Associated Banc-Corp (ASB) 10-Q 30 Oct 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 29, 2015
Document And Entity Information [Abstract]
Trading Symbol	ASB
Entity Registrant Name	ASSOCIATED BANC-CORP
Entity Central Index Key	7,789
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		150,327,891

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 303,701	$ 444,113
Interest-bearing deposits in other financial institutions	70,023	571,924
Federal funds sold and securities purchased under agreements to resell	36,490	16,030
Investment securities held to maturity, at amortized cost	604,799	404,455
Investment securities available for sale, at fair value	5,403,656	5,396,812
Federal Home Loan Bank (FHLB) and Federal Reserve Bank stocks, at cost	160,871	189,107
Loans held for sale	105,144	154,935
Loans	18,524,773	17,593,846
Allowance for loan losses	(262,536)	(266,302)
Loans, net	18,262,237	17,327,544
Premises and equipment, net	271,119	274,688
Goodwill	968,844	929,168
Other intangible assets, net	78,380	67,582
Trading assets	43,752	35,163
Other assets	1,158,227	1,010,253
Total assets	27,467,243	26,821,774
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits	4,657,261	4,505,272
Interest-bearing deposits	15,901,134	14,258,232
Total deposits	20,558,395	18,763,504
Federal funds purchased and securities sold under agreements to repurchase	702,569	493,991
Other short-term funding	319,766	574,297
Long-term funding	2,679,542	3,930,117
Trading liabilities	45,817	37,329
Accrued expenses and other liabilities	207,357	222,285
Total liabilities	24,513,446	24,021,523
Stockholders’ equity
Preferred equity	121,379	59,727
Common stock	1,642	1,665
Surplus	1,455,034	1,484,933
Retained earnings	1,570,199	1,497,818
Accumulated other comprehensive income (loss)	15,376	(4,850)
Treasury stock, at cost	(209,833)	(239,042)
Total stockholders’ equity	2,953,797	2,800,251
Total liabilities and stockholders’ equity	$ 27,467,243	$ 26,821,774
Preferred shares issued (in shares)	125,114	61,356
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Common shares issued (in shares)	164,200,068	166,544,252
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Treasury shares of common stock (in shares)	13,272,472	15,002,318

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
INTEREST INCOME
Interest and fees on loans	$ 155,663	$ 152,030	$ 460,025	$ 442,046
Interest and dividends on investment securities:
Taxable	24,937	25,037	73,897	77,403
Tax exempt	7,917	7,483	23,369	21,484
Other interest	1,489	1,503	4,952	4,814
Total interest income	190,006	186,053	562,243	545,747
INTEREST EXPENSE
Interest on deposits	8,521	6,621	24,281	18,975
Interest on Federal funds purchased and securities sold under agreements to repurchase	248	390	714	1,001
Interest on other short-term funding	83	233	279	629
Interest on long-term funding	10,645	6,179	32,159	18,836
Total interest expense	19,497	13,423	57,433	39,441
NET INTEREST INCOME	170,509	172,630	504,810	506,306
Provision for credit losses	8,000	1,000	17,500	11,000
Net interest income after provision for credit losses	162,509	171,630	487,310	495,306
NONINTEREST INCOME
Trust service fees	12,273	12,218	36,875	35,946
Service charges on deposit accounts	17,385	17,961	48,894	51,773
Card-based and other nondeposit fees	12,618	12,407	38,631	37,493
Insurance commissions	17,561	7,860	57,366	33,828
Brokerage and annuity commissions	3,809	4,040	11,684	12,593
Mortgage banking, net	6,643	6,669	23,992	18,392
Capital market fees, net	2,170	2,939	7,329	7,360
Bank owned life insurance income	2,448	3,506	7,704	10,837
Asset gains, net	95	4,934	3,084	6,561
Investment securities gains, net	2,796	57	4,038	469
Other	2,118	2,317	6,916	5,424
Total noninterest income	79,916	74,908	246,513	220,676
NONINTEREST EXPENSE
Personnel expense	101,134	97,650	304,272	293,141
Occupancy	14,187	13,743	46,178	43,088
Equipment	6,003	6,133	17,514	18,636
Technology	14,748	13,573	46,660	40,891
Business development and advertising	5,964	7,467	18,120	17,606
Other intangible amortization	885	990	2,574	2,972
Loan expense	3,305	3,813	9,982	10,220
Legal and professional fees	4,207	4,604	13,089	13,228
Foreclosure / OREO expense	496	2,083	3,224	5,554
FDIC expense	6,000	6,859	18,500	16,805
Other	14,507	14,938	42,394	45,295
Total noninterest expense	171,436	171,853	522,507	507,436
Income before income taxes	70,989	74,685	211,316	208,546
Income tax expense	21,551	24,478	65,806	66,775
Net income	49,438	50,207	145,510	141,771
Preferred stock dividends	2,184	1,255	4,957	3,777
Net income available to common equity	$ 47,254	$ 48,952	$ 140,553	$ 137,994
Earnings per common share:
Basic (in usd per share)	$ 0.31	$ 0.31	$ 0.93	$ 0.86
Diluted (in usd per share)	$ 0.31	$ 0.31	$ 0.92	$ 0.85
Average common shares outstanding:
Basic (in shares)	148,614	155,925	149,524	159,090
Diluted (in shares)	149,799	156,991	150,704	159,993

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 49,438	$ 50,207	$ 145,510	$ 141,771
Investment securities available for sale:
Net unrealized gains (losses)	22,907	(20,123)	35,101	36,061
Reclassification adjustment for net gains realized in net income	(2,796)	(57)	(4,038)	(469)
Income tax (expense) benefit	(7,725)	7,757	(11,907)	(13,684)
Other comprehensive income (loss) on investment securities available for sale	12,386	(12,423)	19,156	21,908
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	12	15	37	45
Amortization of actuarial losses	627	317	1,692	949
Income tax expense	(243)	(128)	(659)	(383)
Other comprehensive income on pension and postretirement obligations	396	204	1,070	611
Total other comprehensive income (loss)	12,782	(12,219)	20,226	22,519
Comprehensive income	$ 62,220	$ 37,988	$ 165,736	$ 164,290

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Equity [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2013	$ 2,891,290	$ 61,862	$ 1,750	$ 1,617,990	$ 1,392,508	$ (24,244)	$ (158,576)
Comprehensive income:
Net income	141,771	0	0	0	141,771	0	0
Other comprehensive income	22,519	0	0	0	0	22,519	0
Comprehensive income	164,290
Common stock issued:
Stock-based compensation plans, net	11,131	0	0	1,863	(20,556)	0	29,824
Purchase of common stock returned to authorized but unissued	(50,498)	0	(31)	(50,467)	0	0	0
Purchase of treasury stock	(112,245)	0	0	0	0	0	(112,245)
Cash dividends:
Common stock ($0.27 per share in 2014 and $0.30 per share in 2015)	(43,299)	0	0	0	(43,299)	0	0
Preferred stock	(3,777)	0	0	0	(3,777)	0	0
Purchase of preferred stock	(960)	(838)	0	0	(122)	0	0
Stock-based compensation expense, net	12,462	0	0	12,462	0	0	0
Tax benefit of stock-based compensation	1,184	0	0	1,184	0	0	0
Ending balance at Sep. 30, 2014	2,869,578	61,024	1,719	1,583,032	1,466,525	(1,725)	(240,997)
Beginning balance at Dec. 31, 2014	2,800,251	59,727	1,665	1,484,933	1,497,818	(4,850)	(239,042)
Comprehensive income:
Net income	145,510	0	0	0	145,510	0	0
Other comprehensive income	20,226	0	0	0	0	20,226	0
Comprehensive income	165,736
Common stock issued:
Stock-based compensation plans, net	15,373	0	0	2,880	(21,786)	0	34,279
Acquisition of Ahmann & Martin Co.	43,530	0	26	43,504	0	0	0
Purchase of common stock returned to authorized but unissued	(93,000)	0	(49)	(92,951)	0	0	0
Purchase of treasury stock	(5,070)	0	0	0	0	0	(5,070)
Cash dividends:
Common stock ($0.27 per share in 2014 and $0.30 per share in 2015)	(45,599)	0	0	0	(45,599)	0	0
Preferred stock	(4,957)	0	0	0	(4,957)	0	0
Issuance of preferred stock	62,966	62,966	0	0	0	0	0
Purchase of preferred stock	(1,335)	(1,209)	0	0	(126)	0	0
Other	(766)	(105)	0	0	(661)	0	0
Stock-based compensation expense, net	14,575	0	0	14,575	0	0	0
Tax benefit of stock-based compensation	2,093	0	0	2,093	0	0	0
Ending balance at Sep. 30, 2015	$ 2,953,797	$ 121,379	$ 1,642	$ 1,455,034	$ 1,570,199	$ 15,376	$ (209,833)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Retained Earnings [Member]
Cash dividends:
Common stock, per share	$ 0.30	$ 0.27

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 49,438	$ 50,207		$ 145,510	$ 141,771
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	8,000	1,000		17,500	11,000
Depreciation and amortization				35,788	38,023
Recovery of valuation allowance on mortgage servicing rights, net				(306)	(89)
Amortization of mortgage servicing rights				8,902	8,224
Amortization of other intangible assets	885	990		2,574	2,972
Amortization and accretion on earning assets, funding, and other, net				29,039	21,647
Tax impact of stock based compensation				2,093	1,184
Gain on sales of investment securities, net	(2,796)	(57)		(4,038)	(469)	$ (494)
Gain on sales of assets and impairment write-downs, net	(95)	(4,934)		(3,084)	(6,561)
Gain on mortgage banking activities, net				(15,504)	(11,668)
Mortgage loans originated and acquired for sale				(911,133)	(777,532)
Proceeds from sales of mortgage loans held for sale				941,575	735,565
Pension contributions				0	(21,000)
Increase in interest receivable				(3,404)	(3,301)
Decrease in interest payable				2,642	6,451
Other, net				(3,492)	(2,603)
Net cash provided by operating activities				239,378	130,712
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans				(935,208)	(1,292,718)
Purchases of:
Available for sale securities				(2,075,062)	(808,899)
Held to maturity securities				(207,139)	(126,602)
FHLB stock				(14,279)	(7,626)
Premises, equipment, and software, net of disposals				(36,778)	(35,507)
Other assets				(9,903)	(2,460)
Proceeds from:
Sales of available for sale securities			$ 1,000,000	1,066,957	101,987	102,011
Sales of available for sale securities				42,514	0
Prepayments, calls, and maturities of available for sale securities				869,635	620,606
Prepayments, calls, and maturities of held to maturity securities				7,190	6,170
Prepayments, calls, and maturities of other assets				17,793	29,136
Net cash received in acquisition				1,132	0
Net cash used in investing activities				(1,273,148)	(1,515,913)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits				1,794,891	934,091
Net increase (decrease) in short-term funding				(45,953)	689,254
Repayment of long-term funding				(1,500,026)	(155,058)
Proceeds from issuance of long-term funding				250,000	0
Purchase of common stock returned to authorized but unissued				(93,000)	(50,498)
Purchase of treasury stock				(5,070)	(112,245)
Proceeds from issuance of preferred stock				62,966	0
Purchase of preferred stock				(1,335)	(960)
Cash dividends on common stock				(45,599)	(43,299)
Cash dividends on preferred stock				(4,957)	(3,777)
Net cash provided by financing activities				411,917	1,257,508
Net decrease in cash and cash equivalents				(621,853)	(127,693)
Cash and cash equivalents at beginning of period				1,032,067	602,245	602,245
Cash and cash equivalents at end of period	410,214	474,552	410,214	410,214	474,552	1,032,067
Supplemental disclosures of cash flow information:
Cash paid for interest				59,751	46,026
Cash paid for income taxes				58,975	57,167
Loans and bank premises transferred to other real estate owned				5,782	17,125
Capitalized mortgage servicing rights				9,853	5,844	8,253
Unsettled trades to sell securities	139,286		139,286	139,286		$ 0
Acquisition:
Fair value of assets acquired, including cash and cash equivalents	4,590	0	4,590	4,590	0
Fair value ascribed to goodwill and intangible assets	51,791	0	51,791	51,791	0
Fair value of liabilities assumed	$ 12,851	$ 0	$ 12,851	12,851	0
Common stock issued in acquisition				$ 43,530	$ 0

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the financial position, results of operations and comprehensive income, changes in stockholders’ equity, and cash flows of Associated Banc-Corp (individually referred to herein as the “Parent Company,” and together with all of its subsidiaries and affiliates, collectively referred to herein as the “Corporation”) for the periods presented, and all such adjustments are of a normal recurring nature. The consolidated financial statements include the accounts of all subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, goodwill impairment assessment, mortgage servicing rights valuation, and income taxes. Management has evaluated subsequent events for potential recognition or disclosure. During the third quarter of 2015, the Corporation reclassified approximately $500 million of closed end first lien home equity loans to residential mortgage loans in order to better align with the Corporation's regulatory reporting of residential mortgage loan products. All prior periods have been restated to reflect this change. As a result, the restated home equity loan portfolio is $1.1 billion for December 31, 2014 , compared to the originally reported amount of $1.6 billion . Similarly, the restated residential mortgage loan portfolio is $5.1 billion for December 31, 2014 , compared to the originally reported amount of $4.5 billion . During the fourth quarter of 2014, the Corporation changed the presentation of certain common stock repurchases included in the Consolidated Statements of Changes in Stockholders' Equity and the Consolidated Statements of Cash Flows. As a result, the common stock repurchases during the first nine months of 2014 have been reclassified to conform with this change in presentation.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisition	Acquisition On February 17, 2015, the Corporation acquired Ahmann & Martin Co., a risk and employee benefits consulting firm based in Minnesota. The firm merged into Associated Financial Group, LLC the Corporation's insurance brokerage subsidiary. The Corporation's acquisition of Ahmann & Martin Co. enhances the Corporation's ability to offer clients unique, comprehensive solutions to meet their insurance and financial risk management needs. The transaction was valued at approximately $48 million with the opportunity to increase the consideration by $8 million should certain contingencies be met over a defined period. The transaction was accounted for using the acquisition method of accounting and as such, assets acquired, liabilities assumed and consideration exchanged were recorded at their estimated fair value on the acquisition date. Goodwill from the acquisition represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired and is not deductible for tax purposes. As a result of the acquisition, the Corporation recorded goodwill of approximately $40 million and other intangible assets of approximately $12 million . Goodwill was assigned to the Corporation's Community, Consumer, and Business segment. See Note 8 for additional information on goodwill and other intangible assets.

New Accounting Pronouncements A

New Accounting Pronouncements Adopted	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted In June 2015, the FASB issued a technical corrections and improvements accounting standards update which makes minor amendments to the FASB Accounting Standards Codification. The four general topics covered in the guidance include: (1) amendments related to differences between original guidance and the codification, (2) guidance clarification and reference corrections, (3) simplification, and (4) minor improvements. The amendments that require transition guidance are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendments that require transition guidance are not applicable to the Corporation. All other amendments were effective upon the issuance of this update in June 2015. The Corporation adopted the accounting standard during the second quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In May 2015, the FASB issued an amendment to its current guidance regarding pushdown accounting for newly acquired businesses. The amendment eliminates the SEC guidance on pushdown accounting from the Accounting Standard Codification. The amendments align the FASB’s codification with the related material in the SEC's staff accounting bulletin (SAB) No. 115. SAB 115 rescinds portions of the interpretive guidance included in the SEC's Staff Accounting Bulletins series and brings existing guidance into conformity with ASU 2014-17, Pushdown Accounting, which provides an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. The Corporation adopted the accounting standard during the second quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In August 2014, the FASB issued an amendment to clarify how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. This amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure and (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 the 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. This amendment was effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2014. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In June 2014, the FASB issued an amendment to clarify the current accounting and disclosures for certain repurchase agreements. The amendments in this update require two accounting changes: (1) change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and (2) require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this update also require additional disclosures for certain transactions on the transfer of financial assets, as well as new disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. This amendment was effective for public business entities for the first interim or annual period beginning after December 15, 2014. The Corporation adopted the accounting standard during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. See Note 9 for the new repurchase agreement disclosures. In January 2014, the FASB issued an amendment to clarify that 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, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. This amendment was effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation adopted the accounting standard using the prospective transition method during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In January 2014, the FASB issued an amendment which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). For those investments in qualified affordable housing projects not accounted for using the proportional method, the investment should be accounted for as an equity method investment or a cost method investment. The decision to apply the proportional amortization method of accounting is an accounting policy decision that should be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. This amendment should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. This amendment was effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation made an accounting policy election to use the proportional amortization method for investments in qualified affordable housing projects during the first quarter of 2015, which had no material impact on its results of operations, financial position, or liquidity.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Earnings per share are calculated utilizing the two-class method. Basic earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding. Diluted earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding adjusted for the dilutive effect of common stock instruments (outstanding stock options, unvested restricted stock, and outstanding stock warrants). Presented below are the calculations for basic and diluted earnings per common share. Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 (In Thousands, except per share data) Net income $ 49,438 $ 50,207 $ 145,510 $ 141,771 Preferred stock dividends (2,184 ) (1,255 ) (4,957 ) (3,777 ) Net income available to common equity $ 47,254 $ 48,952 $ 140,553 $ 137,994 Common shareholder dividends (14,927 ) (13,983 ) (45,149 ) (42,864 ) Dividends on unvested share-based payment awards (164 ) (140 ) (450 ) (435 ) Undistributed earnings $ 32,163 $ 34,829 $ 94,954 $ 94,695 Undistributed earnings allocated to common shareholders $ 31,813 $ 34,481 $ 93,961 $ 93,862 Undistributed earnings allocated to unvested share-based payment awards 350 348 993 833 Undistributed earnings $ 32,163 $ 34,829 $ 94,954 $ 94,695 Basic Distributed earnings to common shareholders $ 14,927 $ 13,983 $ 45,149 $ 42,864 Undistributed earnings allocated to common shareholders 31,813 34,481 93,961 93,862 Total common shareholders earnings, basic $ 46,740 $ 48,464 $ 139,110 $ 136,726 Diluted Distributed earnings to common shareholders $ 14,927 $ 13,983 $ 45,149 $ 42,864 Undistributed earnings allocated to common shareholders 31,813 34,481 93,961 93,862 Total common shareholders earnings, diluted $ 46,740 $ 48,464 $ 139,110 $ 136,726 Weighted average common shares outstanding 148,614 155,925 149,524 159,090 Effect of dilutive common stock instruments 1,185 1,066 1,180 903 Diluted weighted average common shares outstanding 149,799 156,991 150,704 159,993 Basic earnings per common share $ 0.31 $ 0.31 $ 0.93 $ 0.86 Diluted earnings per common share $ 0.31 $ 0.31 $ 0.92 $ 0.85 Options to purchase approximately 1 million common shares were outstanding for both the three and nine months ended September 30, 2015 , respectively, but excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive. Options to purchase approximately 2 million and 3 million common shares were outstanding for the three and nine months ended September 30, 2014, respectively, but excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Stock-Based Compensation	Stock-Based Compensation At September 30, 2015 , the Corporation had one active stock-based compensation plan, the 2013 Incentive Compensation Plan. All stock options granted under this plan have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date. The Corporation also issues restricted common stock and restricted common stock units to certain key employees (collectively referred to as “restricted stock awards”) under this plan. The shares of restricted stock are restricted as to transfer, but are not restricted as to dividend payment or voting rights. Restricted stock units receive dividend equivalents but do not have voting rights. The transfer restrictions lapse over three or four years, depending upon whether the awards are service-based or performance-based. Service-based awards are contingent upon continued employment or meeting the requirements for retirement, and performance-based awards are based on earnings per share performance goals, relative total shareholder return, and continued employment or meeting the requirements for retirement. The plan provides that restricted stock awards and stock options will immediately become fully vested upon retirement from the Corporation of those colleagues whose retirement meets the early retirement or normal retirement definitions under the plan (“retirement eligible colleagues”). The fair value of stock options granted is estimated on the date of grant using a Black-Scholes option pricing model, while the fair value of restricted stock awards is their fair market value on the date of grant. The fair values of stock options and restricted stock awards are amortized as compensation expense on a straight-line basis over the vesting period of the grants. Beginning with the 2014 grants, expenses related to stock options and restricted stock awards are fully recognized on the date the colleague meets the definition of normal or early retirement. Compensation expense recognized is included in personnel expense in the consolidated statements of income. Assumptions are used in estimating the fair value of stock options granted. The weighted average expected life of the stock option represents the period of time that stock options are expected to be outstanding and is estimated using historical data of stock option exercises and forfeitures. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is based on the implied volatility of the Corporation’s stock. The following assumptions were used in estimating the fair value for options granted in the first nine months of 2015 and full year 2014 . 2015 2014 Dividend yield 2.00 % 2.00 % Risk-free interest rate 2.00 % 2.00 % Weighted average expected volatility 20.00 % 20.00 % Weighted average expected life 6 years 6 years Weighted average per share fair value of options $3.08 $3.00 The Corporation is required to estimate potential forfeitures of stock grants and adjust compensation expense recorded accordingly. The estimate of forfeitures will be adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from such estimates. Changes in estimated forfeitures will be recognized in the period of change and will also impact the amount of stock compensation expense to be recognized in future periods. A summary of the Corporation’s stock option activity for the year ended December 31, 2014 and for the nine months ended September 30, 2015 , is presented below. Stock Options Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (000s) Outstanding at December 31, 2013 8,034,243 $18.37 Granted 1,389,452 $17.45 Exercised (933,143 ) $13.77 Forfeited or expired (643,214 ) $23.50 Outstanding at December 31, 2014 7,847,338 $18.34 5.79 $ 23,986 Options exercisable at December 31, 2014 5,076,676 $19.96 4.41 $ 14,953 Granted 1,348,504 $17.95 Exercised (1,019,935 ) $13.85 Forfeited or expired (771,382 ) $27.19 Outstanding at September 30, 2015 7,404,525 $17.97 6.05 $ 15,962 Options exercisable at September 30, 2015 4,957,789 $18.38 4.73 $ 13,589 The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2014 , and for the nine months ended September 30, 2015 . Nonvested Stock Options Shares Weighted Average Grant Date Fair Value Nonvested at December 31, 2013 3,110,523 $4.69 Granted 1,389,452 $3.00 Vested (1,522,152 ) $4.92 Forfeited (207,161 ) $4.38 Nonvested at December 31, 2014 2,770,662 $3.74 Granted 1,348,504 $3.08 Vested (1,451,871 ) $4.20 Forfeited (220,559 ) $3.28 Nonvested at September 30, 2015 2,446,736 $3.15 Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock option. For the nine months ended September 30, 2015 , the intrinsic value of stock options exercised was $5 million . For the year ended December 31, 2014 , the intrinsic value of stock options exercised was $4 million . The total fair value of stock options that vested was $6 million for the nine months ended September 30, 2015 and $7 million for the year ended December 31, 2014 . The Corporation recognized compensation expense for the vesting of stock options of $3 million and $5 million for the nine months ended September 30, 2015 and 2014 , respectively. For the full year 2014 , the Corporation recognized compensation expense of $6 million for the vesting of stock options. Included in compensation expense for the nine months ended September 30, 2015 was approximately $690,000 of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At September 30, 2015 , the Corporation had $5 million of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominantly through fourth quarter 2018. The following table summarizes information about the Corporation’s restricted stock awards activity for the year ended December 31, 2014 , and for nine months ended September 30, 2015 . Restricted Stock Shares Weighted Average Grant Date Fair Value Outstanding at December 31, 2013 1,511,765 $13.92 Granted 1,177,168 $17.35 Vested (538,877 ) $14.12 Forfeited (167,930 ) $15.26 Outstanding at December 31, 2014 1,982,126 $15.79 Granted 1,165,087 $18.05 Vested (694,711 ) $15.59 Forfeited (171,293 ) $16.80 Outstanding at September 30, 2015 2,281,209 $17.01 Restricted stock awards granted during 2014 and 2015 will vest ratably over a four year period. Expense for restricted stock awards of approximately $12 million and $8 million was recognized for the nine months ended September 30, 2015 and 2014 , respectively. The Corporation recognized approximately $10 million of expense for restricted stock awards for the full year 2014 . Included in compensation expense for the nine months ended September 30, 2015 was approximately $2 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $26 million of unrecognized compensation expense related to restricted stock awards at September 30, 2015 that is expected to be recognized over the remaining requisite service periods that extend predominantly through fourth quarter 2018. The Corporation has the ability to issue shares from treasury or new shares upon the exercise of stock options or the granting of restricted stock awards. The Board of Directors has authorized management to repurchase shares of the Corporation’s common stock each quarter in the market, to be made available for issuance in connection with the Corporation’s employee incentive plans and for other corporate purposes. The repurchase of shares will be based on market and investment opportunities, capital levels, growth prospects, and regulatory constraints. Such repurchases may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs, or similar facilities.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are classified as held to maturity or available for sale at the time of purchase. The majority of the Corporation's investment securities are mortgage-related securities issued by government-sponsored enterprises ("GSE") such as the Government National Mortgage Association (“GNMA”), the Federal National Mortgage Association (“FNMA”), and the Federal Home Loan Mortgage Corporation (“FHLMC”). The amortized cost and fair values of investment securities available for sale and held to maturity were as follows. September 30, 2015: Amortized cost Gross unrealized gains Gross unrealized losses Fair value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities $ 999 $ 3 $ — $ 1,002 Obligations of state and political subdivisions ("municipal securities") 409,529 18,176 (4 ) 427,701 Residential mortgage-related securities: FNMA / FHLMC 1,932,740 52,232 (4,182 ) 1,980,790 GNMA 1,106,601 4,106 (2,574 ) 1,108,133 Private-label 1,755 1 (10 ) 1,746 GNMA commercial mortgage-related securities 1,885,776 6,461 (14,656 ) 1,877,581 Other securities (debt and equity) 6,640 63 — 6,703 Total investment securities available for sale $ 5,344,040 $ 81,042 $ (21,426 ) $ 5,403,656 Investment securities held to maturity: Municipal securities $ 604,799 $ 10,023 $ (1,450 ) $ 613,372 Total investment securities held to maturity $ 604,799 $ 10,023 $ (1,450 ) $ 613,372 December 31, 2014: Amortized Gross Gross Fair value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities $ 999 $ — $ (1 ) $ 998 Municipal securities 560,839 21,869 (29 ) 582,679 Residential mortgage-related securities: FNMA / FHLMC 3,534,240 59,640 (30,423 ) 3,563,457 GNMA 165,863 1,596 (127 ) 167,332 Private-label 2,297 7 (10 ) 2,294 GNMA commercial mortgage-related securities 1,097,913 1,922 (25,942 ) 1,073,893 Other securities (debt and equity) 6,108 51 — 6,159 Total investment securities available for sale $ 5,368,259 $ 85,085 $ (56,532 ) $ 5,396,812 Investment securities held to maturity: Municipal securities $ 404,455 $ 9,444 $ (832 ) $ 413,067 Total investment securities held to maturity $ 404,455 $ 9,444 $ (832 ) $ 413,067 The amortized cost and fair values of investment securities available for sale and held to maturity at September 30, 2015 , are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Available for Sale Held to Maturity ($ in Thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 39,763 $ 40,025 $ — $ — Due after one year through five years 236,730 248,772 3,980 4,042 Due after five years through ten years 140,072 145,956 133,801 136,164 Due after ten years 585 599 467,018 473,166 Total debt securities 417,150 435,352 604,799 613,372 Residential mortgage-related securities: FNMA / FHLMC 1,932,740 1,980,790 — — GNMA 1,106,601 1,108,133 — — Private-label 1,755 1,746 — — GSE commercial mortgage-related securities 1,885,776 1,877,581 — — Equity securities 18 54 — — Total investment securities $ 5,344,040 $ 5,403,656 $ 604,799 $ 613,372 Ratio of Fair Value to Amortized Cost 101.1 % 101.4 % During the second and third quarters of 2015, the Corporation restructured its investment portfolio and sold over $1 billion of FNMA and FHLMC mortgage-related securities and reinvested into GNMA mortgage-related securities, generating a $4 million net gain on sale. This restructuring lowered risk weighted assets and related capital requirements, while improving the liquidity of the investment portfolio. The $1.2 billion of proceeds from the sales of investment securities includes a $139 million receivable due to an unsettled trade from the sale of investment securities that occurred at the end of September. Nine Months Ended September 30, Year Ended December 31, 2015 2014 2014 ($ in Thousands) Gross gains $ 8,047 $ 1,159 $ 1,184 Gross losses (4,009 ) (690 ) (690 ) Investment securities gains, net $ 4,038 $ 469 $ 494 Proceeds from sales of investment securities $ 1,206,242 $ 101,987 $ 102,011 The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2015 . Less than 12 months 12 months or more Total September 30, 2015 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: Municipal securities 2 $ (2 ) $ 628 1 $ (2 ) $ 186 $ (4 ) $ 814 Residential mortgage-related securities: GSE 51 (2,894 ) 854,924 20 (3,862 ) 374,787 (6,756 ) 1,229,711 Private-label 1 — 90 3 (10 ) 1,591 (10 ) 1,681 GSE commercial mortgage-related securities 15 (1,411 ) 526,820 20 (13,245 ) 445,030 (14,656 ) 971,850 Total $ (4,307 ) $ 1,382,462 $ (17,119 ) $ 821,594 $ (21,426 ) $ 2,204,056 Investment securities held to maturity: Municipal securities 244 $ (1,180 ) $ 112,223 20 $ (270 ) $ 9,405 $ (1,450 ) $ 121,628 Total $ (1,180 ) $ 112,223 $ (270 ) $ 9,405 $ (1,450 ) $ 121,628 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2014 . Less than 12 months 12 months or more Total December 31, 2014 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities 1 $ (1 ) $ 998 — $ — $ — $ (1 ) $ 998 Municipal securities 6 (9 ) 3,374 6 (20 ) 2,133 (29 ) 5,507 Residential mortgage-related securities: GSE 16 (1,404 ) 333,713 56 (29,146 ) 1,256,533 (30,550 ) 1,590,246 Private-label 1 (9 ) 1,772 2 (1 ) 27 (10 ) 1,799 GSE commercial mortgage-related securities 9 (1,766 ) 329,982 20 (24,176 ) 460,425 (25,942 ) 790,407 Total $ (3,189 ) $ 669,839 $ (53,343 ) $ 1,719,118 $ (56,532 ) $ 2,388,957 Investment securities held to maturity: Municipal securities 74 $ (216 ) $ 31,924 85 $ (616 ) $ 38,915 $ (832 ) $ 70,839 Total $ (216 ) $ 31,924 $ (616 ) $ 38,915 $ (832 ) $ 70,839 The Corporation reviews the investment securities portfolio on a quarterly basis to monitor its exposure to other-than-temporary impairment. A determination as to whether a security’s decline in fair value is other-than-temporary takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in the other-than-temporary impairment analysis include, the length of time and extent to which the security has been in an unrealized loss position, changes in security ratings, financial condition and near-term prospects of the issuer, as well as security and industry specific economic conditions. The Corporation may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds, and the value of any underlying collateral for certain securities. Based on the Corporation’s evaluation, management does not believe any unrealized loss at September 30, 2015 represents an other-than-temporary impairment as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions, and not credit deterioration. The unrealized losses reported for municipal securities relate to various state and local political subdivisions and school districts. The Corporation currently does not intend to sell nor does it believe that it will be required to sell the securities contained in the above unrealized losses table before recovery of their amortized cost basis. The improvement in the unrealized loss position of the investment securities portfolio was due to a reduction in the level of intermediate term interest rates from December 31, 2014 to September 30, 2015 . Since December 31, 2014 , the three-year and five-year U.S. Treasury note rates declined 18 basis points ("bp") and 28 bp, respectively. Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank Stocks : The Corporation is required to maintain Federal Reserve stock and FHLB stock as a member of both the Federal Reserve System and the FHLB, and in amounts as required by these institutions. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other marketable equity securities and their fair value is equal to amortized cost. The Corporation had FHLB stock of $88 million and $118 million at September 30, 2015 and December 31, 2014 , respectively, and Federal Reserve Bank stock of $73 million and $71 million at September 30, 2015 and December 31, 2014 , respectively. During second quarter of 2015 , the Corporation purchased $14 million of additional FHLB stock to support the overall increase in FHLB advances and subsequently sold $43 million of excess FHLB stock.

