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 June 30, 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 July 27, 2017, was 151,342,987.

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	45
	Item 3. Quantitative and Qualitative Disclosures About Market Risk	73
	Item 4. Controls and Procedures	73
PART II. Other Information
	Item 1. Legal Proceedings	74
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	74
	Item 6. Exhibits	74
	Signatures	75

2

PART I - FINANCIAL INFORMATION
ITEM 1.	Financial Statements:

ASSOCIATED BANC-CORP

Consolidated Balance Sheets

	June 30, 2017			December 31, 2016
	(Unaudited)			(Audited)
	(In Thousands, except share and per share data)
ASSETS
Cash and due from banks	$	396,677		$	446,558
Interest-bearing deposits in other financial institutions	126,232			149,175
Federal funds sold and securities purchased under agreements to resell	43,000			46,500
Investment securities held to maturity, at amortized cost	2,255,395			1,273,536
Investment securities available for sale, at fair value	3,687,470			4,680,226
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	181,180			140,001
Residential loans held for sale(1)	41,620			108,010
Commercial loans held for sale	4,772			12,474
Loans	20,783,069			20,054,716
Allowance for loan losses	(281,101		)	(278,335		)
Loans, net	20,501,968			19,776,381
Premises and equipment, net	328,404			330,315
Goodwill	972,006			971,951
Mortgage servicing rights, net	59,395			61,476
Other intangible assets	14,530			15,377
Trading assets	48,576			52,398
Other assets	1,107,800			1,074,937
Total assets	$	29,769,025		$	29,139,315
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits	$	5,038,162		$	5,392,208
Interest-bearing deposits	16,580,018			16,496,240
Total deposits	21,618,180			21,888,448
Federal funds purchased and securities sold under agreements to repurchase	607,669			508,347
Other short-term funding	794,813			583,688
Long-term funding	3,262,120			2,761,795
Trading liabilities	47,143			51,103
Accrued expenses and other liabilities	247,598			254,622
Total liabilities	26,577,523			26,048,003
Stockholders’ equity
Preferred equity	159,929			159,929
Common equity:
Common stock	1,630			1,630
Surplus	1,474,301			1,459,498
Retained earnings	1,747,632			1,695,764
Accumulated other comprehensive income (loss)	(53,470		)	(54,679		)
Treasury stock, at cost	(138,520		)	(170,830		)
Total common equity	3,031,573			2,931,383
Total stockholders’ equity	3,191,502			3,091,312
Total liabilities and stockholders’ equity	$	29,769,025		$	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	9,181,834			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 June 30,						Six months ended June 30,
	2017			2016			2017			2016
	(In Thousands, except per share data)
INTEREST INCOME
Interest and fees on loans	$	184,246		$	163,059		$	357,895		$	322,715
Interest and dividends on investment securities:
Taxable	23,658			24,270			47,133			49,786
Tax-exempt	8,143			7,894			16,272			15,724
Other interest	1,553			1,318			3,089			2,385
Total interest income	217,600			196,541			424,389			390,610
INTEREST EXPENSE
Interest on deposits	21,180			11,678			38,104			23,444
Interest on Federal funds purchased and securities sold under agreements to repurchase	824			378			1,339			674
Interest on other short-term funding	1,827			845			2,907			1,360
Interest on long-term funding	9,950			6,923			17,946			16,428
Total interest expense	33,781			19,824			60,296			41,906
NET INTEREST INCOME	183,819			176,717			364,093			348,704
Provision for credit losses	12,000			14,000			21,000			34,000
Net interest income after provision for credit losses	171,819			162,717			343,093			314,704
NONINTEREST INCOME
Trust service fees	12,346			11,509			24,281			22,956
Service charges on deposit accounts	16,030			16,444			32,386			32,717
Card-based and other nondeposit fees	13,764			12,717			26,229			24,708
Insurance commissions	20,853			22,005			42,473			43,387
Brokerage and annuity commissions	4,346			4,098			8,679			7,892
Mortgage banking, net	5,027			4,067			9,606			8,271
Capital market fees, net	4,042			3,793			7,925			7,331
Bank owned life insurance income	3,899			2,973			6,514			7,743
Asset gains (losses), net	(466		)	(343		)	(700		)	181
Investment securities gains, net	356			3,116			356			6,214
Other	2,213			1,789			4,492			3,960
Total noninterest income	82,410			82,168			162,241			165,360
NONINTEREST EXPENSE
Personnel expense	104,683			102,129			209,102			203,527
Occupancy	12,832			13,215			28,051			27,017
Equipment	5,234			5,396			10,719			10,842
Technology	15,473			14,450			29,893			28,714
Business development and advertising	7,152			6,591			12,987			14,802
Other intangible amortization	496			539			1,009			1,043
Loan expense	2,974			3,442			5,594			6,663
Legal and professional fees	5,711			4,856			9,877			9,881
Foreclosure / OREO expense, net	1,182			1,330			2,687			3,207
FDIC expense	8,000			8,750			16,000			16,500
Other	12,579			13,662			24,088			26,135
Total noninterest expense	176,316			174,360			350,007			348,331
Income before income taxes	77,913			70,525			155,327			131,733
Income tax expense	19,930			21,434			41,074			40,108
Net income	57,983			49,091			114,253			91,625
Preferred stock dividends	2,339			2,169			4,669			4,367
Net income available to common equity	$	55,644		$	46,922		$	109,584		$	87,258
Earnings per common share:
Basic	$	0.36		$	0.31		$	0.72		$	0.58
Diluted	$	0.36		$	0.31		$	0.71		$	0.58
Average common shares outstanding:
Basic	151,573			148,511			151,196			148,556
Diluted	154,302			149,530			154,147			149,518

