10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2017

¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from             to

Commission file number: 001-31343

Associated Banc-Corp

(Exact name of registrant as specified in its charter)

Wisconsin	39-1098068
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
433 Main Street Green Bay, Wisconsin	54301
(Address of principal executive offices)	(Zip Code)

(920) 491-7500

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes  þ        No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  þ        No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  þ	Accelerated filer  ¨
Non-accelerated filer  ¨	Smaller reporting company ¨
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes  ¨        No  þ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

APPLICABLE ONLY TO CORPORATE ISSUERS:

The number of shares outstanding of registrant’s common stock, par value $0.01 per share, at April 26, 2017, was 152,319,854.

1

ASSOCIATED BANC-CORP

TABLE OF CONTENTS

		Page
PART I. Financial Information
	Item 1. Financial Statements (Unaudited):	3
	Consolidated Balance Sheets	3
	Consolidated Statements of Income	4
	Consolidated Statements of Comprehensive Income	5
	Consolidated Statements of Changes in Stockholders’ Equity	6
	Consolidated Statements of Cash Flows	7
	Notes to Consolidated Financial Statements	8
	Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	42
	Item 3. Quantitative and Qualitative Disclosures About Market Risk	67
	Item 4. Controls and Procedures	68
PART II. Other Information
	Item 1. Legal Proceedings	69
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	69
	Item 6. Exhibits	69
	Signatures	70

2

PART I - FINANCIAL INFORMATION
ITEM 1.	Financial Statements:

ASSOCIATED BANC-CORP

Consolidated Balance Sheets

	March 31, 2017			December 31, 2016
	(Unaudited)			(Audited)
	(In Thousands, except share and per share data)
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(1)	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, net	60,702			61,476
Other intangible assets	15,026			15,377
Trading assets	49,306			52,398
Other assets	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	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 equity:
Common stock	1,630			1,630
Surplus	1,469,744			1,459,498
Retained earnings	1,709,514			1,695,764
Accumulated other comprehensive income (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	165,000			165,000
Preferred shares authorized (par value $1.00 per share)	750,000			750,000
Common shares issued	163,030,209			163,030,209
Common shares authorized (par value $0.01 per share)	250,000,000			250,000,000
Treasury shares of common stock	9,296,566			10,909,362

(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.

See accompanying notes to consolidated financial statements.

3

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Income (Unaudited)

	Three months ended March 31,
	2017			2016
	(In Thousands, except per share data)
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	—			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, net	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	$	0.36		$	0.27
Diluted	$	0.35		$	0.27
Average common shares outstanding:
Basic	150,815			148,601
Diluted	153,869			149,454

See accompanying notes to consolidated financial statements.

4

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Comprehensive Income (Unaudited)

	Three Months Ended March 31,
	2017			2016
	($ in Thousands)
Net income	$	56,270		$	42,534
Other comprehensive income, net of tax:
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		)	—
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	—			(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 on pension and postretirement obligations	279			306
Total other comprehensive income (loss)	(1,665		)	34,783
Comprehensive income	$	54,605		$	77,317

See accompanying notes to consolidated financial statements.

5

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Changes in Stockholders’ Equity (Unaudited)

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

See accompanying notes to consolidated financial statements.

6

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Cash Flows (Unaudited)

	Three Months Ended March 31,
	2017			2016
	($ in Thousands)
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	—			(3,098		)
Asset (gains) losses, net	234			(524		)
(Gain) loss 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		)
Net change in other assets and other liabilities	(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	—			119,379
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks	59,090			—
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	—			615,000
Proceeds from issuance of common stock for stock-based compensation plans	17,940			2,205
Purchase of preferred stock	—			(1,092		)
Purchase of common stock returned to authorized but unissued	—			(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 (used) 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
Cash and cash equivalents at end of period	$	689,468		$	375,408
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			—
Acquisition:
Fair value of assets acquired, including cash and cash equivalents	—			522
Fair value ascribed to goodwill and intangible assets	217			4,119
Fair value of liabilities assumed	—			1,423

See accompanying notes to consolidated financial statements.

7

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Notes to Consolidated Financial Statements

These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with U.S. generally accepted accounting principles have been omitted or abbreviated. The information contained in the consolidated financial statements and footnotes in the Corporation's 2016 Annual Report on Form 10-K, should be referred to in connection with the reading of these unaudited interim financial statements.

Note 1Basis 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.

Note 2Acquisitions

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.

8

Note 3Summary 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.

9

Note 4Earnings 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.

Note 5Stock-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.

10

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.

11

Note 6Investment 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 Cost		Gross Unrealized Gains		Gross Unrealized Losses			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

12

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.

13

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 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	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.

14

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.

Note 7Loans

The period end loan composition was as follows.

	March 31, 2017		December 31, 2016
	($ 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

15

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.

16

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.

17

The following table presents impaired loans at March 31, 2017.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ 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.

18

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.

19

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.

20

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.

21

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

Note 8Goodwill 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.

22

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.

23

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

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Note 9Short 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

25

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.

Note 10Derivative 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.

26

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 Value			Balance Sheet Category
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 Value		Balance Sheet Category	Notional Amount	Fair Value		Balance Sheet Category
Interest rate lock commitments (mortgage)	291,674	1,803		Other assets	285,345	206		Other assets
Forward commitments (mortgage)	100,750	(373	)	Other liabilities	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			—

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Note 11Balance 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

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Note 12Commitments, 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.

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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,

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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.

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Note 13Fair 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.

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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.

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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.

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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

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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	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.

36

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

37

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.

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Note 14Retirement 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

Note 15Segment 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).

39

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		%

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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.

Note 16Accumulated 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

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ITEM 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

Special Note Regarding Forward-Looking Statements

This report contains statements that may constitute forward-looking statements within the meaning of the safe-harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995, such as statements other than historical facts contained or incorporated by reference into this report. These forward-looking statements include statements with respect to the Corporation’s financial condition, results of operations, plans, objectives, future performance and business, including statements preceded by, followed by or that include the words “believes,” “expects,” or “anticipates,” references to estimates or similar expressions. Future filings by the Corporation with the Securities and Exchange Commission, and future statements other than historical facts contained in written material, press releases and oral statements issued by, or on behalf of the Corporation may also constitute forward-looking statements.

All forward-looking statements contained in this report or which may be contained in future statements made for or on behalf of the Corporation are based upon information available at the time the statement is made and the Corporation assumes no obligation to update any forward-looking statements, except as required by federal securities law. Forward-looking statements are subject to significant risks and uncertainties, and the Corporation’s actual results may differ materially from the expected results discussed in such forward-looking statements. Factors that might cause actual results to differ from the results discussed in forward-looking statements include, but are not limited to, the risk factors in Item 1A, Risk Factors, in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2016, and as may be described from time to time in the Corporation’s subsequent SEC filings.

Overview

The following discussion and analysis is presented to assist in the understanding and evaluation of the Corporation’s financial condition and results of operations. It is intended to complement the unaudited consolidated financial statements, footnotes, and supplemental financial data appearing elsewhere in this Form 10-Q and should be read in conjunction therewith. Management continually evaluates strategic acquisition opportunities and other various strategic alternatives that could involve the sale or acquisition of branches or other assets, or the consolidation or creation of subsidiaries.

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Performance Summary

• Average loans of $20.1 billionincreased$1.1 billion, or 6%, from the first quarter of the prior year, and commercial lending accounted for 53% of average loan growth. Average deposits of $21.5 billionincreased$891 million, or 4%, from the first quarter of the prior year. For the remainder of 2017, the Corporation expects mid-to-high single digit annual average loan growth and to maintain the loan to deposit ratio under 100%.

• Net interest income of $180 millionincreased$8 million, or 5%, from the first quarter of the prior year. Net interest margin was 2.84% compared to 2.81% in the first quarter of the prior year. For the remainder of 2017, the Corporation expects an improving net interest margin trend.

• Provision for credit losses of $9 milliondecreased$11 million, or 55%, from the first quarter of the prior year. For the remainder of 2017, the Corporation expects the provision for loan losses will change based on changes in risk grade or other indicators of credit quality, and loan volume.

• Noninterest income of $80 million was down 4% from the first quarter of 2016 and reflected less investment securities gains . For the remainder of 2017, the Corporation expects improving fee-based revenues, increasing tax credit investment activity, and declining mortgage banking revenue.

• Noninterest expense of $174 million was essentially flat from the first quarter of the prior year. For the remainder of 2017, the Corporation expects noninterest expense to be approximately 1% higher than the prior year; however, the Corporation also expects continued improvement in the efficiency ratio due to increasing revenue.

Table 1 Summary Results of Operations: Trends

($ in thousands, except per share data)	1Q17			4Q16			3Q16			2Q16			1Q16
Net income	$	56,270		$	54,833		$	53,816		$	49,091		$	42,534
Net income available to common equity	53,940			52,485			51,628			46,922			40,336
Earnings per common share - basic	0.36			0.35			0.34			0.31			0.27
Earnings per common share - diluted	0.35			0.34			0.34			0.31			0.27
Effective tax rate	27.31		%	30.07		%	30.52		%	30.39		%	30.51		%

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Income Statement Analysis

Net Interest Income

Table 2 Net Interest Income Analysis

	Quarter ended
	March 31, 2017						December 31, 2016						March 31, 2016
	Average Balance		Interest Income / Expense		Average Yield / Rate		Average Balance		Interest Income / Expense		Average Yield / Rate		Average Balance		Interest Income / Expense		Average Yield / Rate
	($ in Thousands)
ASSETS
Earning assets:
Loans:(1)(2)(3)
Commercial and business lending	$	7,199,481	$	60,680	3.42	%	$	7,406,810	$	61,501	3.30	%	$	7,121,061	$	57,291	3.23	%
Commercial real estate lending	4,999,994		45,135		3.66	%	4,914,643		42,663		3.45	%	4,469,531		38,989		3.51	%
Total commercial	12,199,475		105,815		3.52	%	12,321,453		104,164		3.36	%	11,590,592		96,280		3.34	%
Residential mortgage	6,564,600		53,306		3.25	%	6,317,769		49,557		3.14	%	5,920,280		47,748		3.23	%
Retail	1,308,650		15,450		4.74	%	1,337,848		16,679		4.98	%	1,411,958		16,607		4.71	%
Total loans	20,072,725		174,571		3.51	%	19,977,070		170,400		3.40	%	18,922,830		160,635		3.41	%
Investment securities:
Taxable	4,830,421		23,475		1.94	%	4,963,633		22,418		1.81	%	5,034,072		25,516		2.03	%
Tax-exempt(1)	1,138,010		12,438		4.37	%	1,140,175		12,523		4.39	%	1,045,210		11,980		4.58	%
Other short-term investments	298,158		1,536		2.08	%	342,344		1,380		1.61	%	270,261		1,067		1.59	%
Investments and other	6,266,589		37,449		2.39	%	6,446,152		36,321		2.25	%	6,349,543		38,563		2.43	%
Total earning assets	26,339,314		$	212,020	3.24	%	26,423,222		$	206,721	3.12	%	25,272,373		$	199,198	3.16	%
Other assets, net	2,441,013						2,482,062						2,426,475
Total assets	$	28,780,327					$	28,905,284					$	27,698,848
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Interest-bearing deposits:
Savings	$	1,465,811	$	188	0.05	%	$	1,451,803	$	198	0.05	%	$	1,367,646	$	236	0.07	%
Interest-bearing demand	4,251,357		4,210		0.40	%	4,140,072		3,248		0.31	%	3,220,409		2,032		0.25	%
Money market	9,169,141		9,388		0.42	%	9,296,364		7,269		0.31	%	9,432,245		6,444		0.27	%
Time	1,613,331		3,138		0.79	%	1,560,145		3,058		0.78	%	1,558,278		3,054		0.79	%
Total interest-bearing deposits	16,499,640		16,924		0.42	%	16,448,384		13,773		0.33	%	15,578,578		11,766		0.30	%
Federal funds purchased and securities sold under agreements to repurchase	495,311		515		0.42	%	549,738		314		0.23	%	559,459		296		0.21	%
Other short-term funding	683,306		1,080		0.64	%	491,800		458		0.37	%	777,898		515		0.27	%
Total short-term funding	1,178,617		1,595		0.55	%	1,041,538		772		0.29	%	1,337,357		811		0.24	%
Long-term funding	2,761,850		7,996		1.17	%	2,761,695		6,875		0.99	%	2,582,538		9,505		1.47	%
Total short and long-term funding	3,940,467		9,591		0.98	%	3,803,233		7,647		0.80	%	3,919,895		10,316		1.05	%
Total interest-bearing liabilities	20,440,107		$	26,515	0.52	%	20,251,617		$	21,420	0.42	%	19,498,473		$	22,082	0.45	%
Noninterest-bearing demand deposits	4,966,082						5,294,078						4,996,596
Other liabilities	250,747						274,829						233,029
Stockholders’ equity	3,123,391						3,084,760						2,970,750
Total liabilities and stockholders’ equity	$	28,780,327					$	28,905,284					$	27,698,848
Interest rate spread					2.72	%					2.70	%					2.71	%
Net free funds					0.12	%					0.10	%					0.10	%
Fully tax-equivalent net interest income and net interest margin			$	185,505	2.84	%			$	185,301	2.80	%			$	177,116	2.81	%
Fully tax-equivalent adjustment			5,231						5,266						5,129
Net interest income			$	180,274					$	180,035					$	171,987

(1) The yield on tax-exempt loans and securities is computed on a fully tax-equivalent basis using a tax rate of 35% for all periods presented and is net of the effects of certain disallowed interest deductions.