Loans, Allowance for Credit Los

Loans, Allowance for Credit Losses, and Credit Quality	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans, Allowance for Credit Losses, and Credit Quality	NOTE 7: Loans, Allowance for Credit Losses, and Credit Quality During the third quarter of 2015, the Corporation reclassified approximately $500 million of closed end first lien home equity loans to residential mortgage loans in order to better align with the Corporation's regulatory reporting of residential mortgage loan products. All prior periods have been restated to reflect this change. As a result, the restated home equity loan portfolio is $1.1 billion for December 31, 2014 , compared to the originally reported amount of $1.6 billion . Similarly, the restated residential mortgage loan portfolio is $5.1 billion for December 31, 2014 , compared to the originally reported amount of $4.5 billion . The period end loan composition was as follows. September 30, December 31, ($ in Thousands) Commercial and industrial $ 6,085,473 $ 5,905,902 Commercial real estate - owner occupied 966,689 1,007,937 Lease financing 42,607 51,529 Commercial and business lending 7,094,769 6,965,368 Commercial real estate - investor 3,183,352 3,056,485 Real estate construction 1,124,280 1,008,956 Commercial real estate lending 4,307,632 4,065,441 Total commercial 11,402,401 11,030,809 Home equity 1,014,465 1,051,927 Installment and credit cards 425,729 454,219 Residential mortgage 5,682,178 5,056,891 Total consumer 7,122,372 6,563,037 Total loans $ 18,524,773 $ 17,593,846 A summary of the changes in the allowance for credit losses was as follows. Nine Months Ended Year Ended ($ in Thousands) Allowance for Loan Losses: Balance at beginning of period $ 266,302 $ 268,315 Provision for loan losses 18,500 13,000 Charge offs (39,539 ) (44,096 ) Recoveries 17,273 29,083 Net charge offs (22,266 ) (15,013 ) Balance at end of period $ 262,536 $ 266,302 Allowance for Unfunded Commitments: Balance at beginning of period $ 24,900 $ 21,900 Provision for unfunded commitments (1,000 ) 3,000 Balance at end of period $ 23,900 $ 24,900 Allowance for Credit Losses $ 286,436 $ 291,202 The level of the allowance for loan losses represents management’s estimate of an amount appropriate to provide for probable credit losses in the loan portfolio at the balance sheet date. In general, the change in the allowance for loan losses is a function of a number of factors, including but not limited to changes in the loan portfolio, net charge offs, trends in past due and impaired loans, and the level of potential problem loans. Management considers the allowance for loan losses a critical accounting policy, as assessing these numerous factors involves significant judgment. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit) and is included in accrued expenses and other liabilities on the consolidated balance sheets. The determination of the appropriate level of the allowance for unfunded commitments is based upon an evaluation of the unfunded credit facilities, including an assessment of historical commitment utilization experience and credit risk grading of the loan. Net adjustments to the allowance for unfunded commitments are included in provision for credit losses in the consolidated statements of income. See Note 13 for additional information on the allowance for unfunded commitments. A summary of the changes in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2015 , was as follows. $ in Thousands Commercial and industrial Commercial real estate - owner occupied Lease financing Commercial real estate - investor Real estate construction Home equity Installment and credit cards Residential mortgage Total Balance at Dec 31, 2014 $ 116,025 $ 16,510 $ 1,610 $ 46,333 $ 20,999 $ 26,464 $ 6,435 $ 31,926 $ 266,302 Provision for loan losses 15,749 7,245 (835 ) (2,703 ) (1,314 ) (987 ) 1,284 61 18,500 Charge offs (19,672 ) (2,325 ) — (3,947 ) (546 ) (5,466 ) (2,934 ) (4,649 ) (39,539 ) Recoveries 6,392 892 — 4,124 1,924 2,568 569 804 17,273 Balance at Sep 30, 2015 $ 118,494 $ 22,322 $ 775 $ 43,807 $ 21,063 $ 22,579 $ 5,354 $ 28,142 $ 262,536 Allowance for loan losses: Ending balance impaired loans individually evaluated for impairment $ 5,922 $ — $ — $ 197 $ — $ 3 $ — $ 171 $ 6,293 Ending balance impaired loans collectively evaluated for impairment 977 571 — 1,152 474 9,652 210 12,384 25,420 Total impaired loans $ 6,899 $ 571 $ — $ 1,349 $ 474 $ 9,655 $ 210 $ 12,555 $ 31,713 Ending balance all other loans collectively evaluated for impairment 111,595 21,751 775 42,458 20,589 12,924 5,144 15,587 230,823 Total $ 118,494 $ 22,322 $ 775 $ 43,807 $ 21,063 $ 22,579 $ 5,354 $ 28,142 $ 262,536 Loans: Ending balance impaired loans individually evaluated for impairment $ 55,148 $ 11,174 $ 1,763 $ 3,822 $ — $ 170 $ — $ 6,877 $ 78,954 Ending balance impaired loans collectively evaluated for impairment 31,871 9,537 — 21,679 1,482 20,416 1,190 65,134 151,309 Total impaired loans $ 87,019 $ 20,711 $ 1,763 $ 25,501 $ 1,482 $ 20,586 $ 1,190 $ 72,011 $ 230,263 Ending balance all other loans collectively evaluated for impairment 5,998,454 945,978 40,844 3,157,851 1,122,798 993,879 424,539 5,610,167 18,294,510 Total $ 6,085,473 $ 966,689 $ 42,607 $ 3,183,352 $ 1,124,280 $ 1,014,465 $ 425,729 $ 5,682,178 $ 18,524,773 The allocation methodology used by the Corporation includes allocations for specifically identified impaired loans and loss factor allocations (used for both criticized and non-criticized loan categories), with a component primarily based on historical loss rates and a component primarily based on other qualitative factors. Management allocates the allowance for loan losses by pools of risk within each loan portfolio. The allocation of the allowance for loan losses by loan portfolio is made for analytical purposes and is not necessarily indicative of the trend of future loan losses in any particular category. At September 30, 2015 , $29 million of the commercial and industrial allowance for loan losses was attributable to Oil and Gas related credits, compared to $17 million at December 31, 2014 . This allocated allowance for loan losses represented 3.83% and 2.26% of period end Oil and Gas related loans at September 30, 2015 and December 31, 2014 , respectively. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio. For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2014 , was as follows. $ in Thousands Commercial and industrial Commercial real estate - owner occupied Lease financing Commercial real estate - investor Real estate construction Home equity Installment and credit cards Residential mortgage Total Balance at Dec 31, 2013 $ 104,501 $ 19,476 $ 1,607 $ 58,156 $ 23,418 $ 27,932 $ 2,416 $ 30,809 $ 268,315 Provision for loan losses 14,767 (1,296 ) 35 (17,290 ) (1,277 ) 6,278 6,279 5,504 13,000 Charge offs (14,633 ) (3,476 ) (39 ) (4,529 ) (1,958 ) (10,946 ) (2,876 ) (5,639 ) (44,096 ) Recoveries 11,390 1,806 7 9,996 816 3,200 616 1,252 29,083 Balance at Dec 31, 2014 $ 116,025 $ 16,510 $ 1,610 $ 46,333 $ 20,999 $ 26,464 $ 6,435 $ 31,926 $ 266,302 Allowance for loan losses: Ending balance impaired loans individually evaluated for impairment $ 13,615 $ 1,490 $ 574 $ 1,649 $ 328 $ 11 $ — $ 199 $ 17,866 Ending balance impaired loans collectively evaluated for impairment 2,852 1,731 — 1,938 767 11,371 308 13,598 32,565 Total impaired loans $ 16,467 $ 3,221 $ 574 $ 3,587 $ 1,095 $ 11,382 $ 308 $ 13,797 $ 50,431 Ending balance all other loans collectively evaluated for impairment 99,558 13,289 1,036 42,746 19,904 15,082 6,127 18,129 215,871 Total $ 116,025 $ 16,510 $ 1,610 $ 46,333 $ 20,999 $ 26,464 $ 6,435 $ 31,926 $ 266,302 Loans: Ending balance impaired loans individually evaluated for impairment $ 45,118 $ 20,731 $ 1,801 $ 19,683 $ 3,776 $ 962 $ — $ 9,751 $ 101,822 Ending balance impaired loans collectively evaluated for impairment 38,437 15,548 — 26,129 2,350 23,698 1,587 66,058 173,807 Total impaired loans $ 83,555 $ 36,279 $ 1,801 $ 45,812 $ 6,126 $ 24,660 $ 1,587 $ 75,809 $ 275,629 Ending balance all other loans collectively evaluated for impairment 5,822,347 971,658 49,728 3,010,673 1,002,830 1,027,267 452,632 4,981,082 17,318,217 Total $ 5,905,902 $ 1,007,937 $ 51,529 $ 3,056,485 $ 1,008,956 $ 1,051,927 $ 454,219 $ 5,056,891 $ 17,593,846 The following table presents commercial loans by credit quality indicator at September 30, 2015 . Pass Special Mention Potential Problem Impaired Total ($ in Thousands) Commercial and industrial $ 5,487,926 $ 318,587 $ 191,941 $ 87,019 $ 6,085,473 Commercial real estate - owner occupied 874,566 29,946 41,466 20,711 966,689 Lease financing 39,987 624 233 1,763 42,607 Commercial and business lending 6,402,479 349,157 233,640 109,493 7,094,769 Commercial real estate - investor 3,089,760 44,458 23,633 25,501 3,183,352 Real estate construction 1,120,173 271 2,354 1,482 1,124,280 Commercial real estate lending 4,209,933 44,729 25,987 26,983 4,307,632 Total commercial $ 10,612,412 $ 393,886 $ 259,627 $ 136,476 $ 11,402,401 The following table presents commercial loans by credit quality indicator at December 31, 2014 . Pass Special Mention Potential Problem Impaired Total ($ in Thousands) Commercial and industrial $ 5,594,497 $ 119,328 $ 108,522 $ 83,555 $ 5,905,902 Commercial real estate - owner occupied 904,526 18,437 48,695 36,279 1,007,937 Lease financing 46,931 88 2,709 1,801 51,529 Commercial and business lending 6,545,954 137,853 159,926 121,635 6,965,368 Commercial real estate - investor 2,974,493 12,137 24,043 45,812 3,056,485 Real estate construction 998,972 2,082 1,776 6,126 1,008,956 Commercial real estate lending 3,973,465 14,219 25,819 51,938 4,065,441 Total commercial $ 10,519,419 $ 152,072 $ 185,745 $ 173,573 $ 11,030,809 The following table presents consumer loans by credit quality indicator at September 30, 2015 . Performing 30-89 Days Past Due Potential Problem Impaired Total ($ in Thousands) Home equity $ 985,087 $ 8,565 $ 227 $ 20,586 $ 1,014,465 Installment and credit cards 422,816 1,723 — 1,190 425,729 Residential mortgage 5,601,390 4,811 3,966 72,011 5,682,178 Total consumer $ 7,009,293 $ 15,099 $ 4,193 $ 93,787 $ 7,122,372 The following table presents consumer loans by credit quality indicator at December 31, 2014 . Performing 30-89 Days Past Due Potential Problem Impaired Total ($ in Thousands) Home equity $ 1,017,604 $ 8,783 $ 880 $ 24,660 $ 1,051,927 Installment and credit cards 450,698 1,932 2 1,587 454,219 Residential mortgage 4,972,455 4,846 3,781 75,809 5,056,891 Total consumer $ 6,440,757 $ 15,561 $ 4,663 $ 102,056 $ 6,563,037 Factors that are important to managing overall credit quality are sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, and appropriate allowance for loan losses, allowance for unfunded commitments, nonaccrual and charge off policies. For commercial loans, management has determined the pass credit quality indicator to include credits that exhibit acceptable financial statements, cash flow, and leverage. If any risk exists, it is mitigated by the loan structure, collateral, monitoring, or control. For consumer loans, performing loans include credits that are performing in accordance with the original contractual terms. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Special mention credits have potential weaknesses that deserve management’s attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Potential problem loans are considered inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged. These loans generally have a well-defined weakness, or weaknesses that may jeopardize liquidation of the debt and are characterized by the distinct possibility that the Corporation will sustain some loss if the deficiencies are not corrected. Lastly, management considers a loan to be impaired when it is probable that the Corporation will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that commercial and consumer loan relationships that have nonaccrual status or have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. Commercial loans classified as special mention, potential problem, and impaired are reviewed at a minimum on a quarterly basis, while pass rated credits are reviewed on an annual basis or more frequently if the loan renewal is less than one year or if otherwise warranted. The following table presents loans by past due status at September 30, 2015 . 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Total Past Due Current Total ($ in Thousands) Accruing loans Commercial and industrial $ 1,133 $ 1,788 $ 178 $ 3,099 $ 6,023,953 $ 6,027,052 Commercial real estate - owner occupied 1,173 845 — 2,018 951,303 953,321 Lease financing 375 — — 375 40,469 40,844 Commercial and business lending 2,681 2,633 178 5,492 7,015,725 7,021,217 Commercial real estate - investor 1,104 114 — 1,218 3,175,213 3,176,431 Real estate construction 312 61 — 373 1,122,910 1,123,283 Commercial real estate lending 1,416 175 — 1,591 4,298,123 4,299,714 Total commercial 4,097 2,808 178 7,083 11,313,848 11,320,931 Home equity 7,413 1,152 — 8,565 992,259 1,000,824 Installment and credit cards 1,162 561 1,306 3,029 422,314 425,343 Residential mortgage 4,345 466 — 4,811 5,625,410 5,630,221 Total consumer 12,920 2,179 1,306 16,405 7,039,983 7,056,388 Total accruing loans $ 17,017 $ 4,987 $ 1,484 $ 23,488 $ 18,353,831 $ 18,377,319 Nonaccrual loans Commercial and industrial $ 27 $ 1,379 $ 9,711 $ 11,117 $ 47,304 $ 58,421 Commercial real estate - owner occupied 195 — 3,641 3,836 9,532 13,368 Lease financing — — — — 1,763 1,763 Commercial and business lending 222 1,379 13,352 14,953 58,599 73,552 Commercial real estate - investor — — 3,565 3,565 3,356 6,921 Real estate construction 61 108 445 614 383 997 Commercial real estate lending 61 108 4,010 4,179 3,739 7,918 Total commercial 283 1,487 17,362 19,132 62,338 81,470 Home equity 1,899 1,228 4,744 7,871 5,770 13,641 Installment and credit cards 47 23 164 234 152 386 Residential mortgage 4,675 4,215 19,946 28,836 23,121 51,957 Total consumer 6,621 5,466 24,854 36,941 29,043 65,984 Total nonaccrual loans (b) $ 6,904 $ 6,953 $ 42,216 $ 56,073 $ 91,381 $ 147,454 Total loans Commercial and industrial $ 1,160 $ 3,167 $ 9,889 $ 14,216 $ 6,071,257 $ 6,085,473 Commercial real estate - owner occupied 1,368 845 3,641 5,854 960,835 966,689 Lease financing 375 — — 375 42,232 42,607 Commercial and business lending 2,903 4,012 13,530 20,445 7,074,324 7,094,769 Commercial real estate - investor 1,104 114 3,565 4,783 3,178,569 3,183,352 Real estate construction 373 169 445 987 1,123,293 1,124,280 Commercial real estate lending 1,477 283 4,010 5,770 4,301,862 4,307,632 Total commercial 4,380 4,295 17,540 26,215 11,376,186 11,402,401 Home equity 9,312 2,380 4,744 16,436 998,029 1,014,465 Installment and credit cards 1,209 584 1,470 3,263 422,466 425,729 Residential mortgage 9,020 4,681 19,946 33,647 5,648,531 5,682,178 Total consumer 19,541 7,645 26,160 53,346 7,069,026 7,122,372 Total loans $ 23,921 $ 11,940 $ 43,700 $ 79,561 $ 18,445,212 $ 18,524,773 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $1 million at September 30, 2015 (the same as the reported balances for the accruing loans noted above). (b) The percent of nonaccrual loans which are current was 62% at September 30, 2015 . The following table presents loans by past due status at December 31, 2014 . 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Total Past Due Current Total ($ in Thousands) Accruing loans Commercial and industrial $ 4,466 $ 10,281 $ 254 $ 15,001 $ 5,841,238 $ 5,856,239 Commercial real estate - owner occupied 8,429 2,199 — 10,628 971,484 982,112 Lease financing — — — — 49,728 49,728 Commercial and business lending 12,895 12,480 254 25,629 6,862,450 6,888,079 Commercial real estate - investor 712 496 — 1,208 3,032,592 3,033,800 Real estate construction 951 33 — 984 1,002,573 1,003,557 Commercial real estate lending 1,663 529 — 2,192 4,035,165 4,037,357 Total commercial 14,558 13,009 254 27,821 10,897,615 10,925,436 Home equity 6,988 1,795 52 8,835 1,026,641 1,035,476 Installment and credit cards 1,186 746 1,317 3,249 450,357 453,606 Residential mortgage 3,889 957 — 4,846 4,997,069 5,001,915 Total consumer 12,063 3,498 1,369 16,930 6,474,067 6,490,997 Total accruing loans $ 26,621 $ 16,507 $ 1,623 $ 44,751 $ 17,371,682 $ 17,416,433 Nonaccrual loans Commercial and industrial $ 872 $ 627 $ 10,154 $ 11,653 $ 38,010 $ 49,663 Commercial real estate - owner occupied 3,197 41 8,596 11,834 13,991 25,825 Lease financing — — 513 513 1,288 1,801 Commercial and business lending 4,069 668 19,263 24,000 53,289 77,289 Commercial real estate - investor 1,857 459 12,765 15,081 7,604 22,685 Real estate construction 87 73 798 958 4,441 5,399 Commercial real estate lending 1,944 532 13,563 16,039 12,045 28,084 Total commercial 6,013 1,200 32,826 40,039 65,334 105,373 Home equity 1,471 1,766 6,840 10,077 6,374 16,451 Installment and credit cards 96 39 141 276 337 613 Residential mortgage 5,172 3,193 23,492 31,857 23,119 54,976 Total consumer 6,739 4,998 30,473 42,210 29,830 72,040 Total nonaccrual loans (b) $ 12,752 $ 6,198 $ 63,299 $ 82,249 $ 95,164 $ 177,413 Total loans Commercial and industrial $ 5,338 $ 10,908 $ 10,408 $ 26,654 $ 5,879,248 $ 5,905,902 Commercial real estate - owner occupied 11,626 2,240 8,596 22,462 985,475 1,007,937 Lease financing — — 513 513 51,016 51,529 Commercial and business lending 16,964 13,148 19,517 49,629 6,915,739 6,965,368 Commercial real estate - investor 2,569 955 12,765 16,289 3,040,196 3,056,485 Real estate construction 1,038 106 798 1,942 1,007,014 1,008,956 Commercial real estate lending 3,607 1,061 13,563 18,231 4,047,210 4,065,441 Total commercial 20,571 14,209 33,080 67,860 10,962,949 11,030,809 Home equity 8,459 3,561 6,892 18,912 1,033,015 1,051,927 Installment and credit cards 1,282 785 1,458 3,525 450,694 454,219 Residential mortgage 9,061 4,150 23,492 36,703 5,020,188 5,056,891 Total consumer 18,802 8,496 31,842 59,140 6,503,897 6,563,037 Total loans $ 39,373 $ 22,705 $ 64,922 $ 127,000 $ 17,466,846 $ 17,593,846 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2014 (the same as the reported balances for the accruing loans noted above). (b) The percent of nonaccrual loans which are current was 54% at December 31, 2014 . The following table presents impaired loans at September 30, 2015 . Recorded Investment Unpaid Principal Balance Related Allowance YTD Average Recorded Investment YTD Interest Income Recognized (a) ($ in Thousands) Loans with a related allowance Commercial and industrial $ 58,855 $ 60,303 $ 6,899 $ 59,502 $ 970 Commercial real estate - owner occupied 9,537 9,660 571 9,784 274 Lease financing — — — — — Commercial and business lending 68,392 69,963 7,470 69,286 1,244 Commercial real estate - investor 23,916 25,594 1,349 24,119 834 Real estate construction 1,482 2,112 474 1,643 42 Commercial real estate lending 25,398 27,706 1,823 25,762 876 Total commercial 93,790 97,669 9,293 95,048 2,120 Home equity 20,526 22,682 9,655 21,207 816 Installment and credit cards 1,190 1,292 210 1,252 25 Residential mortgage 67,333 72,537 12,555 68,551 1,731 Total consumer 89,049 96,511 22,420 91,010 2,572 Total loans $ 182,839 $ 194,180 $ 31,713 $ 186,058 $ 4,692 Loans with no related allowance Commercial and industrial $ 28,164 $ 29,187 $ — $ 32,848 $ 548 Commercial real estate - owner occupied 11,174 11,571 — 11,594 89 Lease financing 1,763 1,763 — 1,980 — Commercial and business lending 41,101 42,521 — 46,422 637 Commercial real estate - investor 1,585 1,675 — 1,596 34 Real estate construction — — — — — Commercial real estate lending 1,585 1,675 — 1,596 34 Total commercial 42,686 44,196 — 48,018 671 Home equity 60 60 — 60 1 Installment and credit cards — — — — — Residential mortgage 4,678 4,932 — 4,700 57 Total consumer 4,738 4,992 — 4,760 58 Total loans $ 47,424 $ 49,188 $ — $ 52,778 $ 729 Total impaired loans Commercial and industrial $ 87,019 $ 89,490 $ 6,899 $ 92,350 $ 1,518 Commercial real estate - owner occupied 20,711 21,231 571 21,378 363 Lease financing 1,763 1,763 — 1,980 — Commercial and business lending 109,493 112,484 7,470 115,708 1,881 Commercial real estate - investor 25,501 27,269 1,349 25,715 868 Real estate construction 1,482 2,112 474 1,643 42 Commercial real estate lending 26,983 29,381 1,823 27,358 910 Total commercial 136,476 141,865 9,293 143,066 2,791 Home equity 20,586 22,742 9,655 21,267 817 Installment and credit cards 1,190 1,292 210 1,252 25 Residential mortgage 72,011 77,469 12,555 73,251 1,788 Total consumer 93,787 101,503 22,420 95,770 2,630 Total impaired loans (b) $ 230,263 $ 243,368 $ 31,713 $ 238,836 $ 5,421 (a) Interest income recognized included $3 million of interest income recognized on accruing restructured loans for the nine months ended September 30, 2015 . (b) The implied fair value mark on all impaired loans at September 30, 2015 was 82% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance. The following table presents impaired loans at December 31, 2014 . Recorded Investment Unpaid Principal Balance Related Allowance YTD Average Recorded Investment YTD Interest Income Recognized (a) ($ in Thousands) Loans with a related allowance Commercial and industrial $ 76,433 $ 80,414 $ 16,467 $ 80,004 $ 3,139 Commercial real estate - owner occupied 19,839 21,807 3,221 20,878 681 Lease financing 1,801 1,801 574 2,009 — Commercial and business lending 98,073 104,022 20,262 102,891 3,820 Commercial real estate - investor 36,841 40,869 3,587 38,657 1,250 Real estate construction 3,043 5,910 1,095 3,818 105 Commercial real estate lending 39,884 46,779 4,682 42,475 1,355 Total commercial 137,957 150,801 24,944 145,366 5,175 Home equity 23,874 26,585 11,382 25,087 1,257 Installment and credit cards 1,587 1,795 308 1,736 58 Residential mortgage 68,748 74,005 13,797 70,030 2,307 Total consumer 94,209 102,385 25,487 96,853 3,622 Total loans $ 232,166 $ 253,186 $ 50,431 $ 242,219 $ 8,797 Loans with no related allowance Commercial and industrial $ 7,122 $ 12,634 $ — $ 8,851 $ 82 Commercial real estate - owner occupied 16,440 19,019 — 17,970 219 Lease financing — — — — — Commercial and business lending 23,562 31,653 — 26,821 301 Commercial real estate - investor 8,971 14,036 — 10,014 133 Real estate construction 3,083 3,815 — 3,241 — Commercial real estate lending 12,054 17,851 — 13,255 133 Total commercial 35,616 49,504 — 40,076 434 Home equity 786 806 — 851 18 Installment and credit cards — — — — — Residential mortgage 7,061 7,315 — 7,224 135 Total consumer 7,847 8,121 — 8,075 153 Total loans $ 43,463 $ 57,625 $ — $ 48,151 $ 587 Total impaired loans Commercial and industrial $ 83,555 $ 93,048 $ 16,467 $ 88,855 $ 3,221 Commercial real estate - owner occupied 36,279 40,826 3,221 38,848 900 Lease financing 1,801 1,801 574 2,009 — Commercial and business lending 121,635 135,675 20,262 129,712 4,121 Commercial real estate - investor 45,812 54,905 3,587 48,671 1,383 Real estate construction 6,126 9,725 1,095 7,059 105 Commercial real estate lending 51,938 64,630 4,682 55,730 1,488 Total commercial 173,573 200,305 24,944 185,442 5,609 Home equity 24,660 27,391 11,382 25,938 1,275 Installment and credit cards 1,587 1,795 308 1,736 58 Residential mortgage 75,809 81,320 13,797 77,254 2,442 Total consumer 102,056 110,506 25,487 104,928 3,775 Total impaired loans (b) $ 275,629 $ 310,811 $ 50,431 $ 290,370 $ 9,384 (a) Interest income recognized included $5 million of interest income recognized on accruing restructured loans for the year ended December 31, 2014 . (b) The implied fair value mark on all impaired loans at December 31, 2014 was 72% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal. While a loan is in nonaccrual status, some or all of the cash interest payments received may be treated as interest income on a cash basis as long as the remaining recorded investment in the asset (i.e., after charge off of identified losses, if any) is deemed to be fully collectible. The determination as to the ultimate collectability of the asset’s remaining recorded investment must be supported by a current, well documented, credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months. Troubled Debt Restructurings (“Restructured Loans”) Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. In addition, all accruing restructured loans are reported as troubled debt restructurings, which are considered and accounted for as impaired loans. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. The Corporation had an $18 million recorded investment in loans modified in troubled debt restructurings for the nine months ended September 30, 2015 , of which $2 million was in accrual status and $16 million was in nonaccrual pending a sustained period of repayment. All restructured loans are disclosed as restructured loans in the calendar year of restructuring. In subsequent years, a restructured loan modified at a market rate that has performed according to the modified terms for at least six months will cease being disclosed as a restructured loan. A loan that has been modified at a below market rate will return to performing status if it satisfies the six month performance requirement; however, it will remain classified as a restructured loan. The following table presents nonaccrual and performing restructured loans by loan portfolio. September 30, 2015 December 31, 2014 Performing Restructured Loans Nonaccrual Restructured Loans * Performing Restructured Loans Nonaccrual Restructured Loans * ($ in Thousands) Commercial and industrial $ 28,598 $ 1,946 $ 33,892 $ 3,260 Commercial real estate - owner occupied 7,343 2,796 10,454 5,656 Commercial real estate - investor 18,580 4,268 23,127 15,216 Real estate construction 485 173 727 2,438 Home equity 6,945 4,137 8,209 4,838 Installment and credit cards 804 65 974 199 Residential mortgage 20,054 23,198 20,833 26,049 Total $ 82,809 $ 36,583 $ 98,216 $ 57,656 * Nonaccrual restructured loans have been included with nonaccrual loans. The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio for the three and nine months ended September 30, 2015 , and the recorded investment and unpaid principal balance as of September 30, 2015 . Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) ($ in Thousands) Commercial and industrial 5 $ 893 $ 896 10 $ 2,410 $ 3,033 Commercial real estate - owner occupied — — — 4 2,847 3,007 Commercial real estate - investor 2 711 761 3 2,949 2,998 Real estate construction — — — 1 5 5 Home equity 27 840 940 61 2,109 2,220 Residential mortgage 33 2,612 2,721 77 7,393 7,586 Total 67 $ 5,056 $ 5,318 156 $ 17,713 $ 18,849 (1) Represents post-modification outstanding recorded investment. (2) Represents pre-modification outstanding recorded investment. The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio for the three and nine months ended September 30, 2014 , and the recorded investment and unpaid principal balance as of September 30, 2014 . Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) ($ in Thousands) Commercial and industrial 10 $ 7,383 $ 7,384 13 $ 7,695 $ 7,707 Commercial real estate - owner occupied — — — 2 1,123 1,260 Commercial real estate - investor 3 5,603 5,918 4 6,096 6,425 Real estate construction 1 8 8 2 14 14 Home equity 38 1,121 1,179 85 2,784 2,970 Installment and credit cards 2 25 25 3 34 45 Residential mortgage 49 4,364 4,654 94 8,627 9,178 Total 103 $ 18,504 $ 19,168 203 $ 26,373 $ 27,599 (1) Represents post-modification outstanding recorded investment. (2) Represents pre-modification outstanding recorded investment. Restructured loan modifications may include payment schedule modifications, interest rate concessions, maturity date extensions, modification of note structure (A/B Note), non-reaffirmed Chapter 7 bankruptcies, principal reduction, or some combination of these concessions. During the three and nine months ended September 30, 2015 , restructured loan modifications of commercial and industrial, commercial real estate and real estate construction loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of home equity and residential mortgage loans for the three and nine months ended September 30, 2015 primarily included maturity date extensions, interest rate concessions, payment schedule modifications, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions. The following table provides the number of loans modified in a troubled debt restructuring during the previous 12 months which subsequently defaulte