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 June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	($ in Thousands)
Net income	$	57,983		$	49,091		$	114,253		$	91,625
Other comprehensive income, net of tax:
Investment securities available for sale:
Net unrealized gains	15,218			22,321			18,370			82,743
Net unrealized loss on available for sale securities transferred to held to maturity securities	(9,474		)	—			(14,738		)	—
Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities	(1,548		)	(1,452		)	(2,575		)	(3,024		)
Reclassification adjustment for net gains realized in net income (1)	—			(3,116		)	—			(6,214		)
Income tax expense	(1,601		)	(6,773		)	(406		)	(28,048		)
Other comprehensive income on investment securities available for sale	2,595			10,980			651			45,457
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	(37		)	12			(75		)	25
Amortization of actuarial loss	487			483			975			965
Income tax expense	(171		)	(189		)	(342		)	(378		)
Other comprehensive income on pension and postretirement obligations	279			306			558			612
Total other comprehensive income	2,874			11,286			1,209			46,069
Comprehensive income	$	60,857		$	60,377		$	115,462		$	137,694

(1) Includes only available for sale securities.

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	—			—			—			91,625			—			—			91,625
Other comprehensive income	—			—			—			—			46,069			—			46,069
Comprehensive income																			137,694
Common stock issued:
Stock-based compensation plans, net	—			—			1,153			(17,478		)	—			20,601			4,276
Purchase of common stock returned to authorized but unissued	—			(12		)	(19,995		)	—			—			—			(20,007		)
Purchase of treasury stock	—			—			—			—			—			(4,018		)	(4,018		)
Cash dividends:
Common stock, $0.22 per share	—			—			—			(33,034		)	—			—			(33,034		)
Preferred stock	—			—			—			(4,367		)	—			—			(4,367		)
Purchase of preferred stock	(1,178		)	—			—			(70		)	—			—			(1,248		)
Stock-based compensation expense, net	—			—			13,210			—			—			—			13,210
Tax impact of stock-based compensation	—			—			395			—			—			—			395
Balance, June 30, 2016	$	120,201		$	1,630		$	1,453,285		$	1,629,915		$	13,453		$	(188,337	)	$	3,030,147
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	—			—			—			114,253			—			—			114,253
Other comprehensive income	—			—			—			—			1,209			—			1,209
Comprehensive income																			115,462
Common stock issued:
Stock-based compensation plans, net	—			—			1,102			(20,912		)	—			40,755			20,945
Purchase of treasury stock	—			—			—			—			—			(8,445		)	(8,445		)
Cash dividends:
Common stock, $0.24 per share	—			—			—			(36,804		)	—			—			(36,804		)
Preferred stock	—			—			—			(4,669		)	—			—			(4,669		)
Stock-based compensation expense, net	—			—			12,667			—			—			—			12,667
Other	—			—			1,034			—			—			—			1,034
Balance, June 30, 2017	$	159,929		$	1,630		$	1,474,301		$	1,747,632		$	(53,470	)	$	(138,520	)	$	3,191,502

