposits:
Noninterest-bearing	5,666,752	5,786,662	5,595,899
Interest-bearing	3,277,118	3,028,888	3,081,658
Savings and money market accounts	8,610,553	8,399,612	8,750,182
Certificates and other time deposits	2,371,172	2,289,503	2,383,935
Total deposits	19,925,595	19,504,665	19,811,674
Federal funds purchased and securities sold under agreements to repurchase	1,113,371	1,272,591	926,195
Wholesale borrowings	316,628	428,071	349,277
Long-term debt	512,625	505,192	324,430
Accrued taxes, expenses and other liabilities	361,115	357,547	344,119
Total liabilities	22,229,334	22,068,066	21,755,695
Shareholders' equity:
Preferred Stock, Value, Issued	100,000	100,000	100,000
Common Stock warrant	3,000	3,000	3,000
Common Stock, without par value; authorized 300,000,000 shares; issued: March 31, 2015, December 31, 2014 and March 31, 2014 - 170,183,540 shares	127,937	127,937	127,937
Capital surplus	1,394,933	1,393,090	1,393,749
Accumulated other comprehensive loss	-49,267	-71,892	-55,504
Retained earnings	1,433,926	1,404,717	1,303,626
Treasury stock, at cost: March 31, 2015 - 4,730,374; December 31, 2014 - 4,793,566 shares; March 31, 2014 - 5,096,157 shares	-121,743	-122,571	-129,842
Total shareholders' equity	2,888,786	2,834,281	2,742,966
Total liabilities and shareholders' equity	$25,118,120	$24,902,347	$24,498,661

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Statement of Financial Position [Abstract]
Common stock, shares authorized	300,000,000	300,000,000	300,000,000
Common stock, shares issued		170,183,540	170,183,540
5.875% Non-Cumulative Perpetual Preferred stock, Series A, authorized 115,000 shares	115,000	115,000	115,000
5.875% Non-Cumulative Perpetual Preferred stock, Series A, 100,000 outstanding	100,000	100,000	100,000
Treasury stock, at cost	4,730,374	4,793,566	5,096,157

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans and loans held for sale	$161,539	$170,514
Investment securities:
Taxable	31,950	32,022
Tax-exempt	6,026	5,340
Total investment securities interest	37,976	37,362
Total interest income	199,515	207,876
Deposits:
Interest bearing	767	737
Savings and money market accounts	5,547	5,559
Certificates and other time deposits	2,177	2,464
Federal funds purchased and securities sold under agreements to repurchase	243	197
Wholesale borrowings	2,340	1,129
Long-term debt	2,818	3,890
Total interest expense	13,892	13,976
Net interest income	185,623	193,900
Provision for Loan and Lease Losses	8,248	14,536
Net interest income after provision for loan losses	177,375	179,364
Noninterest income:
Trust department income	10,149	9,748
Service charges on deposits	15,668	16,648
Credit card fees	12,649	12,152
ATM and other service fees	6,099	5,819
Bank owned life insurance income	3,592	3,582
Investment services and insurance	3,704	3,516
Investment securities gains/(losses), net	354	56
Loan sales and servicing income	1,600	3,730
Other operating income	12,032	12,019
Total noninterest income	65,847	67,270
Noninterest expense:
Salaries, wages, pension and employee benefits	90,526	89,013
Net occupancy expense	15,954	17,014
Equipment expense	11,025	11,911
Stationery, supplies and postage	3,528	4,108
Bankcard, loan processing and other costs	11,139	10,834
Professional services	4,010	5,359
Amortization of intangibles	2,598	2,936
FDIC insurance expense	5,167	5,971
Other operating expense	16,705	22,185
Total noninterest expense	160,652	169,331
Income before income tax expense	82,570	77,303
Income tax expense	25,431	23,848
Net income	57,139	53,455
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	407	380
Preferred Stock Dividends, Income Statement Impact	1,469	1,469
Net income attributable to common shareholders	55,263	51,606
Net income used in diluted EPS calculation	$55,263	$51,606
Weighted average number of common shares outstanding - basic	165,411	165,060
Weighted average number of common shares outstanding - diluted	166,003	166,004
Basic earnings per common share	$0.33	$0.31
Diluted earnings per common share	$0.33	$0.31
Cash dividend per common share	$0.16	$0.16

Statement_of_Comprehensive_Inc

Statement of Comprehensive Income Statement of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income, Pretax	$82,570	$77,303
Net Income, Tax	25,431	23,848
Net Income, After Tax	57,139	53,455
Changes in unrealized securities' holding gains/(losses), before Tax	34,117	18,044
Changes in unrealized securities' holding gains/(losses), Tax	11,941	6,315
Changes in unrealized securities' holding gains/(losses), Net of Tax	22,176	11,729
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity, before Tax	-504	-494
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity, Tax	-176	-173
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity , Net of Tax	-328	-321
Net losses/(gains) realized on sale of securities reclassified to noninterest income, before Tax	-354	-56
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Tax	-124	-20
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Net of Tax	-230	-36
Net change in unrealized gains/(losses) on securities available for sale, before Tax	33,259	17,494
Net change in unrealized gains/(losses) on securities available for sale, Tax	11,641	6,122
Net change in unrealized gains/(losses) on securities available for sale, Net of Tax	21,618	11,372
Amortization of actuarial losses/(gains), before Tax	1,138
Amortization of actuarial losses/(gains), Tax	398	0
Amortization of actuarial losses/(gains), Net of Tax	740
Amortization of prior service cost reclassified to other noninterest expense, before Tax	-410
Amortization of prior service cost reclassified to other noninterest expense, Tax	-143	0
Amortization of prior service cost reclassified to other noninterest expense, Net of Tax	-267	0
Net change from defined benefit pension plans, before Tax	1,548
Net change from defined benefit pension plans, Tax	541
Net change from defined benefit pension plans, Net of Tax	1,007
Total other comprehensive gains/(losses), before Tax	34,807	17,494
Total other comprehensive gains/(losses), Tax	12,182	6,122
Total other comprehensive gains/(losses), Net of Tax	22,625	11,372
Comprehensive Income, before Tax, Portion Attributable to Parent	117,377	94,797
Comprehensive Income, Tax, Portion Attributable to Parent	37,613	29,970
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$79,764	$64,827

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, unless otherwise specified
Beginning Balance at Dec. 31, 2013	$2,702,894	$100,000	$127,937	$3,000	$1,390,643	($66,876)	$1,277,975	($129,785)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,455						53,455
Total other comprehensive gains/(losses), Net of Tax	11,372					11,372
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	64,827					11,372	53,455
Dividends, Preferred Stock, Cash	-1,469						-1,469
Cash dividends - common stock	-26,335						-26,335
Nonvested (restricted) shares granted	0				-1,485			1,485
Restricted Stock Activity	-717				419			-1,136
Deferred compensation trust	0				406			-406
Share-based compensation	3,766				3,766
Ending Balance at Mar. 31, 2014	2,742,966	100,000	127,937	3,000	1,393,749	-55,504	1,303,626	-129,842
Beginning Balance at Dec. 31, 2014	2,834,281	100,000	127,937	3,000	1,393,090	-71,892	1,404,717	-122,571
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,139	0	0	0	0	0	57,139	0
Total other comprehensive gains/(losses), Net of Tax	22,625					22,625
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						22,625	57,139
Dividends, Preferred Stock, Cash	-1,469	0	0	0	0	0	-1,469	0
Cash dividends - common stock	-26,461			0		0	-26,461	0
Nonvested (restricted) shares granted	0			0	-2,631	0	0	2,631
Restricted Stock Activity	970			0	-326	0	0	1,296
Deferred compensation trust	0			0	-507	0	0	507
Share-based compensation	-3,641			0	-3,641	0	0	0
Ending Balance at Mar. 31, 2015	$2,888,786	$100,000	$127,937	$3,000	$1,394,933	($49,267)	$1,433,926	($121,743)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (parenthetical)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	0

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$57,139	$53,455
Adjustments to reconcile net income to net cash provided and used by operating activities:
Provision for loan losses	8,248	14,536
Increase (Decrease) in Provision for Deferred Income Taxes	-1,663	3,081
Depreciation, Depletion and Amortization	14,739	8,367
Benefit attributable to FDIC loss share	4,227	4,824
Accretion of acquired loans	-26,339	-37,965
Amortization and accretion of investment securities, net
Available for sale	2,680	1,949
Held to maturity	814	2,089
Losses/(gains) on sales and calls of available-for-sale investment securities, net	-354	-56
Originations of loans held for sale	-40,442	-61,109
Proceeds from sales of loans, primarily mortgage loans sold in the secondary markets	50,868	66,904
Gains on sales of loans, net	-566	-1,316
Amortization of Intangible Assets	2,598	2,936
Share-based Compensation	3,641	3,766
Net decrease/(increase) in other assets	-48,684	6,506
Net increase/(decrease) in other liabilities	25,224	26,800
NET CASH PROVIDED BY OPERATING ACTIVITIES	52,130	94,767
Proceeds from sale of investment securities
Available for sale	39,302	7,809
Proceeds from Sale of Other Investments	0	32,486
Held to maturity	1,015	2,495
Proceeds from prepayments, calls, and maturities of investment securities
Available for sale	129,296	112,747
Held to maturity	92,241	61,734
Proceeds from Sale and Maturity of Other Investments	166	0
Purchases of investment securities
Available for sale	-404,163	-245,403
Held to maturity	-46,164	-214,611
Other	0	-142
Net decrease/(increase) in loans and leases	-152,359	-277,708
Purchases of premises and equipment	-5,795	-16,859
Sales of premises and equipment	7,965	11,259
NET CASH PROVIDED/(USED) BY INVESTING ACTIVITIES	-338,496	-526,193
Financing Activities
Net increase in demand accounts	128,320	191,793
Net increase/(decrease) in savings and money market accounts	210,941	163,015
Net decrease in certificates and other time deposits	81,669	-76,735
Net increase/(decrease) in securities sold under agreements to repurchase	-159,220	74,660
Net increase/(decrease) in long-term debt	0	0
Net increase/(decrease) in wholesale borrowings	-111,443	148,677
Net proceeds from issuance of preferred stock	0	0
Cash dividends - common	-26,461	-26,335
Cash dividends - preferred	-1,469	-1,469
Restricted stock activity	-970	-717
NET CASH PROVIDED/(USED) BY FINANCING ACTIVITIES	121,367	472,889
Increase/(Decrease) in cash and cash equivalents	-164,999	41,463
Cash and cash equivalents at beginning of year	697,424	917,822
Cash and cash equivalents at end of year	532,425	959,285
Cash paid during period for:
Interest	14,036	11,140
Federal income taxes	$2,000	$0

Significant_Accounting_Policie

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Significant Accounting Policies	FirstMerit Corporation and subsidiaries is a diversified financial services company headquartered in Akron, Ohio with 384 banking offices in the Ohio, Michigan, Wisconsin, Illinois, and Pennsylvania areas. The Corporation provides a complete range of banking and other financial services to consumers and businesses through its core operations.
	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, and FirstMerit Risk Management, Inc. 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, 2014 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 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. 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 March 31, 2015 and 2014 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, 2014 (the “2014 Form 10-K”). There have been no significant changes in the current quarter to the Corporation’s accounting policies as disclosed in the 2014 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 Accounting Standards
	FASB ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure—a consensus of the FASB Emerging Issues Task Force. The objective of this update is to reduce diversity in practice by addressing the classification of certain foreclosed mortgage loans held by creditors that are either fully or partially guaranteed under government programs. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the
	following conditions are met: 1) the loan has a government guarantee that is not separable from the
	loan before foreclosure; 2) at the time of foreclosure, the creditor has the intent to convey the real
	estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and 3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The ASU is effective for interim and annual periods beginning after December 15, 2014. The amendments can be adopted using either a prospective transition method or a modified retrospective transition method. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	FASB ASU 2014-11, Transfers and Servicing: Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this update require entities to account for repurchase-to-maturity transactions as secured borrowings (rather than as sales with forward repurchase agreements), eliminate accounting guidance on linking repurchase financing transactions, and expand disclosure requirements related to certain transfers of financial assets that are accounted for as sales and certain transfers, such as repos, securities lending transactions, and repurchase-to-maturity transactions, accounted for as secured borrowings. The amendments in ASU 2014-11 are effective for the first interim or annual period beginning after December 15, 2014. The amendments must present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Early application is prohibited. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	FASB ASU 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update change the definition of a discontinued operation in ASC 205-20 and require additional disclosures for transactions that meet the definition of a discontinued operation and certain other significant transactions that do not meet the discontinued operations criteria. The amendments in ASU 2014-08 are effective prospectively for all disposals, except disposals classified as held for sale before the adoption date or components initially classified as held for sale in periods beginning on or after December 15, 2014, with early adoption permitted. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 amends the guidance in ASC 310-40 by clarifying when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan. Additionally, the amendments require interim and annual disclosure of both 1) the amount of foreclosed residential real estate property held by the creditor and 2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in ASU 2014-04 are effective for annual periods, and interim period within those annual periods, beginning after December 15, 2014. The amendments can either be adopted using a modified retrospective or a prospective transition method. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	Recently Issued Accounting Standards
	FASB ASU 2015-5, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The amendments in ASU 2015-05 provide guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance will not change GAAP for a customer’s accounting for service contracts. In addition, the guidance in this Update supersedes paragraph 350-40-25-16. Consequently, all software licenses within the scope of Subtopic 350-40 will be accounted for consistent with other licenses of intangible assets. The amendments are effective for public business entities for annual and interim periods within those annual periods, beginning after December 15, 2015. An entity can elect to adopt the amendments either (1) prospectively to all arrangements entered into or materially modified after the effective date or (2) retrospectively. For prospective transition, the only disclosure requirements at transition are the nature of and reason for the change in accounting principle, the transition method, and a qualitative description of the financial statement line items affected by the change. For retrospective transition, the disclosure requirements
	at transition include the requirements for prospective transition and quantitative information about the effects of the accounting change. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.
	FASB ASU 2015-3, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from that debt liability, consistent with the presentation of a debt discount. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. For public business entities, the amendments in this Update are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. The adoption of this guidance is not expected to have a material effect on the Corporations financial position or results of operations.
	FASB ASU 2015-2, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. These amendments modify the evaluation of whether limited partnerships and other similar entities are variable interest entities; eliminate the presumption that a general partner should consolidate a limited partnership; affect the consolidation analysis that are involved with variable interest entities; and provide a scope exception from consolidation for entities that are required to comply or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. A reporting entity may apply the amendments using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption. A reporting entity also may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material effect on the Corporations financial position or results of operations.
	FASB ASU 2014–12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period — a consensus of the FASB Emerging Issues Task Force. The amendments in this update clarify that entities should treat performance targets that can be met after the requisite service period of a share-based payment award as performance conditions that affect vesting. Therefore, an entity would not record compensation expense (measured as of the grant date without taking into account the effect of the performance target) related to an award for which transfer to the employee is contingent on the entity’s satisfaction of a performance target until it becomes probable that the performance target will be met. The ASU does not contain any new disclosure requirements. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. In addition, entities will have the option of applying the guidance either prospectively (i.e., only to awards granted or modified on or after the effective date) or retrospectively. Retrospective application would only apply to awards with performance targets outstanding at or after the beginning of the first annual period presented (i.e., the earliest presented comparative period). The adoption of this guidance is not expected to have a material effect on the Corporations financial position or results of operations.
	FASB ASU 2014-09, Revenue from Contracts with Customers. The amendments in this update supersede virtually all existing GAAP revenue recognition guidance, including most industry-specific revenue recognition guidance. ASU 2014-09 creates a single, principle-based revenue recognition framework and will require entities to apply significantly more judgment and expanded disclosures surrounding revenue recognition. The core principle requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 applies to contracts with customers to provide goods and services, with certain exclusions such as lease contracts, financing arrangements, and financial instruments. The amendments in ASU 2014-09 are effective for fiscal years beginning after December 15, 2016. On April 1, 2015, the FASB proposed to defer the effective date by one year, permitting public organizations to apply this guidance to annual reporting periods beginning after December 15, 2017, with early adoption permitted, but not before the original public organization effective date. The amendments can be adopted using either the full retrospective approach or a modified retrospective approach. Early adoption is prohibited. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	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.
			March 31, 2015
	(In thousands)		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. treasury notes & bonds	$	—			$	—			$	—			$	—
		U.S. government agency debentures	2,500				13				—				2,513
		U.S. states and political subdivisions	208,800				6,750				(386		)		215,164
		Residential mortgage-backed securities:
		U.S. government agencies	924,453				24,799				(1,949		)		947,303
		Commercial mortgage-backed securities:
		U.S. government agencies	139,789				1,231				(661		)		140,359
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,895,112				11,305				(13,857		)		1,892,560
		Non-agency	6				—				—				6
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	241,839				2,602				(382		)		244,059
		Asset-backed securities:
		Collateralized loan obligations	297,506				587				(4,131		)		293,962
		Corporate debt securities	61,668				—				(9,404		)		52,264
		Total debt securities	3,771,673				47,287				(30,770		)		3,788,190
	Equity securities
		Marketable equity securities	2,869				—				—				2,869
		Non-marketable equity securities	—				—				—				—
		Total equity securities	2,869				—				—				2,869
		Total securities available-for-sale	$	3,774,542			$	47,287			$	(30,770	)		$	3,791,059
	Securities held-to-maturity
	Debt securities
		U.S. treasury notes & bonds	$	5,000			$	—			$	—			$	5,000
		U.S. government agency debentures	25,000				—				(178		)		24,822
		U.S. states and political subdivisions	523,501				8,864				(1,147		)		531,218
		Residential mortgage-backed securities:
		U.S. government agencies	577,278				10,745				(1,677		)		586,346
		Commercial mortgage-backed securities:
		U.S. government agencies	57,818				765				(108		)		58,475
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,320,215				1,959				(24,846		)		1,297,328
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	256,352				1,659				(3,377		)		254,634
		Corporate debt securities	90,010				1,079				—				91,089
		Total securities held-to-maturity	$	2,855,174			$	25,071			$	(31,333	)		$	2,848,912
			December 31, 2014
	(In thousands)		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. government agency debentures	$	2,500			$	—			$	(18	)		$	2,482
		U.S. states and political subdivisions	221,052				6,756				(466		)		227,342
		Residential mortgage-backed securities:
		U.S. government agencies	951,839				22,377				(3,218		)		970,998
		Commercial mortgage-backed securities:
		U.S. government agencies	104,176				598				(1,371		)		103,403
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,698,015				4,777				(26,225		)		1,676,567
		Non-agency	7				—				—				7
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	222,876				863				(1,405		)		222,334
		Asset-backed securities:
		Collateralized loan obligations	297,446				11				(9,613		)		287,844
		Corporate debt securities	61,652				—				(10,315		)		51,337
		Total debt securities	3,559,563				35,382				(52,631		)		3,542,314
	Equity securities
	Marketable equity securities	2,974				—				—				2,974
	Total equity securities	2,974				—				—				2,974
	Total securities available-for-sale	$	3,562,537			$	35,382			$	(52,631	)		$	3,545,288
Securities held-to-maturity
Debt securities
	U.S. treasury notes & bonds	$	5,000			$	—			$	—			$	5,000
	U.S. government agency debentures	25,000				—				(537		)		24,463
	U.S. states and political subdivisions	517,824				12,645				(191		)		530,278
	Residential mortgage-backed securities:
	U.S. government agencies	580,727				7,495				(3,045		)		585,177
	Commercial mortgage-backed securities:
	U.S. government agencies	58,143				281				(329		)		58,095
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,368,534				718				(38,875		)		1,330,377
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	257,642				557				(6,768		)		251,431
	Corporate debt securities	90,739				412				(52		)		91,099
	Total securities held-to-maturity	$	2,903,609			$	22,108			$	(49,797	)		$	2,875,920
		March 31, 2014
(In thousands)		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
		Cost												Value
Securities available-for-sale
Debt securities
	U.S. states and political subdivisions	$	245,534			$	7,541			$	(2,095	)		$	250,980
	Residential mortgage-backed securities:
	U.S. government agencies	1,013,085				21,415				(10,506		)		1,023,994
	Commercial mortgage-backed securities:
	U.S. government agencies	87,258				36				(2,161		)		85,133
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,586,051				3,857				(41,804		)		1,548,104
	Non-agency	8				—				—				8
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	173,951				331				(1,813		)		172,469
	Asset-backed securities:
	Collateralized loan obligations	297,293				958				(3,692		)		294,559
	Corporate debt securities	61,610				—				(10,022		)		51,588
	Total debt securities	3,464,790				34,138				(72,093		)		3,426,835
Equity Securities
	Marketable equity securities	3,055				—				—				3,055
	Non-marketable equity securities	3,281				—				—				3,281
	Total equity securities	6,336				—				—				6,336
	Total securities available-for-sale	$	3,471,126			$	34,138			$	(72,093	)		$	3,433,171
Securities held-to-maturity
Debt securities
	U.S. treasury notes & bonds	$	4,999			$	6			$	—			$	5,005
	U.S. government agency debentures	25,000				—				(1,117		)		23,883
	U.S states and political subdivisions	517,221				159				(7,186		)		510,194
	Residential mortgage-backed securities:
	U.S. government agencies	644,820				2,311				(8,584		)		638,547
	Commercial mortgage-backed securities:
	U.S. government agencies	56,339				32				(877		)		55,494
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,488,641				—				(64,734		)		1,423,907
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	249,688				138				(9,749		)		240,077
	Corporate debt securities	92,912				437				(295		)		93,054
	Total securities held-to-maturity	$	3,079,620			$	3,083			$	(92,542	)		$	2,990,161
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. 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. As illustrated in the tables below, the aggregate fair value of the Corporation's general obligation bonds was greater than $10.0 million in eleven of the thirty-seven U.S. states in which it holds investments.
(Dollars in thousands)	March 31, 2015
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Ohio	136			$	925			$	124,908			$	125,864
Michigan	164			857				138,091				140,620
Illinois	62			1,841				111,649				114,150
Wisconsin	73			760				53,877				55,497
Texas	63			784				48,388				49,396
Pennsylvania	46			1,018				46,085				46,816
Minnesota	35			697				23,821				24,405
Washington	31			930				28,194				28,836
New Jersey	37			747				26,724				27,623
Missouri	15			1,098				16,032				16,472
New York	19			629				11,646				11,948
Other	121			639				76,127				77,365
Total general obligation bonds	802			$	896			$	705,542			$	718,992
(Dollars in thousands)	December 31, 2014
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Ohio	137			$	979			$	130,741			$	134,127
Michigan	169			842				138,325				142,292
Illinois	66			1,897				121,560				125,169
Wisconsin	77			841				62,543				64,776
Texas	64			801				50,307				51,293
Pennsylvania	45			1,000				44,443				45,006
Minnesota	42			674				27,740				28,326
Washington	30			952				27,987				28,558
New Jersey	37			746				26,755				27,612
Missouri	19			1,011				18,764				19,207
New York	19			628				11,659				11,929
Other	120			650				76,849				78,020
Total general obligation bonds	825			$	917			$	737,673			$	756,315
(Dollars in thousands)	March 31, 2014
U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
Ohio	153			$	1,033			$	159,883			$	158,074
Illinois	72			1,496				107,451				107,717
Texas	68			779				52,807				52,941
Pennsylvania	51			969				50,579				49,428
Wisconsin	87			683				58,635				59,428
Minnesota	42			672				27,925				28,213
New Jersey	37			744				26,844				27,518
Michigan	171			789				135,588				134,965
Washington	30			940				28,292				28,210
Missouri	19			1,012				18,904				19,232
New York	22			594				13,046				13,075
Other	129			634				82,317				81,807
Total general obligation bonds	881			$	863			$	762,271			$	760,608
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 of revenue, financial 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 March 31, 2015 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 constitutes the majority of other investments on the Consolidated Balance Sheets.
(In thousands)	31-Mar-15				31-Dec-14				31-Mar-14
FRB stock	$	55,681			$	55,681			$	55,435
FHLB stock	92,381				92,547				92,547
Other	413				426				464
Total other investments	$	148,475			$	148,654			$	148,446
FRB and FHLB stock is classified as a restricted investment, carried at cost and valued based on the ultimate recoverability of par value. Cash and stock dividends received on the stock are reported as interest income. There are no identified events or changes in circumstances that may have a significant adverse effect on these investments carried at cost.
Securities with a carrying value of $3.5 billion, $2.8 billion, and $3.4 billion at March 31, 2015, December 31, 2014, and March 31, 2014, 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 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 March 31,
(In thousands)	2015				2014
Realized gains	$	392			$	220
Realized losses	(38		)		(164		)
Net securities (losses)/gains	$	354			$	56
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.
			March 31, 2015
			Less than 12 months										12 months or longer									Total
(In thousands)			Fair Value				Unrealized				Number Impaired		Fair Value			Unrealized				Number		Fair Value				Unrealized
							Losses				Securities					Losses				Impaired						Losses
																				Securities
Securities available-for-sale
Debt securities
	U.S. treasury notes & bonds		$	—			$	—			0		$	—		$	—			0		$	—			$	—
	U.S. states and political subdivisions		14,380				(117		)		23		6,004			(269		)		10		20,384				(386		)
	Residential mortgage-backed securities:
	U.S. government agencies		74,517				(360		)		5		108,052			(1,589		)		8		182,569				(1,949		)
	Commercial mortgage-backed securities:
	U.S. government agencies		49,129				(175		)		7		17,690			(486		)		2		66,819				(661		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		70,574				(762		)		6		745,621			(13,095		)		53		816,195				(13,857		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		13,206				(24		)		2		61,132			(358		)		6		74,338				(382		)
	Asset-backed securities:
	Collateralized loan obligations		24,087				(209		)		3		181,498			(3,922		)		27		205,585				(4,131		)
	Corporate debt securities		—				—				0		52,263			(9,404		)		8		52,263				(9,404		)
	Total securities available-for-sale		$	245,893			$	(1,647	)		46		$	1,172,260		$	(29,123	)		114		$	1,418,153			$	(30,770	)
Securities held-to-maturity
Debt securities
	U.S. treasury notes & bonds		$	5,000			$	—			1		$	—		$	—			0		$	5,000			$	—
	U.S. government agency debentures		$	—			$	—			0		$	24,822		$	(178	)		1		$	24,822			$	(178	)
	U.S. states and political subdivisions		38,202				(1,093		)		26		4,448			(54		)		6		42,650				(1,147		)
	Residential mortgage-backed securities:
	U.S. government agencies		28,386				(123		)		2		110,329			(1,554		)		6		138,715				(1,677		)
	Commercial mortgage-backed securities:
	U.S. government agencies		—				—				0		9,554			(108		)		1		9,554				(108		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		19,016				(71		)		1		1,095,375			(24,775		)		56		1,114,391				(24,846		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		—				—				0		144,970			(3,377		)		13		144,970				(3,377		)
	Collateralized loan obligations:
	Non-agency		—				—				0		—			—				0		—				—
	Corporate debt securities		—				—				0		—			—				0		—				—
	Total securities held-to-maturity		$	90,604			$	(1,287	)		30		$	1,389,498		$	(30,046	)		83		$	1,480,102			$	(31,333	)
			December 31, 2014
			Less than 12 months											12 months or longer										Total
(In thousands)			Fair Value				Unrealized				Number			Fair Value			Unrealized				Number			Fair Value				Unrealized
							Losses				Impaired						Losses				Impaired Securities							Losses
											Securities
Securities available-for-sale
Debt securities:
	U.S. government agency debentures		$	2,482			$	(18	)		1			$	—		$	—			—			$	2,482			$	(18	)
	U.S. states and political subdivisions		5,637				(11		)		11			22,528			(455		)		36			28,165				(466		)
	Residential mortgage-backed securities:
	U.S. government agencies		50,126				(182		)		5			199,773			(3,036		)		14			249,899				(3,218		)
	Commercial mortgage-backed securities:
	U.S. government agencies		12,284				(55		)		2			45,485			(1,316		)		6			57,769				(1,371		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		243,970				(906		)		15			905,478			(25,319		)		64			1,149,448				(26,225		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		31,375				(229		)		4			67,169			(1,176		)		7			98,544				(1,405		)
	Asset-backed securities:
	Collateralized loan obligations		79,042				(1,406		)		15			193,687			(8,207		)		27			272,729				(9,613		)
	Corporate debt securities		—				—				—			51,338			(10,315		)		8			51,338				(10,315		)
	Total securities available-for-sale		$	424,916			$	(2,807	)		53			$	1,485,458		$	(49,824	)		162			$	1,910,374			$	(52,631	)
Securities held-to-maturity
Debt securities:
	U.S. government agency debentures		$	—			$	—			—			$	24,463		$	(537	)		1			$	24,463			$	(537	)
	U.S. states and political subdivisions		9,085				(17		)		9			18,371			(174		)		21			27,456				(191		)
	Residential mortgage-backed securities:
	U.S. government agencies		—				—				—			185,361			(3,045		)		10			185,361				(3,045		)
	Commercial mortgage-backed securities:
	U.S. government agencies		9,950				(4		)		2			16,735			(325		)		2			26,685				(329		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		28,333				(149		)		3			1,161,297			(38,726		)		58			1,189,630				(38,875		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		41,474				(55		)		3			171,570			(6,713		)		16			213,044				(6,768		)
	Corporate debt securities		36,933				(52		)		13			—			—				—			36,933				(52		)
	Total securities held-to-maturity		$	125,775			$	(277	)		30			$	1,577,797		$	(49,520	)		108			$	1,703,572			$	(49,797	)
			March 31, 2014
			Less than 12 months											12 months or longer										Total
(In thousands)			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		$	32,307			$	(937	)		53			$	17,231		$	(1,158	)		29			$	49,538			$	(2,095	)
	Residential mortgage-backed securities:
	U.S. government agencies		399,152				(9,543		)		28			15,013			(963		)		3			414,165				(10,506		)
	Commercial mortgage-backed securities:
	U.S. government agencies		63,129				(1,206		)		8			16,891			(955		)		2			80,020				(2,161		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		966,458				(28,054		)		62			273,543			(13,750		)		18			1,240,001				(41,804		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		90,804				(1,475		)		8			6,014			(338		)		2			96,818				(1,813		)
	Asset-backed securities:
	Collateralized loan obligations		201,854				(3,692		)		28			—			—				—			201,854				(3,692		)
	Corporate debt securities		—				—				—			51,588			(10,022		)		8			51,588				(10,022		)
	Total securities available-for-sale		$	1,753,704			$	(44,907	)		187			$	380,281		$	(27,186	)		63			$	2,133,985			$	(72,093	)
Securities held-to-maturity
Debt securities
	U.S. government agency debentures		$	23,883			$	(1,117	)		1			$	—		$	—			—			$	23,883			$	(1,117	)
	U.S. states and political subdivisions		476,766				(6,833		)		735			15,544			(353		)		14			492,310				(7,186		)
	Residential mortgage-backed securities:
	U.S. government agencies		295,148				(7,471		)		16			19,730			(1,113		)		1			314,878				(8,584		)
	Commercial mortgage-backed securities:
	U.S. government agencies		50,533				(877		)		8			—			—				—			50,533				(877		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		865,651				(36,384		)		42			558,256			(28,350		)		27			1,423,907				(64,734		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		200,487				(8,507		)		18			19,459			(1,242		)		2			219,946				(9,749		)
	Corporate debt securities		62,051				(295		)		22			—			—				—			62,051				(295		)
	Total securities held-to-maturity		$	1,974,519			$	(61,484	)		842			$	612,989		$	(31,058	)		44			$	2,587,508			$	(92,542	)
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. 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 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 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.
The investment securities portfolio was in a net unrealized gain position of $10.3 million at March 31, 2015, compared to a net unrealized loss position of $44.9 million at December 31, 2014 and a net unrealized loss position of $127.4 million at March 31, 2014. Gross unrealized losses were $62.1 million as of March 31, 2015, compared to $102.4 million at December 31, 2014, and $164.6 million at March 31, 2014. As of March 31, 2015, gross unrealized losses are concentrated within agency MBS, CLOs, and corporate debt securities. Lower term interest rates have positively impacted MBS prices quarter to date while a favorable macro economy and belief that oil and gas related losses are well contained have resulted in tighter CLO spreads. Corporate debt securities are composed of eight, single issuer, trust preferred securities with stated maturities. Such investments are less than 1% of the fair value of the entire investment portfolio. None of the corporate issuers have deferred paying dividends on their issued trust preferred shares in which the Corporation is invested. The fair values of these investments have been impacted by the market conditions which have caused risk premiums to increase, resulting in the decline in the fair value of the trust preferred securities.
Management believes the Corporation will fully recover the cost of these agency MBSs, CLOs, and corporate debt securities, and it does not intend to sell these securities and it is not more likely than not that it will be required to sell them before the anticipated recovery of the remaining amortized cost basis, which may be maturity. As a result, Management concluded that these securities were not other-than-temporarily impaired at March 31, 2015 and has recognized the total amount of the impairment in OCI, net of tax.
The Corporation also holds $294.0 million of CLOs with a gross unrealized loss position of $4.1 million as of March 31, 2015. The new Volcker regulations, as originally adopted, may affect the Corporation's ability to hold these CLOs. Management believes that its holdings of CLOs are not ownership interests in a covered fund prohibited by the Volcker regulations and, therefore, expects to be able to hold these investments until their stated maturities with no restriction.
Contractual Maturity of Debt Securities
The following table shows the remaining contractual maturities and contractual yields of debt securities held-to-maturity and available-for-sale as of March 31, 2015. Estimated lives on MBSs may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

Loans

Loans	3 Months Ended
	Mar. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Financing Receivables	Loans
	Loans outstanding as of March 31, 2015, December 31, 2014, and March 31, 2014, net of unearned income, consisted of the following:
	(In thousands)		March 31, 2015				December 31, 2014				March 31, 2014
	Originated loans:
	Commercial		$	8,031,892			$	7,830,085			$	7,083,192
	Residential mortgage		639,980				625,283				555,971
	Installment		2,500,288				2,393,451				1,835,522
	Home equity		1,134,238				1,110,336				946,802
	Credit cards		160,766				164,478				147,917
	Leases		388,873				370,179				257,509
		Total originated loans	12,856,037				12,493,812				10,826,913
	Allowance for originated loan losses		(97,545		)		(95,696		)		(92,116		)
		Net originated loans	$	12,758,492			$	12,398,116			$	10,734,797
	Acquired loans:
	Commercial		$	1,011,170			$	1,086,899			$	1,562,878
	Residential mortgage		378,192				394,484				446,374
	Installment		717,693				764,168				943,354
	Home equity		217,824				233,629				283,309
		Total acquired loans	2,324,879				2,479,180				3,235,915
	Allowance for acquired loan losses		(7,493		)		(7,457		)		(2,974		)
		Net acquired loans	$	2,317,386			$	2,471,723			$	3,232,941
	FDIC acquired loans:
	Commercial		$	179,547			$	211,607			$	341,267
	Residential mortgage		40,470				41,276				49,411
	Installment		4,781				4,874				5,531
	Home equity		65,170				73,365				94,828
	Loss share receivable		20,005				22,033				54,748
		Total FDIC acquired loans	309,973				353,155				545,785
	Allowance for FDIC acquired loan losses		(41,514		)		(40,496		)		(49,970		)
		Net FDIC acquired loans	$	268,459			$	312,659			$	495,815
	Total loans:
	Commercial		$	9,222,609			$	9,128,591			$	8,987,337
	Residential mortgage		1,058,642				1,061,043				1,051,756
	Installment		3,222,762				3,162,493				2,784,407
	Home equity		1,417,232				1,417,330				1,324,939
	Credit cards		160,766				164,478				147,917
	Leases		388,873				370,179				257,509
	Loss share receivable		20,005				22,033				54,748
		Total loans	15,490,889				15,326,147				14,608,613
	Total allowance for loan losses		(146,552		)		(143,649		)		(145,060		)
		Total Net loans	$	15,344,337			$	15,182,498			$	14,463,553
	The following describes the distinction between originated, acquired and FDIC acquired 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, 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 $4.6 million, $5.4 million, and $7.1 million at March 31, 2015, December 31, 2014, and March 31, 2014, respectively.
	Acquired Loans
	Acquired loans are those purchased in the Citizens acquisition. These loans were recorded at estimated fair value at the Acquisition Date with no carryover of the related ALL. The acquired loans were segregated as of the Acquisition Date between those considered to be performing (acquired nonimpaired loans) and those with evidence of credit deterioration (acquired impaired loans). Acquired loans are considered impaired if there is evidence of credit deterioration and if it is probable, at acquisition, all contractually required payments will not be collected. Revolving loans, including lines of credit, are excluded from acquired impaired loan accounting.
	Total outstanding acquired impaired loans as of March 31, 2015 and 2014 were $548.2 million and $774.5 million, respectively. The outstanding balance of these loans is the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loans, owed at the reporting date, whether or not currently due and whether or not any such amounts have been charged off. Changes in the carrying amount and accretable yield for acquired impaired loans were as follows for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31,
	Acquired Impaired Loans	2015								2014
	(In thousands)	Accretable Yield				Carrying Amount of Loans				Accretable Yield				Carrying Amount of Loans
	Balance at beginning of period	$	119,450			$	423,209			$	136,646			$	601,000
	Accretion	(11,218		)		11,218				(11,741		)		11,741
	Net reclassifications from nonaccretable to accretable	12,995				—				19,514				—
	Payments received, net	—				(46,114		)		—				(55,542		)
	Disposals	(2,471		)		—				(2,135		)		—
	Balance at end of period	$	118,756			$	388,313			$	142,284			$	557,199
	Cash flows expected to be collected on acquired impaired loans are estimated quarterly by incorporating several key assumptions similar to the initial estimate of fair value. These key assumptions include probability of default, and the amount of actual prepayments after the acquisition date. Prepayments affect the estimated life of the 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.
	Improved cash flow expectations for loans or pools that were impaired in prior periods are recorded first as a reversal of previously recorded impairment and then as an increase in prospective yield when all previously recorded impairment has been recaptured. Decreases in expected cash flows are recognized as an impairment through a provision for loan loss and an increase to the allowance for acquired impaired loans.
	During the quarter ended March 31, 2015, there was an overall improvement in cash flow expectations, which resulted in the reclassification of $13.0 million from the nonaccretable difference to accretable yield. This reclassification results in prospective yield adjustments on these loan pools.
	FDIC Acquired Loans and Related Loss Share Receivable
	FDIC acquired loans include loans purchased in the 2010 FDIC-assisted acquisitions of George Washington and Midwest. George Washington non-single family loss share agreements with the FDIC expired at March 31, 2015 resulting in $5.0 million of loans no longer being covered. As of March 31, 2015, $174.6 million of FDIC acquired loans remained covered by the Midwest non-single family loss share agreement. The Midwest non-single family loss share agreement will expire as of June 30, 2015. As of March 31, 2015, $110.4 million of loans remained covered by single family loss share agreements.
	Changes in the loss share receivable for the three months ended March 31, 2015 and 2014 were as follows:
	Loss Share Receivable	Three Months Ended March 31,
	(In thousands)	2015				2014
Balance at beginning of period	$	22,033			$	61,827
Amortization	(2,187		)		(5,863		)
Increase/(decrease) due to impairment (recapture) on FDIC acquired loans	4,227				4,824
FDIC reimbursement	(4,013		)		(5,087		)
FDIC acquired loans paid in full	(55		)		(953		)
Balance at end of the period (1)	$	20,005			$	54,748
(1) As of March 31, 2015, $6.3 million of the loss share receivable related to non-single family covered loans and $13.8 million related to single family covered loans.
Total outstanding FDIC acquired impaired loans were $404.4 million and $702.4 million as of March 31, 2015 and 2014, respectively. The outstanding balance of these loans is the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loans, owed at the reporting date, whether or not currently due and whether or not any such amounts have been charged off. Changes in the carrying amount and accretable yield for FDIC acquired impaired loans were as follows for the three months ended March 31, 2015 and 2014:
	Three Months Ended March 31,
FDIC Acquired Impaired Loans	2015								2014
(In thousands)	Accretable				Carrying				Accretable				Carrying
	Yield				Amount of				Yield				Amount of
					Loans								Loans
Balance at beginning of period	$	37,511			$	232,452			$	67,282			$	403,692
Accretion	(5,567		)		5,567				(12,616		)		12,616
Net reclassifications between non-accretable and accretable	(56		)		—				6,057				—
Payments received, net	—				(38,794		)		—				(51,820		)
(Disposals)/Additions	(2,021		)		—				2,280				—
Balance at end of period	$	29,867			$	199,225			$	63,003			$	364,488
The cash flows expected to be collected on covered impaired loans are estimated quarterly in a similar manner as described above for acquired impaired loans. During the quarter ended March 31, 2015, the re-estimation process resulted in a net reclassification of $56.0 thousand from accretable yield to nonaccretable difference. This reclassification results in prospective yield adjustments on the loan pools.
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 FDIC acquired impaired loans are considered to be accruing and performing even though collection of contractual payments may be in doubt because income continues to be accreted on the loan pool as long as expected cash flows are reasonably estimable.
When a loan is placed on nonaccrual status, interest deemed uncollectible which had been accrued in prior years is charged against the ALL 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 March 31, 2015
(In thousands)																				≥ 90 Days
Originated Loans	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (1)		Loans
Commercial
C&I	$	525			$	515			$	5,846			$	6,886		$	5,311,011	$	5,317,897	$	498	$	18,838
CRE	4,401				1,177				3,481				9,059			2,123,958		2,133,017		150		9,640
Construction	—				—				—				—			580,978		580,978		—		—
Leases	255				—				—				255			388,618		388,873		—		—
Consumer
Installment	11,294				3,215				4,157				18,666			2,481,622		2,500,288		3,332		3,016
Home Equity Lines	1,480				323				1,395				3,198			1,131,040		1,134,238		622		1,780
Credit Cards	654				301				637				1,592			159,174		160,766		312		523
Residential Mortgages	9,236				2,515				7,402				19,153			620,827		639,980		3,000		12,288
Total	$	27,845			$	8,046			$	22,918			$	58,809		$	12,797,228	$	12,856,037	$	7,914	$	46,085
Acquired Loans																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	66			$	131			$	5,366			$	5,563		$	415,247	$	420,810	$	44	$	700
CRE	4,507				1,380				23,420				29,307			554,765		584,072		252		4,172
Construction	—				—				676				676			5,612		6,288		—		—
Consumer
Installment	4,859				1,322				1,121				7,302			710,391		717,693		521		746
Home Equity Lines	2,850				1,544				1,172				5,566			212,258		217,824		462		639
Residential Mortgages	9,894				590				5,250				15,734			362,458		378,192		425		997
Total	$	22,176			$	4,967			$	37,005			$	64,148		$	2,260,731	$	2,324,879	$	1,704	$	7,254
FDIC Acquired Loans (2)																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	815			$	144			$	4,566			$	5,525		$	37,289	$	42,814	n/a		n/a
CRE	413				5,218				44,023				49,654			78,254		127,908		n/a		n/a
Construction	—				—				6,906				6,906			1,919		8,825		n/a		n/a
Consumer
Installment	—				110				—				110			4,671		4,781		n/a		n/a
Home Equity Lines	2,291				564				3,651				6,506			58,664		65,170		n/a		n/a
Residential Mortgages	5,714				163				3,684				9,561			30,909		40,470		n/a		n/a
Total	$	9,233			$	6,199			$	62,830			$	78,262		$	211,706	$	289,968	n/a		n/a
(1) Installment loans 90 days or more past due and accruing include $2.4 million of loans guaranteed by the U.S. government as of March 31, 2015.
(2) Excludes loss share receivable of $20.0 million as of March 31, 2015.
(3) Acquired and FDIC acquired impaired loans were not classified as nonperforming assets at March 31, 2015 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 FDIC acquired impaired loans.
As of December 31, 2014
(In thousands)																				≥ 90 Days
Originated Loans	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (1)		Loans
Commercial
C&I	$	2,212			$	1,162			$	2,670			$	6,044		$	5,169,157	$	5,175,201	$	1,547	$	6,114
CRE	2,155				1,460				8,864				12,479			2,104,639		2,117,118		1,696		11,033
Construction	—				—				—				—			537,766		537,766		—		—
Leases	—				—				—				—			370,179		370,179		—		—
Consumer
Installment	14,621				3,647				4,716				22,984			2,370,467		2,393,451		3,695		3,268
Home Equity Lines	1,357				587				1,206				3,150			1,107,186		1,110,336		569		1,654
Credit Cards	668				516				860				2,044			162,434		164,478		407		596
Residential Mortgages	12,086				2,744				8,013				22,843			602,440		625,283		4,242		11,952
Total	$	33,099			$	10,116			$	26,329			$	69,544		$	12,424,268	$	12,493,812	$	12,156	$	34,617
Acquired Loans																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	92			$	234			$	4,791			$	5,117		$	444,137	$	449,254	$	—	$	787
CRE	3,479				3,398				23,509				30,386			600,288		630,674		44		4,171
Construction	—				—				685				685			6,286		6,971		—		—
Consumer
Installment	6,204				2,029				1,861				10,094			754,074		764,168		615		1,218
Home Equity Lines	2,819				2,123				2,333				7,275			226,354		233,629		1,519		631
Residential Mortgages	13,062				1,648				7,089				21,799			372,685		394,484		1,293		1,249
Total	$	25,656			$	9,432			$	40,268			$	75,356		$	2,403,824	$	2,479,180	$	3,471	$	8,056
FDIC Acquired Loans (2)																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	58			$	—			$	6,041			$	6,099		$	42,738	$	48,837	n/a		n/a
CRE	234				1,517				47,233				48,984			104,524		153,508		n/a		n/a
Construction	—				—				6,064				6,064			3,198		9,262		n/a		n/a
Consumer
Installment	23				—				34				57			4,817		4,874		n/a		n/a
Home Equity Lines	1,395				870				3,859				6,124			67,241		73,365		n/a		n/a
Residential Mortgages	6,205				91				3,572				9,868			31,408		41,276		n/a		n/a
Total	$	7,915			$	2,478			$	66,803			$	77,196		$	253,926	$	331,122	n/a		n/a
(1) Installment loans 90 days or more past due and accruing include $2.4 million of loans guaranteed by the U.S. government as of December 31, 2014.
(2) Excludes loss share receivable of $22.0 million as of December 31, 2014.
(3) Acquired and covered impaired loans were not classified as nonperforming assets at December 31, 2014 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 March 31, 2014
(In thousands)																				≥ 90 Days
Originated Loans	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (1)		Loans
Commercial
C&I	$	4,088			$	561			$	5,546			$	10,195		$	4,465,961	$	4,476,156	$	2,000	$	6,388
CRE	13,549				3,644				7,999				25,192			2,222,093		2,247,285		804		20,679
Construction	369				—				—				369			359,382		359,751		—		55
Leases	—				—				—				—			257,509		257,509		—		—
Consumer
Installment	9,162				2,659				3,762				15,583			1,819,939		1,835,522		3,286		3,222
Home Equity Lines	1,644				444				902				2,990			943,812		946,802		509		1,653
Credit Cards	783				438				573				1,794			146,123		147,917		262		488
Residential Mortgages	9,632				1,882				8,455				19,969			536,002		555,971		4,999		10,963
Total	$	39,227			$	9,628			$	27,237			$	76,092		$	10,750,821	$	10,826,913	$	11,860	$	43,448
Acquired Loans																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	776			$	720			$	4,224			$	5,720		$	705,912	$	711,632	$	170	$	241
CRE	5,356				3,639				21,995				30,990			806,886		837,876		5		1,259
Construction	—				650				—				650			12,720		13,370		—		—
Consumer
Installment	7,216				2,563				1,619				11,398			931,956		943,354		665		678
Home Equity Lines	3,606				811				3,596				8,013			275,296		283,309		1,078		1,090
Residential Mortgages	11,743				1,822				7,090				20,655			425,719		446,374		31		1,405
Total	$	28,697			$	10,205			$	38,524			$	77,426		$	3,158,489	$	3,235,915	$	1,949	$	4,673
FDIC Acquired Loans (2)																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	1,744			$	—			$	11,867			$	13,611		$	51,641	$	65,252	n/a		n/a
CRE	582				449				97,596				98,627			156,966		255,593		n/a		n/a
Construction	1,008				—				16,337				17,345			3,076		20,421		n/a		n/a
Consumer
Installment	—				—				—				—			5,531		5,531		n/a		n/a
Home Equity Lines	758				538				2,093				3,389			91,439		94,828		n/a		n/a
Residential Mortgages	8,374				435				5,872				14,681			34,731		49,412		n/a		n/a
Total	$	12,466			$	1,422			$	133,765			$	147,653		$	343,384	$	491,037	n/a		n/a
(1) Installment loans 90 days or more past due and accruing include $2.3 million of loans guaranteed by the U.S. government as of March 31, 2014.
(2) Excludes loss share receivable of $54.7 million as of March 31, 2014.
(3) Acquired and covered impaired loans were not classified as nonperforming assets at March 31, 2014 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.
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 March 31, 2015
(In thousands)
Originated Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	59,380			$	667			$	—			$	13,052		$	73,099
Grade 2	191,008				3,368				—				5,782			200,158
Grade 3	1,405,007				339,027				62,821				69,686			1,876,541
Grade 4	3,504,600				1,724,516				516,852				297,790			6,043,758
Grade 5	103,432				29,034				942				1,307			134,715
Grade 6	54,470				36,405				363				1,256			92,494
Grade 7	—				—				—				—			—
Total	$	5,317,897			$	2,133,017			$	580,978			$	388,873		$	8,420,765
Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	1,069			$	—			$	—			$	—		$	1,069
Grade 2	—				—				—				—			—
Grade 3	22,875				24,834				—				—			47,709
Grade 4	359,751				496,213				5,612				—			861,576
Grade 5	15,363				21,487				—				—			36,850
Grade 6	21,752				41,538				676				—			63,966
Grade 7	—				—				—				—			—
Total	$	420,810			$	584,072			$	6,288			$	—		$	1,011,170
FDIC Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	—			$	—			$	—			$	—		$	—
Grade 2	1,040				—				—				—			1,040
Grade 3	—				—				—				—			—
Grade 4	33,352				74,128				579				—			108,059
Grade 5	39				2,134				—				—			2,173
Grade 6	8,383				51,646				8,246				—			68,275
Grade 7	—				—				—				—			—
Total	$	42,814			$	127,908			$	8,825			$	—		$	179,547
As of December 31, 2014
(In thousands)
Originated Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	52,676			$	683			$	678			$	4,451		$	58,488
Grade 2	186,278				3,454				—				14,959			204,691
Grade 3	1,340,100				294,281				46,074				71,908			1,752,363
Grade 4	3,413,446				1,745,470				490,757				277,277			5,926,950
Grade 5	139,083				29,990				257				1,389			170,719
Grade 6	43,618				43,240				—				195			87,053
Grade 7	—				—				—				—			—
Total	$	5,175,201			$	2,117,118			$	537,766			$	370,179		$	8,200,264
Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	1,076			$	—			$	—			$	—		$	1,076
Grade 2	—				—				—				—			—
Grade 3	20,891				24,867				—				—			45,758
Grade 4	376,129				532,447				6,286				—			914,862
Grade 5	23,268				28,382				685				—			52,335
Grade 6	27,890				44,978				—				—			72,868
Grade 7	—				—				—				—			—
Total	$	449,254			$	630,674			$	6,971			$	—		$	1,086,899
FDIC Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	—			$	—			$	—			$	—		$	—
Grade 2	1,347				—				—				—			1,347
Grade 3	—				—				—				—			—
Grade 4	36,406				86,779				823				—			124,008
Grade 5	167				3,401				—				—			3,568
Grade 6	10,917				63,328				8,248				—			82,493
Grade 7	—				—				191				—			191
Total	$	48,837			$	153,508			$	9,262			$	—		$	211,607
As of March 31, 2014
(In thousands)
Originated Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	28,610			$	240			$	299			$	8,452		$	37,601
Grade 2	135,574				3,797				—				3,620			142,991
Grade 3	940,937				329,377				24,731				58,397			1,353,442
Grade 4	3,276,975				1,823,877				332,227				179,795			5,612,874
Grade 5	61,507				39,245				259				6,857			107,868
Grade 6	32,553				50,749				2,235				388			85,925
Grade 7	—				—				—				—			—
Total	$	4,476,156			$	2,247,285			$	359,751			$	257,509		$	7,340,701
Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	700			$	—			$	—			$	—		$	700
Grade 2	—				—				—				—			—
Grade 3	37,829				24,177				—				—			62,006
Grade 4	609,383				696,070				13,370				—			1,318,823
Grade 5	43,721				51,253				—				—			94,974
Grade 6	19,999				66,376				—				—			86,375
Grade 7	—				—				—				—			—
Total	$	711,632			$	837,876			$	13,370			$	—		$	1,562,878
FDIC Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	—			$	—			$	—			$	—		$	—
Grade 2	957				—				—				—			957
Grade 3	—				—				—				—			—
Grade 4	42,228				111,610				653				—			154,491
Grade 5	387				2,883				—				—			3,270
Grade 6	19,864				140,927				19,459				—			180,250
Grade 7	1,816				173				309				—			2,298
Total	$	65,252			$	255,593			$	20,421			$	—		$	341,266