(2) Nonaccrual loans and loans held for sale have been included in the average balances.

(3) Interest income includes net loan fees.

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Notable Contributions to the Change in Net Interest Income

• Net interest income in the consolidated statements of income (which excludes the fully tax-equivalent adjustment) was $180 million for the first quarter of 2017 compared to $172 million for first quarter of 2016. See sections “Interest Rate Risk” and “Quantitative and Qualitative Disclosures about Market Risk,” for a discussion of interest rate risk and market risk.

• Fully tax-equivalent net interest income of $186 million for the first quarter of 2017 was $8 million higher than the first quarter of 2016.

• Average earning assets of $26.3 billion for the first quarter of 2017 were $1.1 billion, or 4%, higher than the first quarter of 2016. Average loans increased $1.1 billion, or 6%, primarily due to a $644 million increase in residential mortgage loans and a $530 million increase in commercial real estate lending. Average securities and short-term investments declined $83 million, or 1% from the first quarter of 2016.

• Average interest-bearing liabilities of $20.4 billion for the first quarter of 2017 were up $942 million, or 5%, versus the first quarter of 2016. On average, interest-bearing deposits increased $921 million and noninterest-bearing demand deposits (a principal component of net free funds) decreased by $31 million. On average, short and long-term funding increased $21 million from first quarter of 2016, including a $179 million increase in long-term funding, partially offset by a $159 million decrease in short-term funding.

• The net interest margin for the first quarter of 2017 was 2.84%, compared to 2.81% for the first quarter of 2016. The 3 basis points ("bp") increase in net interest margin was attributable to a 1 bp increase in interest rate spread (the net of a 8 bp increase in the yield on earning assets and a 7 bp increase in the cost of interest-bearing liabilities), and a 2 bp increase in net free funds.

• For the first quarter of 2017, loan yields increased 10 bp to 3.51% from the first quarter of 2016. The yield on investment securities and other short-term investments decreased 4 bp to 2.39%, and was impacted by the reinvestment of cash flows in a low interest rate environment.

• The cost of interest-bearing liabilities was 0.52% for the first quarter of 2017, 7 bp higher than the first quarter of 2016. The increase was due to a 12 bp increase in the cost of average interest-bearing deposits (to 0.42%) and a 31 bp increase in the cost of short-term funding (to 0.55%), both primarily due to the December 2016 Federal Reserve interest rate increase; partially offset by a 30 bp decrease in the cost of long-term funding (to 1.17%), primarily due to the early redemption of $430 million of senior notes in February 2016.

• The Federal Reserve increased the targeted federal funds rate on March 15, 2017, to a range of 0.75%-1.00% from 0.50%-0.75%. The Federal Reserve expects gradual increases in the federal funds rate, however, the timing and magnitude of any such increases are uncertain and will depend on domestic and global economic conditions.

Provision for Credit Losses

The provision for credit losses (which includes the provision for loan losses and the provision for unfunded commitments) for the three months ended March 31, 2017 was $9 million, compared to $20 million for the three months endedMarch 31, 2016. Net charge offs were $6 million (representing 0.11% of average loans) for the three months ended March 31, 2017, compared to $17 million (representing 0.36% of average loans) for the three months endedMarch 31, 2016. The ratio of the allowance for loan losses to total loans was 1.40% and 1.44% at March 31, 2017 and 2016, respectively.

The provision for credit losses is predominantly a function of the Corporation’s reserving methodology and judgments as to other qualitative and quantitative factors used to determine the appropriate level of the allowance for loan losses and the allowance for unfunded commitments, which focuses on changes in the size and character of the loan portfolio, changes in levels of impaired and other nonaccrual loans, historical losses and delinquencies in each portfolio category, the level of loans sold or transferred to held for sale, the risk inherent in specific loans, concentrations of loans to specific borrowers or industries, existing economic conditions, the fair value of underlying collateral, and other factors which could affect potential credit losses. See additional discussion under sections, “Loans,” “Credit Risk,” “Nonperforming Assets,” and “Allowance for Credit Losses."

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Noninterest Income

Table 3 Noninterest Income

																1Q17 Change vs
($ in Thousands)	1Q17			4Q16			3Q16			2Q16			1Q16			4Q16		1Q16
Trust service fees	$	11,935		$	12,211		$	11,700		$	11,509		$	11,447		(2	)%	4	%
Service charges on deposit accounts	16,356			16,447			17,445			16,444			16,273			(1	)%	1	%
Card-based and other nondeposit fees	12,465			12,592			12,777			12,717			11,991			(1	)%	4	%
Insurance commissions	21,620			17,977			19,431			22,005			21,382			20	%	1	%
Brokerage and annuity commissions	4,333			4,188			4,155			4,098			3,794			3	%	14	%
Subtotal ("fee-based revenue")	66,709			63,415			65,508			66,773			64,887			5	%	3	%
Mortgage banking income	7,273			12,058			21,903			8,300			7,987			(40	)%	(9	)%
Mortgage servicing rights expense	2,694			499			3,612			4,233			3,783			N/M		(29	)%
Mortgage banking, net	4,579			11,559			18,291			4,067			4,204			(60	)%	9	%
Capital market fees, net	3,883			7,716			7,012			3,793			3,538			(50	)%	10	%
Bank owned life insurance income	2,615			3,338			3,290			2,973			4,770			(22	)%	(45	)%
Other	2,279			2,379			2,180			1,789			2,171			(4	)%	5	%
Subtotal (“fee income”)	80,065			88,407			96,281			79,395			79,570			(9	)%	1	%
Asset gains (losses), net	(234		)	767			(1,034		)	(343		)	524			(131	)%	(145	)%
Investment securities gains (losses), net	—			3,115			(13		)	3,116			3,098			(100	)%	(100	)%
Total noninterest income	$	79,831		$	92,289		$	95,234		$	82,168		$	83,192		(13	)%	(4	)%
Mortgage loans originated for sale during period	$	101,280		$	287,194		$	466,092		$	323,989		$	193,849		(65	)%	(48	)%
Mortgage loan settlements during period	$	196,578		$	395,382		$	655,298		$	270,216		$	221,764		(50	)%	(11	)%
Trust assets under management, at market value	$	8,715,965		$	8,301,564		$	8,178,839		$	7,944,187		$	7,843,512		5	%	11	%
Fee income ratio*	31		%	32		%	35		%	31		%	31		%
N/M = Not meaningful
* Fee income ratio is fee income, per the above table, divided by total revenue (defined as net interest income plus noninterest income).

Notable Contributions to the Change in Noninterest Income

• Fee-based revenue was $67 million, an increase of $2 million (3%) compared to the first quarter of 2016. All fee based revenue items increased slightly with the most notable in brokerage and annuity commissions which increased 14% from first quarter of 2016 due to a stronger market backdrop.

• Net mortgage banking income was $5 million, a slight increase from the first quarter of 2016. Gross mortgage banking income decreased for the first quarter of 2017 compared to the first quarter of 2016, primarily due to a $1 million reduction in the fair value of mortgage derivatives.

• Bank owned life insurance income ("BOLI") was $3 million, a decrease of $2 million (45%) compared to the first quarter of 2016, primarily due to proceeds from BOLI policy claims during the first quarter of 2016.

• Net investment securities gains were down $3 million for the first quarter of 2017, due to the sale of FNMA and FHLMC securities and reinvestment into GNMA mortgage-related securities in the first quarter of 2016.

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Noninterest Expense

Table 4 Noninterest Expense

																1Q17 Change vs
($ in Thousands)	1Q17			4Q16			3Q16			2Q16			1Q16			4Q16		1Q16
Personnel expense	$	104,419		$	107,491		$	103,819		$	102,129		$	101,398		(3	)%	3	%
Occupancy	15,219			13,690			15,362			13,215			13,802			11	%	10	%
Equipment	5,485			5,328			5,319			5,396			5,446			3	%	1	%
Technology	14,420			14,413			14,173			14,450			14,264			—	%	1	%
Business development and advertising	5,835			6,298			5,251			6,591			8,211			(7	)%	(29	)%
Other intangible amortization	513			525			525			539			504			(2	)%	2	%
Loan expense	2,620			3,443			3,535			3,442			3,221			(24	)%	(19	)%
Legal and professional fees	4,166			5,184			4,804			4,856			5,025			(20	)%	(17	)%
Foreclosure / OREO expense	1,505			677			960			1,330			1,877			122	%	(20	)%
FDIC expense	8,000			9,250			9,000			8,750			7,750			(14	)%	3	%
Other	11,509			12,616			12,566			13,662			12,473			(9	)%	(8	)%
Total noninterest expense	$	173,691		$	178,915		$	175,314		$	174,360		$	173,971		(3	)%	—	%
Personnel expense to total noninterest expense	60		%	60		%	59		%	59		%	58		%
Average full-time equivalent employees	4,370			4,439			4,477			4,415			4,374

Notable Contributions to the Change in Noninterest Expense

• Personnel expense (which includes salary-related expenses and fringe benefit expenses) was $104 million for the first quarter of 2017, up $3 million (3%) from the first quarter of 2016. The increase was primarily due to a $1 million increase in social security tax resulting from increased activity in stock options exercised, along with a less than $1 million increase in health insurance costs.

• Nonpersonnel noninterest expense on a combined basis were $69 million, down $3 million (5%) compared to the first quarter of 2016. Occupancy expense was up $1 million (10%) from the first quarter of 2016, primarily due to higher lease terminations and adjustments incurred in the first quarter of 2017. Business development and advertising was down $2 million from the first quarter of 2016 due to a shift in our advertising strategy from television to digital advertising.

Income Taxes

The Corporation recognized income tax expense of $21 million for the three months ended March 31, 2017 compared to income tax expense of $19 million for three months ended March 31, 2016. The increase in income tax expense was due primarily to the increase in pretax income between the periods, partially offset by a $3 million tax benefit on stock-based compensation booked during the first quarter of 2017 under the new accounting standard adopted by the Corporation in the fourth quarter of 2016. The effective tax rate was 27.31% for the first three months of 2017, compared to an effective tax rate of 30.51% for the first three months of 2016.

Income tax expense recorded in the consolidated statements of income involves the interpretation and application of certain accounting pronouncements and federal and state tax laws and regulations, and is, therefore, considered a critical accounting policy. The Corporation is subject to examination by various taxing authorities. Examination by taxing authorities may impact the amount of tax expense and / or reserve for uncertainty in income taxes if their interpretations differ from those of management, based on their judgments about information available to them at the time of their examinations. See section “Critical Accounting Policies," in the Corporation’s 2016 Annual Report on Form 10-K for additional information on income taxes.

