Associated Banc-Corp (ASB) 10-Q 27 Apr 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 26, 2017
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	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		152,319,854

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks		$ 332,601	$ 446,558
Interest-bearing deposits in other financial institutions		337,167	149,175
Federal funds sold and securities purchased under agreements to resell		19,700	46,500
Investment securities held to maturity, at amortized cost		1,554,843	1,273,536
Investment securities available for sale, at fair value		4,300,490	4,680,226
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		139,273	140,001
Residential loans held for sale		34,051	108,010
Commercial loans held for sale		2,901	12,474
Loans		20,147,683	20,054,716
Allowance for loan losses		(282,672)	(278,335)
Loans, net		19,865,011	19,776,381
Premises and equipment, net		332,884	330,315
Goodwill		972,006	971,951
Mortgage servicing rights		60,702	61,476
Other intangible assets		15,026	15,377
Trading assets		49,306	52,398
Other assets	[1]	1,093,896	1,074,937
Total assets		29,109,857	29,139,315
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits		5,338,212	5,392,208
Interest-bearing deposits		16,489,823	16,496,240
Total deposits		21,828,035	21,888,448
Federal funds purchased and securities sold under agreements to repurchase		650,188	508,347
Other short-term funding		430,679	583,688
Long-term funding	[1]	2,761,955	2,761,795
Trading liabilities		47,561	51,103
Accrued expenses and other liabilities		246,645	254,622
Total liabilities		25,965,063	26,048,003
Stockholders’ equity
Preferred equity		159,929	159,929
Common stock		1,630	1,630
Surplus		1,469,744	1,459,498
Retained earnings		1,709,514	1,695,764
Accumulated other comprehensive loss		(56,344)	(54,679)
Treasury stock, at cost		(139,679)	(170,830)
Total common equity		2,984,865	2,931,383
Total stockholders’ equity		3,144,794	3,091,312
Total liabilities and stockholders’ equity		$ 29,109,857	$ 29,139,315
Preferred shares issued (in shares)		165,000	165,000
Preferred shares authorized (par value $1.00 per share) (in shares)		750,000	750,000
Common shares issued (in shares)		163,030,209	163,030,209
Common shares authorized (par value $0.01 per share) (in shares)		250,000,000	250,000,000
Treasury shares of common stock (in shares)		9,296,566	10,909,362
[1]	(1)Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements.

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
INTEREST INCOME
Interest and fees on loans	$ 173,649	$ 159,656
Interest and dividends on investment securities:
Taxable	23,475	25,516
Tax exempt	8,129	7,830
Other interest	1,536	1,067
Total interest income	206,789	194,069
INTEREST EXPENSE
Interest on deposits	16,924	11,766
Interest on Federal funds purchased and securities sold under agreements to repurchase	515	296
Interest on other short-term funding	1,080	515
Interest on long-term funding	7,996	9,505
Total interest expense	26,515	22,082
NET INTEREST INCOME	180,274	171,987
Provision for credit losses	9,000	20,000
Net interest income after provision for credit losses	171,274	151,987
NONINTEREST INCOME
Trust service fees	11,935	11,447
Service charges on deposit accounts	16,356	16,273
Card-based and other nondeposit fees	12,465	11,991
Insurance commissions	21,620	21,382
Brokerage and annuity commissions	4,333	3,794
Mortgage banking, net	4,579	4,204
Capital market fees, net	3,883	3,538
Bank owned life insurance income	2,615	4,770
Asset gains (losses), net	(234)	524
Investment securities gains, net	0	3,098
Other	2,279	2,171
Total noninterest income	79,831	83,192
NONINTEREST EXPENSE
Personnel expense	104,419	101,398
Occupancy	15,219	13,802
Equipment	5,485	5,446
Technology	14,420	14,264
Business development and advertising	5,835	8,211
Other intangible amortization	513	504
Loan expense	2,620	3,221
Legal and professional fees	4,166	5,025
Foreclosure / OREO expense	1,505	1,877
FDIC expense	8,000	7,750
Other	11,509	12,473
Total noninterest expense	173,691	173,971
Income before income taxes	77,414	61,208
Income tax expense	21,144	18,674
Net income	56,270	42,534
Preferred stock dividends	2,330	2,198
Net income available to common equity	$ 53,940	$ 40,336
Earnings per common share:
Basic (in usd per share)	$ 0.36	$ 0.27
Diluted (in usd per share)	$ 0.35	$ 0.27
Average common shares outstanding:
Basic (in shares)	150,815	148,601
Diluted (in shares)	153,869	149,454

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 56,270	$ 42,534
Investment securities available for sale:
Net unrealized gains	3,152	60,422
Net unrealized losses on available for sale securities transferred to held to maturity securities	(5,264)	0
Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities	(1,027)	(1,572)
Reclassification adjustment for net gains realized in net income	0	(3,098)
Income tax (expense) benefit	1,195	(21,275)
Other comprehensive income (loss) on investment securities available for sale	(1,944)	34,477
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	(38)	13
Amortization of actuarial losses	488	482
Income tax expense	(171)	(189)
Other comprehensive income (loss) on pension and postretirement obligations	279	306
Total other comprehensive income (loss)	(1,665)	34,783
Comprehensive income	$ 54,605	$ 77,317

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Equity	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2015	$ 2,937,246	$ 121,379	$ 1,642	$ 1,458,522	$ 1,593,239	$ (32,616)	$ (204,920)
Comprehensive income:
Net income	42,534	0	0	0	42,534	0	0
Other comprehensive income	34,783	0	0	0	0	34,783	0
Comprehensive income	77,317
Common stock issued:
Stock-based compensation plans, net	2,205	0	0	613	(17,271)	0	18,863
Purchase of common stock returned to authorized but unissued	(20,007)	0	(12)	(19,995)	0	0	0
Purchase of treasury stock	(2,792)	0	0	0	0	0	(2,792)
Cash dividends:
Common stock dividends ($0.11 per share in 2016 and $0.12 per share in 2017)	(16,409)	0	0	0	(16,409)	0	0
Preferred stock dividends	(2,198)	0	0	0	(2,198)	0	0
Purchase of preferred stock	(1,092)	(1,032)	0	0	(60)	0	0
Stock-based compensation expense, net	8,066	0	0	8,066	0	0	0
Tax impact of stock-based compensation	162	0	0	162	0	0	0
Ending balance at Mar. 31, 2016	2,982,498	120,347	1,630	1,447,368	1,599,835	2,167	(188,849)
Beginning balance at Dec. 31, 2016	3,091,312	159,929	1,630	1,459,498	1,695,764	(54,679)	(170,830)
Comprehensive income:
Net income	56,270	0	0	0	56,270	0	0
Other comprehensive income	(1,665)	0	0	0	0	(1,665)	0
Comprehensive income	54,605
Common stock issued:
Stock-based compensation plans, net	17,940	0	0	868	(21,822)	0	38,894
Purchase of treasury stock	(7,743)	0	0	0	0	0	(7,743)
Cash dividends:
Common stock dividends ($0.11 per share in 2016 and $0.12 per share in 2017)	(18,368)	0	0	0	(18,368)	0	0
Preferred stock dividends	(2,330)	0	0	0	(2,330)	0	0
Stock-based compensation expense, net	8,344	0	0	8,344	0	0	0
Other	1,034	0	0	1,034	0	0	0
Ending balance at Mar. 31, 2017	$ 3,144,794	$ 159,929	$ 1,630	$ 1,469,744	$ 1,709,514	$ (56,344)	$ (139,679)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Common Stock
Cash dividends:
Common stock dividends (usd per share)	$ 0.12	$ 0.11

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 56,270	$ 42,534
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	9,000	20,000
Depreciation and amortization	11,505	11,060
Addition to valuation allowance on mortgage servicing rights, net	217	909
Amortization of mortgage servicing rights	2,477	2,874
Amortization of other intangible assets	513	504
Amortization and accretion on earning assets, funding, and other, net	8,215	10,692
Tax impact of stock based compensation	3,486	162
Gain on sales of investment securities, net	0	(3,098)
Asset (gains) losses, net	234	(524)
Gain on mortgage banking activities, net	5,171	(3,106)
Mortgage loans originated and acquired for sale	(101,280)	(193,849)
Proceeds from sales of mortgage loans held for sale	196,578	221,764
Increase in interest receivable	(761)	(5,180)
Decrease in interest payable	(185)	(6,121)
Commercial loans held for sale	(2,155)	(30,089)
Other, net	(19,532)	(46,160)
Net cash provided by operating activities	169,753	22,372
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(113,051)	(531,891)
Purchases of:
Available for sale securities	(163,442)	(182,895)
Held to maturity securities	(2,655)	(28,570)
Federal Home Loan Bank and Federal Reserve Bank stocks	(58,362)	(34,613)
Premises, equipment, and software, net of disposals	(13,586)	(70,685)
Other assets	(5,433)	(1,226)
Proceeds from:
Sales of available for sale securities	0	119,379
Proceeds from Sale of Federal Home Loan Bank Stock	59,090	0
Prepayments, calls, and maturities of available for sale investment securities	231,019	180,458
Prepayments, calls, and maturities of held to maturity investment securities	22,916	15,029
Sales, prepayments, calls, and maturities of other assets	3,293	9,566
Net cash paid in acquisition	(217)	(685)
Net cash used in investing activities	(40,428)	(526,133)
CASH FLOWS FROM FINANCING ACTIVITIES
Net decrease in deposits	(60,413)	(322,205)
Net increase (decrease) in short-term funding	(11,168)	582,992
Repayment of long-term funding	(8)	(430,010)
Proceeds from issuance of long-term funding	0	615,000
Proceeds from issuance of common stock for stock-based compensation plans	17,940	2,205
Purchase of preferred stock	0	(1,092)
Purchase of common stock returned to authorized but unissued	0	(20,007)
Purchase of treasury stock for tax withholding	(7,743)	(2,792)
Cash dividends on common stock	(18,368)	(16,409)
Cash dividends on preferred stock	(2,330)	(2,198)
Net cash provided by financing activities	(82,090)	405,484
Net increase (decrease) in cash and cash equivalents	47,235	(98,277)
Cash and cash equivalents at beginning of period	642,233	473,685	$ 473,685
Cash and cash equivalents at end of period	689,468	375,408	$ 642,233
Supplemental disclosures of cash flow information:
Cash paid for interest	26,531	28,041
Cash paid for income taxes	1,052	1,167
Loans and bank premises transferred to other real estate owned	921	3,160
Capitalized mortgage servicing rights	1,920	1,856
Loans transferred into held for sale from portfolio, net	13,905	0
Fair value of assets acquired, including cash and cash equivalents	0	522
Fair value ascribed to goodwill and intangible assets	217	4,119
Fair value of liabilities assumed	$ 0	$ 1,423

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2017
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.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions During the first quarter of 2017, the Corporation completed a small insurance acquisition to complement its existing insurance and benefits related products and services provided by Associated Benefits and Risk Consulting ("ABRC"). The Corporation recorded goodwill of $55,000 and other intangibles of $162,000 related to the insurance acquisition. During the first quarter of 2016, the Corporation completed two small insurance acquisitions to complement its existing insurance and benefits related products and services provided by ABRC. The Corporation recorded goodwill of $3 million and other intangibles of $1 million related to these insurance acquisitions. See Note 8 for additional information on goodwill and other intangible assets.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Accounting Policy Elections Effective January 1, 2017, residential mortgage loans that are classified as held for sale are accounted using the fair value option method of accounting. The Corporation has elected the fair value option to mitigate accounting mismatches between held for sale loan valuations and corresponding derivative commitments. Prior to January 1, 2017, residential mortgage loans that were classified as held for sale were accounted for at the lower of cost or market method (“LOCOM”) of accounting. New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2017-08 Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities The amendments of the new standard require that certain purchased callable debt securities held at a premium be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. 1st Quarter 2017 The Corporation early adopted with no material impact on results of operations, financial position, or liquidity. ASU 2017-03 Accounting Changes and Error Corrections (Topic 250) and Investments - Equity Method and Joint Ventures (Topic 323) The standard states that ASUs which have not been adopted yet, the registrant needs to determine the potential effects (if material) of those ASUs on the financial statements when adopted and include the appropriate disclosures in the financial statements. If the impact of adoption is unknown or cannot be estimated, the registrant should include a statement noting this and consider adding qualitative disclosures to the financial statements to assist the reader in evaluating the impact of the ASUs, when adopted, on the financial statements. 1st Quarter 2017 No material impact on results of operations, financial position, or liquidity. ASU 2016-17 Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control The FASB issued an amendment to address how a reporting entity that is a single decision maker of a variable interest entity treats indirect interests in the entity held through related parties that are under common control with the reporting entity. 1st Quarter 2017 No material impact on results of operations, financial position, or liquidity. ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting The FASB issued an amendment involving several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Entities should apply the amendment related to the timing of when excess tax benefits are recognized, minimum statutory withholding requirements, forfeitures, and intrinsic value using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is adopted. Entities should apply the amendment related to the presentation of employee taxes paid on the statement of cash flows when an employer withholds shares to meet the minimum statutory withholding requirement retrospectively. The amendment requiring recognition of excess tax benefits and tax deficiencies in the income statement and the practical expedient for estimating expected term should be applied prospectively. 4th Quarter 2016 The Corporation early adopted the accounting standard and recognized a $1 million reduction in income taxes for the excess tax benefits on stock-based compensation. The remaining provisions of this accounting standard did not have a material impact. ASU 2016-07 Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting The FASB issued an amendment to eliminate the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The amendments require that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. Entities should apply the amendment prospectively to increases in the level of ownership interest or degree of influence that result in the adoption of the equity method. 1st Quarter 2017 No material impact on results of operations, financial position, or liquidity.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Earnings per common 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 awards (outstanding stock options, unvested restricted stock awards, and outstanding common stock warrants). Presented below are the calculations for basic and diluted earnings per common share. For the Three Months Ended March 31, 2017 2016 (In thousands, except per share data) Net income $ 56,270 $ 42,534 Preferred stock dividends (2,330 ) (2,198 ) Net income available to common equity $ 53,940 $ 40,336 Common shareholder dividends (18,251 ) (16,203 ) Unvested share-based payment awards (117 ) (206 ) Undistributed earnings $ 35,572 $ 23,927 Undistributed earnings allocated to common shareholders 35,294 23,686 Undistributed earnings allocated to unvested share-based payment awards 278 241 Undistributed earnings $ 35,572 $ 23,927 Basic Distributed earnings to common shareholders $ 18,251 $ 16,203 Undistributed earnings allocated to common shareholders 35,294 23,686 Total common shareholders earnings, basic $ 53,545 $ 39,889 Diluted Distributed earnings to common shareholders $ 18,251 $ 16,203 Undistributed earnings allocated to common shareholders 35,294 23,686 Total common shareholders earnings, diluted $ 53,545 $ 39,889 Weighted average common shares outstanding 150,815 148,601 Effect of dilutive common stock awards 3,054 853 Diluted weighted average common shares outstanding 153,869 149,454 Basic earnings per common share $ 0.36 $ 0.27 Diluted earnings per common share $ 0.35 $ 0.27 Anti-dilutive common stock options of approximately 500,000 and 3 million for the three months ended March 31, 2017 and 2016 , respectively, were excluded from the earnings per common share calculation. Warrants to purchase approximately 4 million shares were outstanding for the three months ended March 31, 2016 , but excluded from the calculation of diluted earnings per common shares as the effect would have been anti-dilutive.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Stock-Based Compensation	Stock-Based Compensation 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. For retirement eligible colleagues, 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 three months of 2017 and full year 2016 . 2017 2016 Dividend yield 2.00 % 2.50 % Risk-free interest rate 2.00 % 2.00 % Weighted average expected volatility 25.00 % 25.00 % Weighted average expected life 5.5 years 5.5 years Weighted average per share fair value of options $5.30 $3.36 A summary of the Corporation’s stock option activity for the three months ended March 31, 2017 is presented below. Stock Options Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (000s) Outstanding at December 31, 2016 6,357,843 $ 17.67 6.10 $ 47,902 Granted 799,558 $ 25.61 Exercised (1,038,549 ) 16.28 Forfeited or expired (432,001 ) 33.74 Outstanding at March 31, 2017 5,686,851 $ 18.07 7.00 $ 37,180 Options Exercisable at March 31, 2017 3,153,070 $ 16.47 5.59 $ 25,258 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 three months ended March 31, 2017 , the intrinsic value of stock options exercised was approximately $10 million . For the three months ended March 31, 2016, the intrinsic value of the stock options exercised was $420,000 . The total fair value of stock options vested was $3 million for both the three months ended March 31, 2017 and March 31, 2016 . The Corporation recognized compensation expense for the vesting of stock options of $1 million for both the three months ended March 31, 2017 and March 31, 2016. Included in compensation expense for 2017 was approximately $450,000 of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At March 31, 2017 , the Corporation had $7 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 the fourth quarter 2020 . The following table summarizes information about the Corporation’s restricted stock activity for the three months ended March 31, 2017 . Restricted Stock Shares Weighted Average Grant Date Fair Value Outstanding at December 31, 2016 2,377,380 $ 17.40 Granted 729,135 25.59 Vested (788,033 ) 17.87 Forfeited (52,838 ) 17.92 Outstanding at March 31, 2017 2,265,644 $ 19.86 The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant. Performance-based restricted stock awards granted during 2016 and 2017 will vest ratably over a three year period, while service-based restricted stock awards granted during 2016 and 2017 will vest ratably over a four year period. Expense for restricted stock awards of approximately $7 million were recorded for both the three months ended March 31, 2017 and March 31, 2016. Included in compensation expense for 2017 was approximately $2 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $30 million of unrecognized compensation costs related to restricted stock awards at March 31, 2017 , that is expected to be recognized over the remaining requisite service periods that extend predominantly through the fourth quarter 2020 . 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 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	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are generally classified as available for sale or held to maturity at the time of purchase. The majority of the Corporation's investment securities are mortgage-related securities issued by the Government National Mortgage Association (“GNMA”) or government-sponsored enterprises ("GSE") such as the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). The amortized cost and fair values of securities available for sale and held to maturity were as follows. March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: U. S. Treasury securities $ 1,004 $ 1 $ — $ 1,005 Residential mortgage-related securities: FNMA / FHLMC 575,826 15,710 (1,117 ) 590,419 GNMA 2,063,054 1,837 (25,065 ) 2,039,826 Private-label 1,118 — (16 ) 1,102 GNMA commercial mortgage-related securities 1,696,287 145 (33,095 ) 1,663,337 Other securities (debt and equity) 4,718 94 (11 ) 4,801 Total investment securities available for sale $ 4,342,007 $ 17,787 $ (59,304 ) $ 4,300,490 Investment securities held to maturity: Obligations of state and political subdivisions (municipal securities) $ 1,131,526 $ 7,150 $ (9,479 ) $ 1,129,197 Residential mortgage-related securities: FNMA / FHLMC 38,829 403 (727 ) 38,505 GNMA 88,256 146 (762 ) 87,640 GNMA commercial mortgage-related securities 296,232 5,005 (6,257 ) 294,980 Total investment securities held to maturity $ 1,554,843 $ 12,704 $ (17,225 ) $ 1,550,322 December 31, 2016 Amortized Gross Gross Fair Value ($ in Thousands) Investment securities available for sale: U. S. Treasury securities $ 1,000 $ — $ — $ 1,000 Residential mortgage-related securities: FNMA / FHLMC 625,234 17,298 (2,602 ) 639,930 GNMA 2,028,301 1,372 (25,198 ) 2,004,475 Private-label 1,134 1 (14 ) 1,121 GNMA commercial mortgage-related securities 2,064,508 356 (35,966 ) 2,028,898 Other securities (debt and equity) 4,718 105 (21 ) 4,802 Total investment securities available for sale $ 4,724,895 $ 19,132 $ (63,801 ) $ 4,680,226 Investment securities held to maturity: Municipal securities $ 1,145,843 $ 3,868 $ (12,036 ) $ 1,137,675 Residential mortgage-related securities: FNMA / FHLMC 37,697 439 (693 ) 37,443 GNMA 89,996 216 (656 ) 89,556 Total investment securities held to maturity $ 1,273,536 $ 4,523 $ (13,385 ) $ 1,264,674 The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2017 , 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 $ 3,500 $ 3,489 $ 41,148 $ 32,101 Due after one year through five years 2,204 2,205 252,007 259,468 Due after five years through ten years — — 248,861 250,081 Due after ten years — — 589,510 587,547 Total debt securities 5,704 5,694 1,131,526 1,129,197 Residential mortgage-related securities: FNMA / FHLMC 575,826 590,419 38,829 38,505 GNMA 2,063,054 2,039,826 88,256 87,640 Private-label 1,118 1,102 — — GNMA commercial mortgage-related securities 1,696,287 1,663,337 296,232 294,980 Equity securities 18 112 — — Total investment securities $ 4,342,007 $ 4,300,490 $ 1,554,843 $ 1,550,322 Ratio of Fair Value to Amortized Cost 99.0 % 99.7 % During the first quarter of 2017 , the Corporation reclassified approximately $300 million of GNMA commercial mortgage-related securities from available for sale to held to maturity. The reclassification of these investment securities was accounted for at fair value. Management elected to transfer these investment securities as the Corporation has the positive intent and ability to hold these investment securities to maturity. Management expects to continue transferring investment securities from available for sale to held to maturity throughout 2017. Three Months Ended March 31, 2017 2016 ($ in Thousands) Gross gains $ — $ 3,287 Gross losses — (189 ) Investment securities gains, net $ — $ 3,098 Proceeds from sales of investment securities $ — $ 119,379 Investment securities with a carrying value of approximately $2.1 billion and $1.8 billion at March 31, 2017 , and December 31, 2016 , respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law. The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2017 . Less than 12 months 12 months or more Total March 31, 2017 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: Residential mortgage-related securities: FNMA / FHLMC 13 $ (1,117 ) $ 216,103 — $ — $ — $ (1,117 ) $ 216,103 GNMA 56 (25,065 ) 1,638,688 — — — (25,065 ) 1,638,688 Private-label — — — 1 (16 ) 1,100 (16 ) 1,100 GNMA commercial mortgage-related securities 73 (15,538 ) 1,214,494 19 (17,557 ) 368,724 (33,095 ) 1,583,218 Other securities (debt and equity) 3 (11 ) 1,489 — — — (11 ) 1,489 Total 145 $ (41,731 ) $ 3,070,774 20 $ (17,573 ) $ 369,824 $ (59,304 ) $ 3,440,598 Investment securities held to maturity: Municipal securities 538 $ (9,407 ) $ 342,534 4 $ (72 ) $ 1,778 $ (9,479 ) $ 344,312 Residential mortgage-related securities: FNMA / FHLMC 16 (480 ) 19,969 1 (247 ) 5,785 (727 ) 25,754 GNMA 38 (762 ) 62,494 — — — (762 ) 62,494 GNMA commercial mortgage-related securities 9 (4,369 ) 255,424 2 (1,888 ) 39,556 (6,257 ) 294,980 Total 601 $ (15,018 ) $ 680,421 7 $ (2,207 ) $ 47,119 $ (17,225 ) $ 727,540 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, 2016 . Less than 12 months 12 months or more Total December 31, 2016 Number Unrealized Fair Number Unrealized Fair Unrealized Fair ($ in Thousands) Investment securities available for sale: Residential mortgage-related securities: FNMA / FHLMC 14 $ (2,602 ) $ 244,252 — $ — $ — $ (2,602 ) $ 244,252 GNMA 54 (25,198 ) 1,723,523 — — — (25,198 ) 1,723,523 Private-label — — — 1 (14 ) 1,119 (14 ) 1,119 GNMA commercial mortgage-related securities 74 (16,445 ) 1,427,889 21 (19,521 ) 429,258 (35,966 ) 1,857,147 Other securities (debt and equity) 3 (21 ) 1,479 — — — (21 ) 1,479 Total 145 $ (44,266 ) $ 3,397,143 22 $ (19,535 ) $ 430,377 $ (63,801 ) $ 3,827,520 Investment securities held to maturity: Municipal securities 700 $ (11,937 ) $ 414,186 4 $ (99 ) $ 1,752 $ (12,036 ) $ 415,938 Residential mortgage-related securities: FNMA / FHLMC 14 (441 ) 17,477 1 (252 ) 6,031 (693 ) 23,508 GNMA 39 (656 ) 64,633 — — — (656 ) 64,633 Total 753 $ (13,034 ) $ 496,296 5 $ (351 ) $ 7,783 $ (13,385 ) $ 504,079 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. Based on the Corporation’s evaluation, management does not believe any unrealized loss at March 31, 2017 , 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. 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. At March 31, 2017 , and December 31, 2016 , the Corporation had FHLB stock of $64 million and $65 million , respectively. The Corporation had Federal Reserve Bank stock of $75 million at both March 31, 2017 and December 31, 2016 , respectively.