Allowance_for_Loan_Losses_Allo

Allowance for Loan Losses Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Allowance for Credit Losses	Allowance for Loan 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 ALL 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 ALL of originated, acquired and FDIC acquired loan portfolios as well as certain significant accounting policies relevant to each category.
	Allowance for Originated Loan Losses
	Management estimates credit losses based on originated individual loans determined to be impaired and on all other loans grouped based on similar risk characteristics. Management also considers internal and external factors such as economic conditions, loan management practices, portfolio monitoring, and other risks, collectively known as qualitative factors, or Q-factors, to estimate credit losses in the loan portfolio. Q-factors are used to reflect changes in the portfolio's collectability characteristics not captured by historical loss data.
	The Corporation's historical loss component is the most significant of the ALL 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 ALL 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 ALL 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 ALL, by portfolio segment for the three months ended March 31, 2015 and 2014, as well as the corresponding recorded investment in originated loans at the end of the period:
	As of March 31, 2015
	(In thousands)
	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		$	37,375			$	10,492			$	2,202			$	674			$	12,918			$	19,324			$	7,966			$	4,745		$	95,696
	Charge-offs		(510		)		(215		)		—				—				(5,055		)		(911		)		(1,452		)		(424		)	(8,567		)
	Recoveries		341				—				1				4				3,020				613				366				35			4,380
	Provision for loan losses		2,632				(1,464		)		(451		)		(49		)		2,475				407				921				1,565			6,036
	Allowance for originated loan losses, ending balance		$	39,838			$	8,813			$	1,752			$	629			$	13,358			$	19,433			$	7,801			$	5,921		$	97,545
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	10,042			$	317			$	—			$	—			$	1,005			$	254			$	263			$	1,416		$	13,297
		Collectively evaluated for impairment	29,796				8,496				1,752				629				12,353				19,179				7,538				4,505			84,248
	Total ending allowance for originated loan losses balance		$	39,838			$	8,813			$	1,752			$	629			$	13,358			$	19,433			$	7,801			$	5,921		$	97,545
	Originated loans:
		Originated loans individually evaluated for impairment	$	35,792			$	15,000			$	—			$	—			$	26,882			$	7,632			$	815			$	24,822		$	110,943
		Originated loans collectively evaluated for impairment	5,282,105				2,118,017				580,978				388,873				2,473,406				1,126,606				159,951				615,158			12,745,094
	Total ending originated loan balance		$	5,317,897			$	2,133,017			$	580,978			$	388,873			$	2,500,288			$	1,134,238			$	160,766			$	639,980		$	12,856,037
	As of March 31, 2014
	(In thousands)
	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		$	42,981			$	12,265			$	2,810			$	1,081			$	11,935			$	12,900			$	7,740			$	4,772		$	96,484
	Charge-offs		(5,074		)		(79		)		—				—				(4,584		)		(1,409		)		(1,455		)		(559		)	(13,160		)
	Recoveries		997				4				28				—				2,749				904				418				38			5,138
	Provision for loan losses		1,271				1,195				(1,368		)		(54		)		1,504				765				148				193			3,654
	Allowance for originated loan losses, ending balance		$	40,175			$	13,385			$	1,470			$	1,027			$	11,604			$	13,160			$	6,851			$	4,444		$	92,116
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	2,866			$	2,918			$	—			$	—			$	1,006			$	223			$	307			$	1,241		$	8,561
		Collectively evaluated for impairment	37,309				10,467				1,470				1,027				10,598				12,937				6,544				3,203			83,555
	Total ending allowance for originated loan losses balance		$	40,175			$	13,385			$	1,470			$	1,027			$	11,604			$	13,160			$	6,851			$	4,444		$	92,116
	Originated loans:
		Originated loans individually evaluated for impairment	$	7,143			$	31,576			$	404			$	—			$	25,818			$	6,931			$	1,034			$	26,198		$	99,104
		Originated loans collectively evaluated for impairment	4,469,013				2,215,709				359,347				257,509				1,809,704				939,871				146,883				529,773			10,727,809
	Total ending originated loan balance		$	4,476,156			$	2,247,285			$	359,751			$	257,509			$	1,835,522			$	946,802			$	147,917			$	555,971		$	10,826,913
	The following table presents the originated ALL and the recorded investment as of December 31, 2014:
	As of December 31, 2014
		(In thousands)
		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	$	72			$	2,914			$	—			$	—			$	1,178			$	207			$	296			$	1,283		$	5,950
		Collectively evaluated for impairment	37,303				7,578				2,202				674				11,740				19,117				7,670				3,462			89,746
	Total ending allowance for originated loan losses balance		$	37,375			$	10,492			$	2,202			$	674			$	12,918			$	19,324			$	7,966			$	4,745		$	95,696
	Originated loans:
		Loans individually evaluated for impairment	$	11,759			$	23,300			$	—			$	—			$	24,905			$	7,379			$	854			$	25,251		$	93,448
		Loans collectively evaluated for impairment	5,163,442				2,093,818				537,766				370,179				2,368,546				1,102,957				163,624				600,032			12,400,364
	Total ending originated loan balance		$	5,175,201			$	2,117,118			$	537,766			$	370,179			$	2,393,451			$	1,110,336			$	164,478			$	625,283		$	12,493,812
	Allowance for Acquired Loan Losses
	The Citizens' loans were recorded at their fair value as of the Acquisition Date and the prior ALL was eliminated. An ALL for acquired nonimpaired loans is estimated using a methodology similar to that used for originated loans. The allowance determined for each acquired nonimpaired loan is compared to the remaining fair value adjustment for that loan. If the computed allowance is greater, the excess is added to the allowance through a provision for loan losses. If the computed allowance is less, no additional allowance is recognized. As of March 31, 2015, the computed ALL was less than the remaining fair value discount; therefore, no ALL for acquired nonimpaired loans was recorded.
	Charge-offs and actual losses on an acquired nonimpaired loan first reduce any remaining fair value discount for that loan. Once a loan's discount is depleted, charge-offs and actual losses are applied against the acquired ALL. During the three months ended March 31, 2015, provision for loan losses, equal to net charge-offs, of $2.2 million was recorded. Charge-offs on acquired nonimpaired loans were mainly related to consumer loans that were written off in accordance with the Corporation's credit policies based on a predetermined number of days past due.
	The ALL for acquired impaired loans is determined by comparing the present value of the cash flows expected to be collected to the carrying amount for a given pool of loans. Management reforecasts the estimated cash flows expected to be collected on acquired impaired loans on a quarterly basis. If the present value of expected cash flows for a pool is less than its carrying value, impairment is recognized by an increase in the ALL 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 ALL is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool. See Note 3 (Loans) for further information on changes in accretable yield.
	The following table presents activity in the allowance for acquired impaired loan losses for the three months ended March 31, 2015 and 2014:
	Allowance for Acquired Impaired Loan Losses	Three Months Ended March 31,
	(In thousands)	2015				2014
	Balance at beginning of the period	$	7,457			$	741
	Charge-offs	—				—
	Recoveries	—				—
Provision for loan losses	36				2,233
Balance at end of the period	$	7,493			$	2,974
Allowance for FDIC Acquired Loan Losses
The ALL on FDIC acquired nonimpaired loans is estimated similar to acquired loans as described above except any increase to the ALL and provision for loan losses is partially offset by an increase in the loss share receivable for the portion of the losses recoverable under the loss sharing agreements with the FDIC. As of March 31, 2015, the computed ALL was less than the remaining fair value discount, therefore, no ALL for FDIC acquired nonimpaired loans was recorded.
The following table presents activity in the allowance for FDIC acquired impaired loan losses for the three months ended March 31, 2015 and 2014:
Allowance for FDIC acquired Impaired Loan Losses		Three Months Ended March 31,
(In thousands)		2015				2014
Balance at beginning of the period		$	40,496			$	44,027
	Net provision/(recapture) of loan losses before benefit attributable to FDIC loss share agreements	4,225				7,879
	Net (benefit)/recapture attributable to FDIC loss share agreements	(4,227		)		(4,824		)
Net provision/(recapture) for loan losses		(2		)		3,055
Increase (decrease) in loss share receivable		4,227				4,824
Loans charged-off		(3,207		)		(1,936		)
Balance at end of the period		$	41,514			$	49,970
An acquired or FDIC acquired loan may be resolved either through receipt of payment (in full or in part) from the borrower, the sale of the loan to a third party, or foreclosure of the collateral. In the period of resolution of a nonimpaired loan, any remaining unamortized fair value adjustment is recognized as interest income. In the period of resolution of an impaired loan accounted for on an individual basis, the difference between the carrying amount of the loan and the proceeds received is recognized as a gain or loss within noninterest income. The majority of impaired loans are accounted for within a pool of loans which results in any difference between the proceeds received and the loan carrying amount being deferred as part of the carrying amount of the pool. The accretable amount of the pool remains unaffected from the resolution until the subsequent quarterly cash flow re-estimation. Favorable results from removal of the resolved loan from the pool increase the future accretable yield of the pool, while unfavorable results are recorded as impairment in the quarter of the cash flow re-estimation. Acquired or FDIC acquired impaired loans subject to modification are not removed from a pool even if those loans would otherwise be deemed TDRs as the pool, and not the individual loan, represents the unit of account.
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.
Interest income recognized on impaired loans was $118.0 thousand for the three months ended March 31, 2015, compared to $103.0 thousand for the three months ended March 31, 2014. Interest income which would have been earned in accordance with the original terms was $0.9 million for the three months ended March 31, 2015, compared to $0.8 million for the three months ended March 31, 2014.
Loan impairment is measured based on either the present value of expected future cash flows discounted at the loan's effective interest rate, at the observable market price of the loan, or the fair value of the collateral for certain collateral dependent loans. Impaired loans include all nonaccrual commercial, agricultural, construction, and commercial real estate loans, and loans modified as a TDR, regardless of nonperforming status. Acquired and FDIC acquired impaired loans are not considered or reported as impaired loans. Nonimpaired acquired loans that are subsequently placed on nonaccrual status are reported as impaired loans and included in the Troubled Debt Restructurings section below. Acquired loans restructured after acquisition are not considered or reported as TDRs if the loans evidenced credit deterioration as of the date of acquisition and are accounted for in pools.
The following tables provide further detail on impaired loans individually evaluated for impairment and the associated ALL. Certain impaired loans do not have a related ALL as the valuation of these impaired loans exceeded the recorded investment.
As of March 31, 2015
Originated Loans						Unpaid								Average
		Recorded				Principal				Related				Recorded
(In thousands)		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	28,513			$	35,307			$	—			$	25,006
	CRE	9,343				15,478				—				9,634
	Construction	—				—				—				—
Consumer
	Installment	1,846				2,428				—				1,881
	Home equity line	977				1,222				—				987
	Credit card	21				21				—				23
	Residential mortgages	12,424				15,125				—				12,488
Subtotal		53,124				69,581				—				50,019
Impaired loans with a related allowance
Commercial
	C&I	7,279				7,350				10,042				5,984
	CRE	5,657				5,664				317				5,668
	Construction	—				—				—				—
Consumer
	Installment	25,036				25,100				1,005				24,181
	Home equity line	6,655				6,655				254				6,715
	Credit card	794				794				263				823
	Residential mortgages	12,398				12,487				1,416				12,414
Subtotal		57,819				58,050				13,297				55,785
	Total impaired loans	$	110,943			$	127,631			$	13,297			$	105,804
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
As of December 31, 2014
Originated Loans						Unpaid								Average
		Recorded				Principal				Related				Recorded
(In thousands)		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	11,451			$	18,207			$	—			$	14,193
	CRE	16,874				22,696				—				18,027
	Construction	—				—				—				—
Consumer
	Installment	4,460				4,584				—				4,272
	Home equity line	1,723				1,754				—				1,792
	Credit card	16				16				—				32
	Residential mortgages	12,204				15,119				—				12,425
Subtotal		46,728				62,376				—				50,741
Impaired loans with a related allowance
Commercial
	C&I	308				344				72				326
	CRE	6,426				6,440				2,914				4,497
	Construction	—				—				—				—
Consumer
	Installment	20,445				21,024				1,178				19,513
	Home equity line	5,656				5,875				207				5,944
	Credit card	838				838				296				966
	Residential mortgages	13,047				13,158				1,283				13,121
Subtotal		46,720				47,679				5,950				44,367
	Total impaired loans	$	93,448			$	110,055			$	5,950			$	95,108
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
As of March 31, 2014
Originated Loans						Unpaid								Average
		Recorded				Principal				Related				Recorded
(In thousands)		Investment				Balance				Allowance				Investment
Impaired loans with no related allowance
Commercial
	C&I	$	2,776			$	5,078			$	—			$	4,690
	CRE	21,777				20,050				—				20,196
	Construction	404				2,777				—				2,943
Consumer
	Installment	2,498				3,502				—				2,579
	Home equity line	997				1,309				—				1,004
	Credit card	42				42				—				50
	Residential mortgages	12,137				14,845				—				12,201
Subtotal		40,631				47,603				—				43,663
Impaired loans with a related allowance
Commercial
	C&I	4,367				9,022				2,866				7,406
	CRE	9,799				9,878				2,918				9,864
	Construction	—				—				—				—
Consumer
	Installment	23,320				23,409				1,006				23,548
	Home equity line	5,934				5,934				223				5,891
	Credit card	992				992				307				1,025
	Residential mortgages	14,061				14,161				1,241				14,067
Subtotal		58,473				63,396				8,561				61,801
	Total impaired loans	$	99,104			$	110,999			$	8,561			$	105,464
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
Troubled Debt Restructurings
In certain circumstances, the Corporation may modify the terms of a loan to maximize the collection of amounts due when a borrower is experiencing financial difficulties or is expected to experience difficulties in the near term. In most cases the modification is either a concessionary reduction in interest rate, extension of the maturity date or modification of the adjustable rate provisions of the loan that would otherwise not be considered; however, forgiveness of principal is rarely granted. Concessionary modifications are classified as TDRs unless the modification is short-term, typically less than 90 days. TDRs accrue interest if the borrower complies with the revised terms and conditions and has demonstrated repayment performance at a level commensurate with the modified terms for a minimum of six consecutive payment cycles after the restructuring date. Acquired loans restructured after acquisition are not considered TDRs if the loans evidenced credit deterioration as of the Acquisition Date and are accounted for in pools.
The substantial majority of the Corporation's residential mortgage TDRs involve reducing the client's loan payment through an interest rate reduction for a set period of time based on the borrower's ability to service the modified loan payment. Modifications of mortgages retained in portfolio are handled using proprietary modification guidelines, or the FDIC's Modification Program for residential first mortgages covered by loss share agreements (agreements between the Bank and the FDIC that afford the Bank significant protection against future losses). The Corporation participates in the U.S. Treasury's Home Affordable Modification Program for originated mortgages sold to and serviced for FNMA and FHLMC.
Commercial and industrial loans modified in a TDR often involve temporary interest-only payments, term extensions and converting revolving credit lines to term loans. Additional collateral, a co-borrower, or a guarantor is often requested. Commercial real estate and construction loans modified in a TDR often involve reducing the interest rate for the remaining term of the loan, extending the maturity date at an interest rate lower than the current market rate for new debt with similar risk, or substituting or adding a new borrower or guarantor. Construction loans modified in a TDR may also involve extending the interest-only payment period. The Corporation has modified certain loans according to provisions in loss share agreements. Losses associated with modifications on these loans, including the economic impact of interest rate reductions, are generally eligible for reimbursement under the loss share agreements.
The following tables provide the number of loans modified in a TDR and the recorded investment and unpaid principal balance by loan portfolio as of March 31, 2015, December 31, 2014, and March 31, 2014.
			As of March 31, 2015
(Dollars in thousands)			Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I	47			$	16,923			$	23,666
		CRE	64			12,076				17,325
		Construction	31			—				—
		Total originated commercial	142			28,999				40,991
	Consumer
		Installment	1,186			26,882				27,528
		Home equity lines	276			7,632				7,877
		Credit card	230			815				815
		Residential mortgages	316			24,822				27,612
		Total originated consumer	2,008			60,151				63,832
Total originated loans			2,150			$	89,150			$	104,823
Acquired loans
	Commercial
		C&I	1			$	2			$	3
		CRE	3			2,453				2,635
		Total acquired commercial	4			2,455				2,638
	Consumer
		Installment	51			1,195				1,281
		Home equity lines	162			7,310				7,370
		Residential mortgages	30			2,186				2,403
		Total acquired consumer	243			10,691				11,054
Total acquired loans			247			$	13,146			$	13,692
FDIC acquired loans
	Commercial
		C&I	8			$	—			$	1,355
		CRE	24			23,895				39,596
		Construction	9			346				9,552
		Total FDIC acquired commercial	41			24,241				50,503
	Consumer
		Home equity lines	70			8,909				8,914
		Residential mortgages	1			185				185
		Total FDIC acquired consumer	71			9,094				9,099
Total FDIC acquired loans			112			$	33,335			$	59,602
Total loans
	Commercial
		C&I	56			$	16,925			$	25,024
		CRE	91			38,424				59,556
		Construction	40			346				9,552
		Total commercial	187			55,695				94,132
	Consumer
		Installment	1,237			28,077				28,809
		Home equity lines	508			23,851				24,161
		Credit card	230			815				815
		Residential mortgages	347			27,193				30,200
		Total consumer	2,322			79,936				83,985
Total loans			2,509			$	135,631			$	178,117
Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.
			As of December 31, 2014
(Dollars in thousands)			Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I	41			$	7,123			$	13,887
		CRE	67			17,607				22,645
		Construction	31			—				—
		Total originated commercial	139			24,730				36,532
	Consumer
		Installment	1,205			24,905				25,608
		Home equity lines	270			7,379				7,629
		Credit card	238			854				854
		Residential mortgages	315			25,251				28,277
		Total originated consumer	2,028			58,389				62,368
Total originated loans			2,167			$	83,119			$	98,900
Acquired loans
	Commercial
		C&I	2			18				19
		CRE	3			2,542				2,595
		Total acquired commercial	5			2,560				2,614
	Consumer
		Installment	40			975				1,054
		Home equity lines	145			6,932				6,983
		Residential mortgages	26			1,633				1,823
		Total acquired consumer	211			9,540				9,860
Total acquired loans			216			$	12,100			$	12,474
FDIC acquired loans
	Commercial
		C&I	8			$	177			$	1,589
		CRE	24			25,499				42,226
		Construction	9			339				9,552
		Total FDIC acquired commercial	41			26,015				53,367
	Consumer
		Home equity lines	68			8,890				8,901
		Residential Mortgages	2			334				334
		Total FDIC acquired consumer	70			9,224				9,235
Total FDIC acquired loans			111			$	35,239			$	62,602
Total loans
	Commercial
		C&I	51			$	7,318			$	15,495
		CRE	94			45,648				67,466
		Construction	40			339				9,552
		Total commercial	185			53,305				92,513
	Consumer
		Installment	1,245			25,880				26,662
		Home equity lines	483			23,201				23,513
		Credit card	238			854				854
		Residential mortgages	343			27,218				30,434
		Total consumer	2,309			77,153				81,463
Total loans			2,494			$	130,458			$	173,976
Note 1: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
			As of March 31, 2014
(Dollars in thousands)			Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I	40			$	5,588			$	12,546
		CRE	57			16,432				17,079
		Construction	32			2,769				2,777
		Total originated commercial	129			24,789				32,402
	Consumer
		Installment	1,434			25,818				26,911
		Home equity lines	244			6,931				7,243
		Credit card	278			1,034				1,034
		Residential mortgages	320			26,199				29,006
		Total originated consumer	2,276			59,982				64,194
Total originated loans			2,405			$	84,771			$	96,596
Acquired loans
	Commercial
		C&I	1			5				5
		CRE	1			1,695				1,687
		Total acquired commercial	2			1,700				1,692
	Consumer
		Installment	23			797				828
		Home equity lines	40			1,926				1,953
		Residential mortgages	11			758				864
		Total acquired consumer	74			3,481				3,645
Total acquired loans			76			$	5,181			$	5,337
FDIC acquired loans
	Commercial
		C&I	4			$	677			$	2,232
		CRE	25			39,939				56,485
		Construction	10			2,560				21,340
		Total FDIC acquired commercial	39			43,176				80,057
	Consumer
		Home equity lines	52			6,269				6,269
		Residential mortgages	2			339				339
		Total FDIC acquired consumer	54			6,608				6,608
Total FDIC acquired loans			93			$	49,784			$	86,665
Total loans
	Commercial
		C&I	45			$	6,270			$	14,783
		CRE	83			58,066				75,251
		Construction	42			5,329				24,117
		Total commercial	170			69,665				114,151
	Consumer
		Installment	1,457			26,615				27,739
		Home equity lines	336			15,126				15,465
		Credit card	278			1,034				1,034
		Residential mortgages	333			27,296				30,209
		Total consumer	2,404			70,071				74,447
Total loans			2,574			$	139,736			$	188,598
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 March 31, 2015 and 2014 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 March 31, 2015 and 2014 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 March 31, 2015 and 2014 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 March 31, 2015, December 31, 2014, and March 31, 2014, the Corporation had $6.1 million, $0.2 million, and $0.4 million, respectively, 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 March 31, 2015, December 31, 2014, and March 31, 2014, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
As of March 31, 2015
	Accruing TDRs												Nonaccruing TDRs												Total				Total
(In thousands)	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	16,558			$	—			$	16,558			$	—			$	365			$	365			$	16,923			$	124
CRE	6,031				1,493				7,524				3,724				828				4,552				12,076				71
Construction	—				—				—				—				—				—				—				—
Total originated commercial	22,589				1,493				24,082				3,724				1,193				4,917				28,999				195
Consumer
Installment	24,701				409				25,110				1,528				244				1,772				26,882				1,005
Home equity lines	6,680				113				6,793				811				28				839				7,632				254
Credit card	721				77				798				—				17				17				815				263
Residential mortgages	14,299				2,286				16,585				5,020				3,217				8,237				24,822				1,416
Total originated consumer	46,401				2,885				49,286				7,359				3,506				10,865				60,151				2,938
Total originated TDRs	$	68,990			$	4,378			$	73,368			$	11,083			$	4,699			$	15,782			$	89,150			$	3,133
Acquired loans
Commercial
C&I	—				—				—				2				—				2				2				2
CRE	—				—				—				954				1,499				2,453				2,453				135
Total acquired commercial	—				—				—				956				1,499				2,455				2,455				137
Consumer
Installment	1,139				33				1,172				23				—				23				1,195				48
Home equity lines	6,610				564				7,174				136				—				136				7,310				—
Residential mortgages	1,335				—				1,335				616				235				851				2,186				—
Total acquired consumer	9,084				597				9,681				775				235				1,010				10,691				48
Total acquired TDRs	$	9,084			$	597			$	9,681			$	1,731			$	1,734			$	3,465			$	13,146			$	185
FDIC acquired loans
Commercial
C&I	$	—			$	—			$	—			$	—			$	—			$	—			$	—			$	—
CRE	—				23,895				23,895				—				—				—				23,895				2,026
Construction	—				346				346				—				—				—				346				293
Total FDIC acquired commercial	—				24,241				24,241				—				—				—				24,241				2,319
Consumer
Home equity lines	7,703				939				8,642				267				—				267				8,909				24
Residential mortgages	185				—				185				—				—				—				185				—
Total FDIC acquired consumer	7,888				939				8,827				267				—				267				9,094				24
Total FDIC acquired TDRs	$	7,888			$	25,180			$	33,068			$	267			$	—			$	267			$	33,335			$	2,343
Total loans
Commercial
C&I	$	16,558			$	—			$	16,558			$	2			$	365			$	367			$	16,925			$	126
CRE	6,031				25,388				31,419				4,678				2,327				7,005				38,424				2,232
Construction	—				346				346				—				—				—				346				293
Total commercial	22,589				25,734				48,323				4,680				2,692				7,372				55,695				2,651
Consumer
Installment	25,840				442				26,282				1,551				244				1,795				28,077				1,053
Home equity lines	20,993				1,616				22,609				1,214				28				1,242				23,851				278
Credit card	721				77				798				—				17				17				815				263
Residential mortgages	15,819				2,286				18,105				5,636				3,452				9,088				27,193				1,416
Total consumer	63,373				4,421				67,794				8,401				3,741				12,142				79,936				3,010
Total TDRs	$	85,962			$	30,155			$	116,117			$	13,081			$	6,433			$	19,514			$	135,631			$	5,661
As of December 31, 2014
	Accruing TDRs												Nonaccruing TDRs												Total				Total
(In thousands)	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	6,740			$	—			$	6,740			$	—			$	383			$	383			$	7,123			$	72
CRE	12,885				952				13,837				394				3,376				3,770				17,607				159
Construction	—				—				—				—				—				—				—				—
Total originated commercial	19,625				952				20,577				394				3,759				4,153				24,730				231
Consumer
Installment	22,254				726				22,980				1,663				262				1,925				24,905				1,178
Home equity lines	6,239				269				6,508				871				—				871				7,379				207
Credit card	775				60				835				15				4				19				854				296
Residential mortgages	13,440				3,538				16,978				5,006				3,267				8,273				25,251				1,283
Total originated consumer	42,708				4,593				47,301				7,555				3,533				11,088				58,389				2,964
Total originated TDRs	$	62,333			$	5,545			$	67,878			$	7,949			$	7,292			$	15,241			$	83,119			$	3,195
Acquired loans
Commercial
C&I	$	15			$	—			$	15			$	3			$	—			$	3			$	18			$	18
CRE	—				—				—				978				1,564				2,542				2,542				134
Total acquired commercial	15				—				15				981				1,564				2,545				2,560				152
Consumer
Installment	841				87				928				24				23				47				975				65
Home equity lines	6,186				607				6,793				139				—				139				6,932				9
Residential mortgages	868				—				868				470				295				765				1,633				2
Total acquired consumer	7,895				694				8,589				633				318				951				9,540				76
Total acquired TDRs	$	7,910			$	694			$	8,604			$	1,614			$	1,882			$	3,496			$	12,100			$	228
FDIC acquired loans
Commercial
C&I	$	—			$	177			$	177			$	—			$	—			$	—			$	177			$	—
CRE	5,123				20,376				25,499				—				—				—				25,499				2,879
Construction	339				—				339				—				—				—				339				295
Total FDIC acquired commercial	5,462				20,553				26,015				—				—				—				26,015				3,174
Consumer
Home equity lines	8,561				—				8,561				329				—				329				8,890				27
Residential mortgages	334				—				334				—				—				—				334				21
Total FDIC acquired consumer	8,895				—				8,895				329				—				329				9,224				48
Total FDIC acquired TDRs	$	14,357			$	20,553			$	34,910			$	329			$	—			$	329			$	35,239			$	3,222
Commercial
C&I	$	6,755			$	177			$	6,932			$	3			$	383			$	386			$	7,318			$	90
CRE	18,008				21,328				39,336				1,372				4,940				6,312				45,648				3,172
Construction	339				—				339				—				—				—				339				295
Total commercial	25,102				21,505				46,607				1,375				5,323				6,698				53,305				3,557
Consumer
Installment	23,095				813				23,908				1,687				285				1,972				25,880				1,243
Home equity lines	20,986				876				21,862				1,339				—				1,339				23,201				243
Credit card	775				60				835				15				4				19				854				296
Residential mortgages	14,642				3,538				18,180				5,476				3,562				9,038				27,218				1,306
Total consumer	59,498				5,287				64,785				8,517				3,851				12,368				77,153				3,088
Total TDRs	$	84,600			$	26,792			$	111,392			$	9,892			$	9,174			$	19,066			$	130,458			$	6,645
As of March 31, 2014
	Accruing TDRs												Nonaccruing TDRs												Total				Total
(In thousands)	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	1,779			$	—			$	1,779			$	541			$	3,268			$	3,809			$	5,588			$	2,265
CRE	9,254				1,884				11,138				2,124				3,170				5,294				16,432				37
Construction	2,363				350				2,713				56				—				56				2,769				—
Total originated commercial	13,396				2,234				15,630				2,721				6,438				9,159				24,789				2,302
Consumer
Installment	22,757				480				23,237				2,352				229				2,581				25,818				1,006
Home equity lines	5,571				150				5,721				1,210				—				1,210				6,931				223
Credit card	930				95				1,025				—				9				9				1,034				307
Residential mortgages	14,749				2,876				17,625				4,968				3,606				8,574				26,199				1,241
Total originated consumer	44,007				3,601				47,608				8,530				3,844				12,374				59,982				2,777
Total originated TDRs	$	57,403			$	5,835			$	63,238			$	11,251			$	10,282			$	21,533			$	84,771			$	5,079
Acquired loans
Commercial
C&I	$	—			$	—			$	—			$	5			$	—			$	5			$	5			$	—
CRE	1,695				—				1,695				—				—				—				1,695				—
Total acquired commercial	1,695				—				1,695				5				—				5				1,700				—
Consumer
Installment	707				77				784				—				13				13				797				—
Home equity lines	1,322				494				1,816				110				—				110				1,926				—
Residential mortgages	758				—				758				—				—				—				758				—
Total acquired consumer	2,787				571				3,358				110				13				123				3,481				—
Total acquired TDRs	$	4,482			$	571			$	5,053			$	115			$	13			$	128			$	5,181			$	—
FDIC acquired loans
Commercial
C&I	$	300			$	377			$	677			$	—			$	—			$	—			$	677			$	12
CRE	5,035				34,904				39,939				—				—				—				39,939				3,915
Construction	682				1,878				2,560				—				—				—				2,560				68
Total FDIC acquired commercial	6,017				37,159				43,176				—				—				—				43,176				3,995
Consumer
Home equity lines	5,793				140				5,933				336				—				336				6,269				—
Residential mortgages	339				—				339				—				—				—				339				—
Total FDIC acquired consumer	6,132				140				6,272				336				—				336				6,608				—
Total FDIC acquired TDRs	$	12,149			$	37,299			$	49,448			$	336			$	—			$	336			$	49,784			$	3,995
Total loans
Commercial
C&I	$	2,079			$	377			$	2,456			$	546			$	3,268			$	3,814			$	6,270			$	2,277
CRE	15,984				36,788				52,772				2,124				3,170				5,294				58,066				3,952
Construction	3,045				2,228				5,273				56				—				56				5,329				68
Total commercial	21,108				39,393				60,501				2,726				6,438				9,164				69,665				6,297
Consumer
Installment	23,464				557				24,021				2,352				242				2,594				26,615				1,006
Home equity lines	12,686				784				13,470				1,656				—				1,656				15,126				223
Credit card	930				95				1,025				—				9				9				1,034				307
Residential mortgages	15,846				2,876				18,722				4,968				3,606				8,574				27,296				1,241
Total consumer	52,926				4,312				57,238				8,976				3,857				12,833				70,071				2,777
Total TDRs	$	74,034			$	43,705			$	117,739			$	11,702			$	10,295			$	21,997			$	139,736			$	9,074
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 ALL may be increased, adjustments may be made in the allocation of the ALL, or partial charge-offs may be taken to further write-down the carrying value of the loan.
On an ongoing basis, the Corporation monitors the performance of modified loans to their restructured terms.  In the event of a subsequent default, the ALL continues to be reassessed on the basis of an individual evaluation of the loan.
The following tables provide the number of loans modified in a TDR within the previous 12 months that subsequently defaulted during the three months ended March 31, 2015 and March 31, 2014, as well as the amount defaulted in these restructured loans.
	As of March 31, 2015
(Dollars in thousands)	Number of Loans			Amount Defaulted
Originated loans
Commercial
C&I	—			$	—
CRE	—			—
Construction	—			—
Total originated commercial	—			—
Consumer
Installment	2			—
Home equity lines	—			—
Credit card	2			17
Residential mortgages	—			—
Total originated consumer	4			$	17
FDIC acquired loans
Commercial
C&I	1			$	427
CRE	—			—
Construction	—			—
Total FDIC acquired commercial	1			$	427
Acquired loans
Commercial
C&I	1			$	55
CRE	—			—
Construction	—			—
Total acquired commercial	1			$	55
Total loans
Commercial
C&I	2			$	482
CRE	—			—
Construction	—			—
Total commercial	2			482
Consumer
Installment	2			—
Home equity lines	—			—
Credit card	2			17
Residential mortgages	—			—
Total consumer	4			17
Total	6			$	499
	As of March 31, 2014
(Dollars in thousands)	Number of Loans			Recorded Investment
Originated loans
Commercial
C&I	1			$	1,557
CRE	1			376
Construction	—			—
Total originated commercial	2			1,933
Consumer
Installment	—			—
Home equity lines	—			—
Credit card	3			4,839
Residential mortgages	—			—
Total originated consumer	3			$	4,839
FDIC acquired loans
Commercial
C&I	—			$	—
CRE	—			—
Construction	—			—
Total FDIC acquired commercial	—			$	—
Total loans
Commercial
C&I	1			$	1,557
CRE	1			376
Construction	—			—
Total commercial	2			1,933
Consumer
Installment	—			—
Home equity lines	—			—
Credit card	3			4,839
Residential mortgages	—			—
Total consumer	3			4,839
Total	5			$	6,772

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	Goodwill
	Goodwill totaled $741.7 million as of March 31, 2015, December 31, 2014, and March 31, 2014. 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, 2014 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment exists.
	Other Intangible Assets
	The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, lease intangibles and trust relationship intangibles. The following tables show the gross carrying amount, accumulated amortization, and net carrying amount of these intangible assets.
		March 31, 2015
		Gross Carrying		Accumulated			Net Carrying
	(In thousands)	Amount		Amortization			Amount
	Core deposit intangibles (1)	$	82,323	$	(22,073	)	$	60,250
	Lease intangible	238		(185		)	53
	Trust Relationships (2)	14,000		(5,881		)	8,119
		$	96,561	(28,139		)	$	68,422
		December 31, 2014
		Gross Carrying		Accumulated			Net Carrying
	(In thousands)	Amount		Amortization			Amount
	Core deposit intangibles (1)	$	82,323	$	(19,996	)	$	62,327
	Lease intangible	238		(176		)	62
	Trust Relationships (2)	14,000		(5,369		)	8,631
		$	96,561	$	(25,541	)	$	71,020
		March 31, 2014
		Gross Carrying		Accumulated			Net Carrying
	(In thousands)	Amount		Amortization			Amount
	Core deposit intangibles (1)	$	87,533	$	(18,352	)	$	69,181
	Lease intangible	238		(149		)	89
	Trust relationships (2)	14,000		(3,451		)	10,549
		$	101,771	$	(21,952	)	$	79,819
	(1) Core deposit intangibles are amortized on an accelerated basis over their estimated useful lives ,which range from 10-15 years.
	(2) Trust relationship intangibles are amortized on an accelerated basis on their estimated useful lives of 12 years.
	Amortization expense for intangible assets was $2.6 million in the three months ended March 31, 2015, compared to $2.9 million in the three months ended March 31, 2014. Estimated amortization expense for each of the next five years is as follows: remainder of 2015 - $7.8 million; 2016 - $9.2 million; 2017 - $8.2 million; 2018 - $7.3 million; and 2019 - $6.5 million.