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Balance Sheet Analysis

• At March 31, 2017, total assets were $29.1 billion, minimally changed from December 31, 2016 and up $931 million (3%) from March 31, 2016.

• Loans of $20.1 billion at March 31, 2017 were minimally changed from December 31, 2016 and were up $920 million (5%) from March 31, 2016. See section "Loans" for additional information on loans.

• Investment securities were $5.9 billion at March 31, 2017, down slightly (2%) from year-end 2016 and down $227 million (4%) from March 31, 2016.

• At March 31, 2017, total deposits of $21.8 billion were relatively unchanged from December 31, 2016 and were up $1.1 billion (6%) from March 31, 2016. See section "Deposits and Customer Funding" for additional information on deposits.

• Short and long-term funding of $3.8 billion at March 31, 2017 were relatively unchanged from year-end 2016 and down $436 million (10%) from March 31, 2016.

Loans

Table 5 Period End Loan Composition

	March 31, 2017				December 31, 2016				September 30, 2016				June 30, 2016				March 31, 2016
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
	($ in Thousands)
Commercial and industrial	$	6,300,646	31	%	$	6,489,014	32	%	$	6,721,557	34	%	$	6,701,986	34	%	$	6,511,648	34	%
Commercial real estate — owner occupied	878,391		4	%	897,724		5	%	892,678		4	%	921,736		5	%	917,285		5	%
Commercial and business lending	7,179,037		35	%	7,386,738		37	%	7,614,235		38	%	7,623,722		39	%	7,428,933		39	%
Commercial real estate — investor	3,415,355		17	%	3,574,732		18	%	3,530,370		18	%	3,495,791		18	%	3,276,733		17	%
Real estate construction	1,553,205		8	%	1,432,497		7	%	1,314,431		7	%	1,285,573		6	%	1,184,398		6	%
Commercial real estate lending	4,968,560		25	%	5,007,229		25	%	4,844,801		25	%	4,781,364		24	%	4,461,131		23	%
Total commercial	12,147,597		60	%	12,393,967		62	%	12,459,036		63	%	12,405,086		63	%	11,890,064		62	%
Residential mortgage	6,715,282		33	%	6,332,327		31	%	6,034,166		30	%	6,035,720		30	%	5,944,457		31	%
Home equity revolving lines of credit	823,594		4	%	840,872		4	%	851,382		4	%	861,311		4	%	867,860		4	%
Home equity loans junior liens	88,375		1	%	93,571		1	%	100,212		1	%	107,460		1	%	115,134		1	%
Home equity	911,969		5	%	934,443		5	%	951,594		5	%	968,771		5	%	982,994		5	%
Other consumer	372,835		2	%	393,979		2	%	399,209		2	%	405,709		2	%	409,725		2	%
Total consumer	8,000,086		40	%	7,660,749		38	%	7,384,969		37	%	7,410,200		37	%	7,337,176		38	%
Total loans	$	20,147,683	100	%	$	20,054,716	100	%	$	19,844,005	100	%	$	19,815,286	100	%	$	19,227,240	100	%
Commercial real estate - investor and Real estate construction loan detail:
Farmland	$	1,487	—	%	$	1,613	—	%	$	6,530	—	%	$	6,181	—	%	$	5,557	—	%
Multi-family	967,474		28	%	1,027,541		29	%	1,030,976		29	%	1,076,549		31	%	974,051		30	%
Non-owner occupied	2,446,394		72	%	2,545,578		71	%	2,492,864		71	%	2,413,061		69	%	2,297,125		70	%
Commercial real estate — investor	$	3,415,355	100	%	$	3,574,732	100	%	$	3,530,370	100	%	$	3,495,791	100	%	$	3,276,733	100	%
1-4 family construction	$	389,902	25	%	$	358,398	25	%	$	330,250	25	%	$	353,244	27	%	$	320,984	27	%
All other construction	1,163,303		75	%	1,074,099		75	%	984,181		75	%	932,329		73	%	863,414		73	%
Real estate construction	$	1,553,205	100	%	$	1,432,497	100	%	$	1,314,431	100	%	$	1,285,573	100	%	$	1,184,398	100	%

• Commercial and business lending was $7.2 billion and represented 35% of total loans at March 31, 2017, a decrease of $208 million (3%) from December 31, 2016 and a decrease of $250 million (3%) from March 31, 2016.

• Commercial real estate lending totaled $5.0 billion at March 31, 2017 and represented 25% of total loans, a decrease of $39 million (1%) from December 31, 2016 and an increase of $507 million (11%) from March 31, 2016.

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• Consumer loans were $8.0 billion and represented 40% of total loans at March 31, 2017, an increase of $339 million (4%) from December 31, 2016 and an increase of $663 million (9%) from March 31, 2016.

The Corporation has long-term guidelines relative to the proportion of Commercial and Business, Commercial Real Estate, and Consumer loans within the overall loan portfolio, with each targeted to represent 30-40% of the overall loan portfolio. The targeted long-term guidelines were unchanged during 2016 and the first three months of 2017. Furthermore, certain sub-asset classes within the respective portfolios were further defined and dollar limitations were placed on these sub-portfolios. These guidelines and limits are reviewed quarterly and approved annually by the Enterprise Risk Committee of the Corporation’s Board of Directors. These guidelines and limits are designed to create balance and diversification within the loan portfolios.

Credit Risk

An active credit risk management process is used for commercial loans to ensure that sound and consistent credit decisions are made. Credit risk is controlled by detailed underwriting procedures, comprehensive loan administration, and periodic review of borrowers’ outstanding loans and commitments. Borrower relationships are formally reviewed and graded on an ongoing basis for early identification of potential problems. Further analysis by customer, industry, and geographic location are performed to monitor trends, financial performance, and concentrations. See Note 7 Loans, for additional information on managing overall credit quality.

The loan portfolio is widely diversified by types of borrowers, industry groups, and market areas within our branch footprint. Significant loan concentrations are considered to exist when there are amounts loaned to numerous borrowers engaged in similar activities that would cause them to be similarly impacted by economic or other conditions. At March 31, 2017, no significant concentrations existed in the Corporation’s portfolio in excess of 10% of total loans.

Commercial and business lending: The commercial and business lending classification primarily includes commercial loans to large corporations, middle market companies and small businesses and lease financing. At March 31, 2017, the largest industry group within the commercial and business lending category was the manufacturing sector which represented 6% of total loans and 18% of the total commercial and business lending portfolio. The next largest industry groups within the commercial and business lending category included the power and utilities portfolio, which represented 5% of total loans and represented 14% of the total commercial and business lending portfolio at March 31, 2017. The remaining commercial and business lending portfolio is spread over a diverse range of industries, none of which exceed 5% of total loans. The credit risk related to commercial loans is largely influenced by general economic conditions and the resulting impact on a borrower’s operations or on the value of underlying collateral, if any. Currently, a higher risk segment of the commercial and business lending portfolio is loans to borrowers supporting oil and gas exploration and production, which are further discussed under “Oil and gas lending” below.

Oil and gas lending: The Corporation provides reserve based loans to oil and gas exploration and production firms. The Corporation's oil and gas lending team is based in Houston and focuses on serving the funding needs of small and mid-sized companies in the upstream oil and gas business. The oil and gas loans are generally first lien, reserve-based, and borrowing base dependent lines of credit. A small portion of the portfolio is in a second lien position to which the Corporation also holds the first lien position. The portfolio is diversified across all major U.S. geographic basins. The portfolio is diverse by product line with approximately 50% in oil and 50% in gas at March 31, 2017. Borrowing base re-determinations for the portfolio are completed at least twice a year and are based on detailed engineering reports and discounted cash flow analysis.

The following table summarizes information about the Corporation's oil and gas loan portfolio.

Table 6 Oil and Gas Loan Portfolio

	March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016			March 31, 2016
	($ in Millions)
Pass	$	405		$	426		$	351		$	387		$	402
Special mention	8			20			47			64			75
Potential problem	78			75			171			176			150
Nonaccrual	134			147			127			129			129
Total Oil and gas related loans	$	625		$	668		$	696		$	756		$	756
Quarter net charge offs	$	6		$	6		$	22		$	19		$	13
Oil and gas related allowance	$	42		$	38		$	38		$	42		$	49
Oil and gas related allowance ratio	6.7		%	5.7		%	5.5		%	5.6		%	6.5		%

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The Corporation proactively risk grades and reserves accordingly against the oil and gas loan portfolio. Lower market pricing and increased market volatility has led to downward migration within the portfolio. At March 31, 2017, nonaccrual oil and gas related loans totaled approximately $134 million, representing 21% of the oil and gas loan portfolio, a decrease of $13 million from December 31, 2016.

Commercial real estate - investor: Commercial real estate-investor is comprised of loans secured by various non-owner occupied or investor income producing property types. At March 31, 2017, the largest property type exposures within the commercial real estate-investor portfolio were loans secured by retail properties which represented 5% of total loans and 29% of the total commercial real estate-investor portfolio and loans secured by multi-family properties which represented 5% of total loans and 28% of the total commercial real estate-investor portfolio. The remaining commercial real estate-investor portfolio is spread over various other property types, none of which exceed 5% of total loans. Credit risk is managed in a similar manner to commercial and business lending by employing sound underwriting guidelines, lending primarily to borrowers in local markets and businesses, periodically evaluating the underlying collateral, and formally reviewing the borrower’s financial soundness and relationship on an ongoing basis.

Real estate construction: Real estate construction loans are primarily short-term or interim loans that provide financing for the acquisition or development of commercial income properties, multi-family projects or residential development, both single family and condominium. Real estate construction loans are made to developers and project managers who are generally well known to the Corporation and have prior successful project experience. The credit risk associated with real estate construction loans is generally confined to specific geographic areas but is also influenced by general economic conditions. The Corporation controls the credit risk on these types of loans by making loans in familiar markets to developers, reviewing the merits of individual projects, controlling loan structure, and monitoring project progress and construction advances.

The Corporation’s current lending standards for commercial real estate and real estate construction lending are determined by property type and specifically address many criteria, including: maximum loan amounts, maximum loan-to-value (“LTV”), requirements for pre-leasing and / or presales, minimum borrower equity, and maximum loan to cost. Currently, the maximum standard for LTV is 80%, with lower limits established for certain higher risk types, such as raw land which has a 50% LTV maximum. The Corporation’s LTV guidelines are in compliance with regulatory supervisory limits. In most cases, for real estate construction loans, the loan amounts include interest reserves, which are built into the loans and sized to fund loan payments through construction and lease up and / or sell out.

Table 7 Commercial Loan Distribution and Interest Rate Sensitivity

March 31, 2017	Within 1 Year (a)			1-5 Years			After 5 Years			Total			% of Total
	($ in Thousands)
Commercial and industrial	$	5,456,570		$	596,005		$	248,071		$	6,300,646		52	%
Commercial real estate — investor	2,286,974			1,055,155			73,226			3,415,355			28	%
Commercial real estate — owner occupied	408,034			346,811			123,546			878,391			7	%
Real estate construction	1,371,372			175,279			6,554			1,553,205			13	%
Total	$	9,522,950		$	2,173,250		$	451,397		$	12,147,597		100	%
Fixed rate	$	4,293,252		$	817,117		$	296,386		$	5,406,755		45	%
Floating or adjustable rate	5,229,698			1,356,133			155,011			6,740,842			55	%
Total	$	9,522,950		$	2,173,250		$	451,397		$	12,147,597		100	%
Percent by maturity distribution	78		%	18		%	4		%	100		%

(a) Demand loans, past due loans, and overdrafts are reported in the “Within 1 Year” category.

The total commercial loans that were floating or adjustable rate was $6.7 billion (55%) at March 31, 2017. Including the $4.3 billion of fixed rate loans due within one year, 91% of the commercial loan portfolio noted above matures, re-prices, or resets within one year.