Loans

Loans	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans	Loans The period end loan composition was as follows. March 31, December 31, ($ in Thousands) Commercial and industrial $ 6,300,646 $ 6,489,014 Commercial real estate — owner occupied 878,391 897,724 Commercial and business lending 7,179,037 7,386,738 Commercial real estate — investor 3,415,355 3,574,732 Real estate construction 1,553,205 1,432,497 Commercial real estate lending 4,968,560 5,007,229 Total commercial 12,147,597 12,393,967 Residential mortgage 6,715,282 6,332,327 Home equity 911,969 934,443 Other consumer 372,835 393,979 Total consumer 8,000,086 7,660,749 Total loans $ 20,147,683 $ 20,054,716 The following table presents commercial and consumer loans by credit quality indicator at March 31, 2017 . Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 5,816,591 $ 100,234 $ 218,930 $ 164,891 $ 6,300,646 Commercial real estate - owner occupied 793,177 8,295 58,994 17,925 878,391 Commercial and business lending 6,609,768 108,529 277,924 182,816 7,179,037 Commercial real estate - investor 3,336,105 21,760 49,217 8,273 3,415,355 Real estate construction 1,541,779 38 10,141 1,247 1,553,205 Commercial real estate lending 4,877,884 21,798 59,358 9,520 4,968,560 Total commercial 11,487,652 130,327 337,282 192,336 12,147,597 Residential mortgage 6,658,070 874 2,155 54,183 6,715,282 Home equity 897,452 1,085 220 13,212 911,969 Other consumer 372,064 511 — 260 372,835 Total consumer 7,927,586 2,470 2,375 67,655 8,000,086 Total $ 19,415,238 $ 132,797 $ 339,657 $ 259,991 $ 20,147,683 The following table presents commercial and consumer loans by credit quality indicator at December 31, 2016 . Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 5,937,119 $ 141,328 $ 227,196 $ 183,371 $ 6,489,014 Commercial real estate - owner occupied 805,871 17,785 64,524 9,544 897,724 Commercial and business lending 6,742,990 159,113 291,720 192,915 7,386,738 Commercial real estate - investor 3,491,217 14,236 51,228 18,051 3,574,732 Real estate construction 1,429,083 105 2,465 844 1,432,497 Commercial real estate lending 4,920,300 14,341 53,693 18,895 5,007,229 Total commercial 11,663,290 173,454 345,413 211,810 12,393,967 Residential mortgage 6,275,162 1,314 5,615 50,236 6,332,327 Home equity 919,740 1,588 114 13,001 934,443 Other consumer 393,161 562 — 256 393,979 Total consumer 7,588,063 3,464 5,729 63,493 7,660,749 Total $ 19,251,353 $ 176,918 $ 351,142 $ 275,303 $ 20,054,716 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 nonaccrual are reviewed at a minimum on a quarterly basis, while pass and performing 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 March 31, 2017 . Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Nonaccrual (b) Total ($ in Thousands) Commercial and industrial $ 6,133,822 $ 752 $ 923 $ 258 $ 164,891 $ 6,300,646 Commercial real estate - owner occupied 859,496 500 470 — 17,925 878,391 Commercial and business lending 6,993,318 1,252 1,393 258 182,816 7,179,037 Commercial real estate - investor 3,405,960 920 202 — 8,273 3,415,355 Real estate construction 1,551,527 393 38 — 1,247 1,553,205 Commercial real estate lending 4,957,487 1,313 240 — 9,520 4,968,560 Total commercial 11,950,805 2,565 1,633 258 192,336 12,147,597 Residential mortgage 6,653,856 4,238 3,005 — 54,183 6,715,282 Home equity 894,245 3,406 1,106 — 13,212 911,969 Other consumer 369,455 1,013 645 1,462 260 372,835 Total consumer 7,917,556 8,657 4,756 1,462 67,655 8,000,086 Total $ 19,868,361 $ 11,222 $ 6,389 $ 1,720 $ 259,991 $ 20,147,683 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at March 31, 2017 (the same as the reported balances for the accruing loans noted above). (b) Of the total nonaccrual loans, $194 million or 75% were current with respect to payment at March 31, 2017 . The following table presents loans by past due status at December 31, 2016 . Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Nonaccrual (b) Total ($ in Thousands) Commercial and industrial $ 6,303,994 $ 965 $ 448 $ 236 $ 183,371 $ 6,489,014 Commercial real estate - owner occupied 886,796 968 416 — 9,544 897,724 Commercial and business lending 7,190,790 1,933 864 236 192,915 7,386,738 Commercial real estate - investor 3,555,750 431 500 — 18,051 3,574,732 Real estate construction 1,431,284 264 105 — 844 1,432,497 Commercial real estate lending 4,987,034 695 605 — 18,895 5,007,229 Total commercial 12,177,824 2,628 1,469 236 211,810 12,393,967 Residential mortgage 6,273,949 7,298 844 — 50,236 6,332,327 Home equity 915,593 4,265 1,584 — 13,001 934,443 Other consumer 389,157 2,471 718 1,377 256 393,979 Total consumer 7,578,699 14,034 3,146 1,377 63,493 7,660,749 Total $ 19,756,523 $ 16,662 $ 4,615 $ 1,613 $ 275,303 $ 20,054,716 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2016 (the same as the reported balances for the accruing loans noted above). (b) Of the total nonaccrual loans, $224 million or 81% were current with respect to payment at December 31, 2016 . The following table presents impaired loans at March 31, 2017 . Recorded Unpaid Related Average Interest ($ in Thousands) Loans with a related allowance Commercial and industrial $ 124,408 $ 135,061 $ 26,686 $ 130,361 $ 305 Commercial real estate — owner occupied 14,918 16,833 1,766 15,045 113 Commercial and business lending 139,326 151,894 28,452 145,406 418 Commercial real estate — investor 16,018 16,497 319 16,060 371 Real estate construction 1,349 1,663 533 1,369 32 Commercial real estate lending 17,367 18,160 852 17,429 403 Total commercial 156,693 170,054 29,304 162,835 821 Residential mortgage 66,221 71,013 11,860 66,495 588 Home equity 20,775 22,958 9,528 20,964 250 Other consumer 1,301 1,327 192 1,309 6 Total consumer 88,297 95,298 21,580 88,768 844 Total loans (a) $ 244,990 $ 265,352 $ 50,884 $ 251,603 $ 1,665 Loans with no related allowance Commercial and industrial $ 71,335 $ 75,212 $ — $ 73,314 $ 93 Commercial real estate — owner occupied 8,539 9,409 — 8,582 — Commercial and business lending 79,874 84,621 — 81,896 93 Commercial real estate — investor 6,818 7,219 — 6,853 — Real estate construction 225 225 — 225 — Commercial real estate lending 7,043 7,444 — 7,078 — Total commercial 86,917 92,065 — 88,974 93 Residential mortgage 6,497 7,521 — 6,507 68 Home equity 646 650 — 647 — Other consumer — — — — — Total consumer 7,143 8,171 — 7,154 68 Total loans (a) $ 94,060 $ 100,236 $ — $ 96,128 $ 161 Total Commercial and industrial $ 195,743 $ 210,273 $ 26,686 $ 203,675 $ 398 Commercial real estate — owner occupied 23,457 26,242 1,766 23,627 113 Commercial and business lending 219,200 236,515 28,452 227,302 511 Commercial real estate — investor 22,836 23,716 319 22,913 371 Real estate construction 1,574 1,888 533 1,594 32 Commercial real estate lending 24,410 25,604 852 24,507 403 Total commercial 243,610 262,119 29,304 251,809 914 Residential mortgage 72,718 78,534 11,860 73,002 656 Home equity 21,421 23,608 9,528 21,611 250 Other consumer 1,301 1,327 192 1,309 6 Total consumer 95,440 103,469 21,580 95,922 912 Total loans (a) $ 339,050 $ 365,588 $ 50,884 $ 347,731 $ 1,826 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 79% of the unpaid principal balance at March 31, 2017 . The following table presents impaired loans at December 31, 2016 . Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized ($ in Thousands) Loans with a related allowance Commercial and industrial $ 101,770 $ 107,813 $ 21,617 $ 111,211 $ 2,512 Commercial real estate — owner occupied 6,595 8,641 295 7,111 274 Commercial and business lending 108,365 116,454 21,912 118,322 2,786 Commercial real estate — investor 27,196 27,677 3,541 31,142 2,124 Real estate construction 1,203 1,566 441 1,321 67 Commercial real estate lending 28,399 29,243 3,982 32,463 2,191 Total commercial 136,764 145,697 25,894 150,785 4,977 Residential mortgage 62,362 67,090 11,091 63,825 2,263 Home equity 20,651 22,805 9,312 21,825 1,114 Other consumer 1,235 1,284 186 1,294 29 Total consumer 84,248 91,179 20,589 86,944 3,406 Total loans (a) $ 221,012 $ 236,876 $ 46,483 $ 237,729 $ 8,383 Loans with no related allowance Commercial and industrial $ 113,485 $ 134,863 $ — $ 117,980 $ 1,519 Commercial real estate — owner occupied 8,439 9,266 — 8,759 138 Commercial and business lending 121,924 144,129 — 126,739 1,657 Commercial real estate — investor 6,144 6,478 — 7,092 — Real estate construction — — — — — Commercial real estate lending 6,144 6,478 — 7,092 — Total commercial 128,068 150,607 — 133,831 1,657 Residential mortgage 5,974 6,998 — 6,610 184 Home equity 106 107 — 107 4 Other consumer — — — — — Total consumer 6,080 7,105 — 6,717 188 Total loans (a) $ 134,148 $ 157,712 $ — $ 140,548 $ 1,845 Total Commercial and industrial $ 215,255 $ 242,676 $ 21,617 $ 229,191 $ 4,031 Commercial real estate — owner occupied 15,034 17,907 295 15,870 412 Commercial and business lending 230,289 260,583 21,912 245,061 4,443 Commercial real estate — investor 33,340 34,155 3,541 38,234 2,124 Real estate construction 1,203 1,566 441 1,321 67 Commercial real estate lending 34,543 35,721 3,982 39,555 2,191 Total commercial 264,832 296,304 25,894 284,616 6,634 Residential mortgage 68,336 74,088 11,091 70,435 2,447 Home equity 20,757 22,912 9,312 21,932 1,118 Other consumer 1,235 1,284 186 1,294 29 Total consumer 90,328 98,284 20,589 93,661 3,594 Total loans (a) $ 355,160 $ 394,588 $ 46,483 $ 378,277 $ 10,228 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 78% of the unpaid principal balance at December 31, 2016 . Troubled Debt Restructurings (“Restructured Loans”) Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The Corporation had a recorded investment of approximately $55 million in loans modified in troubled debt restructurings for the three months ended March 31, 2017 , of which approximately $1 million was in accrual status and $54 million was in nonaccrual pending a sustained period of repayment. At March 31, 2017 the commercial and industrial nonaccrual restructured loans increased primarily due to the restructuring of several large oil and gas loans. These loans were included in nonaccrual loans at both March 31, 2017 and December 31, 2016 . The following table presents nonaccrual and performing restructured loans by loan portfolio. March 31, 2017 December 31, 2016 Performing Restructured Loans Nonaccrual Restructured Loans (a) Performing Restructured Loans Nonaccrual Restructured Loans (a) ($ in Thousands) Commercial and industrial $ 30,852 $ 52,079 $ 31,884 $ 1,276 Commercial real estate — owner occupied 5,532 2,148 5,490 2,220 Commercial real estate — investor 14,563 1,643 15,289 924 Real estate construction 327 170 359 150 Residential mortgage 18,535 20,457 18,100 21,906 Home equity 8,209 2,379 7,756 2,877 Other consumer 1,041 26 979 32 Total $ 79,059 $ 78,902 $ 79,857 $ 29,385 (a) Nonaccrual restructured loans have been included within nonaccrual loans. The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three months ended March 31, 2017 and 2016 , respectively, and the recorded investment and unpaid principal balance as of March 31, 2017 and 2016 respectively. Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) ($ in Thousands) Commercial and industrial 20 $ 52,326 $ 60,546 7 $ 1,483 $ 1,522 Commercial real estate — owner occupied 1 204 204 1 125 130 Commercial real estate — investor 1 733 744 — — — Real estate construction — — — 1 10 55 Residential mortgage 16 1,301 1,322 30 2,062 2,124 Home equity 15 347 347 20 818 879 Total 53 $ 54,911 $ 63,163 59 $ 4,498 $ 4,710 (a) Represents post-modification outstanding recorded investment. (b) 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 months ended March 31, 2017 , 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 primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the three months ended March 31, 2017 . The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2017 and 2016 , respectively, as well as the recorded investment in these restructured loans as of March 31, 2017 and 2016 , respectively. Three Months Ended March 31, 2017 Three Month Ended March 31, 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment ($ in Thousands) Real estate construction — $ — 1 $ 10 Residential mortgage 6 383 7 1,151 Home equity 2 26 8 153 Total 8 $ 409 16 $ 1,314 All loans modified in a troubled debt restructuring are evaluated for impairment. The nature and extent of the impairment of restructured loans, including those which have experienced a subsequent payment default, is considered in the determination of an appropriate level of the allowance for loan losses. Allowance for Credit Losses A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 , was as follows. $ in Thousands Commercial and industrial Commercial real estate - owner occupied Commercial real estate - investor Real estate construction Residential mortgage Home equity Other consumer Total December 31, 2016 $ 140,126 $ 14,034 $ 45,285 $ 26,932 $ 27,046 $ 20,364 $ 4,548 $ 278,335 Charge offs (9,359 ) (5 ) (633 ) (23 ) (297 ) (509 ) (1,028 ) (11,854 ) Recoveries 4,991 24 119 34 169 682 172 6,191 Net charge offs (4,368 ) 19 (514 ) 11 (128 ) 173 (856 ) (5,663 ) Provision for loan losses 10,509 (2,841 ) (3,406 ) 1,825 3,370 (223 ) 766 10,000 March 31, 2017 $ 146,267 $ 11,212 $ 41,365 $ 28,768 $ 30,288 $ 20,314 $ 4,458 $ 282,672 Allowance for loan losses: Individually evaluated for impairment $ 25,915 $ 1,541 $ 99 $ — $ 810 $ — $ — $ 28,365 Collectively evaluated for impairment 120,352 9,671 41,266 28,768 29,478 20,314 4,458 254,307 Total allowance for loan losses $ 146,267 $ 11,212 $ 41,365 $ 28,768 $ 30,288 $ 20,314 $ 4,458 $ 282,672 Loans: Individually evaluated for impairment $ 162,788 $ 17,098 $ 7,615 $ 225 $ 11,086 $ 647 $ — $ 199,459 Collectively evaluated for impairment 6,137,858 861,293 3,407,740 1,552,980 6,704,196 911,322 372,835 19,948,224 Total loans $ 6,300,646 $ 878,391 $ 3,415,355 $ 1,553,205 $ 6,715,282 $ 911,969 $ 372,835 $ 20,147,683 The allowance for credit losses is comprised of the allowance for loan losses and the allowance for unfunded commitments. 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. 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. See Note 12 for additional information on the allowance for unfunded commitments. For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2016 , was as follows. $ in Thousands Commercial and industrial Commercial real estate - owner occupied Commercial real estate - investor Real estate construction Residential mortgage Home equity Other consumer Total December 31, 2015 $ 129,959 $ 18,680 $ 43,018 $ 25,266 $ 28,261 $ 23,555 $ 5,525 $ 274,264 Charge offs (71,016 ) (512 ) (1,504 ) (558 ) (4,332 ) (4,686 ) (3,831 ) (86,439 ) Recoveries 14,543 74 1,624 203 755 3,491 820 21,510 Net charge offs (56,473 ) (438 ) 120 (355 ) (3,577 ) (1,195 ) (3,011 ) (64,929 ) Provision for loan losses 66,640 (4,208 ) 2,147 2,021 2,362 (1,996 ) 2,034 69,000 December 31, 2016 $ 140,126 $ 14,034 $ 45,285 $ 26,932 $ 27,046 $ 20,364 $ 4,548 $ 278,335 Allowance for loan losses: Individually evaluated for impairment $ 20,836 $ — $ 3,117 $ — $ 147 $ 3 $ — $ 24,103 Collectively evaluated for impairment 119,290 14,034 42,168 26,932 26,899 20,361 4,548 254,232 Total allowance for loan losses $ 140,126 $ 14,034 $ 45,285 $ 26,932 $ 27,046 $ 20,364 $ 4,548 $ 278,335 Loans: Individually evaluated for impairment $ 180,965 $ 8,439 $ 17,322 $ — $ 7,033 $ 650 $ — $ 214,409 Collectively evaluated for impairment 6,308,049 889,285 3,557,410 1,432,497 6,325,294 933,793 393,979 19,840,307 Total loans $ 6,489,014 $ 897,724 $ 3,574,732 $ 1,432,497 $ 6,332,327 $ 934,443 $ 393,979 $ 20,054,716 A summary of the changes in the allowance for unfunded commitments was as follows. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Allowance for Unfunded Commitments: Balance at beginning of period $ 25,400 $ 24,400 Provision for unfunded commitments (1,000 ) 1,000 Balance at end of period $ 24,400 $ 25,400