Shareholders_Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Stockholders' Equity Note Disclosure	Shareholders' Equity
	Common Stock Warrant
	The Corporation has an outstanding warrant previously issued by Citizen’s to the U.S. Treasury to initially purchase 2,408,203 shares of FirstMerit Common Stock. Due to a dividend protection clause, the strike price is reduced by an amount equivalent to the dividend as a percentage of the closing market price on the day prior to the ex-dividend date. The adjusted shares are calculated by dividing the original proceeds by the adjusted strike price. At March 31, 2015, the adjusted strike price is $17.50 with a corresponding adjusted number of 2,571,998 shares issuable upon exercise of the warrant issued to the U.S. Treasury and currently available for purchase.
	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, of which 100,000 shares were issued. The Preferred Stock pays cash dividends quarterly in arrears on the 4th day of February, May, August, and November.
	Earnings Per Share
	Basic net income per common share is calculated using the two-class method to determine income attributable to common shareholders. Net income attributable to Common Stock is then divided by the weighted-average number of Common Stock outstanding during the period.
	Diluted net income per common share is calculated under the more dilutive of either the treasury method or two-class method. Adjustments to the weighted-average number of shares of Common Stock outstanding are made only when such adjustments will dilute earnings per common share. Net income attributable to Common Stock is then divided by the weighted-average number of Common Stock and Common Stock equivalents outstanding during the period.
	The reconciliation between basic and diluted EPS using the two-class method and treasury stock method is presented as follows:
		Three Months Ended March 31,
	(Dollars in thousands, except per share amounts)	2015		2014
	Basic EPS:
	Net income	$	57,139	$	53,455
	Less:
	Cash dividends on 5.875% non-cumulative perpetual series A, Preferred Stock	1,469		1,469
	Income allocated to participating securities	407		380
	Net income attributable to common shareholders	$	55,263	$	51,606
	Weighted average Common Stock outstanding used in basic EPS	165,411		165,060
	Basic net income per common share	$	0.33	$	0.31
	Diluted EPS:
	Income used in diluted earnings per common share calculation	$	55,263	$	51,606
	Weighted average Common Stock outstanding used in basic EPS	165,411		165,060
	Add: Common Stock equivalents:
	Warrant and stock plans	592		944
	Weighted average Common and Common Stock equivalent shares outstanding	166,003		166,004
	Diluted net income per common share	$	0.33	$	0.31
	Common Stock equivalents consist of employee stock award plans and the Common Stock warrant. These Common Stock equivalents do not enter into the calculation of diluted EPS if the impact would be anti-dilutive, that is, increase EPS or reduce a loss per share. Antidilutive potential Common Stock for the three months ended March 31, 2015 and 2014 totaled 0.8 million and 1.0 million, respectively.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
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, eliminating 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 2014 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. In the first quarter of 2014, Management changed the estimate regarding the funds transfer pricing crediting rate provided on non-maturity deposits. Assets and liabilities are match-funded based on their maturity, prepayment and/or repricing characteristics. As a result, the three primary lines of business are generally insulated from changes in interest rates. Changes in net interest income due to changes in rates are reported in Other by the treasury group. Capital has been allocated on an economic risk basis. Loans and lines of credit have been allocated capital based upon their respective credit risk. Asset management holdings in the Wealth segment have been allocated capital based upon their respective market risk related to assets under management. Normal business operating risk has been allocated to each line of business by the level of noninterest expense. Mismatch between asset and liability cash flow as well as interest rate risk for mortgage servicing rights and the origination business franchise value have been allocated capital based upon their respective asset/liability management risk. The provision for loan loss is allocated based upon the actual net charge-offs of each respective line of business, adjusted for loan growth and changes in risk profile. Noninterest income and expenses directly attributable to a line of business are assigned to that line of business. Expenses for centrally provided services are allocated to the business line by various activity based cost formulas.
	Substantially all of the Corporation’s business is conducted in the United States of America. The following tables present a summary of financial results as of and for the three months ended March 31, 2015 and March 31, 2014:
													FirstMerit
	(In thousands)	Commercial			Retail		Wealth			Other			Consolidated
	March 31, 2015	QTD			QTD		QTD			QTD			QTD
	OPERATIONS:
	Net interest income/(loss)	$	99,844		$	91,095	$	5,353		$	(10,669	)	$	185,623
	Provision (recapture) for loan losses	(526		)	7,533		(170		)	1,411			8,248
	Noninterest income	22,490			21,737		13,976			7,644			65,847
	Noninterest expense	61,653			88,271		13,719			(2,991		)	160,652
	Net income/(loss)	39,785			11,068		3,756			2,530			57,139
	AVERAGES:
	Assets	$	9,454,218		$	5,845,417	$	302,186		$	9,303,273		$	24,905,094
	Loans	9,506,529			5,570,590		292,016			58,046			15,427,181
	Earning assets	9,794,483			5,582,849		292,016			6,431,069			22,100,417
	Deposits	6,886,945			11,124,158		1,240,960			536,862			19,788,925
	Economic capital	848,890			479,188		55,187			1,483,097			2,866,362
													FirstMerit
	(In thousands)	Commercial			Retail		Wealth			Other			Consolidated
	March 31, 2014	QTD			QTD		QTD			QTD			QTD
	OPERATIONS:
	Net interest income/(loss)	$	105,063		$	93,250	$	4,678		$	(9,091	)	$	193,900
	Provision (recapture) for loan losses	5,706			8,339		(45		)	536			14,536
	Noninterest income	21,306			27,035		13,464			5,465			67,270
	Noninterest expense	63,966			96,701		13,518			(4,854		)	169,331
	Net income/(loss)	36,884			9,909		3,035			3,627			53,455
	AVERAGES:
	Assets	$	9,072,390		$	5,449,856	$	241,618		$	9,380,706		$	24,144,570
	Loans	9,061,371			5,084,555		230,429			36,126			14,412,481
	Earning assets	9,308,031			5,101,740		230,429			6,263,663			20,903,863
	Deposits	6,645,640			11,753,015		1,009,811			228,039			19,636,505
	Economic capital	654,922			320,090		57,784			1,700,430			2,733,226

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	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.
	At March 31, 2015, December 31, 2014, and March 31, 2014, 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
		March 31, 2015						December 31, 2014					March 31, 2014					March 31, 2015				December 31, 2014				March 31, 2014
	(In thousands)	Notional/ Contract Amount			Fair Value (1)			Notional/ Contract Amount		Fair Value (1)			Notional/ Contract Amount			Fair Value (1)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)
	Interest rate swaps:
	Commercial Loan Swaps (FRAPS)	$	—		$	—		$	—	$	—		$	5,389		$	1	$	89,591	$	6,063	$	93,313	$	6,683	$	117,543	$	10,392
	Sub Debt Swap	250,000			12,688			250,000		5,256			—			—		—		—		—		—		—		—
	Fair value hedges	$	250,000		$	12,688		$	250,000	$	5,256		$	5,389		$	1	$	89,591	$	6,063	$	93,313	$	6,683	$	117,543	$	10,392
	(1) Included in "Other assets" on the Consolidated Balance Sheets
	(2) Included in "Other liabilities" on the Consolidated Balance Sheets
	Fair Value Hedges. Prior to 2009, the Corporation entered into interest rate swaps with dealer counterparties to convert certain fixed rate loans to variable rate instruments over the terms of the loans (termed by the Corporation as the FRAP Program). These interest rate swaps are designated as fair value hedges and met the criteria to qualify for the short cut method of accounting. Based on this shortcut method of accounting treatment, no ineffectiveness is assumed. The Corporation discontinued originating interest rate swaps under the FRAP Program in February 2008.
	During the fourth quarter of 2014, the Corporation entered into a $250.0 million interest rate swap simultaneously with its long-term debt issuance for interest rate risk management purposes. This interest rate swap effectively modifies the receipt of fixed-rate interest amounts in exchange for floating-rate interest payments over the life of the swap, without an exchange of the underlying principal amount. This interest rate swap was designated as a fair value hedge, and through application of the “short cut method of accounting”, there is an assumption that the hedge is effective in offsetting changes in the fair value of the long-term debt due to changes in the U.S. LIBOR swap rate (the designated benchmark interest rate).
	Derivatives Not Designated in Hedge Relationships
	As of March 31, 2015, December 31, 2014, and March 31, 2014, 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
		March 31, 2015						December 31, 2014					March 31, 2014					March 31, 2015				December 31, 2014				March 31, 2014
	(In thousands)	Notional/ Contract Amount			Fair Value (1)			Notional/ Contract Amount		Fair Value (1)			Notional/ Contract Amount			Fair Value (1)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)
	Interest rate swaps	$	1,718,850		$	59,147		$	1,673,012	$	48,366		$	1,603,125		$	44,672	$	1,718,850	$	59,147	$	1,673,012	$	48,366	$	1,603,125	$	44,672
	Mortgage loan commitments	51,937			388			102,523		1,408			132,614			1,575		—		—		—		—		—		—
	Forward sales contracts	11,758			—			47,657		—			53,404			167		—		68		—		272		—		—
	Credit contracts	—			—			10,001		—			—			—		80,047		—		69,227		—		49,456		—
	Foreign exchange	40,537			350			22,406		167			17,630			52		10,052		169		6,580		118		15,898		42
	Equity swap	—			—			—		—			—			—		30,896		—		75,138		—		61,859		—
	Total	$	1,823,082		$	59,885		$	1,855,599	$	49,941		$	1,806,773		$	46,466	$	1,839,845	$	59,384	$	1,823,957	$	48,756	$	1,730,338	$	44,714
	(1) Included in "Other assets" on the Consolidated Balance Sheets
	(2) Included in "Other liabilities" on the Consolidated Balance Sheets
	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. The Corporation has bought and sold credit protection in the form of participations on interest rate swaps (swap participations). These swap participations, which meet the definition of credit derivatives, were entered into in the ordinary course of business. Credit derivatives, whereby the Corporation has purchased credit protection, entitles the Corporation to receive a payment from the counterparty when the customer fails to make payment on any amounts due to the Corporation. Swap participations whereby the Corporation has purchased credit protection have maturities that range between three to eight years. For swap participations where the Corporation sold credit protection, the Corporation has guaranteed payment in the event that the counterparty experiences a loss on the 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. Credit derivatives whereby the Corporation has sold credit protection have maturities ranging from less than one year to nine years. The Corporation's maximum estimated exposure to sold 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 $5.7 million as of March 31, 2015. The fair values of the written swap participations were not material at March 31, 2015, December 31, 2014, and March 31, 2014.
	Gains and losses recognized in income on non-designated hedging instruments for the three months ended March 31, 2015 and 2014 are as follows:
	Derivatives not		Location of Gain/(Loss)	Amount of Gain / (Loss) Recognized in Income on Derivatives (In thousands)
	designated as hedging		Recognized
	instruments		in Income on	Three Months Ended March 31,
			Derivative	2015			2014
	Mortgage loan commitments		Loan sales and servicing income	$	(1,020	)	$	684
	Forward sales contracts		Loan sales and servicing income	204			(216		)
	Foreign exchange contracts		Other operating income	(877		)	(221		)
	Equity swap		Other operating expense	—			—
	Total			$	(1,693	)	$	247
	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, a derivative clearing organization, 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 with collateral delivery thresholds on all bilateral derivatives. 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.
	The majority of the Corporation's over-the-counter derivative transactions are cleared through a recognized derivative clearing organization ("Clearinghouse"). For cleared derivatives, the Clearinghouse is the Corporation's counterparty. For cleared derivatives, the Clearinghouse is the Corporation's counterparty. The Clearinghouse notifies the clearing agent of the required initial and variation margin and the clearing agent notifies the Corporation of the required initial and variation margin. The requirement that the Corporation post initial and variation margin through the clearing agent, to the Clearinghouse, exposes the Corporation to institutional credit risk if the clearing agent or the Clearinghouse fails to meet its obligations. The use of cleared derivatives is intended to mitigate credit risk exposure because a central counterparty is substituted for individual counterparties and collateral is posted daily through a clearing agent for changes in the value of cleared derivatives.
	Collateral posted against derivative liabilities was $53.6 million, $53.5 million, and $67.7 million as of March 31, 2015, December 31, 2014, and March 31, 2014, 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 in the 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 March 31, 2015, December 31, 2014, and March 31, 2014. 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 March 31, 2015
		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
	(In thousands)									Financial instruments (1)			Collateral (2)
	Derivative Assets
	Interest rate swaps - designated	$	12,688		$	—		$	12,688	$	—		$	—		$	12,688
	Interest rate swaps - non-designated	$	67		$	—		$	67	$	(67	)	$	—		$	—
	Foreign exchange	219			—			219		47			(266		)	—
	Total derivative assets	$	12,974		$	—		$	12,974	$	(20	)	$	(266	)	$	12,688
	Derivative liabilities
	Interest rate swaps - designated	$	6,063		$	—		$	6,063	$	—		$	(6,063	)	$	—
	Interest rate swaps - non-designated	59,080			—			59,080		(67		)	(59,013		)	—
	Foreign exchange	47			—			47		47			(94		)	—
Total derivative liabilities	$	65,190		$	—		$	65,190	$	(20	)	$	(65,170	)	$	—
	As of December 31, 2014
	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
(In thousands)									Financial instruments (1)			Collateral (2)
Derivative assets
Interest rate swaps - designated	5,256			—			5,256		—			—			5,256
Interest rate swaps - non-designated	$	352		$	—		$	352	$	(352	)	$	—		$	—
Foreign exchange	134			—			134		28			(162		)	—
Total derivative assets	$	5,742		$	—		$	5,742	$	(324	)	$	(162	)	$	5,256
Derivative liabilities
Interest rate swaps - designated	$	6,683		$	—		$	6,683	$	—		$	(6,683	)	$	—
Interest rate swaps - non-designated	48,014			—			48,014		(352		)	(47,662		)	—
Foreign exchange	28			—			28		28			(56		)	—
Total derivative liabilities	$	54,725		$	—		$	54,725	$	(324	)	$	(54,401	)	$	—
	As of March 31, 2014
	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
(In thousands)									Financial instruments (1)			Collateral (2)
Derivative assets
Interest rate swaps - non-designated	$	2,811		$	—		$	2,811	$	(2,811	)	$	—		$	—
Foreign exchange	33			—			33		(17		)	(16		)	—
Total derivative assets	$	2,844		$	—		$	2,844	$	(2,828	)	$	(16	)	$	—
Derivative liabilities
Interest rate swaps - designated	$	10,392		$	—		$	10,392	$	—		$	(10,392	)	$	—
Interest rate swaps - non-designated	41,861			—			41,861		(2,811		)	(39,050		)	—
Foreign exchange	17			—			17		(17		)	—			—
Total derivative liabilities	$	52,270		$	—		$	52,270	$	(2,828	)	$	(49,442	)	$	—
(1) 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.
(2) 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 Sheets 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 Sheets unless the Corporation defaults.

Benefit_Plans

Benefit Plans	3 Months Ended
	Mar. 31, 2015
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 March 31,
	(In thousands)	2015			2014
	Service cost	$	207		$	182
	Interest cost	3,517			3,584
	Expected return on assets	(3,902		)	(4,009		)
	Amortization of unrecognized prior service costs	570			634
	Amortization of Actuarial Gain	1,057			708
	Net periodic pension cost	$	1,449		$	1,099
		Postretirement Benefits
		Three Months Ended March 31,
	(In thousands)	2015			2014
	Service cost	$	41		$	16
	Interest cost	144			164
	Amortization of unrecognized prior service costs	(160		)	(117		)
	Amortization of actuarial losses/(gains)	81			59
	Net periodic postretirement cost	$	106		$	122
	For further information on the Corporation's employee benefit plans, refer to Note 14 (Benefit Plans) to the consolidated financial statements in the 2014 Form 10-K.

Fair_Value_Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2015
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 as 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" to the 2014 Form 10-K.
	The following tables present the balance of assets and liabilities measured at fair value on a recurring and nonrecurring basis as of March 31, 2015, December 31, 2014, and March 31, 2014:
				Fair Value by Hierarchy
	(In thousands)	31-Mar-15		Level 1		Level 2		Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	2,869	$	2,869	$	—	$	—
	U.S. treasury notes & bonds	—		—		—		—
	U.S. government agency debentures	2,513		—		2,513		—
	U.S. States and political subdivisions	215,164		—		215,164		—
	Residential mortgage-backed securities:
	U.S. government agencies	947,303		—		947,303		—
	Commercial mortgage-backed securities:
	U.S. government agencies	140,359		—		140,359		—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,892,560		—		1,892,560		—
	Non-agency	6		—		1		5
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	244,059		—		244,059		—
	Corporate debt securities	52,264		—		—		52,264
	Asset-backed securities:
	Collateralized loan obligations	293,962		—		—		293,962
	Total available for sale securities	3,791,059		2,869		3,441,959		346,231
	Residential loans held for sale	3,568		—		3,568		—
	Derivative assets:
	Interest rate swaps - fair value hedges	12,688		—		12,688		—
	Interest rate swaps - nondesignated	59,147		—		59,147		—
	Mortgage loan commitments	388		—		388		—
	Foreign exchange	350		—		350		—
	Total derivative assets	72,573		—		72,573		—
	Total fair value of assets (1)	$	3,867,200	$	2,869	$	3,518,100	$	346,231
	Derivative liabilities:
	Interest rate swaps - fair value hedges	$	6,063	$	—	$	6,063	$	—
	Interest rate swaps - nondesignated	59,147		—		59,147		—
	Forward sales contracts	68		—		68		—
	Foreign exchange	169		—		169		—
	Equity swap	—		—		—		—
	Total derivative liabilities	65,447		—		65,447		—
	True-up liability	13,707		—		—		13,707
	Total fair value of liabilities (1)	$	79,154	$	—	$	65,447	$	13,707
	Nonrecurring fair value measurement
	Mortgage servicing rights (2)	$	20,526	$	—	$	—	$	20,526
	Impaired loans (3)	63,839		—		—		63,839
	Other property (4)	16,956		—		—		16,956
	Other real estate covered by loss share (5)	7,293		—		—		7,293
	Total nonrecurring fair value	$	108,614	$	—	$	—	$	108,614
	(1) There were no transfers between levels 1, 2 or 3 of the fair value hierarchy during the three months ended March 31, 2015.
	(2) MSRs with a recorded investment of $21.5 million were reduced by a specific valuation allowance totaling $1.1 million to a reported carrying value of $20.4 million resulting in recognition of $0.2 million in expense included in loan sales and servicing income in the three months ended March 31, 2015.
(3) Collateral dependent impaired loans with a recorded investment of $75.6 million were reduced by specific valuation allowance allocations totaling $11.8 million to a reported net carrying value of $63.8 million.
(4) Amounts do not include assets held at cost at March 31, 2015. During the three months ended March 31, 2015, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.9 million included in noninterest expense.
(5) Amounts do not include assets held at cost at March 31, 2015. During the three months ended March 31, 2015, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.1 million included in noninterest expense.
			Fair Value by Hierarchy
(In thousands)	31-Dec-14		Level 1		Level 2		Level 3
Recurring fair value measurement
Available-for-sale securities:
Marketable equity securities	$	2,974	$	2,974	$	—	$	—
U.S. government agency debentures	2,482		—		2,482		—
U.S. States and political subdivisions	227,342		—		227,342		—
Residential mortgage-backed securities:
U.S. government agencies	970,998		—		970,998		—
Commercial mortgage-backed securities:
U.S. government agencies	103,403		—		103,403		—
Residential collateralized mortgage-backed securities:
U.S. government agencies	1,676,567		—		1,676,567		—
Non-agency	7		—		1		6
Commercial collateralized mortgage-backed securities:
U.S. government agencies	222,334		—		222,334		—
Corporate debt securities	51,337		—		—		51,337
Asset-backed securities
Collateralized loan obligations	287,844		—		—		287,844
Total available-for-sale securities	3,545,288		2,974		3,203,127		339,187
Residential loans held for sale	13,428		—		13,428		—
Derivative assets:
Interest rate swaps - fair value hedges	5,256		—		5,256		—
Interest rate swaps - nondesignated	48,366		—		48,366		—
Mortgage loan commitments	1,408		—		1,408		—
Forward sale contracts	—		—		—		—
Foreign exchange	167		—		167		—
Total derivative assets	55,197		—		55,197		—
Total fair value of assets (1)	$	3,613,913	$	2,974	$	3,271,752	$	339,187
Derivative liabilities:
Interest rate swaps - fair value hedges	$	6,683	$	—	$	6,683	$	—
Interest rate swaps - nondesignated	48,366		—		48,366		—
Forward sale contracts	272		—		272		—
Foreign exchange	118		—		118		—
Total derivative liabilities	55,439		—		55,439		—
True-up liability	13,294		—		—		13,294
Total fair value of liabilities (1)	$	68,733	$	—	$	55,439	$	13,294
Nonrecurring fair value measurement
Mortgage servicing rights (2)	$	21,228	$	—	$	—	$	21,228
Impaired loans (3)	56,041		—		—		56,041
Other property (4)	12,510		—		—		12,510
Other real estate covered by loss share (5)	3,614		—		—		3,614
Total nonrecurring fair value	$	93,393	$	—	$	—	$	93,393
(1) There were no transfers between levels 1, 2 or 3 of the fair value hierarchy during the year ended December 31, 2014.
(2) MSRs with a recorded investment of $22.0 million were reduced by a specific valuation allowance totaling $1.0 million to a reported carrying value of $21.1 million resulting in a recovery of previously recognized expense of $0.7 million in recoveries included in loans sales and servicing income in the year ended December 31, 2014.
(3) Collateral dependent impaired loans with a recorded investment of $60.3 million were reduced by specific valuation allowance allocations totaling $4.3 million to a reported net carrying value of $56.0 million.
(4) Amounts do not include assets held at cost at December 31, 2014. During the year ended December 31, 2014, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $2.6 million included in noninterest expense.
(5) Amounts do not include assets held at cost at December 31, 2014. During the year ended December 31, 2014, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $1.2 million included in noninterest expense.
			Fair Value by Hierarchy
(In thousands)	31-Mar-14		Level 1		Level 2		Level 3
Recurring fair value measurement
Available-for-sale securities:
Marketable equity securities	$	3,055	$	3,055	$	—	$	—
Non-marketable equity securities	3,281				10		3,271
U.S. States and political subdivisions	250,980		—		250,980		—
Residential mortgage-backed securities:
U.S. government agencies	1,023,994		—		1,023,994		—
Commercial mortgage-backed securities:
U.S. government agencies	85,133		—		85,133		—
Residential collateralized mortgage-backed securities:
U.S. government agencies	1,548,104		—		1,548,104		—
Non-agency	8		—		1		7
Commercial collateralized mortgage-backed securities:
U.S. government agencies	172,469		—		172,469		—
Corporate debt securities	51,588		—		—		51,588
Asset-backed securities:
Collateralized loan obligations	294,559		—		—		294,559
Total available-for-sale securities	3,433,171		3,055		3,080,691		349,425
Residential loans held for sale	7,143		—		7,143		—
Derivative assets:
Interest rate swaps - fair value hedges	1		—		1		—
Interest rate swaps - nondesignated	44,672		—		44,672		—
Mortgage loan commitments	1,575		—		1,575		—
Forward sale contracts	167		—		167		—
Foreign exchange	52		—		52		—
Total derivative assets	46,467		—		46,467		—
Total fair value of assets (1)	$	3,486,781	$	3,055	$	3,134,301	$	349,425
Derivative liabilities:
Interest rate swaps - fair value hedges	10,392		—		10,392		—
Interest rate swaps - nondesignated	44,672		—		44,672		—
Foreign exchange	42		—		42		—
Total derivative liabilities	55,106		—		55,106		—
True-up liability	11,983		—		—		11,983
Total fair value of liabilities (1)	$	67,089	$	—	$	55,106	$	11,983
Nonrecurring fair value measurement
Mortgage servicing rights (2)	$	22,631	$	—	$	—	$	22,631
Impaired loans (3)	58,296		—		—		58,296
Other property (4)	11,568		—		—		11,568
Other real estate covered by loss share (5)	19,708		—		—		19,708
Total nonrecurring fair value	$	112,203	$	—	$	—	$	112,203
(1) There were no transfers between levels 1, 2 and 3 of the fair value hierarchy during the three months ended March 31, 2014.
(2) MSRs with a recorded investment of $22.5 million were reduced by a specific valuation allowance totaling $0.4 million to a reported carrying value of $22.0 million resulting in recovery of a previously recognized expense of $0.1 million in the three months ended March 31, 2014.
(3) Collateral dependent impaired loans with a recorded investment of $65.3 million were reduced by specific valuation allowance allocations totaling $7.0 million to a reported net carrying value of $58.3 million.
(4) Amounts do not include assets held at cost at March 31, 2014. During the three months ended March 31, 2014, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.8 million included in noninterest expense.
(5) Amounts do not include assets held at cost at March 31, 2014. During the three months ended March 31, 2014, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.4 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 March 31, 2015 and 2014, 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 91% 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 CMOs.  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 March 31, 2015, 9% of the available-for-sale portfolio is Level 3, which consists of single issuer trust preferred securities and CLOs.
The single issuer trust preferred securities are measured at unadjusted prices obtained from the independent pricing service. The independent pricing service prices these instruments through a broker quote when sufficient information, such as cash flows or other security structure or market information, is not available to produce an evaluation. Broker-quoted securities are adjusted by the independent pricing service based solely on the receipt of updated quotes from market makers or broker-dealers recognized as market participants. A list of such issues is compiled by the independent pricing service daily. For broker-quoted issues, the independent pricing service applies a zero spread relationship to the bid-side valuation, resulting in the same values for the mean and ask.
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 ALL 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 ALL 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 MSRs at lower of cost or fair value, and, therefore, they are subject to fair value measurements on a nonrecurring basis. Since sales of MSRs 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 MSRs. 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 MSRs within Level 3.
The Corporation utilizes a third-party vendor to perform the modeling to estimate the fair value of its MSRs. 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 11 (Mortgage Servicing Rights and Mortgage Servicing Activity) for further information on MSRs 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 Bank's Board 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 March 31, 2015.
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 3.05% and 3.46% as of March 31, 2015 and 2014, respectively. Increasing or decreasing the discount rate by one percentage point would change the liability by approximately $0.7 million and $0.7 million, respectively, as of March 31, 2015 and March 31, 2014.
In accordance with the loss sharing agreements governing the Midwest acquisition, on July 15, 2020 (the “Midwest True-Up Measurement Date”), the Bank has agreed to pay to the FDIC half of the amount, if positive, calculated as: (1) 20% of the intrinsic loss estimate of the FDIC (approximately $152 million); minus (2) the sum of (A) 25% of the asset premium paid in connection with the Midwest acquisition (approximately $21 million); plus (B) 25% of the cumulative shared-loss payments (as defined below) plus (C) the cumulative servicing amount (as defined below). The fair value of the true-up liability associated with the Midwest acquisition was $8.6 million, $8.5 million, and $7.4 million as of March 31, 2015, December 31, 2014, and March 31, 2014, 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 $5.1 million, $4.8 million, and $4.6 million as of March 31, 2015, December 31, 2014, and March 31, 2014, 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 3 (Loans) and Note 4 (Allowance for Loan 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 months ended March 31, 2015 and 2014 are summarized as follows:
	Three Months Ended March 31,
	2015				2014
(In thousands)	Available-for-sale securities		True-up liability		Available-for-sale securities		True-up liability
Balance at beginning of period	$	339,187	$	13,294	$	347,610	$	11,463
(Gains) losses included in earnings (1)	—		413		—		520
Unrealized gains (losses) (2)	6,682		—		1,768		—
Purchases	—		—		—		—
Settlements	362		—		47		—
Balance at ending of period	$	346,231	$	13,707	$	349,425	$	11,983
(1) Reported in "Other expense"
(2) 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 March 31, 2015, December 31, 2014, and March 31, 2014. The aggregate fair value, contractual balance and gain or loss on loans held for sale was as follows:
(In thousands)	March 31, 2015		December 31, 2014		March 31, 2014
Aggregate fair value carrying amount	$	4,657	$	14,389	$	7,143
Aggregate unpaid principal / contractual balance	4,489		13,873		6,955
Carrying amount over aggregate unpaid principal (1)	$	168	$	516	$	188
(1) These changes are included in "Loan sales and servicing income" in the Consolidated Statements of Income.
Disclosures about Fair Value of Financial Instruments
The carrying amount and estimated fair value of the Corporation’s financial instruments that are carried at either fair value or cost as of March 31, 2015, December 31, 2014, and March 31, 2014 are shown in the tables below.
	March 31, 2015
	Carrying		Fair Value
(In thousands)	Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	532,425	$	532,425	$	532,425	$	—	$	—
Available-for-sale securities	3,791,059		3,791,059		2,869		3,441,959		346,231
Held-to-maturity securities	2,855,174		2,848,912		—		2,848,912		—
Other securities	148,475		148,475		—		148,475		—
Loans held for sale	3,568		3,568		—		3,568		—
Net originated loans	12,758,492		12,588,147		—		—		12,588,147
Net acquired loans	2,317,386		2,393,942		—		—		2,393,942
Net FDIC acquired loans and loss share receivable	268,459		268,459		—		—		268,459
Accrued interest receivable	69,086		69,086		—		69,086		—
Derivatives	72,573		72,573		—		72,573		—
Financial liabilities:
Deposits	$	19,925,595	$	19,932,571	$	—	$	19,932,571	$	—
Federal funds purchased and securities sold under agreements to repurchase	1,113,371		1,113,371		—		1,113,371		—
Wholesale borrowings	316,628		320,180		—		320,180		—
Long-term debt	512,625		527,018		—		527,018		—
Accrued interest payable	9,620		9,620		—		9,620		—
Derivatives	65,447		65,447		—		65,447		—
	December 31, 2014
	Carrying		Fair Value
(In thousands)	Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	697,424	$	697,424	$	697,424	$	—	$	—
Available-for-sale securities	3,545,288		3,545,288		2,974		3,203,127		339,187
Held-to-maturity securities	2,903,609		2,875,920		—		2,875,920		—
Other securities	148,654		148,654		—		148,654		—
Loans held for sale	13,428		13,428		—		13,428		—
Net originated loans	12,398,116		12,235,530		—		—		12,235,530
Net acquired loans	2,471,723		2,564,842		—		—		2,564,842
Net FDIC acquired loans and loss share receivable	312,659		312,659		—		—		312,659
Accrued interest receivable	63,657		63,657		—		63,657		—
Derivatives	55,197		55,197		—		55,197		—
Financial liabilities:
Deposits	$	19,504,665	$	19,510,192	$	—	$	19,510,192	$	—
Federal funds purchased and securities sold under agreements to repurchase	1,272,591		1,272,591		—		1,272,591		—
Wholesale borrowings	428,071		430,676		—		430,676		—
Long-term debt	505,192		516,476		—		516,476		—
Accrued interest payable	9,820		9,820		—		9,820		—
Derivatives	55,439		55,439		—		55,439		—
	March 31, 2014
	Carrying		Fair Value
(In thousands)	Amount		Total		Level 1		Level 2		Level 3
Financial assets:
Cash and cash equivalents	$	959,285	$	959,285	$	959,285	$	—	$	—
Available for sale securities	3,433,171		3,433,171		3,055		3,080,691		349,425
Held to maturity securities	3,079,620		2,990,161		—		2,990,161		—
Other securities	148,446		148,446		—		148,446		—
Loans held for sale	7,143		7,143		—		7,143		—
Net originated loans	10,734,797		10,621,047		—		—		10,621,047
Net acquired loans	3,232,941		3,367,024		—		—		3,367,024
Net FDIC acquired loans and loss share receivable	495,815		495,815		—		—		495,815
Accrued interest receivable	64,555		64,555		—		64,555		—
Derivatives	46,467		46,467		—		46,467		—
Financial liabilities:
Deposits	$	19,811,674	$	19,810,963	$	—	$	19,810,963	$	—
Federal funds purchased and securities sold under agreements to repurchase	926,195		926,195		—		926,195		—
Wholesale borrowings	349,277		352,923		—		352,923		—
Long-term debt	324,430		330,337		—		330,337		—
Accrued interest payable	5,682		5,682		—		5,682		—
Derivatives	55,106		55,106		—		55,106		—
The following methods and assumptions were used to estimate the fair values of each class of financial instrument presented:
Cash and cash equivalents – Due to their short-term nature, the carrying amount of these instruments approximates the estimated fair value.
Investment securities – See Financial Instruments Measured at Fair Value above.
Loans held for sale – The majority of loans held for sale are residential mortgage loans which are recorded at fair value. All other loans held for sale are recorded at the lower of cost or market, less costs to sell. See Financial Instruments Measured at Fair Value above.
Net originated loans – The originated loan portfolio was segmented based on loan type and repricing characteristics. Carrying values are used to estimate fair values of variable rate loans. A discounted cash flow method was used to estimate the fair value of fixed-rate loans. Discounting was based on the contractual cash flows, and discount rates are based on the year-end yield curve plus a spread that reflects current pricing on loans with similar characteristics. If applicable, prepayment assumptions are factored into the fair value determination based on historical experience and current economic conditions.
Net acquired and FDIC acquired loans – Fair values for acquired and FDIC acquired loans were estimated based on a discounted projected cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and current discount rates. Loans were grouped together according to similar characteristics and were treated in the aggregate when applying various valuation techniques. The discount rates used for loans are based on current market rates for new originations of comparable loans and include adjustments for liquidity concerns. The discount rate does not include a factor for credit losses as that has been included in the estimated cash flows.
Loss share receivable – This loss sharing asset is measured separately from the related covered assets as it is not contractually embedded in the covered assets and is not transferable with the covered assets should the Bank choose to dispose of them. Fair value was estimated using discounted projected cash flows related to the FDIC loss share agreements based on the expected reimbursements for losses and the applicable loss sharing percentages. These cash flows were discounted to reflect the uncertainty of the timing and receipt from the FDIC.
Accrued interest receivable – The carrying amount is considered a reasonable estimate of fair value.
Mortgage servicing rights – See Financial Instruments Measured at Fair Value above.
Deposits – The estimated fair value of deposits with no stated maturity, which includes demand deposits, money market accounts and other savings accounts, are established at carrying value because of the customers' ability to withdraw funds immediately. A discounted cash flow method is used to estimate the fair value of fixed rate time deposits. Discounting was based on the contractual cash flows and the current rates at which similar deposits with similar remaining maturities would be issued.
Federal funds purchased and securities sold under agreements to repurchase, wholesale borrowings and long-term debt – The carrying amount of variable rate borrowings including federal funds purchased approximates the estimated 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	3 Months Ended
	Mar. 31, 2015
Transfers and Servicing [Abstract]
Mortgage Servicing Rights and Mortgage Servicing Activity	Mortgage Servicing Rights and Mortgage Servicing Activity
	In the three months ended March 31, 2015 and 2014, the Corporation sold residential mortgage loans from the held for sale portfolio with unpaid principal balances of $50.3 million and $65.6 million, respectively, and recognized pretax gains of $0.6 million and $1.3 million, respectively, which are included as a component of loan sales and servicing income. As of March 31, 2015 and 2014, the Corporation retained the related MSRs on $45.2 million and $57.1 million, respectively, of the loans sold and receives servicing fees.
	The Corporation serviced for third parties approximately $2.6 billion of residential mortgage loans at March 31, 2015 and $2.7 billion at March 31, 2014. For the three months ended March 31, 2015 and 2014, loan servicing fees, not including valuation changes included in loan sales and servicing income, were $1.6 million and $1.6 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 MSRs 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 MSRs. Additional information can be found in Note 10 (Fair Value Measurement). MSRs are subsequently measured using the amortization method. Accordingly, the MSRs are amortized over the period of, and in proportion to, the estimated net servicing income and is recorded in loan sales and servicing income.
	Changes in the carrying amount of MSRs and MSRs valuation allowance are as follows:
		Three Months Ended March 31,
	(In thousands)	2015			2014
	Balance at beginning of period	$	22,011		$	22,760
	Additions	470			564
	Amortization	(991		)	(855		)
	Balance at end of period	21,490			22,469
	Valuation allowance at beginning of period	(955		)	(282		)
	Additions	(176		)	(143		)
	Valuation allowance at end of period	(1,131		)	(425		)
	MSRs, net carrying balance	$	20,359		$	22,044
	Fair value at end of period	$	20,526		$	22,631
	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 MSRs 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 three months ended March 31, 2015 and 2014.
	Key economic assumptions and the sensitivity of the current fair value of the MSRs related to immediate 10% and 25% adverse changes in those assumptions at March 31, 2015 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 MSRs 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.
	(Dollars in thousands)
	Prepayment speed assumption (annual CPR)	12.63		%
	Decrease in fair value from 10% adverse change	$	778
	Decrease in fair value from 25% adverse change	$	1,510
	Discount rate assumption	9.39		%
	Decrease in fair value from 100 basis point adverse change	$	632
	Decrease in fair value from 200 basis point adverse change	$	1,222
	Expected weighted-average life (in months)	93

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Guarantees	Commitments and Guarantees
	Commitments to Extend Credit
	To accommodate the financial needs its customers, the Corporation issues off-balance sheet financial instruments in connection with commercial and consumer lending activities. The credit risk associated with these instruments is essentially the same as that involved in extending loans to customers and is subject to the Corporation's normal credit approval policies. The Corporation maintains an allowance to cover probable credit losses inherent in lending-related commitments. The reserve for unfunded lending commitments at March 31, 2015, December 31, 2014, and March 31, 2014, included in “accrued expenses and other liabilities” on the Consolidated Balance Sheets, was $4.3 million, $5.8 million, and $7.5 million, respectively.
	The Corporation's credit risk associated with these instruments is represented by the contractual amounts indicated in the following table.
	Unused commitments to extend credit
	(In thousands)		March 31, 2015			December 31, 2014			March 31, 2014
		Commercial	$	3,691,193		$	3,748,690		$	3,394,877
		Consumer	2,343,677			2,387,623			2,237,324
		Total unused commitments to extend credit	$	6,034,870		$	6,136,313		$	5,632,201
	Unused Commitments to Extend Credit. Commitments to extend credit are legally binding agreements to lend to a customer, provided there is no violation of any condition established in the contract. These commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Collateral held varies but may include accounts receivable, inventory, property, plant and equipment, and income-producing commercial properties. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Corporation.
	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 8 (Derivatives and Hedging Activities).
	Guarantees
	The Corporation is a guarantor in certain agreements with third parties. The Corporation's maximum credit risk associated with these instruments is represented by the contractual amounts indicated in the following table.
	Financial guarantees
	(In thousands)		March 31, 2015			December 31, 2014			March 31, 2014
		Standby letters of credit	$	275,736		$	242,390		$	194,118
		Loans sold with recourse	39,996			45,071			38,072
		Total financial guarantees	$	315,732		$	287,461		$	232,190
	Standby Letters of Credit. 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 Corporation has recourse against the customer for any amount required to be paid to a third party under a standby letter of credit. Collateral held varies, but may include marketable securities, equipment, inventory, and real estate. Except for short-term guarantees of $199.8 million at March 31, 2015, the remaining guarantees extend in varying amounts through 2019.
	Loans Sold with Recourse. The Corporation regularly sells service retained residential mortgage loans 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 service released residential mortgage loans to other investors which contain early payment default recourse provisions. As of March 31, 2015, December 31, 2014, and March 31, 2014, the Corporation had sold $33.1 million, $38.1 million, and $27.5 million, respectively, of outstanding residential mortgage loans to GSEs and other investors with recourse provisions. The Corporation had reserved $6.7 million, $7.3 million, and $8.2 million as of March 31, 2015, December 31, 2014, and March 31, 2014, respectively, for estimated losses from representation and warranty obligations and early payment default recourse provisions.
	Due to prior acquisitions, as of March 31, 2015, the Corporation continued to service approximately $3.7 million in manufactured housing loans that were sold with recourse compared to $3.7 million and $6.4 million as of December 31, 2014 and March 31, 2014. As of March 31, 2015, the Corporation had reserved $1.1 million for potential losses from these manufactured housing loans, consistent with the reserve balance at December 31, 2014 and March 31, 2014.
	The total reserve associated with loans sold with recourse was approximately $7.8 million, $8.4 million, and $9.3 million as of March 31, 2015, December 31, 2014, and March 31, 2014, respectively, and is included in accrued taxes, expenses and other liabilities on the Consolidated Balance Sheets. 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 months ended March 31, 2015 and 2014 are as follows:
		Three Months Ended March 31, 2015
	(In thousands)	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchase reserve
	Balance at beginning of period	$	7,250		$	1,124		$	8,374
	Net realized losses	(198		)	—			(198		)
	Net increase (decrease) to reserve	(402		)	2			(400		)
	Balance at end of period	$	6,650		$	1,126		$	7,776
		Three Months Ended March 31, 2014
	(In thousands)	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	8,737		$	1,114		$	9,851
	Net realized losses	(2,593		)	—			(2,593		)
	Net increase to reserve	2,056			3			2,059
	Balance at end of period	$	8,200		$	1,117		$	9,317

Changes_and_Reclassifications_

Changes and Reclassifications Out of Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2015
Changes and Reclassifications Out of Other Comprehensive Income [Abstract]
Comprehensive Income (Loss) Note	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 months ended March 31, 2015 and 2014:
		Three Months Ended March 31, 2015
	(In thousands)	Pretax				Tax			After tax
	Unrealized and realized securities gains and losses:
	Balance at the beginning of the period	$	(8,531	)		$	(2,985	)	$	(5,546	)
	Changes in unrealized securities' holding gains/(losses)	34,117				11,941			22,176
	Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale into held-to-maturity	(504		)		(176		)	(328		)
	Net losses/(gains) realized on sale of securities reclassified to noninterest income	(354		)		(124		)	(230		)
	Balance at the end of the period	24,728				8,656			16,072
	Pension plans and other postretirement benefits:
	Balance at the beginning and end of the period	(102,068		)		(35,722		)	(66,346		)
	Amortization of actuarial gain	1,138				398			740
	Amortization of prior service cost reclassified to other noninterest expense	410				143			267
	Balance at the end of the period	(100,520		)		(35,181		)	(65,339		)
	Total Accumulated Other Comprehensive Income	$	(75,792	)		$	(26,525	)	$	(49,267	)
		Three Months Ended March 31, 2014
	(In thousands)	Pretax				Tax			After tax
	Unrealized and realized securities gains and losses:
	Balance at the beginning of the period	$	(45,072	)		$	(15,775	)	$	(29,297	)
	Changes in unrealized securities' holding gains/(losses)	18,044				6,315			11,729
	Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale into held-to-maturity	(494		)		(173		)	(321		)
	Net losses/(gains) realized on sale of securities reclassified to noninterest income	(56		)		(20		)	(36		)
	Balance at the end of the period	(27,578		)		(9,653		)	(17,925		)
	Pension plans and other postretirement benefits:
	Balance at the beginning and end of the period	(57,812		)		(20,233		)	(37,579		)
	Current year actual losses/(gains)	—				—			—
	Amortization of actuarial losses/(gains)	—				—			—
	Amortization of prior service cost reclassified to other noninterest expense	—				—			—
	Balance at the end of the period	(57,812		)		(20,233		)	(37,579		)
	Total Accumulated Other Comprehensive Income	$	(85,390	)		$	(29,886	)	$	(55,504	)
	The following table presents current period reclassifications out of AOCI by component of comprehensive income for the three months ended March 31, 2015 and 2014:
	(In thousands)		Three Months Ended March 31, 2015				Income statement line item presentation
	Realized (gains)/losses on sale of securities		$	(354	)		Investment securities losses (gains), net
	Tax expense (benefit) (35%)		(124		)		Income tax expense (benefit)
	Reclassified amount, net of tax		$	(230	)
	(In thousands)		Three Months Ended March 31, 2014				Income statement line item presentation
	Realized (gains)/losses on sale of securities		$	(56	)		Investment securities losses (gains), net
	Tax expense (benefit) (35%)		(20		)		Income tax expense (benefit)
	Reclassified amount, net of tax		$	(36	)