See accompanying notes to consolidated financial statements.

6

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Cash Flows (Unaudited)

	Six Months Ended June 30,
	2017			2016
	($ in Thousands)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	114,253		$	91,625
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	21,000			34,000
Depreciation and amortization	23,241			22,914
Addition to valuation allowance on mortgage servicing rights, net	275			2,120
Amortization of mortgage servicing rights	5,084			5,896
Amortization of other intangible assets	1,009			1,043
Amortization and accretion on earning assets, funding, and other, net	17,889			22,045
Tax impact of stock based compensation	4,035			395
Gain on sales of investment securities, net	(356		)	(6,214		)
Asset (gains) losses, net	700			(181		)
(Gain) loss on mortgage banking activities, net	4,287			(7,058		)
Mortgage loans originated and acquired for sale	(220,284		)	(517,838		)
Proceeds from sales of mortgage loans held for sale	364,128			491,980
Increase in interest receivable	(757		)	(4,875		)
Increase (decrease) in interest payable	2,653			(4,739		)
Net change in other assets and other liabilities	(38,650		)	(25,836		)
Net cash provided by operating activities	298,507			105,277
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(819,198		)	(1,281,291		)
Purchases of:
Available for sale securities	(417,397		)	(495,453		)
Held to maturity securities	(70,969		)	(112,226		)
Federal Home Loan Bank and Federal Reserve Bank stocks	(166,869		)	(67,261		)
Premises, equipment, and software, net of disposals	(19,289		)	(81,461		)
Other assets	(6,498		)	(3,073		)
Proceeds from:
Sales of available for sale securities	—			359,484
Sales of held to maturity securities	16,059			—
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks	125,690			20,000
Prepayments, calls, and maturities of available for sale investment securities	389,251			371,440
Prepayments, calls, and maturities of held to maturity investment securities	80,976			37,172
Sales, prepayments, calls, and maturities of other assets	6,353			13,362
Net cash paid in acquisition	(217		)	(685		)
Net cash used in investing activities	(882,108		)	(1,239,992		)
CASH FLOWS FROM FINANCING ACTIVITIES
Net decrease in deposits	(270,268		)	(714,815		)
Net increase in short-term funding	310,447			1,077,141
Repayment of long-term funding	(12		)	(430,018		)
Proceeds from issuance of long-term funding	500,000			1,265,000
Proceeds from issuance of common stock for stock-based compensation plans	20,945			4,276
Purchase of preferred stock	—			(1,248		)
Purchase of common stock returned to authorized but unissued	—			(20,007		)
Purchase of treasury stock for tax withholding	(8,445		)	(4,018		)
Cash dividends on common stock	(36,804		)	(33,034		)
Cash dividends on preferred stock	(4,669		)	(4,367		)
Net cash provided (used) by financing activities	511,194			1,138,910
Net increase (decrease) in cash and cash equivalents	(72,407		)	4,195
Cash and cash equivalents at beginning of period	642,233			473,685
Cash and cash equivalents at end of period	$	569,826		$	477,880
Supplemental disclosures of cash flow information:
Cash paid for interest	$	57,306		$	46,316
Cash paid for income taxes	27,461			27,852
Loans and bank premises transferred to other real estate owned	3,267			4,704
Capitalized mortgage servicing rights	3,278			4,149
Loans transferred into held for sale from portfolio, net	62,264			130,694
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 for 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 and unvested restricted stock awards) and common stock warrants. Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
	(In thousands, except per share data)
Net income	$	57,983		$	49,091		$	114,253		$	91,625
Preferred stock dividends	(2,339		)	(2,169		)	(4,669		)	(4,367		)
Net income available to common equity	$	55,644		$	46,922		$	109,584		$	87,258
Common shareholder dividends	(18,326		)	(16,443		)	(36,577		)	(32,646		)
Unvested share-based payment awards	(110		)	(182		)	(227		)	(388		)
Undistributed earnings	$	37,208		$	30,297		$	72,780		$	54,224
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Undistributed earnings allocated to unvested share-based payment awards	228			334			507			575
Undistributed earnings	$	37,208		$	30,297		$	72,780		$	54,224
Basic
Distributed earnings to common shareholders	$	18,326		$	16,443		$	36,577		$	32,646
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Total common shareholders earnings, basic	$	55,306		$	46,406		$	108,850		$	86,295
Diluted
Distributed earnings to common shareholders	$	18,326		$	16,443		$	36,577		$	32,646
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Total common shareholders earnings, diluted	$	55,306		$	46,406		$	108,850		$	86,295
Weighted average common shares outstanding	151,573			148,511			151,196			148,556
Effect of dilutive common stock awards	1,958			1,019			2,155			962
Effect of dilutive common stock warrants	771			—			796			—
Diluted weighted average common shares outstanding	154,302			149,530			154,147			149,518
Basic earnings per common share	$	0.36		$	0.31		$	0.72		$	0.58
Diluted earnings per common share	$	0.36		$	0.31		$	0.71		$	0.58