Residential mortgages: Residential mortgage loans are primarily first lien home mortgages with a maximum loan to collateral value without credit enhancement (e.g. private mortgage insurance) of 80%. At March 31, 2017, the residential mortgage portfolio was comprised of $2.0 billion of fixed-rate residential real estate mortgages and $4.7 billion of variable-rate residential real estate mortgages, compared to $1.8 billion of fixed-rate mortgages and $4.5 billion variable-rate mortgages at December 31, 2016. The residential mortgage portfolio is focused primarily in our three-state branch footprint, with approximately 88% of the outstanding loan balances in our branch footprint at March 31, 2017. As part of management’s historical practice of originating and servicing residential mortgage loans, generally the Corporation’s 30-year, agency conforming, fixed-rate residential real estate mortgage loans are sold in the secondary market with servicing rights retained. The majority of the on balance sheet residential mortgage portfolio consists of hybrid, adjustable rate mortgage loans with initial fixed rate terms of 3, 5, 7, or 10 years. The Corporation also generally retains certain fixed-rate residential real estate mortgages in its loan portfolio, including retail and private banking

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jumbo mortgages and CRA-related mortgages. As part of management’s historical practice of originating and servicing residential mortgage loans, generally the Corporation’s 30-year, agency conforming, fixed-rate residential real estate mortgage loans were sold in the secondary market with servicing rights retained. Beginning in the fourth quarter of 2016, the Corporation began to hold some of these 30-year mortgage loans to take advantage of rising rates.

The Corporation’s underwriting and risk-based pricing guidelines for residential mortgage loans include minimum borrower FICO and maximum LTV of the property securing the loan. Residential mortgage products generally are underwritten using FHLMC and FNMA secondary marketing guidelines.

Home equity: Home equity consists of both home equity lines of credit and closed-end home equity loans, approximately 24% are first lien positions. Home equity loans and lines in a junior position at March 31, 2017 included approximately 40% for which the Corporation also owned or serviced the related first lien loan and approximately 60% where the Corporation did not service the related first lien loan.

The Corporation’s credit risk monitoring guidelines for home equity is based on an ongoing review of loan delinquency status, as well as a quarterly review of FICO score deterioration and property devaluation. The Corporation does not routinely obtain appraisals on performing loans to update LTV ratios after origination; however, the Corporation monitors the local housing markets by reviewing the various home price indices and incorporates the impact of the changing market conditions in its ongoing credit monitoring process. For junior lien home equity loans, the Corporation is unable to track the performance of the first lien loan if it does not own or service the first lien loan. However, the Corporation obtains a refreshed FICO score on a quarterly basis and monitors this as part of its assessment of the home equity portfolio.

The Corporation’s underwriting and risk-based pricing guidelines for home equity lines and loans consist of a combination of both borrower FICO and the original cumulative LTV against the property securing the loan.  Currently, our policy sets the maximum acceptable LTV at 90% and the minimum acceptable FICO at 670.  The Corporation's current home equity line of credit offering is priced based on floating rate indices and generally allows 10 years of interest-only payments followed by a 20-year amortization of the outstanding balance.  The Corporation has significantly curtailed its offerings of fixed-rate, closed end home equity loans.  The loans in the Corporation's portfolio generally have an original term of 20 years with principal and interest payments required.

Based upon outstanding balances at March 31, 2017, the following table presents the periods when home equity lines of credit revolving periods are scheduled to end.

Table 8 Home Equity Line of Credit - Revolving Period End Dates

	$ in Thousands		% to Total
Less than 5 years	$	50,345	6	%
5 — 10 years	218,697		27	%
Over 10 years	554,552		67	%
Total home equity revolving lines of credit	$	823,594	100	%

Other consumer: Other consumer consists of student loans, as well as short-term and other personal installment loans and credit cards. The Corporation had $206 million and $214 million of student loans at March 31, 2017, and December 31, 2016, respectively, the majority of which are government guaranteed. Credit risk for non-government guaranteed student, short-term and personal installment loans and credit cards is influenced by general economic conditions, the characteristics of individual borrowers, and the nature of the loan collateral. Risks of loss are generally on smaller average balances per loan spread over many borrowers. Once charged off, there is usually less opportunity for recovery of these smaller consumer loans. Credit risk is primarily controlled by reviewing the creditworthiness of the borrowers, monitoring payment histories, and taking appropriate collateral and guarantee positions. The student loan portfolio is in run-off and no new student loans are being originated.

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Nonperforming Assets

Management is committed to a proactive nonaccrual and problem loan identification philosophy. This philosophy is implemented through the ongoing monitoring and review of all pools of risk in the loan portfolio to ensure that problem loans are identified quickly and the risk of loss is minimized. Table 9 provides detailed information regarding nonperforming assets, which include nonaccrual loans and other real estate owned.

Table 9 Nonperforming Assets

	March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016			March 31, 2016
	($ in Thousands)
Nonperforming assets:
Commercial and industrial	$	164,891		$	183,371		$	205,902		$	193,439		$	197,115
Commercial real estate — owner occupied	17,925			9,544			6,995			9,635			9,443
Commercial and business lending	182,816			192,915			212,897			203,074			206,558
Commercial real estate — investor	8,273			18,051			8,028			11,528			12,330
Real estate construction	1,247			844			864			957			840
Commercial real estate lending	9,520			18,895			8,892			12,485			13,170
Total commercial	192,336			211,810			221,789			215,559			219,728
Residential mortgage	54,183			50,236			53,475			52,300			52,212
Home equity revolving lines of credit	8,817			8,588			9,462			8,797			8,822
Home equity loans junior liens	4,395			4,413			4,885			5,566			5,250
Home equity	13,212			13,001			14,347			14,363			14,072
Other consumer	260			256			300			380			383
Total consumer	67,655			63,493			68,122			67,043			66,667
Total nonaccrual loans	259,991			275,303			289,911			282,602			286,395
Commercial real estate owned	5,599			7,176			9,758			7,473			9,695
Residential real estate owned	1,941			3,098			3,006			4,391			4,689
Bank properties real estate owned	—			—			1,735			1,805			1,672
Other real estate owned (“OREO”)	7,540			10,274			14,499			13,669			16,056
Other nonperforming assets	7,418			7,418			—			—			—
Total nonperforming assets (“NPAs”)	$	274,949		$	292,995		$	304,410		$	296,271		$	302,451
Accruing loans past due 90 days or more:
Commercial	$	258		$	236		$	254		$	248		$	217
Consumer	1,462			1,377			1,257			1,246			1,412
Total accruing loans past due 90 days or more	$	1,720		$	1,613		$	1,511		$	1,494		$	1,629
Restructured loans (accruing):
Commercial	$	51,274		$	53,022		$	53,410		$	57,251		$	57,980
Consumer	27,785			26,835			26,660			26,175			27,617
Total restructured loans (accruing)	$	79,059		$	79,857		$	80,070		$	83,426		$	85,597
Nonaccrual restructured loans (included in nonaccrual loans)	$	78,902		$	29,385		$	31,758		$	34,841		$	35,232
Ratios:
Nonaccrual loans to total loans	1.29		%	1.37		%	1.46		%	1.43		%	1.49		%
NPAs to total loans plus OREO	1.36		%	1.46		%	1.53		%	1.49		%	1.57		%
NPAs to total assets	0.94		%	1.01		%	1.04		%	1.02		%	1.07		%
Allowance for loan losses to nonaccrual loans	109		%	101		%	93		%	95		%	97		%

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Table 9 Nonperforming Assets (continued)

	March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016		March 31, 2016
	($ in Thousands)
Accruing loans 30-89 days past due:
Commercial and industrial	$	1,675	$	1,413	$	950	$	2,124	$	2,901
Commercial real estate — owner occupied	970		1,384		869		193		520
Commercial and business lending	2,645		2,797		1,819		2,317		3,421
Commercial real estate — investor	1,122		931		630		2,715		1,072
Real estate construction	431		369		402		524		415
Commercial real estate lending	1,553		1,300		1,032		3,239		1,487
Total commercial	4,198		4,097		2,851		5,556		4,908
Residential mortgage	7,243		8,142		6,697		7,382		3,594
Home equity revolving lines of credit	3,332		4,219		4,137		6,075		3,582
Home equity loans junior liens	1,180		1,630		1,336		1,655		2,222
Home equity	4,512		5,849		5,473		7,730		5,804
Other consumer	1,658		3,189		2,046		1,895		1,682
Total consumer	13,413		17,180		14,216		17,007		11,080
Total accruing loans 30-89 days past due	$	17,611	$	21,277	$	17,067	$	22,563	$	15,988
Potential problem loans:
Commercial and industrial	$	218,930	$	227,196	$	351,290	$	379,818	$	328,464
Commercial real estate — owner occupied	58,994		64,524		47,387		45,671		41,107
Commercial and business lending	277,924		291,720		398,677		425,489		369,571
Commercial real estate — investor	49,217		51,228		36,765		25,081		25,385
Real estate construction	10,141		2,465		1,929		2,117		2,422
Commercial real estate lending	59,358		53,693		38,694		27,198		27,807
Total commercial	337,282		345,413		437,371		452,687		397,378
Residential mortgage	2,155		5,615		3,226		3,953		3,488
Home equity revolving lines of credit	46		46		46		62		48
Home equity loans junior liens	174		68		32		32		161
Home equity	220		114		78		94		209
Total consumer	2,375		5,729		3,304		4,047		3,697
Total potential problem loans	$	339,657	$	351,142	$	440,675	$	456,734	$	401,075

Nonaccrual loans: Nonaccrual loans are considered to be one indicator of potential future loan losses. See Note 7 Loans, of the notes to consolidated financial statements for additional nonaccrual loan disclosures. The ratio of nonaccrual loans to total loans at March 31, 2017 was 1.29%, as compared to 1.37% at December 31, 2016 and 1.49% at March 31, 2016. See also sections "Credit Risk" and "Allowance for Credit Losses".

Accruing loans past due 90 days or more: Loans past due 90 days or more but still accruing interest are classified as such where the underlying loans are both well secured (the collateral value is sufficient to cover principal and accrued interest) and are in the process of collection. Accruing loans 90 days or more past due at March 31, 2017 were relatively unchanged from both December 31, 2016 and March 31, 2016.

Restructured loans: Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. See also Note 7 Loans, of the notes to consolidated financial statements for additional restructured loans disclosures.

Potential problem loans: The level of potential problem loans is another predominant factor in determining the relative level of risk in the loan portfolio and in determining the appropriate level of the allowance for loan losses. Potential problem loans are generally defined by management to include loans rated as substandard by management but that are not considered impaired (i.e., nonaccrual loans and accruing troubled debt restructurings); however, there are circumstances present to create doubt as to the ability of the borrower to comply with present repayment terms. The decision of management to include performing loans in potential problem loans does not necessarily mean that the Corporation expects losses to occur, but that management recognizes

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a higher degree of risk associated with these loans. The decrease is primarily due to the improvement of general commercial related credits and oil and gas related credits.

Other real estate owned ("OREO"): OREO decreased to $8 million at March 31, 2017, compared to $10 million at December 31, 2016 and $16 million at March 31, 2016. Management actively seeks to ensure properties held are monitored to minimize the Corporation’s risk of loss.

Other nonperforming assets: Other nonperforming assets were $7 million at both March 31, 2017 and December 31, 2016. The asset represents the Bank's ownership interest in a profit participation agreement in an entity created to own certain oil and gas assets obtained as a result of bankruptcy and liquidation of borrower in partial satisfaction of their loan.

Allowance for Credit Losses

Credit risks within the loan portfolio are inherently different for each loan type. Credit risk is controlled and monitored through the use of lending standards, a thorough review of potential borrowers, and ongoing review of loan payment performance. Active asset quality administration, including early problem loan identification and timely resolution of problems, aids in the management of credit risk and minimization of loan losses. Credit risk management for each loan type is discussed in the section entitled Credit Risk. See Note 7 Loans, for additional disclosures on the allowance for credit losses.