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	In preparing these financial statements, subsequent events were evaluated through the time the financial statements were issued. Financial statements are considered issued when they are widely distributed to all shareholders and other financial statement users, or filed with the SEC. 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.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [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%.
New Accounting Pronouncements and Changes in Accounting Principles
	Recently Adopted Accounting Standards
	FASB ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure—a consensus of the FASB Emerging Issues Task Force. The objective of this update is to reduce diversity in practice by addressing the classification of certain foreclosed mortgage loans held by creditors that are either fully or partially guaranteed under government programs. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the
	following conditions are met: 1) the loan has a government guarantee that is not separable from the
	loan before foreclosure; 2) at the time of foreclosure, the creditor has the intent to convey the real
	estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and 3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The ASU is effective for interim and annual periods beginning after December 15, 2014. The amendments can be adopted using either a prospective transition method or a modified retrospective transition method. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	FASB ASU 2014-11, Transfers and Servicing: Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this update require entities to account for repurchase-to-maturity transactions as secured borrowings (rather than as sales with forward repurchase agreements), eliminate accounting guidance on linking repurchase financing transactions, and expand disclosure requirements related to certain transfers of financial assets that are accounted for as sales and certain transfers, such as repos, securities lending transactions, and repurchase-to-maturity transactions, accounted for as secured borrowings. The amendments in ASU 2014-11 are effective for the first interim or annual period beginning after December 15, 2014. The amendments must present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Early application is prohibited. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	FASB ASU 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. The amendments in this update change the definition of a discontinued operation in ASC 205-20 and require additional disclosures for transactions that meet the definition of a discontinued operation and certain other significant transactions that do not meet the discontinued operations criteria. The amendments in ASU 2014-08 are effective prospectively for all disposals, except disposals classified as held for sale before the adoption date or components initially classified as held for sale in periods beginning on or after December 15, 2014, with early adoption permitted. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	FASB ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. ASU 2014-04 amends the guidance in ASC 310-40 by clarifying when an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan. Additionally, the amendments require interim and annual disclosure of both 1) the amount of foreclosed residential real estate property held by the creditor and 2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in ASU 2014-04 are effective for annual periods, and interim period within those annual periods, beginning after December 15, 2014. The amendments can either be adopted using a modified retrospective or a prospective transition method. The adoption of this accounting guidance did not have a material effect on the Corporation’s financial position or results of operations.
	Recently Issued Accounting Standards
	FASB ASU 2015-5, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The amendments in ASU 2015-05 provide guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance will not change GAAP for a customer’s accounting for service contracts. In addition, the guidance in this Update supersedes paragraph 350-40-25-16. Consequently, all software licenses within the scope of Subtopic 350-40 will be accounted for consistent with other licenses of intangible assets. The amendments are effective for public business entities for annual and interim periods within those annual periods, beginning after December 15, 2015. An entity can elect to adopt the amendments either (1) prospectively to all arrangements entered into or materially modified after the effective date or (2) retrospectively. For prospective transition, the only disclosure requirements at transition are the nature of and reason for the change in accounting principle, the transition method, and a qualitative description of the financial statement line items affected by the change. For retrospective transition, the disclosure requirements
	at transition include the requirements for prospective transition and quantitative information about the effects of the accounting change. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.
	FASB ASU 2015-3, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from that debt liability, consistent with the presentation of a debt discount. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this ASU. For public business entities, the amendments in this Update are effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. An entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. The adoption of this guidance is not expected to have a material effect on the Corporations financial position or results of operations.
	FASB ASU 2015-2, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. These amendments modify the evaluation of whether limited partnerships and other similar entities are variable interest entities; eliminate the presumption that a general partner should consolidate a limited partnership; affect the consolidation analysis that are involved with variable interest entities; and provide a scope exception from consolidation for entities that are required to comply or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. A reporting entity may apply the amendments using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption. A reporting entity also may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material effect on the Corporations financial position or results of operations.
	FASB ASU 2014–12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period — a consensus of the FASB Emerging Issues Task Force. The amendments in this update clarify that entities should treat performance targets that can be met after the requisite service period of a share-based payment award as performance conditions that affect vesting. Therefore, an entity would not record compensation expense (measured as of the grant date without taking into account the effect of the performance target) related to an award for which transfer to the employee is contingent on the entity’s satisfaction of a performance target until it becomes probable that the performance target will be met. The ASU does not contain any new disclosure requirements. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. In addition, entities will have the option of applying the guidance either prospectively (i.e., only to awards granted or modified on or after the effective date) or retrospectively. Retrospective application would only apply to awards with performance targets outstanding at or after the beginning of the first annual period presented (i.e., the earliest presented comparative period). The adoption of this guidance is not expected to have a material effect on the Corporations financial position or results of operations.
	FASB ASU 2014-09, Revenue from Contracts with Customers. The amendments in this update supersede virtually all existing GAAP revenue recognition guidance, including most industry-specific revenue recognition guidance. ASU 2014-09 creates a single, principle-based revenue recognition framework and will require entities to apply significantly more judgment and expanded disclosures surrounding revenue recognition. The core principle requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 applies to contracts with customers to provide goods and services, with certain exclusions such as lease contracts, financing arrangements, and financial instruments. The amendments in ASU 2014-09 are effective for fiscal years beginning after December 15, 2016. On April 1, 2015, the FASB proposed to defer the effective date by one year, permitting public organizations to apply this guidance to annual reporting periods beginning after December 15, 2017, with early adoption permitted, but not before the original public organization effective date. The amendments can be adopted using either the full retrospective approach or a modified retrospective approach. Early adoption is prohibited. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment
	(Dollars in thousands)		U.S. Treasury notes & bonds				U.S. Government agency debentures				U.S. States and political subdivisions				Residential mortgage-backed securities - U.S. govt. agencies				Commercial mortgage-backed securities - U.S. govt. agencies				Residential collateralized mortgage obligations - U.S. govt. agencies				Residential collateralized mortgage obligations - non-agency				Commercial collateralized mortgage obligations - U.S. govt. agencies			Asset backed securities - collateralized loan obligations			Corporate debt securities			Total			Weighted Average Yield
	Securities Available-for-Sale
	Remaining maturity:
	One year or less		$	—			$	—			$	14,933			$	1,742			$	15,907			$	14,287			$	—			$	—		$	7,504		$	—		$	54,373		2.71	%
	Over one year through five years		—				—				74,124				789,867				44,313				1,827,726				6				168,720			—			—			2,904,756			2.15	%
	Over five years through ten years		—				2,513				100,111				155,694				80,139				50,547				—				75,339			286,458			—			750,801			2.93	%
	Over ten years		—				—				25,996				—				—				—				—				—			—			52,264			78,260			1.89	%
	Fair Value		$	—			$	2,513			$	215,164			$	947,303			$	140,359			$	1,892,560			$	6			$	244,059		$	293,962		$	52,264		$	3,788,190		2.31	%
	Amortized Cost		$	—			$	2,500			$	208,800			$	924,453			$	139,789			$	1,895,112			$	6			$	241,839		$	297,506		$	61,668		$	3,771,673
	Weighted-Average Yield		—		%		1.25		%		5.24		%		2.55		%		2.05		%		1.92		%		3.39		%		1.89		%	2.7		%	0.98		%	2.31		%
	Weighted-Average Maturity (in years)		—				3.17				5.79				3.67				4.66				3.6				1.99				3.82			6.06			12.56			4.13
	Securities Held-to-Maturity
	Remaining maturity:
	One year or less		$	5,000			$	—			$	57,026			$	—			$	16,384			$	—			$	—			$	—		$	—		$	—		$	78,410		2.05	%
	Over one year through five years		—				—				93,443				472,347				31,832				1,274,419				—				160,403			—			91,089			2,123,533			1.88	%
	Over five years through ten years		—				24,822				220,062				113,999				10,259				22,909				—				94,231			—			—			486,282			3.21	%
	Over ten years		—				—				160,687				—				—				—				—				—			—			—			160,687			5.5	%
	Fair Value		$	5,000			$	24,822			$	531,218			$	586,346			$	58,475			$	1,297,328			$	—			$	254,634		$	—		$	91,089		$	2,848,912		2.31	%
	Amortized Cost		$	5,000			$	25,000			$	523,501			$	577,278			$	57,818			$	1,320,215			$	—			$	256,352		$	—		$	90,010		$	2,855,174
	Weighted-Average Yield		0.31		%		1.43		%		4.7		%		2.17		%		2.15		%		1.6		%		—		%		2.27		%	—		%	2.23		%	2.31		%
	Weighted-Average Maturity (in years)		1				4.58				9.28				4.06				3.27				3.76				—				4.41			—			2.78			4.59
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.
			March 31, 2015
	(In thousands)		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. treasury notes & bonds	$	—			$	—			$	—			$	—
		U.S. government agency debentures	2,500				13				—				2,513
		U.S. states and political subdivisions	208,800				6,750				(386		)		215,164
		Residential mortgage-backed securities:
		U.S. government agencies	924,453				24,799				(1,949		)		947,303
		Commercial mortgage-backed securities:
		U.S. government agencies	139,789				1,231				(661		)		140,359
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,895,112				11,305				(13,857		)		1,892,560
		Non-agency	6				—				—				6
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	241,839				2,602				(382		)		244,059
		Asset-backed securities:
		Collateralized loan obligations	297,506				587				(4,131		)		293,962
		Corporate debt securities	61,668				—				(9,404		)		52,264
		Total debt securities	3,771,673				47,287				(30,770		)		3,788,190
	Equity securities
		Marketable equity securities	2,869				—				—				2,869
		Non-marketable equity securities	—				—				—				—
		Total equity securities	2,869				—				—				2,869
		Total securities available-for-sale	$	3,774,542			$	47,287			$	(30,770	)		$	3,791,059
	Securities held-to-maturity
	Debt securities
		U.S. treasury notes & bonds	$	5,000			$	—			$	—			$	5,000
		U.S. government agency debentures	25,000				—				(178		)		24,822
		U.S. states and political subdivisions	523,501				8,864				(1,147		)		531,218
		Residential mortgage-backed securities:
		U.S. government agencies	577,278				10,745				(1,677		)		586,346
		Commercial mortgage-backed securities:
		U.S. government agencies	57,818				765				(108		)		58,475
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,320,215				1,959				(24,846		)		1,297,328
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	256,352				1,659				(3,377		)		254,634
		Corporate debt securities	90,010				1,079				—				91,089
		Total securities held-to-maturity	$	2,855,174			$	25,071			$	(31,333	)		$	2,848,912
			December 31, 2014
	(In thousands)		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
			Cost												Value
	Securities available-for-sale
	Debt securities
		U.S. government agency debentures	$	2,500			$	—			$	(18	)		$	2,482
		U.S. states and political subdivisions	221,052				6,756				(466		)		227,342
		Residential mortgage-backed securities:
		U.S. government agencies	951,839				22,377				(3,218		)		970,998
		Commercial mortgage-backed securities:
		U.S. government agencies	104,176				598				(1,371		)		103,403
		Residential collateralized mortgage-backed securities:
		U.S. government agencies	1,698,015				4,777				(26,225		)		1,676,567
		Non-agency	7				—				—				7
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies	222,876				863				(1,405		)		222,334
		Asset-backed securities:
		Collateralized loan obligations	297,446				11				(9,613		)		287,844
		Corporate debt securities	61,652				—				(10,315		)		51,337
		Total debt securities	3,559,563				35,382				(52,631		)		3,542,314
	Equity securities
		Marketable equity securities	2,974				—				—				2,974
	Total equity securities	2,974				—				—				2,974
	Total securities available-for-sale	$	3,562,537			$	35,382			$	(52,631	)		$	3,545,288
Securities held-to-maturity
Debt securities
	U.S. treasury notes & bonds	$	5,000			$	—			$	—			$	5,000
	U.S. government agency debentures	25,000				—				(537		)		24,463
	U.S. states and political subdivisions	517,824				12,645				(191		)		530,278
	Residential mortgage-backed securities:
	U.S. government agencies	580,727				7,495				(3,045		)		585,177
	Commercial mortgage-backed securities:
	U.S. government agencies	58,143				281				(329		)		58,095
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,368,534				718				(38,875		)		1,330,377
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	257,642				557				(6,768		)		251,431
	Corporate debt securities	90,739				412				(52		)		91,099
	Total securities held-to-maturity	$	2,903,609			$	22,108			$	(49,797	)		$	2,875,920
		March 31, 2014
(In thousands)		Amortized				Gross Unrealized Gains				Gross Unrealized Losses				Fair
		Cost												Value
Securities available-for-sale
Debt securities
	U.S. states and political subdivisions	$	245,534			$	7,541			$	(2,095	)		$	250,980
	Residential mortgage-backed securities:
	U.S. government agencies	1,013,085				21,415				(10,506		)		1,023,994
	Commercial mortgage-backed securities:
	U.S. government agencies	87,258				36				(2,161		)		85,133
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,586,051				3,857				(41,804		)		1,548,104
	Non-agency	8				—				—				8
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	173,951				331				(1,813		)		172,469
	Asset-backed securities:
	Collateralized loan obligations	297,293				958				(3,692		)		294,559
	Corporate debt securities	61,610				—				(10,022		)		51,588
	Total debt securities	3,464,790				34,138				(72,093		)		3,426,835
Equity Securities
	Marketable equity securities	3,055				—				—				3,055
	Non-marketable equity securities	3,281				—				—				3,281
	Total equity securities	6,336				—				—				6,336
	Total securities available-for-sale	$	3,471,126			$	34,138			$	(72,093	)		$	3,433,171
Securities held-to-maturity
Debt securities
	U.S. treasury notes & bonds	$	4,999			$	6			$	—			$	5,005
	U.S. government agency debentures	25,000				—				(1,117		)		23,883
	U.S states and political subdivisions	517,221				159				(7,186		)		510,194
	Residential mortgage-backed securities:
	U.S. government agencies	644,820				2,311				(8,584		)		638,547
	Commercial mortgage-backed securities:
	U.S. government agencies	56,339				32				(877		)		55,494
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,488,641				—				(64,734		)		1,423,907
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	249,688				138				(9,749		)		240,077
	Corporate debt securities	92,912				437				(295		)		93,054
	Total securities held-to-maturity	$	3,079,620			$	3,083			$	(92,542	)		$	2,990,161
Investments Classified by Contractual Maturity Date
	(Dollars in thousands)		U.S. Treasury notes & bonds				U.S. Government agency debentures				U.S. States and political subdivisions				Residential mortgage-backed securities - U.S. govt. agencies				Commercial mortgage-backed securities - U.S. govt. agencies				Residential collateralized mortgage obligations - U.S. govt. agencies				Residential collateralized mortgage obligations - non-agency				Commercial collateralized mortgage obligations - U.S. govt. agencies			Asset backed securities - collateralized loan obligations			Corporate debt securities			Total			Weighted Average Yield
	Securities Available-for-Sale
	Remaining maturity:
	One year or less		$	—			$	—			$	14,933			$	1,742			$	15,907			$	14,287			$	—			$	—		$	7,504		$	—		$	54,373		2.71	%
	Over one year through five years		—				—				74,124				789,867				44,313				1,827,726				6				168,720			—			—			2,904,756			2.15	%
	Over five years through ten years		—				2,513				100,111				155,694				80,139				50,547				—				75,339			286,458			—			750,801			2.93	%
	Over ten years		—				—				25,996				—				—				—				—				—			—			52,264			78,260			1.89	%
	Fair Value		$	—			$	2,513			$	215,164			$	947,303			$	140,359			$	1,892,560			$	6			$	244,059		$	293,962		$	52,264		$	3,788,190		2.31	%
	Amortized Cost		$	—			$	2,500			$	208,800			$	924,453			$	139,789			$	1,895,112			$	6			$	241,839		$	297,506		$	61,668		$	3,771,673
	Weighted-Average Yield		—		%		1.25		%		5.24		%		2.55		%		2.05		%		1.92		%		3.39		%		1.89		%	2.7		%	0.98		%	2.31		%
	Weighted-Average Maturity (in years)		—				3.17				5.79				3.67				4.66				3.6				1.99				3.82			6.06			12.56			4.13
	Securities Held-to-Maturity
	Remaining maturity:
	One year or less		$	5,000			$	—			$	57,026			$	—			$	16,384			$	—			$	—			$	—		$	—		$	—		$	78,410		2.05	%
	Over one year through five years		—				—				93,443				472,347				31,832				1,274,419				—				160,403			—			91,089			2,123,533			1.88	%
	Over five years through ten years		—				24,822				220,062				113,999				10,259				22,909				—				94,231			—			—			486,282			3.21	%
	Over ten years		—				—				160,687				—				—				—				—				—			—			—			160,687			5.5	%
	Fair Value		$	5,000			$	24,822			$	531,218			$	586,346			$	58,475			$	1,297,328			$	—			$	254,634		$	—		$	91,089		$	2,848,912		2.31	%
	Amortized Cost		$	5,000			$	25,000			$	523,501			$	577,278			$	57,818			$	1,320,215			$	—			$	256,352		$	—		$	90,010		$	2,855,174
	Weighted-Average Yield		0.31		%		1.43		%		4.7		%		2.17		%		2.15		%		1.6		%		—		%		2.27		%	—		%	2.23		%	2.31		%
	Weighted-Average Maturity (in years)		1				4.58				9.28				4.06				3.27				3.76				—				4.41			—			2.78			4.59
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. 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. As illustrated in the tables below, the aggregate fair value of the Corporation's general obligation bonds was greater than $10.0 million in eleven of the thirty-seven U.S. states in which it holds investments.
	(Dollars in thousands)	March 31, 2015
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Ohio	136			$	925			$	124,908			$	125,864
	Michigan	164			857				138,091				140,620
	Illinois	62			1,841				111,649				114,150
	Wisconsin	73			760				53,877				55,497
	Texas	63			784				48,388				49,396
	Pennsylvania	46			1,018				46,085				46,816
	Minnesota	35			697				23,821				24,405
	Washington	31			930				28,194				28,836
	New Jersey	37			747				26,724				27,623
	Missouri	15			1,098				16,032				16,472
	New York	19			629				11,646				11,948
	Other	121			639				76,127				77,365
	Total general obligation bonds	802			$	896			$	705,542			$	718,992
	(Dollars in thousands)	December 31, 2014
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Ohio	137			$	979			$	130,741			$	134,127
	Michigan	169			842				138,325				142,292
	Illinois	66			1,897				121,560				125,169
	Wisconsin	77			841				62,543				64,776
	Texas	64			801				50,307				51,293
	Pennsylvania	45			1,000				44,443				45,006
	Minnesota	42			674				27,740				28,326
	Washington	30			952				27,987				28,558
	New Jersey	37			746				26,755				27,612
	Missouri	19			1,011				18,764				19,207
	New York	19			628				11,659				11,929
	Other	120			650				76,849				78,020
	Total general obligation bonds	825			$	917			$	737,673			$	756,315
	(Dollars in thousands)	March 31, 2014
	U.S. State	# of Issuers			Average Issue Size, Fair Value				Amortized Cost				Fair Value
	Ohio	153			$	1,033			$	159,883			$	158,074
	Illinois	72			1,496				107,451				107,717
	Texas	68			779				52,807				52,941
	Pennsylvania	51			969				50,579				49,428
	Wisconsin	87			683				58,635				59,428
	Minnesota	42			672				27,925				28,213
	New Jersey	37			744				26,844				27,518
	Michigan	171			789				135,588				134,965
	Washington	30			940				28,292				28,210
	Missouri	19			1,012				18,904				19,232
	New York	22			594				13,046				13,075
	Other	129			634				82,317				81,807
	Total general obligation bonds	881			$	863			$	762,271			$	760,608
Other investments	FRB and FHLB stock constitutes the majority of other investments on the Consolidated Balance Sheets.
	(In thousands)	31-Mar-15				31-Dec-14				31-Mar-14
	FRB stock	$	55,681			$	55,681			$	55,435
	FHLB stock	92,381				92,547				92,547
	Other	413				426				464
	Total other investments	$	148,475			$	148,654			$	148,446
Realized Gains and Losses
		Three Months Ended March 31,
	(In thousands)	2015				2014
	Realized gains	$	392			$	220
	Realized losses	(38		)		(164		)
	Net securities (losses)/gains	$	354			$	56
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.
				March 31, 2015
				Less than 12 months										12 months or longer										Total
	(In thousands)			Fair Value				Unrealized				Number Impaired		Fair Value				Unrealized				Number		Fair Value				Unrealized
								Losses				Securities						Losses				Impaired						Losses
																						Securities
	Securities available-for-sale
	Debt securities
		U.S. treasury notes & bonds		$	—			$	—			0		$	—			$	—			0		$	—			$	—
		U.S. states and political subdivisions		14,380				(117		)		23		6,004				(269		)		10		20,384				(386		)
		Residential mortgage-backed securities:
		U.S. government agencies		74,517				(360		)		5		108,052				(1,589		)		8		182,569				(1,949		)
		Commercial mortgage-backed securities:
		U.S. government agencies		49,129				(175		)		7		17,690				(486		)		2		66,819				(661		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies		70,574				(762		)		6		745,621				(13,095		)		53		816,195				(13,857		)
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies		13,206				(24		)		2		61,132				(358		)		6		74,338				(382		)
		Asset-backed securities:
		Collateralized loan obligations		24,087				(209		)		3		181,498				(3,922		)		27		205,585				(4,131		)
		Corporate debt securities		—				—				0		52,263				(9,404		)		8		52,263				(9,404		)
		Total securities available-for-sale		$	245,893			$	(1,647	)		46		$	1,172,260			$	(29,123	)		114		$	1,418,153			$	(30,770	)
	Securities held-to-maturity
	Debt securities
		U.S. treasury notes & bonds		$	5,000			$	—			1		$	—			$	—			0		$	5,000			$	—
		U.S. government agency debentures		$	—			$	—			0		$	24,822			$	(178	)		1		$	24,822			$	(178	)
		U.S. states and political subdivisions		38,202				(1,093		)		26		4,448				(54		)		6		42,650				(1,147		)
		Residential mortgage-backed securities:
		U.S. government agencies		28,386				(123		)		2		110,329				(1,554		)		6		138,715				(1,677		)
		Commercial mortgage-backed securities:
		U.S. government agencies		—				—				0		9,554				(108		)		1		9,554				(108		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies		19,016				(71		)		1		1,095,375				(24,775		)		56		1,114,391				(24,846		)
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies		—				—				0		144,970				(3,377		)		13		144,970				(3,377		)
		Collateralized loan obligations:
		Non-agency		—				—				0		—				—				0		—				—
		Corporate debt securities		—				—				0		—				—				0		—				—
		Total securities held-to-maturity		$	90,604			$	(1,287	)		30		$	1,389,498			$	(30,046	)		83		$	1,480,102			$	(31,333	)
				December 31, 2014
				Less than 12 months											12 months or longer											Total
	(In thousands)			Fair Value				Unrealized				Number			Fair Value				Unrealized				Number			Fair Value				Unrealized
								Losses				Impaired							Losses				Impaired Securities							Losses
												Securities
	Securities available-for-sale
	Debt securities:
		U.S. government agency debentures		$	2,482			$	(18	)		1			$	—			$	—			—			$	2,482			$	(18	)
		U.S. states and political subdivisions		5,637				(11		)		11			22,528				(455		)		36			28,165				(466		)
		Residential mortgage-backed securities:
		U.S. government agencies		50,126				(182		)		5			199,773				(3,036		)		14			249,899				(3,218		)
		Commercial mortgage-backed securities:
		U.S. government agencies		12,284				(55		)		2			45,485				(1,316		)		6			57,769				(1,371		)
		Residential collateralized mortgage-backed securities:
		U.S. government agencies		243,970				(906		)		15			905,478				(25,319		)		64			1,149,448				(26,225		)
		Commercial collateralized mortgage-backed securities:
		U.S. government agencies		31,375				(229		)		4			67,169				(1,176		)		7			98,544				(1,405		)
		Asset-backed securities:
		Collateralized loan obligations		79,042				(1,406		)		15			193,687				(8,207		)		27			272,729				(9,613		)
		Corporate debt securities		—				—				—			51,338				(10,315		)		8			51,338				(10,315		)
		Total securities available-for-sale		$	424,916			$	(2,807	)		53			$	1,485,458			$	(49,824	)		162			$	1,910,374			$	(52,631	)
	Securities held-to-maturity
	Debt securities:
		U.S. government agency debentures		$	—			$	—			—			$	24,463			$	(537	)		1			$	24,463			$	(537	)
		U.S. states and political subdivisions		9,085				(17		)		9			18,371				(174		)		21			27,456				(191		)
	Residential mortgage-backed securities:
	U.S. government agencies		—				—				—			185,361				(3,045		)		10			185,361				(3,045		)
	Commercial mortgage-backed securities:
	U.S. government agencies		9,950				(4		)		2			16,735				(325		)		2			26,685				(329		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		28,333				(149		)		3			1,161,297				(38,726		)		58			1,189,630				(38,875		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		41,474				(55		)		3			171,570				(6,713		)		16			213,044				(6,768		)
	Corporate debt securities		36,933				(52		)		13			—				—				—			36,933				(52		)
	Total securities held-to-maturity		$	125,775			$	(277	)		30			$	1,577,797			$	(49,520	)		108			$	1,703,572			$	(49,797	)
			March 31, 2014
			Less than 12 months											12 months or longer											Total
(In thousands)			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		$	32,307			$	(937	)		53			$	17,231			$	(1,158	)		29			$	49,538			$	(2,095	)
	Residential mortgage-backed securities:
	U.S. government agencies		399,152				(9,543		)		28			15,013				(963		)		3			414,165				(10,506		)
	Commercial mortgage-backed securities:
	U.S. government agencies		63,129				(1,206		)		8			16,891				(955		)		2			80,020				(2,161		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		966,458				(28,054		)		62			273,543				(13,750		)		18			1,240,001				(41,804		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		90,804				(1,475		)		8			6,014				(338		)		2			96,818				(1,813		)
	Asset-backed securities:
	Collateralized loan obligations		201,854				(3,692		)		28			—				—				—			201,854				(3,692		)
	Corporate debt securities		—				—				—			51,588				(10,022		)		8			51,588				(10,022		)
	Total securities available-for-sale		$	1,753,704			$	(44,907	)		187			$	380,281			$	(27,186	)		63			$	2,133,985			$	(72,093	)
Securities held-to-maturity
Debt securities
	U.S. government agency debentures		$	23,883			$	(1,117	)		1			$	—			$	—			—			$	23,883			$	(1,117	)
	U.S. states and political subdivisions		476,766				(6,833		)		735			15,544				(353		)		14			492,310				(7,186		)
	Residential mortgage-backed securities:
	U.S. government agencies		295,148				(7,471		)		16			19,730				(1,113		)		1			314,878				(8,584		)
	Commercial mortgage-backed securities:
	U.S. government agencies		50,533				(877		)		8			—				—				—			50,533				(877		)
	Residential collateralized mortgage-backed securities:
	U.S. government agencies		865,651				(36,384		)		42			558,256				(28,350		)		27			1,423,907				(64,734		)
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies		200,487				(8,507		)		18			19,459				(1,242		)		2			219,946				(9,749		)
	Corporate debt securities		62,051				(295		)		22			—				—				—			62,051				(295		)
	Total securities held-to-maturity		$	1,974,519			$	(61,484	)		842			$	612,989			$	(31,058	)		44			$	2,587,508			$	(92,542	)

Loans_Tables

Loans (Tables)	3 Months Ended
	Mar. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	Loans outstanding as of March 31, 2015, December 31, 2014, and March 31, 2014, net of unearned income, consisted of the following:
	(In thousands)		March 31, 2015				December 31, 2014				March 31, 2014
	Originated loans:
	Commercial		$	8,031,892			$	7,830,085			$	7,083,192
	Residential mortgage		639,980				625,283				555,971
	Installment		2,500,288				2,393,451				1,835,522
	Home equity		1,134,238				1,110,336				946,802
	Credit cards		160,766				164,478				147,917
	Leases		388,873				370,179				257,509
		Total originated loans	12,856,037				12,493,812				10,826,913
	Allowance for originated loan losses		(97,545		)		(95,696		)		(92,116		)
		Net originated loans	$	12,758,492			$	12,398,116			$	10,734,797
	Acquired loans:
	Commercial		$	1,011,170			$	1,086,899			$	1,562,878
	Residential mortgage		378,192				394,484				446,374
	Installment		717,693				764,168				943,354
	Home equity		217,824				233,629				283,309
		Total acquired loans	2,324,879				2,479,180				3,235,915
	Allowance for acquired loan losses		(7,493		)		(7,457		)		(2,974		)
		Net acquired loans	$	2,317,386			$	2,471,723			$	3,232,941
	FDIC acquired loans:
	Commercial		$	179,547			$	211,607			$	341,267
	Residential mortgage		40,470				41,276				49,411
	Installment		4,781				4,874				5,531
	Home equity		65,170				73,365				94,828
	Loss share receivable		20,005				22,033				54,748
		Total FDIC acquired loans	309,973				353,155				545,785
	Allowance for FDIC acquired loan losses		(41,514		)		(40,496		)		(49,970		)
		Net FDIC acquired loans	$	268,459			$	312,659			$	495,815
	Total loans:
	Commercial		$	9,222,609			$	9,128,591			$	8,987,337
	Residential mortgage		1,058,642				1,061,043				1,051,756
	Installment		3,222,762				3,162,493				2,784,407
	Home equity		1,417,232				1,417,330				1,324,939
	Credit cards		160,766				164,478				147,917
	Leases		388,873				370,179				257,509
	Loss share receivable		20,005				22,033				54,748
		Total loans	15,490,889				15,326,147				14,608,613
	Total allowance for loan losses		(146,552		)		(143,649		)		(145,060		)
		Total Net loans	$	15,344,337			$	15,182,498			$	14,463,553
Changes in Carrying Amount of Accretable Yield for Acquired Impaired Loans	Total outstanding acquired impaired loans as of March 31, 2015 and 2014 were $548.2 million and $774.5 million, respectively. The outstanding balance of these loans is the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loans, owed at the reporting date, whether or not currently due and whether or not any such amounts have been charged off. Changes in the carrying amount and accretable yield for acquired impaired loans were as follows for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31,
	Acquired Impaired Loans	2015								2014
	(In thousands)	Accretable Yield				Carrying Amount of Loans				Accretable Yield				Carrying Amount of Loans
	Balance at beginning of period	$	119,450			$	423,209			$	136,646			$	601,000
	Accretion	(11,218		)		11,218				(11,741		)		11,741
	Net reclassifications from nonaccretable to accretable	12,995				—				19,514				—
	Payments received, net	—				(46,114		)		—				(55,542		)
	Disposals	(2,471		)		—				(2,135		)		—
	Balance at end of period	$	118,756			$	388,313			$	142,284			$	557,199
Changes in Loss Share Receivable Associated with Covered Loans	Changes in the loss share receivable for the three months ended March 31, 2015 and 2014 were as follows:
	Loss Share Receivable	Three Months Ended March 31,
	(In thousands)	2015				2014
	Balance at beginning of period	$	22,033			$	61,827
	Amortization	(2,187		)		(5,863		)
	Increase/(decrease) due to impairment (recapture) on FDIC acquired loans	4,227				4,824
	FDIC reimbursement	(4,013		)		(5,087		)
	FDIC acquired loans paid in full	(55		)		(953		)
	Balance at end of the period (1)	$	20,005			$	54,748
	(1) As of March 31, 2015, $6.3 million of the loss share receivable related to non-single family covered loans and $13.8 million related to single family covered loans.
Changes in Carrying Amount of Accretable Yield for Covered Impaired Loans	Total outstanding FDIC acquired impaired loans were $404.4 million and $702.4 million as of March 31, 2015 and 2014, respectively. The outstanding balance of these loans is the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loans, owed at the reporting date, whether or not currently due and whether or not any such amounts have been charged off. Changes in the carrying amount and accretable yield for FDIC acquired impaired loans were as follows for the three months ended March 31, 2015 and 2014:
		Three Months Ended March 31,
	FDIC Acquired Impaired Loans	2015								2014
	(In thousands)	Accretable				Carrying				Accretable				Carrying
		Yield				Amount of				Yield				Amount of
						Loans								Loans
	Balance at beginning of period	$	37,511			$	232,452			$	67,282			$	403,692
	Accretion	(5,567		)		5,567				(12,616		)		12,616
	Net reclassifications between non-accretable and accretable	(56		)		—				6,057				—
	Payments received, net	—				(38,794		)		—				(51,820		)
	(Disposals)/Additions	(2,021		)		—				2,280				—
	Balance at end of period	$	29,867			$	199,225			$	63,003			$	364,488
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 March 31, 2015
	(In thousands)																				≥ 90 Days
	Originated Loans	Days Past Due												Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (1)		Loans
	Commercial
	C&I	$	525			$	515			$	5,846			$	6,886		$	5,311,011	$	5,317,897	$	498	$	18,838
	CRE	4,401				1,177				3,481				9,059			2,123,958		2,133,017		150		9,640
	Construction	—				—				—				—			580,978		580,978		—		—
	Leases	255				—				—				255			388,618		388,873		—		—
	Consumer
	Installment	11,294				3,215				4,157				18,666			2,481,622		2,500,288		3,332		3,016
	Home Equity Lines	1,480				323				1,395				3,198			1,131,040		1,134,238		622		1,780
	Credit Cards	654				301				637				1,592			159,174		160,766		312		523
	Residential Mortgages	9,236				2,515				7,402				19,153			620,827		639,980		3,000		12,288
	Total	$	27,845			$	8,046			$	22,918			$	58,809		$	12,797,228	$	12,856,037	$	7,914	$	46,085
	Acquired Loans																				≥ 90 Days
		Days Past Due												Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
	Commercial
	C&I	$	66			$	131			$	5,366			$	5,563		$	415,247	$	420,810	$	44	$	700
	CRE	4,507				1,380				23,420				29,307			554,765		584,072		252		4,172
	Construction	—				—				676				676			5,612		6,288		—		—
	Consumer
	Installment	4,859				1,322				1,121				7,302			710,391		717,693		521		746
	Home Equity Lines	2,850				1,544				1,172				5,566			212,258		217,824		462		639
	Residential Mortgages	9,894				590				5,250				15,734			362,458		378,192		425		997
	Total	$	22,176			$	4,967			$	37,005			$	64,148		$	2,260,731	$	2,324,879	$	1,704	$	7,254
	FDIC Acquired Loans (2)																				≥ 90 Days
		Days Past Due												Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
	Commercial
	C&I	$	815			$	144			$	4,566			$	5,525		$	37,289	$	42,814	n/a		n/a
	CRE	413				5,218				44,023				49,654			78,254		127,908		n/a		n/a
	Construction	—				—				6,906				6,906			1,919		8,825		n/a		n/a
	Consumer
	Installment	—				110				—				110			4,671		4,781		n/a		n/a
	Home Equity Lines	2,291				564				3,651				6,506			58,664		65,170		n/a		n/a
	Residential Mortgages	5,714				163				3,684				9,561			30,909		40,470		n/a		n/a
	Total	$	9,233			$	6,199			$	62,830			$	78,262		$	211,706	$	289,968	n/a		n/a
	(1) Installment loans 90 days or more past due and accruing include $2.4 million of loans guaranteed by the U.S. government as of March 31, 2015.
	(2) Excludes loss share receivable of $20.0 million as of March 31, 2015.
	(3) Acquired and FDIC acquired impaired loans were not classified as nonperforming assets at March 31, 2015 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 FDIC acquired impaired loans.
	As of December 31, 2014
	(In thousands)																				≥ 90 Days
	Originated Loans	Days Past Due												Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (1)		Loans
	Commercial
	C&I	$	2,212			$	1,162			$	2,670			$	6,044		$	5,169,157	$	5,175,201	$	1,547	$	6,114
	CRE	2,155				1,460				8,864				12,479			2,104,639		2,117,118		1,696		11,033
	Construction	—				—				—				—			537,766		537,766		—		—
	Leases	—				—				—				—			370,179		370,179		—		—
	Consumer
	Installment	14,621				3,647				4,716				22,984			2,370,467		2,393,451		3,695		3,268
	Home Equity Lines	1,357				587				1,206				3,150			1,107,186		1,110,336		569		1,654
	Credit Cards	668				516				860				2,044			162,434		164,478		407		596
	Residential Mortgages	12,086				2,744				8,013				22,843			602,440		625,283		4,242		11,952
	Total	$	33,099			$	10,116			$	26,329			$	69,544		$	12,424,268	$	12,493,812	$	12,156	$	34,617
	Acquired Loans																				≥ 90 Days
		Days Past Due												Total					Total		Past Due and		Nonaccrual
		30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
	Commercial
	C&I	$	92			$	234			$	4,791			$	5,117		$	444,137	$	449,254	$	—	$	787
	CRE	3,479				3,398				23,509				30,386			600,288		630,674		44		4,171
Construction	—				—				685				685			6,286		6,971		—		—
Consumer
Installment	6,204				2,029				1,861				10,094			754,074		764,168		615		1,218
Home Equity Lines	2,819				2,123				2,333				7,275			226,354		233,629		1,519		631
Residential Mortgages	13,062				1,648				7,089				21,799			372,685		394,484		1,293		1,249
Total	$	25,656			$	9,432			$	40,268			$	75,356		$	2,403,824	$	2,479,180	$	3,471	$	8,056
FDIC Acquired Loans (2)																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	58			$	—			$	6,041			$	6,099		$	42,738	$	48,837	n/a		n/a
CRE	234				1,517				47,233				48,984			104,524		153,508		n/a		n/a
Construction	—				—				6,064				6,064			3,198		9,262		n/a		n/a
Consumer
Installment	23				—				34				57			4,817		4,874		n/a		n/a
Home Equity Lines	1,395				870				3,859				6,124			67,241		73,365		n/a		n/a
Residential Mortgages	6,205				91				3,572				9,868			31,408		41,276		n/a		n/a
Total	$	7,915			$	2,478			$	66,803			$	77,196		$	253,926	$	331,122	n/a		n/a
(1) Installment loans 90 days or more past due and accruing include $2.4 million of loans guaranteed by the U.S. government as of December 31, 2014.
(2) Excludes loss share receivable of $22.0 million as of December 31, 2014.
(3) Acquired and covered impaired loans were not classified as nonperforming assets at December 31, 2014 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 March 31, 2014
(In thousands)																				≥ 90 Days
Originated Loans	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (1)		Loans
Commercial
C&I	$	4,088			$	561			$	5,546			$	10,195		$	4,465,961	$	4,476,156	$	2,000	$	6,388
CRE	13,549				3,644				7,999				25,192			2,222,093		2,247,285		804		20,679
Construction	369				—				—				369			359,382		359,751		—		55
Leases	—				—				—				—			257,509		257,509		—		—
Consumer
Installment	9,162				2,659				3,762				15,583			1,819,939		1,835,522		3,286		3,222
Home Equity Lines	1,644				444				902				2,990			943,812		946,802		509		1,653
Credit Cards	783				438				573				1,794			146,123		147,917		262		488
Residential Mortgages	9,632				1,882				8,455				19,969			536,002		555,971		4,999		10,963
Total	$	39,227			$	9,628			$	27,237			$	76,092		$	10,750,821	$	10,826,913	$	11,860	$	43,448
Acquired Loans																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	776			$	720			$	4,224			$	5,720		$	705,912	$	711,632	$	170	$	241
CRE	5,356				3,639				21,995				30,990			806,886		837,876		5		1,259
Construction	—				650				—				650			12,720		13,370		—		—
Consumer
Installment	7,216				2,563				1,619				11,398			931,956		943,354		665		678
Home Equity Lines	3,606				811				3,596				8,013			275,296		283,309		1,078		1,090
Residential Mortgages	11,743				1,822				7,090				20,655			425,719		446,374		31		1,405
Total	$	28,697			$	10,205			$	38,524			$	77,426		$	3,158,489	$	3,235,915	$	1,949	$	4,673
FDIC Acquired Loans (2)																				≥ 90 Days
	Days Past Due												Total					Total		Past Due and		Nonaccrual
	30-59				60-89				≥ 90				Past Due			Current		Loans		Accruing (3)		Loans (3)
Commercial
C&I	$	1,744			$	—			$	11,867			$	13,611		$	51,641	$	65,252	n/a		n/a
CRE	582				449				97,596				98,627			156,966		255,593		n/a		n/a
Construction	1,008				—				16,337				17,345			3,076		20,421		n/a		n/a
Consumer
Installment	—				—				—				—			5,531		5,531		n/a		n/a
Home Equity Lines	758				538				2,093				3,389			91,439		94,828		n/a		n/a
Residential Mortgages	8,374				435				5,872				14,681			34,731		49,412		n/a		n/a
Total	$	12,466			$	1,422			$	133,765			$	147,653		$	343,384	$	491,037	n/a		n/a
(1) Installment loans 90 days or more past due and accruing include $2.3 million of loans guaranteed by the U.S. government as of March 31, 2014.
(2) Excludes loss share receivable of $54.7 million as of March 31, 2014.
(3) Acquired and covered impaired loans were not classified as nonperforming assets at March 31, 2014 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
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 March 31, 2015
	(In thousands)
	Originated Loans	Commercial
		C&I				CRE				Construction				Leases			Total
	Grade 1	$	59,380			$	667			$	—			$	13,052		$	73,099
	Grade 2	191,008				3,368				—				5,782			200,158
	Grade 3	1,405,007				339,027				62,821				69,686			1,876,541
	Grade 4	3,504,600				1,724,516				516,852				297,790			6,043,758
	Grade 5	103,432				29,034				942				1,307			134,715
	Grade 6	54,470				36,405				363				1,256			92,494
	Grade 7	—				—				—				—			—
	Total	$	5,317,897			$	2,133,017			$	580,978			$	388,873		$	8,420,765
	Acquired Loans	Commercial
		C&I				CRE				Construction				Leases			Total
	Grade 1	$	1,069			$	—			$	—			$	—		$	1,069
	Grade 2	—				—				—				—			—
	Grade 3	22,875				24,834				—				—			47,709
	Grade 4	359,751				496,213				5,612				—			861,576
	Grade 5	15,363				21,487				—				—			36,850
	Grade 6	21,752				41,538				676				—			63,966
	Grade 7	—				—				—				—			—
	Total	$	420,810			$	584,072			$	6,288			$	—		$	1,011,170
	FDIC Acquired Loans	Commercial
		C&I				CRE				Construction				Leases			Total
	Grade 1	$	—			$	—			$	—			$	—		$	—
	Grade 2	1,040				—				—				—			1,040
	Grade 3	—				—				—				—			—
	Grade 4	33,352				74,128				579				—			108,059
	Grade 5	39				2,134				—				—			2,173
	Grade 6	8,383				51,646				8,246				—			68,275
	Grade 7	—				—				—				—			—
	Total	$	42,814			$	127,908			$	8,825			$	—		$	179,547
	As of December 31, 2014
	(In thousands)
	Originated Loans	Commercial
		C&I				CRE				Construction				Leases			Total
	Grade 1	$	52,676			$	683			$	678			$	4,451		$	58,488
	Grade 2	186,278				3,454				—				14,959			204,691
	Grade 3	1,340,100				294,281				46,074				71,908			1,752,363
	Grade 4	3,413,446				1,745,470				490,757				277,277			5,926,950
	Grade 5	139,083				29,990				257				1,389			170,719
	Grade 6	43,618				43,240				—				195			87,053
	Grade 7	—				—				—				—			—
	Total	$	5,175,201			$	2,117,118			$	537,766			$	370,179		$	8,200,264
	Acquired Loans	Commercial
		C&I				CRE				Construction				Leases			Total
	Grade 1	$	1,076			$	—			$	—			$	—		$	1,076
	Grade 2	—				—				—				—			—
	Grade 3	20,891				24,867				—				—			45,758
	Grade 4	376,129				532,447				6,286				—			914,862
	Grade 5	23,268				28,382				685				—			52,335
	Grade 6	27,890				44,978				—				—			72,868
	Grade 7	—				—				—				—			—
	Total	$	449,254			$	630,674			$	6,971			$	—		$	1,086,899
	FDIC Acquired Loans	Commercial
		C&I				CRE				Construction				Leases			Total
	Grade 1	$	—			$	—			$	—			$	—		$	—
	Grade 2	1,347				—				—				—			1,347
	Grade 3	—				—				—				—			—
	Grade 4	36,406				86,779				823				—			124,008
	Grade 5	167				3,401				—				—			3,568
	Grade 6	10,917				63,328				8,248				—			82,493
	Grade 7	—				—				191				—			191
Total	$	48,837			$	153,508			$	9,262			$	—		$	211,607
As of March 31, 2014
(In thousands)
Originated Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	28,610			$	240			$	299			$	8,452		$	37,601
Grade 2	135,574				3,797				—				3,620			142,991
Grade 3	940,937				329,377				24,731				58,397			1,353,442
Grade 4	3,276,975				1,823,877				332,227				179,795			5,612,874
Grade 5	61,507				39,245				259				6,857			107,868
Grade 6	32,553				50,749				2,235				388			85,925
Grade 7	—				—				—				—			—
Total	$	4,476,156			$	2,247,285			$	359,751			$	257,509		$	7,340,701
Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	700			$	—			$	—			$	—		$	700
Grade 2	—				—				—				—			—
Grade 3	37,829				24,177				—				—			62,006
Grade 4	609,383				696,070				13,370				—			1,318,823
Grade 5	43,721				51,253				—				—			94,974
Grade 6	19,999				66,376				—				—			86,375
Grade 7	—				—				—				—			—
Total	$	711,632			$	837,876			$	13,370			$	—		$	1,562,878
FDIC Acquired Loans	Commercial
	C&I				CRE				Construction				Leases			Total
Grade 1	$	—			$	—			$	—			$	—		$	—
Grade 2	957				—				—				—			957
Grade 3	—				—				—				—			—
Grade 4	42,228				111,610				653				—			154,491
Grade 5	387				2,883				—				—			3,270
Grade 6	19,864				140,927				19,459				—			180,250
Grade 7	1,816				173				309				—			2,298
Total	$	65,252			$	255,593			$	20,421			$	—		$	341,266