Anti-dilutive common stock options of approximately 1 million and 4 million for the three months ended June 30, 2017 and 2016, respectively, and 900,000 and 4 million for the six months ended June 30, 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 and six months ended June 30, 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 six 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 six months ended June 30, 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	(1,217,640	)	16.27
Forfeited or expired	(447,751	)	33.58
Outstanding at June 30, 2017	5,492,010		$	18.10	6.80	$	39,339
Options Exercisable at June 30, 2017	3,120,596		$	16.53	5.47	$	27,075

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 six months ended June 30, 2017, the intrinsic value of stock options exercised was approximately $11 million. For the six months ended June 30, 2016, the intrinsic value of the stock options exercised was $1 million. The total fair value of stock options vested was $4 million and $3 million, respectively, for the six months ended June 30, 2017 and June 30, 2016. The Corporation recognized compensation expense for the vesting of stock options of $2 million for both the six months ended June 30, 2017 and June 30, 2016. Included in compensation expense for 2017 was approximately $570,000 of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At June 30, 2017, the Corporation had approximately $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 first quarter 2021.

The following table summarizes information about the Corporation’s restricted stock activity for the six months ended June 30, 2017.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	2,377,380		$	17.40
Granted	737,080		25.58
Vested	(851,381	)	17.88
Forfeited	(61,616	)	18.41
Outstanding at June 30, 2017	2,201,463		$	19.94

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 $11 million were recorded for both the six months ended June 30, 2017 and June 30, 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 $26 million of unrecognized compensation costs related to restricted stock awards at June 30, 2017, that is expected to be recognized over the remaining requisite service periods that extend predominantly through the first quarter 2021.

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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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.