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and 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 Corporation conducted its most recent annual impairment testing in May 2016, 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 changes in both the Corporation’s common stock price and in the overall bank common stock index (based on 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 2016 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 May 2016 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2016 or the first three months of 2017 . At both March 31, 2017 and December 31, 2016 , the Corporation had goodwill of $972 million . Goodwill increased minimally by approximately $55,000 during the first quarter of 2017 as a result of a small insurance acquisition. See Note 2 for additional information on the Corporation's acquisitions. 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. During the first quarter of 2017, the Corporation added approximately $162,000 of other intangibles relating to customer relationships associated with one small insurance acquisition. See Note 2 for additional information on the Corporation's acquisitions. For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Core deposit intangibles: Gross carrying amount $ 4,385 $ 4,385 Accumulated amortization (4,340 ) (4,273 ) Net book value $ 45 $ 112 Amortization during the year $ 67 $ 281 Other intangibles: Gross carrying amount $ 32,572 $ 32,410 Accumulated amortization (17,591 ) (17,145 ) Net book value $ 14,981 $ 15,265 Additions during the period $ 162 $ 1,012 Amortization during the year $ 446 $ 1,812 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 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 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. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Mortgage servicing rights Mortgage servicing rights at beginning of period $ 62,085 $ 62,150 Additions 1,920 12,262 Amortization (2,477 ) (12,327 ) Mortgage servicing rights at end of period $ 61,528 $ 62,085 Valuation allowance at beginning of period (609 ) (809 ) (Additions) recoveries, net (217 ) 200 Valuation allowance at end of period (826 ) (609 ) Mortgage servicing rights, net $ 60,702 $ 61,476 Fair value of mortgage servicing rights $ 68,037 $ 73,149 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,908,799 $ 7,974,742 Mortgage servicing rights, net to servicing portfolio 0.77 % 0.77 % Mortgage servicing rights expense (a) $ 2,694 $ 12,127 (a) 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 March 31, 2017 . 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) Nine months ending December 31, 2017 $ 45 $ 1,351 $ 7,275 2018 — 1,771 8,389 2019 — 1,472 7,100 2020 — 1,355 6,025 2021 — 1,331 5,128 2022 — 1,308 4,385 Beyond 2022 — 6,393 23,226 Total Estimated Amortization Expense $ 45 $ 14,981 $ 61,528

Short and Long-Term Funding

Short and Long-Term Funding	3 Months Ended
	Mar. 31, 2017
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. March 31, 2017 December 31, 2016 ($ in Thousands) Short-Term Funding Federal funds purchased $ 323,365 $ 208,150 Securities sold under agreements to repurchase 326,823 300,197 Federal funds purchased and securities sold under agreements to repurchase $ 650,188 $ 508,347 FHLB advances 309,000 482,000 Commercial paper 121,679 101,688 Other short-term funding 430,679 583,688 Total short-term funding $ 1,080,867 $ 1,092,035 Long-Term Funding FHLB advances $ 2,265,180 $ 2,265,188 Senior notes, at par 250,000 250,000 Subordinated notes, at par 250,000 250,000 Other long-term funding and capitalized costs (3,225 ) (3,393 ) Total long-term funding 2,761,955 2,761,795 Total short and long-term funding $ 3,842,822 $ 3,853,830 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 11 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 March 31, 2017 , the Corporation pledged agency mortgage-related securities with a fair value of $481 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of March 31, 2017 and December 31, 2016 are presented in the following table. Remaining Contractual Maturity of the Agreements March 31, 2017 Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total ($ in Thousands) Repurchase agreements Agency mortgage-related securities $ 326,823 $ — $ — $ — $ 326,823 Total $ 326,823 $ — $ — $ — $ 326,823 December 31, 2016 Repurchase agreements Agency mortgage-related securities $ 300,197 $ — $ — $ — $ 300,197 Total $ 300,197 $ — $ — $ — $ 300,197 Long-Term Funding FHLB advances: At March 31, 2017 , the long-term FHLB advances had a weighted average interest rate of 0.68% , compared to 0.50% at December 31, 2016 . The majority of FHLB advances are indexed to the FHLB discount note and re-price at varying intervals. The advances offer flexible, low cost, long-term funding that improves the Corporation’s liquidity profile. 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. 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.

Derivative and Hedging Activiti

Derivative and Hedging Activities	3 Months Ended
	Mar. 31, 2017
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, commodity hedging, and foreign currency exchange solutions through its capital markets area. To date, all of the notional amounts of customer transactions have been matched with a mirror hedge with another counterparty. The Corporation has used, and may use again 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, commodity contracts, 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 and commodity-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 $25 million of investment securities as collateral at March 31, 2017 , and pledged $40 million of investment securities as collateral at December 31, 2016 . Federal regulations require the Corporation to 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 March 31, 2017 and December 31, 2016 the Corporation posted no cash collateral for the margin. Derivatives to Accommodate Customer Needs The Corporation enters into various derivative contracts which are designated as free standing derivative contracts. Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk, foreign currency, and commodity prices. 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), foreign currency exchange forwards, and commodity contracts. See Note 11 for additional information and disclosures on balance sheet offsetting. Interest rate-related instruments: The Corporation provides interest rate risk management services to commercial customers, primarily forward interest rate swaps and caps. 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. Foreign currency exchange forwards: 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. Commodity contracts: Commodity contracts are entered into primarily for the benefit of commercial customers seeking to manage their exposure to fluctuating commodity prices. The Corporation mitigates its risk by then entering into an offsetting commodity derivative contract. The table below identifies the balance sheet category and fair values of the Corporation’s free standing derivative instruments, which are not designated as hedging instruments. March 31, 2017 December 31, 2016 ($ in Thousands) Notional Amount Fair Value Balance Sheet Category Notional Amount Fair Balance Sheet Interest rate-related instruments — customer and mirror $ 2,098,658 $ 31,841 Trading assets $ 2,039,323 $ 33,671 Trading assets Interest rate-related instruments — customer and mirror 2,098,658 (31,113 ) Trading liabilities 2,039,323 (33,188 ) Trading liabilities Foreign currency exchange forwards 83,012 812 Trading assets 109,675 2,002 Trading assets Foreign currency exchange forwards 80,227 (774 ) Trading liabilities 106,251 (1,943 ) Trading liabilities Commodity contracts 301,425 16,653 Trading assets 127,582 16,725 Trading assets Commodity contracts 300,011 (15,674 ) Trading liabilities 128,368 (15,972 ) Trading liabilities 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. Written and Purchased Options (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. The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments which are not designated as hedging instruments. March 31, 2017 December 31, 2016 ($ in Thousands) Notional Amount Fair Balance Sheet Notional Amount Fair Balance Sheet Interest rate lock commitments (mortgage) 291,674 1,803 Other assets 285,345 206 Other assets Forward commitments (mortgage) 100,750 (373 ) Other liabil ities 179,600 2,908 Other assets Purchased options (time deposit) 80,116 2,290 Other assets 80,554 2,576 Other assets Written options (time deposit) 80,116 (2,290 ) Other liabilities 80,554 (2,576 ) Other liabilities 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 For the Three Months Ended March 31, ($ in Thousands) 2017 2016 Derivative Instruments: Interest rate-related instruments — customer and mirror, net Capital market fees, net $ 245 $ (870 ) Interest rate lock commitments (mortgage) Mortgage banking, net 1,597 1,731 Forward commitments (mortgage) Mortgage banking, net (3,281 ) (2,135 ) Foreign currency exchange forwards Capital market fees, net (21 ) (28 ) Commodity contracts Capital market fees, net 226 —

Balance Sheet Offsetting

Balance Sheet Offsetting	3 Months Ended
	Mar. 31, 2017
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate-Related Instruments and Commodity Contracts (“Interest and Commodity Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation also enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices. The Corporation mitigates these risks by entering into equal and offsetting interest and commodity agreements with highly rated third party financial institutions. The Corporation is party to master netting arrangements with its financial institution counterparties that creates a single net settlement of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest and commodity agreements. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. The Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. See Note 10 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. The interest and commodity 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 not offset in the balance sheet Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Collateral Net amount ($ in Thousands) March 31, 2017 Derivative assets: Interest and commodity agreements $ 23,374 $ — $ 23,374 $ (19,022 ) $ (4,352 ) $ — Derivative liabilities: Interest and commodity agreements $ 19,022 $ — $ 19,022 $ (19,022 ) $ — $ — December 31, 2016 Derivative assets: Interest and commodity agreements $ 18,031 $ — $ 18,031 $ (18,031 ) $ — $ — Derivative liabilities: Interest and commodity agreements $ 31,075 $ — $ 31,075 $ (18,031 ) $ (11,148 ) $ 1,896

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings	Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings 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) as well as derivative instruments (see Note 10 ). The following is a summary of lending-related commitments. March 31, 2017 December 31, 2016 ($ in Thousands) Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 8,041,839 $ 8,131,131 Commercial letters of credit (a) 7,490 7,923 Standby letters of credit (c) 268,612 259,632 (a) 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 March 31, 2017 or December 31, 2016 . (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10 . (c) The Corporation has established a liability of $3 million at both March 31, 2017 and December 31, 2016 , 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 March 31, 2017 compared to $25 million at December 31, 2016 , and is included in accrued expenses and other liabilities on the consolidated balance sheets. 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 10 . 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 unconsolidated projects including low-income housing, new market tax credit projects, and historic tax credit projects to promote the revitalization of primarily 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 March 31, 2017 , was $111 million , compared to $85 million at December 31, 2016 , included in other assets on the consolidated balance sheets. Related to these investments, the Corporation had remaining commitments to fund of $80 million at March 31, 2017 , and $69 million at December 31, 2016 . Legal Proceedings 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 currently 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 (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. On January 31, 2017, the District Court granted the Bank’s motion for summary judgment. The receiver has appealed the District Court’s summary judgment decision to the Eighth Circuit Court of Appeals. 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 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. Two complaints were filed against the Bank on January 11, 2016 in the United States Bankruptcy Court for the Northern District of Illinois, Eastern Division in connection with the In re: World Marketing Chicago, LLC, et al Chapter 11 bankruptcy proceeding. In the first complaint, The Official Committee of Unsecured Creditors of World Marketing Chicago, LLC, et al v. Associated Bank, N.A., the plaintiff seeks to avoid guarantees and pledges of collateral given by the debtors to secure a revolving financing commitment of $6 million to the debtors’ parent company from the Bank. The plaintiff alleges a variety of legal theories under federal and state law, including fraudulent conveyance, preferential transfer and conversion, in support of its position. The plaintiff seeks return of approximately $4 million paid to the Bank and the avoidance of the security interest in the collateral securing the remaining indebtedness to the Bank. The Bank intends to vigorously defend this lawsuit. In the second complaint, American Funds Service Company v. Associated Bank, N.A., the plaintiff alleges that approximately $600,000 of funds it had advanced to the World Marketing entities to apply towards future postage fees was swept by the Bank from World Marketing’s bank accounts. Plaintiff seeks the return of such funds from the Bank under several theories, including Sec. 541(d) of the Bankruptcy Code, the creation of a resulting trust, and unjust enrichment. The Bank intends to vigorously defend this lawsuit. 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 with respect to these two lawsuits. 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 $112,000 and $2 million during the three months ended March 31, 2017 and the year ended December 31, 2016 , respectively. The loss reimbursement and settlement claims paid for the three months ended March 31, 2017 and the year ended December 31, 2016 , respectively were negligible. Make whole requests during 2016 and the first three months of 2017 generally arose from loans sold during the period of January 1, 2012 to March 31, 2017 , which total $9.4 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2017 , approximately $6.1 billion of these sold loans remain outstanding. The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The following summarizes the changes in the mortgage repurchase reserve. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Balance at beginning of period $ 900 $ 1,197 Repurchase provision expense 59 456 Adjustments to provision expense — (750 ) Charge offs, net — (3 ) Balance at end of period $ 959 $ 900 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 March 31, 2017 , and December 31, 2016 , there were approximately $45 million and $62 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 March 31, 2017 and December 31, 2016 , there were $92 million and $98 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	3 Months Ended
	Mar. 31, 2017
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. Assets and Liabilities Measured at Fair Value on a Recurring Basis 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. 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. 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. Residential loans held for sale: Loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are now carried at estimated fair value. Effective January 1, 2017, management elected the fair value option to account for all newly originated mortgage loans held for sale which results in the financial impact of changing market conditions being reflected currently in earnings as opposed to being dependent upon the timing of sales. Therefore, the continually adjusted values going forward will better reflect the price the Corporation expects to receive from the sale of such loans. 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 fair value measurement. Derivative financial instruments (interest rate-related instruments): The Corporation has used, and may use again in the future, interest rate swaps to manage its interest rate risk. In addition, the Corporation offers 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 10 for additional disclosure regarding the Corporation’s interest rate-related instruments. The discounted cash flow analysis component in the fair value measurements 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. 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 March 31, 2017 , and December 31, 2016 , 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 10 for additional disclosures regarding the Corporation’s foreign currency exchange forwards. Derivative financial instruments (commodity contracts): The Corporation enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror commodity contracts) with third parties to manage its risk associated with these financial instruments. The valuation of the Corporation’s commodity contracts is determined using quoted prices of the underlying instrument, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s commodity contracts. The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 , aggregated by the level in the fair value hierarchy within which those measurements fall. Fair Value Hierarchy March 31, 2017 December 31, 2016 ($ in Thousands) Assets: Investment securities available for sale: U.S. Treasury securities Level 1 $ 1,005 $ 1,000 Residential mortgage-related securities: FNMA / FHLMC Level 2 590,419 639,930 GNMA Level 2 2,039,826 2,004,475 Private-label Level 2 1,102 1,121 GNMA commercial mortgage-related securities Level 2 1,663,337 2,028,898 Other securities (debt and equity) Level 1 1,601 1,602 Other securities (debt and equity) Level 2 3,200 3,000 Other securities (debt and equity) Level 3 — 200 Total investment securities available for sale Level 1 2,606 2,602 Total investment securities available for sale Level 2 4,297,884 4,677,424 Total investment securities available for sale Level 3 — 200 Residential loans held for sale (a) Level 2 34,051 — Interest rate-related instruments Level 2 31,841 33,671 Foreign currency exchange forwards Level 2 812 2,002 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 1,803 206 Forward commitments to sell residential mortgage loans Level 3 — 2,908 Commodity contracts Level 2 16,653 16,725 Purchased options (time deposit) Level 2 2,290 2,576 Liabilities: Interest rate-related instruments Level 2 $ 31,113 $ 33,188 Foreign currency exchange forwards Level 2 774 1,943 Forward commitments to sell residential mortgage loans Level 3 373 — Commodity contracts Level 2 15,674 15,972 Written options (time deposit) Level 2 2,290 2,576 (a) Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements. The table below presents a rollforward of the balance sheet amounts for the three months ended March 31, 2017 and the year ended December 31, 2016 , 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, 2015 $ 200 $ 1,361 Total net gains included in income: Mortgage derivative gain — 1,753 Balance December 31, 2016 $ 200 $ 3,114 Total net losses included in income: Mortgage derivative loss — (1,684 ) Transfer out of level 3 securities (a) (200 ) — Balance March 31, 2017 $ — $ 1,430 (a) During the first quarter of 2017, the $200,000 level 3 investment security was transferred to level 2 based upon new pricing information. For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2017 , 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 fair value is determined by the change in value from each loan’s rate lock date to the expected rate lock expiration date based on the underlying loan attributes, estimated closing ratios, and investor price matrix determined to be reasonably applicable to each loan commitment. The closing ratio calculation takes into consideration historical experience and loan-level attributes, 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 Associated Mortgage Risk Management Committee. At March 31, 2017 , the closing ratio was 90% . Derivative financial instruments (mortgage derivative—forward commitments to sell mortgage loans): Mortgage derivatives include forward commitments do deliver closed end residential mortgage loans into conforming Agency Mortgage Backed Securities (To be Announced, "TBA") or conforming Cash Forward sales. The fair value of such instruments is determined by the difference of current market prices for such traded instruments or available from forward cash delivery commitments and the original traded price for such commitments. 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 10 for additional disclosure regarding the Corporation’s mortgage derivatives. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis 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. Commercial loans held for sale: Loans held for sale 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. Other real estate owned: 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. For Level 3, assets and liabilities measured at fair value on a nonrecurring basis as of March 31, 2017 , the Corporation utilized the following valuation techniques and significant unobservable inputs. 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. 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 an average discount of approximately 20% or less. See Note 7 Loans 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. 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 10.9% and 10.6% at March 31, 2017 , 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 Treasury and the Community, Consumer, and Business segment to reconcile the fair value estimates and the key assumptions used by the respective parties in arriving at those estimates. The Associated 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. See Note 8 for additional disclosure regarding the Corporation’s mortgage servicing rights. The table below presents the Corporation’s loans held for sale, impaired loans, and mortgage servicing rights measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall. Income Statement Category of Adjustment Recognized in Income ($ in Thousands) Fair Value Hierarchy Fair Value March 31, 2017 Assets: Commercial loans held for sale (a) Level 2 $ 2,901 Provision for credit losses $ — Impaired loans (c) Level 3 93,552 Provision for credit losses (25,785 ) Other real estate owned Level 2 921 Foreclosure / OREO expense, net (583 ) Mortgage servicing rights Level 3 68,037 Mortgage banking, net (217 ) December 31, 2016 Assets: Commercial loans held for sale Level 2 $ 12,474 Provision for credit losses $ (559 ) Residential loans held for sale (b) Level 2 108,010 Mortgage banking, net (3,760 ) Impaired loans (c) Level 3 79,270 Provision for credit losses (75,194 ) Other real estate owned Level 2 9,752 Foreclosure / OREO expense, net (1,091 ) Mortgage servicing rights Level 3 73,149 Mortgage banking, net 200 (a) Commercial loans held for sale are carried at the lower of cost or estimated fair value. At March 31, 2017 , the estimated fair value exceeded the cost and therefore there was no adjustment recognized in Income. (b) Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements. (c) Represents individually evaluated impaired loans, net of the related allowance for loan losses. Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a nonrecurring basis include the fair value analysis 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. Fair Value of Financial Instruments The Corporation is required to disclose estimated fair values for its financial instruments. Fair value estimates, methods, and assumptions are set forth below for the Corporation’s financial instruments. March 31, 2017 December 31, 2016 Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value ($ in Thousands) Financial assets: Cash and due from banks Level 1 $ 332,601 $ 332,601 $ 446,558 $ 446,558 Interest-bearing deposits in other financial institutions Level 1 337,167 337,167 149,175 149,175 Federal funds sold and securities purchased under agreements to resell Level 1 19,700 19,700 46,500 46,500 Investment securities held to maturity Level 2 1,554,843 1,550,322 1,273,536 1,264,674 Investment securities available for sale Level 1 2,606 2,606 2,602 2,602 Investment securities available for sale Level 2 4,297,884 4,297,884 4,677,424 4,677,424 Investment securities available for sale Level 3 — — 200 200 FHLB and Federal Reserve Bank stocks Level 2 139,273 139,273 140,001 140,001 Commercial loans held for sale Level 2 2,901 2,901 12,474 12,474 Residential loans held for sale Level 2 34,051 34,051 108,010 108,010 Loans, net Level 3 19,865,011 19,752,810 19,776,381 19,680,317 Bank owned life insurance Level 2 587,600 587,600 585,290 585,290 Derivatives (trading and other assets) Level 2 51,596 51,596 54,974 54,974 Derivatives (trading and other assets) Level 3 1,803 1,803 3,114 3,114 Financial liabilities: Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 20,213,126 $ 20,213,126 $ 20,282,321 $ 20,282,321 Brokered CDs and other time deposits Level 2 1,614,909 1,614,909 1,606,127 1,606,127 Short-term funding Level 2 1,080,867 1,080,867 1,092,035 1,092,035 Long-term funding Level 2 2,761,955 2,790,093 2,761,795 2,791,841 Standby letters of credit (a) Level 2 2,648 2,648 2,566 2,566 Derivatives (trading and other liabilities) Level 2 49,851 49,851 53,679 53,679 Derivatives (trading and other liabilities) Level 3 373 373 — — (a) The commitment on standby letters of credit was $269 million and $260 million at March 31, 2017 and December 31, 2016 , respectively. See Note 12 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, and federal funds sold and securities purchased under agreements to resell: 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. The estimated fair value for residential loans held for sale was based on what secondary markets are currently offering for portfolios with similar characteristics. The estimated fair value for commercial loans held for sale was based on a discounted cash flow analysis. 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), residential mortgage, home equity, and other consumer. 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 ("BOLI"): The fair value of BOLI 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, savings, interest-bearing demand, and money market accounts, 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. Short-term funding: The carrying amount is a reasonable estimate of fair value for existing short-term funding. 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. Standby letters of credit: The fair value of standby letters of credit represents 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. Derivatives (trading and other): A detailed description of the Corporation's derivative instruments can be found under the "Assets and Liabilities Measured at Fair Value on a Recurring Basis" section of this footnote. Limitations: Fair value estimates are made at a specific point in time, based on relevant market information and 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	3 Months Ended
	Mar. 31, 2017
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. The Corporation also provides legacy healthcare access to a limited group of retired employees from a previous acquisition in the Postretirement Plan. There are no other active retiree healthcare plans. The components of net periodic benefit cost for the RAP and Postretirement Plans for three months ended March 31, 2017 and 2016 were as follows. Three Months Ended March 31, 2017 2016 ($ in Thousands) Components of Net Periodic Benefit Cost Pension Plan: Service cost $ 1,781 $ 1,725 Interest cost 1,756 1,780 Expected return on plan assets (4,881 ) (5,065 ) Amortization of prior service cost (19 ) 13 Amortization of actuarial loss 488 482 Total net pension cost $ (875 ) $ (1,065 ) Postretirement Plan: Interest cost $ 24 $ 36 Amortization of prior service cost (19 ) — Total net periodic benefit cost $ 5 $ 36