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent	The following tables show activity in the originated ALL, by portfolio segment for the three months ended March 31, 2015 and 2014, as well as the corresponding recorded investment in originated loans at the end of the period:
	As of March 31, 2015
	(In thousands)
	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		$	37,375			$	10,492			$	2,202			$	674			$	12,918			$	19,324			$	7,966			$	4,745		$	95,696
	Charge-offs		(510		)		(215		)		—				—				(5,055		)		(911		)		(1,452		)		(424		)	(8,567		)
	Recoveries		341				—				1				4				3,020				613				366				35			4,380
	Provision for loan losses		2,632				(1,464		)		(451		)		(49		)		2,475				407				921				1,565			6,036
	Allowance for originated loan losses, ending balance		$	39,838			$	8,813			$	1,752			$	629			$	13,358			$	19,433			$	7,801			$	5,921		$	97,545
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	10,042			$	317			$	—			$	—			$	1,005			$	254			$	263			$	1,416		$	13,297
		Collectively evaluated for impairment	29,796				8,496				1,752				629				12,353				19,179				7,538				4,505			84,248
	Total ending allowance for originated loan losses balance		$	39,838			$	8,813			$	1,752			$	629			$	13,358			$	19,433			$	7,801			$	5,921		$	97,545
	Originated loans:
		Originated loans individually evaluated for impairment	$	35,792			$	15,000			$	—			$	—			$	26,882			$	7,632			$	815			$	24,822		$	110,943
		Originated loans collectively evaluated for impairment	5,282,105				2,118,017				580,978				388,873				2,473,406				1,126,606				159,951				615,158			12,745,094
	Total ending originated loan balance		$	5,317,897			$	2,133,017			$	580,978			$	388,873			$	2,500,288			$	1,134,238			$	160,766			$	639,980		$	12,856,037
	As of March 31, 2014
	(In thousands)
	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		$	42,981			$	12,265			$	2,810			$	1,081			$	11,935			$	12,900			$	7,740			$	4,772		$	96,484
	Charge-offs		(5,074		)		(79		)		—				—				(4,584		)		(1,409		)		(1,455		)		(559		)	(13,160		)
	Recoveries		997				4				28				—				2,749				904				418				38			5,138
	Provision for loan losses		1,271				1,195				(1,368		)		(54		)		1,504				765				148				193			3,654
	Allowance for originated loan losses, ending balance		$	40,175			$	13,385			$	1,470			$	1,027			$	11,604			$	13,160			$	6,851			$	4,444		$	92,116
	Ending allowance for originated loan losses balance attributable to loans:
		Individually evaluated for impairment	$	2,866			$	2,918			$	—			$	—			$	1,006			$	223			$	307			$	1,241		$	8,561
		Collectively evaluated for impairment	37,309				10,467				1,470				1,027				10,598				12,937				6,544				3,203			83,555
	Total ending allowance for originated loan losses balance		$	40,175			$	13,385			$	1,470			$	1,027			$	11,604			$	13,160			$	6,851			$	4,444		$	92,116
	Originated loans:
		Originated loans individually evaluated for impairment	$	7,143			$	31,576			$	404			$	—			$	25,818			$	6,931			$	1,034			$	26,198		$	99,104
		Originated loans collectively evaluated for impairment	4,469,013				2,215,709				359,347				257,509				1,809,704				939,871				146,883				529,773			10,727,809
	Total ending originated loan balance		$	4,476,156			$	2,247,285			$	359,751			$	257,509			$	1,835,522			$	946,802			$	147,917			$	555,971		$	10,826,913
	The following table presents the originated ALL and the recorded investment as of December 31, 2014:
	As of December 31, 2014
		(In thousands)
		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	$	72			$	2,914			$	—			$	—			$	1,178			$	207			$	296			$	1,283		$	5,950
		Collectively evaluated for impairment	37,303				7,578				2,202				674				11,740				19,117				7,670				3,462			89,746
	Total ending allowance for originated loan losses balance		$	37,375			$	10,492			$	2,202			$	674			$	12,918			$	19,324			$	7,966			$	4,745		$	95,696
	Originated loans:
		Loans individually evaluated for impairment	$	11,759			$	23,300			$	—			$	—			$	24,905			$	7,379			$	854			$	25,251		$	93,448
		Loans collectively evaluated for impairment	5,163,442				2,093,818				537,766				370,179				2,368,546				1,102,957				163,624				600,032			12,400,364
	Total ending originated loan balance		$	5,175,201			$	2,117,118			$	537,766			$	370,179			$	2,393,451			$	1,110,336			$	164,478			$	625,283		$	12,493,812
allowance for acquired impaired loan losses	The following table presents activity in the allowance for acquired impaired loan losses for the three months ended March 31, 2015 and 2014:
	Allowance for Acquired Impaired Loan Losses	Three Months Ended March 31,
	(In thousands)	2015				2014
	Balance at beginning of the period	$	7,457			$	741
	Charge-offs	—				—
	Recoveries	—				—
	Provision for loan losses	36				2,233
	Balance at end of the period	$	7,493			$	2,974
Schedule of Credit Losses for Financing Receivables, Current	The following table presents activity in the allowance for FDIC acquired impaired loan losses for the three months ended March 31, 2015 and 2014:
	Allowance for FDIC acquired Impaired Loan Losses		Three Months Ended March 31,
	(In thousands)		2015				2014
	Balance at beginning of the period		$	40,496			$	44,027
		Net provision/(recapture) of loan losses before benefit attributable to FDIC loss share agreements	4,225				7,879
		Net (benefit)/recapture attributable to FDIC loss share agreements	(4,227		)		(4,824		)
	Net provision/(recapture) for loan losses		(2		)		3,055
	Increase (decrease) in loss share receivable		4,227				4,824
	Loans charged-off		(3,207		)		(1,936		)
	Balance at end of the period		$	41,514			$	49,970
Impaired Financing Receivables	The following tables provide further detail on impaired loans individually evaluated for impairment and the associated ALL. Certain impaired loans do not have a related ALL as the valuation of these impaired loans exceeded the recorded investment.
	As of March 31, 2015
	Originated Loans						Unpaid								Average
			Recorded				Principal				Related				Recorded
	(In thousands)		Investment				Balance				Allowance				Investment
	Impaired loans with no related allowance
	Commercial
		C&I	$	28,513			$	35,307			$	—			$	25,006
		CRE	9,343				15,478				—				9,634
		Construction	—				—				—				—
	Consumer
		Installment	1,846				2,428				—				1,881
		Home equity line	977				1,222				—				987
		Credit card	21				21				—				23
		Residential mortgages	12,424				15,125				—				12,488
	Subtotal		53,124				69,581				—				50,019
	Impaired loans with a related allowance
	Commercial
		C&I	7,279				7,350				10,042				5,984
		CRE	5,657				5,664				317				5,668
		Construction	—				—				—				—
	Consumer
		Installment	25,036				25,100				1,005				24,181
		Home equity line	6,655				6,655				254				6,715
		Credit card	794				794				263				823
		Residential mortgages	12,398				12,487				1,416				12,414
	Subtotal		57,819				58,050				13,297				55,785
		Total impaired loans	$	110,943			$	127,631			$	13,297			$	105,804
	Note 1: These tables exclude loans fully charged off.
	Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
	As of December 31, 2014
	Originated Loans						Unpaid								Average
			Recorded				Principal				Related				Recorded
	(In thousands)		Investment				Balance				Allowance				Investment
	Impaired loans with no related allowance
	Commercial
		C&I	$	11,451			$	18,207			$	—			$	14,193
		CRE	16,874				22,696				—				18,027
		Construction	—				—				—				—
	Consumer
		Installment	4,460				4,584				—				4,272
		Home equity line	1,723				1,754				—				1,792
		Credit card	16				16				—				32
		Residential mortgages	12,204				15,119				—				12,425
	Subtotal		46,728				62,376				—				50,741
	Impaired loans with a related allowance
	Commercial
		C&I	308				344				72				326
		CRE	6,426				6,440				2,914				4,497
		Construction	—				—				—				—
	Consumer
		Installment	20,445				21,024				1,178				19,513
		Home equity line	5,656				5,875				207				5,944
		Credit card	838				838				296				966
		Residential mortgages	13,047				13,158				1,283				13,121
	Subtotal		46,720				47,679				5,950				44,367
		Total impaired loans	$	93,448			$	110,055			$	5,950			$	95,108
	Note 1: These tables exclude loans fully charged off.
	Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
	As of March 31, 2014
	Originated Loans						Unpaid								Average
			Recorded				Principal				Related				Recorded
	(In thousands)		Investment				Balance				Allowance				Investment
	Impaired loans with no related allowance
Commercial
	C&I	$	2,776			$	5,078			$	—			$	4,690
	CRE	21,777				20,050				—				20,196
	Construction	404				2,777				—				2,943
Consumer
	Installment	2,498				3,502				—				2,579
	Home equity line	997				1,309				—				1,004
	Credit card	42				42				—				50
	Residential mortgages	12,137				14,845				—				12,201
Subtotal		40,631				47,603				—				43,663
Impaired loans with a related allowance
Commercial
	C&I	4,367				9,022				2,866				7,406
	CRE	9,799				9,878				2,918				9,864
	Construction	—				—				—				—
Consumer
	Installment	23,320				23,409				1,006				23,548
	Home equity line	5,934				5,934				223				5,891
	Credit card	992				992				307				1,025
	Residential mortgages	14,061				14,161				1,241				14,067
Subtotal		58,473				63,396				8,561				61,801
	Total impaired loans	$	99,104			$	110,999			$	8,561			$	105,464
Note 1: These tables exclude loans fully charged off.
Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
Troubled Debt Restructurings on Financing ReceivableS	The following tables provide the number of loans modified in a TDR and the recorded investment and unpaid principal balance by loan portfolio as of March 31, 2015, December 31, 2014, and March 31, 2014.
				As of March 31, 2015
	(Dollars in thousands)			Number of Loans			Recorded Investment				Unpaid Principal Balance
	Originated loans
		Commercial
			C&I	47			$	16,923			$	23,666
			CRE	64			12,076				17,325
			Construction	31			—				—
			Total originated commercial	142			28,999				40,991
		Consumer
			Installment	1,186			26,882				27,528
			Home equity lines	276			7,632				7,877
			Credit card	230			815				815
			Residential mortgages	316			24,822				27,612
			Total originated consumer	2,008			60,151				63,832
	Total originated loans			2,150			$	89,150			$	104,823
	Acquired loans
		Commercial
			C&I	1			$	2			$	3
			CRE	3			2,453				2,635
			Total acquired commercial	4			2,455				2,638
		Consumer
			Installment	51			1,195				1,281
			Home equity lines	162			7,310				7,370
			Residential mortgages	30			2,186				2,403
			Total acquired consumer	243			10,691				11,054
	Total acquired loans			247			$	13,146			$	13,692
	FDIC acquired loans
		Commercial
			C&I	8			$	—			$	1,355
			CRE	24			23,895				39,596
			Construction	9			346				9,552
			Total FDIC acquired commercial	41			24,241				50,503
		Consumer
			Home equity lines	70			8,909				8,914
			Residential mortgages	1			185				185
			Total FDIC acquired consumer	71			9,094				9,099
	Total FDIC acquired loans			112			$	33,335			$	59,602
	Total loans
		Commercial
			C&I	56			$	16,925			$	25,024
			CRE	91			38,424				59,556
			Construction	40			346				9,552
			Total commercial	187			55,695				94,132
		Consumer
			Installment	1,237			28,077				28,809
			Home equity lines	508			23,851				24,161
			Credit card	230			815				815
			Residential mortgages	347			27,193				30,200
			Total consumer	2,322			79,936				83,985
	Total loans			2,509			$	135,631			$	178,117
	Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.
				As of December 31, 2014
	(Dollars in thousands)			Number of Loans			Recorded Investment				Unpaid Principal Balance
	Originated loans
		Commercial
			C&I	41			$	7,123			$	13,887
			CRE	67			17,607				22,645
			Construction	31			—				—
			Total originated commercial	139			24,730				36,532
		Consumer
			Installment	1,205			24,905				25,608
			Home equity lines	270			7,379				7,629
			Credit card	238			854				854
		Residential mortgages	315			25,251				28,277
		Total originated consumer	2,028			58,389				62,368
Total originated loans			2,167			$	83,119			$	98,900
Acquired loans
	Commercial
		C&I	2			18				19
		CRE	3			2,542				2,595
		Total acquired commercial	5			2,560				2,614
	Consumer
		Installment	40			975				1,054
		Home equity lines	145			6,932				6,983
		Residential mortgages	26			1,633				1,823
		Total acquired consumer	211			9,540				9,860
Total acquired loans			216			$	12,100			$	12,474
FDIC acquired loans
	Commercial
		C&I	8			$	177			$	1,589
		CRE	24			25,499				42,226
		Construction	9			339				9,552
		Total FDIC acquired commercial	41			26,015				53,367
	Consumer
		Home equity lines	68			8,890				8,901
		Residential Mortgages	2			334				334
		Total FDIC acquired consumer	70			9,224				9,235
Total FDIC acquired loans			111			$	35,239			$	62,602
Total loans
	Commercial
		C&I	51			$	7,318			$	15,495
		CRE	94			45,648				67,466
		Construction	40			339				9,552
		Total commercial	185			53,305				92,513
	Consumer
		Installment	1,245			25,880				26,662
		Home equity lines	483			23,201				23,513
		Credit card	238			854				854
		Residential mortgages	343			27,218				30,434
		Total consumer	2,309			77,153				81,463
Total loans			2,494			$	130,458			$	173,976
Note 1: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.
			As of March 31, 2014
(Dollars in thousands)			Number of Loans			Recorded Investment				Unpaid Principal Balance
Originated loans
	Commercial
		C&I	40			$	5,588			$	12,546
		CRE	57			16,432				17,079
		Construction	32			2,769				2,777
		Total originated commercial	129			24,789				32,402
	Consumer
		Installment	1,434			25,818				26,911
		Home equity lines	244			6,931				7,243
		Credit card	278			1,034				1,034
		Residential mortgages	320			26,199				29,006
		Total originated consumer	2,276			59,982				64,194
Total originated loans			2,405			$	84,771			$	96,596
Acquired loans
	Commercial
		C&I	1			5				5
		CRE	1			1,695				1,687
		Total acquired commercial	2			1,700				1,692
	Consumer
		Installment	23			797				828
		Home equity lines	40			1,926				1,953
		Residential mortgages	11			758				864
		Total acquired consumer	74			3,481				3,645
Total acquired loans			76			$	5,181			$	5,337
FDIC acquired loans
	Commercial
		C&I	4			$	677			$	2,232
		CRE	25			39,939				56,485
		Construction	10			2,560				21,340
		Total FDIC acquired commercial	39			43,176				80,057
	Consumer
		Home equity lines	52			6,269				6,269
		Residential mortgages	2			339				339
		Total FDIC acquired consumer	54			6,608				6,608
Total FDIC acquired loans			93			$	49,784			$	86,665
Total loans
	Commercial
		C&I	45			$	6,270			$	14,783
		CRE	83			58,066				75,251
		Construction	42			5,329				24,117
		Total commercial	170			69,665				114,151
	Consumer
		Installment	1,457			26,615				27,739
		Home equity lines	336			15,126				15,465
		Credit card	278			1,034				1,034
		Residential mortgages	333			27,296				30,209
		Total consumer	2,404			70,071				74,447
Total loans			2,574			$	139,736			$	188,598
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 March 31, 2015, December 31, 2014, and March 31, 2014, including TDRs that continue to accrue interest and TDRs included in nonperforming assets.
	As of March 31, 2015
		Accruing TDRs												Nonaccruing TDRs												Total				Total
	(In thousands)	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
	Originated loans
	Commercial
	C&I	$	16,558			$	—			$	16,558			$	—			$	365			$	365			$	16,923			$	124
	CRE	6,031				1,493				7,524				3,724				828				4,552				12,076				71
	Construction	—				—				—				—				—				—				—				—
	Total originated commercial	22,589				1,493				24,082				3,724				1,193				4,917				28,999				195
	Consumer
	Installment	24,701				409				25,110				1,528				244				1,772				26,882				1,005
	Home equity lines	6,680				113				6,793				811				28				839				7,632				254
	Credit card	721				77				798				—				17				17				815				263
	Residential mortgages	14,299				2,286				16,585				5,020				3,217				8,237				24,822				1,416
	Total originated consumer	46,401				2,885				49,286				7,359				3,506				10,865				60,151				2,938
	Total originated TDRs	$	68,990			$	4,378			$	73,368			$	11,083			$	4,699			$	15,782			$	89,150			$	3,133
	Acquired loans
	Commercial
	C&I	—				—				—				2				—				2				2				2
	CRE	—				—				—				954				1,499				2,453				2,453				135
	Total acquired commercial	—				—				—				956				1,499				2,455				2,455				137
	Consumer
	Installment	1,139				33				1,172				23				—				23				1,195				48
	Home equity lines	6,610				564				7,174				136				—				136				7,310				—
	Residential mortgages	1,335				—				1,335				616				235				851				2,186				—
	Total acquired consumer	9,084				597				9,681				775				235				1,010				10,691				48
	Total acquired TDRs	$	9,084			$	597			$	9,681			$	1,731			$	1,734			$	3,465			$	13,146			$	185
	FDIC acquired loans
	Commercial
	C&I	$	—			$	—			$	—			$	—			$	—			$	—			$	—			$	—
	CRE	—				23,895				23,895				—				—				—				23,895				2,026
	Construction	—				346				346				—				—				—				346				293
	Total FDIC acquired commercial	—				24,241				24,241				—				—				—				24,241				2,319
	Consumer
	Home equity lines	7,703				939				8,642				267				—				267				8,909				24
	Residential mortgages	185				—				185				—				—				—				185				—
	Total FDIC acquired consumer	7,888				939				8,827				267				—				267				9,094				24
	Total FDIC acquired TDRs	$	7,888			$	25,180			$	33,068			$	267			$	—			$	267			$	33,335			$	2,343
	Total loans
	Commercial
	C&I	$	16,558			$	—			$	16,558			$	2			$	365			$	367			$	16,925			$	126
	CRE	6,031				25,388				31,419				4,678				2,327				7,005				38,424				2,232
	Construction	—				346				346				—				—				—				346				293
	Total commercial	22,589				25,734				48,323				4,680				2,692				7,372				55,695				2,651
	Consumer
	Installment	25,840				442				26,282				1,551				244				1,795				28,077				1,053
	Home equity lines	20,993				1,616				22,609				1,214				28				1,242				23,851				278
	Credit card	721				77				798				—				17				17				815				263
	Residential mortgages	15,819				2,286				18,105				5,636				3,452				9,088				27,193				1,416
	Total consumer	63,373				4,421				67,794				8,401				3,741				12,142				79,936				3,010
	Total TDRs	$	85,962			$	30,155			$	116,117			$	13,081			$	6,433			$	19,514			$	135,631			$	5,661
	As of December 31, 2014
		Accruing TDRs												Nonaccruing TDRs												Total				Total
	(In thousands)	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
	Originated loans
	Commercial
	C&I	$	6,740			$	—			$	6,740			$	—			$	383			$	383			$	7,123			$	72
	CRE	12,885				952				13,837				394				3,376				3,770				17,607				159
	Construction	—				—				—				—				—				—				—				—
	Total originated commercial	19,625				952				20,577				394				3,759				4,153				24,730				231
	Consumer
	Installment	22,254				726				22,980				1,663				262				1,925				24,905				1,178
	Home equity lines	6,239				269				6,508				871				—				871				7,379				207
Credit card	775				60				835				15				4				19				854				296
Residential mortgages	13,440				3,538				16,978				5,006				3,267				8,273				25,251				1,283
Total originated consumer	42,708				4,593				47,301				7,555				3,533				11,088				58,389				2,964
Total originated TDRs	$	62,333			$	5,545			$	67,878			$	7,949			$	7,292			$	15,241			$	83,119			$	3,195
Acquired loans
Commercial
C&I	$	15			$	—			$	15			$	3			$	—			$	3			$	18			$	18
CRE	—				—				—				978				1,564				2,542				2,542				134
Total acquired commercial	15				—				15				981				1,564				2,545				2,560				152
Consumer
Installment	841				87				928				24				23				47				975				65
Home equity lines	6,186				607				6,793				139				—				139				6,932				9
Residential mortgages	868				—				868				470				295				765				1,633				2
Total acquired consumer	7,895				694				8,589				633				318				951				9,540				76
Total acquired TDRs	$	7,910			$	694			$	8,604			$	1,614			$	1,882			$	3,496			$	12,100			$	228
FDIC acquired loans
Commercial
C&I	$	—			$	177			$	177			$	—			$	—			$	—			$	177			$	—
CRE	5,123				20,376				25,499				—				—				—				25,499				2,879
Construction	339				—				339				—				—				—				339				295
Total FDIC acquired commercial	5,462				20,553				26,015				—				—				—				26,015				3,174
Consumer
Home equity lines	8,561				—				8,561				329				—				329				8,890				27
Residential mortgages	334				—				334				—				—				—				334				21
Total FDIC acquired consumer	8,895				—				8,895				329				—				329				9,224				48
Total FDIC acquired TDRs	$	14,357			$	20,553			$	34,910			$	329			$	—			$	329			$	35,239			$	3,222
Commercial
C&I	$	6,755			$	177			$	6,932			$	3			$	383			$	386			$	7,318			$	90
CRE	18,008				21,328				39,336				1,372				4,940				6,312				45,648				3,172
Construction	339				—				339				—				—				—				339				295
Total commercial	25,102				21,505				46,607				1,375				5,323				6,698				53,305				3,557
Consumer
Installment	23,095				813				23,908				1,687				285				1,972				25,880				1,243
Home equity lines	20,986				876				21,862				1,339				—				1,339				23,201				243
Credit card	775				60				835				15				4				19				854				296
Residential mortgages	14,642				3,538				18,180				5,476				3,562				9,038				27,218				1,306
Total consumer	59,498				5,287				64,785				8,517				3,851				12,368				77,153				3,088
Total TDRs	$	84,600			$	26,792			$	111,392			$	9,892			$	9,174			$	19,066			$	130,458			$	6,645
As of March 31, 2014
	Accruing TDRs												Nonaccruing TDRs												Total				Total
(In thousands)	Current				Delinquent				Total				Current				Delinquent				Total				TDRs				Allowance
Originated loans
Commercial
C&I	$	1,779			$	—			$	1,779			$	541			$	3,268			$	3,809			$	5,588			$	2,265
CRE	9,254				1,884				11,138				2,124				3,170				5,294				16,432				37
Construction	2,363				350				2,713				56				—				56				2,769				—
Total originated commercial	13,396				2,234				15,630				2,721				6,438				9,159				24,789				2,302
Consumer
Installment	22,757				480				23,237				2,352				229				2,581				25,818				1,006
Home equity lines	5,571				150				5,721				1,210				—				1,210				6,931				223
Credit card	930				95				1,025				—				9				9				1,034				307
Residential mortgages	14,749				2,876				17,625				4,968				3,606				8,574				26,199				1,241
Total originated consumer	44,007				3,601				47,608				8,530				3,844				12,374				59,982				2,777
Total originated TDRs	$	57,403			$	5,835			$	63,238			$	11,251			$	10,282			$	21,533			$	84,771			$	5,079
Acquired loans
Commercial
C&I	$	—			$	—			$	—			$	5			$	—			$	5			$	5			$	—
CRE	1,695				—				1,695				—				—				—				1,695				—
Total acquired commercial	1,695				—				1,695				5				—				5				1,700				—
Consumer
Installment	707				77				784				—				13				13				797				—
Home equity lines	1,322				494				1,816				110				—				110				1,926				—
Residential mortgages	758				—				758				—				—				—				758				—
Total acquired consumer	2,787				571				3,358				110				13				123				3,481				—
Total acquired TDRs	$	4,482			$	571			$	5,053			$	115			$	13			$	128			$	5,181			$	—
FDIC acquired loans
Commercial
C&I	$	300			$	377			$	677			$	—			$	—			$	—			$	677			$	12
CRE	5,035				34,904				39,939				—				—				—				39,939				3,915
Construction	682				1,878				2,560				—				—				—				2,560				68
Total FDIC acquired commercial	6,017				37,159				43,176				—				—				—				43,176				3,995
Consumer
Home equity lines	5,793				140				5,933				336				—				336				6,269				—
Residential mortgages	339				—				339				—				—				—				339				—
Total FDIC acquired consumer	6,132				140				6,272				336				—				336				6,608				—
Total FDIC acquired TDRs	$	12,149			$	37,299			$	49,448			$	336			$	—			$	336			$	49,784			$	3,995
Total loans
Commercial
C&I	$	2,079			$	377			$	2,456			$	546			$	3,268			$	3,814			$	6,270			$	2,277
CRE	15,984				36,788				52,772				2,124				3,170				5,294				58,066				3,952
Construction	3,045				2,228				5,273				56				—				56				5,329				68
Total commercial	21,108				39,393				60,501				2,726				6,438				9,164				69,665				6,297
Consumer
Installment	23,464				557				24,021				2,352				242				2,594				26,615				1,006
Home equity lines	12,686				784				13,470				1,656				—				1,656				15,126				223
Credit card	930				95				1,025				—				9				9				1,034				307
Residential mortgages	15,846				2,876				18,722				4,968				3,606				8,574				27,296				1,241
Total consumer	52,926				4,312				57,238				8,976				3,857				12,833				70,071				2,777
Total TDRs	$	74,034			$	43,705			$	117,739			$	11,702			$	10,295			$	21,997			$	139,736			$	9,074
Schedule of Debtor Troubled Debt Restructuring, Current Period	The following tables provide the number of loans modified in a TDR within the previous 12 months that subsequently defaulted during the three months ended March 31, 2015 and March 31, 2014, as well as the amount defaulted in these restructured loans.
		As of March 31, 2015
	(Dollars in thousands)	Number of Loans			Amount Defaulted
	Originated loans
	Commercial
	C&I	—			$	—
	CRE	—			—
	Construction	—			—
	Total originated commercial	—			—
	Consumer
	Installment	2			—
	Home equity lines	—			—
	Credit card	2			17
	Residential mortgages	—			—
	Total originated consumer	4			$	17
	FDIC acquired loans
	Commercial
	C&I	1			$	427
	CRE	—			—
	Construction	—			—
	Total FDIC acquired commercial	1			$	427
	Acquired loans
	Commercial
	C&I	1			$	55
	CRE	—			—
	Construction	—			—
	Total acquired commercial	1			$	55
	Total loans
	Commercial
	C&I	2			$	482
	CRE	—			—
	Construction	—			—
	Total commercial	2			482
	Consumer
	Installment	2			—
	Home equity lines	—			—
	Credit card	2			17
	Residential mortgages	—			—
	Total consumer	4			17
	Total	6			$	499
		As of March 31, 2014
	(Dollars in thousands)	Number of Loans			Recorded Investment
	Originated loans
	Commercial
	C&I	1			$	1,557
	CRE	1			376
	Construction	—			—
	Total originated commercial	2			1,933
	Consumer
	Installment	—			—
	Home equity lines	—			—
	Credit card	3			4,839
	Residential mortgages	—			—
	Total originated consumer	3			$	4,839
	FDIC acquired loans
	Commercial
	C&I	—			$	—
	CRE	—			—
	Construction	—			—
	Total FDIC acquired commercial	—			$	—
	Total loans
	Commercial
	C&I	1			$	1,557
	CRE	1			376
Construction	—			—
Total commercial	2			1,933
Consumer
Installment	—			—
Home equity lines	—			—
Credit card	3			4,839
Residential mortgages	—			—
Total consumer	3			4,839
Total	5			$	6,772

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Accumulated amortization of intangible assets	The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, lease intangibles and trust relationship intangibles. The following tables show the gross carrying amount, accumulated amortization, and net carrying amount of these intangible assets.
		March 31, 2015
		Gross Carrying		Accumulated			Net Carrying
	(In thousands)	Amount		Amortization			Amount
	Core deposit intangibles (1)	$	82,323	$	(22,073	)	$	60,250
	Lease intangible	238		(185		)	53
	Trust Relationships (2)	14,000		(5,881		)	8,119
		$	96,561	(28,139		)	$	68,422
		December 31, 2014
		Gross Carrying		Accumulated			Net Carrying
	(In thousands)	Amount		Amortization			Amount
	Core deposit intangibles (1)	$	82,323	$	(19,996	)	$	62,327
	Lease intangible	238		(176		)	62
	Trust Relationships (2)	14,000		(5,369		)	8,631
		$	96,561	$	(25,541	)	$	71,020
		March 31, 2014
		Gross Carrying		Accumulated			Net Carrying
	(In thousands)	Amount		Amortization			Amount
	Core deposit intangibles (1)	$	87,533	$	(18,352	)	$	69,181
	Lease intangible	238		(149		)	89
	Trust relationships (2)	14,000		(3,451		)	10,549
		$	101,771	$	(21,952	)	$	79,819

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The reconciliation between basic and diluted EPS using the two-class method and treasury stock method is presented as follows:
		Three Months Ended March 31,
	(Dollars in thousands, except per share amounts)	2015		2014
	Basic EPS:
	Net income	$	57,139	$	53,455
	Less:
	Cash dividends on 5.875% non-cumulative perpetual series A, Preferred Stock	1,469		1,469
	Income allocated to participating securities	407		380
	Net income attributable to common shareholders	$	55,263	$	51,606
	Weighted average Common Stock outstanding used in basic EPS	165,411		165,060
	Basic net income per common share	$	0.33	$	0.31
	Diluted EPS:
	Income used in diluted earnings per common share calculation	$	55,263	$	51,606
	Weighted average Common Stock outstanding used in basic EPS	165,411		165,060
	Add: Common Stock equivalents:
	Warrant and stock plans	592		944
	Weighted average Common and Common Stock equivalent shares outstanding	166,003		166,004
	Diluted net income per common share	$	0.33	$	0.31

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Lines of business results and key performance measures	The following tables present a summary of financial results as of and for the three months ended March 31, 2015 and March 31, 2014:
													FirstMerit
	(In thousands)	Commercial			Retail		Wealth			Other			Consolidated
	March 31, 2015	QTD			QTD		QTD			QTD			QTD
	OPERATIONS:
	Net interest income/(loss)	$	99,844		$	91,095	$	5,353		$	(10,669	)	$	185,623
	Provision (recapture) for loan losses	(526		)	7,533		(170		)	1,411			8,248
	Noninterest income	22,490			21,737		13,976			7,644			65,847
	Noninterest expense	61,653			88,271		13,719			(2,991		)	160,652
	Net income/(loss)	39,785			11,068		3,756			2,530			57,139
	AVERAGES:
	Assets	$	9,454,218		$	5,845,417	$	302,186		$	9,303,273		$	24,905,094
	Loans	9,506,529			5,570,590		292,016			58,046			15,427,181
	Earning assets	9,794,483			5,582,849		292,016			6,431,069			22,100,417
	Deposits	6,886,945			11,124,158		1,240,960			536,862			19,788,925
	Economic capital	848,890			479,188		55,187			1,483,097			2,866,362
													FirstMerit
	(In thousands)	Commercial			Retail		Wealth			Other			Consolidated
	March 31, 2014	QTD			QTD		QTD			QTD			QTD
	OPERATIONS:
	Net interest income/(loss)	$	105,063		$	93,250	$	4,678		$	(9,091	)	$	193,900
	Provision (recapture) for loan losses	5,706			8,339		(45		)	536			14,536
	Noninterest income	21,306			27,035		13,464			5,465			67,270
	Noninterest expense	63,966			96,701		13,518			(4,854		)	169,331
	Net income/(loss)	36,884			9,909		3,035			3,627			53,455
	AVERAGES:
	Assets	$	9,072,390		$	5,449,856	$	241,618		$	9,380,706		$	24,144,570
	Loans	9,061,371			5,084,555		230,429			36,126			14,412,481
	Earning assets	9,308,031			5,101,740		230,429			6,263,663			20,903,863
	Deposits	6,645,640			11,753,015		1,009,811			228,039			19,636,505
	Economic capital	654,922			320,090		57,784			1,700,430			2,733,226

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments Designated as Hedging Instruments	At March 31, 2015, December 31, 2014, and March 31, 2014, 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
		March 31, 2015						December 31, 2014					March 31, 2014					March 31, 2015				December 31, 2014				March 31, 2014
	(In thousands)	Notional/ Contract Amount			Fair Value (1)			Notional/ Contract Amount		Fair Value (1)			Notional/ Contract Amount			Fair Value (1)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)
	Interest rate swaps:
	Commercial Loan Swaps (FRAPS)	$	—		$	—		$	—	$	—		$	5,389		$	1	$	89,591	$	6,063	$	93,313	$	6,683	$	117,543	$	10,392
	Sub Debt Swap	250,000			12,688			250,000		5,256			—			—		—		—		—		—		—		—
	Fair value hedges	$	250,000		$	12,688		$	250,000	$	5,256		$	5,389		$	1	$	89,591	$	6,063	$	93,313	$	6,683	$	117,543	$	10,392
	(1) Included in "Other assets" on the Consolidated Balance Sheets
	(2) Included in "Other liabilities" on the Consolidated Balance Sheet
Derivative Instruments not Designated as Hedging Instruments	As of March 31, 2015, December 31, 2014, and March 31, 2014, 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
		March 31, 2015						December 31, 2014					March 31, 2014					March 31, 2015				December 31, 2014				March 31, 2014
	(In thousands)	Notional/ Contract Amount			Fair Value (1)			Notional/ Contract Amount		Fair Value (1)			Notional/ Contract Amount			Fair Value (1)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)		Notional/ Contract Amount		Fair Value (2)
	Interest rate swaps	$	1,718,850		$	59,147		$	1,673,012	$	48,366		$	1,603,125		$	44,672	$	1,718,850	$	59,147	$	1,673,012	$	48,366	$	1,603,125	$	44,672
	Mortgage loan commitments	51,937			388			102,523		1,408			132,614			1,575		—		—		—		—		—		—
	Forward sales contracts	11,758			—			47,657		—			53,404			167		—		68		—		272		—		—
	Credit contracts	—			—			10,001		—			—			—		80,047		—		69,227		—		49,456		—
	Foreign exchange	40,537			350			22,406		167			17,630			52		10,052		169		6,580		118		15,898		42
	Equity swap	—			—			—		—			—			—		30,896		—		75,138		—		61,859		—
	Total	$	1,823,082		$	59,885		$	1,855,599	$	49,941		$	1,806,773		$	46,466	$	1,839,845	$	59,384	$	1,823,957	$	48,756	$	1,730,338	$	44,714
	(1) Included in "Other assets" on the Consolidated Balance Sheets
	(2) Included in "Other liabilities" on the Consolidated Balance Sheets
Derivative Instruments, Gain (Loss)	Gains and losses recognized in income on non-designated hedging instruments for the three months ended March 31, 2015 and 2014 are as follows:
	Derivatives not		Location of Gain/(Loss)	Amount of Gain / (Loss) Recognized in Income on Derivatives (In thousands)
	designated as hedging		Recognized
	instruments		in Income on	Three Months Ended March 31,
			Derivative	2015			2014
	Mortgage loan commitments		Loan sales and servicing income	$	(1,020	)	$	684
	Forward sales contracts		Loan sales and servicing income	204			(216		)
	Foreign exchange contracts		Other operating income	(877		)	(221		)
	Equity swap		Other operating expense	—			—
	Total			$	(1,693	)	$	247
Offsetting disclosure for derivatives contracts	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 March 31, 2015, December 31, 2014, and March 31, 2014. 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 March 31, 2015
		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
	(In thousands)									Financial instruments (1)			Collateral (2)
	Derivative Assets
	Interest rate swaps - designated	$	12,688		$	—		$	12,688	$	—		$	—		$	12,688
	Interest rate swaps - non-designated	$	67		$	—		$	67	$	(67	)	$	—		$	—
	Foreign exchange	219			—			219		47			(266		)	—
	Total derivative assets	$	12,974		$	—		$	12,974	$	(20	)	$	(266	)	$	12,688
	Derivative liabilities
	Interest rate swaps - designated	$	6,063		$	—		$	6,063	$	—		$	(6,063	)	$	—
	Interest rate swaps - non-designated	59,080			—			59,080		(67		)	(59,013		)	—
	Foreign exchange	47			—			47		47			(94		)	—
	Total derivative liabilities	$	65,190		$	—		$	65,190	$	(20	)	$	(65,170	)	$	—
		As of December 31, 2014
		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
	(In thousands)									Financial instruments (1)			Collateral (2)
	Derivative assets
	Interest rate swaps - designated	5,256			—			5,256		—			—			5,256
	Interest rate swaps - non-designated	$	352		$	—		$	352	$	(352	)	$	—		$	—
	Foreign exchange	134			—			134		28			(162		)	—
	Total derivative assets	$	5,742		$	—		$	5,742	$	(324	)	$	(162	)	$	5,256
	Derivative liabilities
	Interest rate swaps - designated	$	6,683		$	—		$	6,683	$	—		$	(6,683	)	$	—
	Interest rate swaps - non-designated	48,014			—			48,014		(352		)	(47,662		)	—
	Foreign exchange	28			—			28		28			(56		)	—
	Total derivative liabilities	$	54,725		$	—		$	54,725	$	(324	)	$	(54,401	)	$	—
		As of March 31, 2014
		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
	(In thousands)									Financial instruments (1)			Collateral (2)
	Derivative assets
	Interest rate swaps - non-designated	$	2,811		$	—		$	2,811	$	(2,811	)	$	—		$	—
	Foreign exchange	33			—			33		(17		)	(16		)	—
	Total derivative assets	$	2,844		$	—		$	2,844	$	(2,828	)	$	(16	)	$	—
	Derivative liabilities
	Interest rate swaps - designated	$	10,392		$	—		$	10,392	$	—		$	(10,392	)	$	—
	Interest rate swaps - non-designated	41,861			—			41,861		(2,811		)	(39,050		)	—
	Foreign exchange	17			—			17		(17		)	—			—
	Total derivative liabilities	$	52,270		$	—		$	52,270	$	(2,828	)	$	(49,442	)	$	—
	(1) 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.
	(2) 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 Sheets 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 Sheets unless the Corporation defaults.

Benefit_Plans_Tables

Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of Net Benefit Costs	The components of net periodic benefit cost are as follows:
		Pension Benefits
		Three Months Ended March 31,
	(In thousands)	2015			2014
	Service cost	$	207		$	182
	Interest cost	3,517			3,584
	Expected return on assets	(3,902		)	(4,009		)
	Amortization of unrecognized prior service costs	570			634
	Amortization of Actuarial Gain	1,057			708
	Net periodic pension cost	$	1,449		$	1,099
		Postretirement Benefits
		Three Months Ended March 31,
	(In thousands)	2015			2014
	Service cost	$	41		$	16
	Interest cost	144			164
	Amortization of unrecognized prior service costs	(160		)	(117		)
	Amortization of actuarial losses/(gains)	81			59
	Net periodic postretirement cost	$	106		$	122

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015, December 31, 2014, and March 31, 2014:
				Fair Value by Hierarchy
	(In thousands)	31-Mar-15		Level 1		Level 2		Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	2,869	$	2,869	$	—	$	—
	U.S. treasury notes & bonds	—		—		—		—
	U.S. government agency debentures	2,513		—		2,513		—
	U.S. States and political subdivisions	215,164		—		215,164		—
	Residential mortgage-backed securities:
	U.S. government agencies	947,303		—		947,303		—
	Commercial mortgage-backed securities:
	U.S. government agencies	140,359		—		140,359		—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,892,560		—		1,892,560		—
	Non-agency	6		—		1		5
	Commercial collateralized mortgage-backed securities:
	U.S. government agencies	244,059		—		244,059		—
	Corporate debt securities	52,264		—		—		52,264
	Asset-backed securities:
	Collateralized loan obligations	293,962		—		—		293,962
	Total available for sale securities	3,791,059		2,869		3,441,959		346,231
	Residential loans held for sale	3,568		—		3,568		—
	Derivative assets:
	Interest rate swaps - fair value hedges	12,688		—		12,688		—
	Interest rate swaps - nondesignated	59,147		—		59,147		—
	Mortgage loan commitments	388		—		388		—
	Foreign exchange	350		—		350		—
	Total derivative assets	72,573		—		72,573		—
	Total fair value of assets (1)	$	3,867,200	$	2,869	$	3,518,100	$	346,231
	Derivative liabilities:
	Interest rate swaps - fair value hedges	$	6,063	$	—	$	6,063	$	—
	Interest rate swaps - nondesignated	59,147		—		59,147		—
	Forward sales contracts	68		—		68		—
	Foreign exchange	169		—		169		—
	Equity swap	—		—		—		—
	Total derivative liabilities	65,447		—		65,447		—
	True-up liability	13,707		—		—		13,707
	Total fair value of liabilities (1)	$	79,154	$	—	$	65,447	$	13,707
	Nonrecurring fair value measurement
	Mortgage servicing rights (2)	$	20,526	$	—	$	—	$	20,526
	Impaired loans (3)	63,839		—		—		63,839
	Other property (4)	16,956		—		—		16,956
	Other real estate covered by loss share (5)	7,293		—		—		7,293
	Total nonrecurring fair value	$	108,614	$	—	$	—	$	108,614
	(1) There were no transfers between levels 1, 2 or 3 of the fair value hierarchy during the three months ended March 31, 2015.
	(2) MSRs with a recorded investment of $21.5 million were reduced by a specific valuation allowance totaling $1.1 million to a reported carrying value of $20.4 million resulting in recognition of $0.2 million in expense included in loan sales and servicing income in the three months ended March 31, 2015.
	(3) Collateral dependent impaired loans with a recorded investment of $75.6 million were reduced by specific valuation allowance allocations totaling $11.8 million to a reported net carrying value of $63.8 million.
	(4) Amounts do not include assets held at cost at March 31, 2015. During the three months ended March 31, 2015, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.9 million included in noninterest expense.
	(5) Amounts do not include assets held at cost at March 31, 2015. During the three months ended March 31, 2015, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.1 million included in noninterest expense.
				Fair Value by Hierarchy
	(In thousands)	31-Dec-14		Level 1		Level 2		Level 3
	Recurring fair value measurement
	Available-for-sale securities:
	Marketable equity securities	$	2,974	$	2,974	$	—	$	—
	U.S. government agency debentures	2,482		—		2,482		—
	U.S. States and political subdivisions	227,342		—		227,342		—
	Residential mortgage-backed securities:
	U.S. government agencies	970,998		—		970,998		—
	Commercial mortgage-backed securities:
	U.S. government agencies	103,403		—		103,403		—
	Residential collateralized mortgage-backed securities:
	U.S. government agencies	1,676,567		—		1,676,567		—
	Non-agency	7		—		1		6
Commercial collateralized mortgage-backed securities:
U.S. government agencies	222,334		—		222,334		—
Corporate debt securities	51,337		—		—		51,337
Asset-backed securities
Collateralized loan obligations	287,844		—		—		287,844
Total available-for-sale securities	3,545,288		2,974		3,203,127		339,187
Residential loans held for sale	13,428		—		13,428		—
Derivative assets:
Interest rate swaps - fair value hedges	5,256		—		5,256		—
Interest rate swaps - nondesignated	48,366		—		48,366		—
Mortgage loan commitments	1,408		—		1,408		—
Forward sale contracts	—		—		—		—
Foreign exchange	167		—		167		—
Total derivative assets	55,197		—		55,197		—
Total fair value of assets (1)	$	3,613,913	$	2,974	$	3,271,752	$	339,187
Derivative liabilities:
Interest rate swaps - fair value hedges	$	6,683	$	—	$	6,683	$	—
Interest rate swaps - nondesignated	48,366		—		48,366		—
Forward sale contracts	272		—		272		—
Foreign exchange	118		—		118		—
Total derivative liabilities	55,439		—		55,439		—
True-up liability	13,294		—		—		13,294
Total fair value of liabilities (1)	$	68,733	$	—	$	55,439	$	13,294
Nonrecurring fair value measurement
Mortgage servicing rights (2)	$	21,228	$	—	$	—	$	21,228
Impaired loans (3)	56,041		—		—		56,041
Other property (4)	12,510		—		—		12,510
Other real estate covered by loss share (5)	3,614		—		—		3,614
Total nonrecurring fair value	$	93,393	$	—	$	—	$	93,393
(1) There were no transfers between levels 1, 2 or 3 of the fair value hierarchy during the year ended December 31, 2014.
(2) MSRs with a recorded investment of $22.0 million were reduced by a specific valuation allowance totaling $1.0 million to a reported carrying value of $21.1 million resulting in a recovery of previously recognized expense of $0.7 million in recoveries included in loans sales and servicing income in the year ended December 31, 2014.
(3) Collateral dependent impaired loans with a recorded investment of $60.3 million were reduced by specific valuation allowance allocations totaling $4.3 million to a reported net carrying value of $56.0 million.
(4) Amounts do not include assets held at cost at December 31, 2014. During the year ended December 31, 2014, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $2.6 million included in noninterest expense.
(5) Amounts do not include assets held at cost at December 31, 2014. During the year ended December 31, 2014, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $1.2 million included in noninterest expense.
			Fair Value by Hierarchy
(In thousands)	31-Mar-14		Level 1		Level 2		Level 3
Recurring fair value measurement
Available-for-sale securities:
Marketable equity securities	$	3,055	$	3,055	$	—	$	—
Non-marketable equity securities	3,281				10		3,271
U.S. States and political subdivisions	250,980		—		250,980		—
Residential mortgage-backed securities:
U.S. government agencies	1,023,994		—		1,023,994		—
Commercial mortgage-backed securities:
U.S. government agencies	85,133		—		85,133		—
Residential collateralized mortgage-backed securities:
U.S. government agencies	1,548,104		—		1,548,104		—
Non-agency	8		—		1		7
Commercial collateralized mortgage-backed securities:
U.S. government agencies	172,469		—		172,469		—
Corporate debt securities	51,588		—		—		51,588
Asset-backed securities:
Collateralized loan obligations	294,559		—		—		294,559
Total available-for-sale securities	3,433,171		3,055		3,080,691		349,425
Residential loans held for sale	7,143		—		7,143		—
Derivative assets:
Interest rate swaps - fair value hedges	1		—		1		—
Interest rate swaps - nondesignated	44,672		—		44,672		—
Mortgage loan commitments	1,575		—		1,575		—
Forward sale contracts	167		—		167		—
Foreign exchange	52		—		52		—
Total derivative assets	46,467		—		46,467		—
Total fair value of assets (1)	$	3,486,781	$	3,055	$	3,134,301	$	349,425
Derivative liabilities:
Interest rate swaps - fair value hedges	10,392		—		10,392		—
Interest rate swaps - nondesignated	44,672		—		44,672		—
Foreign exchange	42		—		42		—
Total derivative liabilities	55,106		—		55,106		—
True-up liability	11,983		—		—		11,983
Total fair value of liabilities (1)	$	67,089	$	—	$	55,106	$	11,983
Nonrecurring fair value measurement
Mortgage servicing rights (2)	$	22,631	$	—	$	—	$	22,631
Impaired loans (3)	58,296		—		—		58,296
Other property (4)	11,568		—		—		11,568
Other real estate covered by loss share (5)	19,708		—		—		19,708
Total nonrecurring fair value	$	112,203	$	—	$	—	$	112,203
(1) There were no transfers between levels 1, 2 and 3 of the fair value hierarchy during the three months ended March 31, 2014.
(2) MSRs with a recorded investment of $22.5 million were reduced by a specific valuation allowance totaling $0.4 million to a reported carrying value of $22.0 million resulting in recovery of a previously recognized expense of $0.1 million in the three months ended March 31, 2014.
(3) Collateral dependent impaired loans with a recorded investment of $65.3 million were reduced by specific valuation allowance allocations totaling $7.0 million to a reported net carrying value of $58.3 million.
(4) Amounts do not include assets held at cost at March 31, 2014. During the three months ended March 31, 2014, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.8 million included in noninterest expense.
(5) Amounts do not include assets held at cost at March 31, 2014. During the three months ended March 31, 2014, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.4 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 months ended March 31, 2015 and 2014 are summarized as follows:
		Three Months Ended March 31,
		2015				2014
	(In thousands)	Available-for-sale securities		True-up liability		Available-for-sale securities		True-up liability
	Balance at beginning of period	$	339,187	$	13,294	$	347,610	$	11,463
	(Gains) losses included in earnings (1)	—		413		—		520
	Unrealized gains (losses) (2)	6,682		—		1,768		—
	Purchases	—		—		—		—
	Settlements	362		—		47		—
	Balance at ending of period	$	346,231	$	13,707	$	349,425	$	11,983
	(1) Reported in "Other expense"
	(2) Reported in "Other comprehensive income (loss)"
Summary of Change in fair value carrying amount of residential mortgages	The aggregate fair value, contractual balance and gain or loss on loans held for sale was as follows:
	(In thousands)	March 31, 2015		December 31, 2014		March 31, 2014
	Aggregate fair value carrying amount	$	4,657	$	14,389	$	7,143
	Aggregate unpaid principal / contractual balance	4,489		13,873		6,955
	Carrying amount over aggregate unpaid principal (1)	$	168	$	516	$	188
	(1) These changes are included in "Loan sales and servicing income" in the Consolidated Statements of Income.
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 March 31, 2015, December 31, 2014, and March 31, 2014 are shown in the tables below.
		March 31, 2015
		Carrying		Fair Value
	(In thousands)	Amount		Total		Level 1		Level 2		Level 3
	Financial assets:
	Cash and cash equivalents	$	532,425	$	532,425	$	532,425	$	—	$	—
	Available-for-sale securities	3,791,059		3,791,059		2,869		3,441,959		346,231
	Held-to-maturity securities	2,855,174		2,848,912		—		2,848,912		—
	Other securities	148,475		148,475		—		148,475		—
	Loans held for sale	3,568		3,568		—		3,568		—
	Net originated loans	12,758,492		12,588,147		—		—		12,588,147
	Net acquired loans	2,317,386		2,393,942		—		—		2,393,942
	Net FDIC acquired loans and loss share receivable	268,459		268,459		—		—		268,459
	Accrued interest receivable	69,086		69,086		—		69,086		—
	Derivatives	72,573		72,573		—		72,573		—
	Financial liabilities:
	Deposits	$	19,925,595	$	19,932,571	$	—	$	19,932,571	$	—
	Federal funds purchased and securities sold under agreements to repurchase	1,113,371		1,113,371		—		1,113,371		—
	Wholesale borrowings	316,628		320,180		—		320,180		—
	Long-term debt	512,625		527,018		—		527,018		—
	Accrued interest payable	9,620		9,620		—		9,620		—
	Derivatives	65,447		65,447		—		65,447		—
		December 31, 2014
		Carrying		Fair Value
	(In thousands)	Amount		Total		Level 1		Level 2		Level 3
	Financial assets:
	Cash and cash equivalents	$	697,424	$	697,424	$	697,424	$	—	$	—
	Available-for-sale securities	3,545,288		3,545,288		2,974		3,203,127		339,187
	Held-to-maturity securities	2,903,609		2,875,920		—		2,875,920		—
	Other securities	148,654		148,654		—		148,654		—
	Loans held for sale	13,428		13,428		—		13,428		—
	Net originated loans	12,398,116		12,235,530		—		—		12,235,530
	Net acquired loans	2,471,723		2,564,842		—		—		2,564,842
	Net FDIC acquired loans and loss share receivable	312,659		312,659		—		—		312,659
	Accrued interest receivable	63,657		63,657		—		63,657		—
	Derivatives	55,197		55,197		—		55,197		—
	Financial liabilities:
	Deposits	$	19,504,665	$	19,510,192	$	—	$	19,510,192	$	—
	Federal funds purchased and securities sold under agreements to repurchase	1,272,591		1,272,591		—		1,272,591		—
	Wholesale borrowings	428,071		430,676		—		430,676		—
	Long-term debt	505,192		516,476		—		516,476		—
	Accrued interest payable	9,820		9,820		—		9,820		—
	Derivatives	55,439		55,439		—		55,439		—
		March 31, 2014
		Carrying		Fair Value
	(In thousands)	Amount		Total		Level 1		Level 2		Level 3
	Financial assets:
	Cash and cash equivalents	$	959,285	$	959,285	$	959,285	$	—	$	—
	Available for sale securities	3,433,171		3,433,171		3,055		3,080,691		349,425
	Held to maturity securities	3,079,620		2,990,161		—		2,990,161		—
	Other securities	148,446		148,446		—		148,446		—
	Loans held for sale	7,143		7,143		—		7,143		—
	Net originated loans	10,734,797		10,621,047		—		—		10,621,047
	Net acquired loans	3,232,941		3,367,024		—		—		3,367,024
	Net FDIC acquired loans and loss share receivable	495,815		495,815		—		—		495,815
	Accrued interest receivable	64,555		64,555		—		64,555		—
	Derivatives	46,467		46,467		—		46,467		—
	Financial liabilities:
	Deposits	$	19,811,674	$	19,810,963	$	—	$	19,810,963	$	—
	Federal funds purchased and securities sold under agreements to repurchase	926,195		926,195		—		926,195		—
	Wholesale borrowings	349,277		352,923		—		352,923		—
	Long-term debt	324,430		330,337		—		330,337		—
	Accrued interest payable	5,682		5,682		—		5,682		—
	Derivatives	55,106		55,106		—		55,106		—