June 30, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,004	$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	534,058		13,873		(1,406		)	546,525
GNMA	1,729,386		1,894		(17,102		)	1,714,178
Private-label	1,102		—		(16		)	1,086
GNMA commercial mortgage-related securities	1,443,501		74		(23,703		)	1,419,872
Other securities (debt and equity)	4,718		116		(27		)	4,807
Total investment securities available for sale	$	3,713,769	$	15,957	$	(42,256	)	$	3,687,470
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,162,920	$	13,766	$	(4,320	)	$	1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	43,575		430		(566		)	43,439
GNMA	473,517		4,048		(3,214		)	474,351
GNMA commercial mortgage-related securities	575,383		8,964		(11,181		)	573,166
Total investment securities held to maturity	$	2,255,395	$	27,208	$	(19,281	)	$	2,263,322

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

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The amortized cost and fair values of investment securities available for sale and held to maturity at June 30, 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
	Amortized Cost		Fair Value			Amortized Cost		Fair Value
	($ in Thousands)
Due in one year or less	$	1,500	$	1,506		$	41,085	$	33,447
Due after one year through five years	4,204		4,175			239,986		246,760
Due after five years through ten years	—		—			261,149		265,255
Due after ten years	—		—			620,700		626,904
Total debt securities	5,704		5,681			1,162,920		1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	534,058		546,525			43,575		43,439
GNMA	1,729,386		1,714,178			473,517		474,351
Private-label	1,102		1,086			—		—
GNMA commercial mortgage-related securities	1,443,501		1,419,872			575,383		573,166
Equity securities	18		128			—		—
Total investment securities	$	3,713,769	$	3,687,470		$	2,255,395	$	2,263,322
Ratio of Fair Value to Amortized Cost			99.3		%			100.4		%

During the first six months of 2017, the Corporation reclassified approximately $1 billion of GNMA residential mortgage-related securities and GNMA commercial mortgage-related securities from available for sale to held to maturity. The GNMA residential and commercial mortgage-related securities are principally securities with a CRA component in the underlying collateral. 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.

The proceeds from the sale of investment securities for the first six months ended June 30, 2017 and 2016 are shown below.

	Six Months Ended June 30,
	2017			2016
	($ in Thousands)
Gross gains on available for sale securities	$	—		$	6,403
Gross gains on held to maturity securities	361			—
Total gains	361			6,403
Gross losses on available for sale securities	—			(189		)
Gross losses on held to maturity securities	$	(5	)	$	—
Total losses	$	(5	)	$	(189	)
Investment securities gains, net	$	356		$	6,214
Proceeds from sales of investment securities	$	16,059		$	359,484

During the first six months of 2017, the Corporation sold approximately $16 million of municipal securities classified as held to maturity due to credit concerns stemming from budgetary pressure and continued credit rating deterioration concerns in the State of Illinois. These sales resulted in a net gain of approximately $356,000.

Investment securities with a carrying value of approximately $2 billion and $1.8 billion at June 30, 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 June 30, 2017.

	Less than 12 months						12 months or more						Total
June 30, 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:
U.S. Treasury securities	1	$	(2	)	$	1,002	—	$	—		$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	18	(1,406		)	223,326		—	—			—		(1,406		)	223,326
GNMA	42	(16,220		)	1,186,468		1	(882		)	35,695		(17,102		)	1,222,163
Private-label	—	—			—		1	(16		)	1,084		(16		)	1,084
GNMA commercial mortgage-related securities	54	(8,627		)	850,180		31	(15,076		)	496,698		(23,703		)	1,346,878
Other securities (debt and equity)	3	(27		)	2,173		—	—			—		(27		)	2,173
Total	118	$	(26,282	)	$	2,263,149	33	$	(15,974	)	$	533,477	$	(42,256	)	$	2,796,626
Investment securities held to maturity:
Municipal securities	301	$	(4,186	)	$	222,642	9	$	(134	)	$	4,814	$	(4,320	)	$	227,456
Residential mortgage-related securities:
FNMA / FHLMC	18	(377		)	25,507		1	(189		)	5,657		(566		)	31,164
GNMA	45	(3,192		)	358,551		1	(22		)	1,246		(3,214		)	359,797
GNMA commercial mortgage-related securities	14	(3,683		)	301,594		10	(7,498		)	241,385		(11,181		)	542,979
Total	378	$	(11,438	)	$	908,294	21	$	(7,843	)	$	253,102	$	(19,281	)	$	1,161,396

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 June 30, 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 June 30, 2017, and December 31, 2016, the Corporation had FHLB stock of $106 million and $65 million, respectively. The Corporation had Federal Reserve Bank stock of $76 million and $75 million at June 30, 2017 and December 31, 2016, respectively.