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2017
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. The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation’s 2016 Annual Report on Form 10-K, with certain exceptions. The more significant of these exceptions are described herein. The Corporation allocates net interest income using an internal funds transfer pricing ("FTP") methodology that charges users of funds (assets) and credits providers of funds (liabilities, primarily deposits) 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 based on an incurred loss model using the methodologies described in the Corporation’s 2016 Annual Report on Form 10-K to assess the overall appropriateness of the allowance for loan 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. A brief description of each business segment is presented below. A more in-depth discussion of these segments can be found in the Segment Reporting footnote in the Corporation’s 2016 Annual Report on Form 10-K. The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, not-for-profits, municipalities, and financial institutions. The Community, Consumer, and Business segment serves individuals, as well as small and mid-sized businesses. The Risk Management and Shared Services segment includes key shared operational functions and also includes residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (FTP mismatches) and credit risk and provision residuals (long-term credit charge mismatches). 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 Three Months Ended March 31, 2017 Net interest income $ 89,388 $ 88,928 $ 1,958 $ 180,274 Noninterest income 11,993 64,870 2,968 79,831 Total revenue 101,381 153,798 4,926 260,105 Credit provision* 11,580 4,507 (7,087 ) 9,000 Noninterest expense 37,479 116,097 20,115 173,691 Income (loss) before income taxes 52,322 33,194 (8,102 ) 77,414 Income tax expense (benefit) 17,649 11,618 (8,123 ) 21,144 Net income $ 34,673 $ 21,576 $ 21 $ 56,270 Return on average allocated capital (ROCET1)** 12.6 % 15.2 % (2.5 )% 10.6 % Three Months Ended March 31, 2016 Net interest income $ 79,164 $ 85,605 $ 7,218 $ 171,987 Noninterest income 11,613 63,748 7,831 83,192 Total revenue 90,777 149,353 15,049 255,179 Credit provision* 12,739 6,142 1,119 20,000 Noninterest expense 34,403 121,295 18,273 173,971 Income (loss) before income taxes 43,635 21,916 (4,343 ) 61,208 Income tax expense (benefit) 14,579 7,670 (3,575 ) 18,674 Net income (loss) $ 29,056 $ 14,246 $ (768 ) $ 42,534 Return on average allocated capital (ROCET1)** 11.3 % 9.1 % (5.0 )% 8.6 % Segment Balance Sheet Data ($ in Thousands) Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Three Months Ended March 31, 2017 Average earning assets $ 10,759,811 $ 9,130,457 $ 6,449,046 $ 26,339,314 Average loans 10,753,314 9,128,656 190,755 20,072,725 Average deposits 6,420,401 11,337,064 3,708,257 21,465,722 Average allocated capital (CET1)** $ 1,114,610 $ 576,464 $ 370,675 $ 2,061,749 Three Months Ended March 31, 2016 Average earning assets $ 9,720,028 $ 9,120,319 $ 6,432,026 $ 25,272,373 Average loans 9,711,221 9,119,020 92,589 18,922,830 Average deposits 5,918,341 11,100,195 3,556,638 20,575,174 Average allocated capital (CET1)** $ 1,031,659 $ 627,211 $ 237,611 $ 1,896,481 * 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 common equity Tier 1. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1. 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)	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 and 2016 , changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three month periods ended March 31, 2017 and 2016 , respectively. ($ in Thousands) Investments Securities Available For Sale Defined Benefit Pension and Post Retirement Obligations Accumulated Other Comprehensive Income (Loss) Balance January 1, 2017 $ (20,079 ) $ (34,600 ) $ (54,679 ) Other comprehensive loss before reclassifications (2,112 ) — (2,112 ) Amounts reclassified from accumulated other comprehensive income (loss): Personnel expense — 450 450 Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities) (1,027 ) — (1,027 ) Income tax (expense) benefit 1,195 (171 ) 1,024 Net other comprehensive income during period (1,944 ) 279 (1,665 ) Balance March 31, 2017 $ (22,023 ) $ (34,321 ) $ (56,344 ) Balance January 1, 2016 $ 459 $ (33,075 ) $ (32,616 ) Other comprehensive income before reclassifications 60,422 — 60,422 Amounts reclassified from accumulated other comprehensive income (loss): Investment securities gain, net (3,098 ) — (3,098 ) Personnel expense — 495 495 Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities) (1,572 ) — (1,572 ) Income tax expense (21,275 ) (189 ) (21,464 ) Net other comprehensive income during period 34,477 306 34,783 Balance March 31, 2016 $ 34,936 $ (32,769 ) $ 2,167

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block]	Accounting Policy Elections Effective January 1, 2017, residential mortgage loans that are classified as held for sale are accounted using the fair value option method of accounting. The Corporation has elected the fair value option to mitigate accounting mismatches between held for sale loan valuations and corresponding derivative commitments. Prior to January 1, 2017, residential mortgage loans that were classified as held for sale were accounted for at the lower of cost or market method (“LOCOM”) of accounting.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2017-08 Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities The amendments of the new standard require that certain purchased callable debt securities held at a premium be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. 1st Quarter 2017 The Corporation early adopted with no material impact on results of operations, financial position, or liquidity. ASU 2017-03 Accounting Changes and Error Corrections (Topic 250) and Investments - Equity Method and Joint Ventures (Topic 323) The standard states that ASUs which have not been adopted yet, the registrant needs to determine the potential effects (if material) of those ASUs on the financial statements when adopted and include the appropriate disclosures in the financial statements. If the impact of adoption is unknown or cannot be estimated, the registrant should include a statement noting this and consider adding qualitative disclosures to the financial statements to assist the reader in evaluating the impact of the ASUs, when adopted, on the financial statements. 1st Quarter 2017 No material impact on results of operations, financial position, or liquidity. ASU 2016-17 Consolidation (Topic 810): Interests Held through Related Parties That Are under Common Control The FASB issued an amendment to address how a reporting entity that is a single decision maker of a variable interest entity treats indirect interests in the entity held through related parties that are under common control with the reporting entity. 1st Quarter 2017 No material impact on results of operations, financial position, or liquidity. ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting The FASB issued an amendment involving several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. Entities should apply the amendment related to the timing of when excess tax benefits are recognized, minimum statutory withholding requirements, forfeitures, and intrinsic value using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is adopted. Entities should apply the amendment related to the presentation of employee taxes paid on the statement of cash flows when an employer withholds shares to meet the minimum statutory withholding requirement retrospectively. The amendment requiring recognition of excess tax benefits and tax deficiencies in the income statement and the practical expedient for estimating expected term should be applied prospectively. 4th Quarter 2016 The Corporation early adopted the accounting standard and recognized a $1 million reduction in income taxes for the excess tax benefits on stock-based compensation. The remaining provisions of this accounting standard did not have a material impact. ASU 2016-07 Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting The FASB issued an amendment to eliminate the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The amendments require that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. Entities should apply the amendment prospectively to increases in the level of ownership interest or degree of influence that result in the adoption of the equity method. 1st Quarter 2017 No material impact on results of operations, financial position, or liquidity.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Calculations for basic and diluted earnings per common share	Presented below are the calculations for basic and diluted earnings per common share. For the Three Months Ended March 31, 2017 2016 (In thousands, except per share data) Net income $ 56,270 $ 42,534 Preferred stock dividends (2,330 ) (2,198 ) Net income available to common equity $ 53,940 $ 40,336 Common shareholder dividends (18,251 ) (16,203 ) Unvested share-based payment awards (117 ) (206 ) Undistributed earnings $ 35,572 $ 23,927 Undistributed earnings allocated to common shareholders 35,294 23,686 Undistributed earnings allocated to unvested share-based payment awards 278 241 Undistributed earnings $ 35,572 $ 23,927 Basic Distributed earnings to common shareholders $ 18,251 $ 16,203 Undistributed earnings allocated to common shareholders 35,294 23,686 Total common shareholders earnings, basic $ 53,545 $ 39,889 Diluted Distributed earnings to common shareholders $ 18,251 $ 16,203 Undistributed earnings allocated to common shareholders 35,294 23,686 Total common shareholders earnings, diluted $ 53,545 $ 39,889 Weighted average common shares outstanding 150,815 148,601 Effect of dilutive common stock awards 3,054 853 Diluted weighted average common shares outstanding 153,869 149,454 Basic earnings per common share $ 0.36 $ 0.27 Diluted earnings per common share $ 0.35 $ 0.27

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Fair value assumptions of stock options	The following assumptions were used in estimating the fair value for options granted in the first three months of 2017 and full year 2016 . 2017 2016 Dividend yield 2.00 % 2.50 % Risk-free interest rate 2.00 % 2.00 % Weighted average expected volatility 25.00 % 25.00 % Weighted average expected life 5.5 years 5.5 years Weighted average per share fair value of options $5.30 $3.36
Summary of Company's Stock Option Activities	A summary of the Corporation’s stock option activity for the three months ended March 31, 2017 is presented below. Stock Options Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (000s) Outstanding at December 31, 2016 6,357,843 $ 17.67 6.10 $ 47,902 Granted 799,558 $ 25.61 Exercised (1,038,549 ) 16.28 Forfeited or expired (432,001 ) 33.74 Outstanding at March 31, 2017 5,686,851 $ 18.07 7.00 $ 37,180 Options Exercisable at March 31, 2017 3,153,070 $ 16.47 5.59 $ 25,258
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)	The following table summarizes information about the Corporation’s restricted stock activity for the three months ended March 31, 2017 . Restricted Stock Shares Weighted Average Grant Date Fair Value Outstanding at December 31, 2016 2,377,380 $ 17.40 Granted 729,135 25.59 Vested (788,033 ) 17.87 Forfeited (52,838 ) 17.92 Outstanding at March 31, 2017 2,265,644 $ 19.86

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	The amortized cost and fair values of securities available for sale and held to maturity were as follows. March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: U. S. Treasury securities $ 1,004 $ 1 $ — $ 1,005 Residential mortgage-related securities: FNMA / FHLMC 575,826 15,710 (1,117 ) 590,419 GNMA 2,063,054 1,837 (25,065 ) 2,039,826 Private-label 1,118 — (16 ) 1,102 GNMA commercial mortgage-related securities 1,696,287 145 (33,095 ) 1,663,337 Other securities (debt and equity) 4,718 94 (11 ) 4,801 Total investment securities available for sale $ 4,342,007 $ 17,787 $ (59,304 ) $ 4,300,490 Investment securities held to maturity: Obligations of state and political subdivisions (municipal securities) $ 1,131,526 $ 7,150 $ (9,479 ) $ 1,129,197 Residential mortgage-related securities: FNMA / FHLMC 38,829 403 (727 ) 38,505 GNMA 88,256 146 (762 ) 87,640 GNMA commercial mortgage-related securities 296,232 5,005 (6,257 ) 294,980 Total investment securities held to maturity $ 1,554,843 $ 12,704 $ (17,225 ) $ 1,550,322 December 31, 2016 Amortized Gross Gross Fair Value ($ in Thousands) Investment securities available for sale: U. S. Treasury securities $ 1,000 $ — $ — $ 1,000 Residential mortgage-related securities: FNMA / FHLMC 625,234 17,298 (2,602 ) 639,930 GNMA 2,028,301 1,372 (25,198 ) 2,004,475 Private-label 1,134 1 (14 ) 1,121 GNMA commercial mortgage-related securities 2,064,508 356 (35,966 ) 2,028,898 Other securities (debt and equity) 4,718 105 (21 ) 4,802 Total investment securities available for sale $ 4,724,895 $ 19,132 $ (63,801 ) $ 4,680,226 Investment securities held to maturity: Municipal securities $ 1,145,843 $ 3,868 $ (12,036 ) $ 1,137,675 Residential mortgage-related securities: FNMA / FHLMC 37,697 439 (693 ) 37,443 GNMA 89,996 216 (656 ) 89,556 Total investment securities held to maturity $ 1,273,536 $ 4,523 $ (13,385 ) $ 1,264,674
Investment securities held to maturity	The amortized cost and fair values of securities available for sale and held to maturity were as follows. March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale: U. S. Treasury securities $ 1,004 $ 1 $ — $ 1,005 Residential mortgage-related securities: FNMA / FHLMC 575,826 15,710 (1,117 ) 590,419 GNMA 2,063,054 1,837 (25,065 ) 2,039,826 Private-label 1,118 — (16 ) 1,102 GNMA commercial mortgage-related securities 1,696,287 145 (33,095 ) 1,663,337 Other securities (debt and equity) 4,718 94 (11 ) 4,801 Total investment securities available for sale $ 4,342,007 $ 17,787 $ (59,304 ) $ 4,300,490 Investment securities held to maturity: Obligations of state and political subdivisions (municipal securities) $ 1,131,526 $ 7,150 $ (9,479 ) $ 1,129,197 Residential mortgage-related securities: FNMA / FHLMC 38,829 403 (727 ) 38,505 GNMA 88,256 146 (762 ) 87,640 GNMA commercial mortgage-related securities 296,232 5,005 (6,257 ) 294,980 Total investment securities held to maturity $ 1,554,843 $ 12,704 $ (17,225 ) $ 1,550,322 December 31, 2016 Amortized Gross Gross Fair Value ($ in Thousands) Investment securities available for sale: U. S. Treasury securities $ 1,000 $ — $ — $ 1,000 Residential mortgage-related securities: FNMA / FHLMC 625,234 17,298 (2,602 ) 639,930 GNMA 2,028,301 1,372 (25,198 ) 2,004,475 Private-label 1,134 1 (14 ) 1,121 GNMA commercial mortgage-related securities 2,064,508 356 (35,966 ) 2,028,898 Other securities (debt and equity) 4,718 105 (21 ) 4,802 Total investment securities available for sale $ 4,724,895 $ 19,132 $ (63,801 ) $ 4,680,226 Investment securities held to maturity: Municipal securities $ 1,145,843 $ 3,868 $ (12,036 ) $ 1,137,675 Residential mortgage-related securities: FNMA / FHLMC 37,697 439 (693 ) 37,443 GNMA 89,996 216 (656 ) 89,556 Total investment securities held to maturity $ 1,273,536 $ 4,523 $ (13,385 ) $ 1,264,674
Amortized cost and fair values of investment securities available for sale by contractual maturity	The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2017 , 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 $ 3,500 $ 3,489 $ 41,148 $ 32,101 Due after one year through five years 2,204 2,205 252,007 259,468 Due after five years through ten years — — 248,861 250,081 Due after ten years — — 589,510 587,547 Total debt securities 5,704 5,694 1,131,526 1,129,197 Residential mortgage-related securities: FNMA / FHLMC 575,826 590,419 38,829 38,505 GNMA 2,063,054 2,039,826 88,256 87,640 Private-label 1,118 1,102 — — GNMA commercial mortgage-related securities 1,696,287 1,663,337 296,232 294,980 Equity securities 18 112 — — Total investment securities $ 4,342,007 $ 4,300,490 $ 1,554,843 $ 1,550,322 Ratio of Fair Value to Amortized Cost 99.0 % 99.7 %
Realized gains and losses and proceeds from sale	Three Months Ended March 31, 2017 2016 ($ in Thousands) Gross gains $ — $ 3,287 Gross losses — (189 ) Investment securities gains, net $ — $ 3,098 Proceeds from sales of investment securities $ — $ 119,379
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length	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 individual securities have been in a continuous unrealized loss position, at March 31, 2017 . Less than 12 months 12 months or more Total March 31, 2017 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: Residential mortgage-related securities: FNMA / FHLMC 13 $ (1,117 ) $ 216,103 — $ — $ — $ (1,117 ) $ 216,103 GNMA 56 (25,065 ) 1,638,688 — — — (25,065 ) 1,638,688 Private-label — — — 1 (16 ) 1,100 (16 ) 1,100 GNMA commercial mortgage-related securities 73 (15,538 ) 1,214,494 19 (17,557 ) 368,724 (33,095 ) 1,583,218 Other securities (debt and equity) 3 (11 ) 1,489 — — — (11 ) 1,489 Total 145 $ (41,731 ) $ 3,070,774 20 $ (17,573 ) $ 369,824 $ (59,304 ) $ 3,440,598 Investment securities held to maturity: Municipal securities 538 $ (9,407 ) $ 342,534 4 $ (72 ) $ 1,778 $ (9,479 ) $ 344,312 Residential mortgage-related securities: FNMA / FHLMC 16 (480 ) 19,969 1 (247 ) 5,785 (727 ) 25,754 GNMA 38 (762 ) 62,494 — — — (762 ) 62,494 GNMA commercial mortgage-related securities 9 (4,369 ) 255,424 2 (1,888 ) 39,556 (6,257 ) 294,980 Total 601 $ (15,018 ) $ 680,421 7 $ (2,207 ) $ 47,119 $ (17,225 ) $ 727,540 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, 2016 . Less than 12 months 12 months or more Total December 31, 2016 Number Unrealized Fair Number Unrealized Fair Unrealized Fair ($ in Thousands) Investment securities available for sale: Residential mortgage-related securities: FNMA / FHLMC 14 $ (2,602 ) $ 244,252 — $ — $ — $ (2,602 ) $ 244,252 GNMA 54 (25,198 ) 1,723,523 — — — (25,198 ) 1,723,523 Private-label — — — 1 (14 ) 1,119 (14 ) 1,119 GNMA commercial mortgage-related securities 74 (16,445 ) 1,427,889 21 (19,521 ) 429,258 (35,966 ) 1,857,147 Other securities (debt and equity) 3 (21 ) 1,479 — — — (21 ) 1,479 Total 145 $ (44,266 ) $ 3,397,143 22 $ (19,535 ) $ 430,377 $ (63,801 ) $ 3,827,520 Investment securities held to maturity: Municipal securities 700 $ (11,937 ) $ 414,186 4 $ (99 ) $ 1,752 $ (12,036 ) $ 415,938 Residential mortgage-related securities: FNMA / FHLMC 14 (441 ) 17,477 1 (252 ) 6,031 (693 ) 23,508 GNMA 39 (656 ) 64,633 — — — (656 ) 64,633 Total 753 $ (13,034 ) $ 496,296 5 $ (351 ) $ 7,783 $ (13,385 ) $ 504,079