Mortgage_Servicing_Rights_and_1

Mortgage Servicing Rights and Mortgage Servicing Activity (Tables)	3 Months Ended
	Mar. 31, 2015
Transfers and Servicing [Abstract]
Changes in the carrying amount of mortgage servicing rights	Changes in the carrying amount of MSRs and MSRs valuation allowance are as follows:
		Three Months Ended March 31,
	(In thousands)	2015			2014
	Balance at beginning of period	$	22,011		$	22,760
	Additions	470			564
	Amortization	(991		)	(855		)
	Balance at end of period	21,490			22,469
	Valuation allowance at beginning of period	(955		)	(282		)
	Additions	(176		)	(143		)
	Valuation allowance at end of period	(1,131		)	(425		)
	MSRs, net carrying balance	$	20,359		$	22,044
	Fair value at end of period	$	20,526		$	22,631
Changes in Key economics assumptions	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.
	(Dollars in thousands)
	Prepayment speed assumption (annual CPR)	12.63		%
	Decrease in fair value from 10% adverse change	$	778
	Decrease in fair value from 25% adverse change	$	1,510
	Discount rate assumption	9.39		%
	Decrease in fair value from 100 basis point adverse change	$	632
	Decrease in fair value from 200 basis point adverse change	$	1,222
	Expected weighted-average life (in months)	93

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments to Extend Credit
	Unused commitments to extend credit
	(In thousands)		March 31, 2015			December 31, 2014			March 31, 2014
		Commercial	$	3,691,193		$	3,748,690		$	3,394,877
		Consumer	2,343,677			2,387,623			2,237,324
		Total unused commitments to extend credit	$	6,034,870		$	6,136,313		$	5,632,201
Schedule of Guarantor Obligations	The Corporation is a guarantor in certain agreements with third parties. The Corporation's maximum credit risk associated with these instruments is represented by the contractual amounts indicated in the following table.
	Financial guarantees
	(In thousands)		March 31, 2015			December 31, 2014			March 31, 2014
		Standby letters of credit	$	275,736		$	242,390		$	194,118
		Loans sold with recourse	39,996			45,071			38,072
		Total financial guarantees	$	315,732		$	287,461		$	232,190
Changes in Repurchase Reserve	Changes in the amount of the repurchase reserve for the three months ended March 31, 2015 and 2014 are as follows:
		Three Months Ended March 31, 2015
	(In thousands)	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchase reserve
	Balance at beginning of period	$	7,250		$	1,124		$	8,374
	Net realized losses	(198		)	—			(198		)
	Net increase (decrease) to reserve	(402		)	2			(400		)
	Balance at end of period	$	6,650		$	1,126		$	7,776
		Three Months Ended March 31, 2014
	(In thousands)	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
	Balance at beginning of period	$	8,737		$	1,114		$	9,851
	Net realized losses	(2,593		)	—			(2,593		)
	Net increase to reserve	2,056			3			2,059
	Balance at end of period	$	8,200		$	1,117		$	9,317

Changes_and_Reclassifications_1

Changes and Reclassifications Out of Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2015
Changes and Reclassifications Out of 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 months ended March 31, 2015 and 2014:
		Three Months Ended March 31, 2015
	(In thousands)	Pretax				Tax			After tax
	Unrealized and realized securities gains and losses:
	Balance at the beginning of the period	$	(8,531	)		$	(2,985	)	$	(5,546	)
	Changes in unrealized securities' holding gains/(losses)	34,117				11,941			22,176
	Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale into held-to-maturity	(504		)		(176		)	(328		)
	Net losses/(gains) realized on sale of securities reclassified to noninterest income	(354		)		(124		)	(230		)
	Balance at the end of the period	24,728				8,656			16,072
	Pension plans and other postretirement benefits:
	Balance at the beginning and end of the period	(102,068		)		(35,722		)	(66,346		)
	Amortization of actuarial gain	1,138				398			740
	Amortization of prior service cost reclassified to other noninterest expense	410				143			267
	Balance at the end of the period	(100,520		)		(35,181		)	(65,339		)
	Total Accumulated Other Comprehensive Income	$	(75,792	)		$	(26,525	)	$	(49,267	)
		Three Months Ended March 31, 2014
	(In thousands)	Pretax				Tax			After tax
	Unrealized and realized securities gains and losses:
	Balance at the beginning of the period	$	(45,072	)		$	(15,775	)	$	(29,297	)
	Changes in unrealized securities' holding gains/(losses)	18,044				6,315			11,729
	Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale into held-to-maturity	(494		)		(173		)	(321		)
	Net losses/(gains) realized on sale of securities reclassified to noninterest income	(56		)		(20		)	(36		)
	Balance at the end of the period	(27,578		)		(9,653		)	(17,925		)
	Pension plans and other postretirement benefits:
	Balance at the beginning and end of the period	(57,812		)		(20,233		)	(37,579		)
	Current year actual losses/(gains)	—				—			—
	Amortization of actuarial losses/(gains)	—				—			—
	Amortization of prior service cost reclassified to other noninterest expense	—				—			—
	Balance at the end of the period	(57,812		)		(20,233		)	(37,579		)
	Total Accumulated Other Comprehensive Income	$	(85,390	)		$	(29,886	)	$	(55,504	)
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 months ended March 31, 2015 and 2014:
	(In thousands)		Three Months Ended March 31, 2015				Income statement line item presentation
	Realized (gains)/losses on sale of securities		$	(354	)		Investment securities losses (gains), net
	Tax expense (benefit) (35%)		(124		)		Income tax expense (benefit)
	Reclassified amount, net of tax		$	(230	)
	(In thousands)		Three Months Ended March 31, 2014				Income statement line item presentation
	Realized (gains)/losses on sale of securities		$	(56	)		Investment securities losses (gains), net
	Tax expense (benefit) (35%)		(20		)		Income tax expense (benefit)
	Reclassified amount, net of tax		$	(36	)

Significant_Accounting_Policie2

Significant Accounting Policies (Notes to Consolidated Financial Statements) (Details)	Dec. 31, 2014
	Branch
Accounting Policies [Abstract]
Number of branches	384

Investment_Securities_Amortize

Investment Securities (Amortized Cost Table and Fair Value of Held to Maturity and Available for Sale Securities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	$3,774,542	$3,562,537	$3,471,126
Available-for-sale Securities, Gross Unrealized Gain at End of Period	47,287	35,382	34,138
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-30,770	-52,631	-72,093
Available-for-sale Securities Fair Value	3,791,059	3,545,288	3,433,171
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	2,855,174	2,903,609	3,079,620
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	25,071	22,108	3,083
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-31,333	-49,797	-92,542
Held-to-maturity Securities, Fair Value		2,903,609	3,079,620
Held-to-maturity Securities, Fair Value	2,848,912	2,875,920	2,990,161
US Treasury Securities
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	0
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0
Available-for-sale Securities Fair Value	0
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	5,000	5,000	4,999
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	0	6
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	0	0	0
Held-to-maturity Securities, Fair Value			5,005
Held-to-maturity Securities, Fair Value	5,000	5,000
US Government Agencies Debt Securities
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	2,500	2,500
Available-for-sale Securities, Gross Unrealized Gain at End of Period	13	0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0	-18
Available-for-sale Securities Fair Value	2,513	2,482
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	25,000	25,000	25,000
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	0	0	0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-178	-537	-1,117
Held-to-maturity Securities, Fair Value			23,883
Held-to-maturity Securities, Fair Value	24,822	24,463
U.S. States and political subdivisions debt securities
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	208,800	221,052	245,534
Available-for-sale Securities, Gross Unrealized Gain at End of Period	6,750	6,756	7,541
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-386	-466	-2,095
Available-for-sale Securities Fair Value	215,164	227,342	250,980
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	523,501	517,824	517,221
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	8,864	12,645	159
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-1,147	-191	-7,186
Held-to-maturity Securities, Fair Value			510,194
Held-to-maturity Securities, Fair Value	531,218	530,278
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	924,453	951,839	1,013,085
Available-for-sale Securities, Gross Unrealized Gain at End of Period	24,799	22,377	21,415
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-1,949	-3,218	-10,506
Available-for-sale Securities Fair Value	947,303	970,998	1,023,994
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	577,278	580,727	644,820
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	10,745	7,495	2,311
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-1,677	-3,045	-8,584
Held-to-maturity Securities, Fair Value			638,547
Held-to-maturity Securities, Fair Value	586,346	585,177
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	139,789	104,176	87,258
Available-for-sale Securities, Gross Unrealized Gain at End of Period	1,231	598	36
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-661	-1,371	-2,161
Available-for-sale Securities Fair Value	140,359	103,403	85,133
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	57,818	58,143	56,339
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	765	281	32
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-108	-329	-877
Held-to-maturity Securities, Fair Value			55,494
Held-to-maturity Securities, Fair Value	58,475	58,095
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	1,895,112	1,698,015	1,586,051
Available-for-sale Securities, Gross Unrealized Gain at End of Period	11,305	4,777	3,857
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-13,857	-26,225	-41,804
Available-for-sale Securities Fair Value	1,892,560	1,676,567	1,548,104
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	1,320,215	1,368,534	1,488,641
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	1,959	718	0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-24,846	-38,875	-64,734
Held-to-maturity Securities, Fair Value			1,423,907
Held-to-maturity Securities, Fair Value	1,297,328	1,330,377
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	6	7	8
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
Available-for-sale Securities Fair Value	6	7	8
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	0
Held-to-maturity Securities, Fair Value	0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	241,839	222,876	173,951
Available-for-sale Securities, Gross Unrealized Gain at End of Period	2,602	863	331
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-382	-1,405	-1,813
Available-for-sale Securities Fair Value	244,059	222,334	172,469
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	256,352	257,642	249,688
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	1,659	557	138
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	-3,377	-6,768	-9,749
Held-to-maturity Securities, Fair Value			240,077
Held-to-maturity Securities, Fair Value	254,634	251,431
Collateralized Loan Obligations
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	297,506	297,446	297,293
Available-for-sale Securities, Gross Unrealized Gain at End of Period	587	11	958
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-4,131	-9,613	-3,692
Available-for-sale Securities Fair Value	293,962	287,844	294,559
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	0
Corporate debt securities
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	61,668	61,652	61,610
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	-9,404	-10,315	-10,022
Available-for-sale Securities Fair Value	52,264	51,337	51,588
Securities held to maturity
Held-to-maturity Securities, Amortized Cost	90,010	90,739	92,912
Held-to-maturity Securities, Unrecognized Holding Gain End of Period	1,079	412	437
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period	0	-52	-295
Held-to-maturity Securities, Fair Value			93,054
Held-to-maturity Securities, Fair Value	91,089	91,099
Debt Securities
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	3,771,673	3,559,563	3,464,790
Available-for-sale Securities, Gross Unrealized Gain at End of Period	47,287	35,382	34,138
Available-for-sale Securities, Gross Unrealized Loss at End of Period	-30,770	-52,631	-72,093
Available-for-sale Securities Fair Value	3,788,190	3,542,314	3,426,835
Marketable Securities and Investments Held at Cost
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	2,869	2,974	3,055
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
Available-for-sale Securities Fair Value		2,974	3,055
Other Security Investments
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	0		3,281
Available-for-sale Securities, Gross Unrealized Gain at End of Period	0		0
Available-for-sale Securities, Gross Unrealized Loss at End of Period	0		0
Available-for-sale Securities Fair Value	0		3,281
Held-to-maturity Securities
Securities available for sale
Available-for-sale Securities, Amortized Cost Basis	2,869	2,974	6,336
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
Available-for-sale Securities Fair Value	$2,869	$2,974	$6,336

Investment_Securities_Schedule

Investment Securities (Schedule of General Obligation Bonds) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	802	825	881
General obligation bonds, average issue size, fair value	$896	$917	$863
General obligation bonds, amortized cost	705,542	737,673	762,271
General obligation bonds, fair value	718,992	756,315	760,608
MICHIGAN
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	164	169	171
General obligation bonds, average issue size, fair value	857	842	789
General obligation bonds, amortized cost	138,091	138,325	135,588
General obligation bonds, fair value	140,620	142,292	134,965
OHIO
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	136	137	153
General obligation bonds, average issue size, fair value	925	979	1,033
General obligation bonds, amortized cost	124,908	130,741	159,883
General obligation bonds, fair value	125,864	134,127	158,074
ILLINOIS
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	62	66	72
General obligation bonds, average issue size, fair value	1,841	1,897	1,496
General obligation bonds, amortized cost	111,649	121,560	107,451
General obligation bonds, fair value	114,150	125,169	107,717
TEXAS
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	63	64	68
General obligation bonds, average issue size, fair value	784	801	779
General obligation bonds, amortized cost	48,388	50,307	52,807
General obligation bonds, fair value	49,396	51,293	52,941
WISCONSIN
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	73	77	87
General obligation bonds, average issue size, fair value	760	841	683
General obligation bonds, amortized cost	53,877	62,543	58,635
General obligation bonds, fair value	55,497	64,776	59,428
PENNSYLVANIA
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	46	45	51
General obligation bonds, average issue size, fair value	1,018	1,000	969
General obligation bonds, amortized cost	46,085	44,443	50,579
General obligation bonds, fair value	46,816	45,006	49,428
MINNESOTA
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	35	42	42
General obligation bonds, average issue size, fair value	697	674	672
General obligation bonds, amortized cost	23,821	27,740	27,925
General obligation bonds, fair value	24,405	28,326	28,213
WASHINGTON
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	31	30	30
General obligation bonds, average issue size, fair value	930	952	940
General obligation bonds, amortized cost	28,194	27,987	28,292
General obligation bonds, fair value	28,836	28,558	28,210
NEW JERSEY
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	37	37	37
General obligation bonds, average issue size, fair value	747	746	744
General obligation bonds, amortized cost	26,724	26,755	26,844
General obligation bonds, fair value	27,623	27,612	27,518
MISSOURI
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	15	19	19
General obligation bonds, average issue size, fair value	1,098	1,011	1,012
General obligation bonds, amortized cost	16,032	18,764	18,904
General obligation bonds, fair value	16,472	19,207	19,232
NEW YORK
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	19	19	22
General obligation bonds, average issue size, fair value	629	628	594
General obligation bonds, amortized cost	11,646	11,659	13,046
General obligation bonds, fair value	11,948	11,929	13,075
Other states
general obligation bonds [Line Items]
General Obligation Bonds number of issuers	121	120	129
General obligation bonds, average issue size, fair value	639	650	634
General obligation bonds, amortized cost	76,127	76,849	82,317
General obligation bonds, fair value	$77,365	$78,020	$81,807

Investment_Securities_Other_In

Investment Securities (Other Investments Table) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Other investments
FRB stock	$55,681	$55,681	$55,435
FHLB stock	92,381	92,547	92,547
Other	413	426	464
Total other investments	$148,475	$148,654	$148,446

Investment_Securities_Realized

Investment Securities (Realized Gain Loss Table) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Proceeds and gross unrealized gains and losses on sales of available-for-sale securities
Realized gains	$392	$220
Realized losses	-38	-164
Net securities (losses)/gains	$354	$56

Investment_Securities_Gross_Un

Investment Securities (Gross Unrealized Loss Table) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Securities available for sale
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$245,893	$424,916	$1,753,704
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-1,647	-2,807	-44,907
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	46	53	187
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,172,260	1,485,458	380,281
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-29,123	-49,824	-27,186
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	114	162	63
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,418,153	1,910,374	2,133,985
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-30,770	-52,631	-72,093
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	90,604	125,775	1,974,519
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-1,287	-277	-61,484
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	30	30	842
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,389,498	1,577,797	612,989
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-30,046	-49,520	-31,058
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	83	108	44
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	1,480,102	1,703,572	2,587,508
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-31,333	-49,797	-92,542
US Government Agencies Debt Securities
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0	23,883
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0	-1,117
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	0	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	24,822	24,463	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-178	-537	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	1	1	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	24,822	24,463	23,883
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-178	-537	-1,117
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	14,380	5,637	32,307
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-117	-11	-937
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	23	11	53
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,004	22,528	17,231
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-269	-455	-1,158
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	10	36	29
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	20,384	28,165	49,538
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-386	-466	-2,095
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	38,202	9,085	476,766
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-1,093	-17	-6,833
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	26	9	735
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,448	18,371	15,544
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-54	-174	-353
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	6	21	14
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	42,650	27,456	492,310
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-1,147	-191	-7,186
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	74,517	50,126	399,152
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-360	-182	-9,543
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	5	5	28
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	108,052	199,773	15,013
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-1,589	-3,036	-963
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	8	14	3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	182,569	249,899	414,165
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-1,949	-3,218	-10,506
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	28,386	0	295,148
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-123	0	-7,471
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	2	0	16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	110,329	185,361	19,730
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-1,554	-3,045	-1,113
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	6	10	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	138,715	185,361	314,878
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-1,677	-3,045	-8,584
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	49,129	12,284	63,129
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-175	-55	-1,206
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	7	2	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	17,690	45,485	16,891
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-486	-1,316	-955
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	2	6	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	66,819	57,769	80,020
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-661	-1,371	-2,161
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	9,950	50,533
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	-4	-877
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	2	8
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,554	16,735	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-108	-325	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	1	2	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	9,554	26,685	50,533
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-108	-329	-877
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	70,574	243,970	966,458
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-762	-906	-28,054
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	6	15	62
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	745,621	905,478	273,543
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-13,095	-25,319	-13,750
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	53	64	18
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	816,195	1,149,448	1,240,001
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-13,857	-26,225	-41,804
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	19,016	28,333	865,651
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-71	-149	-36,384
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	1	3	42
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,095,375	1,161,297	558,256
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-24,775	-38,726	-28,350
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	56	58	27
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	1,114,391	1,189,630	1,423,907
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-24,846	-38,875	-64,734
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	13,206	31,375	90,804
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-24	-229	-1,475
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	2	4	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	61,132	67,169	6,014
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-358	-1,176	-338
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	6	7	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	74,338	98,544	96,818
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-382	-1,405	-1,813
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	41,474	200,487
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	-55	-8,507
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	3	18
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	144,970	171,570	19,459
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-3,377	-6,713	-1,242
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	13	16	2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	144,970	213,044	219,946
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	-3,377	-6,768	-9,749
Collateralized Loan Obligations
Securities available for sale
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	24,087	79,042	201,854
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-209	-1,406	-3,692
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	3	15	28
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	181,498	193,687	0
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-3,922	-8,207	0
Available for Sale Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	27	27	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	205,585	272,729	201,854
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-4,131	-9,613	-3,692
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0
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	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	0
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	52,263	51,338	51,588
available for sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss at end of period	-9,404	-10,315	-10,022
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	52,263	51,338	51,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	-9,404	-10,315	-10,022
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	36,933	62,051
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	-52	-295
Held to Maturity Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	13	22
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0	0
Held to Maturity Securities in Unrealized Loss Positions Twelve Months or Longer Qualitative Disclosure Number of Positions	0	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	0	36,933	62,051
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	0	-52	-295
US Treasury Securities
Securities available for sale
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	2,482
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	-18
Available for Sale Securities in Unrealized Loss Positions Less than Twelve Months Qualitative Disclosure Number of Positions	0	1
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	0	2,482
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	0	-18
Securities held to maturity
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	5,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0
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	5,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	$0

Investment_Securities_Maturiti

Investment Securities (Maturities Table) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	4 years 1 month 16 days
Securities Available for Sale
One year or less	$54,373
Available for Sale Securities Debt Maturities Maturity Period of One Year or Less Weighted Average Yield	2.71%
Over one year through five years	2,904,756
Available for Sale Securities Debt Maturities Maturity Period over One Year Through Five Years Weighted Average Yield	2.15%
Over five years through ten years	750,801
Available for Sale Securities Debt Maturities Maturity Period over Five Years Through Ten Years Weighted Average Yield	2.93%
Over ten years	78,260
Available for Sale Securities Debt Maturities Maturity Period over Ten Years Weighted Average Yield	1.89%
Available-for-sale	3,791,059	3,545,288	3,433,171
Amortized Cost	3,774,542	3,562,537	3,471,126
Weighted-Average Yield	2.31%
Securities Held to Maturity
One year or less	78,410
Over one year through five years	2,123,533
Held to Maturity Securities Debt Maturities Maturity Period over One Year Through Five Years Weighted Average Yield	2.05%
Over five years through ten years	486,282
Held to Maturity Securities Debt Maturities Maturity Period over Five Years Through Ten Years Weighted Average Yield	1.88%
Over ten years	160,687
Held to Maturity Securities Debt Maturities Maturity Period Weighted Average Yield	5.50%
Held-to-maturity Securities, Fair Value	2,848,912	2,875,920	2,990,161
Held-to-maturity Securities, Carrying Amount		2,903,609	3,079,620
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,855,174	2,903,609	3,079,620
Weighted Average Yield	2.31%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	4 years 7 months 3 days
Held to Maturity Securities Debt Maturities Maturity Period over Ten Years Weighted Average Yield	3.21%
US Government Agencies Debt Securities
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	3 years 2 months 3 days
Securities Available for Sale
One year or less	0
Over one year through five years	0
Over five years through ten years	2,513
Over ten years	0
Available-for-sale	2,513	2,482
Amortized Cost	2,500	2,500
Weighted-Average Yield	1.25%
Securities Held to Maturity
One year or less	0
Over one year through five years	0
Over five years through ten years	24,822
Over ten years	0
Held-to-maturity Securities, Fair Value	24,822	24,463
Held-to-maturity Securities, Carrying Amount			23,883
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	25,000	25,000	25,000
Weighted Average Yield	1.43%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	4 years 6 months 30 days
US Treasury Securities
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	1 year 0 months 0 days
Securities Available for Sale
One year or less	0
Over one year through five years	0
Over five years through ten years	0
Over ten years	0
Available-for-sale	0
Amortized Cost	0
Weighted-Average Yield	0.00%
Securities Held to Maturity
One year or less	5,000
Over one year through five years	0
Over five years through ten years	0
Over ten years	0
Held-to-maturity Securities, Fair Value	5,000	5,000
Held-to-maturity Securities, Carrying Amount			5,005
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	5,000	5,000	4,999
Weighted Average Yield	0.31%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	0 years 0 months 1 day
U.S. States and political subdivisions debt securities
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	5 years 9 months 15 days
Securities Available for Sale
One year or less	14,933
Over one year through five years	74,124
Over five years through ten years	100,111
Over ten years	25,996
Available-for-sale	215,164	227,342	250,980
Amortized Cost	208,800	221,052	245,534
Weighted-Average Yield	5.24%
Securities Held to Maturity
One year or less	57,026
Over one year through five years	93,443
Over five years through ten years	220,062
Over ten years	160,687
Held-to-maturity Securities, Fair Value	531,218	530,278
Held-to-maturity Securities, Carrying Amount			510,194
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	523,501	517,824	517,221
Weighted Average Yield	4.70%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	9 years 3 months 12 days
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	3 years 8 months 1 day
Securities Available for Sale
One year or less	1,742
Over one year through five years	789,867
Over five years through ten years	155,694
Over ten years	0
Available-for-sale	947,303	970,998	1,023,994
Amortized Cost	924,453	951,839	1,013,085
Weighted-Average Yield	2.55%
Securities Held to Maturity
One year or less	0
Over one year through five years	472,347
Over five years through ten years	113,999
Over ten years	0
Held-to-maturity Securities, Fair Value	586,346	585,177
Held-to-maturity Securities, Carrying Amount			638,547
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	577,278	580,727	644,820
Weighted Average Yield	2.17%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	4 years 0 months 22 days
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	4 years 7 months 29 days
Securities Available for Sale
One year or less	15,907
Over one year through five years	44,313
Over five years through ten years	80,139
Over ten years	0
Available-for-sale	140,359	103,403	85,133
Amortized Cost	139,789	104,176	87,258
Weighted-Average Yield	2.05%
Securities Held to Maturity
One year or less	16,384
Over one year through five years	31,832
Over five years through ten years	10,259
Over ten years	0
Held-to-maturity Securities, Fair Value	58,475	58,095
Held-to-maturity Securities, Carrying Amount			55,494
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	57,818	58,143	56,339
Weighted Average Yield	2.15%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	3 years 3 months 8 days
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	3 years 7 months 7 days
Securities Available for Sale
One year or less	14,287
Over one year through five years	1,827,726
Over five years through ten years	50,547
Over ten years	0
Available-for-sale	1,892,560	1,676,567	1,548,104
Amortized Cost	1,895,112	1,698,015	1,586,051
Weighted-Average Yield	1.92%
Securities Held to Maturity
One year or less	0
Over one year through five years	1,274,419
Over five years through ten years	22,909
Over ten years	0
Held-to-maturity Securities, Fair Value	1,297,328	1,330,377
Held-to-maturity Securities, Carrying Amount			1,423,907
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	1,320,215	1,368,534	1,488,641
Weighted Average Yield	1.60%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	3 years 9 months 4 days
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	1 year 11 months 27 days
Securities Available for Sale
One year or less	0
Over one year through five years	6
Over five years through ten years	0
Over ten years	0
Available-for-sale	6	7	8
Amortized Cost	6	7	8
Weighted-Average Yield	3.39%
Securities Held to Maturity
One year or less	0
Over one year through five years	0
Over five years through ten years	0
Over ten years	0
Held-to-maturity Securities, Carrying Amount	0
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	0
Weighted Average Yield	0.00%
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	3 years 9 months 26 days
Securities Available for Sale
One year or less	0
Over one year through five years	168,720
Over five years through ten years	75,339
Over ten years	0
Available-for-sale	244,059	222,334	172,469
Amortized Cost	241,839	222,876	173,951
Weighted-Average Yield	1.89%
Securities Held to Maturity
One year or less	0
Over one year through five years	160,403
Over five years through ten years	94,231
Over ten years	0
Held-to-maturity Securities, Fair Value	254,634	251,431
Held-to-maturity Securities, Carrying Amount			240,077
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	256,352	257,642	249,688
Weighted Average Yield	2.27%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	4 years 4 months 30 days
Collateralized Loan Obligations
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	6 years 0 months 22 days
Securities Available for Sale
One year or less	7,504
Over one year through five years	0
Over five years through ten years	286,458
Over ten years	0
Available-for-sale	293,962	287,844	294,559
Amortized Cost	297,506	297,446	297,293
Weighted-Average Yield	2.70%
Securities Held to Maturity
One year or less	0
Over one year through five years	0
Over five years through ten years	0
Over ten years	0
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	0
Weighted Average Yield	0.00%
Corporate debt securities
Schedule of Available-for-Sale and Held-to-Maturity Securities [Line Items]
Available for Sale Securities, Debt Maturities, Weighted-Average Mat	12 years 6 months 23 days
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	52,264
Available-for-sale	52,264	51,337	51,588
Amortized Cost	61,668	61,652	61,610
Weighted-Average Yield	0.98%
Securities Held to Maturity
One year or less	0
Over one year through five years	91,089
Over five years through ten years	0
Over ten years	0
Held-to-maturity Securities, Fair Value	91,089	91,099
Held-to-maturity Securities, Carrying Amount			93,054
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	90,010	90,739	92,912
Weighted Average Yield	2.23%
Held to Maturity Securities Debt Maturities-Weighted Aver Maturity	2 years 9 months 11 days
Debt Securities
Securities Available for Sale
Available-for-sale	3,788,190	3,542,314	3,426,835
Amortized Cost	3,771,673	3,559,563	3,464,790
Fair Value, Inputs, Level 3
Securities Available for Sale
Available-for-sale	346,231	339,187	349,425
Securities Held to Maturity
Held-to-maturity Securities, Fair Value	0	0	0
Fair Value, Inputs, Level 3 | U.S. States and political subdivisions debt securities
Securities Available for Sale
Available-for-sale	0	0	0
Fair Value, Inputs, Level 3 | Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Securities Available for Sale
Available-for-sale	0	0	0
Fair Value, Inputs, Level 3 | Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Securities Available for Sale
Available-for-sale	0	0	0
Fair Value, Inputs, Level 3 | Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises
Securities Available for Sale
Available-for-sale	0	0	0
Fair Value, Inputs, Level 3 | Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency
Securities Available for Sale
Available-for-sale	5	6	7
Fair Value, Inputs, Level 3 | Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Securities Available for Sale
Available-for-sale	0	0	0
Fair Value, Inputs, Level 3 | Collateralized Loan Obligations
Securities Available for Sale
Available-for-sale		287,844	294,559
Securities Held to Maturity
Held-to-maturity Securities, Carrying Amount	0
Fair Value, Inputs, Level 3 | Corporate debt securities
Securities Available for Sale
Available-for-sale		$51,337	$51,588

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Investments [Line Items]
Available for sale securities, net unrealized losses	$10,300,000	($44,900,000)	($127,400,000)
Unrealized Gain (Loss) on Investments	-62,100,000	-102,400,000	-164,600,000
Number of states with aggregate fair value of general obligation bonds greater than $10 million	11
Available-for-sale Securities, Gross Unrealized Loss at End of Period	30,770,000	52,631,000	72,093,000
Number of Single Issuer Trust Preferred Securities With Stated Maturities	8
Percent of trust preferred securities included in fair value of entire investment portfolio	1.00%
Available-for-sale	3,791,059,000	3,545,288,000	3,433,171,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	30,770,000	52,631,000	72,093,000
Total number of states general obligation bonds are held	37
Maximum portfolio concentration in municipal securities per corporate investment policy	20.00%
Other investment securities pledged	3,500,000,000	2,800,000,000	3,400,000,000
Amount of municipal securities with a combined individual state to total municipal outstanding equal to or less than, per corporate policy	25.00%
12 states
Schedule of Investments [Line Items]
General obligation bonds, aggregate fair value	10,000,000
Collateralized Loan Obligations
Schedule of Investments [Line Items]
Available-for-sale Securities, Gross Unrealized Loss at End of Period	4,131,000	9,613,000	3,692,000
Available-for-sale	293,962,000	287,844,000	294,559,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss at End of Period	$4,131,000	$9,613,000	$3,692,000

Loans_Schedule_of_Accounts_Not

Loans (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	$9,222,609	$9,128,591	$8,987,337
Loans and Leases Receivable, Gross, Consumer, Mortgage	1,058,642	1,061,043	1,051,756
Loans and Leases Receivable, Gross, Consumer, Installment, Other	3,222,762	3,162,493	2,784,407
Loans and Leases Receivable, Gross, Consumer, Home Equity	1,417,232	1,417,330	1,324,939
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	160,766	164,478	147,917
Loans and Leases Receivable, Gross, Consumer, Lease Financing	388,873	370,179	257,509
FDIC Indemnification Asset	20,005	22,033	54,748
Loans and Leases Receivable, Gross, Carrying Amount, Covered		312,659
Loans and Leases Receivable, Gross	15,490,889	15,326,147	14,608,613
Allowance for loan losses	-146,552	-143,649	-145,060
Net loans	15,344,337	15,182,498	14,463,553
Originated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	8,031,892	7,830,085	7,083,192
Loans and Leases Receivable, Gross, Consumer, Mortgage	639,980	625,283	555,971
Loans and Leases Receivable, Gross, Consumer, Installment, Other	2,500,288	2,393,451	1,835,522
Loans and Leases Receivable, Gross, Consumer, Home Equity	1,134,238	1,110,336	946,802
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card	160,766	164,478	147,917
Loans and Leases Receivable, Gross, Consumer, Lease Financing	388,873	370,179	257,509
Loans and Leases Receivable, Gross	12,856,037	12,493,812	10,826,913
Allowance for loan losses	-97,545	-95,696	-92,116
Net loans	12,758,492	12,398,116	10,734,797
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	1,011,170	1,086,899	1,562,878
Loans and Leases Receivable, Gross, Consumer, Mortgage	378,192	394,484	446,374
Loans and Leases Receivable, Gross, Consumer, Installment, Other	717,693	764,168	943,354
Loans and Leases Receivable, Gross, Consumer, Home Equity	217,824	233,629	283,309
Loans and Leases Receivable, Gross	2,324,879	2,479,180	3,235,915
Allowance for loan losses	-7,493	-7,457	-2,974
Net loans	2,317,386	2,471,723	3,232,941
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	179,547	211,607	341,267
Loans and Leases Receivable, Gross, Consumer, Mortgage	40,470	41,276	49,411
Loans and Leases Receivable, Gross, Consumer, Installment, Other	4,781	4,874	5,531
Loans and Leases Receivable, Gross, Consumer, Home Equity	65,170	73,365	94,828
FDIC Indemnification Asset	20,005	22,033	54,748
Loans and Leases Receivable, Gross, Carrying Amount, Covered	309,973	353,155	545,785
Loans and Leases Receivable, Allowance, Covered	-41,514	-40,496	-49,970
Loans and Leases Receivable, Net Reported Amount, Covered	$268,459	$312,659	$495,815

Loans_Schedule_of_Acquired_Imp

Loans (Schedule of Acquired Impaired Loans, Accretable Yield and Carrying Amount) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Covered impaired loan
Accretable Yield
Balance at beginning of period	$37,511	$67,282
Accretion	-5,567	-12,616
Net reclassifications from nonaccretable to accretable	-56	6,057
Disposals	-2,021	2,280
Balance at end of period	29,867	63,003
Carrying Amount of Loans
Balance at beginning of period	232,452	403,692
Accretion	5,567	12,616
Payments received, net	-38,794	-51,820
Balance at end of period	199,225	364,488
Acquired Impaired Loans
Accretable Yield
Balance at beginning of period	119,450	136,646
Accretion	-11,218	11,741
Net reclassifications from nonaccretable to accretable	12,995	19,514
Disposals	-2,471	2,135
Balance at end of period	118,756	142,284
Carrying Amount of Loans
Balance at beginning of period	423,209	601,000
Accretion	11,218	11,741
Payments received, net	-46,114	55,542
Balance at end of period	$388,313	$557,199

Loans_Covered_Loan_Loss_Share_

Loans (Covered Loan Loss Share Receivable) (Details) (Loss Share Receivable, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Loss Share Receivable Rollforward [Roll Forward]
Balance at beginning of period	$22,033	$61,827
Amortization	-2,187	-5,863
Increase/(decrease) due to impairment (recapture) on FDIC acquired loans	4,227	4,824
FDIC reimbursement	-4,013	-5,087
FDIC acquired loans paid in full	-55	-953
Balance at end of the period (1)	20,005	54,748
Single Family Loss Share Agreement
Loss Share Receivable Rollforward [Roll Forward]
Balance at end of the period (1)	-13,752
Non-Single Family Loss Share Agreement
Loss Share Receivable Rollforward [Roll Forward]
Balance at end of the period (1)	($6,253)

Loans_Schedules_of_Past_Due_Re

Loans (Schedules of Past Due Receivables) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Consumer Loans Guaranteed by Government	$2,400,000	$2,400,000	$2,300,000
FDIC Indemnification Asset	20,005,000	22,033,000	54,748,000
Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
FDIC Indemnification Asset	20,005,000	22,033,000	54,748,000
Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	9,233,000	7,915,000	12,466,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	6,199,000	2,478,000	1,422,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	62,830,000	66,803,000	133,765,000
Financing Receivable, Recorded Investment, Past Due	78,262,000	77,196,000	147,653,000
Financing Receivable, Recorded Investment, Current	211,706,000	253,926,000	343,384,000
Financing Receivable, Net	289,968,000	331,122,000	491,037,000
Covered Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	6,906,000	6,064,000
Financing Receivable, Recorded Investment, Past Due	6,906,000	6,064,000
Financing Receivable, Recorded Investment, Current	1,919,000	3,198,000
Financing Receivable, Net	8,825,000	9,262,000	20,421,000
Covered Loans | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	815,000	58,000	1,744,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	144,000	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,566,000	6,041,000	11,867,000
Financing Receivable, Recorded Investment, Past Due	5,525,000	6,099,000	13,611,000
Financing Receivable, Recorded Investment, Current	37,289,000	42,738,000	51,641,000
Financing Receivable, Net	42,814,000	48,837,000	65,252,000
Covered Loans | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	413,000	234,000	582,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	5,218,000	1,517,000	449,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	44,023,000	47,233,000	97,596,000
Financing Receivable, Recorded Investment, Past Due	49,654,000	48,984,000	98,627,000
Financing Receivable, Recorded Investment, Current	78,254,000	104,524,000	156,966,000
Financing Receivable, Net	127,908,000	153,508,000	255,593,000
Covered Loans | Commercial Construction Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due			1,008,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due			0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due			16,337,000
Financing Receivable, Recorded Investment, Past Due			17,345,000
Financing Receivable, Recorded Investment, Current			3,076,000
Financing Receivable, Net			20,421,000
Covered Loans | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	23,000	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	110,000	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	34,000	0
Financing Receivable, Recorded Investment, Past Due	110,000	57,000	0
Financing Receivable, Recorded Investment, Current	4,671,000	4,817,000	5,531,000
Financing Receivable, Net	4,781,000	4,874,000	5,531,000
Covered Loans | Consumer Home Equity Lines Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,291,000	1,395,000	758,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	564,000	870,000	538,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,651,000	3,859,000	2,093,000
Financing Receivable, Recorded Investment, Past Due	6,506,000	6,124,000	3,389,000
Financing Receivable, Recorded Investment, Current	58,664,000	67,241,000	91,439,000
Financing Receivable, Net	65,170,000	73,365,000	94,828,000
Covered Loans | Consumer Residential Mortgages Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	5,714,000	6,205,000	8,374,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	163,000	91,000	435,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,684,000	3,572,000	5,872,000
Financing Receivable, Recorded Investment, Past Due	9,561,000	9,868,000	14,681,000
Financing Receivable, Recorded Investment, Current	30,909,000	31,408,000	34,731,000
Financing Receivable, Net	40,470,000	41,276,000	49,412,000
Originated Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	27,845,000	33,099,000	39,227,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	8,046,000	10,116,000	9,628,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	22,918,000	26,329,000	27,237,000
Financing Receivable, Recorded Investment, Past Due	58,809,000	69,544,000	76,092,000
Financing Receivable, Recorded Investment, Current	12,797,228,000	12,424,268,000	10,750,821,000
Financing Receivable, Net	12,856,037,000	12,493,812,000	10,826,913,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	7,914,000	12,156,000	11,860,000
Financing Receivable, Recorded Investment, Nonaccrual Status	46,085,000	34,617,000	43,448,000
Originated Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivable, Recorded Investment, Current	580,978,000
Financing Receivable, Net	580,978,000	537,766,000	359,751,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0
Originated Loans | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	525,000	2,212,000	4,088,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	515,000	1,162,000	561,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	5,846,000	2,670,000	5,546,000
Financing Receivable, Recorded Investment, Past Due	6,886,000	6,044,000	10,195,000
Financing Receivable, Recorded Investment, Current	5,311,011,000	5,169,157,000	4,465,961,000
Financing Receivable, Net	5,317,897,000	5,175,201,000	4,476,156,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	498,000	1,547,000	2,000,000
Financing Receivable, Recorded Investment, Nonaccrual Status	18,838,000	6,114,000	6,388,000
Originated Loans | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	4,401,000	2,155,000	13,549,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,177,000	1,460,000	3,644,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	3,481,000	8,864,000	7,999,000
Financing Receivable, Recorded Investment, Past Due	9,059,000	12,479,000	25,192,000
Financing Receivable, Recorded Investment, Current	2,123,958,000	2,104,639,000	2,222,093,000
Financing Receivable, Net	2,133,017,000	2,117,118,000	2,247,285,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	150,000	1,696,000	804,000
Financing Receivable, Recorded Investment, Nonaccrual Status	9,640,000	11,033,000	20,679,000
Originated Loans | Commercial Construction Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due		0	369,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due		0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		0	0
Financing Receivable, Recorded Investment, Past Due		0	369,000
Financing Receivable, Recorded Investment, Current		537,766,000	359,382,000
Financing Receivable, Net		537,766,000	359,751,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		0	0
Financing Receivable, Recorded Investment, Nonaccrual Status		0	55,000
Originated Loans | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	255,000	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0	0
Financing Receivable, Recorded Investment, Past Due	255,000	0	0
Financing Receivable, Recorded Investment, Current	388,618,000	370,179,000	257,509,000
Financing Receivable, Net	388,873,000	370,179,000	257,509,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0	0
Originated Loans | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	11,294,000	14,621,000	9,162,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	3,215,000	3,647,000	2,659,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	4,157,000	4,716,000	3,762,000
Financing Receivable, Recorded Investment, Past Due	18,666,000	22,984,000	15,583,000
Financing Receivable, Recorded Investment, Current	2,481,622,000	2,370,467,000	1,819,939,000
Financing Receivable, Net	2,500,288,000	2,393,451,000	1,835,522,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3,332,000	3,695,000	3,286,000
Financing Receivable, Recorded Investment, Nonaccrual Status	3,016,000	3,268,000	3,222,000
Originated Loans | Consumer Home Equity Lines Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,480,000	1,357,000	1,644,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	323,000	587,000	444,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,395,000	1,206,000	902,000
Financing Receivable, Recorded Investment, Past Due	3,198,000	3,150,000	2,990,000
Financing Receivable, Recorded Investment, Current	1,131,040,000	1,107,186,000	943,812,000
Financing Receivable, Net	1,134,238,000	1,110,336,000	946,802,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	622,000	569,000	509,000
Financing Receivable, Recorded Investment, Nonaccrual Status	1,780,000	1,654,000	1,653,000
Originated Loans | Consumer Credit Card
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	654,000	668,000	783,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	301,000	516,000	438,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	637,000	860,000	573,000
Financing Receivable, Recorded Investment, Past Due	1,592,000	2,044,000	1,794,000
Financing Receivable, Recorded Investment, Current	159,174,000	162,434,000	146,123,000
Financing Receivable, Net	160,766,000	164,478,000	147,917,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	312,000	407,000	262,000
Financing Receivable, Recorded Investment, Nonaccrual Status	523,000	596,000	488,000
Originated Loans | Consumer Residential Mortgages Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	9,236,000	12,086,000	9,632,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2,515,000	2,744,000	1,882,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	7,402,000	8,013,000	8,455,000
Financing Receivable, Recorded Investment, Past Due	19,153,000	22,843,000	19,969,000
Financing Receivable, Recorded Investment, Current	620,827,000	602,440,000	536,002,000
Financing Receivable, Net	639,980,000	625,283,000	555,971,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3,000,000	4,242,000	4,999,000
Financing Receivable, Recorded Investment, Nonaccrual Status	12,288,000	11,952,000	10,963,000
Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	22,176,000	25,656,000	28,697,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	4,967,000	9,432,000	10,205,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	37,005,000	40,268,000	38,524,000
Financing Receivable, Recorded Investment, Past Due	64,148,000	75,356,000	77,426,000
Financing Receivable, Recorded Investment, Current	2,260,731,000	2,403,824,000	3,158,489,000
Financing Receivable, Net	2,324,879,000	2,479,180,000	3,235,915,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,704,000	3,471,000	1,949,000
Financing Receivable, Recorded Investment, Nonaccrual Status	7,254,000	8,056,000	4,673,000
Acquired Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Net	6,288,000	6,971,000	13,370,000
Acquired Loans | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	66,000	92,000	776,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	131,000	234,000	720,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	5,366,000	4,791,000	4,224,000
Financing Receivable, Recorded Investment, Past Due	5,563,000	5,117,000	5,720,000
Financing Receivable, Recorded Investment, Current	415,247,000	444,137,000	705,912,000
Financing Receivable, Net	420,810,000	449,254,000	711,632,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	44,000	0	170,000
Financing Receivable, Recorded Investment, Nonaccrual Status	700,000	787,000	241,000
Acquired Loans | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	4,507,000	3,479,000	5,356,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,380,000	3,398,000	3,639,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	23,420,000	23,509,000	21,995,000
Financing Receivable, Recorded Investment, Past Due	29,307,000	30,386,000	30,990,000
Financing Receivable, Recorded Investment, Current	554,765,000	600,288,000	806,886,000
Financing Receivable, Net	584,072,000	630,674,000	837,876,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	252,000	44,000	5,000
Financing Receivable, Recorded Investment, Nonaccrual Status	4,172,000	4,171,000	1,259,000
Acquired Loans | Commercial Construction Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0	650,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	676,000	685,000	0
Financing Receivable, Recorded Investment, Past Due	676,000	685,000	650,000
Financing Receivable, Recorded Investment, Current	5,612,000	6,286,000	12,720,000
Financing Receivable, Net	6,288,000	6,971,000	13,370,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0	0
Acquired Loans | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	4,859,000	6,204,000	7,216,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,322,000	2,029,000	2,563,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,121,000	1,861,000	1,619,000
Financing Receivable, Recorded Investment, Past Due	7,302,000	10,094,000	11,398,000
Financing Receivable, Recorded Investment, Current	710,391,000	754,074,000	931,956,000
Financing Receivable, Net	717,693,000	764,168,000	943,354,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	521,000	615,000	665,000
Financing Receivable, Recorded Investment, Nonaccrual Status	746,000	1,218,000	678,000
Acquired Loans | Consumer Home Equity Lines Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,850,000	2,819,000	3,606,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,544,000	2,123,000	811,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,172,000	2,333,000	3,596,000
Financing Receivable, Recorded Investment, Past Due	5,566,000	7,275,000	8,013,000
Financing Receivable, Recorded Investment, Current	212,258,000	226,354,000	275,296,000
Financing Receivable, Net	217,824,000	233,629,000	283,309,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	462,000	1,519,000	1,078,000
Financing Receivable, Recorded Investment, Nonaccrual Status	639,000	631,000	1,090,000
Acquired Loans | Consumer Residential Mortgages Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	9,894,000	13,062,000	11,743,000
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	590,000	1,648,000	1,822,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	5,250,000	7,089,000	7,090,000
Financing Receivable, Recorded Investment, Past Due	15,734,000	21,799,000	20,655,000
Financing Receivable, Recorded Investment, Current	362,458,000	372,685,000	425,719,000
Financing Receivable, Net	378,192,000	394,484,000	446,374,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	425,000	1,293,000	31,000
Financing Receivable, Recorded Investment, Nonaccrual Status	$997,000	$1,249,000	$1,405,000