To assess the appropriateness of the allowance for loan losses, an allocation methodology is applied by the Corporation which focuses on evaluation of many factors, including but not limited to: evaluation of facts and issues related to specific loans, management’s ongoing review and grading of the loan portfolio, consideration of historical loan loss and delinquency experience on each portfolio category, trends in past due and nonaccrual loans, the level of potential problem loans, the risk characteristics of the various classifications of loans, changes in the size and character of the loan portfolio, concentrations of loans to specific borrowers or industries, existing economic conditions, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect potential credit losses. Assessing these factors involves significant judgment. Because each of the criteria used is subject to change, the allowance for loan losses is not necessarily indicative of the trend of future loan losses in any particular category. Therefore, management considers the allowance for loan losses a critical accounting policy—See section Critical Accounting Policies, in the Corporation’s 2016 Annual Report on Form 10-K for additional information on allowance for credit losses. See section, "Nonperforming Assets", for a detailed discussion on asset quality. See also Note 7 Loans, of the notes to consolidated financial statements for additional allowance for loan losses disclosures. Table 5 provides information on loan growth and period end loan composition, Table 9 provides additional information regarding nonperforming assets, and Table 10 and Table 11 provide additional information regarding activity in the allowance for loan losses.

The methodology used for the allocation of the allowance for loan losses at March 31, 2017 and December 31, 2016 was generally comparable, whereby the Corporation segregated its loss factors (used for both criticized and non-criticized loans) into a component primarily based on historical loss rates and a component primarily based on other qualitative factors that are probable to affect loan collectability. The allocation methodology consists of the following components: First, a valuation allowance estimate is established for specifically identified commercial and consumer loans determined by the Corporation to be impaired, using discounted cash flows, estimated fair value of underlying collateral, and / or other data available. Second, management allocates the allowance for loan losses with loss factors, for criticized loan pools by loan type as well as for non-criticized loan pools by loan type, primarily based on historical loss rates after considering loan type, historical loss and delinquency experience, and industry statistics. Loans that have been criticized are considered to have a higher risk of default than non-criticized loans, as circumstances were present to support the lower loan grade, warranting higher loss factors. The loss factors applied in the methodology are periodically re-evaluated and adjusted to reflect changes in historical loss levels or other risks. Lastly, management allocates allowance for loan losses to absorb unrecognized losses that may not be provided for by the other components due to other factors evaluated by management, such as limitations within the credit risk grading process, known current economic or business conditions that may not yet show in trends, industry or other concentrations with current issues that impose higher inherent risks than are reflected in the loss factors, and other relevant considerations. The total allowance is available to absorb losses from any segment of the loan portfolio.

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Table 10 Allowance for Credit Losses

	March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016			March 31, 2016
	($ in Thousands)
Allowance for Loan Losses:
Balance at beginning of period	$	278,335		$	269,540		$	267,780		$	277,370		$	274,264
Provision for loan losses	10,000			18,000			20,000			11,000			20,000
Charge offs	(11,854		)	(11,609		)	(28,964		)	(24,621		)	(21,245		)
Recoveries	6,191			2,404			10,724			4,031			4,351
Net charge offs	(5,663		)	(9,205		)	(18,240		)	(20,590		)	(16,894		)
Balance at end of period	$	282,672		$	278,335		$	269,540		$	267,780		$	277,370
Allowance for Unfunded Commitments:
Balance at beginning of period	$	25,400		$	28,400		$	27,400		$	24,400		$	24,400
Provision for unfunded commitments	(1,000		)	(3,000		)	1,000			3,000			—
Balance at end of period	$	24,400		$	25,400		$	28,400		$	27,400		$	24,400
Allowance for credit losses(a)	$	307,072		$	303,735		$	297,940		$	295,180		$	301,770
Provision for credit losses(b)	$	9,000		$	15,000		$	21,000		$	14,000		$	20,000
Net loan (charge offs) recoveries:
Commercial and industrial	$	(4,368	)	$	(6,566	)	$	(16,407	)	$	(18,564	)	$	(14,936	)
Commercial real estate — owner occupied	19			(221		)	(154		)	(20		)	(43		)
Commercial and business lending	(4,349		)	(6,787		)	(16,561		)	(18,584		)	(14,979		)
Commercial real estate — investor	(514		)	5			(564		)	(560		)	1,239
Real estate construction	11			(86		)	(22		)	(219		)	(28		)
Commercial real estate lending	(503		)	(81		)	(586		)	(779		)	1,211
Total commercial	(4,852		)	(6,868		)	(17,147		)	(19,363		)	(13,768		)
Residential mortgage	(128		)	(1,048		)	(540		)	(757		)	(1,232		)
Home equity revolving lines of credit	85			(611		)	36			275			(902		)
Home equity loans junior liens	88			120			89			42			(244		)
Home equity	173			(491		)	125			317			(1,146		)
Other consumer	(856		)	(798		)	(678		)	(787		)	(748		)
Total consumer	(811		)	(2,337		)	(1,093		)	(1,227		)	(3,126		)
Total net charge offs	$	(5,663	)	$	(9,205	)	$	(18,240	)	$	(20,590	)	$	(16,894	)
Ratios:
Allowance for loan losses to total loans	1.40		%	1.39		%	1.36		%	1.35		%	1.44		%
Allowance for loan losses to net charge offs (Annualized)	12.3x			7.6x			3.7x			3.2x			4.1x

(a) Includes the allowance for loan losses and the allowance for unfunded commitments.

(b) Includes the provision for loan losses and the provision for unfunded commitments.

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Table 11 Annualized net (charge offs) recoveries^(a) 

(in basis points)	March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016		March 31, 2016
Net loan (charge offs) recoveries:
Commercial and industrial	(28	)	(40	)	(98	)	(114	)	(97	)
Commercial real estate — owner occupied	1		(10	)	(7	)	(1	)	(2	)
Commercial and business lending	(24	)	(36	)	(87	)	(100	)	(85	)
Commercial real estate — investor	(6	)	N/M		(6	)	(7	)	15
Real estate construction	N/M		(3	)	(1	)	(7	)	(1	)
Commercial real estate lending	(4	)	(1	)	(5	)	(7	)	11
Total commercial	(16	)	(22	)	(55	)	(64	)	(48	)
Residential mortgage	(1	)	(7	)	(3	)	(5	)	(8	)
Home equity revolving lines of credit	4		(29	)	2		13		(41	)
Home equity loans junior liens	39		49		34		15		(83	)
Home equity	8		(21	)	5		13		(46	)
Other consumer	(90	)	(80	)	(67	)	(78	)	(72	)
Total consumer	(4	)	(12	)	(6	)	(7	)	(17	)
Total net charge offs	(11	)	(18	)	(36	)	(42	)	(36	)

(a) Annualized ratio of net charge offs to average loans by loan type.

N/M = Not Meaningful

At March 31, 2017, the allowance for credit losses was $307 million, compared to $304 million at December 31, 2016 and $302 million at March 31, 2016. At March 31, 2017, the allowance for loan losses to total loans was 1.40% and covered 109% of nonaccrual loans, compared to 1.39% and 101%, respectively, at December 31, 2016 and 1.44% and 97%, respectively, at March 31, 2016. Management believes the level of allowance for loan losses to be appropriate at March 31, 2017.

Notable Contributions to the Change in Allowance for Credit Loss

• Total loans increased $93 million during the first quarter of 2017, including a $339 million (4%) increase in total consumer which was partially offset by a $208 million (3%) decrease in commercial and business lending and a $39 million (1%) decrease in commercial real estate lending. Compared to March 31, 2016, total loans increased $920 million (5%), including a $663 million (9%) increase in total consumer and a $507 million (11%) increase in commercial real estate lending, which was partially offset by a $250 million (3%) decrease in commercial and business lending. See section “Loans” for additional information on the changes in the loan portfolio and see section "Credit Risk" for discussion about credit risk management for each loan type.

• Total nonaccrual loans decreased$15 million during the first quarter of 2017, primarily due to the improvement in oil and gas related credits. Nonaccrual loans decreased$26 million from March 31, 2016, primarily due to improvements in general commercial loan portfolio. See also Note 7 Loans, of the notes to consolidated financial statements and section "Nonperforming Assets" for additional disclosures on the changes in asset quality.

• Potential problem loans decreased$11 million from December 31, 2016 and decreased$61 million from March 31, 2016, primarily due to the improvement of general commercial related credits and oil and gas related credits, respectively. See Table 9, for additional information on the changes in potential problem loans.

• Net charge offs decreased$11 million from the first quarter of 2016, primarily due to the charge off of oil and gas credits, and decreased$4 million from the fourth quarter of 2016, primarily due to the charge off of general commercial related credits. See Table 10 and Table 11 for additional information regarding the activity in the allowance for loan losses.

• The allowance for loan losses attributable to oil and gas related credits (included within the commercial and industrial allowance for loan losses) was $42 million at March 31, 2017, compared to $38 million at December 31, 2016 and $49 million at March 31, 2016. See also "Oil and gas lending" within the "Credit Risk" section for additional disclosure.

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Deposits and Customer Funding

Table 12 Period End Deposit and Customer Funding Composition

($ in Thousands)	March 31, 2017				December 31, 2016				September 30, 2016				June 30, 2016				March 31, 2016
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
Noninterest-bearing demand	$	5,338,212	25	%	$	5,392,208	25	%	$	5,337,677	24	%	$	5,039,336	25	%	$	5,272,685	26	%
Savings	1,530,155		7	%	1,431,494		7	%	1,441,187		7	%	1,451,801		7	%	1,426,951		7	%
Interest-bearing demand	4,736,236		22	%	4,687,656		21	%	4,548,390		21	%	3,789,138		19	%	3,698,941		18	%
Money market	8,608,523		39	%	8,770,963		40	%	8,894,357		41	%	8,448,543		42	%	8,718,841		42	%
Brokered CDs	54,993		—	%	52,725		—	%	44,373		—	%	46,268		—	%	41,440		—	%
Other time	1,559,916		7	%	1,553,402		7	%	1,481,728		7	%	1,517,764		7	%	1,526,602		7	%
Total deposits	$	21,828,035	100	%	$	21,888,448	100	%	$	21,747,712	100	%	$	20,292,850	100	%	$	20,685,460	100	%
Customer funding(a)	326,823				300,197				477,607				464,880				508,262
Total deposits and customer funding	$	22,154,858			$	22,188,645			$	22,225,319			$	20,757,730			$	21,193,722
Network transaction deposits(b)	$	3,417,380			$	3,895,467			$	3,730,513			$	3,141,214			$	3,399,054
Total deposits and customer funding, excluding Brokered CDs and network transaction deposits	$	18,682,485			$	18,240,453			$	18,450,433			$	17,570,248			$	17,753,228
Time deposits of more than $250,000	$	244,641			$	234,537			$	149,214			$	151,133			$	144,294
(a) Repurchase sweep agreements with customers from deposit accounts. (b) Included above in interest-bearing demand and money market.

• Deposits are the Corporation’s largest source of funds.

• Total deposits decreased$60 million from December 31, 2016, and increased$1.1 billion (6%) from March 31, 2016, primarily in interest-bearing demand deposits.

• Non-maturity deposit accounts, comprised of savings, money market, and demand (both interest and noninterest-bearing demand) accounts accounted for 93% of our total deposits at March 31, 2017.

• Included in the above amounts were $3.4 billion of network deposits, primarily sourced from other financial institutions and intermediaries. These represented 16% of our total deposits at March 31, 2017.

57

Liquidity

The objective of liquidity risk management is to ensure that the Corporation has the ability to generate sufficient cash or cash equivalents in a timely and cost effective manner to satisfy the cash flow requirements of depositors and borrowers and to meet its other commitments as they become due. The Corporation’s liquidity risk management process is designed to identify, measure, and manage the Corporation’s funding and liquidity risk to meet its daily funding needs in the ordinary course of business, as well as to address expected and unexpected changes in its funding requirements. The Corporation engages in various activities to manage its liquidity risk, including diversifying its funding sources, stress testing, and holding readily-marketable assets which can be used as a source of liquidity, if needed.