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loan composition	The period end loan composition was as follows. March 31, December 31, ($ in Thousands) Commercial and industrial $ 6,300,646 $ 6,489,014 Commercial real estate — owner occupied 878,391 897,724 Commercial and business lending 7,179,037 7,386,738 Commercial real estate — investor 3,415,355 3,574,732 Real estate construction 1,553,205 1,432,497 Commercial real estate lending 4,968,560 5,007,229 Total commercial 12,147,597 12,393,967 Residential mortgage 6,715,282 6,332,327 Home equity 911,969 934,443 Other consumer 372,835 393,979 Total consumer 8,000,086 7,660,749 Total loans $ 20,147,683 $ 20,054,716
Commercial and consumer loans by credit quality indicator	The following table presents commercial and consumer loans by credit quality indicator at March 31, 2017 . Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 5,816,591 $ 100,234 $ 218,930 $ 164,891 $ 6,300,646 Commercial real estate - owner occupied 793,177 8,295 58,994 17,925 878,391 Commercial and business lending 6,609,768 108,529 277,924 182,816 7,179,037 Commercial real estate - investor 3,336,105 21,760 49,217 8,273 3,415,355 Real estate construction 1,541,779 38 10,141 1,247 1,553,205 Commercial real estate lending 4,877,884 21,798 59,358 9,520 4,968,560 Total commercial 11,487,652 130,327 337,282 192,336 12,147,597 Residential mortgage 6,658,070 874 2,155 54,183 6,715,282 Home equity 897,452 1,085 220 13,212 911,969 Other consumer 372,064 511 — 260 372,835 Total consumer 7,927,586 2,470 2,375 67,655 8,000,086 Total $ 19,415,238 $ 132,797 $ 339,657 $ 259,991 $ 20,147,683 The following table presents commercial and consumer loans by credit quality indicator at December 31, 2016 . Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 5,937,119 $ 141,328 $ 227,196 $ 183,371 $ 6,489,014 Commercial real estate - owner occupied 805,871 17,785 64,524 9,544 897,724 Commercial and business lending 6,742,990 159,113 291,720 192,915 7,386,738 Commercial real estate - investor 3,491,217 14,236 51,228 18,051 3,574,732 Real estate construction 1,429,083 105 2,465 844 1,432,497 Commercial real estate lending 4,920,300 14,341 53,693 18,895 5,007,229 Total commercial 11,663,290 173,454 345,413 211,810 12,393,967 Residential mortgage 6,275,162 1,314 5,615 50,236 6,332,327 Home equity 919,740 1,588 114 13,001 934,443 Other consumer 393,161 562 — 256 393,979 Total consumer 7,588,063 3,464 5,729 63,493 7,660,749 Total $ 19,251,353 $ 176,918 $ 351,142 $ 275,303 $ 20,054,716
Summarized details of Loans	The following table presents loans by past due status at March 31, 2017 . Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Nonaccrual (b) Total ($ in Thousands) Commercial and industrial $ 6,133,822 $ 752 $ 923 $ 258 $ 164,891 $ 6,300,646 Commercial real estate - owner occupied 859,496 500 470 — 17,925 878,391 Commercial and business lending 6,993,318 1,252 1,393 258 182,816 7,179,037 Commercial real estate - investor 3,405,960 920 202 — 8,273 3,415,355 Real estate construction 1,551,527 393 38 — 1,247 1,553,205 Commercial real estate lending 4,957,487 1,313 240 — 9,520 4,968,560 Total commercial 11,950,805 2,565 1,633 258 192,336 12,147,597 Residential mortgage 6,653,856 4,238 3,005 — 54,183 6,715,282 Home equity 894,245 3,406 1,106 — 13,212 911,969 Other consumer 369,455 1,013 645 1,462 260 372,835 Total consumer 7,917,556 8,657 4,756 1,462 67,655 8,000,086 Total $ 19,868,361 $ 11,222 $ 6,389 $ 1,720 $ 259,991 $ 20,147,683 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at March 31, 2017 (the same as the reported balances for the accruing loans noted above). (b) Of the total nonaccrual loans, $194 million or 75% were current with respect to payment at March 31, 2017 . The following table presents loans by past due status at December 31, 2016 . Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due (a) Nonaccrual (b) Total ($ in Thousands) Commercial and industrial $ 6,303,994 $ 965 $ 448 $ 236 $ 183,371 $ 6,489,014 Commercial real estate - owner occupied 886,796 968 416 — 9,544 897,724 Commercial and business lending 7,190,790 1,933 864 236 192,915 7,386,738 Commercial real estate - investor 3,555,750 431 500 — 18,051 3,574,732 Real estate construction 1,431,284 264 105 — 844 1,432,497 Commercial real estate lending 4,987,034 695 605 — 18,895 5,007,229 Total commercial 12,177,824 2,628 1,469 236 211,810 12,393,967 Residential mortgage 6,273,949 7,298 844 — 50,236 6,332,327 Home equity 915,593 4,265 1,584 — 13,001 934,443 Other consumer 389,157 2,471 718 1,377 256 393,979 Total consumer 7,578,699 14,034 3,146 1,377 63,493 7,660,749 Total $ 19,756,523 $ 16,662 $ 4,615 $ 1,613 $ 275,303 $ 20,054,716 (a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2016 (the same as the reported balances for the accruing loans noted above). (b) Of the total nonaccrual loans, $224 million or 81% were current with respect to payment at December 31, 2016 .
Summarized details of impaired Loans	The following table presents impaired loans at March 31, 2017 . Recorded Unpaid Related Average Interest ($ in Thousands) Loans with a related allowance Commercial and industrial $ 124,408 $ 135,061 $ 26,686 $ 130,361 $ 305 Commercial real estate — owner occupied 14,918 16,833 1,766 15,045 113 Commercial and business lending 139,326 151,894 28,452 145,406 418 Commercial real estate — investor 16,018 16,497 319 16,060 371 Real estate construction 1,349 1,663 533 1,369 32 Commercial real estate lending 17,367 18,160 852 17,429 403 Total commercial 156,693 170,054 29,304 162,835 821 Residential mortgage 66,221 71,013 11,860 66,495 588 Home equity 20,775 22,958 9,528 20,964 250 Other consumer 1,301 1,327 192 1,309 6 Total consumer 88,297 95,298 21,580 88,768 844 Total loans (a) $ 244,990 $ 265,352 $ 50,884 $ 251,603 $ 1,665 Loans with no related allowance Commercial and industrial $ 71,335 $ 75,212 $ — $ 73,314 $ 93 Commercial real estate — owner occupied 8,539 9,409 — 8,582 — Commercial and business lending 79,874 84,621 — 81,896 93 Commercial real estate — investor 6,818 7,219 — 6,853 — Real estate construction 225 225 — 225 — Commercial real estate lending 7,043 7,444 — 7,078 — Total commercial 86,917 92,065 — 88,974 93 Residential mortgage 6,497 7,521 — 6,507 68 Home equity 646 650 — 647 — Other consumer — — — — — Total consumer 7,143 8,171 — 7,154 68 Total loans (a) $ 94,060 $ 100,236 $ — $ 96,128 $ 161 Total Commercial and industrial $ 195,743 $ 210,273 $ 26,686 $ 203,675 $ 398 Commercial real estate — owner occupied 23,457 26,242 1,766 23,627 113 Commercial and business lending 219,200 236,515 28,452 227,302 511 Commercial real estate — investor 22,836 23,716 319 22,913 371 Real estate construction 1,574 1,888 533 1,594 32 Commercial real estate lending 24,410 25,604 852 24,507 403 Total commercial 243,610 262,119 29,304 251,809 914 Residential mortgage 72,718 78,534 11,860 73,002 656 Home equity 21,421 23,608 9,528 21,611 250 Other consumer 1,301 1,327 192 1,309 6 Total consumer 95,440 103,469 21,580 95,922 912 Total loans (a) $ 339,050 $ 365,588 $ 50,884 $ 347,731 $ 1,826 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 79% of the unpaid principal balance at March 31, 2017 . The following table presents impaired loans at December 31, 2016 . Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized ($ in Thousands) Loans with a related allowance Commercial and industrial $ 101,770 $ 107,813 $ 21,617 $ 111,211 $ 2,512 Commercial real estate — owner occupied 6,595 8,641 295 7,111 274 Commercial and business lending 108,365 116,454 21,912 118,322 2,786 Commercial real estate — investor 27,196 27,677 3,541 31,142 2,124 Real estate construction 1,203 1,566 441 1,321 67 Commercial real estate lending 28,399 29,243 3,982 32,463 2,191 Total commercial 136,764 145,697 25,894 150,785 4,977 Residential mortgage 62,362 67,090 11,091 63,825 2,263 Home equity 20,651 22,805 9,312 21,825 1,114 Other consumer 1,235 1,284 186 1,294 29 Total consumer 84,248 91,179 20,589 86,944 3,406 Total loans (a) $ 221,012 $ 236,876 $ 46,483 $ 237,729 $ 8,383 Loans with no related allowance Commercial and industrial $ 113,485 $ 134,863 $ — $ 117,980 $ 1,519 Commercial real estate — owner occupied 8,439 9,266 — 8,759 138 Commercial and business lending 121,924 144,129 — 126,739 1,657 Commercial real estate — investor 6,144 6,478 — 7,092 — Real estate construction — — — — — Commercial real estate lending 6,144 6,478 — 7,092 — Total commercial 128,068 150,607 — 133,831 1,657 Residential mortgage 5,974 6,998 — 6,610 184 Home equity 106 107 — 107 4 Other consumer — — — — — Total consumer 6,080 7,105 — 6,717 188 Total loans (a) $ 134,148 $ 157,712 $ — $ 140,548 $ 1,845 Total Commercial and industrial $ 215,255 $ 242,676 $ 21,617 $ 229,191 $ 4,031 Commercial real estate — owner occupied 15,034 17,907 295 15,870 412 Commercial and business lending 230,289 260,583 21,912 245,061 4,443 Commercial real estate — investor 33,340 34,155 3,541 38,234 2,124 Real estate construction 1,203 1,566 441 1,321 67 Commercial real estate lending 34,543 35,721 3,982 39,555 2,191 Total commercial 264,832 296,304 25,894 284,616 6,634 Residential mortgage 68,336 74,088 11,091 70,435 2,447 Home equity 20,757 22,912 9,312 21,932 1,118 Other consumer 1,235 1,284 186 1,294 29 Total consumer 90,328 98,284 20,589 93,661 3,594 Total loans (a) $ 355,160 $ 394,588 $ 46,483 $ 378,277 $ 10,228 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 78% of the unpaid principal balance at December 31, 2016 .
Nonaccrual and performing restructured loans	The following table presents nonaccrual and performing restructured loans by loan portfolio. March 31, 2017 December 31, 2016 Performing Restructured Loans Nonaccrual Restructured Loans (a) Performing Restructured Loans Nonaccrual Restructured Loans (a) ($ in Thousands) Commercial and industrial $ 30,852 $ 52,079 $ 31,884 $ 1,276 Commercial real estate — owner occupied 5,532 2,148 5,490 2,220 Commercial real estate — investor 14,563 1,643 15,289 924 Real estate construction 327 170 359 150 Residential mortgage 18,535 20,457 18,100 21,906 Home equity 8,209 2,379 7,756 2,877 Other consumer 1,041 26 979 32 Total $ 79,059 $ 78,902 $ 79,857 $ 29,385 (a) Nonaccrual restructured loans have been included within nonaccrual loans.
Summary of restructured loans	The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three months ended March 31, 2017 and 2016 , respectively, and the recorded investment and unpaid principal balance as of March 31, 2017 and 2016 respectively. Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) ($ in Thousands) Commercial and industrial 20 $ 52,326 $ 60,546 7 $ 1,483 $ 1,522 Commercial real estate — owner occupied 1 204 204 1 125 130 Commercial real estate — investor 1 733 744 — — — Real estate construction — — — 1 10 55 Residential mortgage 16 1,301 1,322 30 2,062 2,124 Home equity 15 347 347 20 818 879 Total 53 $ 54,911 $ 63,163 59 $ 4,498 $ 4,710 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-modification outstanding recorded investment.
Troubled debt restructurings subsequent redefault	The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2017 and 2016 , respectively, as well as the recorded investment in these restructured loans as of March 31, 2017 and 2016 , respectively. Three Months Ended March 31, 2017 Three Month Ended March 31, 2016 Number of Loans Recorded Investment Number of Loans Recorded Investment ($ in Thousands) Real estate construction — $ — 1 $ 10 Residential mortgage 6 383 7 1,151 Home equity 2 26 8 153 Total 8 $ 409 16 $ 1,314
Changes in the allowance for loan losses by portfolio segment	For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2016 , was as follows. $ in Thousands Commercial and industrial Commercial real estate - owner occupied Commercial real estate - investor Real estate construction Residential mortgage Home equity Other consumer Total December 31, 2015 $ 129,959 $ 18,680 $ 43,018 $ 25,266 $ 28,261 $ 23,555 $ 5,525 $ 274,264 Charge offs (71,016 ) (512 ) (1,504 ) (558 ) (4,332 ) (4,686 ) (3,831 ) (86,439 ) Recoveries 14,543 74 1,624 203 755 3,491 820 21,510 Net charge offs (56,473 ) (438 ) 120 (355 ) (3,577 ) (1,195 ) (3,011 ) (64,929 ) Provision for loan losses 66,640 (4,208 ) 2,147 2,021 2,362 (1,996 ) 2,034 69,000 December 31, 2016 $ 140,126 $ 14,034 $ 45,285 $ 26,932 $ 27,046 $ 20,364 $ 4,548 $ 278,335 Allowance for loan losses: Individually evaluated for impairment $ 20,836 $ — $ 3,117 $ — $ 147 $ 3 $ — $ 24,103 Collectively evaluated for impairment 119,290 14,034 42,168 26,932 26,899 20,361 4,548 254,232 Total allowance for loan losses $ 140,126 $ 14,034 $ 45,285 $ 26,932 $ 27,046 $ 20,364 $ 4,548 $ 278,335 Loans: Individually evaluated for impairment $ 180,965 $ 8,439 $ 17,322 $ — $ 7,033 $ 650 $ — $ 214,409 Collectively evaluated for impairment 6,308,049 889,285 3,557,410 1,432,497 6,325,294 933,793 393,979 19,840,307 Total loans $ 6,489,014 $ 897,724 $ 3,574,732 $ 1,432,497 $ 6,332,327 $ 934,443 $ 393,979 $ 20,054,716 A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 , was as follows. $ in Thousands Commercial and industrial Commercial real estate - owner occupied Commercial real estate - investor Real estate construction Residential mortgage Home equity Other consumer Total December 31, 2016 $ 140,126 $ 14,034 $ 45,285 $ 26,932 $ 27,046 $ 20,364 $ 4,548 $ 278,335 Charge offs (9,359 ) (5 ) (633 ) (23 ) (297 ) (509 ) (1,028 ) (11,854 ) Recoveries 4,991 24 119 34 169 682 172 6,191 Net charge offs (4,368 ) 19 (514 ) 11 (128 ) 173 (856 ) (5,663 ) Provision for loan losses 10,509 (2,841 ) (3,406 ) 1,825 3,370 (223 ) 766 10,000 March 31, 2017 $ 146,267 $ 11,212 $ 41,365 $ 28,768 $ 30,288 $ 20,314 $ 4,458 $ 282,672 Allowance for loan losses: Individually evaluated for impairment $ 25,915 $ 1,541 $ 99 $ — $ 810 $ — $ — $ 28,365 Collectively evaluated for impairment 120,352 9,671 41,266 28,768 29,478 20,314 4,458 254,307 Total allowance for loan losses $ 146,267 $ 11,212 $ 41,365 $ 28,768 $ 30,288 $ 20,314 $ 4,458 $ 282,672 Loans: Individually evaluated for impairment $ 162,788 $ 17,098 $ 7,615 $ 225 $ 11,086 $ 647 $ — $ 199,459 Collectively evaluated for impairment 6,137,858 861,293 3,407,740 1,552,980 6,704,196 911,322 372,835 19,948,224 Total loans $ 6,300,646 $ 878,391 $ 3,415,355 $ 1,553,205 $ 6,715,282 $ 911,969 $ 372,835 $ 20,147,683
Changes in the allowance for unfunded commitments	A summary of the changes in the allowance for unfunded commitments was as follows. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Allowance for Unfunded Commitments: Balance at beginning of period $ 25,400 $ 24,400 Provision for unfunded commitments (1,000 ) 1,000 Balance at end of period $ 24,400 $ 25,400

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Core deposit intangibles: Gross carrying amount $ 4,385 $ 4,385 Accumulated amortization (4,340 ) (4,273 ) Net book value $ 45 $ 112 Amortization during the year $ 67 $ 281 Other intangibles: Gross carrying amount $ 32,572 $ 32,410 Accumulated amortization (17,591 ) (17,145 ) Net book value $ 14,981 $ 15,265 Additions during the period $ 162 $ 1,012 Amortization during the year $ 446 $ 1,812
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance	A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Mortgage servicing rights Mortgage servicing rights at beginning of period $ 62,085 $ 62,150 Additions 1,920 12,262 Amortization (2,477 ) (12,327 ) Mortgage servicing rights at end of period $ 61,528 $ 62,085 Valuation allowance at beginning of period (609 ) (809 ) (Additions) recoveries, net (217 ) 200 Valuation allowance at end of period (826 ) (609 ) Mortgage servicing rights, net $ 60,702 $ 61,476 Fair value of mortgage servicing rights $ 68,037 $ 73,149 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,908,799 $ 7,974,742 Mortgage servicing rights, net to servicing portfolio 0.77 % 0.77 % Mortgage servicing rights expense (a) $ 2,694 $ 12,127 (a) 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	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 March 31, 2017 . 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) Nine months ending December 31, 2017 $ 45 $ 1,351 $ 7,275 2018 — 1,771 8,389 2019 — 1,472 7,100 2020 — 1,355 6,025 2021 — 1,331 5,128 2022 — 1,308 4,385 Beyond 2022 — 6,393 23,226 Total Estimated Amortization Expense $ 45 $ 14,981 $ 61,528

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Breakdown of short & long-term debt balances	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. March 31, 2017 December 31, 2016 ($ in Thousands) Short-Term Funding Federal funds purchased $ 323,365 $ 208,150 Securities sold under agreements to repurchase 326,823 300,197 Federal funds purchased and securities sold under agreements to repurchase $ 650,188 $ 508,347 FHLB advances 309,000 482,000 Commercial paper 121,679 101,688 Other short-term funding 430,679 583,688 Total short-term funding $ 1,080,867 $ 1,092,035 Long-Term Funding FHLB advances $ 2,265,180 $ 2,265,188 Senior notes, at par 250,000 250,000 Subordinated notes, at par 250,000 250,000 Other long-term funding and capitalized costs (3,225 ) (3,393 ) Total long-term funding 2,761,955 2,761,795 Total short and long-term funding $ 3,842,822 $ 3,853,830
Remaining contractual maturity of securities sold under agreements to repurchase	The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of March 31, 2017 and December 31, 2016 are presented in the following table. Remaining Contractual Maturity of the Agreements March 31, 2017 Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total ($ in Thousands) Repurchase agreements Agency mortgage-related securities $ 326,823 $ — $ — $ — $ 326,823 Total $ 326,823 $ — $ — $ — $ 326,823 December 31, 2016 Repurchase agreements Agency mortgage-related securities $ 300,197 $ — $ — $ — $ 300,197 Total $ 300,197 $ — $ — $ — $ 300,197

Derivative and Hedging Activi32

Derivative and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Balance sheet category and fair values of derivative instruments not designated as hedging instruments	The table below identifies the balance sheet category and fair values of the Corporation’s free standing derivative instruments, which are not designated as hedging instruments. March 31, 2017 December 31, 2016 ($ in Thousands) Notional Amount Fair Value Balance Sheet Category Notional Amount Fair Balance Sheet Interest rate-related instruments — customer and mirror $ 2,098,658 $ 31,841 Trading assets $ 2,039,323 $ 33,671 Trading assets Interest rate-related instruments — customer and mirror 2,098,658 (31,113 ) Trading liabilities 2,039,323 (33,188 ) Trading liabilities Foreign currency exchange forwards 83,012 812 Trading assets 109,675 2,002 Trading assets Foreign currency exchange forwards 80,227 (774 ) Trading liabilities 106,251 (1,943 ) Trading liabilities Commodity contracts 301,425 16,653 Trading assets 127,582 16,725 Trading assets Commodity contracts 300,011 (15,674 ) Trading liabilities 128,368 (15,972 ) Trading liabilities
Summary Of Other derivative instruments not designated as hedging instruments	The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments which are not designated as hedging instruments. March 31, 2017 December 31, 2016 ($ in Thousands) Notional Amount Fair Balance Sheet Notional Amount Fair Balance Sheet Interest rate lock commitments (mortgage) 291,674 1,803 Other assets 285,345 206 Other assets Forward commitments (mortgage) 100,750 (373 ) Other liabil ities 179,600 2,908 Other assets Purchased options (time deposit) 80,116 2,290 Other assets 80,554 2,576 Other assets Written options (time deposit) 80,116 (2,290 ) Other liabilities 80,554 (2,576 ) Other liabilities
Gain (loss) on derivative instruments not designated as hedging instruments	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 For the Three Months Ended March 31, ($ in Thousands) 2017 2016 Derivative Instruments: Interest rate-related instruments — customer and mirror, net Capital market fees, net $ 245 $ (870 ) Interest rate lock commitments (mortgage) Mortgage banking, net 1,597 1,731 Forward commitments (mortgage) Mortgage banking, net (3,281 ) (2,135 ) Foreign currency exchange forwards Capital market fees, net (21 ) (28 ) Commodity contracts Capital market fees, net 226 —

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	3 Months Ended
	Mar. 31, 2017
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. The interest and commodity 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 not offset in the balance sheet Gross amounts offset in the balance sheet Net amounts presented in the balance sheet Financial instruments Collateral Net amount ($ in Thousands) March 31, 2017 Derivative assets: Interest and commodity agreements $ 23,374 $ — $ 23,374 $ (19,022 ) $ (4,352 ) $ — Derivative liabilities: Interest and commodity agreements $ 19,022 $ — $ 19,022 $ (19,022 ) $ — $ — December 31, 2016 Derivative assets: Interest and commodity agreements $ 18,031 $ — $ 18,031 $ (18,031 ) $ — $ — Derivative liabilities: Interest and commodity agreements $ 31,075 $ — $ 31,075 $ (18,031 ) $ (11,148 ) $ 1,896

Commitments, Off-Balance Shee34

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments. March 31, 2017 December 31, 2016 ($ in Thousands) Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 8,041,839 $ 8,131,131 Commercial letters of credit (a) 7,490 7,923 Standby letters of credit (c) 268,612 259,632 (a) 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 March 31, 2017 or December 31, 2016 . (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10 . (c) The Corporation has established a liability of $3 million at both March 31, 2017 and December 31, 2016 , as an estimate of the fair value of these financial instruments.
Summary of changes in the residential mortgage repurchase reserve	The following summarizes the changes in the mortgage repurchase reserve. Three Months Ended March 31, 2017 Year Ended December 31, 2016 ($ in Thousands) Balance at beginning of period $ 900 $ 1,197 Repurchase provision expense 59 456 Adjustments to provision expense — (750 ) Charge offs, net — (3 ) Balance at end of period $ 959 $ 900