Loans_Financing_Receivables_Cr

Loans (Financing Receivables Credit Quality Indicators) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Originated Loans
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$12,856,037	$12,493,812	$10,826,913
Originated Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,317,897	5,175,201	4,476,156
Originated Loans | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,133,017	2,117,118	2,247,285
Originated Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	580,978	537,766	359,751
Originated Loans | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	388,873	370,179	257,509
Originated Loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,420,765	8,200,264	7,340,701
Originated Loans | Grade One
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net			37,601
Originated Loans | Grade One | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	59,380	52,676	28,610
Originated Loans | Grade One | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	667	683	240
Originated Loans | Grade One | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	678	299
Originated Loans | Grade One | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	13,052	4,451	8,452
Originated Loans | Grade One | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	73,099	58,488
Originated Loans | Grade Two | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	191,008	186,278	135,574
Originated Loans | Grade Two | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,368	3,454	3,797
Originated Loans | Grade Two | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans | Grade Two | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,782	14,959	3,620
Originated Loans | Grade Two | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	200,158	204,691	142,991
Originated Loans | Grade Three | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,405,007	1,340,100	940,937
Originated Loans | Grade Three | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	339,027	294,281	329,377
Originated Loans | Grade Three | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	62,821	46,074	24,731
Originated Loans | Grade Three | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	69,686	71,908	58,397
Originated Loans | Grade Three | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,876,541	1,752,363	1,353,442
Originated Loans | Grade Four | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,504,600	3,413,446	3,276,975
Originated Loans | Grade Four | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,724,516	1,745,470	1,823,877
Originated Loans | Grade Four | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	516,852	490,757	332,227
Originated Loans | Grade Four | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	297,790	277,277	179,795
Originated Loans | Grade Four | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,043,758	5,926,950	5,612,874
Originated Loans | Grade Five | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	103,432	139,083	61,507
Originated Loans | Grade Five | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	29,034	29,990	39,245
Originated Loans | Grade Five | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	942	257	259
Originated Loans | Grade Five | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,307	1,389	6,857
Originated Loans | Grade Five | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	134,715	170,719	107,868
Originated Loans | Grade Six | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	54,470	43,618	32,553
Originated Loans | Grade Six | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	36,405	43,240	50,749
Originated Loans | Grade Six | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	363	0	2,235
Originated Loans | Grade Six | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,256	195	388
Originated Loans | Grade Six | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	92,494	87,053	85,925
Originated Loans | Grade Seven | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans | Grade Seven | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans | Grade Seven | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans | Grade Seven | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Originated Loans | Grade Seven | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,324,879	2,479,180	3,235,915
Acquired Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	420,810	449,254	711,632
Acquired Loans | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	584,072	630,674	837,876
Acquired Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	6,288	6,971	13,370
Acquired Loans | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,011,170	1,086,899	1,562,878
Acquired Loans | Grade One | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,069	1,076	700
Acquired Loans | Grade One | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade One | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade One | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade One | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,069	1,076	700
Acquired Loans | Grade Two | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Two | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Two | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Two | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Two | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Three | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	22,875	20,891	37,829
Acquired Loans | Grade Three | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	24,834	24,867	24,177
Acquired Loans | Grade Three | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Three | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Three | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	47,709	45,758	62,006
Acquired Loans | Grade Four | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	359,751	376,129	609,383
Acquired Loans | Grade Four | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	496,213	532,447	696,070
Acquired Loans | Grade Four | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,612	6,286	13,370
Acquired Loans | Grade Four | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Four | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	861,576	914,862	1,318,823
Acquired Loans | Grade Five | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	15,363	23,268	43,721
Acquired Loans | Grade Five | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	21,487	28,382	51,253
Acquired Loans | Grade Five | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	685	0
Acquired Loans | Grade Five | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Five | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	36,850	52,335	94,974
Acquired Loans | Grade Six | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	21,752	27,890	19,999
Acquired Loans | Grade Six | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	41,538	44,978	66,376
Acquired Loans | Grade Six | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	676	0	0
Acquired Loans | Grade Six | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Six | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	63,966	72,868	86,375
Acquired Loans | Grade Seven | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Seven | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Seven | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Seven | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Acquired Loans | Grade Seven | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	289,968	331,122	491,037
Covered Loans | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	42,814	48,837	65,252
Covered Loans | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	127,908	153,508	255,593
Covered Loans | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,825	9,262	20,421
Covered Loans | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	179,547	211,607	341,266
Covered Loans | Grade One | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade One | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade One | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade One | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade One | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Two | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,040	1,347	957
Covered Loans | Grade Two | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Two | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Two | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Two | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,040	1,347	957
Covered Loans | Grade Three | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Three | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Three | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Three | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Three | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Four | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	33,352	36,406	42,228
Covered Loans | Grade Four | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	74,128	86,779	111,610
Covered Loans | Grade Four | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	579	823	653
Covered Loans | Grade Four | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Four | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	108,059	124,008	154,491
Covered Loans | Grade Five | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	39	167	387
Covered Loans | Grade Five | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,134	3,401	2,883
Covered Loans | Grade Five | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Five | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Five | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,173	3,568	3,270
Covered Loans | Grade Six | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,383	10,917	19,864
Covered Loans | Grade Six | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	51,646	63,328	140,927
Covered Loans | Grade Six | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,246	8,248	19,459
Covered Loans | Grade Six | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Six | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	68,275	82,493	180,250
Covered Loans | Grade Seven | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	1,816
Covered Loans | Grade Seven | Commercial Real Estate Other Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	173
Covered Loans | Grade Seven | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	191	309
Covered Loans | Grade Seven | Commercial Leases Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Covered Loans | Grade Seven | Commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$0	$191	$2,298

Loans_Narrative_Details

Loans (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered			$312,659,000
Loans and Leases Receivable, Gross, Commercial	9,222,609,000	8,987,337,000	9,128,591,000
Time period for non-payment of loans that are placed on non-accrual status	90 days
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	4,600,000	7,100,000	5,400,000
Days past due for nonaccrual status credit card loans	120 days
Acquired Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net reclassifications from nonaccretable to accretable	12,995,000	19,514,000
Covered impaired loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	404,400,000	702,400,000
Non-Covered Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	5,000,000
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	1,011,170,000	1,562,878,000	1,086,899,000
Non-Single Family Loss Share Agreement | Covered impaired loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Commercial	174,600,000
Single Family Loss Share Agreement | Covered impaired loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Consumer	110,400,000
Covered impaired loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net reclassifications from nonaccretable to accretable	-56,000	6,057,000
Impaired loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$548,200,000	$774,500,000

Allowance_for_Loan_Losses_Sche

Allowance for Loan Losses Schedule of Credit Losses Related to Originated Financing Receivables, Current (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$2,200
Provision for Loan, Lease, and Other Losses	8,248		14,536
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	97,545		92,116		95,696		96,484
Financing Receivable, Allowance for Credit Losses, Write-downs	-8,567		-13,160
Financing Receivable, Allowance for Credit Losses, Recovery	4,380		5,138
Provision for Loan, Lease, and Other Losses	-6,036		-3,654
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	13,297		8,561		5,950
Impaired Financing Receivable, Related Allowance	13,297	[1]	8,561	[1]	5,950	[1]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	84,248		83,555		89,746
Financing Receivable, Individually Evaluated for Impairment	110,943		99,104		93,448
Financing Receivable, Collectively Evaluated for Impairment	12,745,094		10,727,809		12,400,364
Financing Receivable, Net	12,856,037		10,826,913		12,493,812
Originated Loans | Commercial Portfolio Segmen
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	39,838		40,175		37,375		42,981
Financing Receivable, Allowance for Credit Losses, Write-downs			-5,074
Financing Receivable, Allowance for Credit Losses, Recovery			997
Provision for Loan, Lease, and Other Losses			-1,271
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	10,042		2,866		72
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	29,796		37,309		37,303
Financing Receivable, Individually Evaluated for Impairment	35,792		7,143		11,759
Financing Receivable, Collectively Evaluated for Impairment	5,282,105		4,469,013		5,163,442
Financing Receivable, Net	5,317,897		4,476,156		5,175,201
Originated Loans | Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	8,813		13,385		10,492		12,265
Financing Receivable, Allowance for Credit Losses, Write-downs	-215		-79
Financing Receivable, Allowance for Credit Losses, Recovery	0		4
Provision for Loan, Lease, and Other Losses	1,464		-1,195
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	317		2,918		2,914
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8,496		10,467		7,578
Financing Receivable, Individually Evaluated for Impairment	15,000		31,576		23,300
Financing Receivable, Collectively Evaluated for Impairment	2,118,017		2,215,709		2,093,818
Financing Receivable, Net	2,133,017		2,247,285		2,117,118
Originated Loans | Commercial Construction Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	1,752		1,470		2,202		2,810
Financing Receivable, Allowance for Credit Losses, Write-downs	0		0
Financing Receivable, Allowance for Credit Losses, Recovery	1		28
Provision for Loan, Lease, and Other Losses	451		1,368
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,752		1,470		2,202
Financing Receivable, Individually Evaluated for Impairment	0		404		0
Financing Receivable, Collectively Evaluated for Impairment	580,978		359,347		537,766
Financing Receivable, Net	580,978		359,751		537,766
Originated Loans | Finance Leases Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	629		1,027		674		1,081
Financing Receivable, Allowance for Credit Losses, Write-downs	0		0
Financing Receivable, Allowance for Credit Losses, Recovery	4		0
Provision for Loan, Lease, and Other Losses	49		54
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	629		1,027		674
Financing Receivable, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Collectively Evaluated for Impairment	388,873		257,509		370,179
Financing Receivable, Net	388,873		257,509		370,179
Originated Loans | Installment Financing Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	13,358		11,604		12,918		11,935
Financing Receivable, Allowance for Credit Losses, Write-downs	-5,055		-4,584
Financing Receivable, Allowance for Credit Losses, Recovery	3,020		2,749
Provision for Loan, Lease, and Other Losses	-2,475		-1,504
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,006		1,178
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	12,353		10,598		11,740
Financing Receivable, Individually Evaluated for Impairment	26,882		25,818		24,905
Financing Receivable, Collectively Evaluated for Impairment	2,473,406		1,809,704		2,368,546
Financing Receivable, Net	2,500,288		1,835,522		2,393,451
Originated Loans | Home Equity Receivable Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	19,433		13,160		19,324		12,900
Financing Receivable, Allowance for Credit Losses, Write-downs	-911		-1,409
Financing Receivable, Allowance for Credit Losses, Recovery	613		904
Provision for Loan, Lease, and Other Losses	-407		-765
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			223		207
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	19,179		12,937		19,117
Financing Receivable, Individually Evaluated for Impairment	7,632		6,931		7,379
Financing Receivable, Collectively Evaluated for Impairment	1,126,606		939,871		1,102,957
Financing Receivable, Net	1,134,238		946,802		1,110,336
Originated Loans | Credit Card Receivables Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	7,801		6,851		7,966		7,740
Financing Receivable, Allowance for Credit Losses, Write-downs	-1,452		-1,455
Financing Receivable, Allowance for Credit Losses, Recovery	366		418
Provision for Loan, Lease, and Other Losses	-921		-148
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			307		296
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,538		6,544		7,670
Financing Receivable, Individually Evaluated for Impairment	815		1,034		854
Financing Receivable, Collectively Evaluated for Impairment	159,951		146,883		163,624
Financing Receivable, Net	160,766		147,917		164,478
Originated Loans | Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	5,921		4,444		4,745		4,772
Financing Receivable, Allowance for Credit Losses, Write-downs	-424		-559
Financing Receivable, Allowance for Credit Losses, Recovery	35		38
Provision for Loan, Lease, and Other Losses	-1,565		-193
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,241	[1]	1,283	[1]
Impaired Financing Receivable, Related Allowance	1,416	[1]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,505		3,203		3,462
Financing Receivable, Individually Evaluated for Impairment	24,822		26,198		25,251
Financing Receivable, Collectively Evaluated for Impairment	615,158		529,773		600,032
Financing Receivable, Net	639,980		555,971		625,283
Originated Loans | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	-510
Financing Receivable, Allowance for Credit Losses, Recovery	341
Provision for Loan, Lease, and Other Losses	-2,632
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			2,866	[1]	72	[1]
Financing Receivable, Net	5,317,897		4,476,156		5,175,201
Total Tdr Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Related Allowance	5,661		9,074		6,645
Total Tdr Allowance | Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Related Allowance	3,133		5,079		3,195
Total Tdr Allowance | Consumer Residential Mortgages Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Related Allowance	1,416		1,241
Total Tdr Allowance | Consumer Installment
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Related Allowance	$1,053		$1,006		$1,243
[1]	Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.

Allowance_for_Loan_Losses_Sche1

Allowance for Loan Losses Schedule of Credit Losses Related to Acquired Financing Receivables, Current (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
allowance for acquired impaired loan losses [Line Items]
Provision for Loan and Lease Losses	$8,248	$14,536
Acquired Loans
allowance for acquired impaired loan losses [Line Items]
Provision for Loan and Lease Losses	36	2,233
Financing Receivable, Allowance for Credit Losses	7,493	2,974	7,457	741
Allowance for Loan and Lease Losses, Write-offs	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	$0	$0

Allowance_for_Loan_Losses_Sche2

Allowance for Loan Losses Schedule of Credit Losses Related to Covered Financing Receivables, Current Period (Details) (Covered Loans, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	$40,496	$44,027
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	4,225	7,879
Benefit Attributable to FDIC Loss Share Agreements	-4,227	-4,824
Provision for Loan Lease and Other Losses Covered	-2	3,055
Increase in Indemnification Asset	4,227	4,824
Allowance for Loan and Lease Losses, Write-offs	-3,207	-1,936
Balance at end of the period	$41,514	$49,970

Allowance_for_Loan_Losses_Impa

Allowance for Loan Losses Impaired Financing Receivables (Details) (Originated Loans, USD $)	3 Months Ended				12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$13,297		$8,561		$5,950
Impaired Financing Receivable, Recorded Investment	110,943	[1]	99,104	[1]	93,448	[1]
Impaired Financing Receivable, Unpaid Principal Balance	127,631	[1]	110,999	[1]	110,055	[1]
Impaired Financing Receivable, Related Allowance	13,297	[1]	8,561	[1]	5,950	[1]
Impaired Financing Receivable, Average Recorded Investment	105,804	[1]	105,464	[1]	95,108	[1]
Residential Portfolio Segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	12,424	[1]	12,137	[1]	12,204	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,125	[1]	14,845	[1]	15,119	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,241	[1]	1,283	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,414	[1]	14,067	[1]	13,121	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,488	[1]	12,201	[1]	12,425	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,398	[1]	14,061	[1]	13,047	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,487	[1]	14,161	[1]	13,158	[1]
Impaired Financing Receivable, Related Allowance	1,416	[1]
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	28,513	[1]	2,776	[1]	11,451	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	35,307	[1]	5,078	[1]	18,207	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			2,866	[1]	72	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,984	[1]	7,406	[1]	326	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	25,006	[1]	4,690	[1]	14,193	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,279	[1]	4,367	[1]	308	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,350	[1]	9,022	[1]	344	[1]
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,343	[1]	21,777	[1]	16,874	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,478	[1]	20,050	[1]	22,696	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			2,918	[1]	2,914	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,668	[1]	9,864	[1]	4,497	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,634	[1]	20,196	[1]	18,027	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,657	[1]	9,799	[1]	6,426	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,664	[1]	9,878	[1]	6,440	[1]
Commercial Real Estate Construction Financing Receivable
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[1]	404	[1]	0	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	[1]	2,777	[1]	0	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	[1]	2,943	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	[1]	0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	[1]	0	[1]	0	[1]
Installment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,846	[1]	2,498	[1]	4,460	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,428	[1]	3,502	[1]	4,584	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			1,006	[1]	1,178	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	24,181	[1]	23,548	[1]	19,513	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,881	[1]	2,579	[1]	4,272	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	25,036	[1]	23,320	[1]	20,445	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	25,100	[1]	23,409	[1]	21,024	[1]
Home equity lines
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	977	[1]	997	[1]	1,723	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,222	[1]	1,309	[1]	1,754	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			223	[1]	207	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,715	[1]	5,891	[1]	5,944	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	987	[1]	1,004	[1]	1,792	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,655	[1]	5,934	[1]	5,656	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,655	[1]	5,934	[1]	5,875	[1]
Consumer Credit Card
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	21	[1]	42	[1]	16	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	21	[1]	42	[1]	16	[1]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment			307	[1]	296	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	823	[1]	1,025	[1]	966	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	23	[1]	50	[1]	32	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	794	[1]	992	[1]	838	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	794	[1]	992	[1]	838	[1]
Total impaired loans with no related allowance
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	53,124	[1]	40,631	[1]	46,728	[1]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	69,581	[1]	47,603	[1]	62,376	[1]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	50,019	[1]	43,663	[1]	50,741	[1]
Total impaired loans with a related allowance [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	13,297	[1]	8,561	[1]	5,950	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	55,785	[1]	61,801	[1]	44,367	[1]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	57,819	[1]	58,473	[1]	46,720	[1]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	$58,050	[1]	$63,396	[1]	$47,679	[1]
[1]	Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.

Allowance_for_Loan_Losses_Trou

Allowance for Loan Losses Troubled Debt Restructuring on Financing Receivables (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income	$900,000		$800,000
Financing Receivable, Modifications, Recorded Investment	135,631,000		139,736,000		130,458,000
Financing Receiables, Modifications, Unpaid Principal Balance	178,117,000		188,598,000		173,976,000
financing receivables, modifications, number of contracts at period end	2,509		2,574		2,494
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,925,000	[1]	6,270,000	[1]	7,318,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	25,024,000	[1]	14,783,000	[1]	15,495,000	[1]
financing receivables, modifications, number of contracts at period end	56		45		51
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	38,424,000	[1]	58,066,000	[1]	45,648,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	59,556,000	[1]	75,251,000	[1]	67,466,000	[1]
financing receivables, modifications, number of contracts at period end	91		83		94
Commercial Real Estate Construction Financing Receivable
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	346,000	[1]	5,329,000	[1]	339,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	9,552,000	[1]	24,117,000	[1]	9,552,000	[1]
financing receivables, modifications, number of contracts at period end	40		42		40
Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	55,695,000	[1]	69,665,000	[1]	53,305,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	94,132,000	[1]	114,151,000	[1]	92,513,000	[1]
financing receivables, modifications, number of contracts at period end	187		170		185
Installment
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,077,000	[1]	26,615,000	[1]	25,880,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	28,809,000	[1]	27,739,000	[1]	26,662,000	[1]
financing receivables, modifications, number of contracts at period end	1,237		1,457		1,245
Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,851,000	[1]	15,126,000	[1]	23,201,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	24,161,000	[1]	15,465,000	[1]	23,513,000	[1]
financing receivables, modifications, number of contracts at period end	508		336		483
Consumer Credit Card
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	815,000	[1]	1,034,000		854,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	815,000	[1]	1,034,000		854,000	[1]
financing receivables, modifications, number of contracts at period end	230		278		238
Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	27,193,000	[1]	27,296,000	[1]	27,218,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	30,200,000	[1]	30,209,000	[1]	30,434,000	[1]
financing receivables, modifications, number of contracts at period end	347		333		343
Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	79,936,000	[1]	70,071,000	[1]	77,153,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	83,985,000	[1]	74,447,000	[1]	81,463,000	[1]
financing receivables, modifications, number of contracts at period end	2,322		2,404		2,309
Originated Loans Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,923,000	[1]	5,588,000	[1]	7,123,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	23,666,000	[1]	12,546,000	[1]	13,887,000	[1]
financing receivables, modifications, number of contracts at period end	47		40		41
Originated Loans Commercial | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,076,000	[1]	16,432,000	[1]	17,607,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	17,325,000	[1]	17,079,000	[1]	22,645,000	[1]
financing receivables, modifications, number of contracts at period end	64		57		67
Originated Loans Commercial | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[1]	2,769,000	[1]	0	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	0	[1]	2,777,000	[1]	0	[1]
financing receivables, modifications, number of contracts at period end	31		32		31
Originated Loans Commercial | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,999,000	[1]	24,789,000	[1]	24,730,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	40,991,000	[1]	32,402,000	[1]	36,532,000	[1]
financing receivables, modifications, number of contracts at period end	142		129		139
Originated Consumer Loans | Installment
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,882,000	[1]	25,818,000	[1]	24,905,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	27,528,000	[1]	26,911,000	[1]	25,608,000	[1]
financing receivables, modifications, number of contracts at period end	1,186		1,434		1,205
Originated Consumer Loans | Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,632,000	[1]	6,931,000	[1]	7,379,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	7,877,000	[1]	7,243,000	[1]	7,629,000	[1]
financing receivables, modifications, number of contracts at period end	276		244		270
Originated Consumer Loans | Consumer Credit Card
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	815,000	[1]	1,034,000	[1]	854,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	815,000	[1]	1,034,000	[1]	854,000	[1]
financing receivables, modifications, number of contracts at period end	230		278		238
Originated Consumer Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,822,000	[1]	26,199,000	[1]	25,251,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	27,612,000	[1]	29,006,000	[1]	28,277,000	[1]
financing receivables, modifications, number of contracts at period end	316		320		315
Originated Consumer Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	60,151,000	[1]	59,982,000	[1]	58,389,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	63,832,000	[1]	64,194,000	[1]	62,368,000	[1]
financing receivables, modifications, number of contracts at period end	2,008		2,276		2,028
Originated Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	89,150,000	[1]	84,771,000	[1]	83,119,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	104,823,000	[1]	96,596,000	[1]	98,900,000	[1]
financing receivables, modifications, number of contracts at period end	2,150		2,405		2,167
Acquired Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,146,000	[1]	5,181,000	[1]	12,100,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	13,692,000	[1]	5,337,000	[1]	12,474,000	[1]
financing receivables, modifications, number of contracts at period end	247		76		216
Acquired Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,000		5,000		18,000
Financing Receiables, Modifications, Unpaid Principal Balance	3,000		5,000		19,000
financing receivables, modifications, number of contracts at period end	1		1		2
Acquired Loans | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,453,000	[1]	1,695,000	[1]	2,542,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	2,635,000	[1]	1,687,000	[1]	2,595,000	[1]
financing receivables, modifications, number of contracts at period end	3		1		3
Acquired Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			1,700,000	[1]	2,560,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance			1,692,000	[1]	2,614,000	[1]
financing receivables, modifications, number of contracts at period end			2		5
Acquired Loans | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,455,000		1,700,000		2,560,000
Financing Receiables, Modifications, Unpaid Principal Balance	2,638,000
financing receivables, modifications, number of contracts at period end	4
Acquired Loans | installment
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,195,000		797,000		975,000
Financing Receiables, Modifications, Unpaid Principal Balance	1,281,000		828,000		1,054,000
financing receivables, modifications, number of contracts at period end	51		23		40
Acquired Loans | Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,310,000	[1]	1,926,000	[1]	6,932,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	7,370,000	[1]	1,953,000	[1]	6,983,000	[1]
financing receivables, modifications, number of contracts at period end	162		40		145
Acquired Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,186,000		758,000	[1]	1,633,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	2,403,000		864,000	[1]	1,823,000	[1]
financing receivables, modifications, number of contracts at period end	30		11		26
Acquired Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,691,000	[1]	3,481,000		9,540,000
Financing Receiables, Modifications, Unpaid Principal Balance	11,054,000	[1]	3,645,000		9,860,000
financing receivables, modifications, number of contracts at period end	243		74		211
Covered Loans Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[1]	677,000	[1]	177,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	1,355,000	[1]	2,232,000	[1]	1,589,000	[1]
financing receivables, modifications, number of contracts at period end	8		4		8
Covered Loans Commercial | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,895,000	[1]	39,939,000	[1]	25,499,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	39,596,000	[1]	56,485,000	[1]	42,226,000	[1]
financing receivables, modifications, number of contracts at period end	24		25		24
Covered Loans Commercial | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	346,000	[1]	2,560,000	[1]	339,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	9,552,000	[1]	21,340,000	[1]	9,552,000	[1]
financing receivables, modifications, number of contracts at period end	9		10		9
Covered Loans Commercial | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,241,000	[1]	43,176,000	[1]	26,015,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	50,503,000	[1]	80,057,000	[1]	53,367,000	[1]
financing receivables, modifications, number of contracts at period end	41		39		41
Covered Consumer Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,094,000		6,608,000		9,224,000
Covered Consumer Loans | Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,909,000	[1]	6,269,000	[1]	8,890,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	8,914,000	[1]	6,269,000	[1]	8,901,000	[1]
financing receivables, modifications, number of contracts at period end	70		52		68
Covered Consumer Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	185,000	[1]	339,000		334,000
Financing Receiables, Modifications, Unpaid Principal Balance	185,000	[1]
financing receivables, modifications, number of contracts at period end	1
Covered Consumer Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			6,608,000
Financing Receiables, Modifications, Unpaid Principal Balance			6,608,000
financing receivables, modifications, number of contracts at period end			54
Covered TDR Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	33,335,000	[1]	49,784,000	[1]	35,239,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	59,602,000	[1]	86,665,000	[1]	62,602,000	[1]
financing receivables, modifications, number of contracts at period end	112		93		111
Covered TDR Loans | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			43,176,000
Covered TDR Loans | Residential Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			339,000
Financing Receiables, Modifications, Unpaid Principal Balance			339,000
financing receivables, modifications, number of contracts at period end			2
Covered TDR Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment					334,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance					334,000	[1]
financing receivables, modifications, number of contracts at period end					2
Covered TDR Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,094,000	[1]			9,224,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	$9,099,000	[1]			$9,235,000	[1]
financing receivables, modifications, number of contracts at period end	71				70
[1]	Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.

Allowance_for_Loan_Losses_Accr

Allowance for Loan Losses Accruing and Non-Accruing Troubled Debt Restructurings (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
In Thousands, unless otherwise specified
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	$135,631		$130,458		$139,736
Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	12,797,228		12,424,268		10,750,821
Financing Receivable, Recorded Investment, Past Due	58,809		69,544		76,092
Financing Receivable, Modifications, Recorded Investment	89,150	[1]	83,119	[1]	84,771	[1]
Impaired Financing Receivable, Related Allowance	13,297	[2]	5,950	[2]	8,561	[2]
Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	2,260,731		2,403,824		3,158,489
Financing Receivable, Recorded Investment, Past Due	64,148		75,356		77,426
Financing Receivable, Modifications, Recorded Investment	13,146	[1]	12,100	[1]	5,181	[1]
Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,094		9,224		6,608
Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	33,335	[1]	35,239	[1]	49,784	[1]
Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			84,600		74,034
Financing Receivable, Recorded Investment, Past Due			26,792		43,705
Financing Receivable, Modifications, Recorded Investment			111,392		117,739
Accruing TDRs | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	68,990		62,333		57,403
Financing Receivable, Recorded Investment, Past Due	4,378		5,545		5,835
Financing Receivable, Modifications, Recorded Investment	73,368		67,878		63,238
Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	9,084		7,910		4,482
Financing Receivable, Recorded Investment, Past Due	597		694		571
Financing Receivable, Modifications, Recorded Investment	9,681		8,604		5,053
Accruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,888		8,895		6,132
Financing Receivable, Recorded Investment, Past Due	939		0		140
Financing Receivable, Modifications, Recorded Investment	8,827		8,895		6,272
Accruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,888		14,357		12,149
Financing Receivable, Recorded Investment, Past Due	25,180		20,553		37,299
Financing Receivable, Modifications, Recorded Investment	33,068		34,910		49,448
Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			9,892		11,702
Financing Receivable, Recorded Investment, Past Due			9,174		10,295
Financing Receivable, Modifications, Recorded Investment			19,066		21,997
Nonaccruing TDRs | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	11,083		7,949		11,251
Financing Receivable, Recorded Investment, Past Due	4,699		7,292		10,282
Financing Receivable, Modifications, Recorded Investment	15,782		15,241		21,533
Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,731		1,614		115
Financing Receivable, Recorded Investment, Past Due	1,734		1,882		13
Financing Receivable, Modifications, Recorded Investment	3,465		3,496		128
Nonaccruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	267		329		336
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	267		329		336
Nonaccruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	267		329		336
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	267		329		336
Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	5,661		6,645		9,074
Total Tdr Allowance | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	3,133		3,195		5,079
Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	185		228		0
Total Tdr Allowance | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	24		48		0
Total Tdr Allowance | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,343		3,222		3,995
Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,925	[1]	7,318	[1]	6,270	[1]
Commercial | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	16,923	[1]	7,123	[1]	5,588	[1]
Commercial | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2		18		5
Commercial | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[1]	177	[1]	677	[1]
Commercial | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0		177		677
Commercial | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	16,558		6,755		2,079
Financing Receivable, Recorded Investment, Past Due	0		177		377
Financing Receivable, Modifications, Recorded Investment	16,558		6,932		2,456
Commercial | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	16,558		6,740		1,779
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	16,558		6,740		1,779
Commercial | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		15		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		15		0
Commercial | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		300
Financing Receivable, Recorded Investment, Past Due	0		177		377
Financing Receivable, Modifications, Recorded Investment	0		177		677
Commercial | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	2		3		546
Financing Receivable, Recorded Investment, Past Due	365		383		3,268
Financing Receivable, Modifications, Recorded Investment	367		386		3,814
Commercial | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		541
Financing Receivable, Recorded Investment, Past Due	365		383		3,268
Financing Receivable, Modifications, Recorded Investment	365		383		3,809
Commercial | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	2		3		5
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	2		3		5
Commercial | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		0
Commercial | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	126		90		2,277
Commercial | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	124		72		2,265
Commercial | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2		18		0
Commercial | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0		0		12
Commercial Real Estate
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	38,424	[1]	45,648	[1]	58,066	[1]
Commercial Real Estate | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	12,076	[1]	17,607	[1]	16,432	[1]
Commercial Real Estate | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,453	[1]	2,542	[1]	1,695	[1]
Commercial Real Estate | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,895	[1]	25,499	[1]	39,939	[1]
Commercial Real Estate | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,895		25,499		39,939
Commercial Real Estate | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			18,008		15,984
Financing Receivable, Recorded Investment, Past Due			21,328		36,788
Financing Receivable, Modifications, Recorded Investment			39,336		52,772
Commercial Real Estate | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	6,031		12,885		9,254
Financing Receivable, Recorded Investment, Past Due	1,493		952		1,884
Financing Receivable, Modifications, Recorded Investment	7,524		13,837		11,138
Commercial Real Estate | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		1,695
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		1,695
Commercial Real Estate | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		5,123		5,035
Financing Receivable, Recorded Investment, Past Due	23,895		20,376		34,904
Financing Receivable, Modifications, Recorded Investment	23,895		25,499		39,939
Commercial Real Estate | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			1,372		2,124
Financing Receivable, Recorded Investment, Past Due			4,940		3,170
Financing Receivable, Modifications, Recorded Investment			6,312		5,294
Commercial Real Estate | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	3,724		394		2,124
Financing Receivable, Recorded Investment, Past Due	828		3,376		3,170
Financing Receivable, Modifications, Recorded Investment	4,552		3,770		5,294
Commercial Real Estate | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	954		978		0
Financing Receivable, Recorded Investment, Past Due	1,499		1,564		0
Financing Receivable, Modifications, Recorded Investment	2,453		2,542		0
Commercial Real Estate | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		0
Commercial Real Estate | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,232		3,172		3,952
Commercial Real Estate | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	71		159		37
Commercial Real Estate | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	135		134		0
Commercial Real Estate | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,026		2,879		3,915
Commercial Real Estate Construction Financing Receivable
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	346	[1]	339	[1]	5,329	[1]
Commercial Real Estate Construction Financing Receivable | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[1]	0	[1]	2,769	[1]
Commercial Real Estate Construction Financing Receivable | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	346	[1]	339	[1]	2,560	[1]
Commercial Real Estate Construction Financing Receivable | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	346		339		2,560
Commercial Real Estate Construction Financing Receivable | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		339		3,045
Financing Receivable, Recorded Investment, Past Due	346		0		2,228
Financing Receivable, Modifications, Recorded Investment	346		339		5,273
Commercial Real Estate Construction Financing Receivable | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		2,363
Financing Receivable, Recorded Investment, Past Due	0		0		350
Financing Receivable, Modifications, Recorded Investment	0		0		2,713
Commercial Real Estate Construction Financing Receivable | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0
Financing Receivable, Recorded Investment, Past Due	0
Financing Receivable, Modifications, Recorded Investment	0
Commercial Real Estate Construction Financing Receivable | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		339		682
Financing Receivable, Recorded Investment, Past Due	346		0		1,878
Financing Receivable, Modifications, Recorded Investment	346		339		2,560
Commercial Real Estate Construction Financing Receivable | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		56
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		56
Commercial Real Estate Construction Financing Receivable | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		56
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		56
Commercial Real Estate Construction Financing Receivable | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	956
Financing Receivable, Recorded Investment, Past Due	1,499
Financing Receivable, Modifications, Recorded Investment	2,455
Commercial Real Estate Construction Financing Receivable | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		0
Commercial Real Estate Construction Financing Receivable | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	293		295		68
Commercial Real Estate Construction Financing Receivable | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0		0		0
Commercial Real Estate Construction Financing Receivable | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	293		295		68
Total commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	55,695	[1]	53,305	[1]	69,665	[1]
Total commercial | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,999	[1]	24,730	[1]	24,789	[1]
Total commercial | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,455		2,560		1,700
Total commercial | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,241	[1]	26,015	[1]	43,176	[1]
Total commercial | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,241		26,015
Total commercial | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment					43,176
Total commercial | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	22,589		25,102		21,108
Financing Receivable, Recorded Investment, Past Due	25,734		21,505		39,393
Financing Receivable, Modifications, Recorded Investment	48,323		46,607		60,501
Total commercial | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	22,589		19,625		13,396
Financing Receivable, Recorded Investment, Past Due	1,493		952		2,234
Financing Receivable, Modifications, Recorded Investment	24,082		20,577		15,630
Total commercial | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			15		1,695
Financing Receivable, Recorded Investment, Past Due			0		0
Financing Receivable, Modifications, Recorded Investment			15		1,695
Total commercial | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		5,462
Financing Receivable, Recorded Investment, Past Due	24,241		20,553
Financing Receivable, Modifications, Recorded Investment	24,241		26,015
Total commercial | Accruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current					6,017
Financing Receivable, Recorded Investment, Past Due					37,159
Financing Receivable, Modifications, Recorded Investment					43,176
Total commercial | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	4,680		1,375		2,726
Financing Receivable, Recorded Investment, Past Due	2,692		5,323		6,438
Financing Receivable, Modifications, Recorded Investment	7,372		6,698		9,164
Total commercial | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	3,724		394		2,721
Financing Receivable, Recorded Investment, Past Due	1,193		3,759		6,438
Financing Receivable, Modifications, Recorded Investment	4,917		4,153		9,159
Total commercial | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			981		5
Financing Receivable, Recorded Investment, Past Due			1,564		0
Financing Receivable, Modifications, Recorded Investment			2,545		5
Total commercial | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0
Financing Receivable, Recorded Investment, Past Due	0		0
Financing Receivable, Modifications, Recorded Investment	0		0
Total commercial | Nonaccruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current					0
Financing Receivable, Recorded Investment, Past Due					0
Financing Receivable, Modifications, Recorded Investment					0
Total commercial | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,651		3,557		6,297
Total commercial | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	195		231		2,302
Total commercial | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	137		152		0
Total commercial | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,319		3,174
Total commercial | Total Tdr Allowance | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance					3,995
Installment
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,077	[1]	25,880	[1]	26,615	[1]
Installment | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,882	[1]	24,905	[1]	25,818	[1]
Consumer Installment
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,077		25,880		26,615
Consumer Installment | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,882		24,905		25,818
Consumer Installment | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,195		975		797
Consumer Installment | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	25,840		23,095		23,464
Financing Receivable, Recorded Investment, Past Due	442		813		557
Financing Receivable, Modifications, Recorded Investment	26,282		23,908		24,021
Consumer Installment | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	24,701		22,254		22,757
Financing Receivable, Recorded Investment, Past Due	409		726		480
Financing Receivable, Modifications, Recorded Investment	25,110		22,980		23,237
Consumer Installment | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,139		841		707
Financing Receivable, Recorded Investment, Past Due	33		87		77
Financing Receivable, Modifications, Recorded Investment	1,172		928		784
Consumer Installment | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,551		1,687		2,352
Financing Receivable, Recorded Investment, Past Due	244		285		242
Financing Receivable, Modifications, Recorded Investment	1,795		1,972		2,594
Consumer Installment | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,528		1,663		2,352
Financing Receivable, Recorded Investment, Past Due	244		262		229
Financing Receivable, Modifications, Recorded Investment	1,772		1,925		2,581
Consumer Installment | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	23		24		0
Financing Receivable, Recorded Investment, Past Due	0		23		13
Financing Receivable, Modifications, Recorded Investment	23		47		13
Consumer Installment | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,053		1,243		1,006
Consumer Installment | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,005		1,178		1,006
Consumer Installment | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	48		65		0
Consumer Home Equity Lines Financing Receivable
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment			23,201		15,126
Consumer Home Equity Lines Financing Receivable | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,632		7,379		6,931
Consumer Home Equity Lines Financing Receivable | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,310		6,932		1,926
Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,909		8,890		6,269
Consumer Home Equity Lines Financing Receivable | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			20,986		12,686
Financing Receivable, Recorded Investment, Past Due			876		784
Financing Receivable, Modifications, Recorded Investment			21,862		13,470
Consumer Home Equity Lines Financing Receivable | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	6,680		6,239		5,571
Financing Receivable, Recorded Investment, Past Due	113		269		150
Financing Receivable, Modifications, Recorded Investment	6,793		6,508		5,721
Consumer Home Equity Lines Financing Receivable | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	6,610		6,186		1,322
Financing Receivable, Recorded Investment, Past Due	564		607		494
Financing Receivable, Modifications, Recorded Investment	7,174		6,793		1,816
Consumer Home Equity Lines Financing Receivable | Accruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,703		8,561		5,793
Financing Receivable, Recorded Investment, Past Due	939		0		140
Financing Receivable, Modifications, Recorded Investment	8,642		8,561		5,933
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			1,339		1,656
Financing Receivable, Recorded Investment, Past Due			0		0
Financing Receivable, Modifications, Recorded Investment			1,339		1,656
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	811		871		1,210
Financing Receivable, Recorded Investment, Past Due	28		0		0
Financing Receivable, Modifications, Recorded Investment	839		871		1,210
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	136		139		110
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	136		139		110
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	267		329		336
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	267		329		336
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	278		243		223
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	254		207		223
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0		9		0
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	24		27		0
Residential Mortgages
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	27,193	[1]	27,218	[1]	27,296	[1]
Residential Mortgages | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,822	[1]	25,251	[1]	26,199	[1]
Residential Mortgages | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,186		1,633	[1]	758	[1]
Residential Mortgages | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	185	[1]	334		339
Residential Mortgages | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment			334	[1]
Residential Mortgages | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	85,962		14,642
Financing Receivable, Recorded Investment, Past Due	30,155		3,538
Financing Receivable, Modifications, Recorded Investment	116,117		18,180
Residential Mortgages | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	14,299		13,440
Financing Receivable, Recorded Investment, Past Due	2,286		3,538
Financing Receivable, Modifications, Recorded Investment	16,585		16,978
Residential Mortgages | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,335		868
Financing Receivable, Recorded Investment, Past Due	0		0
Financing Receivable, Modifications, Recorded Investment	1,335		868
Residential Mortgages | Accruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	185		334		339
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	185		334		339
Residential Mortgages | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	13,081		5,476
Financing Receivable, Recorded Investment, Past Due	6,433		3,562
Financing Receivable, Modifications, Recorded Investment	19,514		9,038
Residential Mortgages | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	5,020		5,006
Financing Receivable, Recorded Investment, Past Due	3,217		3,267
Financing Receivable, Modifications, Recorded Investment	8,237		8,273
Residential Mortgages | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	616		470
Financing Receivable, Recorded Investment, Past Due	235		295
Financing Receivable, Modifications, Recorded Investment	851		765
Residential Mortgages | Nonaccruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		0		0
Financing Receivable, Recorded Investment, Past Due	0		0		0
Financing Receivable, Modifications, Recorded Investment	0		0		0
Residential Mortgages | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance			1,306
Residential Mortgages | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance			1,283
Residential Mortgages | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0		2
Residential Mortgages | Total Tdr Allowance | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0		21		0
Consumer Credit Card
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	815	[1]	854	[1]	1,034
Consumer Credit Card | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	815	[1]	854	[1]	1,034	[1]
Consumer Credit Card | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	721		775		930
Financing Receivable, Recorded Investment, Past Due	77		60		95
Financing Receivable, Modifications, Recorded Investment	798		835		1,025
Consumer Credit Card | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	721		775		930
Financing Receivable, Recorded Investment, Past Due	77		60		95
Financing Receivable, Modifications, Recorded Investment	798		835		1,025
Consumer Credit Card | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		15		0
Financing Receivable, Recorded Investment, Past Due	17		4		9
Financing Receivable, Modifications, Recorded Investment	17		19		9
Consumer Credit Card | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0		15		0
Financing Receivable, Recorded Investment, Past Due	17		4		9
Financing Receivable, Modifications, Recorded Investment	17		19		9
Consumer Credit Card | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	263		296		307
Consumer Credit Card | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	263		296		307
Consumer Residential Mortgages Financing Receivable
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	27,193				27,296
Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment					26,199
Consumer Residential Mortgages Financing Receivable | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment					758
Consumer Residential Mortgages Financing Receivable | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	15,819				15,846
Financing Receivable, Recorded Investment, Past Due	2,286				2,876
Financing Receivable, Modifications, Recorded Investment	18,105				18,722
Consumer Residential Mortgages Financing Receivable | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current					14,749
Financing Receivable, Recorded Investment, Past Due					2,876
Financing Receivable, Modifications, Recorded Investment					17,625
Consumer Residential Mortgages Financing Receivable | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current					758
Financing Receivable, Recorded Investment, Past Due					0
Financing Receivable, Modifications, Recorded Investment					758
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	5,636				4,968
Financing Receivable, Recorded Investment, Past Due	3,452				3,606
Financing Receivable, Modifications, Recorded Investment	9,088				8,574
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current					4,968
Financing Receivable, Recorded Investment, Past Due					3,606
Financing Receivable, Modifications, Recorded Investment					8,574
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current					0
Financing Receivable, Recorded Investment, Past Due					0
Financing Receivable, Modifications, Recorded Investment					0
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,416				1,241
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance					1,241
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance					0
Total consumer
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	79,936	[1]	77,153	[1]	70,071	[1]
Total consumer | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	60,151	[1]	58,389	[1]	59,982	[1]
Total consumer | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,691	[1]	9,540		3,481
Total consumer | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment					6,608
Total consumer | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,094	[1]	9,224	[1]
Total consumer | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	63,373		59,498		52,926
Financing Receivable, Recorded Investment, Past Due	4,421		5,287		4,312
Financing Receivable, Modifications, Recorded Investment	67,794		64,785		57,238
Total consumer | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	46,401		42,708		44,007
Financing Receivable, Recorded Investment, Past Due	2,885		4,593		3,601
Financing Receivable, Modifications, Recorded Investment	49,286		47,301		47,608
Total consumer | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	9,084		7,895		2,787
Financing Receivable, Recorded Investment, Past Due	597		694		571
Financing Receivable, Modifications, Recorded Investment	9,681		8,589		3,358
Total consumer | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	8,401		8,517		8,976
Financing Receivable, Recorded Investment, Past Due	3,741		3,851		3,857
Financing Receivable, Modifications, Recorded Investment	12,142		12,368		12,833
Total consumer | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,359		7,555		8,530
Financing Receivable, Recorded Investment, Past Due	3,506		3,533		3,844
Financing Receivable, Modifications, Recorded Investment	10,865		11,088		12,374
Total consumer | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	775		633		110
Financing Receivable, Recorded Investment, Past Due	235		318		13
Financing Receivable, Modifications, Recorded Investment	1,010		951		123
Total consumer | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	3,010		3,088		2,777
Total consumer | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,938		2,964		2,777
Total consumer | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	48		76		0
Consumer Home Equity Lines Financing Receivable | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,131,040		1,107,186		943,812
Financing Receivable, Recorded Investment, Past Due	3,198		3,150		2,990
Consumer Home Equity Lines Financing Receivable | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	212,258		226,354		275,296
Financing Receivable, Recorded Investment, Past Due	5,566		7,275		8,013
Consumer Residential Mortgages Financing Receivable | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	620,827		602,440		536,002
Financing Receivable, Recorded Investment, Past Due	19,153		22,843		19,969
Consumer Residential Mortgages Financing Receivable | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	362,458		372,685		425,719
Financing Receivable, Recorded Investment, Past Due	15,734		21,799		20,655
Consumer Credit Card | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	159,174		162,434		146,123
Financing Receivable, Recorded Investment, Past Due	$1,592		$2,044		$1,794
[1]	Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.
[2]	Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.