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill Goodwill is not amortized but, instead, is subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired and “step two” is not considered necessary. If the carrying value of a reporting unit exceeds its calculated fair value, the impairment test continues (“step two”) by comparing the carrying value of the reporting unit’s goodwill to the implied fair value of goodwill. The implied fair value is computed by adjusting all assets and liabilities of the reporting unit to current fair value with the offset adjustment to goodwill. The adjusted goodwill balance is the implied fair value of the goodwill. An impairment charge is recognized if the carrying value of goodwill exceeds the implied fair value of goodwill. The Corporation conducted its most recent annual impairment test in May 2015, utilizing a qualitative assessment. Factors that management considered in this assessment included macroeconomic conditions, industry and market considerations, overall financial performance of the Corporation and each reporting unit (both current and projected), changes in management strategy, and changes in the composition or carrying amount of net assets. In addition, management considered the increases in both the Corporation’s common stock price and in the overall bank common stock index (based on the NASDAQ Bank Index and the S&P 400 Regional Bank Sub-Industry Index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2015 annual qualitative impairment assessment indicated that it is more likely than not that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, a step one quantitative analysis was not required. There were no events since the date of the last impairment testing that have changed the Corporation's impairment assessment conclusion. At September 30, 2015 , the Corporation had goodwill of $969 million , compared to $929 million at December 31, 2014. There was an addition to the carrying amount of goodwill of approximately $40 million for the Ahmann & Martin Co. acquisition that occurred during the quarter ended March 31, 2015. See Note 2 for additional information on the Ahmann & Martin Co. acquisition. Other Intangible Assets The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, other intangibles (primarily related to customer relationships acquired in connection with the Corporation’s insurance agency acquisitions), and mortgage servicing rights. There was an addition to the gross carrying amount of other intangibles of approximately $12 million for the customer relationships acquired with the Ahmann & Martin Co. acquisition that occurred during the quarter ended March 31, 2015. See Note 2 for additional information on the Ahmann & Martin Co. acquisition. For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows. Nine Months Ended Year Ended December 31, 2014 ($ in Thousands) Core deposit intangibles: Gross carrying amount $ 36,230 $ 36,230 Accumulated amortization (35,759 ) (34,433 ) Net book value $ 471 $ 1,797 Amortization during the period $ 1,326 $ 2,868 Other intangibles: Gross carrying amount $ 31,398 $ 19,283 Accumulated amortization (14,891 ) (13,643 ) Net book value $ 16,507 $ 5,640 Additions during the period $ 12,115 $ — Amortization during the period $ 1,248 $ 879 The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date. The Corporation periodically evaluates its mortgage servicing rights asset for impairment. Impairment is assessed based on fair value at each reporting date using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). As mortgage interest rates fall, prepayment speeds are usually faster and the value of the mortgage servicing rights asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the mortgage servicing rights asset generally increases, requiring less valuation reserve. A valuation allowance is established, through a charge to earnings, to the extent the amortized cost of the mortgage servicing rights exceeds the estimated fair value by stratification. If it is later determined that all or a portion of the temporary impairment no longer exists for a stratification, the valuation is reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the mortgage servicing rights asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the mortgage servicing rights asset and valuation allowance, precluding subsequent recoveries. See Note 13 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 14 which further discusses fair value measurement relative to the mortgage servicing rights asset. A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows. Nine Months Ended September 30, 2015 Year Ended December 31, 2014 ($ in Thousands) Mortgage servicing rights: Mortgage servicing rights at beginning of period $ 61,379 $ 64,193 Additions 9,853 8,253 Amortization (8,902 ) (11,067 ) Mortgage servicing rights at end of period $ 62,330 $ 61,379 Valuation allowance at beginning of period (1,234 ) (913 ) (Additions) recoveries, net 306 (321 ) Valuation allowance at end of period (928 ) (1,234 ) Mortgage servicing rights, net $ 61,402 $ 60,145 Fair value of mortgage servicing rights $ 67,794 $ 66,342 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,906,960 $ 7,999,294 Mortgage servicing rights, net to servicing portfolio 0.78 % 0.75 % Mortgage servicing rights expense (1) $ 8,596 $ 11,388 (1) Includes the amortization of mortgage servicing rights and additions/recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net, in the consolidated statements of income. The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of September 30, 2015 . The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. Estimated amortization expense: Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights ($ in Thousands) Three months ending December 31, 2015 $ 78 $ 442 $ 2,869 Year ending December 31, 2016 281 1,735 10,147 Year ending December 31, 2017 112 1,702 8,341 Year ending December 31, 2018 — 1,672 6,919 Year ending December 31, 2019 — 1,373 5,781 Year ending December 31, 2020 — 1,256 4,842 Beyond 2020 — 8,327 23,431 Total Estimated Amortization Expense $ 471 $ 16,507 $ 62,330

Short and Long-Term Funding

Short and Long-Term Funding	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Short and Long-Term Funding	Short and Long-Term Funding The components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year) were as follows. September 30, 2015 December 31, 2014 ($ in Thousands) Short-Term Funding Federal funds purchased $ 177,940 $ 109,770 Securities sold under agreements to repurchase 524,629 384,221 Federal funds purchased and securities sold under agreements to repurchase $ 702,569 $ 493,991 FHLB advances 260,000 500,000 Commercial paper 59,766 74,297 Other short-term funding 319,766 574,297 Total short-term funding $ 1,022,335 $ 1,068,288 Long-Term Funding FHLB advances $ 1,750,234 $ 3,000,260 Senior notes, at par 680,000 680,000 Subordinated notes, at par 250,000 250,000 Other long-term funding and capitalized costs (692 ) (143 ) Total long-term funding 2,679,542 3,930,117 Total short and long-term funding $ 3,701,877 $ 4,998,405 Securities sold under agreements to repurchase ("repurchase agreements") The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). See Note 12 for additional disclosures on balance sheet offsetting. The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of September 30, 2015, the Corporation pledged GSE mortgage-related securities with a fair value of $648 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of September 30, 2015 is presented in the following table. Remaining Contractual Maturity of the Agreements September 30, 2015 Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total ($ in Thousands) Repurchase agreements GSE securities $ 524,629 $ — $ — $ — $ 524,629 Total $ 524,629 $ — $ — $ — $ 524,629 Gross amounts of recognized liabilities for repurchase agreements $ 524,629 Long-term funding: FHLB Advances: Long-term FHLB advances had a weighted-average interest rate of 0.13% at September 30, 2015 and 0.11% at December 31, 2014 . The FHLB advances are indexed to the FHLB discount note and reprice at varying intervals. The advances offer flexible, low cost, long-term funding that improves the Corporation’s liquidity profile. 2011 Senior Notes: In March 2011, the Corporation issued $300 million of senior notes due March 2016, and callable February 2016, with a 5.125% fixed coupon at a discount. In September 2011, the Corporation “re-opened” the offering and issued an additional $130 million of the same notes at a premium. 2014 Senior Notes: In November 2014, the Corporation issued $ 250 million of senior notes, due November 2019, and callable October 2019. The senior notes have a fixed coupon interest rate of 2.75% and were issued at a discount. 2014 Subordinated Notes: In November 2014, the Corporation issued $250 million of 10 -year subordinated notes, due January 2025, and callable October 2024. The subordinated notes have a fixed coupon interest rate of 4.25% and were issued at a discount.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Corporation recognized income tax expense of $66 million for the nine months ended September 30, 2015 , compared to income tax expense of $67 million for the comparable period in 2014 . The effective tax rate was 31.14% for the first nine months of 2015 , compared to an effective tax rate of 32.02% for the first nine months of 2014 .

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities The Corporation facilitates customer borrowing activity by providing various interest rate risk management solutions through its capital markets area. To date, all of the notional amounts of customer transactions have been matched with a mirror swap with another counterparty. The Corporation has used, and may again use in the future, derivative instruments to hedge the variability in interest payments or protect the value of certain assets and liabilities recorded on its consolidated balance sheets from changes in interest rates. The predominant derivative and hedging activities include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, written options, purchased options, and certain mortgage banking activities. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. The Corporation is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. To mitigate the counterparty risk, interest rate-related instruments generally contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain mutually agreed upon threshold limits. The Corporation was required to pledge $10 million of investment securities as collateral at September 30, 2015 , and pledged $11 million of investment securities as collateral at December 31, 2014 . Under the Dodd-Frank Wall Street Reform and Consumer Protection Act, as of June 10, 2013, the Corporation must clear all LIBOR interest rate swaps through a clearing house if it can be cleared. As such, the Corporation is required to pledge cash collateral for the margin. At September 30, 2015 , the Corporation posted cash collateral for the margin of $33 million , compared to $15 million at December 31, 2014 . The Corporation’s derivative and hedging instruments are recorded at fair value on the consolidated balance sheets. The fair value of the Corporation’s interest rate-related instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 14 for additional fair value information and disclosures. The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments not designated as hedging instruments. Weighted Average ($ in Thousands) Notional Amount Fair Value Balance Sheet Category Receive Rate (1) Pay Rate (1) Maturity September 30, 2015 Interest rate-related instruments — customer and mirror $ 1,706,721 $ 42,593 Trading assets 1.42% 1.42% 41 months Interest rate-related instruments — customer and mirror 1,706,721 (44,857 ) Trading liabilities 1.42% 1.42% 41 months Interest rate lock commitments (mortgage) 173,622 2,584 Other assets -- -- --- Forward commitments (mortgage) 245,138 (1,982 ) Other liabilities -- -- --- Foreign currency exchange forwards 54,421 1,159 Trading assets -- -- --- Foreign currency exchange forwards 46,201 (960 ) Trading liabilities -- -- --- Purchased options (time deposit) 105,345 2,915 Other assets -- -- --- Written options (time deposit) 105,345 (2,915 ) Other liabilities -- -- --- December 31, 2014 Interest rate-related instruments — customer and mirror $ 1,636,480 $ 33,023 Trading assets 1.60% 1.60% 42 months Interest rate-related instruments — customer and mirror 1,636,480 (35,372 ) Trading liabilities 1.60% 1.60% 42 months Interest rate lock commitments (mortgage) 126,379 1,947 Other assets -- -- --- Forward commitments (mortgage) 234,500 (2,435 ) Other liabilities -- -- --- Foreign currency exchange forwards 60,742 2,140 Trading assets -- -- --- Foreign currency exchange forwards 56,573 (1,957 ) Trading liabilities -- -- --- Purchased options (time deposit) 110,347 6,054 Other assets -- -- --- Written options (time deposit) 110,347 (6,054 ) Other liabilities -- -- --- (1) Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only. The table below identifies the income statement category of the gains and losses recognized in income on the Corporation’s derivative instruments not designated as hedging instruments. Income Statement Category of Gain /(Loss) Recognized in Income Gain /(Loss) Recognized in Income ($ in Thousands) Nine Months Ended September 30, 2015 Interest rate-related instruments — customer and mirror, net Capital market fees, net $ 85 Interest rate lock commitments (mortgage) Mortgage banking, net 637 Forward commitments (mortgage) Mortgage banking, net 453 Foreign currency exchange forwards Capital market fees, net 16 Nine Months Ended September 30, 2014 Interest rate-related instruments — customer and mirror, net Capital market fees, net $ 626 Interest rate lock commitments (mortgage) Mortgage banking, net 1,024 Forward commitments (mortgage) Mortgage banking, net (1,924 ) Foreign currency exchange forwards Capital market fees, net 118 Free standing derivatives The Corporation enters into various derivative contracts which are designated as free standing derivative contracts. These derivative contracts are not designated against specific assets and liabilities on the balance sheet or forecasted transactions and, therefore, do not qualify for hedge accounting treatment. Such derivative contracts are carried at fair value on the consolidated balance sheets with changes in the fair value recorded as a component of Capital market fees, net, and typically include interest rate-related instruments (swaps and caps). Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk. The Corporation’s market risk from unfavorable movements in interest rates related to these derivative contracts is generally economically hedged by concurrently entering into offsetting derivative contracts. The offsetting derivative contracts have identical notional values, terms and indices. See Note 12 for additional information and disclosures on balance sheet offsetting. Mortgage derivatives Interest rate lock 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 with the changes in fair value recorded as a component of mortgage banking, net. Foreign currency exchange derivatives The Corporation provides foreign currency exchange services to customers, primarily forward contracts. Our customers enter into a foreign currency exchange forward with the Corporation as a means for them to mitigate exchange rate risk. The Corporation mitigates its risk by then entering into an offsetting foreign currency exchange derivative contract. Such foreign currency exchange contracts are carried at fair value on the consolidated balance sheets with changes in fair value recorded as a component of Capital market fees, net. Written and purchased option derivatives (time deposit) Historically, the Corporation had entered into written and purchased option derivative instruments to facilitate an equity linked time deposit product (the “Power CD”), which the Corporation ceased offering in September 2013. The Power CD was a time deposit that provided the purchaser a guaranteed return of principal at maturity plus a potential equity return (a written option), while the Corporation received a known stream of funds based on the equity return (a purchased option). The written and purchased options are mirror derivative instruments which are carried at fair value on the consolidated balance sheets.

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2015
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate-Related Instruments (“Interest Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation mitigates this risk by entering into equal and offsetting interest rate-related instruments with highly rated third party financial institutions. The interest agreements are free-standing derivatives and are recorded at fair value in the Corporation’s consolidated balance sheets. The Corporation is party to master netting arrangements with its financial institution counterparties; however, the Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The master netting arrangements provide for a single net settlement of all interest agreements, as well as collateral, in the event of default on, or termination of, any one contract. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. See Note 11 for additional information on the Corporation’s derivative and hedging activities. Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”) The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The right of set-off for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). In addition, the Corporation does not enter into reverse repurchase agreements; therefore, there is no such offsetting to be done with the repurchase agreements. See Note 9 for additional disclosures on repurchase agreements. The following table presents the assets and liabilities subject to an enforceable master netting arrangement as of September 30, 2015 and December 31, 2014 . The interest agreements we have with our commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table. Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Gross amounts not offset in the balance sheet Financial instruments Collateral Net amount September 30, 2015 ($ in Thousands) Derivative assets: Interest rate-related instruments $ 48 $ — $ 48 $ (48 ) $ — $ — Derivative liabilities: Interest rate-related instruments $ 44,210 $ — $ 44,210 $ (48 ) $ (42,658 ) $ 1,504 December 31, 2014 Derivative assets: Interest rate-related instruments $ 558 $ — $ 558 $ (558 ) $ — $ — Derivative liabilities: Interest rate-related instruments $ 34,087 $ — $ 34,087 $ (558 ) $ (26,105 ) $ 7,424