The Corporation performs dynamic scenario analysis in accordance with industry best practices. Measures have been established to ensure the Corporation has sufficient high quality short-term liquidity to meet cash flow requirements under stressed scenarios. In addition the Corporation also reviews static measures such as deposit funding as a percent of total assets and liquid asset levels. Strong capital ratios, credit quality, and core earnings are also essential to maintaining cost effective access to wholesale funding markets. At March 31, 2017, the Corporation was in compliance with its internal liquidity objectives and has sufficient asset-based liquidity to meet its obligations under a stressed scenario.

The Corporation maintains diverse and readily available liquidity sources, including:

• Investment securities are an important tool to the Corporation’s liquidity objective, and can be pledged or sold to enhance liquidity, if necessary. See also Note 6 Investment Securities of the notes to consolidated financial statements for additional information on the Corporation's investment securities portfolio, including investment securities pledged.

• The Bank pledges eligible loans to both the Federal Reserve Bank and the FHLB as collateral to establish lines of credit and borrow from these entities. Based on the amount of collateral pledged, the FHLB established a collateral value from which the Bank may draw advances against the collateral. Also, the collateral is used to enable the FHLB to issue letters of credit in favor of public fund depositors of the Bank. As of March 31, 2017, the Bank had $2.9 billion available for future advances. The Federal Reserve Bank also establishes a collateral value of assets to support borrowings from the discount window. As of March 31, 2017, the Bank had $2.2 billion available for discount window borrowings.

• The Parent Company has a $200 million commercial paper program, of which, $122 million was outstanding as of March 31, 2017.

• Dividends and service fees from subsidiaries, as well as the proceeds from issuance of capital are also funding sources for the Parent Company.

• The Parent Company has filed a shelf registration statement with the SEC under which the Parent Company may, from time to time, offer shares of the Corporation’s common stock in connection with acquisitions of businesses, assets or securities of other companies.

• The Parent Company also has filed a universal shelf registration statement with the SEC, under which the Parent Company may offer the following securities, either separately or in units: debt securities, preferred stock, depositary shares, common stock, and warrants.

• The Bank may also issue institutional certificates of deposit, network transaction deposits, and brokered certificates of deposit.

Credit ratings relate to the Corporation’s ability to issue debt securities and the cost to borrow money, and should not be viewed as an indication of future stock performance or a recommendation to buy, sell, or hold securities. Adverse changes in these factors could result in a negative change in credit ratings and impact not only the ability to raise funds in the capital markets but also the cost of these funds. The credit ratings of the Parent Company and the Bank at March 31, 2017 are displayed below.

Table 13 Credit Ratings

	Moody’s	S&P*
Associated Bank short-term deposits	P-1	-
Associated Bank long-term	A1	BBB+
Corporation short-term	P-2	-
Corporation long-term	Baa1	BBB
Outlook	Negative	Stable
* Standard and Poor's

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For the three months ended March 31, 2017, net cash provided by operating activities was $170 million, while financing and investing activities used net cash of $82 million, and $40 million, respectively, for a net increase in cash and cash equivalents of $47 million since year-end 2016. During the first quarter of 2017, assets of $29.1 billion were relatively unchanged compared to year-end 2016. On the funding side, deposits of $21.8 billion were minimally unchanged when compared to year-end 2016.

For the three months ended March 31, 2016, net cash provided by operating and financing activities was $22 million and $405 million, respectively, while investing activities used net cash of $526 million, for a net decrease in cash and cash equivalents of $98 million since year-end 2015. During the first three months of 2016, assets increased to $28.2 billion (up $467 million or 2%)compared to year-end 2015, primarily due to $513 million increase in loans. On the funding side, deposits decreased $322 million while short-term and long-term funding increased $583 million and $185 million, respectively.

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Quantitative and Qualitative Disclosures about Market Risk

Market risk and interest rate risk are managed centrally. Market risk is the potential for loss arising from adverse changes in the fair value of fixed income securities, equity securities, other earning assets and derivative financial instruments as a result of changes in interest rates or other factors. Interest rate risk is the potential for reduced net interest income resulting from adverse changes in the level of interest rates. As a financial institution that engages in transactions involving an array of financial products, the Corporation is exposed to both market risk and interest rate risk. In addition to market risk, interest rate risk is measured and managed through a number of methods. The Corporation uses financial modeling simulation techniques that measure the sensitivity of future earnings due to changing rate environments to measure interest rate risk.

Policies established by the Corporation’s Asset / Liability Committee (“ALCO”) and approved by the Board of Directors are intended to limit these risks. The Board has delegated day-to-day responsibility for managing market and interest rate risk to ALCO. The primary objectives of market risk management is to minimize any adverse effect that changes in market risk factors may have on net interest income and to offset the risk of price changes for certain assets recorded at fair value.

Interest Rate Risk

The primary goal of interest rate risk management is to control exposure to interest rate risk within policy limits approved by the Board of Directors. These limits and guidelines reflect our risk appetite for interest rate risk over both short-term and long-term horizons. No limit breaches occurred during the first three months of 2017.

The major sources of our non-trading interest rate risk are timing differences in the maturity and re-pricing characteristics of assets and liabilities, changes in the shape of the yield curve, and the potential exercise of explicit or embedded options. We measure these risks and their impact by identifying and quantifying exposures through the use of sophisticated simulation and valuation models which are employed by management to understand net interest income (NII) at risk, interest rate sensitive earnings at risk (EAR), and market value of equity (MVE) at risk. These measures show that our interest rate risk profile was slightly asset sensitive at March 31, 2017.

For further discussion of the Corporation's interest rate risk and corresponding key assumptions, see the Interest Rate Risk section of Management’s Discussion and Analysis of Financial Condition and Results of Operations included in the Corporation’s 2016 Annual Report on Form 10-K.

The sensitivity analysis included below is measured as a percentage change in NII and EAR due to instantaneous moves in benchmark interest rates from a baseline scenario. We evaluate the sensitivity using: 1) a dynamic forecast incorporating expected growth in the balance sheet, and 2) a static forecast where the current balance sheet is held constant.

Table 14 Estimated % Change in Net Interest Income Over 12 Months

	Estimated % Change in Rate Sensitive Earnings at Risk (EAR) Over 12 Months
	Dynamic Forecast March 31, 2017		Static Forecast March 31, 2017		Dynamic Forecast December 31, 2016		Static Forecast December 31, 2016
Instantaneous Rate Change
100 bp increase in interest rates	1.5	%	1.9	%	1.4	%	1.5	%
200 bp increase in interest rates	3.0	%	3.6	%	2.7	%	2.9	%

At March 31, 2017, the MVE profile indicates a decline in net balance sheet value due to instantaneous upward changes in rates.

Table 15 Market Value of Equity Sensitivity

	March 31, 2017		December 31, 2016
Instantaneous Rate Change
100 bp increase in interest rates	(2.9	)%	(2.9	)%
200 bp increase in interest rates	(6.2	)%	(6.0	)%

While an instantaneous and severe shift in interest rates was used in this analysis to provide an estimate of exposure under an extremely adverse scenario, the Corporation believes that a gradual shift in interest rates would have a much more modest impact. Since MVE measures the discounted present value of cash flows over the estimated lives of instruments, the change in MVE does not directly correlate to the degree that earnings would be impacted over a shorter time horizon (i.e., the current year). Further,

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MVE does not take into account factors such as future balance sheet growth, changes in product mix, changes in yield curve relationships, and changing product spreads that could mitigate the adverse impact of changes in interest rates.

The above NII, EAR, and MVE measures do not include all actions that management may undertake to manage this risk in response to anticipated changes in interest rates.

Contractual Obligations, Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities

Table 16 Contractual Obligations and Other Commitments

March 31, 2017	One Year or Less		One to Three Years		Three to Five Years		Over Five Years		Total
	($ in Thousands)
Time deposits	$	945,107	$	481,279	$	184,858	$	3,665	$	1,614,909
Short-term funding	1,080,867		—		—		—		1,080,867
Long-term funding	—		2,364,032		150,162		247,761		2,761,955
Operating leases	9,711		18,780		15,469		20,940		64,900
Commitments to extend credit	4,057,372		2,829,683		1,314,321		132,137		8,333,513
Total	$	6,093,057	$	5,693,774	$	1,664,810	$	404,503	$	13,856,144

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 commitments and derivative instruments. A discussion of the Corporation’s derivative instruments at March 31, 2017, is included in Note 10, Derivative and Hedging Activities, of the notes to consolidated financial statements. A discussion of the Corporation’s lending-related commitments is included in Note 12, Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings, of the notes to consolidated financial statements. See also Note 9, Short and Long-Term Funding, of the notes to consolidated financial statements for additional information on the Corporation’s short-term and long-term funding.

Table 16 summarizes significant contractual obligations and other commitments at March 31, 2017, at those amounts contractually due to the recipient, including any premiums or discounts, hedge basis adjustments, or other similar carrying value adjustments.

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Capital

Management actively reviews capital strategies for the Corporation and each of its subsidiaries in light of perceived business risks, future growth opportunities, industry standards, and compliance with regulatory requirements. The assessment of overall capital adequacy depends on a variety of factors, including asset quality, liquidity, stability of earnings, changing competitive forces, economic condition in markets served, and strength of management. At March 31, 2017, the capital ratios of the Corporation and its banking subsidiary were in excess of regulatory minimum requirements. The Corporation’s capital ratios are summarized in Table 17.

Table 17 Capital Ratios

	1Q17			4Q16			3Q16			2Q16			1Q16
	($ in Thousands)
Risk-based Capital (1)
Common equity Tier 1	$	2,085,309		$	2,032,587		$	1,983,770		$	1,940,704		$	1,902,593
Tier 1 capital	2,244,863			2,191,798			2,142,779			2,059,661			2,021,125
Total capital	2,757,310			2,706,760			2,656,648			2,573,941			2,526,653
Total risk-weighted assets	21,128,673			21,340,951			21,264,972			21,168,161			20,453,744
Common equity Tier 1 capital ratio	9.87		%	9.52		%	9.33		%	9.17		%	9.30		%
Tier 1 capital ratio	10.62		%	10.27		%	10.08		%	9.73		%	9.88		%
Total capital ratio	13.05		%	12.68		%	12.49		%	12.16		%	12.35		%
Tier 1 leverage ratio	8.05		%	7.83		%	7.64		%	7.43		%	7.55		%
Selected Equity and Performance Ratios
Stockholders’ equity / assets	10.80		%	10.61		%	10.62		%	10.43		%	10.58		%
Dividend payout ratio (2)	33.33		%	34.29		%	32.35		%	35.48		%	40.74		%

(1) The Federal Reserve establishes regulatory capital requirements, including well-capitalized standards for the Corporation. The Corporation follows Basel III, subject to certain transition provisions. These regulatory capital measurements are used by management, regulators, investors, and analysts to assess, monitor and compare the quality and composition of our capital with the capital of other financial services companies. See Table 18 for a reconciliation of common equity Tier 1 and average common equity Tier 1.

(2) Ratio is based upon basic earnings per common share.