Allowance_for_Loan_Losses_Sche3

Allowance for Loan Losses Schedule of Defaulted Troubled Debt Restructuring (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	6	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$499,000	$6,772,000
Commercial and Industrial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	482,000	1,557,000
Commercial and Industrial | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	1,557,000
Commercial and Industrial | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	427,000	0
Commercial and Industrial | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	55,000
Commercial Real Estate
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	376,000
Commercial Real Estate | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	376,000
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	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate | Acquired 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 Construction Financing Receivable
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate Construction Financing Receivable | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate Construction Financing Receivable | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Commercial Real Estate Construction Financing Receivable | Acquired 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	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	482,000	1,933,000
Total commercial | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	1,933,000
Total commercial | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	427,000	0
Total commercial | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	55,000
Consumer Installment
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer Installment | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	306	0
Home Equity Line of Credit
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
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	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Consumer Credit Card
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	17,000	4,839,000
Consumer Credit Card | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	17,000	4,839,000
Residential Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	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	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0
Total consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	4	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	17,000	4,839,000
Total consumer | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
financing receivable, modifications, subsequent default, number of contracts at period end	4	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$17,000	$4,839,000

Allowance_for_Loan_Losses_Deta

Allowance for Loan Losses Details Textual (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Allowance For Loan And Lease Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$2,200,000
Loan Commitments	6,034,870,000	5,632,201,000	6,136,313,000
Minimum Non Performing Substandard Loans Outstanding for Allowance for Credit Losses	300,000
Minimum Non Performing Substandard Doubtful Loans Outstanding for Allowance for Credit Losses	100,000
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	100,000	100,000
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income	900,000	800,000
Covered Loans
Allowance For Loan And Lease Losses [Line Items]
Loans and Leases Receivable, Allowance, Covered	41,514,000	49,970,000	40,496,000	44,027,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	4,225,000	7,879,000
Benefit Attributable to FDIC Loss Share Agreements	-4,227,000	-4,824,000
Provision for Loan Lease and Other Losses Covered	-2,000	3,055,000
Total impaired loans with no related allowance
Allowance For Loan And Lease Losses [Line Items]
Loan Commitments	$6,100,000	$400,000	$200,000

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets-Accumulated Amortization of Intangible Assets Schedule (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$96,561	$96,561	$101,771
Finite-Lived Intangible Assets, Accumulated Amortization	-28,139	-25,541	-21,952
Finite-Lived Intangible Assets, Net	68,422	71,020	79,819
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	82,323	82,323	87,533
Finite-Lived Intangible Assets, Accumulated Amortization	-22,073	-19,996	-18,352
Finite-Lived Intangible Assets, Net	60,250	62,327	69,181
Lease Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	238	238	238
Finite-Lived Intangible Assets, Accumulated Amortization	-185	-176	-149
Finite-Lived Intangible Assets, Net	53	62	89
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	14,000	14,000	14,000
Finite-Lived Intangible Assets, Accumulated Amortization	-5,881	-5,369	-3,451
Finite-Lived Intangible Assets, Net	$8,119	$8,631	$10,549

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Details Textual) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$741,740	$741,740	$741,740
Amortization of Intangible Assets	2,598	2,936
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	7,793
Finite-Lived Intangible Assets, Amortization Expense, Year Two	9,209
Finite-Lived Intangible Assets, Amortization Expense, Year Three	8,161
Finite-Lived Intangible Assets, Amortization Expense, Year Four	7,273
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$6,500
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Citizens Republic Bancorp | Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Citizens Republic Bancorp | Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years

Shareholders_Equity_Reconcilia

Shareholders' Equity (Reconciliation of Basic and Diluted EPS) (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Net income	$57,139	$53,455
Preferred Stock Dividends, Income Statement Impact	1,469	1,469
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	407	380
Net income attributable to common shareholders	55,263	51,606
Weighted average number of common shares outstanding - basic	165,411	165,060
Earnings Per Share, Basic	$0.33	$0.31
Net Income (Loss) Available to Common Stockholders, Diluted	$55,263	$51,606
Weighted average number of common shares outstanding - diluted	166,003	166,004
Earnings Per Share, Diluted	$0.33	$0.31
Employee Stock Option
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Weighted average number of common shares outstanding - diluted	592	944

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Apr. 12, 2013
In Millions, except Share data, unless otherwise specified
Shareholders Equity Narrative [Line Items]
5.875% Non-Cumulative Perpetual Preferred stock, Series A, authorized 115,000 shares	7,000,000
Non-cumulative Perpetual Preferred Stock, Series A, Shares Authorized	115,000	115,000	115,000
5.875% Non-Cumulative Perpetual Preferred stock, Series A, 100,000 outstanding	100,000	100,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$0.80		$1
Citizens Republic Bancorp
Shareholders Equity Narrative [Line Items]
Interest rate of Non-Cumulative Perpetual Preferred Stock, Series A	5.88%
Citizens Republic Bancorp | Citizens Republic Bancorp
Shareholders Equity Narrative [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$17.50
FirstMerit | Citizens Republic Bancorp
Shareholders Equity Narrative [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	2,571,998			2,408,203

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
OPERATIONS:
Net interest income	$185,623	$193,900
Provision for Loan, Lease, and Other Losses	8,248	14,536
Noninterest Income	65,847	67,270
Other expenses	160,652	169,331
Net income	57,139	53,455
AVERAGES :
Assets	24,905,094	24,144,570
Segment Reporting Information Average Loans	15,427,181	14,412,481
Segment Reporting Information Average Earnings Assets	22,100,417	20,903,863
Segment Reporting Information Average Deposits	19,788,925	19,636,505
Segment Reporting Information Average Economic Capital	2,866,362	2,733,226
Total commercial
OPERATIONS:
Net interest income	99,844	105,063
Provision for Loan, Lease, and Other Losses	-526	5,706
Noninterest Income	22,490	21,306
Other expenses	61,653	63,966
Net income	39,785	36,884
AVERAGES :
Assets	9,454,218	9,072,390
Segment Reporting Information Average Loans	9,506,529	9,061,371
Segment Reporting Information Average Earnings Assets	9,794,483	9,308,031
Segment Reporting Information Average Deposits	6,886,945	6,645,640
Segment Reporting Information Average Economic Capital	848,890	654,922
Retail
OPERATIONS:
Net interest income	91,095	93,250
Provision for Loan, Lease, and Other Losses	7,533	8,339
Noninterest Income	21,737	27,035
Other expenses	88,271	96,701
Net income	11,068	9,909
AVERAGES :
Assets	5,845,417	5,449,856
Segment Reporting Information Average Loans	5,570,590	5,084,555
Segment Reporting Information Average Earnings Assets	5,582,849	5,101,740
Segment Reporting Information Average Deposits	11,124,158	11,753,015
Segment Reporting Information Average Economic Capital	479,188	320,090
Wealth
OPERATIONS:
Net interest income	5,353	4,678
Provision for Loan, Lease, and Other Losses	-170	-45
Noninterest Income	13,976	13,464
Other expenses	13,719	13,518
Net income	3,756	3,035
AVERAGES :
Assets	302,186	241,618
Segment Reporting Information Average Loans	292,016	230,429
Segment Reporting Information Average Earnings Assets	292,016	230,429
Segment Reporting Information Average Deposits	1,240,960	1,009,811
Segment Reporting Information Average Economic Capital	55,187	57,784
Nonreportable segments and reconciling items
OPERATIONS:
Net interest income	-10,669	-9,091
Provision for Loan, Lease, and Other Losses	1,411	536
Noninterest Income	7,644	5,465
Other expenses	-2,991	-4,854
Net income	2,530	3,627
AVERAGES :
Assets	9,303,273	9,380,706
Segment Reporting Information Average Loans	58,046	36,126
Segment Reporting Information Average Earnings Assets	6,431,069	6,263,663
Segment Reporting Information Average Deposits	536,862	228,039
Segment Reporting Information Average Economic Capital	$1,483,097	$1,700,430

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Designated as Hedging Instruments, Notional Values, Contractual Amounts and Fair Value) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014		Mar. 31, 2014
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	$72,573,000	$55,197,000		$46,467,000
Derivative Liability, Fair Value	65,447,000	55,439,000		55,106,000
Commercial Loan Swaps (FRAPS) | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0	0		5,389,000
Derivative Asset, Fair Value	0	0	[1]	1,000	[1]
Derivative Liability, Notional/Contract Amount	89,591,000	93,313,000		117,543,000
Derivative Liability, Fair Value	6,063,000	6,683,000		10,392,000
Sub Debt Swap | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000,000	250,000,000		0
Derivative Asset, Fair Value	12,688,000	5,256,000	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	0	0		0
Derivative Liability, Fair Value	0	0		0
Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Notional/Contract Amount	250,000,000	250,000,000		5,389,000
Derivative Asset, Fair Value	12,688,000	5,256,000	[1]	1,000	[1]
Derivative Liability, Notional/Contract Amount	89,591,000	93,313,000		117,543,000
Derivative Liability, Fair Value	6,063,000	6,683,000		10,392,000
Level 2
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	72,573,000	55,197,000		46,467,000
Derivative Liability, Fair Value	65,447,000	55,439,000		55,106,000
Level 2 | Interest rate swaps | Designated as Hedging Instrument
Derivatives designated in hedge relationships
Derivative Asset, Fair Value	12,688,000	5,256,000		1,000
Derivative Liability, Fair Value	$6,063,000	$6,683,000		$10,392,000
[1]	(1) Included in "Other assets" on the Consolidated Balance Sheets(2) Included in "Other liabilities" on the Consolidated Balance Sheets

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Not Designated as Hedging Instruments, Notional Values, Contractual Amounts and Fair Value) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Derivatives not designated in hedge relationships
Derivative Asset, Fair Value	$72,573,000		$55,197,000		$46,467,000
Derivative Liability, Fair Value	65,447,000		55,439,000		55,106,000
Not Designated as Hedging Instrument
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,823,082,000		1,855,599,000		1,806,773,000
Derivative Asset, Fair Value	59,885,000	[1]	49,941,000	[1]	46,466,000	[1]
Derivative Liability, Notional/Contract Amount	1,839,845,000		1,823,957,000		1,730,338,000
Derivative Liability, Fair Value	59,384,000		48,756,000		44,714,000
Not Designated as Hedging Instrument | Interest rate swaps
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	1,718,850,000		1,673,012,000		1,603,125,000
Derivative Asset, Fair Value	59,147,000		48,366,000	[1]	44,672,000	[1]
Derivative Liability, Notional/Contract Amount	1,718,850,000		1,673,012,000		1,603,125,000
Derivative Liability, Fair Value	59,147,000		48,366,000		44,672,000
Not Designated as Hedging Instrument | Mortgage loan commitments
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	51,937,000		102,523,000		132,614,000
Derivative Asset, Fair Value	388,000		1,408,000	[1]	1,575,000	[1]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	0		0		0
Not Designated as Hedging Instrument | Forward sales contracts
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	11,757,927		47,657,000		53,404,000
Derivative Asset, Fair Value			0	[1]	167,000	[1]
Derivative Liability, Notional/Contract Amount	0		0		0
Derivative Liability, Fair Value	68,000		272,000		0
Not Designated as Hedging Instrument | Credit Risk Contract
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	0		10,001,000		0
Derivative Asset, Fair Value	0	[1]	0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	80,047,000		69,227,000		49,456,000
Derivative Liability, Fair Value	0		0		0
Not Designated as Hedging Instrument | Foreign Exchange
Derivatives not designated in hedge relationships
Derivative Asset, Notional/Contract Amount	40,537,000		22,406,000		17,630,000
Derivative Asset, Fair Value	350,000		167,000	[1]	52,000	[1]
Derivative Liability, Notional/Contract Amount	10,052,000		6,580,000		15,898,000
Derivative Liability, Fair Value	169,000		118,000		42,000
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		0	[1]	0	[1]
Derivative Liability, Notional/Contract Amount	30,896,000		75,138,000		61,859,000
Derivative Liability, Fair Value	$0		$0		$0
[1]	(1) Included in "Other assets" on the Consolidated Balance Sheets(2) Included in "Other liabilities" on the Consolidated Balance Sheets

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities (Gains and Losses Recognized) (Details) (Not Designated as Hedging Instrument, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	($1,693)	$247
Mortgage loan commitments | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	-1,020	684
Forward sales contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	204	-216
Credit Risk Contract | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	-877	-221
Other Credit Derivatives | Other Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$0	$0

Derivatives_and_Hedging_Activi5

Derivatives and Hedging Activities (Offsetting Disclosure for Derivative Contracts) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Offsetting Disclosure for Derivative Contracts [Line Items]
offsetting disclosure, derivative asset, fair value, gross	$12,974	$5,742	$2,844
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	12,974	5,742	2,844
offseting disclosure, netting adjustment, derivative asset, fair value	-20	-324	-2,828
offsetting disclosure, collateral value, derivative asset	-266	-162	-16
offsetting disclosure, net amount total, derivative asset, fair value	12,688	5,256	0
offsetting disclosure, derivative liability, fair value, gross	65,190	54,725	52,270
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	65,190	54,725	52,270
offseting disclosure, netting adjustment, derivative liability, fair value	-20	-324	-2,828
offsetting disclosure, collateral value, derivative liability	-65,170	-54,401	-49,442
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 asset, fair value, gross	12,688	5,256
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0
offsetting disclosure, net amount, derivative asset, falir value	12,688	5,256
offseting disclosure, netting adjustment, derivative asset, fair value	0	0
offsetting disclosure, collateral value, derivative asset	0	0
offsetting disclosure, net amount total, derivative asset, fair value	12,688	5,256
offsetting disclosure, derivative liability, fair value, gross	6,063	6,683	10,392
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	6,063	6,683	10,392
offseting disclosure, netting adjustment, derivative liability, fair value	0	0	0
offsetting disclosure, collateral value, derivative liability	-6,063	-6,683	-10,392
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	67	352	2,811
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	67	352	2,811
offseting disclosure, netting adjustment, derivative asset, fair value	-67	-352	-2,811
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	59,080	48,014	41,861
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	59,080	48,014	41,861
offseting disclosure, netting adjustment, derivative liability, fair value	-67	-352	-2,811
offsetting disclosure, collateral value, derivative liability	-59,013	-47,662	-39,050
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	219	134	33
offsetting disclosure, offset amount, derivative asset, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative asset, falir value	219	134	33
offseting disclosure, netting adjustment, derivative asset, fair value	47	28	-17
offsetting disclosure, collateral value, derivative asset	-266	-162	-16
offsetting disclosure, net amount total, derivative asset, fair value	0	0	0
offsetting disclosure, derivative liability, fair value, gross	47	28	17
offsetting disclosure, offset amount, derivative liability, fair value, gross	0	0	0
offsetting disclosure, net amount, derivative liability, falir value	47	28	17
offseting disclosure, netting adjustment, derivative liability, fair value	47	28	-17
offsetting disclosure, collateral value, derivative liability	-94	-56	0
offsetting disclosure, net amount total, derivative liability, fair value	$0	$0	$0

Derivatives_and_Hedging_Activi6

Derivatives and Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Derivative [Line Items]
Term of written loan commitments, days	60
Default Assumptions Percentage	100.00%
Government Agency Issued Bonds or MBS
Derivative [Line Items]
Collateral posted against derivative liabilities	53,600,000	$53,500,000	$67,700,000
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative Asset, Notional Amount	250,000,000	$250,000,000	$5,389,000

Benefit_Plans_Schedule_of_Net_

Benefit Plans (Schedule of Net Benefit Costs Details) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$207	$182
Defined Benefit Plan, Interest Cost	3,517	3,584
Defined Benefit Plan, Expected Return on Plan Assets	-3,902	-4,009
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	570	634
Defined Benefit Plan, Amortization of Gains (Losses)	1,057	708
Defined Benefit Plan, Net Periodic Benefit Cost	1,449	1,099
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	41	16
Defined Benefit Plan, Interest Cost	144	164
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	-160	-117
Defined Benefit Plan, Amortization of Gains (Losses)	81	59
Defined Benefit Plan, Net Periodic Benefit Cost	$106	$122

Fair_Value_Measurement_Recurri

Fair Value Measurement (Recurring and Nonrecurring Table) (Details) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
True-up Liabitlity Discount Rate	3.05%		3.46%
True-up Liability Effect of Change in Discount Rate By One Percent	$700,000		($700,000)
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	63,800,000		58,300,000		56,000,000
Recurring Fair Value Measurements
Available-for-sale	3,791,059,000		3,433,171,000		3,545,288,000
Residential loans held for sale	3,568,000		7,143,000		13,428,000
Derivative Asset, Fair Value, Gross Asset	72,573,000		46,467,000		55,197,000
Total Assets, Fair Value Disclosure, Recurring	3,867,200,000		3,486,781,000		3,613,913,000
Derivative Liability, Fair Value, Gross Liability	65,447,000		55,106,000		55,439,000
True Up Liability	13,707,000		11,983,000		13,294,000
Total liabilities at fair value on a recurring basis	79,154,000	[1]	67,089,000		68,733,000	[1]
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	20,526,000	[2]	22,631,000		21,228,000	[2]
Impaired and Non Accrual Loans Fair Value Disclosure	63,839,000	[3]	58,296,000		56,041,000	[3]
Other Real Estate, Non Covered	16,956,000	[4]	11,568,000		12,510,000	[4]
Other Real Estate Covered by Loss Share	7,293,000	[5]	19,708,000		3,614,000	[5]
Nonrecurring Fair Value	108,614,000		112,203,000		93,393,000
Impairment of Noncovered Other Real Estate Owned	900,000		800,000		2,600,000
Impairment of Covered Other Real Esate Owned	100,000		400,000		1,200,000
Level 1
Recurring Fair Value Measurements
Available-for-sale	2,869,000		3,055,000		2,974,000
Residential loans held for sale	0		0		0
Derivative Asset, Fair Value, Gross Asset	0		0		0
Total Assets, Fair Value Disclosure, Recurring	2,869,000		3,055,000		2,974,000
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		0	[1]
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	0	[2]	0		0	[2]
Impaired and Non Accrual Loans Fair Value Disclosure	0	[3]	0		0	[3]
Other Real Estate, Non Covered	0	[4]	0		0	[4]
Other Real Estate Covered by Loss Share	0	[5]	0		0	[5]
Nonrecurring Fair Value	0		0		0
Level 2
Recurring Fair Value Measurements
Available-for-sale	3,441,959,000		3,080,691,000		3,203,127,000
Residential loans held for sale	3,568,000		7,143,000		13,428,000
Derivative Asset, Fair Value, Gross Asset	72,573,000		46,467,000		55,197,000
Total Assets, Fair Value Disclosure, Recurring	3,518,100,000		3,134,301,000		3,271,752,000
Derivative Liability, Fair Value, Gross Liability	65,447,000		55,106,000		55,439,000
True Up Liability	0		0		0
Total liabilities at fair value on a recurring basis	65,447,000	[1]	55,106,000		55,439,000	[1]
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	0	[2]	0		0	[2]
Impaired and Non Accrual Loans Fair Value Disclosure	0	[3]	0		0	[3]
Other Real Estate, Non Covered	0	[4]	0		0	[4]
Other Real Estate Covered by Loss Share	0	[5]	0		0	[5]
Nonrecurring Fair Value	0		0		0
Level 3
Recurring Fair Value Measurements
Available-for-sale	346,231,000		349,425,000		339,187,000
Residential loans held for sale	0		0		0
Derivative Asset, Fair Value, Gross Asset	0		0		0
Total Assets, Fair Value Disclosure, Recurring	346,231,000		349,425,000		339,187,000
Derivative Liability, Fair Value, Gross Liability	0		0		0
True Up Liability	13,707,000		11,983,000		13,294,000
Total liabilities at fair value on a recurring basis	13,707,000	[1]	11,983,000		13,294,000	[1]
Nonrecurring Fair Value Measurements [Abstract]
Fair Value of Mortgage Servicing Rights	20,526,000		22,631,000		21,228,000
Impaired and Non Accrual Loans Fair Value Disclosure	63,839,000		58,296,000		56,041,000
Other Real Estate, Non Covered	16,956,000		11,568,000		12,510,000	[4]
Other Real Estate Covered by Loss Share	7,293,000		19,708,000		3,614,000	[5]
Nonrecurring Fair Value	108,614,000		112,203,000		93,393,000
US Treasury Securities
Recurring Fair Value Measurements
Available-for-sale	0
Equity Securities
Recurring Fair Value Measurements
Available-for-sale	2,869,000		3,055,000		2,974,000
Equity Securities | Level 1
Recurring Fair Value Measurements
Available-for-sale	2,869,000		3,055,000		2,974,000
Equity Securities | Level 2
Recurring Fair Value Measurements
Available-for-sale	0		0		0
Equity Securities | Level 3
Recurring Fair Value Measurements
Available-for-sale	0		0		0
Non-marketable Equity Securities
Recurring Fair Value Measurements
Available-for-sale			3,281,000
Non-marketable Equity Securities | Level 2
Recurring Fair Value Measurements
Available-for-sale			10,000
Non-marketable Equity Securities | Level 3
Recurring Fair Value Measurements
Available-for-sale			3,271,000
US Government Agencies Debt Securities
Recurring Fair Value Measurements
Available-for-sale	2,513,000				2,482,000
U.S. States and political subdivisions debt securities
Recurring Fair Value Measurements
Available-for-sale	215,164,000		250,980,000		227,342,000
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	215,164,000		250,980,000		227,342,000
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	947,303,000		1,023,994,000		970,998,000
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			1,023,994,000		970,998,000
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	140,359,000		85,133,000		103,403,000
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			85,133,000		103,403,000
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	1,892,560,000		1,548,104,000		1,676,567,000
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			1,548,104,000		1,676,567,000
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	6,000		8,000		7,000
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	1,000		1,000		1,000
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency | Level 3
Recurring Fair Value Measurements
Available-for-sale	5,000		7,000		6,000
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
Recurring Fair Value Measurements
Available-for-sale	244,059,000		172,469,000		222,334,000
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			172,469,000		222,334,000
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	52,264,000		51,588,000		51,337,000
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			51,588,000		51,337,000
Collateralized Loan Obligations
Recurring Fair Value Measurements
Available-for-sale	293,962,000		294,559,000		287,844,000
Collateralized Loan Obligations | Level 1
Recurring Fair Value Measurements
Available-for-sale	0		0		0
Collateralized Loan Obligations | Level 2
Recurring Fair Value Measurements
Available-for-sale	0		0		0
Collateralized Loan Obligations | Level 3
Recurring Fair Value Measurements
Available-for-sale			294,559,000		287,844,000
Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	59,885,000	[6]	46,466,000	[6]	49,941,000	[6]
Derivative Liability, Fair Value, Gross Liability	59,384,000		44,714,000		48,756,000
Credit Risk 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		0		0
Interest Rate Swap | Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	12,688,000		1,000	[6]	5,256,000	[6]
Derivative Liability, Fair Value, Gross Liability	6,063,000		10,392,000		6,683,000
Interest Rate Swap | 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 | Designated as Hedging Instrument | Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	12,688,000		1,000		5,256,000
Derivative Liability, Fair Value, Gross Liability	6,063,000		10,392,000		6,683,000
Interest Rate Swap | 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
Interest Rate Swap | Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	59,147,000		44,672,000	[6]	48,366,000	[6]
Derivative Liability, Fair Value, Gross Liability	59,147,000		44,672,000		48,366,000
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	59,147,000		44,672,000		48,366,000
Derivative Liability, Fair Value, Gross Liability	59,147,000		44,672,000		48,366,000
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	388,000		1,575,000	[6]	1,408,000	[6]
Derivative Liability, Fair Value, Gross Liability	0		0		0
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	388,000		1,575,000		1,408,000
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			167,000	[6]	0	[6]
Derivative Liability, Fair Value, Gross Liability	68,000		0		272,000
Forward sales contracts | Not Designated as Hedging Instrument | Level 1
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset			0		0
Derivative Liability, Fair Value, Gross Liability	0				0
Forward sales contracts | Not Designated as Hedging Instrument | Level 2
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	0		167,000		0
Derivative Liability, Fair Value, Gross Liability	68,000				272,000
Forward sales contracts | Not Designated as Hedging Instrument | Level 3
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset			0		0
Derivative Liability, Fair Value, Gross Liability	0				0
Foreign Exchange | Not Designated as Hedging Instrument
Recurring Fair Value Measurements
Derivative Asset, Fair Value, Gross Asset	350,000		52,000	[6]	167,000	[6]
Derivative Liability, Fair Value, Gross Liability	169,000		42,000		118,000
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	350,000		52,000		167,000
Derivative Liability, Fair Value, Gross Liability	169,000		42,000		118,000
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		0	[6]	0	[6]
Derivative Liability, Fair Value, Gross Liability	0		0		0
Other Contract | Not Designated as Hedging Instrument | Level 1
Recurring Fair Value Measurements
Derivative Liability, Fair Value, Gross Liability	0
Other Contract | Not Designated as Hedging Instrument | Level 3
Recurring Fair Value Measurements
Derivative Liability, Fair Value, Gross Liability	$0
[1]	(1) There were no transfers between levels 1, 2 or 3 of the fair value hierarchy during the three months ended MarchB 31, 2015.
[2]	(2) MSRs with a recorded investment of $21.5 million were reduced by a specific valuation allowance totaling $1.1 million to a reported carrying value of $20.4 million resulting in recognition of $0.2 million in expense included in loan sales and servicing income in the three months ended MarchB 31, 2015.
[3]	(3) Collateral dependent impaired loans with a recorded investment of $75.6 million were reduced by specific valuation allowance allocations totaling $11.8 million to a reported net carrying value of $63.8 million.
[4]	(4) Amounts do not include assets held at cost at MarchB 31, 2015. During the three months ended MarchB 31, 2015, the re-measurement of foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.9 million included in noninterest expense.
[5]	(5) Amounts do not include assets held at cost at MarchB 31, 2015. During the three months ended MarchB 31, 2015, the re-measurement of covered foreclosed assets at fair value subsequent to initial recognition resulted in losses of $0.1 million included in noninterest expense.
[6]	(1) Included in "Other assets" on the Consolidated Balance Sheets(2) Included in "Other liabilities" on the Consolidated Balance Sheets

Fair_Value_Measurement_Changes

Fair Value Measurement (Changes in Level 3 Table) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	$0		$0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0		0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Available-for-sale securities, Beginning balance	339,187		347,610
True-up liability, Beginning balance	13,294		11,463
Available-for-sale securities, Total unrealized gains/losses	0	[1]	0	[1]
True-up liability, Total unrealized gains/losses	413		520	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	6,682	[2]	1,768	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	[2]	0	[2]
Available-for-sale securities, Settlements	362		47
True-up liability, Settlements	0		0
Available-for-sale securities, Ending balance	346,231		349,425
True-up liability, Ending balance	$13,707		$11,983
[1]	(1) Reported in "Other expense
[2]	(2) Reported in "Other comprehensive income (loss)

Fair_Value_Measurement_Summary

Fair Value Measurement (Summary of Change in Fair Value Carrying Amount of Residential Mortgages ) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014		Mar. 31, 2014
In Thousands, unless otherwise specified
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$3,568	$13,428		$7,143
Aggregate Fair Value
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	4,657	14,389		7,143
Contractual Balance
Fair Value of Assets Loans Receivable Aggregate Unpaid Principal [Line Items]
Loans Held-for-sale, Fair Value Disclosure	4,489	13,873		6,955
Fair Value, Option, Loans Held as Assets, Aggregate Difference	$168	$516	[1]	$188
[1]	(1) These changes are included in "Loan sales and servicing income" in the Consolidated Statements of Income.

Fair_Value_Measurement_Fair_Va

Fair Value Measurement (Fair Value Disclosure by Balance Sheet Grouping ) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financial assets:
Cash and Cash Equivalents, at Carrying Value	$532,425,000	$959,285,000	$697,424,000	$917,822,000
Cash and due from banks, Fair Value	532,425,000	959,285,000	697,424,000
Available-for-sale Securities, Carrying Amount	3,791,059,000	3,433,171,000	3,545,288,000
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	2,855,174,000	3,079,620,000	2,903,609,000
Held-to-maturity Securities, Carrying Amount		3,079,620,000	2,903,609,000
Held-to-maturity Securities, Fair Value	2,848,912,000	2,990,161,000	2,875,920,000
Other Investments, Carrying Amount	148,475,000	148,446,000	148,654,000
Other Investments, Fair Value	148,475,000	148,446,000	148,654,000
Loans Receivable Held-for-sale, Carrying Amount	3,568,000	7,143,000	13,428,000
Loans Held-for-sale, Fair Value Disclosure	3,568,000	7,143,000	13,428,000
Loans and Leases Receivable, Net Amount	15,344,337,000	14,463,553,000	15,182,498,000
Originated loans and leases receivable, carrying value		10,734,797,000	12,398,116,000
Net noncovered loans, Fair Value	12,588,147,000	10,621,047,000	12,235,530,000
Net covered loans and loss share receivable, Carrying Amount		495,815,000
Net covered loans and loss share receivable, Fair Value	268,459,000	495,815,000	312,659,000
Accrued interest receivable, Carrying Amount	69,086,000	64,555,000	63,657,000
Accrued interest receivable, Fair Value	69,086,000	64,555,000	63,657,000
Derivative Assets, Carrying Amount	72,573,000	46,467,000	55,197,000
Derivative Asset, Fair Value, Gross Asset	72,573,000	46,467,000	55,197,000
Financial liabilities:
Deposits, Carrying Amount	19,925,595,000	19,811,674,000	19,504,665,000
Deposits, Fair Value	19,932,571,000	19,810,963,000	19,510,192,000
Total Federal funds purchased and securities sold under agreements to repurchase, Carrying Amount	1,113,371,000	926,195,000	1,272,591,000
Federal funds purchased and securities sold under agreements to repurchase, Fair Value	1,113,371,000	926,195,000	1,272,591,000
Wholesale Borrowings, Carrying Amount	316,628,000	349,277,000	428,071,000
Other Borrowings, Fair Value	320,180,000	352,923,000	430,676,000
Long-term Debt	512,625,000	324,430,000	505,192,000
Long-term Debt, Fair Value	527,018,000	330,337,000	516,476,000
Accrued interest payable, Carrying Amount	9,620,000	5,682,000	9,820,000
Accrued interest payable, Fair Value	9,620,000	5,682,000	9,820,000
Derivative liabilities, Carrying Amount	65,447,000	55,106,000	55,439,000
Derivative Liability, Fair Value, Gross Liability	65,447,000	55,106,000	55,439,000
Mortgage Servicing rights Valuation Allowance	-1,131,000	-425,000	-955,000	-282,000
Mortgage Servicing Rights Net Carrying balance	20,359,000	22,044,000	21,100,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	-176,000	143,000	-700,000
Impaired Collateral Dependant Loans, Recorded Investment	75,600,000	65,300,000	60,300,000
Determination Of Specific Allowance For Loan Losses	-11,800,000	-7,000,000	-4,300,000
Fair Value, Inputs, Level 1
Financial assets:
Cash and due from banks, Fair Value		959,285,000	697,424,000
Available-for-sale Securities, Carrying Amount	2,869,000	3,055,000	2,974,000
Held-to-maturity Securities, Fair Value	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	0	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	3,441,959,000	3,080,691,000	3,203,127,000
Held-to-maturity Securities, Fair Value		2,990,161,000	2,875,920,000
Other Investments, Fair Value		148,446,000	148,654,000
Loans Held-for-sale, Fair Value Disclosure	3,568,000	7,143,000	13,428,000
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	69,086,000	64,555,000	63,657,000
Derivative Asset, Fair Value, Gross Asset	72,573,000	46,467,000	55,197,000
Financial liabilities:
Deposits, Fair Value	19,932,571,000	19,810,963,000	19,510,192,000
Federal funds purchased and securities sold under agreements to repurchase, Fair Value		926,195,000	1,272,591,000
Other Borrowings, Fair Value	320,180,000	352,923,000	430,676,000
Long-term Debt, Fair Value	527,018,000	330,337,000	516,476,000
Accrued interest payable, Fair Value	9,620,000	5,682,000	9,820,000
Derivative Liability, Fair Value, Gross Liability	65,447,000	55,106,000	55,439,000
Level 3
Financial assets:
Cash and due from banks, Fair Value	0	0	0
Available-for-sale Securities, Carrying Amount	346,231,000	349,425,000	339,187,000
Held-to-maturity Securities, Fair Value	0	0	0
Other Investments, Fair Value	0	0	0
Loans Held-for-sale, Fair Value Disclosure	0	0	0
Loans and Leases Receivable, Net Amount		3,367,024,000
Net noncovered loans, Fair Value	12,588,147,000	10,621,047,000	12,235,530,000
Net covered loans and loss share receivable, Fair Value	268,459,000	495,815,000	312,659,000
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	0	0
Accrued interest payable, Fair Value	0	0	0
Derivative Liability, Fair Value, Gross Liability	0	0	0
Originated Loans
Financial assets:
Loans and Leases Receivable, Net Amount	12,758,492,000	10,734,797,000	12,398,116,000
Acquired Loans
Financial assets:
Loans and Leases Receivable, Net Amount	2,317,386,000	3,232,941,000	2,471,723,000
Net noncovered loans, Fair Value	2,393,942,000	3,367,024,000	2,564,842,000
Acquired Loans | Fair Value, Inputs, Level 1
Financial assets:
Net noncovered loans, Fair Value	0	0	0
Acquired Loans | Fair Value, Inputs, Level 2
Financial assets:
Net noncovered loans, Fair Value	0	0	0
Acquired Loans | Level 3
Financial assets:
Net noncovered loans, Fair Value	$2,393,942,000		$2,564,842,000

Fair_Value_Measurement_Narrati

Fair Value Measurement (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage Servicing Rights	$21,490,000	$22,469,000	$22,011,000	$22,760,000
Mortgage Servicing rights Valuation Allowance	1,131,000	425,000	955,000	282,000
Mortgage Servicing Rights Net Carrying balance	20,359,000	22,044,000	21,100,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	176,000	-143,000	700,000
Impaired Collateral Dependant Loans, Recorded Investment	75,600,000	65,300,000	60,300,000
Determination Of Specific Allowance For Loan Losses	11,800,000	7,000,000	4,300,000
Collateral Dependant Impaired and Non Accrual Loans Carrying Amount	63,800,000	58,300,000	56,000,000
Impairment of Real Estate	900,000	800,000	2,600,000
Impairment of Covered Other Real Esate Owned	100,000	400,000	1,200,000
Percent of available for sale securities classified as level 2	91.00%
Percentage of Level 3 investments in available for sale investment portfolio	9.00%
True up liability, discount period	10 years
True-up Liabitlity Discount Rate	3.05%	3.46%
True-up Liability Effect of Change in Discount Rate By One Percent	700,000	-700,000
Number of loans that were 90 days or more past due, or were any on nonaccrual status	0
Midwest
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of true up liability	8,600,000	7,400,000	8,500,000
Percent of cumulative shared loss payments under loss sharing agreements	25.00%
Percent of FDIC Intrinsic Loss Estimate			20.00%
Intrinsic Loss Estimate of the FDIC	152,000,000
Percent of Asset Premium Paid	25.00%
Asset Premium Paid	21,000,000
George Washington
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of true up liability	5,100,000	4,600,000	4,800,000
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
Percent of cumulative shared loss payments under loss sharing agreements	25.00%

Mortgage_Servicing_Rights_and_2

Mortgage Servicing Rights and Mortgage Servicing Activity (Changes in the Carrying Amount of Mortgage Servicing Rights) (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
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	$1,510,000
Mortage Servicing Rights Amortized Value [Roll Forward]
Mortgage Servicing Rights Beginning of Period	22,011,000		22,760,000	22,760,000
Mortgage Servicing Rights Additions	470,000		564,000
Amortization of Mortgage Servicing Rights (MSRs)	991,000		-855,000
Mortgage Servicing Rights, End of Period	21,490,000		22,469,000	22,011,000
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Mortgage Servicing rights Valuation Allowance Beginning of Period	955,000		282,000	282,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	-176,000		143,000	-700,000
Mortgage Servicing rights Valuation Allowance, End of Period	1,131,000		425,000	955,000
Mortgage Servicing Rights Net Carrying balance	20,359,000		22,044,000	21,100,000
Fair Value of Mortgage Servicing Rights	20,526,000	[1]	22,631,000	21,228,000	[1]
Fair Value, Inputs, Level 3
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Fair Value of Mortgage Servicing Rights	20,526,000		22,631,000	21,228,000
Residential Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing Asset	$2,600,000,000		$2,700,000,000
[1]	(2) MSRs with a recorded investment of $21.5 million were reduced by a specific valuation allowance totaling $1.1 million to a reported carrying value of $20.4 million resulting in recognition of $0.2 million in expense included in loan sales and servicing income in the three months ended MarchB 31, 2015.

Mortgage_Servicing_Rights_and_3

Mortgage Servicing Rights and Mortgage Servicing Activity (Changes in Key Economic Assumptions) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Changes in Key Assumptions [Abstract]
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	$1,222
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.39%
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	632
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	12.63%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life	93 months 12 days
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed	$778

Narrative_Details

(Narrative) Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Guarantor Obligations, Short-Term			$199,800,000
Mortgage Servicing Rights	21,490,000	22,469,000	22,011,000	22,760,000
Unpaid principal balances from sale of residential mortgage loans	50,300,000	65,600,000
Recognized pretax gains	600,000	1,300,000
Related mortgage servicing rights from loans sold and receives servicing fees	45,200,000	57,100,000
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%
Residential Mortgages
Servicing Assets at Fair Value [Line Items]
Loan servicing fees	1,600,000	1,600,000
Servicing Asset	2,600,000,000	2,700,000,000
Manufactured Housing
Servicing Assets at Fair Value [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	$3,700,000	$6,400,000

Commitments_and_Contingencies_1

Commitments and Contingencies (Schedule of Commitments to Extend Credit) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan Commitments	$6,034,870	$6,136,313	$5,632,201
Commercial Loan
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan Commitments	3,691,193	3,748,690	3,394,877
Total consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan Commitments	$2,343,677	$2,387,623	$2,237,324

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Guarantor Obligations) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Guarantor Obligations [Line Items]
Guarantor Obligations, Short-Term		$199,800,000
Guarantor Obligations, Current Carrying Value	315,732,000	287,461,000	232,190,000
Standby Letters of Credit
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	275,736,000	242,390,000	194,118,000
Loans Sold with Recourse
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	$39,996,000	$45,071,000	$38,072,000

Commitments_and_Contingencies_3

Commitments and Contingencies (Schedule of Changes in Repurchase Reserve) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Repurchase Reserve, Beginning Balance	$8,374	$9,851
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	-198	-2,593
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	-400	2,059
Financing Receivable, Repurchase Reserve, Ending Balance	7,776	9,317
Residential Mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Repurchase Reserve, Assumed Obligation	6,650
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Repurchase Reserve, Beginning Balance	7,250	8,737
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	-198	-2,593
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	-402	2,056
Financing Receivable, Repurchase Reserve, Ending Balance	6,650	8,200
Manufactured Housing
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Repurchase Reserve, Beginning Balance	1,124	1,114
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	0	0
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	2	3
Financing Receivable, Repurchase Reserve, Ending Balance	$1,126	$1,117

Commitments_and_Contingencies_4

Commitments and Contingencies (Narratives) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Asset sales [Line Items]
Financing Receivable, Repurchase Reserve	$7,776,000	$8,374,000	$9,317,000	$9,851,000
Allowance for Loan and Leases Losses, Reserve Associated with Loans Sold with Recourse	7,800,000	8,400,000	9,300,000
Allowance for Loan and Lease Losses, Unfunded Lending Commitments	4,300,000		7,500,000
Residential Mortgages
Asset sales [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	33,100,000	38,100,000	27,500,000
Financing Receivable, Repurchase Reserve	6,650,000	7,250,000	8,200,000	8,737,000
Manufactured Housing
Asset sales [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	3,700,000		6,400,000
Financing Receivable, Repurchase Reserve	1,126,000	1,124,000	1,117,000	1,114,000
Allowance for Loan and Leases Losses, Reserve Associated with Loans Sold with Recourse	$1,100,000

Changes_and_Reclassifications_2

Changes and Reclassifications Out of Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service cost reclassified to other noninterest expense, before Tax	$410
Amortization of prior service cost reclassified to other noninterest expense, Tax	143	0
Amortization of prior service cost reclassified to other noninterest expense, Net of Tax	267	0
Accumulated Other Comprehensive Income (Loss), before Tax	-75,792	-85,390
accumulated other comprehensive income, tax	-26,525	-29,886
Accumulated other comprehensive loss	-49,267	-55,504	-71,892
Changes in unrealized securities' holding gains/(losses), before Tax	34,117	18,044
Changes in unrealized securities' holding gains/(losses), Tax	11,941	6,315
Changes in unrealized securities' holding gains/(losses), Net of Tax	22,176	11,729
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity, before Tax	-504	-494
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity, Tax	-176	-173
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity , Net of Tax	-328	-321
Net losses/(gains) realized on sale of securities reclassified to noninterest income, before Tax	-354	-56
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Tax	-124	-20
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Net of Tax	-230	-36
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	-100,520	-57,812	-102,068	-57,812
Accumulated other comprehensive income reclassifications, benefit plan, tax	-35,181	-20,233	-35,722	-20,233
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	-65,339	-37,579	-66,346	-37,579
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax		0
Amortization of actuarial losses/(gains), before Tax	1,138
Amortization of actuarial losses/(gains), Tax	398	0
Amortization of actuarial losses/(gains), Net of Tax	740
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	24,728	-27,578	-8,531	-45,072
accumulated other comprehensive income, tax	8,656	-9,653	-2,985	-15,775
Accumulated other comprehensive loss	$16,072	($17,925)	($5,546)	($29,297)

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
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	($75,792)	($85,390)
Net losses/(gains) realized on sale of securities reclassified to noninterest income, before Tax	354	56
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Tax	124	20
Net losses/(gains) realized on sale of securities reclassified to noninterest income, Net of Tax	-230	-36
Accumulated other comprehensive loss	-49,267	-55,504	-71,892
accumulated other comprehensive income, tax	-26,525	-29,886
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	-100,520	-57,812	-102,068	-57,812
Changes in unrealized securities' holding gains/(losses) that result from securities being transferred from available-for-sale to held-to-maturity, Tax	-176	-173
Accumulated Net Unrealized Investment Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	24,728	-27,578	-8,531	-45,072
Accumulated other comprehensive loss	16,072	-17,925	-5,546	-29,297
accumulated other comprehensive income, tax	$8,656	($9,653)	($2,985)	($15,775)