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related and other commitments (see below) and derivative instruments (see Note 11). The following is a summary of lending-related commitments. September 30, 2015 December 31, 2014 ($ in Thousands) Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2) $ 6,935,786 $ 6,884,411 Commercial letters of credit (1) 11,484 9,179 Standby letters of credit (3) 317,079 353,292 (1) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at September 30, 2015 or December 31, 2014 . (2) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 11. (3) The Corporation has established a liability of $3 million at September 30, 2015 compared to $4 million at December 31, 2014 , as an estimate of the fair value of these financial instruments. Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The allowance for unfunded commitments totaled $24 million at September 30, 2015 down from $25 million at December 31, 2014 , and is included in accrued expenses and other liabilities on the consolidated balance sheets. See Note 7 for additional information on the allowance for unfunded commitments. Lending-related commitments include commitments to extend credit, commitments to originate residential mortgage loans held for sale, commercial letters of credit, and standby letters of credit. Commitments to extend credit are legally binding agreements to lend to customers at predetermined interest rates, as long as there is no violation of any condition established in the contracts. Interest rate lock 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. The Corporation’s derivative and hedging activity is further described in Note 11. Commercial and standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party, while standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party. Other Commitments The Corporation has principal investment commitments to provide capital-based financing to private and public companies through either direct investments in specific companies or through investment funds and partnerships. The timing of future cash requirements to fund such commitments is generally dependent on the investment cycle, whereby privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, which can vary based on overall market conditions, as well as the nature and type of industry in which the companies operate. The Corporation also invests in low-income housing, small-business commercial real estate, new market tax credit projects, and historic tax credit projects to promote the revitalization of low-to-moderate-income neighborhoods throughout the local communities of its bank subsidiary. As a limited partner in these unconsolidated projects, the Corporation is allocated tax credits and deductions associated with the underlying projects. The aggregate carrying value of these investments at September 30, 2015 was $41 million , compared to $27 million at December 31, 2014 , included in other assets on the consolidated balance sheets. Related to these investments, the Corporation had remaining commitments to fund of $33 million at September 30, 2015 and $28 million at December 31, 2014 . Contingent Liabilities The Corporation is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which involve claims for substantial amounts. Although there can be no assurance as to the ultimate outcomes, the Corporation believes it has meritorious defenses to the claims asserted against it in its current outstanding matters, including the matters described below, and with respect to such legal proceedings, intends to continue to defend itself vigorously. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of both the Corporation and its shareholders. On at least a quarterly basis, the Corporation assesses its liabilities and contingencies in connection with all pending or threatened claims and litigation, utilizing the most recent information available. On a matter by matter basis, an accrual for loss is established for those matters which the Corporation believes it is probable that a loss may be incurred and that the amount of such loss can be reasonably estimated. Once established, each accrual is adjusted as appropriate to reflect any subsequent developments. Accordingly, management’s estimate will change from time to time, and actual losses may be more or less than the current estimate. For matters where a loss is not probable, or the amount of the loss cannot be estimated, no accrual is established. Resolution of legal claims is inherently unpredictable, and in many legal proceedings various factors exacerbate this inherent unpredictability, including where the damages sought are unsubstantiated or indeterminate, it is unclear whether a case brought as a class action will be allowed to proceed on that basis, discovery is not complete, the proceeding is not yet in its final stages, the matters present legal uncertainties, there are significant facts in dispute, there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants), or there is a wide range of potential results. A lawsuit, R.J. ZAYED v. Associated Bank, N.A. , was filed in the United States District Court for the District of Minnesota on January 29, 2013. The lawsuit relates to a Ponzi scheme perpetrated by Oxford Global Partners and related entities (“Oxford”) and individuals and was brought by the receiver for Oxford. Oxford was a depository customer of Associated Bank, N.A. (the "Bank"). The lawsuit claims that the Bank is liable for failing to uncover the Oxford Ponzi scheme, and specifically alleges the Bank aided and abetted (1) the fraudulent scheme; (2) a breach of fiduciary duty; (3) conversion; and (4) false representations and omissions. The lawsuit seeks unspecified consequential and punitive damages. The District Court granted the Bank’s motion to dismiss the complaint on September 30, 2013. On March 2, 2015, the U.S. Court of Appeals for the Eighth Circuit reversed the District Court and remanded the case back to the District Court for further proceedings. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time. A lawsuit by investors in the same Ponzi scheme, Herman Grad, et al v. Associated Bank, N.A. , brought in Brown County, Wisconsin in October 2009 was dismissed by the circuit court, and the dismissal was affirmed by the Wisconsin Court of Appeals in June 2011 in an unpublished opinion. On May 22, 2015, the Bank entered into a Conciliation Agreement ("Conciliation Agreement") with the U.S. Department of Housing and Urban Development ("HUD") which resolved the previously disclosed HUD investigation into the Bank's lending practices during the years 2008-2010. The Bank's commitments under the Conciliation Agreement are spread over a three -year period and include commitments to do the following in minority communities: make mortgage loans of approximately $196 million ; open one branch and four loan production offices; establish special financing programs; make affordable home repair grants; engage in affirmative marketing outreach; provide financial education programs; and make grants to support community reinvestment training and education. The cost of these commitments will be spread over four calendar years and is not expected to have a material impact on the Corporation's financial condition or results of operation. Beginning in late 2013, the Corporation began reviewing a variety of legacy products provided by third parties, including debt protection and identity protection products. In connection with this review, the Corporation has made, and plans to make, remediation payments to affected customers and former customers, and has reserved accordingly. A variety of consumer products, including the legacy debt protection and identity protection products referred to above, and mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters. Mortgage Repurchase Reserve The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under our usual underwriting procedures, and are most often sold on a nonrecourse basis, primarily to the GSEs. The Corporation’s agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold, related to credit information, loan documentation, collateral, and insurability. Subsequent to being sold, if a material underwriting deficiency or documentation defect is discovered, the Corporation may be obligated to repurchase the loan or reimburse the GSEs for losses incurred (collectively, “make whole requests”). The make whole requests and any related risk of loss under the representations and warranties are largely driven by borrower performance. As a result of make whole requests, the Corporation has repurchased loans with principal balances of approximately $3 million and $5 million during the nine months ended September 30, 2015 and the year ended December 31, 2014 , respectively, and paid loss reimbursement or settlement claims of approximately $117,000 and $734,000 during the nine months ended September 30, 2015 and the year ended December 31, 2014 , respectively. Make whole requests during 2014 and the first nine months of 2015 generally arose from loans sold during the period January 1, 2006 to September 30, 2015 , which totaled $19.6 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of September 30, 2015 , approximately $7.5 billion of these sold loans remain outstanding. The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The following summarizes the changes in the mortgage repurchase reserve. For The Nine Months Ended September 30, 2015 For The Year Ended December 31, 2014 ($ in Thousands) Balance at beginning of period $ 3,258 $ 5,737 Repurchase provision expense 340 505 Adjustments to provision expense (2,450 ) (2,250 ) Charge offs (23 ) (734 ) Balance at end of period $ 1,125 $ 3,258 The Corporation may also sell residential mortgage loans with limited recourse (limited in that the recourse period ends prior to the loan’s maturity, usually after certain time and / or loan paydown criteria have been met), whereby repurchase could be required if the loan had defined delinquency issues during the limited recourse periods. At September 30, 2015 and December 31, 2014 , there were approximately $69 million and $46 million , respectively, of residential mortgage loans sold with such recourse risk. There have been limited instances and immaterial historical losses on repurchases for recourse under the limited recourse criteria. The Corporation has a subordinate position to the FHLB in the credit risk on residential mortgage loans it sold to the FHLB in exchange for a monthly credit enhancement fee. The Corporation has not sold loans to the FHLB with such credit risk retention since February 2005. At September 30, 2015 and December 31, 2014 , there were $142 million and $178 million , respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value represents the estimated price at which an orderly transaction to sell an asset or to transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept). Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a recurring basis at fair value, including the general classification of such instruments pursuant to the valuation hierarchy. Investment securities available for sale Where quoted prices are available in an active market, investment securities are classified in Level 1 of the fair value hierarchy. Level 1 investment securities primarily include U.S. Treasury and exchange-traded debt and equity securities. If quoted market prices are not available for the specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. Examples of these investment securities include obligations of state and political subdivisions ("municipal securities"), mortgage-related securities and other debt securities. Lastly, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, securities are classified within Level 3 of the fair value hierarchy. To validate the fair value estimates, assumptions, and controls, the Corporation looks to transactions for similar instruments and utilizes independent pricing provided by third party vendors or brokers and relevant market indices. While none of these sources are solely indicative of fair value, they serve as directional indicators for the appropriateness of the Corporation’s fair value estimates. The Corporation has determined that the fair value measures of its investment securities are classified predominantly within Level 1 or 2 of the fair value hierarchy. See Note 6 for additional disclosure regarding the Corporation’s investment securities. Derivative financial instruments (interest rate-related instruments ) The Corporation has used, and may again use in the future, interest rate swaps to manage its interest rate risk. In addition, the Corporation offers customer interest rate-related instruments (swaps and caps) to service our customers’ needs, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror interest rate-related instruments) with third parties to manage its interest rate risk associated with these financial instruments. The valuation of the Corporation’s derivative financial instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and, also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 11 for additional disclosure regarding the Corporation’s derivative financial instruments. The discounted cash flow analysis component in the fair value measurement reflects the contractual terms of the derivative financial instruments, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. More specifically, the fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments), with the variable cash payments (or receipts) based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. Likewise, the fair values of interest rate options (i.e., interest rate caps) are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (or rise above) the strike rate of the floors (or caps), with the variable interest rates used in the calculation of projected receipts on the floor (or cap) based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. In conjunction with the FASB’s fair value measurement guidance, the Corporation made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. While the Corporation has determined that the majority of the inputs used to value its derivative financial instruments fall within Level 2 of the fair value hierarchy, the credit valuation adjustments utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions as of September 30, 2015 , and December 31, 2014 , and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments in their entirety are classified within Level 2 of the fair value hierarchy. Derivative financial instruments (foreign currency exchange forwards ) The Corporation provides foreign currency exchange services to customers. In addition, the Corporation may enter into a foreign currency exchange forward to mitigate the exchange rate risk attached to the cash flows of a loan or as an offsetting contract to a forward entered into as a service to our customer. The valuation of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. See Note 11 for additional disclosures regarding the Corporation’s foreign currency exchange forwards. Derivative financial instruments (mortgage derivatives) Mortgage derivatives include interest rate lock commitments to originate residential mortgage loans held for sale to individual customers and forward commitments to sell residential mortgage loans to various investors. The Corporation relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups. The Corporation also relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. While there are Level 2 and 3 inputs used in the valuation models, the Corporation has determined that the majority of the inputs significant in the valuation of both of the mortgage derivatives fall within Level 3 of the fair value hierarchy. See Note 11 for additional disclosure regarding the Corporation’s mortgage derivatives. Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a nonrecurring basis at the lower of amortized cost or estimated fair value, including the general classification of such instruments pursuant to the valuation hierarchy. Loans Held for Sale Loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are carried at the lower of cost or estimated fair value. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics, which the Corporation classifies as a Level 2 nonrecurring fair value measurement. Impaired Loans The Corporation considers a loan impaired when it is probable that the Corporation will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that commercial and consumer loan relationships that have nonaccrual status or have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note. See Note 7 for additional information regarding the Corporation’s impaired loans. Mortgage servicing rights Mortgage servicing rights do not trade in an active, open market with readily observable prices. While sales of mortgage servicing rights do occur, the precise terms and conditions typically are not readily available to allow for a “quoted price for similar assets” comparison. Accordingly, the Corporation utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its mortgage servicing rights. The valuation model incorporates prepayment assumptions to project mortgage servicing rights cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the mortgage servicing rights. The valuation model considers portfolio characteristics of the underlying mortgages, contractually specified servicing fees, prepayment assumptions, discount rate assumptions, delinquency rates, late charges, other ancillary revenue, costs to service, and other economic factors. The Corporation periodically reviews and assesses the underlying inputs and assumptions used in the model. In addition, the Corporation compares its fair value estimates and assumptions to observable market data for mortgage servicing rights, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, mortgage servicing rights are classified within Level 3 of the fair value hierarchy. The Corporation uses the amortization method (i.e., lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, for its mortgage servicing rights assets. See Note 8 for additional disclosure regarding the Corporation’s mortgage servicing rights. The table below presents the Corporation’s investment securities available for sale and derivative financial instruments measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 , aggregated by the level in the fair value hierarchy within which those measurements fall. Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Measurements Using September 30, 2015 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Investment securities available for sale: U.S. Treasury securities $ 1,002 $ 1,002 $ — $ — Municipal securities 427,701 — 427,701 — Residential mortgage-related securities: Government-sponsored enterprise (GSE) 3,088,923 — 3,088,923 — Private-label 1,746 — 1,746 — GSE commercial mortgage-related securities 1,877,581 — 1,877,581 — Other securities (debt and equity) 6,703 3,503 3,000 200 Total investment securities available for sale $ 5,403,656 $ 4,505 $ 5,398,951 $ 200 Derivatives (trading and other assets) $ 49,251 $ — $ 46,667 $ 2,584 Liabilities: Derivatives (trading and other liabilities) $ 50,714 $ — $ 48,732 $ 1,982 Fair Value Measurements Using December 31, 2014 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Investment securities available for sale: U.S. Treasury securities $ 998 $ 998 $ — $ — Municipal securities 582,679 — 582,679 — Residential mortgage-related securities: GSE 3,730,789 — 3,730,789 — Private-label 2,294 — 2,294 — GSE commercial mortgage-related securities 1,073,893 — 1,073,893 — Other securities (debt and equity) 6,159 2,959 3,000 200 Total investment securities available for sale $ 5,396,812 $ 3,957 $ 5,392,655 $ 200 Derivatives (trading and other assets) $ 43,164 $ — $ 41,217 $ 1,947 Liabilities: Derivatives (trading and other liabilities) $ 45,818 $ — $ 43,383 $ 2,435 The table below presents a rollforward of the balance sheet amounts for the year ended December 31, 2014 and the nine months ended September 30, 2015 , for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy. Investment Securities Available for Sale Derivative Financial Instruments ($ in Thousands) Balance December 31, 2013 $ 299 $ 1,717 Total net losses included in income: Mortgage derivative loss — (2,205 ) Sales of investment securities (99 ) — Balance December 31, 2014 $ 200 $ (488 ) Total net gains included in income: Mortgage derivative gain — 1,090 Balance September 30, 2015 $ 200 $ 602 For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of September 30, 2015 , the Corporation utilized the following valuation techniques and significant unobservable inputs. Derivative financial instruments (mortgage derivative – interest rate lock commitments to originate residential mortgage loans held for sale) The significant unobservable input used in the fair value measurement of the Corporation’s mortgage derivative interest rate lock commitments (“IRLC”) is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data, particularly the change in the current interest rates from the time of initial rate lock. The closing ratio is periodically reviewed for reasonableness and reported to the Mortgage Risk Management Committee. At September 30, 2015 , the closing ratio was 87% . Impaired loans For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note, resulting in average discounts of 10% to 20% . Mortgage servicing rights The discounted cash flow analyses that generate expected market prices utilize the observable characteristics of the mortgage servicing rights portfolio, as well as certain unobservable valuation parameters. The significant unobservable inputs used in the fair value measurement of the Corporation’s mortgage servicing rights are the weighted average constant prepayment rate and weighted average discount rate, which were 13.4% and 9.6% at September 30, 2015 , respectively. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement. These parameter assumptions fall within a range that the Corporation, in consultation with an independent third party, believes purchasers of servicing would apply to such portfolios sold into the current secondary servicing market. Discussions are held with members from management to reconcile the fair value estimates and the key assumptions used by the respective parties in arriving at those estimates. The Mortgage Risk Management Committee is responsible for providing control over the valuation methodology and key assumptions. To assess the reasonableness of the fair value measurement, the Corporation also compares the fair value and constant prepayment rate to a value calculated by an independent third party on an annual basis. The table below presents the balances of the Corporation’s loans held for sale, impaired loans, and mortgage servicing rights measured at fair value on a nonrecurring basis as of September 30, 2015 and December 31, 2014 , aggregated by the level in the fair value hierarchy within which those measurements fall. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Fair Value Measurements Using September 30, 2015 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Loans held for sale $ 106,276 $ — $ 106,276 $ — Impaired loans (1) 72,661 — — 72,661 Mortgage servicing rights 67,794 — — 67,794 Fair Value Measurements Using December 31, 2014 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Loans held for sale $ 156,423 $ — $ 156,423 $ — Impaired loans (1) 83,956 — — 83,956 Mortgage servicing rights 66,342 — — 66,342 (1) Represents individually evaluated impaired loans, net of the related allowance for loan losses. Certain nonfinancial assets measured at fair value on a nonrecurring basis include other real estate owned (upon initial recognition or subsequent impairment), nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment test, and intangible assets and other nonfinancial long-lived assets measured at fair value for impairment assessment. During the first nine months of 2015 and the full year 2014 , certain other real estate owned, upon initial recognition, was re-measured and reported at fair value through a charge off to the allowance for loan losses based upon the estimated fair value of the other real estate owned, less estimated selling costs. The fair value of other real estate owned, upon initial recognition or subsequent impairment, was estimated using appraised values, which the Corporation classifies as a Level 2 nonrecurring fair value measurement. Other real estate owned measured at fair value upon initial recognition totaled approximately $6 million for the first nine months of 2015 and $21 million for the year ended December 31, 2014 . In addition to other real estate owned measured at fair value upon initial recognition, the Corporation also recorded write-downs to the balance of other real estate owned for subsequent impairment of less than $1 million and $2 million to asset losses, net for the nine months ended September 30, 2015 and the year ended December 31, 2014 , respectively. Fair Value of Financial Instruments: Fair value estimates, methods, and assumptions are set forth below for the Corporation’s financial instruments. September 30, 2015 Carrying Amount Fair Value Fair Value Measurements Using Level 1 Level 2 Level 3 ($ in Thousands) Financial assets: Cash and due from banks $ 303,701 $ 303,701 $ 303,701 $ — $ — Interest-bearing deposits in other financial institutions 70,023 70,023 70,023 — — Federal funds sold and securities purchased under agreements to resell 36,490 36,490 36,490 — — Investment securities held to maturity 604,799 613,372 — 613,372 — Investment securities available for sale 5,403,656 5,403,656 4,505 5,398,951 200 FHLB and Federal Reserve Bank stocks 160,871 160,871 — 160,871 — Loans held for sale 105,144 106,276 — 106,276 — Loans, net 18,262,237 18,435,809 — — 18,435,809 Bank owned life insurance 580,289 580,289 — 580,289 — Accrued interest receivable 70,977 70,977 70,977 — — Interest rate-related instruments 42,593 42,593 — 42,593 — Foreign currency exchange forwards 1,159 1,159 — 1,159 — Interest rate lock commitments to originate residential mortgage loans held for sale 2,584 2,584 — — 2,584 Purchased options (time deposit) 2,915 2,915 — 2,915 — Financial liabilities: Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits $ 18,936,600 $ 18,936,600 $ — $ — $ 18,936,600 Brokered CDs and other time deposits 1,621,795 1,632,811 — 1,632,811 — Short-term funding 1,022,335 1,022,335 — 1,022,335 — Long-term funding 2,679,542 2,740,335 — 2,740,335 — Accrued interest payable 6,888 6,888 6,888 — — Interest rate-related instruments 44,857 44,857 — 44,857 — Foreign currency exchange forwards 960 960 — 960 — Forward commitments to sell residential mortgage loans 1,982 1,982 — — 1,982 Standby letters of credit (1) 3,164 3,164 — 3,164 — Written options (time deposit) 2,915 2,915 — 2,915 — December 31, 2014 Carrying Amount Fair Value Fair Value Measurements Using Level 1 Level 2 Level 3 ($ in Thousands) Financial assets: Cash and due from banks $ 444,113 $ 444,113 $ 444,113 $ — $ — Interest-bearing deposits in other financial institutions 571,924 571,924 571,924 — — Federal funds sold and securities purchased under agreements to resell 16,030 16,030 16,030 — — Investment securities held to maturity 404,455 413,067 — 413,067 — Investment securities available for sale 5,396,812 5,396,812 3,957 5,392,655 200 FHLB and Federal Reserve Bank stocks 189,107 189,107 — 189,107 — Loans held for sale 154,935 156,423 — 156,423 — Loans, net 17,327,544 17,427,647 — — 17,427,647 Bank owned life insurance 574,154 574,154 — 574,154 — Accrued interest receivable 67,573 67,573 67,573 — — Interest rate-related instruments 33,023 33,023 — 33,023 — Foreign currency exchange forwards 2,140 2,140 — 2,140 — Interest rate lock commitments to originate residential mortgage loans held for sale 1,947 1,947 — — 1,947 Purchased options (time deposit) 6,054 6,054 — 6,054 — Financial liabilities: Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits $ 17,192,049 $ 17,192,049 $ — $ — $ 17,192,049 Brokered CDs and other time deposits 1,571,455 1,571,455 — 1,571,455 — Short-term funding 1,068,288 1,068,288 — 1,068,288 — Long-term funding 3,930,117 3,975,605 — 3,975,605 — Accrued interest payable 9,530 9,530 9,530 — — Interest rate-related instruments 35,372 35,372 — 35,372 — Foreign currency exchange forwards 1,957 1,957 — 1,957 — Standby letters of credit (1) 3,542 3,542 — 3,542 — Forward commitments to sell residential mortgage loans 2,435 2,435 — — 2,435 Written options (time deposit) 6,054 6,054 — 6,054 — (1) The commitment on standby letters of credit was $317 million and $353 million at September 30, 2015 and December 31, 2014 , respectively. See Note 13 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. Cash and due from banks, interest-bearing deposits in other financial institutions, federal funds sold and securities purchased under agreements to resell, and accrued interest receivable – For these short-term instruments, the carrying amount is a reasonable estimate of fair value. Investment securities (held to maturity and available for sale) – The fair value of investment securities is based on quoted prices in active markets, or if quoted prices are not available for a specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows. FHLB and Federal Reserve Bank stocks – The carrying amount is a reasonable fair value estimate for the Federal Reserve Bank and Federal Home Loan Bank stocks given their “restricted” nature (i.e., the stock can only be sold back to the respective institutions (Federal Home Loan Bank or Federal Reserve Bank) or another member institution at par). Loans held for sale – The fair value estimation process for the loans held for sale portfolio is segregated by loan type and is based on what secondary markets are currently offering for portfolios with similar characteristics. Loans, net – The fair value estimation process for the loan portfolio uses an exit price concept and reflects discounts the Corporation believes are consistent with liquidity discounts in the market place. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial and industrial, real estate construction, commercial real estate (owner occupied and investor), lease financing, residential mortgage, home equity, other installment, and credit cards. The fair value of loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for similar maturities. The fair value analysis also included other assumptions to estimate fair value, intended to approximate those a market participant would use in an orderly transaction, with adjustments for discount rates, interest rates, liquidity, and credit spreads, as appropriate. Bank owned life insurance – The fair value of bank owned life insurance approximates the carrying amount, because upon liquidation of these investments, the Corporation would receive the cash surrender value which equals the carrying amount. Deposits – The fair value of deposits with no stated maturity such as noninterest-bearing demand deposits, savings, interest-bearing demand deposits, and money market deposits, is equal to the amount payable on demand as of the balance sheet date. The fair value of Brokered CDs and other time deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. However, if the estimated fair value of Brokered CDs and other time deposits is less than the carrying value, the carrying value is reported as the fair value. Accrued interest payable and short-term funding – For these short-term instruments, the carrying amount is a reasonable estimate of fair value. Long-term funding – Rates currently available to the Corporation for debt with similar terms and remaining maturities are used to estimate the fair value of existing long-term funding. Interest rate-related instruments – The fair value of interest rate-related instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Foreign currency exchange forwards – The fair value of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate. Standby letters of credit – The fair value of standby letters of credit represent deferred fees arising from the related off-balance sheet financial instruments. These deferred fees approximate the fair value of these instruments and are based on several factors, including the remaining terms of the agreement and the credit standing of the customer. Interest rate lock commitments to originate residential mortgage loans held for sale – The Corporation relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups. Forward commitments to sell residential mortgage loans – The Corporation relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. Purchased and written options – The fair value of the Corporation’s purchased and written options is determined using quoted prices of the underlying stocks. Limitations – Fair value estimates are made at a specific point in time, based on relevant market information and other information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Corporation’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Corporation’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit retirement plan (the Retirement Account Plan (“RAP”)) covering substantially all full-time employees. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes. In connection with the First Federal acquisition in October 2004, the Corporation assumed the First Federal pension plan (the “First Federal Plan”). The First Federal Plan was frozen on December 31, 2004 and qualified participants in the First Federal Plan became eligible to participate in the RAP as of January 1, 2005. Additional discussion and information on the RAP and the First Federal Plan are collectively referred to below as the “Pension Plan”. The Corporation also provides healthcare access for eligible retired employees in its Postretirement Plan (the “Postretirement Plan”). Retirees who are at least 55 years of age with 5 years of service are eligible to participate in the Postretirement Plan. The Corporation has no plan assets attributable to the Postretirement Plan. The Corporation reserves the right to terminate or make changes to the Postretirement Plan at any time. The components of net periodic benefit cost for the Pension and Postretirement Plans for the three and nine months ended September 30, 2015 and 2014 , respectively, and for the full year 2014 were as follows. Three Months Ended September 30, Nine Months Ended September 30, Year Ended December 31, 2015 2014 2015 2014 2014 ($ in Thousands) Components of Net Periodic Benefit Cost Pension Plan: Service cost $ 2,318 $ 2,975 $ 8,443 8,925 $ 11,058 Interest cost 1,678 1,790 4,963 5,370 7,132 Expected return on plan assets (5,379 ) (4,855 ) (16,079 ) (14,565 ) (19,922 ) Amortization of prior service cost 12 15 37 45 58 Amortization of actuarial loss 627 326 1,692 975 1,384 Total net periodic benefit cost $ (744 ) $ 251 $ (944 ) $ 750 $ (290 ) Postretirement Plan: Interest cost $ 35 $ 39 $ 105 116 $ 150 Amortization of actuarial gain — (9 ) — (26 ) (35 ) Total net periodic benefit cost $ 35 $ 30 $ 105 $ 90 $ 115 The Corporation’s funding policy is to pay at least the minimum amount required by the funding requirements of federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its Pension Plan.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Corporation utilizes a risk-based internal profitability measurement system to provide strategic business unit reporting. The profitability measurement system is based on internal management methodologies designed to produce consistent results and reflect the underlying economics of the units. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer and the distribution of those products and services are similar. The three reportable segments are Corporate and Commercial Specialty; Community, Consumer, and Business; and Risk Management and Shared Services, with no segment representing more than half of the assets of the Corporation as a whole. The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation's 2014 annual report on Form 10-K with certain exceptions, as noted below. The Corporation allocates interest income or interest expense using a funds transfer pricing methodology that charges users of funds (assets) interest expense and credits providers of funds (liabilities, primarily deposits) with income based on the maturity, prepayment and / or repricing characteristics of the assets and liabilities. The net effect of this allocation is recorded in the Risk Management and Shared Services segment. A credit provision is allocated to segments based on the expected long-term annual net charge off rates attributable to the credit risk of loans managed by the segment during the period. In contrast, the level of the consolidated provision for credit losses is determined using the methodologies described in the Corporation's 2014 annual report on Form 10-K to assess the overall appropriateness of the allowance for credit losses. The net effect of the credit provision is recorded in Risk Management and Shared Services. Indirect expenses incurred by certain centralized support areas are allocated to segments based on actual usage (for example, volume measurements) and other criteria. Certain types of administrative expense and bank-wide expense accruals (including amortization of core deposit and other intangible assets associated with acquisitions) are generally not allocated to segments. Income taxes are allocated to segments based on the Corporation’s estimated effective tax rate, with certain segments adjusted for any tax-exempt income or non-deductible expenses. Equity is allocated to the segments based on regulatory capital requirements and in proportion to an assessment of the inherent risks associated with the business of the segment (including interest, credit and operating risk). The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to U.S. generally accepted accounting principles. As a result, reported segments and the financial information of the reported segments are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in previously reported segment financial data. During 2015, certain organizational and methodology changes were made and, accordingly, 2014 results have been restated and presented on a comparable basis. A description of each business segment is presented below. Corporate and Commercial Specialty — The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, non-profits, municipalities, and financial institutions. In serving this segment we compete based on an in-depth understanding of our customers’ financial needs, the ability to match market competitive solutions to those needs, and the highest standards of relationship and service excellence in the delivery of these services. Delivery of services is provided through our corporate and commercial units, our commercial real estate unit, as well as our specialized industries and commercial financial services units. Within this segment we provide the following products and services: (1) lending solutions, such as commercial loans and lines of credit, commercial real estate financing, construction loans, letters of credit, leasing, and asset based lending; for our larger clients we also provide loan syndications; (2) deposit and cash management solutions such as commercial checking and interest-bearing deposit products, cash vault and night depository services, liquidity solutions, payables and receivables solutions; and information services; and (3) specialized financial services such as swaps, capital markets, foreign exchange, and international banking solutions. Community, Consumer, and Business — The Community, Consumer, and Business segment serves individuals, as well as small and mid-size businesses. In serving this segment we compete based on providing a broad range of solutions to meet the needs of our customers in their entire financial lifecycle, convenient access to our services through multiple channels such as branches, phone based services, online and mobile banking, and a relationship based business model which assists our customers in navigating any changes and challenges in their financial circumstances. Delivery of services is provided through our various Consumer Banking, Community Banking, and Private Client units. Within this segment we provide the following products and services: (1) lending solutions such as residential mortgages, home equity loans and lines of credit, personal and installment loans, real estate financing, business loans, and business lines of credit; (2) deposit and transactional solutions such as checking, credit, debit and pre-paid cards, online banking and bill pay, and money transfer services; (3) investable funds solutions such as savings, money market deposit accounts, IRA accounts, certificates of deposit, fixed and variable annuities, full-service, discount and on-line investment brokerage; investment advisory services; trust and investment management accounts; (4) insurance, benefits related products and services; and (5) fiduciary services such as administration of pension, profit-sharing and other employee benefit plans, fiduciary and corporate agency services, and institutional asset management. Risk Management and Shared Services — The Risk Management and Shared Services segment includes Corporate Risk Management, Credit Administration, Finance, Treasury, Operations and Technology, which are key shared functions. The segment also includes Parent Company activity, intersegment eliminations and residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (funds transfer pricing mismatches) and credit risk and provision residuals (long term credit charge mismatches). The earning assets within this segment include the Corporation’s investment portfolio and capital includes both allocated as well as any remaining unallocated capital. Information about the Corporation’s segments is presented below. Segment Income Statement Data ($ in Thousands) Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Nine Months Ended September 30, 2015 Net interest income $ 230,130 $ 261,951 $ 12,729 $ 504,810 Noninterest income 36,222 200,042 10,249 246,513 Total revenue 266,352 461,993 22,978 751,323 Credit provision * 30,312 19,625 (32,437 ) 17,500 Noninterest expense 106,643 366,410 49,454 522,507 Income before income taxes 129,397 75,958 5,961 211,316 Income tax expense (benefit) 44,384 26,585 (5,163 ) 65,806 Net income $ 85,013 $ 49,373 $ 11,124 $ 145,510 Return on average allocated capital (ROCET1) ** 11.8 % 10.3 % 3.9 % 10.3 % Nine Months Ended September 30, 2014 Net interest income $ 220,973 $ 227,409 $ 57,924 $ 506,306 Noninterest income 35,971 168,287 16,418 220,676 Total revenue 256,944 395,696 74,342 726,982 Credit provision * 37,021 16,534 (42,555 ) 11,000 Noninterest expense 110,558 346,084 50,794 507,436 Income before income taxes 109,365 33,078 66,103 208,546 Income tax expense 35,767 11,388 19,620 66,775 Net income $ 73,598 $ 21,690 $ 46,483 $ 141,771 Return on average allocated capital (ROCET1) ** 12.8 % 5.4 % 9.8 % 9.8 % Segment Balance Sheet Data ($ in Thousands) Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Average Balances for YTD 3Q 2015 Average earning assets $ 9,373,312 $ 8,719,078 $ 6,326,258 $ 24,418,648 Average loans 9,363,936 8,719,078 71,378 18,154,392 Average deposits 5,730,918 10,786,342 3,145,612 19,662,872 Average allocated capital (CET1) ** $ 966,746 $ 640,116 $ 213,750 $ 1,820,612 Average Balances for YTD 3Q 2014 Average earning assets $ 8,933,616 $ 7,646,487 $ 5,933,220 $ 22,513,323 Average loans 8,922,631 7,646,487 85,115 16,654,233 Average deposits 5,129,046 9,872,624 2,347,059 17,348,729 Average allocated capital (CET1) ** $ 766,391 $ 535,528 $ 585,493 $ 1,887,412 Segment Income Statement Data Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Three Months Ended September 30, 2015 Net interest income $ 78,283 $ 88,209 $ 4,017 $ 170,509 Noninterest income 11,305 64,911 3,700 79,916 Total revenue 89,588 153,120 7,717 250,425 Credit provision * 10,851 5,963 (8,814 ) 8,000 Noninterest expense 37,293 122,393 11,750 171,436 Income before income taxes 41,444 24,764 4,781 70,989 Income tax expense (benefit) 13,955 8,667 (1,071 ) 21,551 Net income $ 27,489 $ 16,097 $ 5,852 $ 49,438 Return on average allocated capital (ROCET1) ** 11.0 % 10.1 % 6.7 % 10.2 % Three Months Ended September 30, 2014 Net interest income $ 72,474 $ 82,067 $ 18,089 $ 172,630 Noninterest income 11,888 54,601 8,419 74,908 Total revenue 84,362 136,668 26,508 247,538 Credit provision * 11,074 6,773 (16,847 ) 1,000 Noninterest expense 35,044 122,722 14,087 171,853 Income before income taxes 38,244 7,173 29,268 74,685 Income tax expense 12,343 2,467 9,668 24,478 Net income $ 25,901 $ 4,706 $ 19,600 $ 50,207 Return on average allocated capital (ROCET1) ** 13.8 % 3.2 % 13.4 % 10.4 % Segment Balance Sheet Data Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Average Balances for 3Q15 Average earning assets $ 9,475,469 $ 8,917,831 $ 6,440,714 $ 24,834,014 Average loans 9,466,761 8,917,831 68,157 18,452,749 Average deposits 6,044,306 10,969,172 3,280,121 20,293,599 Average allocated capital (CET1) ** $ 988,283 $ 632,878 $ 216,275 $ 1,837,436 Average Balances for 3Q14 Average earning assets $ 8,761,870 $ 8,310,839 $ 6,024,008 $ 23,096,717 Average loans 8,750,207 8,310,839 79,915 17,140,961 Average deposits 5,092,314 10,337,637 2,443,427 17,873,378 Average allocated capital (CET1) ** $ 744,792 $ 583,096 $ 543,358 $ 1,871,246 * The consolidated credit provision is equal to the actual reported provision for credit losses. ** The Federal Reserve establishes capital adequacy requirements for the Corporation, including Tier 1 capital. Tier 1 capital is comprised of common capital and certain redeemable, non-cumulative preferred stock. Average allocated capital represents average common equity Tier 1 which is defined as average Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities. This is a non-GAAP financial measure. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1 ("CET1"). The ROCET1 for the Risk Management and Shared Services segment and the Consolidated Total is inclusive of the annualized effect of the preferred stock dividends.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table summarizes the components of accumulated other comprehensive income (loss) at September 30, 2015 and 2014 , changes during the three and nine month periods then ended, and reclassifications out of accumulated other comprehensive income during the three and nine month periods ended September 30, 2015 and 2014 , respectively. The amounts reclassified from accumulated other comprehensive income for the investment securities available for sale are included in investment securities gains, net on the consolidated statements of income, while the amounts reclassified from accumulated other comprehensive income for the defined benefit pension and postretirement obligations are a component of personnel expense on the consolidated statements of income. ($ in Thousands) Investments Securities Available For Sale Defined Benefit Pension and Postretirement Obligations Accumulated Other Comprehensive Income (Loss) Balance January 1, 2015 $ 18,512 $ (23,362 ) $ (4,850 ) Other comprehensive income before reclassifications 35,101 — 35,101 Amounts reclassified from accumulated other comprehensive income (loss) (4,038 ) 1,729 (2,309 ) Income tax expense (11,907 ) (659 ) (12,566 ) Net other comprehensive income during period 19,156 1,070 20,226 Balance September 30, 2015 $ 37,668 $ (22,292 ) $ 15,376 Balance January 1, 2014 $ (11,396 ) $ (12,848 ) $ (24,244 ) Other comprehensive income before reclassifications 36,061 — 36,061 Amounts reclassified from accumulated other comprehensive income (loss) (469 ) 994 525 Income tax expense (13,684 ) (383 ) (14,067 ) Net other comprehensive income during period 21,908 611 22,519 Balance September 30, 2014 $ 10,512 $ (12,237 ) $ (1,725 ) ($ in Thousands) Investments Securities Available For Sale Defined Benefit Pension and Postretirement Obligations Accumulated Other Comprehensive Income (Loss) Balance July 1, 2015 $ 25,282 $ (22,688 ) $ 2,594 Other comprehensive income before reclassifications 22,907 — 22,907 Amounts reclassified from accumulated other comprehensive income (loss) (2,796 ) 639 (2,157 ) Income tax expense (7,725 ) (243 ) (7,968 ) Net other comprehensive income during period 12,386 396 12,782 Balance September 30, 2015 $ 37,668 $ (22,292 ) $ 15,376 Balance July 1, 2014 $ 22,935 $ (12,441 ) $ 10,494 Other comprehensive loss before reclassifications (20,123 ) — (20,123 ) Amounts reclassified from accumulated other comprehensive income (loss) (57 ) 332 275 Income tax (expense) benefit 7,757 (128 ) 7,629 Net other comprehensive income (loss) during period (12,423 ) 204 (12,219 ) Balance September 30, 2014 $ 10,512 $ (12,237 ) $ (1,725 )

New Accounting Pronouncements26

New Accounting Pronouncements Adopted (Policies)	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements Adopted	In June 2015, the FASB issued a technical corrections and improvements accounting standards update which makes minor amendments to the FASB Accounting Standards Codification. The four general topics covered in the guidance include: (1) amendments related to differences between original guidance and the codification, (2) guidance clarification and reference corrections, (3) simplification, and (4) minor improvements. The amendments that require transition guidance are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendments that require transition guidance are not applicable to the Corporation. All other amendments were effective upon the issuance of this update in June 2015. The Corporation adopted the accounting standard during the second quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In May 2015, the FASB issued an amendment to its current guidance regarding pushdown accounting for newly acquired businesses. The amendment eliminates the SEC guidance on pushdown accounting from the Accounting Standard Codification. The amendments align the FASB’s codification with the related material in the SEC's staff accounting bulletin (SAB) No. 115. SAB 115 rescinds portions of the interpretive guidance included in the SEC's Staff Accounting Bulletins series and brings existing guidance into conformity with ASU 2014-17, Pushdown Accounting, which provides an acquired entity with an option to apply pushdown accounting in its separate financial statements upon occurrence of an event in which an acquirer obtains control of the acquired entity. The Corporation adopted the accounting standard during the second quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In August 2014, the FASB issued an amendment to clarify how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. This amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure and (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 the 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. This amendment was effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2014. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In June 2014, the FASB issued an amendment to clarify the current accounting and disclosures for certain repurchase agreements. The amendments in this update require two accounting changes: (1) change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and (2) require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this update also require additional disclosures for certain transactions on the transfer of financial assets, as well as new disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. This amendment was effective for public business entities for the first interim or annual period beginning after December 15, 2014. The Corporation adopted the accounting standard during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. See Note 9 for the new repurchase agreement disclosures. In January 2014, the FASB issued an amendment to clarify that 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, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. This amendment was effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation adopted the accounting standard using the prospective transition method during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity. In January 2014, the FASB issued an amendment which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). For those investments in qualified affordable housing projects not accounted for using the proportional method, the investment should be accounted for as an equity method investment or a cost method investment. The decision to apply the proportional amortization method of accounting is an accounting policy decision that should be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. This amendment should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. This amendment was effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation made an accounting policy election to use the proportional amortization method for investments in qualified affordable housing projects during the first quarter of 2015, which had no material impact on its results of operations, financial position, or liquidity.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Calculations for basic and diluted earnings per common share	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 (In Thousands, except per share data) Net income $ 49,438 $ 50,207 $ 145,510 $ 141,771 Preferred stock dividends (2,184 ) (1,255 ) (4,957 ) (3,777 ) Net income available to common equity $ 47,254 $ 48,952 $ 140,553 $ 137,994 Common shareholder dividends (14,927 ) (13,983 ) (45,149 ) (42,864 ) Dividends on unvested share-based payment awards (164 ) (140 ) (450 ) (435 ) Undistributed earnings $ 32,163 $ 34,829 $ 94,954 $ 94,695 Undistributed earnings allocated to common shareholders $ 31,813 $ 34,481 $ 93,961 $ 93,862 Undistributed earnings allocated to unvested share-based payment awards 350 348 993 833 Undistributed earnings $ 32,163 $ 34,829 $ 94,954 $ 94,695 Basic Distributed earnings to common shareholders $ 14,927 $ 13,983 $ 45,149 $ 42,864 Undistributed earnings allocated to common shareholders 31,813 34,481 93,961 93,862 Total common shareholders earnings, basic $ 46,740 $ 48,464 $ 139,110 $ 136,726 Diluted Distributed earnings to common shareholders $ 14,927 $ 13,983 $ 45,149 $ 42,864 Undistributed earnings allocated to common shareholders 31,813 34,481 93,961 93,862 Total common shareholders earnings, diluted $ 46,740 $ 48,464 $ 139,110 $ 136,726 Weighted average common shares outstanding 148,614 155,925 149,524 159,090 Effect of dilutive common stock instruments 1,185 1,066 1,180 903 Diluted weighted average common shares outstanding 149,799 156,991 150,704 159,993 Basic earnings per common share $ 0.31 $ 0.31 $ 0.93 $ 0.86 Diluted earnings per common share $ 0.31 $ 0.31 $ 0.92 $ 0.85

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Fair value assumptions of stock options	2015 2014 Dividend yield 2.00 % 2.00 % Risk-free interest rate 2.00 % 2.00 % Weighted average expected volatility 20.00 % 20.00 % Weighted average expected life 6 years 6 years Weighted average per share fair value of options $3.08 $3.00
Summary of Company's Stock Option Activities	Stock Options Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (000s) Outstanding at December 31, 2013 8,034,243 $18.37 Granted 1,389,452 $17.45 Exercised (933,143 ) $13.77 Forfeited or expired (643,214 ) $23.50 Outstanding at December 31, 2014 7,847,338 $18.34 5.79 $ 23,986 Options exercisable at December 31, 2014 5,076,676 $19.96 4.41 $ 14,953 Granted 1,348,504 $17.95 Exercised (1,019,935 ) $13.85 Forfeited or expired (771,382 ) $27.19 Outstanding at September 30, 2015 7,404,525 $17.97 6.05 $ 15,962 Options exercisable at September 30, 2015 4,957,789 $18.38 4.73 $ 13,589
Summary of Company's Nonvested Stock Option Activities	Nonvested Stock Options Shares Weighted Average Grant Date Fair Value Nonvested at December 31, 2013 3,110,523 $4.69 Granted 1,389,452 $3.00 Vested (1,522,152 ) $4.92 Forfeited (207,161 ) $4.38 Nonvested at December 31, 2014 2,770,662 $3.74 Granted 1,348,504 $3.08 Vested (1,451,871 ) $4.20 Forfeited (220,559 ) $3.28 Nonvested at September 30, 2015 2,446,736 $3.15
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)	Restricted Stock Shares Weighted Average Grant Date Fair Value Outstanding at December 31, 2013 1,511,765 $13.92 Granted 1,177,168 $17.35 Vested (538,877 ) $14.12 Forfeited (167,930 ) $15.26 Outstanding at December 31, 2014 1,982,126 $15.79 Granted 1,165,087 $18.05 Vested (694,711 ) $15.59 Forfeited (171,293 ) $16.80 Outstanding at September 30, 2015 2,281,209 $17.01