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured on Recurring Basis at Fair Value	The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 , aggregated by the level in the fair value hierarchy within which those measurements fall. Fair Value Hierarchy March 31, 2017 December 31, 2016 ($ in Thousands) Assets: Investment securities available for sale: U.S. Treasury securities Level 1 $ 1,005 $ 1,000 Residential mortgage-related securities: FNMA / FHLMC Level 2 590,419 639,930 GNMA Level 2 2,039,826 2,004,475 Private-label Level 2 1,102 1,121 GNMA commercial mortgage-related securities Level 2 1,663,337 2,028,898 Other securities (debt and equity) Level 1 1,601 1,602 Other securities (debt and equity) Level 2 3,200 3,000 Other securities (debt and equity) Level 3 — 200 Total investment securities available for sale Level 1 2,606 2,602 Total investment securities available for sale Level 2 4,297,884 4,677,424 Total investment securities available for sale Level 3 — 200 Residential loans held for sale (a) Level 2 34,051 — Interest rate-related instruments Level 2 31,841 33,671 Foreign currency exchange forwards Level 2 812 2,002 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 1,803 206 Forward commitments to sell residential mortgage loans Level 3 — 2,908 Commodity contracts Level 2 16,653 16,725 Purchased options (time deposit) Level 2 2,290 2,576 Liabilities: Interest rate-related instruments Level 2 $ 31,113 $ 33,188 Foreign currency exchange forwards Level 2 774 1,943 Forward commitments to sell residential mortgage loans Level 3 373 — Commodity contracts Level 2 15,674 15,972 Written options (time deposit) Level 2 2,290 2,576 (a) Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements.
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)	The table below presents a rollforward of the balance sheet amounts for the three months ended March 31, 2017 and the year ended December 31, 2016 , 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, 2015 $ 200 $ 1,361 Total net gains included in income: Mortgage derivative gain — 1,753 Balance December 31, 2016 $ 200 $ 3,114 Total net losses included in income: Mortgage derivative loss — (1,684 ) Transfer out of level 3 securities (a) (200 ) — Balance March 31, 2017 $ — $ 1,430 (a) During the first quarter of 2017, the $200,000 level 3 investment security was transferred to level 2 based upon new pricing information.
Assets and Liabilities Measured on Nonrecurring Basis at Fair Value	The table below presents the Corporation’s loans held for sale, impaired loans, and mortgage servicing rights measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall. Income Statement Category of Adjustment Recognized in Income ($ in Thousands) Fair Value Hierarchy Fair Value March 31, 2017 Assets: Commercial loans held for sale (a) Level 2 $ 2,901 Provision for credit losses $ — Impaired loans (c) Level 3 93,552 Provision for credit losses (25,785 ) Other real estate owned Level 2 921 Foreclosure / OREO expense, net (583 ) Mortgage servicing rights Level 3 68,037 Mortgage banking, net (217 ) December 31, 2016 Assets: Commercial loans held for sale Level 2 $ 12,474 Provision for credit losses $ (559 ) Residential loans held for sale (b) Level 2 108,010 Mortgage banking, net (3,760 ) Impaired loans (c) Level 3 79,270 Provision for credit losses (75,194 ) Other real estate owned Level 2 9,752 Foreclosure / OREO expense, net (1,091 ) Mortgage servicing rights Level 3 73,149 Mortgage banking, net 200 (a) Commercial loans held for sale are carried at the lower of cost or estimated fair value. At March 31, 2017 , the estimated fair value exceeded the cost and therefore there was no adjustment recognized in Income. (b) Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements. (c) Represents individually evaluated impaired loans, net of the related allowance for loan losses.
Estimated fair values of financial instruments	Fair value estimates, methods, and assumptions are set forth below for the Corporation’s financial instruments. March 31, 2017 December 31, 2016 Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value ($ in Thousands) Financial assets: Cash and due from banks Level 1 $ 332,601 $ 332,601 $ 446,558 $ 446,558 Interest-bearing deposits in other financial institutions Level 1 337,167 337,167 149,175 149,175 Federal funds sold and securities purchased under agreements to resell Level 1 19,700 19,700 46,500 46,500 Investment securities held to maturity Level 2 1,554,843 1,550,322 1,273,536 1,264,674 Investment securities available for sale Level 1 2,606 2,606 2,602 2,602 Investment securities available for sale Level 2 4,297,884 4,297,884 4,677,424 4,677,424 Investment securities available for sale Level 3 — — 200 200 FHLB and Federal Reserve Bank stocks Level 2 139,273 139,273 140,001 140,001 Commercial loans held for sale Level 2 2,901 2,901 12,474 12,474 Residential loans held for sale Level 2 34,051 34,051 108,010 108,010 Loans, net Level 3 19,865,011 19,752,810 19,776,381 19,680,317 Bank owned life insurance Level 2 587,600 587,600 585,290 585,290 Derivatives (trading and other assets) Level 2 51,596 51,596 54,974 54,974 Derivatives (trading and other assets) Level 3 1,803 1,803 3,114 3,114 Financial liabilities: Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 20,213,126 $ 20,213,126 $ 20,282,321 $ 20,282,321 Brokered CDs and other time deposits Level 2 1,614,909 1,614,909 1,606,127 1,606,127 Short-term funding Level 2 1,080,867 1,080,867 1,092,035 1,092,035 Long-term funding Level 2 2,761,955 2,790,093 2,761,795 2,791,841 Standby letters of credit (a) Level 2 2,648 2,648 2,566 2,566 Derivatives (trading and other liabilities) Level 2 49,851 49,851 53,679 53,679 Derivatives (trading and other liabilities) Level 3 373 373 — — (a) The commitment on standby letters of credit was $269 million and $260 million at March 31, 2017 and December 31, 2016 , respectively. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Net period benefit cost for the pension and postretirement plans	The components of net periodic benefit cost for the RAP and Postretirement Plans for three months ended March 31, 2017 and 2016 were as follows. Three Months Ended March 31, 2017 2016 ($ in Thousands) Components of Net Periodic Benefit Cost Pension Plan: Service cost $ 1,781 $ 1,725 Interest cost 1,756 1,780 Expected return on plan assets (4,881 ) (5,065 ) Amortization of prior service cost (19 ) 13 Amortization of actuarial loss 488 482 Total net pension cost $ (875 ) $ (1,065 ) Postretirement Plan: Interest cost $ 24 $ 36 Amortization of prior service cost (19 ) — Total net periodic benefit cost $ 5 $ 36

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Selected segment information	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 Three Months Ended March 31, 2017 Net interest income $ 89,388 $ 88,928 $ 1,958 $ 180,274 Noninterest income 11,993 64,870 2,968 79,831 Total revenue 101,381 153,798 4,926 260,105 Credit provision* 11,580 4,507 (7,087 ) 9,000 Noninterest expense 37,479 116,097 20,115 173,691 Income (loss) before income taxes 52,322 33,194 (8,102 ) 77,414 Income tax expense (benefit) 17,649 11,618 (8,123 ) 21,144 Net income $ 34,673 $ 21,576 $ 21 $ 56,270 Return on average allocated capital (ROCET1)** 12.6 % 15.2 % (2.5 )% 10.6 % Three Months Ended March 31, 2016 Net interest income $ 79,164 $ 85,605 $ 7,218 $ 171,987 Noninterest income 11,613 63,748 7,831 83,192 Total revenue 90,777 149,353 15,049 255,179 Credit provision* 12,739 6,142 1,119 20,000 Noninterest expense 34,403 121,295 18,273 173,971 Income (loss) before income taxes 43,635 21,916 (4,343 ) 61,208 Income tax expense (benefit) 14,579 7,670 (3,575 ) 18,674 Net income (loss) $ 29,056 $ 14,246 $ (768 ) $ 42,534 Return on average allocated capital (ROCET1)** 11.3 % 9.1 % (5.0 )% 8.6 % Segment Balance Sheet Data ($ in Thousands) Corporate and Commercial Specialty Community, Consumer, and Business Risk Management and Shared Services Consolidated Total Three Months Ended March 31, 2017 Average earning assets $ 10,759,811 $ 9,130,457 $ 6,449,046 $ 26,339,314 Average loans 10,753,314 9,128,656 190,755 20,072,725 Average deposits 6,420,401 11,337,064 3,708,257 21,465,722 Average allocated capital (CET1)** $ 1,114,610 $ 576,464 $ 370,675 $ 2,061,749 Three Months Ended March 31, 2016 Average earning assets $ 9,720,028 $ 9,120,319 $ 6,432,026 $ 25,272,373 Average loans 9,711,221 9,119,020 92,589 18,922,830 Average deposits 5,918,341 11,100,195 3,556,638 20,575,174 Average allocated capital (CET1)** $ 1,031,659 $ 627,211 $ 237,611 $ 1,896,481 * 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 common equity Tier 1. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1. 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 Comprehensi38

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Summary of activity in accumulated other comprehensive income (loss)	The following table summarizes the components of accumulated other comprehensive income (loss) at March 31, 2017 and 2016 , changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three month periods ended March 31, 2017 and 2016 , respectively. ($ in Thousands) Investments Securities Available For Sale Defined Benefit Pension and Post Retirement Obligations Accumulated Other Comprehensive Income (Loss) Balance January 1, 2017 $ (20,079 ) $ (34,600 ) $ (54,679 ) Other comprehensive loss before reclassifications (2,112 ) — (2,112 ) Amounts reclassified from accumulated other comprehensive income (loss): Personnel expense — 450 450 Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities) (1,027 ) — (1,027 ) Income tax (expense) benefit 1,195 (171 ) 1,024 Net other comprehensive income during period (1,944 ) 279 (1,665 ) Balance March 31, 2017 $ (22,023 ) $ (34,321 ) $ (56,344 ) Balance January 1, 2016 $ 459 $ (33,075 ) $ (32,616 ) Other comprehensive income before reclassifications 60,422 — 60,422 Amounts reclassified from accumulated other comprehensive income (loss): Investment securities gain, net (3,098 ) — (3,098 ) Personnel expense — 495 495 Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities) (1,572 ) — (1,572 ) Income tax expense (21,275 ) (189 ) (21,464 ) Net other comprehensive income during period 34,477 306 34,783 Balance March 31, 2016 $ 34,936 $ (32,769 ) $ 2,167

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)acquisition	Mar. 31, 2016USD ($)acquisition	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill acquired during period	$ 55	$ 3,000
Additions to finite-lived intangible assets	$ 162	$ 1,000
Number of Acquisitions | acquisition	1	2
Other Intangible Assets
Business Acquisition [Line Items]
Additions to finite-lived intangible assets	$ 162		$ 1,012

Summary of Significant Accoun40

Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended
	Dec. 31, 2016USD ($)
Reduction in Taxes
Summary of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 1

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Calculations for basic and diluted earnings per common share
Net income	$ 56,270	$ 42,534
Preferred stock dividends	(2,330)	(2,198)
Net income available to common equity	53,940	40,336
Common shareholder dividends	(18,251)	(16,203)
Unvested share-based payment awards	(117)	(206)
Undistributed earnings	35,572	23,927
Undistributed earnings allocated to common shareholders	35,294	23,686
Undistributed earnings allocated to unvested share-based payment awards	278	241
Undistributed earnings	35,572	23,927
Basic
Distributed earnings to common shareholders	18,251	16,203
Undistributed earnings allocated to common shareholders	35,294	23,686
Total common shareholders earnings, basic	53,545	39,889
Diluted
Distributed earnings to common shareholders	18,251	16,203
Undistributed earnings allocated to common shareholders	35,294	23,686
Total common shareholders earnings, diluted	$ 53,545	$ 39,889
Weighted average common shares outstanding (in shares)	150,815	148,601
Effect of dilutive common stock awards (in shares)	3,054	853
Diluted weighted average common shares outstanding (in shares)	153,869	149,454
Basic earnings (loss) per common share (in usd per share)	$ 0.36	$ 0.27
Diluted earnings (loss) per common share (in usd per share)	$ 0.35	$ 0.27

Earnings Per Common Share (Text

Earnings Per Common Share (Textual) (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share Textuals [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	500,000	3,000,000
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants		4,000,000

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair value assumptions of stock options
Dividend yield	2.00%	2.50%
Risk-free interest rate	2.00%	2.00%
Weighted average expected volatility	25.00%	25.00%
Weighted average expected life	5 years 6 months	5 years 6 months
Weighted average per share fair value of stock options (in usd per share)	$ 5.30	$ 3.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	6,357,843
Granted (in shares)	799,558
Exercised (in shares)	(1,038,549)
Forfeited or expired (in shares)	(432,001)
Stock Options Shares Outstanding, Ending balance (in shares)	5,686,851	6,357,843
Options exercisable (in shares)	3,153,070
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 17.67
Granted, Weighted Average Exercise Price (in usd per share)	25.61
Exercised, Weighted Average Exercise Price (in usd per share)	16.28
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	33.74
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	18.07	$ 17.67
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 16.47
Stock Options Outstanding, Weighted Average Remaining Contractual Term	7 years	6 years 1 month 6 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 7 months 2 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 37,180	$ 47,902
Options exercisable, Aggregate Intrinsic Value	$ 25,258

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details)	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Beginning balance (in shares) | shares	2,377,380
Granted (in shares) | shares	729,135
Vested (in shares) | shares	(788,033)
Forfeited (in shares) | shares	(52,838)
Outstanding Shares, Ending balance (in shares) | shares	2,265,644
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance (in usd per share) | $ / shares	$ 17.40
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	25.59
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	17.87
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	17.92
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 19.86

Stock-Based Compensation (Detai

Stock-Based Compensation (Details Textuals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested share-based payment awards	$ 7,000
Stock Based Compensation (Textuals) [Abstract]
Intrinsic value of stock options exercised	10,000	$ 420
Total fair value of vested stock options	$ 3,000	$ 3,000
Service-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years	4 years
Performance-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for accelerated vesting of stock options	$ 450
Recognized compensation expense for vesting of stock options	$ 1,000	$ 1,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	fourth quarter 2020
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for accelerated vesting of stock options	$ 2,000
Recognized compensation expense for vesting of stock options	7,000	$ 7,000
Unvested share-based payment awards	$ 30,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	fourth quarter 2020

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment securities available for sale:
Amortized Cost	$ 4,342,007	$ 4,724,895
Gross Unrealized Gains	17,787	19,132
Gross Unrealized Losses	(59,304)	(63,801)
Fair Value	4,300,490	4,680,226
Investment securities held to maturity:
Amortized Cost	1,554,843	1,273,536
Gross Unrealized Gains	12,704	4,523
Gross Unrealized Losses	(17,225)	(13,385)
Fair Value	1,550,322	1,264,674
US Treasury Securities
Investment securities available for sale:
Amortized Cost	1,004	1,000
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	1,005	1,000
Obligations of state and political subdivisions (municipal securities)
Investment securities held to maturity:
Amortized Cost	1,131,526	1,145,843
Gross Unrealized Gains	7,150	3,868
Gross Unrealized Losses	(9,479)	(12,036)
Fair Value	1,129,197	1,137,675
Private Label
Investment securities available for sale:
Amortized Cost	1,118	1,134
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(16)	(14)
Fair Value	1,102	1,121
Investment securities held to maturity:
Amortized Cost	0
Fair Value	0
GNMA Commercial Mortgage-Related Securities
Investment securities available for sale:
Amortized Cost	1,696,287	2,064,508
Gross Unrealized Gains	145	356
Gross Unrealized Losses	(33,095)	(35,966)
Fair Value	1,663,337	2,028,898
Investment securities held to maturity:
Amortized Cost	296,232
Gross Unrealized Gains	5,005
Gross Unrealized Losses	(6,257)
Fair Value	294,980
Other Debt And Other Equity Securities
Investment securities available for sale:
Amortized Cost	4,718	4,718
Gross Unrealized Gains	94	105
Gross Unrealized Losses	(11)	(21)
Fair Value	4,801	4,802
FNMA and FHLMC | Residential Related Securities
Investment securities available for sale:
Amortized Cost	575,826	625,234
Gross Unrealized Gains	15,710	17,298
Gross Unrealized Losses	(1,117)	(2,602)
Fair Value	590,419	639,930
Investment securities held to maturity:
Amortized Cost	38,829	37,697
Gross Unrealized Gains	403	439
Gross Unrealized Losses	(727)	(693)
Fair Value	38,505	37,443
GNMA | Residential Related Securities
Investment securities available for sale:
Amortized Cost	2,063,054	2,028,301
Gross Unrealized Gains	1,837	1,372
Gross Unrealized Losses	(25,065)	(25,198)
Fair Value	2,039,826	2,004,475
Investment securities held to maturity:
Amortized Cost	88,256	89,996
Gross Unrealized Gains	146	216
Gross Unrealized Losses	(762)	(656)
Fair Value	$ 87,640	$ 89,556

Investment Securities, AFS an47

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
Available for Sale, Due in one year or less	$ 3,500
Available for Sale, Due after one year through five years	2,204
Available for Sale, Due after five years through ten years	0
Available for Sale, Due after ten years	0
Available for Sale, Total debt securities	5,704
Investment securities available for sale, amortized cost	4,342,007	$ 4,724,895
Fair Value
Available for Sale, Due in one year or less	3,489
Available for Sale, Due after one year through five years	2,205
Available for Sale, Due after five years through ten years	0
Available for Sale, Due after ten years	0
Available for Sale, Total debt securities	5,694
Investment securities available for sale, at fair value	$ 4,300,490	4,680,226
Ratio of Fair Value to Amortized Cost	99.00%
Amortized Cost
Held to Maturity, Due in one year or less	$ 41,148
Held to Maturity, Due after one year through five years	252,007
Held to Maturity, Due after five years through ten years	248,861
Held to Maturity, Due after ten years	589,510
Held to Maturity, Debt Securities, Amortized Cost Basis	1,131,526
Held to Maturity Amortized Cost	1,554,843	1,273,536
Fair Value
Held to Maturity, Due in one year or less	32,101
Held to Maturity, Due after one year through five years	259,468
Held to Maturity, Due after five years through ten years	250,081
Held to Maturity, Due after ten years	587,547
Held to Maturity, Securities, Debt Securities	1,129,197
Held to Maturity, Total debt securities	$ 1,550,322	1,264,674
Ratio of Fair Value to Amortized Cost	99.70%
Private Label
Amortized Cost
Investment securities available for sale, amortized cost	$ 1,118	1,134
Fair Value
Investment securities available for sale, at fair value	1,102	1,121
Amortized Cost
Held to Maturity Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities	0
GNMA Commercial Mortgage-Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	1,696,287	2,064,508
Fair Value
Investment securities available for sale, at fair value	1,663,337	2,028,898
Amortized Cost
Held to Maturity Amortized Cost	296,232
Fair Value
Held to Maturity, Total debt securities	294,980
Equity Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	18
Fair Value
Investment securities available for sale, at fair value	112
Amortized Cost
Held to Maturity Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities	0
FNMA and FHLMC | Residential Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	575,826	625,234
Fair Value
Investment securities available for sale, at fair value	590,419	639,930
Amortized Cost
Held to Maturity Amortized Cost	38,829	37,697
Fair Value
Held to Maturity, Total debt securities	38,505	37,443
GNMA | Residential Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	2,063,054	2,028,301
Fair Value
Investment securities available for sale, at fair value	2,039,826	2,004,475
Amortized Cost
Held to Maturity Amortized Cost	88,256	89,996
Fair Value
Held to Maturity, Total debt securities	$ 87,640	$ 89,556

Investment Securities, Gains, L

Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross gains	$ 0	$ 3,287
Gross losses	0	(189)
Total investment securities gains, net	0	3,098
Proceeds from sales of securities	$ 0	$ 119,379