Note 7Loans

The period end loan composition was as follows.

	June 30, 2017		December 31, 2016
	($ in Thousands)
Commercial and industrial	$	6,571,000	$	6,489,014
Commercial real estate — owner occupied	845,336		897,724
Commercial and business lending	7,416,336		7,386,738
Commercial real estate — investor	3,329,585		3,574,732
Real estate construction	1,651,805		1,432,497
Commercial real estate lending	4,981,390		5,007,229
Total commercial	12,397,726		12,393,967
Residential mortgage	7,115,457		6,332,327
Home equity	897,111		934,443
Other consumer	372,775		393,979
Total consumer	8,385,343		7,660,749
Total loans	$	20,783,069	$	20,054,716

The following table presents commercial and consumer loans by credit quality indicator at June 30, 2017.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,183,037	$	103,881	$	142,607	$	141,475	$	6,571,000
Commercial real estate - owner occupied	754,446		14,366		60,724		15,800		845,336
Commercial and business lending	6,937,483		118,247		203,331		157,275		7,416,336
Commercial real estate - investor	3,260,187		13,623		48,569		7,206		3,329,585
Real estate construction	1,621,198		19,989		8,901		1,717		1,651,805
Commercial real estate lending	4,881,385		33,612		57,470		8,923		4,981,390
Total commercial	11,818,868		151,859		260,801		166,198		12,397,726
Residential mortgage	7,060,673		1,233		1,576		51,975		7,115,457
Home equity	882,253		1,168		208		13,482		897,111
Other consumer	372,018		524		—		233		372,775
Total consumer	8,314,944		2,925		1,784		65,690		8,385,343
Total	$	20,133,812	$	154,784	$	262,585	$	231,888	$	20,783,069

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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 June 30, 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	$	6,428,022	$	1,042	$	213	$	248	$	141,475	$	6,571,000
Commercial real estate - owner occupied	828,252		1,136		148		—		15,800		845,336
Commercial and business lending	7,256,274		2,178		361		248		157,275		7,416,336
Commercial real estate - investor	3,321,480		899		—		—		7,206		3,329,585
Real estate construction	1,649,953		40		95		—		1,717		1,651,805
Commercial real estate lending	4,971,433		939		95		—		8,923		4,981,390
Total commercial	12,227,707		3,117		456		248		166,198		12,397,726
Residential mortgage	7,054,317		8,163		1,002		—		51,975		7,115,457
Home equity	877,705		4,755		1,169		—		13,482		897,111
Other consumer	369,509		1,113		633		1,287		233		372,775
Total consumer	8,301,531		14,031		2,804		1,287		65,690		8,385,343
Total	$	20,529,238	$	17,148	$	3,260	$	1,535	$	231,888	$	20,783,069