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	September 30, 2015: Amortized cost Gross unrealized gains Gross unrealized losses Fair value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities $ 999 $ 3 $ — $ 1,002 Obligations of state and political subdivisions ("municipal securities") 409,529 18,176 (4 ) 427,701 Residential mortgage-related securities: FNMA / FHLMC 1,932,740 52,232 (4,182 ) 1,980,790 GNMA 1,106,601 4,106 (2,574 ) 1,108,133 Private-label 1,755 1 (10 ) 1,746 GNMA commercial mortgage-related securities 1,885,776 6,461 (14,656 ) 1,877,581 Other securities (debt and equity) 6,640 63 — 6,703 Total investment securities available for sale $ 5,344,040 $ 81,042 $ (21,426 ) $ 5,403,656 Investment securities held to maturity: Municipal securities $ 604,799 $ 10,023 $ (1,450 ) $ 613,372 Total investment securities held to maturity $ 604,799 $ 10,023 $ (1,450 ) $ 613,372 December 31, 2014: Amortized Gross Gross Fair value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities $ 999 $ — $ (1 ) $ 998 Municipal securities 560,839 21,869 (29 ) 582,679 Residential mortgage-related securities: FNMA / FHLMC 3,534,240 59,640 (30,423 ) 3,563,457 GNMA 165,863 1,596 (127 ) 167,332 Private-label 2,297 7 (10 ) 2,294 GNMA commercial mortgage-related securities 1,097,913 1,922 (25,942 ) 1,073,893 Other securities (debt and equity) 6,108 51 — 6,159 Total investment securities available for sale $ 5,368,259 $ 85,085 $ (56,532 ) $ 5,396,812 Investment securities held to maturity: Municipal securities $ 404,455 $ 9,444 $ (832 ) $ 413,067 Total investment securities held to maturity $ 404,455 $ 9,444 $ (832 ) $ 413,067
Investment securities held to maturity	September 30, 2015: Amortized cost Gross unrealized gains Gross unrealized losses Fair value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities $ 999 $ 3 $ — $ 1,002 Obligations of state and political subdivisions ("municipal securities") 409,529 18,176 (4 ) 427,701 Residential mortgage-related securities: FNMA / FHLMC 1,932,740 52,232 (4,182 ) 1,980,790 GNMA 1,106,601 4,106 (2,574 ) 1,108,133 Private-label 1,755 1 (10 ) 1,746 GNMA commercial mortgage-related securities 1,885,776 6,461 (14,656 ) 1,877,581 Other securities (debt and equity) 6,640 63 — 6,703 Total investment securities available for sale $ 5,344,040 $ 81,042 $ (21,426 ) $ 5,403,656 Investment securities held to maturity: Municipal securities $ 604,799 $ 10,023 $ (1,450 ) $ 613,372 Total investment securities held to maturity $ 604,799 $ 10,023 $ (1,450 ) $ 613,372 December 31, 2014: Amortized Gross Gross Fair value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities $ 999 $ — $ (1 ) $ 998 Municipal securities 560,839 21,869 (29 ) 582,679 Residential mortgage-related securities: FNMA / FHLMC 3,534,240 59,640 (30,423 ) 3,563,457 GNMA 165,863 1,596 (127 ) 167,332 Private-label 2,297 7 (10 ) 2,294 GNMA commercial mortgage-related securities 1,097,913 1,922 (25,942 ) 1,073,893 Other securities (debt and equity) 6,108 51 — 6,159 Total investment securities available for sale $ 5,368,259 $ 85,085 $ (56,532 ) $ 5,396,812 Investment securities held to maturity: Municipal securities $ 404,455 $ 9,444 $ (832 ) $ 413,067 Total investment securities held to maturity $ 404,455 $ 9,444 $ (832 ) $ 413,067
Amortized cost and fair values of investment securities available for sale and held to maturity by contractual maturity	Available for Sale Held to Maturity ($ in Thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 39,763 $ 40,025 $ — $ — Due after one year through five years 236,730 248,772 3,980 4,042 Due after five years through ten years 140,072 145,956 133,801 136,164 Due after ten years 585 599 467,018 473,166 Total debt securities 417,150 435,352 604,799 613,372 Residential mortgage-related securities: FNMA / FHLMC 1,932,740 1,980,790 — — GNMA 1,106,601 1,108,133 — — Private-label 1,755 1,746 — — GSE commercial mortgage-related securities 1,885,776 1,877,581 — — Equity securities 18 54 — — Total investment securities $ 5,344,040 $ 5,403,656 $ 604,799 $ 613,372 Ratio of Fair Value to Amortized Cost 101.1 % 101.4 %
Schedule of Realized Gain (Loss)	Nine Months Ended September 30, Year Ended December 31, 2015 2014 2014 ($ in Thousands) Gross gains $ 8,047 $ 1,159 $ 1,184 Gross losses (4,009 ) (690 ) (690 ) Investment securities gains, net $ 4,038 $ 469 $ 494 Proceeds from sales of investment securities $ 1,206,242 $ 101,987 $ 102,011
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length	Less than 12 months 12 months or more Total September 30, 2015 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: Municipal securities 2 $ (2 ) $ 628 1 $ (2 ) $ 186 $ (4 ) $ 814 Residential mortgage-related securities: GSE 51 (2,894 ) 854,924 20 (3,862 ) 374,787 (6,756 ) 1,229,711 Private-label 1 — 90 3 (10 ) 1,591 (10 ) 1,681 GSE commercial mortgage-related securities 15 (1,411 ) 526,820 20 (13,245 ) 445,030 (14,656 ) 971,850 Total $ (4,307 ) $ 1,382,462 $ (17,119 ) $ 821,594 $ (21,426 ) $ 2,204,056 Investment securities held to maturity: Municipal securities 244 $ (1,180 ) $ 112,223 20 $ (270 ) $ 9,405 $ (1,450 ) $ 121,628 Total $ (1,180 ) $ 112,223 $ (270 ) $ 9,405 $ (1,450 ) $ 121,628 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2014 . Less than 12 months 12 months or more Total December 31, 2014 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: U.S. Treasury securities 1 $ (1 ) $ 998 — $ — $ — $ (1 ) $ 998 Municipal securities 6 (9 ) 3,374 6 (20 ) 2,133 (29 ) 5,507 Residential mortgage-related securities: GSE 16 (1,404 ) 333,713 56 (29,146 ) 1,256,533 (30,550 ) 1,590,246 Private-label 1 (9 ) 1,772 2 (1 ) 27 (10 ) 1,799 GSE commercial mortgage-related securities 9 (1,766 ) 329,982 20 (24,176 ) 460,425 (25,942 ) 790,407 Total $ (3,189 ) $ 669,839 $ (53,343 ) $ 1,719,118 $ (56,532 ) $ 2,388,957 Investment securities held to maturity: Municipal securities 74 $ (216 ) $ 31,924 85 $ (616 ) $ 38,915 $ (832 ) $ 70,839 Total $ (216 ) $ 31,924 $ (616 ) $ 38,915 $ (832 ) $ 70,839

Loans, Allowance for Credit L30

Loans, Allowance for Credit Losses, and Credit Quality (Tables)	9 Months Ended
	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Loan composition	September 30, December 31, ($ in Thousands) Commercial and industrial $ 6,085,473 $ 5,905,902 Commercial real estate - owner occupied 966,689 1,007,937 Lease financing 42,607 51,529 Commercial and business lending 7,094,769 6,965,368 Commercial real estate - investor 3,183,352 3,056,485 Real estate construction 1,124,280 1,008,956 Commercial real estate lending 4,307,632 4,065,441 Total commercial 11,402,401 11,030,809 Home equity 1,014,465 1,051,927 Installment and credit cards 425,729 454,219 Residential mortgage 5,682,178 5,056,891 Total consumer 7,122,372 6,563,037 Total loans $ 18,524,773 $ 17,593,846
Changes in the allowance for loan losses	Nine Months Ended Year Ended ($ in Thousands) Allowance for Loan Losses: Balance at beginning of period $ 266,302 $ 268,315 Provision for loan losses 18,500 13,000 Charge offs (39,539 ) (44,096 ) Recoveries 17,273 29,083 Net charge offs (22,266 ) (15,013 ) Balance at end of period $ 262,536 $ 266,302 Allowance for Unfunded Commitments: Balance at beginning of period $ 24,900 $ 21,900 Provision for unfunded commitments (1,000 ) 3,000 Balance at end of period $ 23,900 $ 24,900 Allowance for Credit Losses $ 286,436 $ 291,202
Changes in the allowance for loan losses by portfolio segment	$ in Thousands Commercial and industrial Commercial real estate - owner occupied Lease financing Commercial real estate - investor Real estate construction Home equity Installment and credit cards Residential mortgage Total Balance at Dec 31, 2013 $ 104,501 $ 19,476 $ 1,607 $ 58,156 $ 23,418 $ 27,932 $ 2,416 $ 30,809 $ 268,315 Provision for loan losses 14,767 (1,296 ) 35 (17,290 ) (1,277 ) 6,278 6,279 5,504 13,000 Charge offs (14,633 ) (3,476 ) (39 ) (4,529 ) (1,958 ) (10,946 ) (2,876 ) (5,639 ) (44,096 ) Recoveries 11,390 1,806 7 9,996 816 3,200 616 1,252 29,083 Balance at Dec 31, 2014 $ 116,025 $ 16,510 $ 1,610 $ 46,333 $ 20,999 $ 26,464 $ 6,435 $ 31,926 $ 266,302 Allowance for loan losses: Ending balance impaired loans individually evaluated for impairment $ 13,615 $ 1,490 $ 574 $ 1,649 $ 328 $ 11 $ — $ 199 $ 17,866 Ending balance impaired loans collectively evaluated for impairment 2,852 1,731 — 1,938 767 11,371 308 13,598 32,565 Total impaired loans $ 16,467 $ 3,221 $ 574 $ 3,587 $ 1,095 $ 11,382 $ 308 $ 13,797 $ 50,431 Ending balance all other loans collectively evaluated for impairment 99,558 13,289 1,036 42,746 19,904 15,082 6,127 18,129 215,871 Total $ 116,025 $ 16,510 $ 1,610 $ 46,333 $ 20,999 $ 26,464 $ 6,435 $ 31,926 $ 266,302 Loans: Ending balance impaired loans individually evaluated for impairment $ 45,118 $ 20,731 $ 1,801 $ 19,683 $ 3,776 $ 962 $ — $ 9,751 $ 101,822 Ending balance impaired loans collectively evaluated for impairment 38,437 15,548 — 26,129 2,350 23,698 1,587 66,058 173,807 Total impaired loans $ 83,555 $ 36,279 $ 1,801 $ 45,812 $ 6,126 $ 24,660 $ 1,587 $ 75,809 $ 275,629 Ending balance all other loans collectively evaluated for impairment 5,822,347 971,658 49,728 3,010,673 1,002,830 1,027,267 452,632 4,981,082 17,318,217 Total $ 5,905,902 $ 1,007,937 $ 51,529 $ 3,056,485 $ 1,008,956 $ 1,051,927 $ 454,219 $ 5,056,891 $ 17,593,846 $ in Thousands Commercial and industrial Commercial real estate - owner occupied Lease financing Commercial real estate - investor Real estate construction Home equity Installment and credit cards Residential mortgage Total Balance at Dec 31, 2014 $ 116,025 $ 16,510 $ 1,610 $ 46,333 $ 20,999 $ 26,464 $ 6,435 $ 31,926 $ 266,302 Provision for loan losses 15,749 7,245 (835 ) (2,703 ) (1,314 ) (987 ) 1,284 61 18,500 Charge offs (19,672 ) (2,325 ) — (3,947 ) (546 ) (5,466 ) (2,934 ) (4,649 ) (39,539 ) Recoveries 6,392 892 — 4,124 1,924 2,568 569 804 17,273 Balance at Sep 30, 2015 $ 118,494 $ 22,322 $ 775 $ 43,807 $ 21,063 $ 22,579 $ 5,354 $ 28,142 $ 262,536 Allowance for loan losses: Ending balance impaired loans individually evaluated for impairment $ 5,922 $ — $ — $ 197 $ — $ 3 $ — $ 171 $ 6,293 Ending balance impaired loans collectively evaluated for impairment 977 571 — 1,152 474 9,652 210 12,384 25,420 Total impaired loans $ 6,899 $ 571 $ — $ 1,349 $ 474 $ 9,655 $ 210 $ 12,555 $ 31,713 Ending balance all other loans collectively evaluated for impairment 111,595 21,751 775 42,458 20,589 12,924 5,144 15,587 230,823 Total $ 118,494 $ 22,322 $ 775 $ 43,807 $ 21,063 $ 22,579 $ 5,354 $ 28,142 $ 262,536 Loans: Ending balance impaired loans individually evaluated for impairment $ 55,148 $ 11,174 $ 1,763 $ 3,822 $ — $ 170 $ — $ 6,877 $ 78,954 Ending balance impaired loans collectively evaluated for impairment 31,871 9,537 — 21,679 1,482 20,416 1,190 65,134 151,309 Total impaired loans $ 87,019 $ 20,711 $ 1,763 $ 25,501 $ 1,482 $ 20,586 $ 1,190 $ 72,011 $ 230,263 Ending balance all other loans collectively evaluated for impairment 5,998,454 945,978 40,844 3,157,851 1,122,798 993,879 424,539 5,610,167 18,294,510 Total $ 6,085,473 $ 966,689 $ 42,607 $ 3,183,352 $ 1,124,280 $ 1,014,465 $ 425,729 $ 5,682,178 $ 18,524,773
Summarized details of Loans	30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Total Past Due Current Total ($ in Thousands) Accruing loans Commercial and industrial $ 1,133 $ 1,788 $ 178 $ 3,099 $ 6,023,953 $ 6,027,052 Commercial real estate - owner occupied 1,173 845 — 2,018 951,303 953,321 Lease financing 375 — — 375 40,469 40,844 Commercial and business lending 2,681 2,633 178 5,492 7,015,725 7,021,217 Commercial real estate - investor 1,104 114 — 1,218 3,175,213 3,176,431 Real estate construction 312 61 — 373 1,122,910 1,123,283 Commercial real estate lending 1,416 175 — 1,591 4,298,123 4,299,714 Total commercial 4,097 2,808 178 7,083 11,313,848 11,320,931 Home equity 7,413 1,152 — 8,565 992,259 1,000,824 Installment and credit cards 1,162 561 1,306 3,029 422,314 425,343 Residential mortgage 4,345 466 — 4,811 5,625,410 5,630,221 Total consumer 12,920 2,179 1,306 16,405 7,039,983 7,056,388 Total accruing loans $ 17,017 $ 4,987 $ 1,484 $ 23,488 $ 18,353,831 $ 18,377,319 Nonaccrual loans Commercial and industrial $ 27 $ 1,379 $ 9,711 $ 11,117 $ 47,304 $ 58,421 Commercial real estate - owner occupied 195 — 3,641 3,836 9,532 13,368 Lease financing — — — — 1,763 1,763 Commercial and business lending 222 1,379 13,352 14,953 58,599 73,552 Commercial real estate - investor — — 3,565 3,565 3,356 6,921 Real estate construction 61 108 445 614 383 997 Commercial real estate lending 61 108 4,010 4,179 3,739 7,918 Total commercial 283 1,487 17,362 19,132 62,338 81,470 Home equity 1,899 1,228 4,744 7,871 5,770 13,641 Installment and credit cards 47 23 164 234 152 386 Residential mortgage 4,675 4,215 19,946 28,836 23,121 51,957 Total consumer 6,621 5,466 24,854 36,941 29,043 65,984 Total nonaccrual loans (b) $ 6,904 $ 6,953 $ 42,216 $ 56,073 $ 91,381 $ 147,454 Total loans Commercial and industrial $ 1,160 $ 3,167 $ 9,889 $ 14,216 $ 6,071,257 $ 6,085,473 Commercial real estate - owner occupied 1,368 845 3,641 5,854 960,835 966,689 Lease financing 375 — — 375 42,232 42,607 Commercial and business lending 2,903 4,012 13,530 20,445 7,074,324 7,094,769 Commercial real estate - investor 1,104 114 3,565 4,783 3,178,569 3,183,352 Real estate construction 373 169 445 987 1,123,293 1,124,280 Commercial real estate lending 1,477 283 4,010 5,770 4,301,862 4,307,632 Total commercial 4,380 4,295 17,540 26,215 11,376,186 11,402,401 Home equity 9,312 2,380 4,744 16,436 998,029 1,014,465 Installment and credit cards 1,209 584 1,470 3,263 422,466 425,729 Residential mortgage 9,020 4,681 19,946 33,647 5,648,531 5,682,178 Total consumer 19,541 7,645 26,160 53,346 7,069,026 7,122,372 Total loans $ 23,921 $ 11,940 $ 43,700 $ 79,561 $ 18,445,212 $ 18,524,773 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $1 million at September 30, 2015 (the same as the reported balances for the accruing loans noted above). (b) The percent of nonaccrual loans which are current was 62% at September 30, 2015 . The following table presents loans by past due status at December 31, 2014 . 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Total Past Due Current Total ($ in Thousands) Accruing loans Commercial and industrial $ 4,466 $ 10,281 $ 254 $ 15,001 $ 5,841,238 $ 5,856,239 Commercial real estate - owner occupied 8,429 2,199 — 10,628 971,484 982,112 Lease financing — — — — 49,728 49,728 Commercial and business lending 12,895 12,480 254 25,629 6,862,450 6,888,079 Commercial real estate - investor 712 496 — 1,208 3,032,592 3,033,800 Real estate construction 951 33 — 984 1,002,573 1,003,557 Commercial real estate lending 1,663 529 — 2,192 4,035,165 4,037,357 Total commercial 14,558 13,009 254 27,821 10,897,615 10,925,436 Home equity 6,988 1,795 52 8,835 1,026,641 1,035,476 Installment and credit cards 1,186 746 1,317 3,249 450,357 453,606 Residential mortgage 3,889 957 — 4,846 4,997,069 5,001,915 Total consumer 12,063 3,498 1,369 16,930 6,474,067 6,490,997 Total accruing loans $ 26,621 $ 16,507 $ 1,623 $ 44,751 $ 17,371,682 $ 17,416,433 Nonaccrual loans Commercial and industrial $ 872 $ 627 $ 10,154 $ 11,653 $ 38,010 $ 49,663 Commercial real estate - owner occupied 3,197 41 8,596 11,834 13,991 25,825 Lease financing — — 513 513 1,288 1,801 Commercial and business lending 4,069 668 19,263 24,000 53,289 77,289 Commercial real estate - investor 1,857 459 12,765 15,081 7,604 22,685 Real estate construction 87 73 798 958 4,441 5,399 Commercial real estate lending 1,944 532 13,563 16,039 12,045 28,084 Total commercial 6,013 1,200 32,826 40,039 65,334 105,373 Home equity 1,471 1,766 6,840 10,077 6,374 16,451 Installment and credit cards 96 39 141 276 337 613 Residential mortgage 5,172 3,193 23,492 31,857 23,119 54,976 Total consumer 6,739 4,998 30,473 42,210 29,830 72,040 Total nonaccrual loans (b) $ 12,752 $ 6,198 $ 63,299 $ 82,249 $ 95,164 $ 177,413 Total loans Commercial and industrial $ 5,338 $ 10,908 $ 10,408 $ 26,654 $ 5,879,248 $ 5,905,902 Commercial real estate - owner occupied 11,626 2,240 8,596 22,462 985,475 1,007,937 Lease financing — — 513 513 51,016 51,529 Commercial and business lending 16,964 13,148 19,517 49,629 6,915,739 6,965,368 Commercial real estate - investor 2,569 955 12,765 16,289 3,040,196 3,056,485 Real estate construction 1,038 106 798 1,942 1,007,014 1,008,956 Commercial real estate lending 3,607 1,061 13,563 18,231 4,047,210 4,065,441 Total commercial 20,571 14,209 33,080 67,860 10,962,949 11,030,809 Home equity 8,459 3,561 6,892 18,912 1,033,015 1,051,927 Installment and credit cards 1,282 785 1,458 3,525 450,694 454,219 Residential mortgage 9,061 4,150 23,492 36,703 5,020,188 5,056,891 Total consumer 18,802 8,496 31,842 59,140 6,503,897 6,563,037 Total loans $ 39,373 $ 22,705 $ 64,922 $ 127,000 $ 17,466,846 $ 17,593,846 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2014 (the same as the reported balances for the accruing loans noted above). (b) The percent of nonaccrual loans which are current was 54% at December 31, 2014 .
Summarized details of impaired Loans	Recorded Investment Unpaid Principal Balance Related Allowance YTD Average Recorded Investment YTD Interest Income Recognized (a) ($ in Thousands) Loans with a related allowance Commercial and industrial $ 58,855 $ 60,303 $ 6,899 $ 59,502 $ 970 Commercial real estate - owner occupied 9,537 9,660 571 9,784 274 Lease financing — — — — — Commercial and business lending 68,392 69,963 7,470 69,286 1,244 Commercial real estate - investor 23,916 25,594 1,349 24,119 834 Real estate construction 1,482 2,112 474 1,643 42 Commercial real estate lending 25,398 27,706 1,823 25,762 876 Total commercial 93,790 97,669 9,293 95,048 2,120 Home equity 20,526 22,682 9,655 21,207 816 Installment and credit cards 1,190 1,292 210 1,252 25 Residential mortgage 67,333 72,537 12,555 68,551 1,731 Total consumer 89,049 96,511 22,420 91,010 2,572 Total loans $ 182,839 $ 194,180 $ 31,713 $ 186,058 $ 4,692 Loans with no related allowance Commercial and industrial $ 28,164 $ 29,187 $ — $ 32,848 $ 548 Commercial real estate - owner occupied 11,174 11,571 — 11,594 89 Lease financing 1,763 1,763 — 1,980 — Commercial and business lending 41,101 42,521 — 46,422 637 Commercial real estate - investor 1,585 1,675 — 1,596 34 Real estate construction — — — — — Commercial real estate lending 1,585 1,675 — 1,596 34 Total commercial 42,686 44,196 — 48,018 671 Home equity 60 60 — 60 1 Installment and credit cards — — — — — Residential mortgage 4,678 4,932 — 4,700 57 Total consumer 4,738 4,992 — 4,760 58 Total loans $ 47,424 $ 49,188 $ — $ 52,778 $ 729 Total impaired loans Commercial and industrial $ 87,019 $ 89,490 $ 6,899 $ 92,350 $ 1,518 Commercial real estate - owner occupied 20,711 21,231 571 21,378 363 Lease financing 1,763 1,763 — 1,980 — Commercial and business lending 109,493 112,484 7,470 115,708 1,881 Commercial real estate - investor 25,501 27,269 1,349 25,715 868 Real estate construction 1,482 2,112 474 1,643 42 Commercial real estate lending 26,983 29,381 1,823 27,358 910 Total commercial 136,476 141,865 9,293 143,066 2,791 Home equity 20,586 22,742 9,655 21,267 817 Installment and credit cards 1,190 1,292 210 1,252 25 Residential mortgage 72,011 77,469 12,555 73,251 1,788 Total consumer 93,787 101,503 22,420 95,770 2,630 Total impaired loans (b) $ 230,263 $ 243,368 $ 31,713 $ 238,836 $ 5,421 (a) Interest income recognized included $3 million of interest income recognized on accruing restructured loans for the nine months ended September 30, 2015 . (b) The implied fair value mark on all impaired loans at September 30, 2015 was 82% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance. The following table presents impaired loans at December 31, 2014 . Recorded Investment Unpaid Principal Balance Related Allowance YTD Average Recorded Investment YTD Interest Income Recognized (a) ($ in Thousands) Loans with a related allowance Commercial and industrial $ 76,433 $ 80,414 $ 16,467 $ 80,004 $ 3,139 Commercial real estate - owner occupied 19,839 21,807 3,221 20,878 681 Lease financing 1,801 1,801 574 2,009 — Commercial and business lending 98,073 104,022 20,262 102,891 3,820 Commercial real estate - investor 36,841 40,869 3,587 38,657 1,250 Real estate construction 3,043 5,910 1,095 3,818 105 Commercial real estate lending 39,884 46,779 4,682 42,475 1,355 Total commercial 137,957 150,801 24,944 145,366 5,175 Home equity 23,874 26,585 11,382 25,087 1,257 Installment and credit cards 1,587 1,795 308 1,736 58 Residential mortgage 68,748 74,005 13,797 70,030 2,307 Total consumer 94,209 102,385 25,487 96,853 3,622 Total loans $ 232,166 $ 253,186 $ 50,431 $ 242,219 $ 8,797 Loans with no related allowance Commercial and industrial $ 7,122 $ 12,634 $ — $ 8,851 $ 82 Commercial real estate - owner occupied 16,440 19,019 — 17,970 219 Lease financing — — — — — Commercial and business lending 23,562 31,653 — 26,821 301 Commercial real estate - investor 8,971 14,036 — 10,014 133 Real estate construction 3,083 3,815 — 3,241 — Commercial real estate lending 12,054 17,851 — 13,255 133 Total commercial 35,616 49,504 — 40,076 434 Home equity 786 806 — 851 18 Installment and credit cards — — — — — Residential mortgage 7,061 7,315 — 7,224 135 Total consumer 7,847 8,121 — 8,075 153 Total loans $ 43,463 $ 57,625 $ — $ 48,151 $ 587 Total impaired loans Commercial and industrial $ 83,555 $ 93,048 $ 16,467 $ 88,855 $ 3,221 Commercial real estate - owner occupied 36,279 40,826 3,221 38,848 900 Lease financing 1,801 1,801 574 2,009 — Commercial and business lending 121,635 135,675 20,262 129,712 4,121 Commercial real estate - investor 45,812 54,905 3,587 48,671 1,383 Real estate construction 6,126 9,725 1,095 7,059 105 Commercial real estate lending 51,938 64,630 4,682 55,730 1,488 Total commercial 173,573 200,305 24,944 185,442 5,609 Home equity 24,660 27,391 11,382 25,938 1,275 Installment and credit cards 1,587 1,795 308 1,736 58 Residential mortgage 75,809 81,320 13,797 77,254 2,442 Total consumer 102,056 110,506 25,487 104,928 3,775 Total impaired loans (b) $ 275,629 $ 310,811 $ 50,431 $ 290,370 $ 9,384 (a) Interest income recognized included $5 million of interest income recognized on accruing restructured loans for the year ended December 31, 2014 . (b) The implied fair value mark on all impaired loans at December 31, 2014 was 72% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.
Nonaccrual and Performing Restructured Loans	September 30, 2015 December 31, 2014 Performing Restructured Loans Nonaccrual Restructured Loans * Performing Restructured Loans Nonaccrual Restructured Loans * ($ in Thousands) Commercial and industrial $ 28,598 $ 1,946 $ 33,892 $ 3,260 Commercial real estate - owner occupied 7,343 2,796 10,454 5,656 Commercial real estate - investor 18,580 4,268 23,127 15,216 Real estate construction 485 173 727 2,438 Home equity 6,945 4,137 8,209 4,838 Installment and credit cards 804 65 974 199 Residential mortgage 20,054 23,198 20,833 26,049 Total $ 82,809 $ 36,583 $ 98,216 $ 57,656 * Nonaccrual restructured loans have been included with nonaccrual loans.
Summary of Restructured Loans	Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) ($ in Thousands) Commercial and industrial 5 $ 893 $ 896 10 $ 2,410 $ 3,033 Commercial real estate - owner occupied — — — 4 2,847 3,007 Commercial real estate - investor 2 711 761 3 2,949 2,998 Real estate construction — — — 1 5 5 Home equity 27 840 940 61 2,109 2,220 Residential mortgage 33 2,612 2,721 77 7,393 7,586 Total 67 $ 5,056 $ 5,318 156 $ 17,713 $ 18,849 (1) Represents post-modification outstanding recorded investment. (2) Represents pre-modification outstanding recorded investment. Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) ($ in Thousands) Commercial and industrial 10 $ 7,383 $ 7,384 13 $ 7,695 $ 7,707 Commercial real estate - owner occupied — — — 2 1,123 1,260 Commercial real estate - investor 3 5,603 5,918 4 6,096 6,425 Real estate construction 1 8 8 2 14 14 Home equity 38 1,121 1,179 85 2,784 2,970 Installment and credit cards 2 25 25 3 34 45 Residential mortgage 49 4,364 4,654 94 8,627 9,178 Total 103 $ 18,504 $ 19,168 203 $ 26,373 $ 27,599 (1) Represents post-modification outstanding recorded investment. (2) Represents pre-modification outstanding recorded investment.
Troubled Debt Restructurings Subsequent Default	Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Number of Loans Recorded Investment Number of Recorded ($ in Thousands) Commercial and industrial 1 $ 153 1 $ 153 Commercial real estate - owner occupied — — 1 297 Home equity 14 421 21 627 Residential mortgage 18 1,858 45 4,176 Total 33 $ 2,432 68 $ 5,253 Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 Number of Loans Recorded Investment Number of Recorded ($ in Thousands) Commercial and industrial — $ — 1 $ 52 Commercial real estate - owner occupied — — 2 203 Commercial real estate - investor 1 493 2 1,613 Real estate construction — — 1 160 Home equity 11 312 20 598 Installment and credit cards 1 10 3 34 Residential mortgage 19 1,557 55 5,084 Total 32 $ 2,372 84 $ 7,744
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Commercial and Consumer loans by credit quality indicator	Pass Special Mention Potential Problem Impaired Total ($ in Thousands) Commercial and industrial $ 5,487,926 $ 318,587 $ 191,941 $ 87,019 $ 6,085,473 Commercial real estate - owner occupied 874,566 29,946 41,466 20,711 966,689 Lease financing 39,987 624 233 1,763 42,607 Commercial and business lending 6,402,479 349,157 233,640 109,493 7,094,769 Commercial real estate - investor 3,089,760 44,458 23,633 25,501 3,183,352 Real estate construction 1,120,173 271 2,354 1,482 1,124,280 Commercial real estate lending 4,209,933 44,729 25,987 26,983 4,307,632 Total commercial $ 10,612,412 $ 393,886 $ 259,627 $ 136,476 $ 11,402,401 The following table presents commercial loans by credit quality indicator at December 31, 2014 . Pass Special Mention Potential Problem Impaired Total ($ in Thousands) Commercial and industrial $ 5,594,497 $ 119,328 $ 108,522 $ 83,555 $ 5,905,902 Commercial real estate - owner occupied 904,526 18,437 48,695 36,279 1,007,937 Lease financing 46,931 88 2,709 1,801 51,529 Commercial and business lending 6,545,954 137,853 159,926 121,635 6,965,368 Commercial real estate - investor 2,974,493 12,137 24,043 45,812 3,056,485 Real estate construction 998,972 2,082 1,776 6,126 1,008,956 Commercial real estate lending 3,973,465 14,219 25,819 51,938 4,065,441 Total commercial $ 10,519,419 $ 152,072 $ 185,745 $ 173,573 $ 11,030,809
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Commercial and Consumer loans by credit quality indicator	Performing 30-89 Days Past Due Potential Problem Impaired Total ($ in Thousands) Home equity $ 985,087 $ 8,565 $ 227 $ 20,586 $ 1,014,465 Installment and credit cards 422,816 1,723 — 1,190 425,729 Residential mortgage 5,601,390 4,811 3,966 72,011 5,682,178 Total consumer $ 7,009,293 $ 15,099 $ 4,193 $ 93,787 $ 7,122,372 The following table presents consumer loans by credit quality indicator at December 31, 2014 . Performing 30-89 Days Past Due Potential Problem Impaired Total ($ in Thousands) Home equity $ 1,017,604 $ 8,783 $ 880 $ 24,660 $ 1,051,927 Installment and credit cards 450,698 1,932 2 1,587 454,219 Residential mortgage 4,972,455 4,846 3,781 75,809 5,056,891 Total consumer $ 6,440,757 $ 15,561 $ 4,663 $ 102,056 $ 6,563,037