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Table 18 Non-GAAP Measures

	1Q17			4Q16			3Q16			2Q16			1Q16
	($ in Thousands)
Selected Equity and Performance Ratios (1) (2)
Tangible common equity / tangible assets	7.10		%	6.91		%	6.92		%	6.85		%	6.89		%
Return on average equity	7.31		%	7.07		%	7.03		%	6.19		%	5.76		%
Return on average tangible common equity	11.07		%	10.78		%	10.68		%	10.04		%	8.72		%
Return on average Common equity Tier 1	10.61		%	10.45		%	10.52		%	9.86		%	8.55		%
Return on average assets	0.79		%	0.75		%	0.74		%	0.69		%	0.62		%
Average stockholders' equity / average assets	10.85		%	10.67		%	10.52		%	11.13		%	10.73		%
Tangible Common Equity and Common Equity Tier 1 Reconciliation (1)(2)
Common equity	$	2,984,865		$	2,931,383		$	2,937,186		$	2,909,946		$	2,862,151
Goodwill and other intangible assets, net	(987,032		)	(987,328		)	(987,853		)	(988,378		)	(988,917		)
Tangible common equity	$	1,997,833		$	1,944,055		$	1,949,333		$	1,921,568		$	1,873,234
Less: Accumulated other comprehensive income / loss	56,344			54,679			1,254			(13,453		)	(2,167		)
Less: Deferred tax assets/deferred tax liabilities, net	31,132			33,853			33,183			32,589			31,526
Common equity Tier 1	$	2,085,309		$	2,032,587		$	1,983,770		$	1,940,704		$	1,902,593
Tangible Assets Reconciliation (1)
Total assets	$	29,109,857		$	29,139,315		$	29,152,764		$	29,038,699		$	28,178,867
Goodwill and other intangible assets, net	(987,032		)	(987,328		)	(987,853		)	(988,378		)	(988,917		)
Tangible assets	$	28,122,825		$	28,151,987		$	28,164,911		$	28,050,321		$	27,189,950
Average Tangible Common Equity and Average Common Equity Tier 1 Reconciliation (1) (2)
Common equity	$	2,963,462		$	2,924,831		$	2,910,691		$	2,868,772		$	2,849,382
Goodwill and other intangible assets, net	(987,135		)	(987,640		)	(988,171		)	(988,699		)	(989,127		)
Tangible common equity	1,976,327			1,937,191			1,922,520			1,880,073			1,860,255
Less: Accumulated other comprehensive income / loss	54,234			27,922			(2,616		)	1,365			3,320
Less: Deferred tax assets/deferred tax liabilities, net	31,188			33,340			32,712			31,803			32,906
Average common equity Tier 1	$	2,061,749		$	1,998,453		$	1,952,616		$	1,913,241		$	1,896,481
Efficiency Ratio Reconciliation (3)
Federal Reserve efficiency ratio	66.39		%	65.35		%	64.40		%	69.34		%	69.01		%
Fully tax-equivalent adjustment	(1.30		)%	(1.25		)%	(1.21		)%	(1.36		)%	(1.37		)%
Other intangible amortization	(0.20		)%	(0.20		)%	(0.19		)%	(0.21		)%	(0.20		)%
Fully tax-equivalent efficiency ratio	64.89		%	63.90		%	63.00		%	67.77		%	67.44		%

(1) The ratio tangible common equity to tangible assets excludes goodwill and other intangible assets, net, which is a non-GAAP financial measure. This financial measure has been included as it is considered to be a critical metric with which to analyze and evaluate financial condition and capital strength.

(2) The Federal Reserve establishes regulatory capital requirements, including well-capitalized standards for the Corporation. The Corporation follows Basel III, subject to certain transition provisions. These regulatory capital measurements are used by management, regulators, investors, and analysts to assess, monitor and compare the quality and composition of our capital with the capital of other financial services companies.

(3) The efficiency ratio as defined by the Federal Reserve guidance is noninterest expense (which includes the provision for unfunded commitments) divided by the sum of net interest income plus noninterest income, excluding investment securities gains / losses, net. The fully tax-equivalent efficiency ratio is noninterest expense (which includes the provision for unfunded commitments), excluding other intangible amortization, divided by the sum of fully tax-equivalent net interest income plus noninterest income, excluding investment securities gains / losses, net. Management believes the fully tax-equivalent efficiency ratio, which adjusts net interest income for the tax-favored status of certain loans and investment securities, to be the preferred industry measurement as it enhances the comparability of net interest income arising from taxable and tax-exempt sources.

See Part II, Item 2, “Unregistered Sales of Equity Securities and Use of Proceeds,” for additional information on the shares repurchased during the first quarter of 2017.

Sequential Quarter Results

The Corporation reported net income of $56 million for the first quarter of 2017, compared to net income of $55 million for the fourth quarter of 2016. Net income available to common equity was $54 million for the first quarter of 2017 or net income of $0.36 for basic and $0.35 for diluted earnings per common share, respectively. Comparatively, net income available to common equity for the fourth quarter of 2016, was $52 million, or net income of $0.35 for basic and $0.34 for diluted earnings per common share, respectively (see Table 1).

Fully tax-equivalent net interest income for the first quarter of 2017 was $186 million, minimally higher from the fourth quarter of 2016. The Federal funds target rate increased to 0.75%, compared to 0.50% in fourth quarter of 2016. The net interest margin in the first quarter of 2017 was up 4 bp, to 2.84%. Average earning assets decreased $84 million to $26.3 billion in the first quarter of 2017, with average loans up $96 million, while average investments and other short-term investments were down $180 million (primarily in mortgage related securities). On the funding side, average interest-bearing deposits were up $51 million while noninterest-bearing demand deposits were down $328 million. Average short and long-term funding increased $137 million (primarily short-term FHLB advances) (see Table 2).

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The provision for credit losses was $9 million for the first quarter of 2017, down $6 million from the fourth quarter of 2016 (see Table 10). See discussion under sections, Provision for Credit Losses, Nonperforming Assets, and Allowance for Credit Losses.

Noninterest income for the first quarter of 2017 decreased $12 million (13%) to $80 million versus the fourth quarter of 2016. Fee-based revenue increased $3 million (5%) from the fourth quarter of 2016, primarily due to seasonally higher property and casualty insurance commissions. Net mortgage banking income was $5 million, down $7 million from the fourth quarter of 2016, primarily driven by a $3 million unfavorable change in fair value of mortgage derivatives, an increase in mortgage servicing rights expense (primarily due to a $3 million recovery to the valuation reserve in the fourth quarter of 2016 versus none in the first quarter of 2017), and a $1 million decrease in gain on sale of loans. Capital market fees were $4 million for the first quarter of 2017, a decrease of $4 million compared to the fourth quarter of 2016, due to fewer customer hedging transactions, lower valuation gains, and lower loan syndication activity. Investment securities gains decreased $3 million in first quarter of 2017 due to mortgage-related security sales in the fourth quarter of 2016 (see Table 3).

Noninterest expense decreased $5 million (3%) to $174 million. Personnel expense was $104 million for the first quarter of 2017, down $3 million (3%) from the fourth quarter of 2016, primarily attributable to $3 million of severance in the fourth quarter. Occupancy expense increased $2 million, primarily due to increased snow plowing and higher lease terminations and adjustments. Legal and professional fees were $4 million, down $1 million from the fourth quarter of 2016, primarily driven by lower consulting fees. FDIC expense was $8 million, down $1 million from the fourth quarter of 2016. All remaining noninterest expense categories on a combined basis were down $1 million (3%) compared to fourth quarter of 2016 (see Table 4).

For the first quarter of 2017, the Corporation recognized income tax expense of $21 million, compared to income tax expense of $24 million for fourth quarter of 2016. The effective tax rate was 27.31% and 30.07% for the first quarter of 2017 and the fourth quarter of 2016, respectively.

Segment Review

As discussed in Note 15 Segment Reporting of the notes to consolidated financial statements, the Corporation’s reportable segments have been determined based upon its internal profitability reporting system, which is organized by strategic business unit. 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 reportable segments are Corporate and Commercial Specialty; Community, Consumer and Business; and Risk Management and Shared Services.

FTP is an important tool for managing the Corporation’s balance sheet structure and measuring risk-adjusted profitability. By appropriately allocating the cost of funding and contingent liquidity to business units, the FTP process improves product pricing which influences the volume and terms of new business and helps to optimize the risk / reward profile of the balance sheet. This process helps align the Corporation’s funding and contingent liquidity risk with its risk appetite and complements broader liquidity and interest rate risk management programs. FTP methodologies are designed to promote more resilient, sustainable business models and centralize the management of funding and contingent liquidity risks. Through FTP, the Corporation transfers these risks to a central management function that can take advantage of natural off-sets, centralized hedging activities, and a broader view of these risks across business units.

Comparable Quarter Segment Review

The Corporate and Commercial Specialty segment had net income of $35 million for the first quarter of 2017, up $6 million from the comparable quarter in 2016. Segment revenue increased $11 million compared to first quarter of 2016, primarily due to growth in average loan balances and an adjustment of FTP rate assumptions made in the fourth quarter of 2016 that increased FTP to the business units and decreased the FTP to the Risk Management and Shared Services segment. Average loan balances were $10.8 billion for the first quarter of 2017, up $1.1 billion from an average balance of $9.7 billion for first quarter of 2016. The credit provision decreased $1 million to $12 million for the first quarter of 2017, due to improvement in loan credit quality, partially offset by higher provision for growth in the loan portfolio. Average deposit balances were $6.4 billion for the first quarter of 2017, up $502 million from the comparable quarter of 2016. Average allocated capital increased $83 million to $1.1 billion for first quarter of 2017.

The Community, Consumer, and Business Banking segment had net income of $22 million for the first quarter of 2017, up $7 million compared to first quarter of 2016. Segment revenue increased $4 million to $154 million for the first quarter of 2017, primarily due to adjustment of FTP rate assumptions made in fourth quarter 2016 that increased FTP to the business units and decreased the FTP to the Risk Management and Shared Services segment. Total noninterest expense for first quarter of 2017 was $116 million, down $5 million from the comparable quarter of 2016. Average loan balances were $9.1 billion for the first quarter of 2017, relatively unchanged from the comparable quarter of 2016. Average deposits were $11.3 billion for the first quarter of 2017, up $237 million from average deposits of $11.1 billion for the comparable quarter of 2016. Average allocated capital decreased approximately $51 million during for the first quarter of 2017 compared to the first quarter of 2016.

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The Risk Management and Shared Services segment had revenue of $5 million in the first quarter of 2017, a decrease of $10 million from the comparable quarter of 2016. The decrease in net interest income was primarily due to recent increases in the rate environment, as well as an adjustment of FTP rate assumptions made in fourth quarter 2016 that increased the interest income allocated to the lines of business with an offsetting decrease in the interest income allocated to the Risk Management and Shared Services segment to achieve a more neutral internal funding cost variance. The decrease in noninterest income was primarily due to $3 million less net investment securities gains, along with $2 million decreased proceeds from BOLI policy claims from the comparable quarter of 2016. The credit provision decreased $8 million due to improvements in loan credit quality. Average deposits were $3.7 billion for first quarter of 2017, up $152 million versus the comparable quarter of 2016. Average allocated capital increased $133 million to $371 million for first quarter of 2017.

Critical Accounting Policies

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. A discussion of these policies can be found in the "Critical Accounting Policies" section in Management's Discussion and Analysis of Financial Condition and Results of Operations included in the Corporation’s 2016 Annual Report on Form 10-K. There have been no changes in the Corporation's application of critical accounting policies since December 31, 2016.

Future Accounting Pronouncements

New accounting policies adopted by the Corporation are discussed in Note 3 Summary of Significant Accounting Policies, of the notes to consolidated financial statements. The expected impact of accounting pronouncements recently issued or proposed but not yet required to be adopted are displayed in the table below.

Standard	Description	Date of adoption	Effect on financial statements
ASU 2017-07 Compensation — Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost	The FASB issued the update to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost, including a requirement that employers disaggregate the service cost component from the other components of net benefit cost. In addition, the amendments provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment retrospectively to each period presented and prospectively only for the capitalization component. Early adoption is permitted, but should be within the first interim period if interim financial statements are issued.	1st Quarter 2018	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The FASB issued an amendment to simplify the subsequent quantitative measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Entities should apply the amendment prospectively. Early adoption is permitted, including in an interim period, for impairment tests performed after January 1, 2017. The Corporation has not had to perform a step one quantitative analysis since 2012, which concluded no impairment was necessary.	2nd Quarter 2020, consistent with the Corporation's annual impairment test in May of each year.	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 2017-01 Business Combinations (Topic 805): Clarifying the Definition of a Business	The FASB issued amendments to clarify the definition of a business in order to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets versus businesses. The new standard narrows the definition of a business by adding three principal clarifications: (1) If substantially all the fair value of the gross assets in the asset group is concentrated in either a single identifiable asset or group of similar identifiable assets the transaction does not involve a business (2) If the asset group does not include a minimum of an input and a substantive process, it does not represent a business (3) If the integrated set of activities (including its inputs and processes) does not create, or have the ability to create, goods or services to customers, investment income (e,g. dividends or interest) or other revenues, it is not a business. The overall intention is to provide consistency in applying the guidance, reduce the costs of application, and make the definition of a business more operable.	1st Quarter 2018	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.