Investment Securities, AFS an49

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2017USD ($)security	Dec. 31, 2016USD ($)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	$ (41,731)	$ (44,266)
Unrealized losses on available for sale securities, 12 months or more	(17,573)	(19,535)
Total unrealized losses on available for sale securities	(59,304)	(63,801)
Fair value of unrealized losses on available for sale securities, less than 12 months	3,070,774	3,397,143
Fair value of unrealized losses on available for sale securities, 12 months or more	369,824	430,377
Total fair value of unrealized losses on available for sale securities	$ 3,440,598	$ 3,827,520
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	145	145
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	20	22
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (15,018)	$ (13,034)
Unrealized losses on held to maturity securities, 12 months or more	(2,207)	(351)
Total unrealized losses on held to maturity securities	$ (17,225)	$ (13,385)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	7	5
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 680,421	$ 496,296
Fair value of unrealized losses on held to maturity securities, 12 months or more	47,119	7,783
Total fair value of unrealized losses on held to maturity securities	$ 727,540	$ 504,079
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	601	753
Obligations of state and political subdivisions (municipal securities)
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (9,407)	$ (11,937)
Unrealized losses on held to maturity securities, 12 months or more	(72)	(99)
Total unrealized losses on held to maturity securities	(9,479)	(12,036)
Fair value of unrealized losses on held to maturity securities, less than 12 months	342,534	414,186
Fair value of unrealized losses on held to maturity securities, 12 months or more	1,778	1,752
Total fair value of unrealized losses on held to maturity securities	$ 344,312	$ 415,938
Obligations of state and political subdivisions (municipal securities) | 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	538	700
Obligations of state and political subdivisions (municipal securities) | 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	4	4
Private Label
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	$ 0
Unrealized losses on available for sale securities, 12 months or more	(16)	(14)
Total unrealized losses on available for sale securities	(16)	(14)
Fair value of unrealized losses on available for sale securities, less than 12 months	0	0
Fair value of unrealized losses on available for sale securities, 12 months or more	1,100	1,119
Total fair value of unrealized losses on available for sale securities	$ 1,100	$ 1,119
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	0	0
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	1	1
GNMA Commercial Mortgage-Related Securities
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	$ (15,538)	$ (16,445)
Unrealized losses on available for sale securities, 12 months or more	(17,557)	(19,521)
Total unrealized losses on available for sale securities	(33,095)	(35,966)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,214,494	1,427,889
Fair value of unrealized losses on available for sale securities, 12 months or more	368,724	429,258
Total fair value of unrealized losses on available for sale securities	$ 1,583,218	$ 1,857,147
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	73	74
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	19	21
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (4,369)
Unrealized losses on held to maturity securities, 12 months or more	(1,888)
Total unrealized losses on held to maturity securities	(6,257)
Fair value of unrealized losses on held to maturity securities, less than 12 months	255,424
Fair value of unrealized losses on held to maturity securities, 12 months or more	39,556
Total fair value of unrealized losses on held to maturity securities	$ 294,980
GNMA Commercial Mortgage-Related Securities | 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	9
GNMA Commercial Mortgage-Related Securities | 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	2
Other Debt And Other Equity Securities
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	$ (11)	$ (21)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(11)	(21)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,489	1,479
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 1,489	$ 1,479
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	3	3
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	0
FNMA and FHLMC | Residential Related Securities
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	$ (1,117)	$ (2,602)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(1,117)	(2,602)
Fair value of unrealized losses on available for sale securities, less than 12 months	216,103	244,252
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 216,103	$ 244,252
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	13	14
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (480)	$ (441)
Unrealized losses on held to maturity securities, 12 months or more	(247)	(252)
Total unrealized losses on held to maturity securities	(727)	(693)
Fair value of unrealized losses on held to maturity securities, less than 12 months	19,969	17,477
Fair value of unrealized losses on held to maturity securities, 12 months or more	5,785	6,031
Total fair value of unrealized losses on held to maturity securities	$ 25,754	$ 23,508
FNMA and FHLMC | Residential Related Securities | 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	16	14
FNMA and FHLMC | Residential Related Securities | 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	1	1
GNMA | Residential Related Securities
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	$ (25,065)	$ (25,198)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(25,065)	(25,198)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,638,688	1,723,523
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 1,638,688	$ 1,723,523
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	56	54
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (762)	$ (656)
Unrealized losses on held to maturity securities, 12 months or more	0	0
Total unrealized losses on held to maturity securities	(762)	(656)
Fair value of unrealized losses on held to maturity securities, less than 12 months	62,494	64,633
Fair value of unrealized losses on held to maturity securities, 12 months or more	0	0
Total fair value of unrealized losses on held to maturity securities	$ 62,494	$ 64,633
GNMA | Residential Related Securities | 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	38	39
GNMA | Residential Related Securities | 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	0	0

Investment Securities (Details

Investment Securities (Details Textual) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Investment Securities (Textuals) [Abstract]
Available-for-sale Securities, Transferred to Held-to-maturity Securities, at Carrying Value	$ 300
Securities pledged as collateral	2,100	$ 1,800
Federal Home Loan Bank Stock	64	65
Federal Reserve Bank Stock	$ 75	$ 75

Loans, Loan Composition (Detail

Loans, Loan Composition (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 20,147,683	$ 20,054,716
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	6,300,646	6,489,014
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans	878,391	897,724
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,179,037	7,386,738
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Total loans	3,415,355	3,574,732
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,553,205	1,432,497
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	4,968,560	5,007,229
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	12,147,597	12,393,967
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans	6,715,282	6,332,327
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	911,969	934,443
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	372,835	393,979
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 8,000,086	$ 7,660,749

Loans Loans, Loans by Credit Qu

Loans Loans, Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 20,147,683	$ 20,054,716
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	19,415,238	19,251,353
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	132,797	176,918
Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	339,657	351,142
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	259,991	275,303
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,300,646	6,489,014
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,816,591	5,937,119
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	100,234	141,328
Commercial and industrial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	218,930	227,196
Commercial and industrial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	164,891	183,371
Commercial real estate — owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	878,391	897,724
Commercial real estate — owner occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	793,177	805,871
Commercial real estate — owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,295	17,785
Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	58,994	64,524
Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	17,925	9,544
Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,179,037	7,386,738
Commercial and business lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,609,768	6,742,990
Commercial and business lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	108,529	159,113
Commercial and business lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	277,924	291,720
Commercial and business lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	182,816	192,915
Commercial real estate — investor
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,415,355	3,574,732
Commercial real estate — investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,336,105	3,491,217
Commercial real estate — investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	21,760	14,236
Commercial real estate — investor | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	49,217	51,228
Commercial real estate — investor | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,273	18,051
Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,553,205	1,432,497
Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,541,779	1,429,083
Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	38	105
Real estate construction | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,141	2,465
Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,247	844
Commercial real estate lending
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,968,560	5,007,229
Commercial real estate lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,877,884	4,920,300
Commercial real estate lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	21,798	14,341
Commercial real estate lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	59,358	53,693
Commercial real estate lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	9,520	18,895
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	12,147,597	12,393,967
Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,487,652	11,663,290
Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	130,327	173,454
Total commercial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	337,282	345,413
Total commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	192,336	211,810
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,715,282	6,332,327
Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,658,070	6,275,162
Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	874	1,314
Residential mortgage | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,155	5,615
Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	54,183	50,236
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	911,969	934,443
Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	897,452	919,740
Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,085	1,588
Home equity | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	220	114
Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,212	13,001
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	372,835	393,979
Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	372,064	393,161
Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	511	562
Other consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	260	256
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,000,086	7,660,749
Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,927,586	7,588,063
Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,470	3,464
Total consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,375	5,729
Total consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 67,655	$ 63,493

Loans, Loans by Past Due Status

Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Summarized details of Loans
Current	$ 19,868,361	$ 19,756,523
Nonaccrual	259,991	275,303
Total loans	20,147,683	20,054,716
Accruing loans past due 90 days or more	2,000	2,000
Nonaccrual Loans, Current Portion	$ 194,000	$ 224,000
Percent of current nonaccrual loans	75.00%	81.00%
30-59 Days Past Due
Summarized details of Loans
Total Past Due	$ 11,222	$ 16,662
60-89 Days Past Due
Summarized details of Loans
Total Past Due	6,389	4,615
90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,720	1,613
Commercial and industrial
Summarized details of Loans
Current	6,133,822	6,303,994
Nonaccrual	164,891	183,371
Total loans	6,300,646	6,489,014
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	752	965
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	923	448
Commercial and industrial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	258	236
Commercial real estate — owner occupied
Summarized details of Loans
Current	859,496	886,796
Nonaccrual	17,925	9,544
Total loans	878,391	897,724
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	500	968
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	470	416
Commercial real estate — owner occupied | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial and business lending
Summarized details of Loans
Current	6,993,318	7,190,790
Nonaccrual	182,816	192,915
Total loans	7,179,037	7,386,738
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,252	1,933
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,393	864
Commercial and business lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	258	236
Commercial real estate — investor
Summarized details of Loans
Current	3,405,960	3,555,750
Nonaccrual	8,273	18,051
Total loans	3,415,355	3,574,732
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	920	431
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	202	500
Commercial real estate — investor | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Real estate construction
Summarized details of Loans
Current	1,551,527	1,431,284
Nonaccrual	1,247	844
Total loans	1,553,205	1,432,497
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	393	264
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	38	105
Real estate construction | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial real estate lending
Summarized details of Loans
Current	4,957,487	4,987,034
Nonaccrual	9,520	18,895
Total loans	4,968,560	5,007,229
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,313	695
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	240	605
Commercial real estate lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Total commercial
Summarized details of Loans
Current	11,950,805	12,177,824
Nonaccrual	192,336	211,810
Total loans	12,147,597	12,393,967
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,565	2,628
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,633	1,469
Total commercial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	258	236
Residential mortgage
Summarized details of Loans
Current	6,653,856	6,273,949
Nonaccrual	54,183	50,236
Total loans	6,715,282	6,332,327
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	4,238	7,298
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	3,005	844
Residential mortgage | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Home equity
Summarized details of Loans
Current	894,245	915,593
Nonaccrual	13,212	13,001
Total loans	911,969	934,443
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,406	4,265
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,106	1,584
Home equity | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Other consumer
Summarized details of Loans
Current	369,455	389,157
Nonaccrual	260	256
Total loans	372,835	393,979
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,013	2,471
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	645	718
Other consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,462	1,377
Total consumer
Summarized details of Loans
Current	7,917,556	7,578,699
Nonaccrual	67,655	63,493
Total loans	8,000,086	7,660,749
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	8,657	14,034
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	4,756	3,146
Total consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,462	$ 1,377

Loans, Impaired Loans Recorded

Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 339,050	$ 355,160
Unpaid Principal Balance	365,588	394,588
Related Allowance	50,884	46,483
Average Recorded Investment	347,731	378,277
Interest Income Recognized	$ 1,826	$ 10,228
Net Recorded Investment of the Impaired Loans	79.00%	78.00%
Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 244,990	$ 221,012
Unpaid Principal Balance	265,352	236,876
Related Allowance	50,884	46,483
Average Recorded Investment	251,603	237,729
Interest Income Recognized	1,665	8,383
Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	94,060	134,148
Unpaid Principal Balance	100,236	157,712
Related Allowance	0	0
Average Recorded Investment	96,128	140,548
Interest Income Recognized	161	1,845
Commercial and industrial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	195,743	215,255
Unpaid Principal Balance	210,273	242,676
Related Allowance	26,686	21,617
Average Recorded Investment	203,675	229,191
Interest Income Recognized	398	4,031
Commercial and industrial | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	124,408	101,770
Unpaid Principal Balance	135,061	107,813
Related Allowance	26,686	21,617
Average Recorded Investment	130,361	111,211
Interest Income Recognized	305	2,512
Commercial and industrial | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	71,335	113,485
Unpaid Principal Balance	75,212	134,863
Related Allowance	0	0
Average Recorded Investment	73,314	117,980
Interest Income Recognized	93	1,519
Commercial real estate — owner occupied
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	23,457	15,034
Unpaid Principal Balance	26,242	17,907
Related Allowance	1,766	295
Average Recorded Investment	23,627	15,870
Interest Income Recognized	113	412
Commercial real estate — owner occupied | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	14,918	6,595
Unpaid Principal Balance	16,833	8,641
Related Allowance	1,766	295
Average Recorded Investment	15,045	7,111
Interest Income Recognized	113	274
Commercial real estate — owner occupied | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	8,539	8,439
Unpaid Principal Balance	9,409	9,266
Related Allowance	0	0
Average Recorded Investment	8,582	8,759
Interest Income Recognized	0	138
Commercial and business lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	219,200	230,289
Unpaid Principal Balance	236,515	260,583
Related Allowance	28,452	21,912
Average Recorded Investment	227,302	245,061
Interest Income Recognized	511	4,443
Commercial and business lending | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	139,326	108,365
Unpaid Principal Balance	151,894	116,454
Related Allowance	28,452	21,912
Average Recorded Investment	145,406	118,322
Interest Income Recognized	418	2,786
Commercial and business lending | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	79,874	121,924
Unpaid Principal Balance	84,621	144,129
Related Allowance	0	0
Average Recorded Investment	81,896	126,739
Interest Income Recognized	93	1,657
Commercial real estate — investor
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	22,836	33,340
Unpaid Principal Balance	23,716	34,155
Related Allowance	319	3,541
Average Recorded Investment	22,913	38,234
Interest Income Recognized	371	2,124
Commercial real estate — investor | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	16,018	27,196
Unpaid Principal Balance	16,497	27,677
Related Allowance	319	3,541
Average Recorded Investment	16,060	31,142
Interest Income Recognized	371	2,124
Commercial real estate — investor | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,818	6,144
Unpaid Principal Balance	7,219	6,478
Related Allowance	0	0
Average Recorded Investment	6,853	7,092
Interest Income Recognized	0	0
Real estate construction
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,574	1,203
Unpaid Principal Balance	1,888	1,566
Related Allowance	533	441
Average Recorded Investment	1,594	1,321
Interest Income Recognized	32	67
Real estate construction | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,349	1,203
Unpaid Principal Balance	1,663	1,566
Related Allowance	533	441
Average Recorded Investment	1,369	1,321
Interest Income Recognized	32	67
Real estate construction | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	225	0
Unpaid Principal Balance	225	0
Related Allowance	0	0
Average Recorded Investment	225	0
Interest Income Recognized	0	0
Commercial real estate lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	24,410	34,543
Unpaid Principal Balance	25,604	35,721
Related Allowance	852	3,982
Average Recorded Investment	24,507	39,555
Interest Income Recognized	403	2,191
Commercial real estate lending | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	17,367	28,399
Unpaid Principal Balance	18,160	29,243
Related Allowance	852	3,982
Average Recorded Investment	17,429	32,463
Interest Income Recognized	403	2,191
Commercial real estate lending | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	7,043	6,144
Unpaid Principal Balance	7,444	6,478
Related Allowance	0	0
Average Recorded Investment	7,078	7,092
Interest Income Recognized	0	0
Total commercial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	243,610	264,832
Unpaid Principal Balance	262,119	296,304
Related Allowance	29,304	25,894
Average Recorded Investment	251,809	284,616
Interest Income Recognized	914	6,634
Total commercial | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	156,693	136,764
Unpaid Principal Balance	170,054	145,697
Related Allowance	29,304	25,894
Average Recorded Investment	162,835	150,785
Interest Income Recognized	821	4,977
Total commercial | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	86,917	128,068
Unpaid Principal Balance	92,065	150,607
Related Allowance	0	0
Average Recorded Investment	88,974	133,831
Interest Income Recognized	93	1,657
Residential mortgage
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	72,718	68,336
Unpaid Principal Balance	78,534	74,088
Related Allowance	11,860	11,091
Average Recorded Investment	73,002	70,435
Interest Income Recognized	656	2,447
Residential mortgage | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	66,221	62,362
Unpaid Principal Balance	71,013	67,090
Related Allowance	11,860	11,091
Average Recorded Investment	66,495	63,825
Interest Income Recognized	588	2,263
Residential mortgage | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,497	5,974
Unpaid Principal Balance	7,521	6,998
Related Allowance	0	0
Average Recorded Investment	6,507	6,610
Interest Income Recognized	68	184
Home equity
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,421	20,757
Unpaid Principal Balance	23,608	22,912
Related Allowance	9,528	9,312
Average Recorded Investment	21,611	21,932
Interest Income Recognized	250	1,118
Home equity | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,775	20,651
Unpaid Principal Balance	22,958	22,805
Related Allowance	9,528	9,312
Average Recorded Investment	20,964	21,825
Interest Income Recognized	250	1,114
Home equity | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	646	106
Unpaid Principal Balance	650	107
Related Allowance	0	0
Average Recorded Investment	647	107
Interest Income Recognized	0	4
Other consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,301	1,235
Unpaid Principal Balance	1,327	1,284
Related Allowance	192	186
Average Recorded Investment	1,309	1,294
Interest Income Recognized	6	29
Other consumer | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,301	1,235
Unpaid Principal Balance	1,327	1,284
Related Allowance	192	186
Average Recorded Investment	1,309	1,294
Interest Income Recognized	6	29
Other consumer | Loans with no related allowance
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
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Total consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	95,440	90,328
Unpaid Principal Balance	103,469	98,284
Related Allowance	21,580	20,589
Average Recorded Investment	95,922	93,661
Interest Income Recognized	912	3,594
Total consumer | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	88,297	84,248
Unpaid Principal Balance	95,298	91,179
Related Allowance	21,580	20,589
Average Recorded Investment	88,768	86,944
Interest Income Recognized	844	3,406
Total consumer | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	7,143	6,080
Unpaid Principal Balance	8,171	7,105
Related Allowance	0	0
Average Recorded Investment	7,154	6,717
Interest Income Recognized	$ 68	$ 188

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 79,059	$ 79,857
Nonaccrual Restructured Loans	78,902	29,385
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	30,852	31,884
Nonaccrual Restructured Loans	52,079	1,276
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	5,532	5,490
Nonaccrual Restructured Loans	2,148	2,220
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	14,563	15,289
Nonaccrual Restructured Loans	1,643	924
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	327	359
Nonaccrual Restructured Loans	170	150
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	18,535	18,100
Nonaccrual Restructured Loans	20,457	21,906
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	8,209	7,756
Nonaccrual Restructured Loans	2,379	2,877
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,041	979
Nonaccrual Restructured Loans	$ 26	$ 32

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	53	59
Recorded Investment	$ 54,911	$ 4,498
Unpaid Principal Balance	$ 63,163	$ 4,710
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	20	7
Recorded Investment	$ 52,326	$ 1,483
Unpaid Principal Balance	$ 60,546	$ 1,522
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	1
Recorded Investment	$ 204	$ 125
Unpaid Principal Balance	$ 204	$ 130
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Recorded Investment	$ 733	$ 0
Unpaid Principal Balance	$ 744	$ 0
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Recorded Investment	$ 0	$ 10
Unpaid Principal Balance	$ 0	$ 55
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	16	30
Recorded Investment	$ 1,301	$ 2,062
Unpaid Principal Balance	$ 1,322	$ 2,124
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	15	20
Recorded Investment	$ 347	$ 818
Unpaid Principal Balance	$ 347	$ 879

Loans, Troubled Debt Restruct57

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	8	16
Recorded Investment | $	$ 409	$ 1,314
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Recorded Investment | $	$ 0	$ 10
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	6	7
Recorded Investment | $	$ 383	$ 1,151
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	8
Recorded Investment | $	$ 26	$ 153

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	$ 278,335	$ 274,264
Charge offs	(11,854)	(86,439)
Recoveries	6,191	21,510
Net charge offs	(5,663)	(64,929)
Provision for loan losses	10,000	69,000
Balance at end of period	282,672	278,335
Allowance for loan losses:
Individually evaluated for impairment	28,365	24,103
Collectively evaluated for impairment	254,307	254,232
Balance at end of period	282,672	278,335
Loans:
Individually evaluated for impairment	199,459	214,409
Collectively evaluated for impairment	19,948,224	19,840,307
Total loans	20,147,683	20,054,716
Commercial and industrial
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	140,126	129,959
Charge offs	(9,359)	(71,016)
Recoveries	4,991	14,543
Net charge offs	(4,368)	(56,473)
Provision for loan losses	10,509	66,640
Balance at end of period	146,267	140,126
Allowance for loan losses:
Individually evaluated for impairment	25,915	20,836
Collectively evaluated for impairment	120,352	119,290
Balance at end of period	146,267	140,126
Loans:
Individually evaluated for impairment	162,788	180,965
Collectively evaluated for impairment	6,137,858	6,308,049
Total loans	6,300,646	6,489,014
Commercial real estate — owner occupied
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	14,034	18,680
Charge offs	(5)	(512)
Recoveries	24	74
Net charge offs	19	(438)
Provision for loan losses	(2,841)	(4,208)
Balance at end of period	11,212	14,034
Allowance for loan losses:
Individually evaluated for impairment	1,541	0
Collectively evaluated for impairment	9,671	14,034
Balance at end of period	11,212	14,034
Loans:
Individually evaluated for impairment	17,098	8,439
Collectively evaluated for impairment	861,293	889,285
Total loans	878,391	897,724
Commercial real estate — investor
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	45,285	43,018
Charge offs	(633)	(1,504)
Recoveries	119	1,624
Net charge offs	(514)	120
Provision for loan losses	(3,406)	2,147
Balance at end of period	41,365	45,285
Allowance for loan losses:
Individually evaluated for impairment	99	3,117
Collectively evaluated for impairment	41,266	42,168
Balance at end of period	41,365	45,285
Loans:
Individually evaluated for impairment	7,615	17,322
Collectively evaluated for impairment	3,407,740	3,557,410
Total loans	3,415,355	3,574,732
Real estate construction
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	26,932	25,266
Charge offs	(23)	(558)
Recoveries	34	203
Net charge offs	11	(355)
Provision for loan losses	1,825	2,021
Balance at end of period	28,768	26,932
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	28,768	26,932
Balance at end of period	28,768	26,932
Loans:
Individually evaluated for impairment	225	0
Collectively evaluated for impairment	1,552,980	1,432,497
Total loans	1,553,205	1,432,497
Residential mortgage
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	27,046	28,261
Charge offs	(297)	(4,332)
Recoveries	169	755
Net charge offs	(128)	(3,577)
Provision for loan losses	3,370	2,362
Balance at end of period	30,288	27,046
Allowance for loan losses:
Individually evaluated for impairment	810	147
Collectively evaluated for impairment	29,478	26,899
Balance at end of period	30,288	27,046
Loans:
Individually evaluated for impairment	11,086	7,033
Collectively evaluated for impairment	6,704,196	6,325,294
Total loans	6,715,282	6,332,327
Home equity
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	20,364	23,555
Charge offs	(509)	(4,686)
Recoveries	682	3,491
Net charge offs	173	(1,195)
Provision for loan losses	(223)	(1,996)
Balance at end of period	20,314	20,364
Allowance for loan losses:
Individually evaluated for impairment	0	3
Collectively evaluated for impairment	20,314	20,361
Balance at end of period	20,314	20,364
Loans:
Individually evaluated for impairment	647	650
Collectively evaluated for impairment	911,322	933,793
Total loans	911,969	934,443
Other consumer
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	4,548	5,525
Charge offs	(1,028)	(3,831)
Recoveries	172	820
Net charge offs	(856)	(3,011)
Provision for loan losses	766	2,034
Balance at end of period	4,458	4,548
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,458	4,548
Balance at end of period	4,458	4,548
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	372,835	393,979
Total loans	$ 372,835	$ 393,979