Goodwill and Other Intangible31

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	Nine Months Ended Year Ended December 31, 2014 ($ in Thousands) Core deposit intangibles: Gross carrying amount $ 36,230 $ 36,230 Accumulated amortization (35,759 ) (34,433 ) Net book value $ 471 $ 1,797 Amortization during the period $ 1,326 $ 2,868 Other intangibles: Gross carrying amount $ 31,398 $ 19,283 Accumulated amortization (14,891 ) (13,643 ) Net book value $ 16,507 $ 5,640 Additions during the period $ 12,115 $ — Amortization during the period $ 1,248 $ 879
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance	Nine Months Ended September 30, 2015 Year Ended December 31, 2014 ($ in Thousands) Mortgage servicing rights: Mortgage servicing rights at beginning of period $ 61,379 $ 64,193 Additions 9,853 8,253 Amortization (8,902 ) (11,067 ) Mortgage servicing rights at end of period $ 62,330 $ 61,379 Valuation allowance at beginning of period (1,234 ) (913 ) (Additions) recoveries, net 306 (321 ) Valuation allowance at end of period (928 ) (1,234 ) Mortgage servicing rights, net $ 61,402 $ 60,145 Fair value of mortgage servicing rights $ 67,794 $ 66,342 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,906,960 $ 7,999,294 Mortgage servicing rights, net to servicing portfolio 0.78 % 0.75 % Mortgage servicing rights expense (1) $ 8,596 $ 11,388 (1) Includes the amortization of mortgage servicing rights and additions/recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net, in the consolidated statements of income.
Summary of estimated future amortization expense	Estimated amortization expense: Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights ($ in Thousands) Three months ending December 31, 2015 $ 78 $ 442 $ 2,869 Year ending December 31, 2016 281 1,735 10,147 Year ending December 31, 2017 112 1,702 8,341 Year ending December 31, 2018 — 1,672 6,919 Year ending December 31, 2019 — 1,373 5,781 Year ending December 31, 2020 — 1,256 4,842 Beyond 2020 — 8,327 23,431 Total Estimated Amortization Expense $ 471 $ 16,507 $ 62,330

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Breakdown of short and long-term debt balances	September 30, 2015 December 31, 2014 ($ in Thousands) Short-Term Funding Federal funds purchased $ 177,940 $ 109,770 Securities sold under agreements to repurchase 524,629 384,221 Federal funds purchased and securities sold under agreements to repurchase $ 702,569 $ 493,991 FHLB advances 260,000 500,000 Commercial paper 59,766 74,297 Other short-term funding 319,766 574,297 Total short-term funding $ 1,022,335 $ 1,068,288 Long-Term Funding FHLB advances $ 1,750,234 $ 3,000,260 Senior notes, at par 680,000 680,000 Subordinated notes, at par 250,000 250,000 Other long-term funding and capitalized costs (692 ) (143 ) Total long-term funding 2,679,542 3,930,117 Total short and long-term funding $ 3,701,877 $ 4,998,405
Remaining contractual maturity of securities sold under agreements to repurchase	Remaining Contractual Maturity of the Agreements September 30, 2015 Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total ($ in Thousands) Repurchase agreements GSE securities $ 524,629 $ — $ — $ — $ 524,629 Total $ 524,629 $ — $ — $ — $ 524,629 Gross amounts of recognized liabilities for repurchase agreements $ 524,629

Derivative and Hedging Activi33

Derivative and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Balance sheet category and fair values of derivative instruments not designated as hedging instruments	Weighted Average ($ in Thousands) Notional Amount Fair Value Balance Sheet Category Receive Rate (1) Pay Rate (1) Maturity September 30, 2015 Interest rate-related instruments — customer and mirror $ 1,706,721 $ 42,593 Trading assets 1.42% 1.42% 41 months Interest rate-related instruments — customer and mirror 1,706,721 (44,857 ) Trading liabilities 1.42% 1.42% 41 months Interest rate lock commitments (mortgage) 173,622 2,584 Other assets -- -- --- Forward commitments (mortgage) 245,138 (1,982 ) Other liabilities -- -- --- Foreign currency exchange forwards 54,421 1,159 Trading assets -- -- --- Foreign currency exchange forwards 46,201 (960 ) Trading liabilities -- -- --- Purchased options (time deposit) 105,345 2,915 Other assets -- -- --- Written options (time deposit) 105,345 (2,915 ) Other liabilities -- -- --- December 31, 2014 Interest rate-related instruments — customer and mirror $ 1,636,480 $ 33,023 Trading assets 1.60% 1.60% 42 months Interest rate-related instruments — customer and mirror 1,636,480 (35,372 ) Trading liabilities 1.60% 1.60% 42 months Interest rate lock commitments (mortgage) 126,379 1,947 Other assets -- -- --- Forward commitments (mortgage) 234,500 (2,435 ) Other liabilities -- -- --- Foreign currency exchange forwards 60,742 2,140 Trading assets -- -- --- Foreign currency exchange forwards 56,573 (1,957 ) Trading liabilities -- -- --- Purchased options (time deposit) 110,347 6,054 Other assets -- -- --- Written options (time deposit) 110,347 (6,054 ) Other liabilities -- -- --- (1) Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only.
Gain (loss) on derivative instruments not designated as hedging instruments	Income Statement Category of Gain /(Loss) Recognized in Income Gain /(Loss) Recognized in Income ($ in Thousands) Nine Months Ended September 30, 2015 Interest rate-related instruments — customer and mirror, net Capital market fees, net $ 85 Interest rate lock commitments (mortgage) Mortgage banking, net 637 Forward commitments (mortgage) Mortgage banking, net 453 Foreign currency exchange forwards Capital market fees, net 16 Nine Months Ended September 30, 2014 Interest rate-related instruments — customer and mirror, net Capital market fees, net $ 626 Interest rate lock commitments (mortgage) Mortgage banking, net 1,024 Forward commitments (mortgage) Mortgage banking, net (1,924 ) Foreign currency exchange forwards Capital market fees, net 118

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2015
Offsetting [Abstract]
Balance Sheet Offsetting of Derivative Assets and Liabilities	The following table presents the assets and liabilities subject to an enforceable master netting arrangement as of September 30, 2015 and December 31, 2014 . The interest agreements we have with our commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table. Gross amounts recognized Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Gross amounts not offset in the balance sheet Financial instruments Collateral Net amount September 30, 2015 ($ in Thousands) Derivative assets: Interest rate-related instruments $ 48 $ — $ 48 $ (48 ) $ — $ — Derivative liabilities: Interest rate-related instruments $ 44,210 $ — $ 44,210 $ (48 ) $ (42,658 ) $ 1,504 December 31, 2014 Derivative assets: Interest rate-related instruments $ 558 $ — $ 558 $ (558 ) $ — $ — Derivative liabilities: Interest rate-related instruments $ 34,087 $ — $ 34,087 $ (558 ) $ (26,105 ) $ 7,424

Commitments, Off-Balance Shee35

Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	September 30, 2015 December 31, 2014 ($ in Thousands) Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2) $ 6,935,786 $ 6,884,411 Commercial letters of credit (1) 11,484 9,179 Standby letters of credit (3) 317,079 353,292 (1) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at September 30, 2015 or December 31, 2014 . (2) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 11. (3) The Corporation has established a liability of $3 million at September 30, 2015 compared to $4 million at December 31, 2014 , as an estimate of the fair value of these financial instruments.
Summary of changes in the residential mortgage repurchase reserve	For The Nine Months Ended September 30, 2015 For The Year Ended December 31, 2014 ($ in Thousands) Balance at beginning of period $ 3,258 $ 5,737 Repurchase provision expense 340 505 Adjustments to provision expense (2,450 ) (2,250 ) Charge offs (23 ) (734 ) Balance at end of period $ 1,125 $ 3,258

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)	Investment Securities Available for Sale Derivative Financial Instruments ($ in Thousands) Balance December 31, 2013 $ 299 $ 1,717 Total net losses included in income: Mortgage derivative loss — (2,205 ) Sales of investment securities (99 ) — Balance December 31, 2014 $ 200 $ (488 ) Total net gains included in income: Mortgage derivative gain — 1,090 Balance September 30, 2015 $ 200 $ 602
Assets and Liabilities Measured on Nonrecurring Basis at Fair Value	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Fair Value Measurements Using September 30, 2015 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Loans held for sale $ 106,276 $ — $ 106,276 $ — Impaired loans (1) 72,661 — — 72,661 Mortgage servicing rights 67,794 — — 67,794 Fair Value Measurements Using December 31, 2014 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Loans held for sale $ 156,423 $ — $ 156,423 $ — Impaired loans (1) 83,956 — — 83,956 Mortgage servicing rights 66,342 — — 66,342 (1) Represents individually evaluated impaired loans, net of the related allowance for loan losses.
Estimated fair values of financial instruments	September 30, 2015 Carrying Amount Fair Value Fair Value Measurements Using Level 1 Level 2 Level 3 ($ in Thousands) Financial assets: Cash and due from banks $ 303,701 $ 303,701 $ 303,701 $ — $ — Interest-bearing deposits in other financial institutions 70,023 70,023 70,023 — — Federal funds sold and securities purchased under agreements to resell 36,490 36,490 36,490 — — Investment securities held to maturity 604,799 613,372 — 613,372 — Investment securities available for sale 5,403,656 5,403,656 4,505 5,398,951 200 FHLB and Federal Reserve Bank stocks 160,871 160,871 — 160,871 — Loans held for sale 105,144 106,276 — 106,276 — Loans, net 18,262,237 18,435,809 — — 18,435,809 Bank owned life insurance 580,289 580,289 — 580,289 — Accrued interest receivable 70,977 70,977 70,977 — — Interest rate-related instruments 42,593 42,593 — 42,593 — Foreign currency exchange forwards 1,159 1,159 — 1,159 — Interest rate lock commitments to originate residential mortgage loans held for sale 2,584 2,584 — — 2,584 Purchased options (time deposit) 2,915 2,915 — 2,915 — Financial liabilities: Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits $ 18,936,600 $ 18,936,600 $ — $ — $ 18,936,600 Brokered CDs and other time deposits 1,621,795 1,632,811 — 1,632,811 — Short-term funding 1,022,335 1,022,335 — 1,022,335 — Long-term funding 2,679,542 2,740,335 — 2,740,335 — Accrued interest payable 6,888 6,888 6,888 — — Interest rate-related instruments 44,857 44,857 — 44,857 — Foreign currency exchange forwards 960 960 — 960 — Forward commitments to sell residential mortgage loans 1,982 1,982 — — 1,982 Standby letters of credit (1) 3,164 3,164 — 3,164 — Written options (time deposit) 2,915 2,915 — 2,915 — December 31, 2014 Carrying Amount Fair Value Fair Value Measurements Using Level 1 Level 2 Level 3 ($ in Thousands) Financial assets: Cash and due from banks $ 444,113 $ 444,113 $ 444,113 $ — $ — Interest-bearing deposits in other financial institutions 571,924 571,924 571,924 — — Federal funds sold and securities purchased under agreements to resell 16,030 16,030 16,030 — — Investment securities held to maturity 404,455 413,067 — 413,067 — Investment securities available for sale 5,396,812 5,396,812 3,957 5,392,655 200 FHLB and Federal Reserve Bank stocks 189,107 189,107 — 189,107 — Loans held for sale 154,935 156,423 — 156,423 — Loans, net 17,327,544 17,427,647 — — 17,427,647 Bank owned life insurance 574,154 574,154 — 574,154 — Accrued interest receivable 67,573 67,573 67,573 — — Interest rate-related instruments 33,023 33,023 — 33,023 — Foreign currency exchange forwards 2,140 2,140 — 2,140 — Interest rate lock commitments to originate residential mortgage loans held for sale 1,947 1,947 — — 1,947 Purchased options (time deposit) 6,054 6,054 — 6,054 — Financial liabilities: Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits $ 17,192,049 $ 17,192,049 $ — $ — $ 17,192,049 Brokered CDs and other time deposits 1,571,455 1,571,455 — 1,571,455 — Short-term funding 1,068,288 1,068,288 — 1,068,288 — Long-term funding 3,930,117 3,975,605 — 3,975,605 — Accrued interest payable 9,530 9,530 9,530 — — Interest rate-related instruments 35,372 35,372 — 35,372 — Foreign currency exchange forwards 1,957 1,957 — 1,957 — Standby letters of credit (1) 3,542 3,542 — 3,542 — Forward commitments to sell residential mortgage loans 2,435 2,435 — — 2,435 Written options (time deposit) 6,054 6,054 — 6,054 — (1) The commitment on standby letters of credit was $317 million and $353 million at September 30, 2015 and December 31, 2014 , respectively. See Note 13 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets and Liabilities Measured on Recurring Basis at Fair Value	Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Measurements Using September 30, 2015 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Investment securities available for sale: U.S. Treasury securities $ 1,002 $ 1,002 $ — $ — Municipal securities 427,701 — 427,701 — Residential mortgage-related securities: Government-sponsored enterprise (GSE) 3,088,923 — 3,088,923 — Private-label 1,746 — 1,746 — GSE commercial mortgage-related securities 1,877,581 — 1,877,581 — Other securities (debt and equity) 6,703 3,503 3,000 200 Total investment securities available for sale $ 5,403,656 $ 4,505 $ 5,398,951 $ 200 Derivatives (trading and other assets) $ 49,251 $ — $ 46,667 $ 2,584 Liabilities: Derivatives (trading and other liabilities) $ 50,714 $ — $ 48,732 $ 1,982 Fair Value Measurements Using December 31, 2014 Level 1 Level 2 Level 3 ($ in Thousands) Assets: Investment securities available for sale: U.S. Treasury securities $ 998 $ 998 $ — $ — Municipal securities 582,679 — 582,679 — Residential mortgage-related securities: GSE 3,730,789 — 3,730,789 — Private-label 2,294 — 2,294 — GSE commercial mortgage-related securities 1,073,893 — 1,073,893 — Other securities (debt and equity) 6,159 2,959 3,000 200 Total investment securities available for sale $ 5,396,812 $ 3,957 $ 5,392,655 $ 200 Derivatives (trading and other assets) $ 43,164 $ — $ 41,217 $ 1,947 Liabilities: Derivatives (trading and other liabilities) $ 45,818 $ — $ 43,383 $ 2,435

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Net period benefit cost for the pension and postretirement plans	Three Months Ended September 30, Nine Months Ended September 30, Year Ended December 31, 2015 2014 2015 2014 2014 ($ in Thousands) Components of Net Periodic Benefit Cost Pension Plan: Service cost $ 2,318 $ 2,975 $ 8,443 8,925 $ 11,058 Interest cost 1,678 1,790 4,963 5,370 7,132 Expected return on plan assets (5,379 ) (4,855 ) (16,079 ) (14,565 ) (19,922 ) Amortization of prior service cost 12 15 37 45 58 Amortization of actuarial loss 627 326 1,692 975 1,384 Total net periodic benefit cost $ (744 ) $ 251 $ (944 ) $ 750 $ (290 ) Postretirement Plan: Interest cost $ 35 $ 39 $ 105 116 $ 150 Amortization of actuarial gain — (9 ) — (26 ) (35 ) Total net periodic benefit cost $ 35 $ 30 $ 105 $ 90 $ 115

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Selected segment information	Segment Income Statement Data ($ in Thousands) Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Nine Months Ended September 30, 2015 Net interest income $ 230,130 $ 261,951 $ 12,729 $ 504,810 Noninterest income 36,222 200,042 10,249 246,513 Total revenue 266,352 461,993 22,978 751,323 Credit provision * 30,312 19,625 (32,437 ) 17,500 Noninterest expense 106,643 366,410 49,454 522,507 Income before income taxes 129,397 75,958 5,961 211,316 Income tax expense (benefit) 44,384 26,585 (5,163 ) 65,806 Net income $ 85,013 $ 49,373 $ 11,124 $ 145,510 Return on average allocated capital (ROCET1) ** 11.8 % 10.3 % 3.9 % 10.3 % Nine Months Ended September 30, 2014 Net interest income $ 220,973 $ 227,409 $ 57,924 $ 506,306 Noninterest income 35,971 168,287 16,418 220,676 Total revenue 256,944 395,696 74,342 726,982 Credit provision * 37,021 16,534 (42,555 ) 11,000 Noninterest expense 110,558 346,084 50,794 507,436 Income before income taxes 109,365 33,078 66,103 208,546 Income tax expense 35,767 11,388 19,620 66,775 Net income $ 73,598 $ 21,690 $ 46,483 $ 141,771 Return on average allocated capital (ROCET1) ** 12.8 % 5.4 % 9.8 % 9.8 % Segment Balance Sheet Data ($ in Thousands) Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Average Balances for YTD 3Q 2015 Average earning assets $ 9,373,312 $ 8,719,078 $ 6,326,258 $ 24,418,648 Average loans 9,363,936 8,719,078 71,378 18,154,392 Average deposits 5,730,918 10,786,342 3,145,612 19,662,872 Average allocated capital (CET1) ** $ 966,746 $ 640,116 $ 213,750 $ 1,820,612 Average Balances for YTD 3Q 2014 Average earning assets $ 8,933,616 $ 7,646,487 $ 5,933,220 $ 22,513,323 Average loans 8,922,631 7,646,487 85,115 16,654,233 Average deposits 5,129,046 9,872,624 2,347,059 17,348,729 Average allocated capital (CET1) ** $ 766,391 $ 535,528 $ 585,493 $ 1,887,412 Segment Income Statement Data Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Three Months Ended September 30, 2015 Net interest income $ 78,283 $ 88,209 $ 4,017 $ 170,509 Noninterest income 11,305 64,911 3,700 79,916 Total revenue 89,588 153,120 7,717 250,425 Credit provision * 10,851 5,963 (8,814 ) 8,000 Noninterest expense 37,293 122,393 11,750 171,436 Income before income taxes 41,444 24,764 4,781 70,989 Income tax expense (benefit) 13,955 8,667 (1,071 ) 21,551 Net income $ 27,489 $ 16,097 $ 5,852 $ 49,438 Return on average allocated capital (ROCET1) ** 11.0 % 10.1 % 6.7 % 10.2 % Three Months Ended September 30, 2014 Net interest income $ 72,474 $ 82,067 $ 18,089 $ 172,630 Noninterest income 11,888 54,601 8,419 74,908 Total revenue 84,362 136,668 26,508 247,538 Credit provision * 11,074 6,773 (16,847 ) 1,000 Noninterest expense 35,044 122,722 14,087 171,853 Income before income taxes 38,244 7,173 29,268 74,685 Income tax expense 12,343 2,467 9,668 24,478 Net income $ 25,901 $ 4,706 $ 19,600 $ 50,207 Return on average allocated capital (ROCET1) ** 13.8 % 3.2 % 13.4 % 10.4 % Segment Balance Sheet Data Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Average Balances for 3Q15 Average earning assets $ 9,475,469 $ 8,917,831 $ 6,440,714 $ 24,834,014 Average loans 9,466,761 8,917,831 68,157 18,452,749 Average deposits 6,044,306 10,969,172 3,280,121 20,293,599 Average allocated capital (CET1) ** $ 988,283 $ 632,878 $ 216,275 $ 1,837,436 Average Balances for 3Q14 Average earning assets $ 8,761,870 $ 8,310,839 $ 6,024,008 $ 23,096,717 Average loans 8,750,207 8,310,839 79,915 17,140,961 Average deposits 5,092,314 10,337,637 2,443,427 17,873,378 Average allocated capital (CET1) ** $ 744,792 $ 583,096 $ 543,358 $ 1,871,246 * The consolidated credit provision is equal to the actual reported provision for credit losses. ** The Federal Reserve establishes capital adequacy requirements for the Corporation, including Tier 1 capital. Tier 1 capital is comprised of common capital and certain redeemable, non-cumulative preferred stock. Average allocated capital represents average common equity Tier 1 which is defined as average Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities. This is a non-GAAP financial measure. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1 ("CET1"). The ROCET1 for the Risk Management and Shared Services segment and the Consolidated Total is inclusive of the annualized effect of the preferred stock dividends.

Accumulated Other Comprehensi39

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Summary of activity in accumulated other comprehensive income (loss)	($ in Thousands) Investments Securities Available For Sale Defined Benefit Pension and Postretirement Obligations Accumulated Other Comprehensive Income (Loss) Balance January 1, 2015 $ 18,512 $ (23,362 ) $ (4,850 ) Other comprehensive income before reclassifications 35,101 — 35,101 Amounts reclassified from accumulated other comprehensive income (loss) (4,038 ) 1,729 (2,309 ) Income tax expense (11,907 ) (659 ) (12,566 ) Net other comprehensive income during period 19,156 1,070 20,226 Balance September 30, 2015 $ 37,668 $ (22,292 ) $ 15,376 Balance January 1, 2014 $ (11,396 ) $ (12,848 ) $ (24,244 ) Other comprehensive income before reclassifications 36,061 — 36,061 Amounts reclassified from accumulated other comprehensive income (loss) (469 ) 994 525 Income tax expense (13,684 ) (383 ) (14,067 ) Net other comprehensive income during period 21,908 611 22,519 Balance September 30, 2014 $ 10,512 $ (12,237 ) $ (1,725 ) ($ in Thousands) Investments Securities Available For Sale Defined Benefit Pension and Postretirement Obligations Accumulated Other Comprehensive Income (Loss) Balance July 1, 2015 $ 25,282 $ (22,688 ) $ 2,594 Other comprehensive income before reclassifications 22,907 — 22,907 Amounts reclassified from accumulated other comprehensive income (loss) (2,796 ) 639 (2,157 ) Income tax expense (7,725 ) (243 ) (7,968 ) Net other comprehensive income during period 12,386 396 12,782 Balance September 30, 2015 $ 37,668 $ (22,292 ) $ 15,376 Balance July 1, 2014 $ 22,935 $ (12,441 ) $ 10,494 Other comprehensive loss before reclassifications (20,123 ) — (20,123 ) Amounts reclassified from accumulated other comprehensive income (loss) (57 ) 332 275 Income tax (expense) benefit 7,757 (128 ) 7,629 Net other comprehensive income (loss) during period (12,423 ) 204 (12,219 ) Balance September 30, 2014 $ 10,512 $ (12,237 ) $ (1,725 )

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reclassified Loans	$ 500,000
Home equity	1,014,465	$ 1,051,927
Balance Prior to Reclassification, Consumer, Home Equity		1,600,000
Residential mortgage	$ 5,682,178	5,056,891
Balance Prior to Reclassification, Consumer, Mortgage		$ 4,500,000

Acquisition (Details)

Acquisition (Details) - USD ($) $ in Thousands	Feb. 17, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Cash and stock consideration		$ 43,530	$ 0
Ahmann & Martin Co. [Member]
Business Acquisition [Line Items]
Cash and stock consideration	$ 48,000
Maximum contingent consideration	$ 8,000
Goodwill acquired		40,000
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Other intangible assets, additions during the period		12,115		$ 0
Ahmann & Martin Co. [Member]
Business Acquisition [Line Items]
Other intangible assets, additions during the period		$ 12,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Calculations for basic and diluted earnings per common share
Net income	$ 49,438	$ 50,207	$ 145,510	$ 141,771
Preferred stock dividends	(2,184)	(1,255)	(4,957)	(3,777)
Net income available to common equity	47,254	48,952	140,553	137,994
Common shareholder dividends	(14,927)	(13,983)	(45,149)	(42,864)
Dividends on unvested share-based payment awards	(164)	(140)	(450)	(435)
Undistributed earnings	32,163	34,829	94,954	94,695
Undistributed earnings allocated to common shareholders	31,813	34,481	93,961	93,862
Undistributed earnings allocated to unvested share-based payment awards	350	348	993	833
Undistributed earnings	32,163	34,829	94,954	94,695
Basic
Distributed earnings to common shareholders	14,927	13,983	45,149	42,864
Undistributed earnings allocated to common shareholders	31,813	34,481	93,961	93,862
Total common shareholders earnings, basic	46,740	48,464	139,110	136,726
Diluted
Distributed earnings to common shareholders	14,927	13,983	45,149	42,864
Undistributed earnings allocated to common shareholders	31,813	34,481	93,961	93,862
Total common shareholders earnings, diluted	$ 46,740	$ 48,464	$ 139,110	$ 136,726
Weighted average common shares outstanding (in shares)	148,614	155,925	149,524	159,090
Effect of dilutive common stock awards (in shares)	1,185	1,066	1,180	903
Diluted weighted average common shares outstanding (in shares)	149,799	156,991	150,704	159,993
Basic earnings per common share (in usd per share)	$ 0.31	$ 0.31	$ 0.93	$ 0.86
Diluted earnings per common share (in usd per share)	$ 0.31	$ 0.31	$ 0.92	$ 0.85
Earnings Per Share (Textuals) [Abstract]
Number of antidilutive stock options excluded from the computation of diluted earnings per share	1,000	2,000	1,000	3,000

Stock-Based Compensation Stock

Stock-Based Compensation Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair value assumptions of stock options
Dividend yield	2.00%	2.00%
Risk-free interest rate	2.00%	2.00%
Weighted average expected volatility	20.00%	20.00%
Weighted average expected life	6 years	6 years
Weighted average per share fair value of options	$ 3.08	$ 3
Shares
Stock Options Shares Outstanding, Beginning balance	7,847,338	8,034,243
Granted	1,348,504	1,389,452
Exercised	(1,019,935)	(933,143)
Forfeited or expired	(771,382)	(643,214)
Stock Options Shares Outstanding, Ending balance	7,404,525	7,847,338
Options exercisable, shares	4,957,789	5,076,676
Weighted Average Exercise Price
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 18.34	$ 18.37
Granted	17.95	17.45
Exercised	13.85	13.77
Forfeited or expired	27.19	23.50
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance	17.97	18.34
Options Exercisable, Weighted Average Exercise Price	$ 18.38	$ 19.96
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 18 days	5 years 9 months 15 days
Options exercisable, Weighted Average Remaining Contractual Term	4 years 8 months 23 days	4 years 4 months 28 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 15,962	$ 23,986
Options exercisable, Aggregate Intrinsic Value	$ 13,589	$ 14,953

Stock Based Compensation Nonves

Stock Based Compensation Nonvested Stock Option Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Granted	1,348,504	1,389,452
Nonvested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Stock Option Shares Outstanding, Beginning Balance	2,770,662	3,110,523
Granted	1,348,504	1,389,452
Vested	(1,451,871)	(1,522,152)
Forfeited	(220,559)	(207,161)
Stock Option Shares Outstanding, Ending Balance	2,446,736	2,770,662
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested Weighted Average Grant Date Fair Value, Beginning balance	$ 3.74	$ 4.69
Granted	3.08	3
Vested	4.20	4.92
Forfeited	3.28	4.38
Nonvested Weighted Average Grant Date Fair Value, Ending balance	$ 3.15	$ 3.74

Stock Based Compensation Restri

Stock Based Compensation Restricted Stock Activity (Details) - Restricted Stock Award [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Shares
Outstanding Shares, Beginning balance	1,982,126	1,511,765
Granted	1,165,087	1,177,168
Vested	(694,711)	(538,877)
Forfeited	(171,293)	(167,930)
Outstanding Shares, Ending balance	2,281,209	1,982,126
Weighted Average Grant Date Fair Value
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance	$ 15.79	$ 13.92
Granted	18.05	17.35
Vested	15.59	14.12
Forfeited	16.80	15.26
Outstanding Weighted Average Grant Date Fair Value, Ending balance	$ 17.01	$ 15.79

Stock Based Compensation (Detai

Stock Based Compensation (Details Textuals) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised	$ 5,000,000		$ 4,000,000
Total fair value of vested stock options	6,000,000		7,000,000
Recognized compensation expense for vesting of stock options	3,000,000	$ 5,000,000	6,000,000
Recognized compensation expense for accelerated vesting of stock options	690,000
Unvested share-based payment awards	5,000,000
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	12,000,000	$ 8,000,000	$ 10,000,000
Recognized compensation expense for accelerated vesting of stock options	2,000,000
Unvested share-based payment awards	$ 26,000,000

Investment Securities AFS and H

Investment Securities AFS and HTM Securities Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment securities available for sale:
Amortized cost	$ 5,344,040	$ 5,368,259
Gross unrealized gains	81,042	85,085
Gross unrealized losses	(21,426)	(56,532)
Fair value	5,403,656	5,396,812
Investment securities held to maturity:
Amortized cost	604,799	404,455
Gross unrealized gains	10,023	9,444
Gross unrealized losses	(1,450)	(832)
Fair value	613,372	413,067
US Treasury Securities [Member]
Investment securities available for sale:
Amortized cost	999	999
Gross unrealized gains	3	0
Gross unrealized losses	0	(1)
Fair value	1,002	998
Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Amortized cost	409,529	560,839
Gross unrealized gains	18,176	21,869
Gross unrealized losses	(4)	(29)
Fair value	427,701	582,679
Investment securities held to maturity:
Amortized cost	604,799	404,455
Gross unrealized gains	10,023	9,444
Gross unrealized losses	(1,450)	(832)
Fair value	613,372	413,067
Federal National Mortgage Association Certificates and Obligations (FNMA) and Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Investment securities available for sale:
Amortized cost	1,932,740	3,534,240
Gross unrealized gains	52,232	59,640
Gross unrealized losses	(4,182)	(30,423)
Fair value	1,980,790	3,563,457
Government National Mortgage Association (GNMA) [Member]
Investment securities available for sale:
Amortized cost	1,106,601	165,863
Gross unrealized gains	4,106	1,596
Gross unrealized losses	(2,574)	(127)
Fair value	1,108,133	167,332
Private Label [Member]
Investment securities available for sale:
Amortized cost	1,755	2,297
Gross unrealized gains	1	7
Gross unrealized losses	(10)	(10)
Fair value	1,746	2,294
GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Amortized cost	1,885,776	1,097,913
Gross unrealized gains	6,461	1,922
Gross unrealized losses	(14,656)	(25,942)
Fair value	1,877,581	1,073,893
Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Amortized cost	6,640	6,108
Gross unrealized gains	63	51
Gross unrealized losses	0	0
Fair value	$ 6,703	$ 6,159