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Standard	Description	Date of adoption	Effect on financial statements
ASU 2016-18 Statement of Cash Flows (Topic 230): Restricted Cash	The FASB issued an amendment to improve GAAP by providing guidance on the presentation of restricted cash or restricted cash equivalents in the statement of cash flows, in order to reduce diversity in practice. The amendment requires that a statement of cash flow explain the change during the period in the total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included in cash and cash equivalents when reconciling the beginning and end of period total amounts shown on the statement of cash flow. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment retrospectively to each period presented. Early adoption is permitted, including in an interim period.	1st Quarter 2018	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory	The FASB issued an amendment requiring an entity to recognize income tax consequences on an intra-entity transfer of an asset other than inventory at the time the transaction occurs. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. Early adoption is permitted for all entities in the first interim period if an entity issues interim financial statements.	1st Quarter 2018	No material impact expected on our results of operations, financial position, and liquidity.
ASU 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments	The FASB issued an amendment to provide clarification on where to classify cash flows involving certain cash receipts and cash payments. Under the new guidance, cash payments for debt prepayment or debt extinguishment costs should be classified as cash outflows for financing activities. The new guidance also details the specific classification of contingent consideration cash payments made after a business combination depending on the timing of payments. Lastly, cash proceeds received from corporate owned life insurance policies (including BOLI) should be classified as cash inflows from investing, while the cash payments for the premiums may be classified as cash outflows for investing, operating, or a combination of both. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment retrospectively to each period presented. Early adoption is permitted, including in an interim period; however, all of the amendments must be adopted in the same period.	1st Quarter 2018	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The FASB issued an amendment to replace the current incurred loss impairment methodology. Under the new guidance, entities will be required to measure expected credit losses by utilizing forward-looking information to assess an entity's allowance for credit losses. The guidance also requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. This amendment is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. Early adoption is permitted.	1st Quarter 2020	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 2016-02 Leases (Topic 842)	The FASB issued an amendment to provide transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This amendment will require lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: 1) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis; and 2) a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. This amendment is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Entities are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. Early adoption is permitted.	1st Quarter 2019	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.

66

Standard	Description	Date of adoption	Effect on financial statements
ASU 2016-01 Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The FASB issued an amendment to address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This amendment supersedes the guidance to classify equity securities with readily determinable fair values into different categories, requires equity securities to be measured at fair value with changes in the fair value recognized through net income, and simplifies the impairment assessment of equity investments without readily determinable fair values. The amendment requires public business entities that are required to disclose the fair value of financial instruments measured at amortized cost on the balance sheet to measure that fair value using the exit price notion. The amendment requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option. The amendment requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements. The amendment reduces diversity in current practice by clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities are required to apply the amendment by means of a cumulative-effect adjustment as of the beginning of the fiscal year of adoption, with the exception of the amendment related to equity securities without readily determinable fair values, which should be applied prospectively to equity investments that exist as of the date of adoption.	1st Quarter 2018	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 2014-09 Revenue from Contracts with Customers (Topic 606)	The FASB issued an amendment to clarify the principles for recognizing revenue and to develop a common revenue standard. The standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” In applying the revenue model to contracts within its scope, an entity should apply the following steps: (1) Identify the contract(s) with a customer, (2) Identify the performance obligations in the contract, (3) Determine the transaction price, (4) Allocate the transaction price to the performance obligations in the contract, and (5) Recognize revenue when (or as) the entity satisfies a performance obligation. The standard applies to all contracts with customers except those that are within the scope of other topics in the FASB Codification. The standard also requires significantly expanded disclosures about revenue recognition. The FASB continues to release new accounting guidance related to the adoption of this standard, which could impact the Corporation's preliminary materiality analysis and may change the conclusions reached as to the application of this new guidance. The amendment was originally to be effective for annual reporting periods beginning after December 15, 2016 (including interim reporting periods within those periods); however, in July 2015, the FASB approved a one year deferral of the effective date to December 31, 2017. Early application is not permitted.	1st Quarter 2018	More than 69% of the Corporation’s revenue comes from net interest income, and is explicitly out of scope of the guidance. The primary contracts in-scope of the guidance is expected to be service charges on deposit accounts, card-based and other nondeposit fees, trust service fees, brokerage and annuity commissions, and insurance commissions among others. The Corporation is currently in the process of reviewing the noninterest income contracts pertaining to the guidance by analyzing contracts and current accounting practices to determine if a change in accounting practices is appropriate. This comprehensive review is expected to be completed in the third quarter of 2017. The Corporation's preliminary analysis suggests that the adoption of this accounting standard is not expected to have a material impact on the Corporation's consolidated financial statements. We plan to adopt this guidance using the modified retrospective approach and are extensively into our implementation plan.

Recent Developments

On April 25, 2017, the Board of Directors declared a regular quarterly cash dividend of $0.12 per common share, payable on June 15, 2017, to shareholders of record at the close of business on June 1, 2017. The Board of Directors also declared a regular quarterly cash dividend of $0.3828125 per depositary share on Associated Banc-Corp’s 6.125% Series C Perpetual Preferred Stock and a regular quarterly cash dividend of $0.3359375 per depositary share on Associated Banc-Corp’s 5.375% Series D Perpetual Preferred Stock payable on June 15, 2017, to shareholders of record at the close of business on June 1, 2017. These cash dividends have not been reflected in the accompanying consolidated financial statements.

On April 18, 2017, the Bank received a favorable ruling in Associated Bank, N.A, et al v. Commissioner of Revenue in the Minnesota Tax Court regarding a Minnesota franchise tax liability issue for tax years 2007 and 2008. The Bank has reserved approximately $2 million related to the Minnesota franchise tax issue for these years. Subject to a possible appeal by the Minnesota Commissioner of Revenue, other further appellate proceedings, or settlement of the case, some portion or all of this reserve may be released in the second quarter or subsequent periods.

67

ITEM 3.     Quantitative and Qualitative Disclosures About Market Risk

Information required by this item is set forth in Item 2 under the captions “Quantitative and Qualitative Disclosures about Market Risk” and “Interest Rate Risk.”

ITEM 4.     Controls and Procedures

The Corporation maintains disclosure controls and procedures as required under Rule 13a-15 promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to the Corporation’s management, including its Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

As of March 31, 2017 the Corporation’s management carried out an evaluation, under the supervision and with the participation of the Corporation’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of its disclosure controls and procedures. Based on the foregoing, its Chief Executive Officer and Chief Financial Officer concluded that the Corporation’s disclosure controls and procedures were effective as of March 31, 2017.

No changes were made to the Corporation’s internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act of 1934) during the last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Corporation’s internal control over financial reporting.

68

PART II - OTHER INFORMATION

ITEM 1. Legal Proceedings

The information required by this item is set forth in Part I, Item 1 under Note 12 Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings.

ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds

Other than 308,499 shares of common stock repurchased to satisfy minimum tax withholding on settlements of equity compensation awards, the Corporation did not make any common stock or depositary share repurchases during the first quarter of 2017. On April 21, 2015, the Board of Directors authorized the repurchase of up to $125 million of the Corporation's common stock, of which approximately $88 million remained available to repurchase as of March 31, 2017. On August 28, 2015, the Board of Directors authorized the repurchase of up to $10 million of the Series C Preferred Stock, of which all remained available to repurchase as of March 31, 2017. 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.

ITEM 6. Exhibits

(a)    Exhibits:

Exhibit (11), Statement regarding computation of per share earnings. See Note 4 of the notes to consolidated financial statements in Part I Item 1.

Exhibit (31.1), Certification Under Section 302 of Sarbanes-Oxley by Philip B. Flynn, Chief Executive Officer.

Exhibit (31.2), Certification Under Section 302 of Sarbanes-Oxley by Christopher J. Del Moral-Niles, Chief Financial Officer.

Exhibit (32), Certification by the Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of Sarbanes-Oxley.

Exhibit (101), Interactive data files pursuant to Rule 405 of Regulation S-T: (i) Unaudited Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Income, (iii) Unaudited Consolidated Statements of Comprehensive Income, (iv) Unaudited Consolidated Statements of Changes in Stockholders’ Equity, (v) Unaudited Consolidated Statements of Cash Flows, and (vi) Notes to Consolidated Financial Statements.

69

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	ASSOCIATED BANC-CORP
	(Registrant)
Date: April 27, 2017	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer
Date: April 27, 2017	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer
Date: April 27, 2017	/s/ Tammy C. Stadler
	Tammy C. Stadler
	Principal Accounting Officer

70

EX-31.1

Exhibit 31.1

CERTIFICATION UNDER SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

CERTIFICATIONS

I, Philip B. Flynn, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Associated Banc-Corp;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 27, 2017	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION UNDER SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

CERTIFICATIONS

I, Christopher J. Del Moral-Niles, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Associated Banc-Corp;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 27, 2017	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer

EX-32

Exhibit 32

Certification by the Chief Executive Officer and Chief Financial

Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant

to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Associated Banc-Corp, a Wisconsin corporation (the “Company”), does hereby certify that:

1. The accompanying Quarterly Report of the Company on Form 10-Q for the quarter ended March 31, 2017 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. Information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Philip B. Flynn

Philip B. Flynn

Chief Executive Officer

April 27, 2017

/s/ Christopher J. Del Moral-Niles

Christopher J. Del Moral-Niles

Chief Financial Officer

April 27, 2017

XML

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	0000007789
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
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

XML

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.

XML

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

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 1.00	$ 1.00
Common shares, par value	$ 0.01	$ 0.01

XML

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

XML

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)

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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

XML

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

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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.

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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.

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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.

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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.

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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.

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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 Cost		Gross Unrealized Gains		Gross Unrealized Losses			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 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	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.

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Loans

3 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Loans

Loans

The period end loan composition was as follows.

	March 31, 2017		December 31, 2016
	($ 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 Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ 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

XML

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

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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.

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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 Value			Balance Sheet Category
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 Value		Balance Sheet Category	Notional Amount	Fair Value		Balance Sheet Category
Interest rate lock commitments (mortgage)	291,674	1,803		Other assets	285,345	206		Other assets
Forward commitments (mortgage)	100,750	(373	)	Other liabilities	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			—

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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

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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.

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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	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.

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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

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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.

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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

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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.

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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

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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

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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 Cost		Gross Unrealized Gains		Gross Unrealized Losses			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 Cost		Gross Unrealized Gains		Gross Unrealized Losses			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 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	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

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Loans (Tables)

3 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Loan composition

The period end loan composition was as follows.

	March 31, 2017		December 31, 2016
	($ 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 Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ 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

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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

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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

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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 Value			Balance Sheet Category
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 Value		Balance Sheet Category	Notional Amount	Fair Value		Balance Sheet Category
Interest rate lock commitments (mortgage)	291,674	1,803		Other assets	285,345	206		Other assets
Forward commitments (mortgage)	100,750	(373	)	Other liabilities	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			—

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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

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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

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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	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.

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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

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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.

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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

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Acquisitions (Details Textuals) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) acquisition	Mar. 31, 2016 USD ($) acquisition	Dec. 31, 2016 USD ($)
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

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

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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

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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

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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

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Stock-Based Compensation, Restricted Stock Activity (Details)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
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

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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

XML

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

XML

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

XML

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

XML

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($) 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

XML

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

XML

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

XML

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

XML

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

XML

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

XML

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

XML

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($) 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

XML

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($) 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

XML

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

XML

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

XML

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

XML

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

XML

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

XML

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 2022	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 2022	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 2022	23,226
Total Estimated Amortization Expense	$ 61,528

XML

Goodwill and Intangible Assets (Details Textuals) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) acquisition	Mar. 31, 2016 USD ($) acquisition	Dec. 31, 2016 USD ($)
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

XML

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.

XML

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

XML

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%

XML

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)

XML

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)

XML

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

XML

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

XML

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

XML

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

XML

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Details Textuals) $ in Thousands	Jan. 11, 2016 USD ($) complaint	May 22, 2015 USD ($) loan_production_office branch	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
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

XML

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

XML

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

XML

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

XML

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.

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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%

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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

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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

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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