Loans, Changes in the Allowan59

Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Change in the allowance for unfunded commitments
Balance at beginning of period	$ 25,000
Balance at end of period	24,000	$ 25,000
Allowance for Unfunded Commitments:
Change in the allowance for unfunded commitments
Balance at beginning of period	25,400	24,400
Provision for unfunded commitments	(1,000)	1,000
Balance at end of period	$ 24,400	$ 25,400

Loans (Details Textuals)

Loans (Details Textuals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Receivables [Abstract]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 54,911	$ 4,498
Restructured Loans Subsequently Accruing	1,000
Ytd Restructured Loans Still On Nonaccrual	$ 54,000

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Summary of core deposit intangibles and other intangibles
Additions during the period	$ 162	$ 1,000
Amortization of other intangible assets	513	$ 504
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	4,385		$ 4,385
Accumulated amortization	(4,340)		(4,273)
Total Estimated Amortization Expense	45		112
Amortization of other intangible assets	67		281
Other Intangible Assets
Summary of core deposit intangibles and other intangibles
Gross carrying amount	32,572		32,410
Accumulated amortization	(17,591)		(17,145)
Total Estimated Amortization Expense	14,981		15,265
Additions during the period	162		1,012
Amortization of other intangible assets	$ 446		$ 1,812

Goodwill and Intangible Asset62

Goodwill and Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Mortgage servicing rights:
Mortgage servicing rights at beginning of period	$ 62,085	$ 62,150
Additions	1,920	12,262
Amortization	(2,477)	(12,327)
Mortgage servicing rights at end of period	61,528	62,085
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period	(609)	(809)
(Additions) recoveries, net	(217)	200
Valuation allowance at end of period	(826)	(609)
Mortgage servicing rights, net	60,702	61,476
Fair value of mortgage servicing rights	68,037	73,149
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,908,799	$ 7,974,742
Mortgage servicing rights, net to servicing portfolio	0.77%	0.77%
Mortgage servicing rights expense	$ 2,694	$ 12,127

Goodwill and Intangible Asset63

Goodwill and Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Core Deposit Intangibles
Estimated future amortization expense
Nine months ending December 31, 2017	$ 45
Year ending December 31, 2018	0
Year ending December 31, 2019	0
Year ending December 31, 2020	0
Year ending December 31, 2021	0
Year ending December 31, 2022	0
Beyond 2,022	0
Total Estimated Amortization Expense	45	$ 112
Other Intangible Assets
Estimated future amortization expense
Nine months ending December 31, 2017	1,351
Year ending December 31, 2018	1,771
Year ending December 31, 2019	1,472
Year ending December 31, 2020	1,355
Year ending December 31, 2021	1,331
Year ending December 31, 2022	1,308
Beyond 2,022	6,393
Total Estimated Amortization Expense	14,981	$ 15,265
Mortgage Servicing Rights
Estimated future amortization expense
Nine months ending December 31, 2017	7,275
Year ending December 31, 2018	8,389
Year ending December 31, 2019	7,100
Year ending December 31, 2020	6,025
Year ending December 31, 2021	5,128
Year ending December 31, 2022	4,385
Beyond 2,022	23,226
Total Estimated Amortization Expense	$ 61,528

Goodwill and Intangible Asset64

Goodwill and Intangible Assets (Details Textuals) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)acquisition	Mar. 31, 2016USD ($)acquisition	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill acquired during period	$ 55	$ 3,000
Additions to finite-lived intangible assets	$ 162	$ 1,000
Number of Acquisitions | acquisition	1	2
Goodwill	$ 972,006		$ 971,951

Short and Long-Term Funding (Co

Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Short-term Funding [Abstract]
Federal funds purchased		$ 323,365	$ 208,150
Securities sold under agreements to repurchase		326,823	300,197
Federal funds purchased and securities sold under agreements to repurchase		650,188	508,347
FHLB advances		309,000	482,000
Commercial paper		121,679	101,688
Other short-term funding		430,679	583,688
Total short-term funding		1,080,867	1,092,035
Long-term Funding
FHLB advances		2,265,180	2,265,188
Senior notes, at par		250,000	250,000
Subordinated notes, at par		250,000	250,000
Other long-term funding and capitalized costs		(3,225)	(3,393)
Total long-term funding	[1]	2,761,955	2,761,795
Total short and long-term funding		$ 3,842,822	$ 3,853,830
[1]	(1)Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements.

Short and Long-Term Funding (Re

Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 326,823	$ 300,197
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	326,823	300,197
Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	326,823	300,197
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	326,823	300,197
Agency mortgage-related securities | Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | 30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 0	$ 0

Short and Long-Term Funding (Lo

Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2014	Mar. 31, 2017	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed		$ 481
Federal Home Loan Bank, Advances, Weighted Average Interest Rate		0.68%	0.50%
Two Thousand Fourteen Senior Notes
Subordinated Borrowing [Line Items]
New Senior Debt Issued	$ 250
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Two Thousand Fourteen Subordinated Notes
Subordinated Borrowing [Line Items]
Junior Subordinated Debentures Issued	$ 250
Debt Instrument, Term	10 years
Subordinated Borrowing, Interest Rate	4.25%

Derivative and Hedging Activi68

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Trading assets | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 2,098,658	$ 2,039,323
Fair Value	31,841	33,671
Trading assets | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	83,012	109,675
Fair Value	812	2,002
Trading assets | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	301,425	127,582
Fair Value	16,653	16,725
Trading liabilities | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,098,658	2,039,323
Fair Value	(31,113)	(33,188)
Trading liabilities | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	80,227	106,251
Fair Value	(774)	(1,943)
Trading liabilities | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	300,011	128,368
Fair Value	(15,674)	(15,972)
Other assets | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	291,674	285,345
Fair Value	1,803	206
Other assets | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount		179,600
Fair Value		2,908
Other assets | Purchased options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	80,116	80,554
Fair Value	2,290	2,576
Other liabilities | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	100,750
Fair Value	(373)
Other liabilities | Written options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	80,116	80,554
Fair Value	$ (2,290)	$ (2,576)

Derivative and Hedging Activi69

Derivative and Hedging Activities, Income Statement Category of the Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Capital market fees, net | Interest rate-related instruments — customer and mirror
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ 245	$ (870)
Capital market fees, net | Foreign currency exchange forwards
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	(21)	(28)
Capital market fees, net | Commodity contracts
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	226	0
Mortgage banking, net | Interest rate lock commitments (mortgage)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	1,597	1,731
Mortgage banking, net | Forward commitments (mortgage)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ (3,281)	$ (2,135)

Derivative and Hedging Activi70

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 25	$ 40
Derivative collateral right to reclaim cash	$ 0	$ 0

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest and commodity agreements - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 23,374	$ 18,031
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	23,374	18,031
Financial instruments	(19,022)	(18,031)
Collateral	(4,352)	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	19,022	31,075
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	19,022	31,075
Financial instruments	(19,022)	(18,031)
Collateral	0	(11,148)
Net amount	$ 0	$ 1,896

Commitments, Off-Balance Shee72

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 0	$ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale
Summary of lending-related and other commitments
Lending related commitments	8,041,839	8,131,131
Commercial Letters Of Credit
Summary of lending-related and other commitments
Lending related commitments	7,490	7,923
Standby Letters of Credit
Summary of lending-related and other commitments
Lending related commitments	268,612	259,632
Standby letters of credit, fair value	$ 3,000	$ 3,000

Commitments, Off-Balance Shee73

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings Residential Mortgage Repurchase Reserve (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Residential mortgage repurchase reserve
Balance at beginning of period	$ 25,000
Balance at end of period	24,000	$ 25,000
Mortgage Repurchase Reserve
Residential mortgage repurchase reserve
Balance at beginning of period	900	1,197
Repurchase provision expense	59	456
Adjustments to provision expense	0	(750)
Charge offs, net	0	(3)
Balance at end of period	$ 959	$ 900

Commitments, Off-Balance Shee74

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Details Textuals) $ in Thousands	Jan. 11, 2016USD ($)complaint	May 22, 2015USD ($)loan_production_officebranch	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
unfunded commitments			$ 24,000	$ 25,000
Carrying value of investments			111,000	85,000
Commitments under unconsolidated projects			80,000	69,000
Commitment term		3 years
Mortgage loan commitment		$ 196,000
Number of branch opening commitments | branch		1
Number of loan production offices | loan_production_office		4
Conciliation agreement cost, commitment term		4 years
Number of complaints filed under legal proceedings | complaint	2
Loans repurchased under make whole requests			112	2,000
Loans sold to outside investors original amount			9,400,000
Loans sold to outside investors remaining outstanding amount			6,100,000
Residential mortgage loans sold with recourse risk			45,000	62,000
Residential mortgage loans sold with credit recourse risk			$ 92,000	$ 98,000
The Official Committee of Unsecured Creditors of World Marketing Chicago LLC v Associated Bank [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Damages sought	$ 6,000
Damages sought, cash	4,000
American Funds Service Company v Associated Bank [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Damages sought	$ 600

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment securities available for sale:
Investment securities available for sale	$ 4,300,490	$ 4,680,226
Trading assets	49,306	52,398
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	47,561	51,103
Fair Value, Inputs, Level 1
Investment securities available for sale:
Investment securities available for sale	2,606	2,602
Fair Value, Inputs, Level 2
Investment securities available for sale:
Investment securities available for sale	4,297,884	4,677,424
Trading assets	51,596	54,974
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	49,851	53,679
Fair Value, Inputs, Level 3
Investment securities available for sale:
Investment securities available for sale	0	200
Trading assets	1,803	3,114
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	373	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities
Investment securities available for sale:
Investment securities available for sale	1,005	1,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities
Investment securities available for sale:
Investment securities available for sale	1,601	1,602
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Total investment securities available for sale
Investment securities available for sale:
Investment securities available for sale	2,606	2,602
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Investment securities available for sale:
Investment securities available for sale	590,419	639,930
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA
Investment securities available for sale:
Investment securities available for sale	2,039,826	2,004,475
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private Label
Investment securities available for sale:
Investment securities available for sale	1,102	1,121
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA Commercial Mortgage-Related Securities
Investment securities available for sale:
Investment securities available for sale	1,663,337	2,028,898
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities
Investment securities available for sale:
Investment securities available for sale	3,200	3,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale
Investment securities available for sale:
Investment securities available for sale	4,297,884	4,677,424
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Loans Held For Sale Member
Investment securities available for sale:
Trading assets	34,051	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror
Investment securities available for sale:
Trading assets	31,841	33,671
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	31,113	33,188
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Investment securities available for sale:
Trading assets	812	2,002
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	774	1,943
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Investment securities available for sale:
Trading assets	16,653	16,725
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	15,674	15,972
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)
Investment securities available for sale:
Trading assets	2,290	2,576
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	2,290	2,576
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Other Debt And Other Equity Securities
Investment securities available for sale:
Investment securities available for sale	0	200
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Total investment securities available for sale
Investment securities available for sale:
Investment securities available for sale	0	200
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage)
Investment securities available for sale:
Trading assets	1,803	206
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Investment securities available for sale:
Trading assets	0	2,908
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	$ 373	$ 0

Fair Value Measurements, Asse76

Fair Value Measurements, Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Total investment securities available for sale
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 200	$ 200
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(200)
Ending Balance	0	200
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Mortgage derivative loss	0	0
Derivative Financial Instruments
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	3,114	1,361
Mortgage derivative loss	(1,684)	1,753
Ending Balance	$ 1,430	$ 3,114

Fair Value Measurements, Asse77

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 60,702		$ 61,476
Mortgage Servicing Rights (MSR) Impairment (Recovery)	217	$ 909
Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Commercial Loans Held-for-sale, Fair Value Disclosure	2,901		12,474
Residential Held-for-sale, Fair Value Disclosure	34,051		108,010
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Commercial Loans Held-for-sale, Fair Value Disclosure	2,901		12,474
Provision for Credit Losses, Commercial Loans held-for-sale	0		(559)
Residential Held-for-sale, Fair Value Disclosure			108,010
Mortgage banking, net			(3,760)
Other Real Estate Owned Fair Value Disclosure	921		9,752
Foreclosure / OREO expense, net	(583)		(1,091)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Impaired loans	93,552		79,270
Provision for Credit Losses, Impaired Loans	(25,785)		(75,194)
Mortgage servicing rights	68,037		73,149
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ (217)		$ 200

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Financial assets
Cash and due from banks		$ 332,601	$ 446,558
Interest-bearing deposits in other financial institutions		337,167	149,175
Federal funds sold and securities purchased under agreements to resell		19,700	46,500
Investment securities held to maturity		1,554,843	1,273,536
Investment securities held to maturity, fair value		1,550,322	1,264,674
Investment securities available for sale		4,300,490	4,680,226
FHLB and Federal Reserve Bank stocks		139,273	140,001
Commercial loans held for sale		2,901	12,474
Loans, net		19,865,011	19,776,381
Derivatives (trading and other assets)		49,306	52,398
Financial liabilities
Short-term funding		1,080,867	1,092,035
Long-term funding	[1]	2,761,955	2,761,795
Derivatives (trading and other liabilities)		47,561	51,103
Letters of Credit Outstanding, Amount		269,000	260,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks		332,601	446,558
Cash and due from banks, Fair Value		332,601	446,558
Interest-bearing deposits in other financial institutions		337,167	149,175
Interest-bearing deposits in other financial institutions, fair value		337,167	149,175
Federal funds sold and securities purchased under agreements to resell		19,700	46,500
Federal funds sold and securities purchased under agreements to resell, fair value		19,700	46,500
Investment securities available for sale		2,606	2,602
Investment securities available for sale, at fair value		2,606	2,602
Fair Value, Inputs, Level 2
Financial assets
Investment securities held to maturity		1,554,843	1,273,536
Investment securities held to maturity, fair value		1,550,322	1,264,674
Investment securities available for sale		4,297,884	4,677,424
Investment securities available for sale, at fair value		4,297,884	4,677,424
FHLB and Federal Reserve Bank stocks		139,273	140,001
Federal Home Loan Bank and Federal Reserve Bank stocks, fair value		139,273	140,001
Commercial loans held for sale		2,901	12,474
Commercial Loans Held-for-sale, Fair Value Disclosure		2,901	12,474
Residential Loans on Real Estate, Carrying Amount of Mortgages		34,051	108,010
Residential Held-for-sale, Fair Value Disclosure		34,051	108,010
Bank owned life insurance		587,600	585,290
Bank owned life insurance, fair value		587,600	585,290
Derivatives (trading and other assets)		51,596	54,974
Derivatives (trading and other assets), fair value		51,596	54,974
Financial liabilities
Brokered CDs and other time deposits		1,614,909	1,606,127
Brokered CDs and other time deposits, fair value		1,614,909	1,606,127
Short-term funding		1,080,867	1,092,035
Short-term funding, fair value		1,080,867	1,092,035
Long-term funding		2,761,955	2,761,795
Long-term funding, fair value		2,790,093	2,791,841
Standby letters of credit		2,648	2,566
Standby letters of credit, fair value		2,648	2,566
Derivatives (trading and other liabilities)		49,851	53,679
Derivatives (trading and other liabilities), fair value		49,851	53,679
Fair Value, Inputs, Level 3
Financial assets
Investment securities available for sale		0	200
Investment securities available for sale, at fair value		0	200
Loans, net		19,865,011	19,776,381
Loans, net, fair value		19,752,810	19,680,317
Derivatives (trading and other assets)		1,803	3,114
Derivatives (trading and other assets), fair value		1,803	3,114
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts		20,213,126	20,282,321
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value		20,213,126	20,282,321
Derivatives (trading and other liabilities)		373	0
Derivatives (trading and other liabilities), fair value		$ 373	$ 0
[1]	(1)Effective January 1, 2017, residential loans originated for sale are accounted for under the fair value option. Prior periods have not been restated. For more information on this accounting policy change, please refer to Note 3 to the Notes to the Consolidated Financial Statements.

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals)	3 Months Ended
	Mar. 31, 2017
Fair Value of Assets and Liabilities [Line Items]
Closing ratio	90.00%
Weighted average discount rate	10.60%
Weighted average constant prepayment rate	10.90%
Maximum [Member]
Fair Value of Assets and Liabilities [Line Items]
Weighted average discount rate	20.00%
Minimum [Member]
Fair Value of Assets and Liabilities [Line Items]
Weighted average discount rate	20.00%

Retirement Plans, Components of

Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension Plan:
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,781	$ 1,725
Interest cost	1,756	1,780
Expected return on plan assets	(4,881)	(5,065)
Amortization of prior service cost	(19)	13
Amortization of actuarial loss	488	482
Total net pension cost	(875)	(1,065)
Postretirement Plan:
Net period benefit cost for the pension and postretirement plans
Interest cost	24	36
Amortization of prior service cost	(19)	0
Total net pension cost	$ 5	$ 36

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Income Statement Data Abstract
Net interest income	$ 180,274	$ 171,987
Noninterest income	79,831	83,192
Total revenue	260,105	255,179
Credit provision	9,000	20,000
Noninterest expense	173,691	173,971
Income (loss) before income taxes	77,414	61,208
Income tax expense (benefit)	21,144	18,674
Net income	$ 56,270	$ 42,534
Return on average allocated capital (ROCET1)	10.60%	8.60%
Segment Balance Sheet Data
Average earning assets	$ 26,339,314	$ 25,272,373
Average loans	20,072,725	18,922,830
Average deposits	21,465,722	20,575,174
Average allocated capital (CET1)	2,061,749	1,896,481
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	89,388	79,164
Noninterest income	11,993	11,613
Total revenue	101,381	90,777
Credit provision	11,580	12,739
Noninterest expense	37,479	34,403
Income (loss) before income taxes	52,322	43,635
Income tax expense (benefit)	17,649	14,579
Net income	$ 34,673	$ 29,056
Return on average allocated capital (ROCET1)	12.60%	11.30%
Segment Balance Sheet Data
Average earning assets	$ 10,759,811	$ 9,720,028
Average loans	10,753,314	9,711,221
Average deposits	6,420,401	5,918,341
Average allocated capital (CET1)	1,114,610	1,031,659
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	88,928	85,605
Noninterest income	64,870	63,748
Total revenue	153,798	149,353
Credit provision	4,507	6,142
Noninterest expense	116,097	121,295
Income (loss) before income taxes	33,194	21,916
Income tax expense (benefit)	11,618	7,670
Net income	$ 21,576	$ 14,246
Return on average allocated capital (ROCET1)	15.20%	9.10%
Segment Balance Sheet Data
Average earning assets	$ 9,130,457	$ 9,120,319
Average loans	9,128,656	9,119,020
Average deposits	11,337,064	11,100,195
Average allocated capital (CET1)	576,464	627,211
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	1,958	7,218
Noninterest income	2,968	7,831
Total revenue	4,926	15,049
Credit provision	(7,087)	1,119
Noninterest expense	20,115	18,273
Income (loss) before income taxes	(8,102)	(4,343)
Income tax expense (benefit)	(8,123)	(3,575)
Net income	$ 21	$ (768)
Return on average allocated capital (ROCET1)	(2.50%)	(5.00%)
Segment Balance Sheet Data
Average earning assets	$ 6,449,046	$ 6,432,026
Average loans	190,755	92,589
Average deposits	3,708,257	3,556,638
Average allocated capital (CET1)	$ 370,675	$ 237,611

Accumulated Other Comprehensi82

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (54,679)
Personnel expense	(104,419)	$ (101,398)
Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities)	(1,027)	(1,572)
Total other comprehensive income (loss)	(1,665)	34,783
Ending Balance	(56,344)
Investments Securities Available For Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(20,079)	459
Other comprehensive income (loss) before reclassifications	(2,112)	60,422
Investment securities gain, net		(3,098)
Personnel expense	0	0
Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities)	(1,027)	(1,572)
Income tax (expense) benefit	1,195	(21,275)
Total other comprehensive income (loss)	(1,944)	34,477
Ending Balance	(22,023)	34,936
Defined Benefit Pension and Post Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(34,600)	(33,075)
Other comprehensive income (loss) before reclassifications	0	0
Investment securities gain, net		0
Personnel expense	450	495
Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities)	0	0
Income tax (expense) benefit	(171)	(189)
Total other comprehensive income (loss)	279	306
Ending Balance	(34,321)	(32,769)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(54,679)	(32,616)
Other comprehensive income (loss) before reclassifications	(2,112)	60,422
Investment securities gain, net		(3,098)
Personnel expense	450	495
Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities)	(1,027)	(1,572)
Income tax (expense) benefit	1,024	(21,464)
Total other comprehensive income (loss)	(1,665)	34,783
Ending Balance	$ (56,344)	$ 2,167