Investment Securities AFS and48

Investment Securities AFS and HTM Contractual Maturity Table (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amortized Cost
Available for Sale, Due in one year or less	$ 39,763
Available for Sale, Due after one year through five years	236,730
Available for Sale, Due after five years through ten years	140,072
Available for Sale, Due after ten years	585
Available for Sale, Total debt securities	417,150
Fair Value
Available for Sale, Due in one year or less	40,025
Available for Sale, Due after one year through five years	248,772
Available for Sale, Due after five years through ten years	145,956
Available for Sale, Due after ten years	599
Available for Sale, Total debt securities	435,352
Investment securities available for sale, amortized cost	5,344,040	$ 5,368,259
Investment securities available for sale, at fair value	$ 5,403,656	5,396,812
Ratio of Fair Value to Amortized Cost	101.10%
Amortized Cost
Held to Maturity, Due in one year or less	$ 0
Held to Maturity, Due after one year through five years	3,980
Held to Maturity, Due after five years through ten years	133,801
Held to Maturity, Due after ten years	467,018
Amortized cost	604,799	404,455
Fair Value
Held to Maturity, Due in one year or less	0
Held to Maturity, Due after one year through five years	4,042
Held to Maturity, Due after five years through ten years	136,164
Held to Maturity, Due after ten years	473,166
Held to Maturity, Total debt securities	$ 613,372	413,067
Ratio of Fair Value to Amortized Cost	101.40%
Federal National Mortgage Association Certificates and Obligations (FNMA) and Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Fair Value
Investment securities available for sale, amortized cost	$ 1,932,740	3,534,240
Investment securities available for sale, at fair value	1,980,790	3,563,457
Government National Mortgage Association (GNMA) [Member]
Fair Value
Investment securities available for sale, amortized cost	1,106,601	165,863
Investment securities available for sale, at fair value	1,108,133	167,332
Private Label [Member]
Fair Value
Investment securities available for sale, amortized cost	1,755	2,297
Investment securities available for sale, at fair value	1,746	2,294
GSE commercial mortgage-related securities [Member]
Fair Value
Investment securities available for sale, amortized cost	1,885,776	1,097,913
Investment securities available for sale, at fair value	1,877,581	$ 1,073,893
Equity Securities [Member]
Fair Value
Investment securities available for sale, amortized cost	18
Investment securities available for sale, at fair value	$ 54

Investment Securities AFS and49

Investment Securities AFS and HTM Gross Unrealized Losses (Details) $ in Thousands	Sep. 30, 2015USD ($)security	Dec. 31, 2014USD ($)security
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (4,307)	$ (3,189)
Unrealized losses on available for sale securities, 12 months or more	(17,119)	(53,343)
Total unrealized losses on available for sale securities	(21,426)	(56,532)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,382,462	669,839
Fair value of unrealized losses on available for sale securities, 12 months or more	821,594	1,719,118
Total fair value of unrealized losses on available for sale securities	2,204,056	2,388,957
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	(1,180)	(216)
Unrealized losses on held to maturity securities, 12 months or more	(270)	(616)
Total unrealized losses on held to maturity securities	(1,450)	(832)
Fair value of unrealized losses on held to maturity securities, less than 12 months	112,223	31,924
Fair value of unrealized losses on held to maturity securities, 12 months or more	9,405	38,915
Total fair value of unrealized losses on held to maturity securities	121,628	70,839
US Treasury Securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months		(1)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(1)
Fair value of unrealized losses on available for sale securities, less than 12 months		998
Fair value of unrealized losses on available for sale securities, 12 months or more		0
Total fair value of unrealized losses on available for sale securities		$ 998
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security		1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security		0
Obligations of state and political subdivisions (municipal securities) [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	(2)	$ (9)
Unrealized losses on available for sale securities, 12 months or more	(2)	(20)
Total unrealized losses on available for sale securities	(4)	(29)
Fair value of unrealized losses on available for sale securities, less than 12 months	628	3,374
Fair value of unrealized losses on available for sale securities, 12 months or more	186	2,133
Total fair value of unrealized losses on available for sale securities	$ 814	$ 5,507
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	2	6
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	1	6
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (1,180)	$ (216)
Unrealized losses on held to maturity securities, 12 months or more	(270)	(616)
Total unrealized losses on held to maturity securities	(1,450)	(832)
Fair value of unrealized losses on held to maturity securities, less than 12 months	112,223	31,924
Fair value of unrealized losses on held to maturity securities, 12 months or more	9,405	38,915
Total fair value of unrealized losses on held to maturity securities	$ 121,628	$ 70,839
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	244	74
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	20	85
Government National Mortgage Association (GNMA) [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (2,894)	$ (1,404)
Unrealized losses on available for sale securities, 12 months or more	(3,862)	(29,146)
Total unrealized losses on available for sale securities	(6,756)	(30,550)
Fair value of unrealized losses on available for sale securities, less than 12 months	854,924	333,713
Fair value of unrealized losses on available for sale securities, 12 months or more	374,787	1,256,533
Total fair value of unrealized losses on available for sale securities	$ 1,229,711	$ 1,590,246
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	51	16
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	20	56
Private Label [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (9)
Unrealized losses on available for sale securities, 12 months or more	(10)	(1)
Total unrealized losses on available for sale securities	(10)	(10)
Fair value of unrealized losses on available for sale securities, less than 12 months	90	1,772
Fair value of unrealized losses on available for sale securities, 12 months or more	1,591	27
Total fair value of unrealized losses on available for sale securities	$ 1,681	$ 1,799
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	1	1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	3	2
GSE commercial mortgage-related securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (1,411)	$ (1,766)
Unrealized losses on available for sale securities, 12 months or more	(13,245)	(24,176)
Total unrealized losses on available for sale securities	(14,656)	(25,942)
Fair value of unrealized losses on available for sale securities, less than 12 months	526,820	329,982
Fair value of unrealized losses on available for sale securities, 12 months or more	445,030	460,425
Total fair value of unrealized losses on available for sale securities	$ 971,850	$ 790,407
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	15	9
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	20	20

Investment Securities Investmen

Investment Securities Investment Securities Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Gross gains				$ 8,047	$ 1,159	$ 1,184
Gross losses				(4,009)	(690)	(690)
Investment securities gains, net	$ 2,796	$ 57		4,038	469	494
Proceeds from sales of investment securities			$ 1,000,000	1,066,957	$ 101,987	$ 102,011
Proceeds including Receivable from Sale of Available-for-sale Securities				$ 1,206,242

Investment Securities (Details

Investment Securities (Details Textuals) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of investment securities				$ 1,000,000	$ 1,066,957	$ 101,987	$ 102,011
Federal Home Loan Bank Stock	$ 88,000			88,000	88,000		118,000
Federal Reserve Bank Stock	73,000			73,000	73,000		71,000
Investment securities gains, net	2,796		$ 57		4,038	469	494
Proceeds from the sale of FHLB stock		$ 43,000			42,514	0
Payments to Acquire Federal Home Loan Bank Stock		$ 14,000			14,279	$ 7,626
Proceeds including Receivable from Sale of Available-for-sale Securities					1,206,242
Unsettled trades to sell securities	$ 139,286			$ 139,286	$ 139,286		$ 0

Loans, Allowance for Credit L52

Loans, Allowance for Credit Losses, and Credit Quality Loan Composition (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Loan composition
Commercial and industrial	$ 6,085,473	$ 5,905,902
Commercial real estate - owner occupied	966,689	1,007,937
Lease financing	42,607	51,529
Commercial and business lending	7,094,769	6,965,368
Commercial real estate - investor	3,183,352	3,056,485
Real estate construction	1,124,280	1,008,956
Commercial real estate lending	4,307,632	4,065,441
Total commercial	11,402,401	11,030,809
Home equity	1,014,465	1,051,927
Installment and credit cards	425,729	454,219
Residential mortgage	5,682,178	5,056,891
Total consumer	7,122,372	6,563,037
Total loans	$ 18,524,773	$ 17,593,846

Loans, Allowance for Credit L53

Loans, Allowance for Credit Losses, and Credit Quality Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Changes in the allowance for loan losses
Loans and Leases Receivable, Allowance, Beginning Balance	$ 266,302	$ 268,315
Provision for loan losses	18,500	13,000
Charge offs	(39,539)	(44,096)
Recoveries	17,273	29,083
Net charge offs	(22,266)	(15,013)
Loans and Leases Receivable, Allowance, Ending Balance	262,536	266,302
Changes in the allowance for unfunded commitments
Allowance for Credit Losses	286,436	291,202
Reserve for Off-balance Sheet Activities [Member]
Changes in the allowance for unfunded commitments
Balance at beginning of period	24,900	21,900
Provision for unfunded commitments	(1,000)	3,000
Balance at end of period	$ 23,900	$ 24,900

Loans, Allowance for Credit L54

Loans, Allowance for Credit Losses, and Credit Quality Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2015	Dec. 31, 2014
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	$ 266,302	$ 268,315
Provision for loan losses	18,500	13,000
Charge offs	(39,539)	(44,096)
Recoveries	17,273	29,083
Loans and Leases Receivable, Allowance, Ending Balance	262,536	266,302
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			$ 6,293	$ 17,866
Ending balance impaired loans collectively evaluated for impairment			25,420	32,565
Total impaired loans			31,713	50,431
Ending balance all other loans collectively evaluated for impairment			230,823	215,871
Total	266,302	268,315	262,536	266,302
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			78,954	101,822
Ending balance impaired loans collectively evaluated for impairment			151,309	173,807
Total impaired loans			230,263	275,629
Ending balance all other loans collectively evaluated for impairment			18,294,510	17,318,217
Total loans			18,524,773	17,593,846
Commercial and Industrial [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	116,025	104,501
Provision for loan losses	15,749	14,767
Charge offs	(19,672)	(14,633)
Recoveries	6,392	11,390
Loans and Leases Receivable, Allowance, Ending Balance	118,494	116,025
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			5,922	13,615
Ending balance impaired loans collectively evaluated for impairment			977	2,852
Total impaired loans			6,899	16,467
Ending balance all other loans collectively evaluated for impairment			111,595	99,558
Total	116,025	104,501	118,494	116,025
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			55,148	45,118
Ending balance impaired loans collectively evaluated for impairment			31,871	38,437
Total impaired loans			87,019	83,555
Ending balance all other loans collectively evaluated for impairment			5,998,454	5,822,347
Total loans			6,085,473	5,905,902
Commercial Real Estate Owner Occupied [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	16,510	19,476
Provision for loan losses	7,245	(1,296)
Charge offs	(2,325)	(3,476)
Recoveries	892	1,806
Loans and Leases Receivable, Allowance, Ending Balance	22,322	16,510
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			0	1,490
Ending balance impaired loans collectively evaluated for impairment			571	1,731
Total impaired loans			571	3,221
Ending balance all other loans collectively evaluated for impairment			21,751	13,289
Total	16,510	19,476	22,322	16,510
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			11,174	20,731
Ending balance impaired loans collectively evaluated for impairment			9,537	15,548
Total impaired loans			20,711	36,279
Ending balance all other loans collectively evaluated for impairment			945,978	971,658
Total loans			966,689	1,007,937
Lease Financing [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	1,610	1,607
Provision for loan losses	(835)	35
Charge offs	0	(39)
Recoveries	0	7
Loans and Leases Receivable, Allowance, Ending Balance	775	1,610
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			0	574
Ending balance impaired loans collectively evaluated for impairment			0	0
Total impaired loans			0	574
Ending balance all other loans collectively evaluated for impairment			775	1,036
Total	1,610	1,607	775	1,610
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			1,763	1,801
Ending balance impaired loans collectively evaluated for impairment			0	0
Total impaired loans			1,763	1,801
Ending balance all other loans collectively evaluated for impairment			40,844	49,728
Total loans			42,607	51,529
Commercial Real Estate Investor [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	46,333	58,156
Provision for loan losses	(2,703)	(17,290)
Charge offs	(3,947)	(4,529)
Recoveries	4,124	9,996
Loans and Leases Receivable, Allowance, Ending Balance	43,807	46,333
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			197	1,649
Ending balance impaired loans collectively evaluated for impairment			1,152	1,938
Total impaired loans			1,349	3,587
Ending balance all other loans collectively evaluated for impairment			42,458	42,746
Total	46,333	58,156	43,807	46,333
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			3,822	19,683
Ending balance impaired loans collectively evaluated for impairment			21,679	26,129
Total impaired loans			25,501	45,812
Ending balance all other loans collectively evaluated for impairment			3,157,851	3,010,673
Total loans			3,183,352	3,056,485
Real Estate Construction Port Folio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	20,999	23,418
Provision for loan losses	(1,314)	(1,277)
Charge offs	(546)	(1,958)
Recoveries	1,924	816
Loans and Leases Receivable, Allowance, Ending Balance	21,063	20,999
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			0	328
Ending balance impaired loans collectively evaluated for impairment			474	767
Total impaired loans			474	1,095
Ending balance all other loans collectively evaluated for impairment			20,589	19,904
Total	20,999	23,418	21,063	20,999
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			0	3,776
Ending balance impaired loans collectively evaluated for impairment			1,482	2,350
Total impaired loans			1,482	6,126
Ending balance all other loans collectively evaluated for impairment			1,122,798	1,002,830
Total loans			1,124,280	1,008,956
Home Equity Portfolio [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	26,464	27,932
Provision for loan losses	(987)	6,278
Charge offs	(5,466)	(10,946)
Recoveries	2,568	3,200
Loans and Leases Receivable, Allowance, Ending Balance	22,579	26,464
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			3	11
Ending balance impaired loans collectively evaluated for impairment			9,652	11,371
Total impaired loans			9,655	11,382
Ending balance all other loans collectively evaluated for impairment			12,924	15,082
Total	26,464	27,932	22,579	26,464
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			170	962
Ending balance impaired loans collectively evaluated for impairment			20,416	23,698
Total impaired loans			20,586	24,660
Ending balance all other loans collectively evaluated for impairment			993,879	1,027,267
Total loans			1,014,465	1,051,927
Installment and Credit Cards Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	6,435	2,416
Provision for loan losses	1,284	6,279
Charge offs	(2,934)	(2,876)
Recoveries	569	616
Loans and Leases Receivable, Allowance, Ending Balance	5,354	6,435
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			0	0
Ending balance impaired loans collectively evaluated for impairment			210	308
Total impaired loans			210	308
Ending balance all other loans collectively evaluated for impairment			5,144	6,127
Total	6,435	2,416	5,354	6,435
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			0	0
Ending balance impaired loans collectively evaluated for impairment			1,190	1,587
Total impaired loans			1,190	1,587
Ending balance all other loans collectively evaluated for impairment			424,539	452,632
Total loans			425,729	454,219
Residential Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	31,926	30,809
Provision for loan losses	61	5,504
Charge offs	(4,649)	(5,639)
Recoveries	804	1,252
Loans and Leases Receivable, Allowance, Ending Balance	28,142	31,926
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment			171	199
Ending balance impaired loans collectively evaluated for impairment			12,384	13,598
Total impaired loans			12,555	13,797
Ending balance all other loans collectively evaluated for impairment			15,587	18,129
Total	$ 31,926	$ 30,809	28,142	31,926
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment			6,877	9,751
Ending balance impaired loans collectively evaluated for impairment			65,134	66,058
Total impaired loans			72,011	75,809
Ending balance all other loans collectively evaluated for impairment			5,610,167	4,981,082
Total loans			$ 5,682,178	$ 5,056,891

Loans, Allowance for Credit L55

Loans, Allowance for Credit Losses, and Credit Quality Commercial Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commercial loans by credit quality indicator
Commercial and industrial	$ 6,085,473	$ 5,905,902
Commercial real estate - owner occupied	966,689	1,007,937
Lease financing	42,607	51,529
Commercial and business lending	7,094,769	6,965,368
Commercial real estate - investor	3,183,352	3,056,485
Real estate construction	1,124,280	1,008,956
Commercial real estate lending	4,307,632	4,065,441
Total commercial	11,402,401	11,030,809
Pass [Member]
Commercial loans by credit quality indicator
Commercial and industrial	5,487,926	5,594,497
Commercial real estate - owner occupied	874,566	904,526
Lease financing	39,987	46,931
Commercial and business lending	6,402,479	6,545,954
Commercial real estate - investor	3,089,760	2,974,493
Real estate construction	1,120,173	998,972
Commercial real estate lending	4,209,933	3,973,465
Total commercial	10,612,412	10,519,419
Special Mention [Member]
Commercial loans by credit quality indicator
Commercial and industrial	318,587	119,328
Commercial real estate - owner occupied	29,946	18,437
Lease financing	624	88
Commercial and business lending	349,157	137,853
Commercial real estate - investor	44,458	12,137
Real estate construction	271	2,082
Commercial real estate lending	44,729	14,219
Total commercial	393,886	152,072
Potential Problem [Member]
Commercial loans by credit quality indicator
Commercial and industrial	191,941	108,522
Commercial real estate - owner occupied	41,466	48,695
Lease financing	233	2,709
Commercial and business lending	233,640	159,926
Commercial real estate - investor	23,633	24,043
Real estate construction	2,354	1,776
Commercial real estate lending	25,987	25,819
Total commercial	259,627	185,745
Impaired [Member]
Commercial loans by credit quality indicator
Commercial and industrial	87,019	83,555
Commercial real estate - owner occupied	20,711	36,279
Lease financing	1,763	1,801
Commercial and business lending	109,493	121,635
Commercial real estate - investor	25,501	45,812
Real estate construction	1,482	6,126
Commercial real estate lending	26,983	51,938
Total commercial	$ 136,476	$ 173,573

Loans, Allowance for Credit L56

Loans, Allowance for Credit Losses, and Credit Quality Consumer Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Consumer Loans by credit quality indicator [Abstract]
Home equity	$ 1,014,465	$ 1,051,927
Installment and credit cards	425,729	454,219
Residential mortgage	5,682,178	5,056,891
Total consumer	7,122,372	6,563,037
Performing Financing Receivable [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	985,087	1,017,604
Installment and credit cards	422,816	450,698
Residential mortgage	5,601,390	4,972,455
Total consumer	7,009,293	6,440,757
30 To 89 Days Past Due [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	8,565	8,783
Installment and credit cards	1,723	1,932
Residential mortgage	4,811	4,846
Total consumer	15,099	15,561
Potential Problem [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	227	880
Installment and credit cards	0	2
Residential mortgage	3,966	3,781
Total consumer	4,193	4,663
Impaired [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	20,586	24,660
Installment and credit cards	1,190	1,587
Residential mortgage	72,011	75,809
Total consumer	$ 93,787	$ 102,056

Loans, Allowance for Credit L57

Loans, Allowance for Credit Losses, and Credit Quality Loans by Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summarized details of Loans
Total Past Due	$ 79,561	$ 127,000
Current	18,445,212	17,466,846
Total loans	18,524,773	17,593,846
Accruing loans past due 90 days or more	$ 1,000	$ 2,000
Percent of current nonaccrual loans	62.00%	54.00%
Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	$ 14,216	$ 26,654
Current	6,071,257	5,879,248
Total loans	6,085,473	5,905,902
Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	5,854	22,462
Current	960,835	985,475
Total loans	966,689	1,007,937
Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	513
Current	42,232	51,016
Total loans	42,607	51,529
Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	20,445	49,629
Current	7,074,324	6,915,739
Total loans	7,094,769	6,965,368
Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	4,783	16,289
Current	3,178,569	3,040,196
Total loans	3,183,352	3,056,485
Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	987	1,942
Current	1,123,293	1,007,014
Total loans	1,124,280	1,008,956
Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	5,770	18,231
Current	4,301,862	4,047,210
Total loans	4,307,632	4,065,441
Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	26,215	67,860
Current	11,376,186	10,962,949
Total loans	11,402,401	11,030,809
Home Equity [Member]
Summarized details of Loans
Total Past Due	16,436	18,912
Current	998,029	1,033,015
Total loans	1,014,465	1,051,927
Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	3,263	3,525
Current	422,466	450,694
Total loans	425,729	454,219
Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	33,647	36,703
Current	5,648,531	5,020,188
Total loans	5,682,178	5,056,891
Consumer Loan [Member]
Summarized details of Loans
Total Past Due	53,346	59,140
Current	7,069,026	6,503,897
Total loans	7,122,372	6,563,037
Accruing Loans [Member]
Summarized details of Loans
Total Past Due	23,488	44,751
Current	18,353,831	17,371,682
Total loans	18,377,319	17,416,433
Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	3,099	15,001
Current	6,023,953	5,841,238
Total loans	6,027,052	5,856,239
Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	2,018	10,628
Current	951,303	971,484
Total loans	953,321	982,112
Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	0
Current	40,469	49,728
Total loans	40,844	49,728
Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	5,492	25,629
Current	7,015,725	6,862,450
Total loans	7,021,217	6,888,079
Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	1,218	1,208
Current	3,175,213	3,032,592
Total loans	3,176,431	3,033,800
Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	373	984
Current	1,122,910	1,002,573
Total loans	1,123,283	1,003,557
Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	1,591	2,192
Current	4,298,123	4,035,165
Total loans	4,299,714	4,037,357
Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	7,083	27,821
Current	11,313,848	10,897,615
Total loans	11,320,931	10,925,436
Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	8,565	8,835
Current	992,259	1,026,641
Total loans	1,000,824	1,035,476
Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	3,029	3,249
Current	422,314	450,357
Total loans	425,343	453,606
Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,811	4,846
Current	5,625,410	4,997,069
Total loans	5,630,221	5,001,915
Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	16,405	16,930
Current	7,039,983	6,474,067
Total loans	7,056,388	6,490,997
Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	56,073	82,249
Current	91,381	95,164
Total loans	147,454	177,413
Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	11,117	11,653
Current	47,304	38,010
Total loans	58,421	49,663
Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	3,836	11,834
Current	9,532	13,991
Total loans	13,368	25,825
Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	513
Current	1,763	1,288
Total loans	1,763	1,801
Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	14,953	24,000
Current	58,599	53,289
Total loans	73,552	77,289
Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	3,565	15,081
Current	3,356	7,604
Total loans	6,921	22,685
Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	614	958
Current	383	4,441
Total loans	997	5,399
Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	4,179	16,039
Current	3,739	12,045
Total loans	7,918	28,084
Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	19,132	40,039
Current	62,338	65,334
Total loans	81,470	105,373
Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	7,871	10,077
Current	5,770	6,374
Total loans	13,641	16,451
Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	234	276
Current	152	337
Total loans	386	613
Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	28,836	31,857
Current	23,121	23,119
Total loans	51,957	54,976
Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	36,941	42,210
Current	29,043	29,830
Total loans	65,984	72,040
Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	23,921	39,373
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,160	5,338
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	1,368	11,626
Financing Receivables, 30 to 59 Days Past Due [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	2,903	16,964
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	1,104	2,569
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	373	1,038
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	1,477	3,607
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	4,380	20,571
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	9,312	8,459
Financing Receivables, 30 to 59 Days Past Due [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,209	1,282
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	9,020	9,061
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	19,541	18,802
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member]
Summarized details of Loans
Total Past Due	17,017	26,621
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,133	4,466
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	1,173	8,429
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	2,681	12,895
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	1,104	712
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	312	951
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	1,416	1,663
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	4,097	14,558
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	7,413	6,988
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,162	1,186
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,345	3,889
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	12,920	12,063
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	6,904	12,752
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	27	872
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	195	3,197
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	222	4,069
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	0	1,857
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	61	87
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	61	1,944
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	283	6,013
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	1,899	1,471
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	47	96
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,675	5,172
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	6,621	6,739
Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	11,940	22,705
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	3,167	10,908
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	845	2,240
Financing Receivables, 60 to 89 Days Past Due [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	4,012	13,148
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	114	955
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	169	106
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	283	1,061
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	4,295	14,209
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	2,380	3,561
Financing Receivables, 60 to 89 Days Past Due [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	584	785
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,681	4,150
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	7,645	8,496
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member]
Summarized details of Loans
Total Past Due	4,987	16,507
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,788	10,281
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	845	2,199
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	2,633	12,480
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	114	496
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	61	33
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	175	529
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	2,808	13,009
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	1,152	1,795
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	561	746
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	466	957
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	2,179	3,498
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	6,953	6,198
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,379	627
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	0	41
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	1,379	668
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	0	459
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	108	73
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	108	532
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,487	1,200
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	1,228	1,766
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	23	39
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,215	3,193
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	5,466	4,998
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	43,700	64,922
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	9,889	10,408
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	3,641	8,596
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	513
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	13,530	19,517
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	3,565	12,765
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	445	798
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	4,010	13,563
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	17,540	33,080
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	4,744	6,892
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,470	1,458
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	19,946	23,492
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	26,160	31,842
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member]
Summarized details of Loans
Total Past Due	1,484	1,623
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	178	254
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	178	254
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	178	254
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	0	52
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,306	1,317
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	1,306	1,369
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	42,216	63,299
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	9,711	10,154
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	3,641	8,596
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	513
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	13,352	19,263
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	3,565	12,765
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	445	798
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	4,010	13,563
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	17,362	32,826
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	4,744	6,840
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	164	141
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	19,946	23,492
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	$ 24,854	$ 30,473

Loans, Allowance for Credit L58

Loans, Allowance for Credit Losses, and Credit Quality Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 230,263	$ 275,629
Unpaid Principal Balance	243,368	310,811
Related Allowance	31,713	50,431
YTD Average Recorded Investment	238,836	290,370
YTD Interest Income Recognized	5,421	9,384
Interest income recognized on accruing restructured loans	$ 3,000	$ 5,000
Fair Value Mark	82.00%	72.00%
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 182,839	$ 232,166
Unpaid Principal Balance	194,180	253,186
Related Allowance	31,713	50,431
YTD Average Recorded Investment	186,058	242,219
YTD Interest Income Recognized	4,692	8,797
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	47,424	43,463
Unpaid Principal Balance	49,188	57,625
Related Allowance	0	0
YTD Average Recorded Investment	52,778	48,151
YTD Interest Income Recognized	729	587
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	87,019	83,555
Unpaid Principal Balance	89,490	93,048
Related Allowance	6,899	16,467
YTD Average Recorded Investment	92,350	88,855
YTD Interest Income Recognized	1,518	3,221
Commercial And Industrial Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	58,855	76,433
Unpaid Principal Balance	60,303	80,414
Related Allowance	6,899	16,467
YTD Average Recorded Investment	59,502	80,004
YTD Interest Income Recognized	970	3,139
Commercial And Industrial Financing Receivable [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	28,164	7,122
Unpaid Principal Balance	29,187	12,634
Related Allowance	0	0
YTD Average Recorded Investment	32,848	8,851
YTD Interest Income Recognized	548	82
Commercial Real Estate Owner Occupied [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,711	36,279
Unpaid Principal Balance	21,231	40,826
Related Allowance	571	3,221
YTD Average Recorded Investment	21,378	38,848
YTD Interest Income Recognized	363	900
Commercial Real Estate Owner Occupied [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,537	19,839
Unpaid Principal Balance	9,660	21,807
Related Allowance	571	3,221
YTD Average Recorded Investment	9,784	20,878
YTD Interest Income Recognized	274	681
Commercial Real Estate Owner Occupied [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,174	16,440
Unpaid Principal Balance	11,571	19,019
Related Allowance	0	0
YTD Average Recorded Investment	11,594	17,970
YTD Interest Income Recognized	89	219
Lease Financing [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,763	1,801
Unpaid Principal Balance	1,763	1,801
Related Allowance	0	574
YTD Average Recorded Investment	1,980	2,009
YTD Interest Income Recognized	0	0
Lease Financing [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	1,801
Unpaid Principal Balance	0	1,801
Related Allowance	0	574
YTD Average Recorded Investment	0	2,009
YTD Interest Income Recognized	0	0
Lease Financing [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,763	0
Unpaid Principal Balance	1,763	0
Related Allowance	0	0
YTD Average Recorded Investment	1,980	0
YTD Interest Income Recognized	0	0
Commercial And Business Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	109,493	121,635
Unpaid Principal Balance	112,484	135,675
Related Allowance	7,470	20,262
YTD Average Recorded Investment	115,708	129,712
YTD Interest Income Recognized	1,881	4,121
Commercial And Business Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	68,392	98,073
Unpaid Principal Balance	69,963	104,022
Related Allowance	7,470	20,262
YTD Average Recorded Investment	69,286	102,891
YTD Interest Income Recognized	1,244	3,820
Commercial And Business Lending [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	41,101	23,562
Unpaid Principal Balance	42,521	31,653
Related Allowance	0	0
YTD Average Recorded Investment	46,422	26,821
YTD Interest Income Recognized	637	301
Commercial Real Estate Investor [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	25,501	45,812
Unpaid Principal Balance	27,269	54,905
Related Allowance	1,349	3,587
YTD Average Recorded Investment	25,715	48,671
YTD Interest Income Recognized	868	1,383
Commercial Real Estate Investor [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	23,916	36,841
Unpaid Principal Balance	25,594	40,869
Related Allowance	1,349	3,587
YTD Average Recorded Investment	24,119	38,657
YTD Interest Income Recognized	834	1,250
Commercial Real Estate Investor [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,585	8,971
Unpaid Principal Balance	1,675	14,036
Related Allowance	0	0
YTD Average Recorded Investment	1,596	10,014
YTD Interest Income Recognized	34	133
Real Estate Construction [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,482	6,126
Unpaid Principal Balance	2,112	9,725
Related Allowance	474	1,095
YTD Average Recorded Investment	1,643	7,059
YTD Interest Income Recognized	42	105
Real Estate Construction [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,482	3,043
Unpaid Principal Balance	2,112	5,910
Related Allowance	474	1,095
YTD Average Recorded Investment	1,643	3,818
YTD Interest Income Recognized	42	105
Real Estate Construction [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	3,083
Unpaid Principal Balance	0	3,815
Related Allowance	0	0
YTD Average Recorded Investment	0	3,241
YTD Interest Income Recognized	0	0
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	26,983	51,938
Unpaid Principal Balance	29,381	64,630
Related Allowance	1,823	4,682
YTD Average Recorded Investment	27,358	55,730
YTD Interest Income Recognized	910	1,488
Commercial Real Estate Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	25,398	39,884
Unpaid Principal Balance	27,706	46,779
Related Allowance	1,823	4,682
YTD Average Recorded Investment	25,762	42,475
YTD Interest Income Recognized	876	1,355
Commercial Real Estate Lending [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,585	12,054
Unpaid Principal Balance	1,675	17,851
Related Allowance	0	0
YTD Average Recorded Investment	1,596	13,255
YTD Interest Income Recognized	34	133
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	136,476	173,573
Unpaid Principal Balance	141,865	200,305
Related Allowance	9,293	24,944
YTD Average Recorded Investment	143,066	185,442
YTD Interest Income Recognized	2,791	5,609
Commercial Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	93,790	137,957
Unpaid Principal Balance	97,669	150,801
Related Allowance	9,293	24,944
YTD Average Recorded Investment	95,048	145,366
YTD Interest Income Recognized	2,120	5,175
Commercial Financing Receivable [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	42,686	35,616
Unpaid Principal Balance	44,196	49,504
Related Allowance	0	0
YTD Average Recorded Investment	48,018	40,076
YTD Interest Income Recognized	671	434
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,586	24,660
Unpaid Principal Balance	22,742	27,391
Related Allowance	9,655	11,382
YTD Average Recorded Investment	21,267	25,938
YTD Interest Income Recognized	817	1,275
Home Equity [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,526	23,874
Unpaid Principal Balance	22,682	26,585
Related Allowance	9,655	11,382
YTD Average Recorded Investment	21,207	25,087
YTD Interest Income Recognized	816	1,257
Home Equity [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	60	786
Unpaid Principal Balance	60	806
Related Allowance	0	0
YTD Average Recorded Investment	60	851
YTD Interest Income Recognized	1	18
Installment and Credit Cards [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,190	1,587
Unpaid Principal Balance	1,292	1,795
Related Allowance	210	308
YTD Average Recorded Investment	1,252	1,736
YTD Interest Income Recognized	25	58
Installment and Credit Cards [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,190	1,587
Unpaid Principal Balance	1,292	1,795
Related Allowance	210	308
YTD Average Recorded Investment	1,252	1,736
YTD Interest Income Recognized	25	58
Installment and Credit Cards [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
YTD Average Recorded Investment	0	0
YTD Interest Income Recognized	0	0
Residential Mortgage [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	72,011	75,809
Unpaid Principal Balance	77,469	81,320
Related Allowance	12,555	13,797
YTD Average Recorded Investment	73,251	77,254
YTD Interest Income Recognized	1,788	2,442
Residential Mortgage [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	67,333	68,748
Unpaid Principal Balance	72,537	74,005
Related Allowance	12,555	13,797
YTD Average Recorded Investment	68,551	70,030
YTD Interest Income Recognized	1,731	2,307
Residential Mortgage [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	4,678	7,061
Unpaid Principal Balance	4,932	7,315
Related Allowance	0	0
YTD Average Recorded Investment	4,700	7,224
YTD Interest Income Recognized	57	135
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	93,787	102,056
Unpaid Principal Balance	101,503	110,506
Related Allowance	22,420	25,487
YTD Average Recorded Investment	95,770	104,928
YTD Interest Income Recognized	2,630	3,775
Consumer Loan [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	89,049	94,209
Unpaid Principal Balance	96,511	102,385
Related Allowance	22,420	25,487
YTD Average Recorded Investment	91,010	96,853
YTD Interest Income Recognized	2,572	3,622
Consumer Loan [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	4,738	7,847
Unpaid Principal Balance	4,992	8,121
Related Allowance	0	0
YTD Average Recorded Investment	4,760	8,075
YTD Interest Income Recognized	$ 58	$ 153

Loans, Allowance for Credit L59

Loans, Allowance for Credit Losses, and Credit Quality Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 82,809	$ 98,216
Nonaccrual Restructured Loans	36,583	57,656
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	28,598	33,892
Nonaccrual Restructured Loans	1,946	3,260
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,343	10,454
Nonaccrual Restructured Loans	2,796	5,656
Commercial Real Estate Investor [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	18,580	23,127
Nonaccrual Restructured Loans	4,268	15,216
Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	485	727
Nonaccrual Restructured Loans	173	2,438
Home Equity Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	6,945	8,209
Nonaccrual Restructured Loans	4,137	4,838
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	804	974
Nonaccrual Restructured Loans	65	199
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	20,054	20,833
Nonaccrual Restructured Loans	$ 23,198	$ 26,049

Loans, Allowance for Credit L60

Loans, Allowance for Credit Losses, and Credit Quality Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)loan	Sep. 30, 2014USD ($)loan	Sep. 30, 2015USD ($)loan	Sep. 30, 2014USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	67	103	156	203
Recorded Investment	$ 5,056	$ 18,504	$ 17,713	$ 26,373
Unpaid Principal Balance	$ 5,318	$ 19,168	$ 18,849	$ 27,599
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	10	10	13
Recorded Investment	$ 893	$ 7,383	$ 2,410	$ 7,695
Unpaid Principal Balance	$ 896	$ 7,384	$ 3,033	$ 7,707
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	4	2
Recorded Investment	$ 0	$ 0	$ 2,847	$ 1,123
Unpaid Principal Balance	$ 0	$ 0	$ 3,007	$ 1,260
Commercial Real Estate Investor [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	3	3	4
Recorded Investment	$ 711	$ 5,603	$ 2,949	$ 6,096
Unpaid Principal Balance	$ 761	$ 5,918	$ 2,998	$ 6,425
Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	1	2
Recorded Investment	$ 0	$ 8	$ 5	$ 14
Unpaid Principal Balance	$ 0	$ 8	$ 5	$ 14
Home Equity Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	27	38	61	85
Recorded Investment	$ 840	$ 1,121	$ 2,109	$ 2,784
Unpaid Principal Balance	$ 940	$ 1,179	$ 2,220	$ 2,970
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		2		3
Recorded Investment		$ 25		$ 34
Unpaid Principal Balance		$ 25		$ 45
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	33	49	77	94
Recorded Investment	$ 2,612	$ 4,364	$ 7,393	$ 8,627
Unpaid Principal Balance	$ 2,721	$ 4,654	$ 7,586	$ 9,178

Loans, Allowance for Credit L61

Loans, Allowance for Credit Losses, and Credit Quality Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)loan	Sep. 30, 2014USD ($)loan	Sep. 30, 2015USD ($)loan	Sep. 30, 2014USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	33	32	68	84
Recorded Investment	$ 2,432	$ 2,372	$ 5,253	$ 7,744
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0	1	1
Recorded Investment	$ 153	$ 0	$ 153	$ 52
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	1	2
Recorded Investment	$ 0	$ 0	$ 297	$ 203
Commercial Real Estate Investor [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		1		2
Recorded Investment		$ 493		$ 1,613
Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		0		1
Recorded Investment		$ 0		$ 160
Home Equity Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	14	11	21	20
Recorded Investment	$ 421	$ 312	$ 627	$ 598
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		1		3
Recorded Investment		$ 10		$ 34
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	18	19	45	55
Recorded Investment	$ 1,858	$ 1,557	$ 4,176	$ 5,084

Loans, Allowance for Credit L62

Loans, Allowance for Credit Losses, and Credit Quality (Details Textuals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Reclassified Loans	$ 500,000		$ 500,000
Balance Prior to Reclassification, Consumer, Home Equity					$ 1,600,000
Balance Prior to Reclassification, Consumer, Mortgage					4,500,000
Home equity	1,014,465		1,014,465		1,051,927
Residential mortgage	5,682,178		5,682,178		5,056,891
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	262,536		262,536		266,302	$ 268,315
Recorded Investment	5,056	$ 18,504	17,713	$ 26,373
Restructured Loans Subsequently Accruing	2,000		2,000
YTD Restructured Loans Still On Nonaccrual	16,000		16,000
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	118,494		118,494		116,025	$ 104,501
Commercial and Industrial [Member] | Oil and Gas Industry [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 29,000		$ 29,000		$ 17,000
Allocated allowance for loan losses, percent	3.83%		3.83%		2.26%

Goodwill and Other Intangible63

Goodwill and Other Intangible Assets Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 885	$ 990	$ 2,574	$ 2,972
Core Deposit Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	36,230		36,230		$ 36,230
Accumulated amortization	(35,759)		(35,759)		(34,433)
Amortization Expense	471		471		1,797
Amortization of other intangible assets			1,326		2,868
Other Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	31,398		31,398		19,283
Accumulated amortization	(14,891)		(14,891)		(13,643)
Amortization Expense	$ 16,507		16,507		5,640
Additions during the period			12,115		0
Amortization of other intangible assets			$ 1,248		$ 879

Goodwill and Other Intangible64

Goodwill and Other Intangible Assets Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Mortgage servicing rights:
Mortgage servicing rights at beginning of period	$ 61,379	$ 64,193	$ 64,193
Additions	9,853	5,844	8,253
Amortization	(8,902)		(11,067)
Mortgage servicing rights at end of period	62,330		61,379
Valuation allowance for mortgage servicing rights
Valuation allowance at beginning of period	(1,234)	$ (913)	(913)
(Additions) recoveries, net	306		(321)
Valuation allowance at end of period	(928)		(1,234)
Mortgage servicing rights, net	61,402		60,145
Fair value of mortgage servicing rights	67,794		66,342
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,906,960		$ 7,999,294
Mortgage servicing rights, net to servicing portfolio	0.78%		0.75%
Mortgage servicing rights expense	$ 8,596		$ 11,388

Goodwill and Other Intangible65

Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Core Deposit Intangibles [Member]
Estimated future amortization expense
Three months ending December 31, 2015	$ 78
Year ending December 31, 2016	281
Year ending December 31, 2017	112
Year ending December 31, 2018	0
Year ending December 31, 2019	0
Year ending December 31, 2020	0
Beyond 2,020	0
Amortization Expense	471	$ 1,797
Other Intangibles [Member]
Estimated future amortization expense
Three months ending December 31, 2015	442
Year ending December 31, 2016	1,735
Year ending December 31, 2017	1,702
Year ending December 31, 2018	1,672
Year ending December 31, 2019	1,373
Year ending December 31, 2020	1,256
Beyond 2,020	8,327
Amortization Expense	16,507	$ 5,640
Mortgage Service Rights [Member]
Estimated future amortization expense
Three months ending December 31, 2015	2,869
Year ending December 31, 2016	10,147
Year ending December 31, 2017	8,341
Year ending December 31, 2018	6,919
Year ending December 31, 2019	5,781
Year ending December 31, 2020	4,842
Beyond 2,020	23,431
Amortization Expense	$ 62,330

Goodwill and Other Intangible66

Goodwill and Other Intangible Assets (Goodwill Narrative) (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 968,844	$ 929,168
Ahmann & Martin Co. [Member]
Goodwill [Line Items]
Goodwill acquired	$ 40,000

Goodwill and Other Intangible67

Goodwill and Other Intangible Assets (Other Intangible Assets Narrative) (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Ahmann & Martin Co. [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, additions during the period	$ 12

Short and Long-Term Funding (Co

Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Short-Term Funding
Federal funds purchased	$ 177,940	$ 109,770
Securities sold under agreements to repurchase	524,629	384,221
Federal funds purchased and securities sold under agreements to repurchase	702,569	493,991
FHLB advances	260,000	500,000
Commercial paper	59,766	74,297
Other short-term funding	319,766	574,297
Total short-term funding	1,022,335	1,068,288
Long-Term Funding
FHLB advances	1,750,234	3,000,260
Senior notes, at par	680,000	680,000
Subordinated notes, at par	250,000	250,000
Other long-term funding and capitalized costs	(692)	(143)
Total long-term funding	2,679,542	3,930,117
Total short and long-term funding	$ 3,701,877	$ 4,998,405

Short and Long-Term Funding (Lo

Short and Long-Term Funding (Long-term Funding Narrative) (Details Textual) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Nov. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2011	Mar. 31, 2011
Long Term Debt Disclosure [Line Items]
FHLB advances		$ 648
Weighted average interest rate of Long-term advances		0.13%	0.11%
Debt instrument description of variable rate basis		FHLB discount note
2011 Senior Notes [Member] | Senior Notes [Member]
Long Term Debt Disclosure [Line Items]
Debt issuance				$ 130	$ 300
Percentage of interest rate on senior notes					5.125%
2014 Senior Notes [Member] | Senior Notes [Member]
Long Term Debt Disclosure [Line Items]
Debt issuance	$ 250
Percentage of interest rate on senior notes	2.75%
2014 Subordinated Notes [Member] | Subordinated Debt [Member]
Long Term Debt Disclosure [Line Items]
Debt issuance	$ 250
Percentage of interest rate on senior notes	4.25%
Debt term	10 years

Short and Long-Term Funding Rem

Short and Long-Term Funding Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	$ 524,629,000
Gross amounts of recognized liabilities for repurchase agreements	524,629,000	$ 384,221,000
Government Sponsored Enterprise (GSE) [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	524,629,000
Maturity Overnight and Continuous [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	524,629,000
Maturity Overnight and Continuous [Member] | Government Sponsored Enterprise (GSE) [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	524,629,000
Maturity Less than 30 Days [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	0
Maturity Less than 30 Days [Member] | Government Sponsored Enterprise (GSE) [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	0
Maturity 30 to 90 Days [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	0
Maturity 30 to 90 Days [Member] | Government Sponsored Enterprise (GSE) [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	0
Maturity Greater than 90 Days [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	0
Maturity Greater than 90 Days [Member] | Government Sponsored Enterprise (GSE) [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Remaining contractual maturity of the agreements	$ 0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 21,551	$ 24,478	$ 65,806	$ 66,775
Effective income tax rate			31.14%	32.02%

Derivative and Hedging Activi72

Derivative and Hedging Activities Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Fair Value	$ 42,593	$ 33,023
Trading Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,706,721	1,636,480
Fair Value	$ 42,593	$ 33,023
Receive Rate	1.42%	1.60%
Pay Rate	1.42%	1.60%
Maturity	41 months	42 months
Trading Assets [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 54,421	$ 60,742
Fair Value	1,159	2,140
Trading Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,706,721	1,636,480
Fair Value	$ (44,857)	$ (35,372)
Receive Rate	1.42%	1.60%
Pay Rate	1.42%	1.60%
Maturity	41 months	42 months
Trading Liabilities [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 46,201	$ 56,573
Fair Value	(960)	(1,957)
Other Assets [Member] | Interest Rate Lock Commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	173,622	126,379
Fair Value	2,584	1,947
Other Assets [Member] | Purchased deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	105,345	110,347
Fair Value	2,915	6,054
Other Liabilities [Member] | Forward Commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	245,138	234,500
Fair Value	(1,982)	(2,435)
Other Liabilities [Member] | Written deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	105,345	110,347
Fair Value	$ (2,915)	$ (6,054)

Derivative and Hedging Activi73

Derivative and Hedging Activities Gains and Losses on Derivative Instruments Not Designated at Hedging Instruments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Capital Market Fees, Net [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	$ 85	$ 626
Capital Market Fees, Net [Member] | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	16	118
Mortgage Banking, Net [Member] | Interest Rate Lock Commitments (mortgage) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	637	1,024
Mortgage Banking, Net [Member] | Forward Contracts (mortgage) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	$ 453	$ (1,924)

Derivative and Hedging Activi74

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 10	$ 11
Derivative collateral right to reclaim cash	$ 33	$ 15

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 48	$ 558
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	48	558
Financial instruments	(48)	(558)
Collateral	0	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	44,210	34,087
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	44,210	34,087
Financial instruments	(48)	(558)
Collateral	(42,658)	(26,105)
Net amount	$ 1,504	$ 7,424

Commitments, Off-Balance Shee76

Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summary of lending-related and other commitments
Standby letters of credit Fair value	$ 3,164	$ 3,542
Commitments to Extend Credit, excluding commitments to originate residential mortgage loans held for sale [Member]
Summary of lending-related and other commitments
Lending related commitments	6,935,786	6,884,411
Commercial Letters Of Credit [Member]
Summary of lending-related and other commitments
Lending related commitments	11,484	9,179
Standby Letters of Credit [Member]
Summary of lending-related and other commitments
Lending related commitments	317,079	353,292
Standby letters of credit Fair value	$ 3,000	$ 4,000

Commitments, Off-Balance Shee77

Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Residential Mortgage Repurchase Reserve (Details) - Mortgage Repurchase Reserve [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Residential mortgage repurchase reserve
Balance at beginning of period	$ 3,258	$ 5,737
Repurchase provision expense	340	505
Adjustments to provision expense	(2,450)	(2,250)
Charge offs	(23)	(734)
Balance at end of period	$ 1,125	$ 3,258

Commitments, Off-Balance Shee78

Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Details Textuals)	May. 22, 2015USD ($)loan_production_officebranch	Sep. 30, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments		$ 41,000,000	$ 27,000,000
Commitments under unconsolidated projects		33,000,000	28,000,000
Conciliation agreement term	3 years
Mortgage loan commitment under the conciliation agreement	$ 196,000,000
Number of branch openings under the conciliation agreement | branch	1
Number of loan production offices under the conciliation agreement | loan_production_office	4
Cost of conciliation agreement term	4 years
Loans repurchased under make whole requests		3,000,000	5,000,000
Loss reimbursements under make whole requests		117,000	734,000
Loans sold to outside investors original amount		19,600,000,000
Loans sold to outside investors remaining outstanding amount		7,500,000,000
Residential mortgage loans sold with recourse risk		69,000,000	46,000,000
Residential mortgage loans sold with credit recourse risk		142,000,000	178,000,000
Mortgage Repurchase Reserve [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments		1,125,000	3,258,000	$ 5,737,000
Reserve for Off-balance Sheet Activities [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments		$ 23,900,000	$ 24,900,000	$ 21,900,000

Fair Value Measurements Asset a

Fair Value Measurements Asset and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment securities available for sale:
Investment securities available for sale, at fair value	$ 5,403,656	$ 5,396,812
Trading assets	43,752	35,163
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	45,817	37,329
Fair Value, Measurements, Recurring [Member]
Investment securities available for sale:
Trading assets	49,251	43,164
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	50,714	45,818
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,002	998
Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	427,701	582,679
Fair Value, Measurements, Recurring [Member] | Government Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	3,088,923	3,730,789
Fair Value, Measurements, Recurring [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,746	2,294
Fair Value, Measurements, Recurring [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,877,581	1,073,893
Fair Value, Measurements, Recurring [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	6,703	6,159
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	4,505	3,957
Trading assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,002	998
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Government Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	3,503	2,959
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	5,398,951	5,392,655
Trading assets	46,667	41,217
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	48,732	43,383
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	427,701	582,679
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Government Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	3,088,923	3,730,789
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,746	2,294
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,877,581	1,073,893
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	3,000	3,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	200	200
Trading assets	2,584	1,947
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,982	2,435
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Government Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	$ 200	$ 200

Fair Value Measurements Assets

Fair Value Measurements Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Available-for-sale Securities [Member]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 200	$ 299
Total net gain (losses) included in income:
Sales of investment securities		(99)
Ending Balance	200	200
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative gain (loss)	0	0
Derivatives [Member]
Total net gain (losses) included in income:
Sales of investment securities		0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	(488)	1,717
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative gain (loss)	1,090	(2,205)
Ending Balance	$ 602	$ (488)

Fair Value Measurements Asset81

Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	$ 106,276	$ 156,423
Mortgage servicing rights	61,402	60,145
Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	106,276	156,423
Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Fair Value, Measurements, Nonrecurring [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	106,276	156,423
Impaired Loans	72,661	83,956
Mortgage servicing rights	67,794	66,342
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Impaired Loans	0	0
Mortgage servicing rights	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	106,276	156,423
Impaired Loans	0	0
Mortgage servicing rights	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Impaired Loans	72,661	83,956
Mortgage servicing rights	$ 67,794	$ 66,342

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial assets
Cash and due from banks	$ 303,701	$ 444,113
Cash and due from banks, Fair Value	303,701	444,113
Interest-bearing deposits in other financial institutions	70,023	571,924
Interest-bearing deposits in other financial institutions, Fair value	70,023	571,924
Federal funds sold and securities purchased under agreements to resell	36,490	16,030
Federal funds sold and securities purchased under agreements to resell, Fair value	36,490	16,030
Investment securities held to maturity, carrying amount	604,799	404,455
Fair value	613,372	413,067
Investment securities available for sale, at fair value	5,403,656	5,396,812
Investment securities available for sale, fair value	5,403,656	5,396,812
Federal Home Loan Bank and Federal Reserve Bank stocks, carrying amount	160,871	189,107
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	160,871	189,107
Loans held for sale	105,144	154,935
Loans held for sale, fair value	106,276	156,423
Loans, net	18,262,237	17,327,544
Loans, net Fair value	18,435,809	17,427,647
Bank owned life insurance, carrying amount	580,289	574,154
Bank owned life insurance, Fair value	580,289	574,154
Accrued interest receivable, carrying amount	70,977	67,573
Accrued interest receivable, Fair value	70,977	67,573
Interest rate-related agreements, carrying amount	42,593	33,023
Interest rate-related agreements, fair value	42,593	33,023
Foreign currency exchange forwards	1,159	2,140
Foreign currency exchange forwards, Fair value	1,159	2,140
Interest rate lock commitments to originate residential mortgage loans held for sale	2,584	1,947
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	2,584	1,947
Purchased options (time deposit), carrying value	2,915	6,054
Purchased options (time deposit), fair value	2,915	6,054
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	18,936,600	17,192,049
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	18,936,600	17,192,049
Brokered CDs and other time deposits	1,621,795	1,571,455
Brokered CDs and other time deposits, Fair value	1,632,811	1,571,455
Short-term funding	1,022,335	1,068,288
Short-term funding, Fair value	1,022,335	1,068,288
Long-term funding	2,679,542	3,930,117
Long-term funding, fair value	2,740,335	3,975,605
Accrued interest payable	6,888	9,530
Accrued interest payable, Fair value	6,888	9,530
Interest rate-related agreements	44,857	35,372
Interest rate-related agreements, Fair value	44,857	35,372
Foreign currency exchange forwards	960	1,957
Foreign currency exchange forwards, Fair value	960	1,957
Standby letters of credit, carrying amount	3,164	3,542
Standby letters of credit, Fair value	3,164	3,542
Forward commitments to sell residential mortgage loans	1,982	2,435
Forward commitments to sell residential mortgage loans, fair value	1,982	2,435
Written options (time deposit), carrying value	2,915	6,054
Written option (time deposit), fair value	2,915	6,054
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks, Fair Value	303,701	444,113
Interest-bearing deposits in other financial institutions, Fair value	70,023	571,924
Federal funds sold and securities purchased under agreements to resell, Fair value	36,490	16,030
Fair value	0	0
Investment securities available for sale, fair value	4,505	3,957
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	0	0
Loans held for sale, fair value	0	0
Loans, net Fair value	0	0
Bank owned life insurance, Fair value	0	0
Accrued interest receivable, Fair value	70,977	67,573
Interest rate-related agreements, fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	0	0
Purchased options (time deposit), fair value	0	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	0	0
Brokered CDs and other time deposits, Fair value	0	0
Short-term funding, Fair value	0	0
Long-term funding, fair value	0	0
Accrued interest payable, Fair value	6,888	9,530
Interest rate-related agreements, Fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Standby letters of credit, Fair value	0	0
Forward commitments to sell residential mortgage loans, fair value	0	0
Written option (time deposit), fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks, Fair Value	0	0
Interest-bearing deposits in other financial institutions, Fair value	0	0
Federal funds sold and securities purchased under agreements to resell, Fair value	0	0
Fair value	613,372	413,067
Investment securities available for sale, fair value	5,398,951	5,392,655
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	160,871	189,107
Loans held for sale, fair value	106,276	156,423
Loans, net Fair value	0	0
Bank owned life insurance, Fair value	580,289	574,154
Accrued interest receivable, Fair value	0	0
Interest rate-related agreements, fair value	42,593	33,023
Foreign currency exchange forwards, Fair value	1,159	2,140
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	0	0
Purchased options (time deposit), fair value	2,915	6,054
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	0	0
Brokered CDs and other time deposits, Fair value	1,632,811	1,571,455
Short-term funding, Fair value	1,022,335	1,068,288
Long-term funding, fair value	2,740,335	3,975,605
Accrued interest payable, Fair value	0	0
Interest rate-related agreements, Fair value	44,857	35,372
Foreign currency exchange forwards, Fair value	960	1,957
Standby letters of credit, Fair value	3,164	3,542
Forward commitments to sell residential mortgage loans, fair value	0	0
Written option (time deposit), fair value	2,915	6,054
Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and due from banks, Fair Value	0	0
Interest-bearing deposits in other financial institutions, Fair value	0	0
Federal funds sold and securities purchased under agreements to resell, Fair value	0	0
Fair value	0	0
Investment securities available for sale, fair value	200	200
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	0	0
Loans held for sale, fair value	0	0
Loans, net Fair value	18,435,809	17,427,647
Bank owned life insurance, Fair value	0	0
Accrued interest receivable, Fair value	0	0
Interest rate-related agreements, fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	2,584	1,947
Purchased options (time deposit), fair value	0	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	18,936,600	17,192,049
Brokered CDs and other time deposits, Fair value	0	0
Short-term funding, Fair value	0	0
Long-term funding, fair value	0	0
Accrued interest payable, Fair value	0	0
Interest rate-related agreements, Fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Standby letters of credit, Fair value	0	0
Forward commitments to sell residential mortgage loans, fair value	1,982	2,435
Written option (time deposit), fair value	$ 0	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value Measurements (Textuals) [Abstract]
Other real estate owned measured at fair value	$ 6	$ 21
Write down of Other Real Estate Owned	1	2
Commitment on standby letters of credit	$ 317	$ 353
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage derivative interest rate lock commitments closing ratio	87.00%
Mortgage servicing rights (MSR) weighted average constant prepayment rate	13.40%
Weighted average discount rate	9.60%
Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Weighted average discount rate	20.00%
Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Weighted average discount rate	10.00%

Retirement Plans Components of

Retirement Plans Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Retirement Plans (Textuals) [Abstract]
Defined Benefit Plan, Age of Eligibility of Plan			55 years
Years of service required for eligibility in plan			5 years
Pension Plans, Defined Benefit [Member]
Net period benefit cost for the pension and postretirement plans
Service cost	$ 2,318	$ 2,975	$ 8,443	$ 8,925	$ 11,058
Interest cost	1,678	1,790	4,963	5,370	7,132
Expected return on plan assets	(5,379)	(4,855)	(16,079)	(14,565)	(19,922)
Amortization of prior service cost	12	15	37	45	58
Amortization of actuarial gain (loss)	627	326	1,692	975	1,384
Total net periodic benefit cost	(744)	251	(944)	750	(290)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net period benefit cost for the pension and postretirement plans
Interest cost	35	39	105	116	150
Amortization of actuarial gain (loss)	0	(9)	0	(26)	(35)
Total net periodic benefit cost	$ 35	$ 30	$ 105	$ 90	$ 115

Segment Reporting Selected Segm

Segment Reporting Selected Segment Income Statement and Balance Sheet Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Income Statement Data Abstract
Net interest income	$ 170,509	$ 172,630	$ 504,810	$ 506,306
Noninterest income	79,916	74,908	246,513	220,676
Total revenue	250,425	247,538	751,323	726,982
Credit provision	8,000	1,000	17,500	11,000
Noninterest expense	171,436	171,853	522,507	507,436
Income before income taxes	70,989	74,685	211,316	208,546
Income tax expense (benefit)	21,551	24,478	65,806	66,775
Net income	$ 49,438	$ 50,207	$ 145,510	$ 141,771
Return on average allocated capital (ROTICE)	10.20%	10.40%	10.30%	9.80%
Segment Balance Sheet Data
Average earning assets	$ 24,834,014	$ 23,096,717	$ 24,418,648	$ 22,513,323
Average loans	18,452,749	17,140,961	18,154,392	16,654,233
Average deposits	20,293,599	17,873,378	19,662,872	17,348,729
Average allocated capital (TICE)	1,837,436	1,871,246	1,820,612	1,887,412
Corporate and Commercial Specialty [Member]
Segment Income Statement Data Abstract
Net interest income	78,283	72,474	230,130	220,973
Noninterest income	11,305	11,888	36,222	35,971
Total revenue	89,588	84,362	266,352	256,944
Credit provision	10,851	11,074	30,312	37,021
Noninterest expense	37,293	35,044	106,643	110,558
Income before income taxes	41,444	38,244	129,397	109,365
Income tax expense (benefit)	13,955	12,343	44,384	35,767
Net income	$ 27,489	$ 25,901	$ 85,013	$ 73,598
Return on average allocated capital (ROTICE)	11.00%	13.80%	11.80%	12.80%
Segment Balance Sheet Data
Average earning assets	$ 9,475,469	$ 8,761,870	$ 9,373,312	$ 8,933,616
Average loans	9,466,761	8,750,207	9,363,936	8,922,631
Average deposits	6,044,306	5,092,314	5,730,918	5,129,046
Average allocated capital (TICE)	988,283	744,792	966,746	766,391
Community, Consumer, and Business [Member]
Segment Income Statement Data Abstract
Net interest income	88,209	82,067	261,951	227,409
Noninterest income	64,911	54,601	200,042	168,287
Total revenue	153,120	136,668	461,993	395,696
Credit provision	5,963	6,773	19,625	16,534
Noninterest expense	122,393	122,722	366,410	346,084
Income before income taxes	24,764	7,173	75,958	33,078
Income tax expense (benefit)	8,667	2,467	26,585	11,388
Net income	$ 16,097	$ 4,706	$ 49,373	$ 21,690
Return on average allocated capital (ROTICE)	10.10%	3.20%	10.30%	5.40%
Segment Balance Sheet Data
Average earning assets	$ 8,917,831	$ 8,310,839	$ 8,719,078	$ 7,646,487
Average loans	8,917,831	8,310,839	8,719,078	7,646,487
Average deposits	10,969,172	10,337,637	10,786,342	9,872,624
Average allocated capital (TICE)	632,878	583,096	640,116	535,528
Risk Management and Shared Services [Member]
Segment Income Statement Data Abstract
Net interest income	4,017	18,089	12,729	57,924
Noninterest income	3,700	8,419	10,249	16,418
Total revenue	7,717	26,508	22,978	74,342
Credit provision	(8,814)	(16,847)	(32,437)	(42,555)
Noninterest expense	11,750	14,087	49,454	50,794
Income before income taxes	4,781	29,268	5,961	66,103
Income tax expense (benefit)	(1,071)	9,668	(5,163)	19,620
Net income	$ 5,852	$ 19,600	$ 11,124	$ 46,483
Return on average allocated capital (ROTICE)	6.70%	13.40%	3.90%	9.80%
Segment Balance Sheet Data
Average earning assets	$ 6,440,714	$ 6,024,008	$ 6,326,258	$ 5,933,220
Average loans	68,157	79,915	71,378	85,115
Average deposits	3,280,121	2,443,427	3,145,612	2,347,059
Average allocated capital (TICE)	$ 216,275	$ 543,358	$ 213,750	$ 585,493

Accumulated Other Comprehensi86

Accumulated Other Comprehensive Income (Loss) Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 2,594	$ 10,494	$ (4,850)	$ (24,244)
Other Comprehensive Income before reclassifications	22,907	(20,123)	35,101	36,061
Amounts reclassified from accumulated other comprehensive income (loss)	(2,157)	275	(2,309)	525
Income tax expense	(7,968)	7,629	(12,566)	(14,067)
Total other comprehensive income (loss)	12,782	(12,219)	20,226	22,519
Ending Balance	15,376	(1,725)	15,376	(1,725)
Investment Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	25,282	22,935	18,512	(11,396)
Other Comprehensive Income before reclassifications	22,907	(20,123)	35,101	36,061
Amounts reclassified from accumulated other comprehensive income (loss)	(2,796)	(57)	(4,038)	(469)
Income tax expense	(7,725)	7,757	(11,907)	(13,684)
Total other comprehensive income (loss)	12,386	(12,423)	19,156	21,908
Ending Balance	37,668	10,512	37,668	10,512
Defined Benefit Pension and Postretirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(22,688)	(12,441)	(23,362)	(12,848)
Other Comprehensive Income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	639	332	1,729	994
Income tax expense	(243)	(128)	(659)	(383)
Total other comprehensive income (loss)	396	204	1,070	611
Ending Balance	$ (22,292)	$ (12,237)	$ (22,292)	$ (12,237)