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2017 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$180 million or 78% were current with respect to payment at June 30, 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 June 30, 2017.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	89,563	$	94,231	$	17,882	$	95,205	$	635
Commercial real estate — owner occupied	7,249		9,154		526		6,086		93
Commercial and business lending	96,812		103,385		18,408		101,291		728
Commercial real estate — investor	15,832		16,111		330		15,782		767
Real estate construction	1,819		2,188		707		1,868		54
Commercial real estate lending	17,651		18,299		1,037		17,650		821
Total commercial	114,463		121,684		19,445		118,941		1,549
Residential mortgage	60,209		65,163		10,649		60,831		1,112
Home equity	20,927		22,907		9,665		21,232		484
Other consumer	1,315		1,342		229		1,335		12
Total consumer	82,451		89,412		20,543		83,398		1,608
Total loans(a)	$	196,914	$	211,096	$	39,988	$	202,339	$	3,157
Loans with no related allowance
Commercial and industrial	$	83,452	$	107,471	$	—	$	104,989	$	173
Commercial real estate — owner occupied	12,696		13,546		—		12,906		49
Commercial and business lending	96,148		121,017		—		117,895		222
Commercial real estate — investor	6,002		6,466		—		6,071		—
Real estate construction	219		222		—		222		—
Commercial real estate lending	6,221		6,688		—		6,293		—
Total commercial	102,369		127,705		—		124,188		222
Residential mortgage	9,390		10,246		—		9,461		101
Home equity	540		543		—		540		—
Other consumer	—		—		—		—		—
Total consumer	9,930		10,789		—		10,001		101
Total loans(a)	$	112,299	$	138,494	$	—	$	134,189	$	323
Total
Commercial and industrial	$	173,015	$	201,702	$	17,882	$	200,194	$	808
Commercial real estate — owner occupied	19,945		22,700		526		18,992		142
Commercial and business lending	192,960		224,402		18,408		219,186		950
Commercial real estate — investor	21,834		22,577		330		21,853		767
Real estate construction	2,038		2,410		707		2,090		54
Commercial real estate lending	23,872		24,987		1,037		23,943		821
Total commercial	216,832		249,389		19,445		243,129		1,771
Residential mortgage	69,599		75,409		10,649		70,292		1,213
Home equity	21,467		23,450		9,665		21,772		484
Other consumer	1,315		1,342		229		1,335		12
Total consumer	92,381		100,201		20,543		93,399		1,709
Total loans(a)	$	309,213	$	349,590	$	39,988	$	336,528	$	3,480

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 77% of the unpaid principal balance at June 30, 2017.

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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.

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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 $35 million in loans modified in troubled debt restructurings for the six months ended June 30, 2017, of which approximately $6 million was in accrual status and $29 million was in nonaccrual pending a sustained period of repayment. During the six months ended June 30, 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 June 30, 2017 and December 31, 2016. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	June 30, 2017				December 31, 2016
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	31,540	$	27,016	$	31,884	$	1,276
Commercial real estate — owner occupied	4,145		2,145		5,490		2,220
Commercial real estate — investor	14,628		602		15,289		924
Real estate construction	321		164		359		150
Residential mortgage	17,624		19,365		18,100		21,906
Home equity	7,985		2,401		7,756		2,877
Other consumer	1,082		22		979		32
Total	$	77,325	$	51,715	$	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 six months ended June 30, 2017 and 2016, respectively, and the recorded investment and unpaid principal balance as of June 30, 2017 and 2016 respectively.

	Six Months Ended June 30, 2017					Six Months Ended June 30, 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	24	$	30,935	$	52,260	11	$	2,608	$	2,676
Commercial real estate — owner occupied	2	716		716		1	120		126
Residential mortgage	36	2,695		2,805		48	3,942		4,171
Home equity	26	674		919		37	1,433		1,554
Total	88	$	35,020	$	56,700	97	$	8,103	$	8,527

(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 six months ended June 30, 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 six months ended June 30, 2017.

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The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the six months ended June 30, 2017 and 2016, respectively, as well as the recorded investment in these restructured loans as of June 30, 2017 and 2016, respectively.

	Six Months Ended June 30, 2017			Six Months Ended June 30, 2016
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate — owner occupied	—	$	—	2	$	168
Residential mortgage	17	941		25	2,407
Home equity	9	271		11	164
Total	26	$	1,212	38	$	2,739

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 six months ended June 30, 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	(21,912		)	(83		)	(803		)	(62		)	(1,034		)	(1,196		)	(2,140		)	(27,230		)
Recoveries	6,498			145			163			47			342			1,423			378			8,996
Net charge offs	(15,414		)	62			(640		)	(15		)	(692		)	227			(1,762		)	(18,234		)
Provision for loan losses	18,295			(5,551		)	(3,155		)	4,571			5,212			(351		)	1,979			21,000
June 30, 2017	$	143,007		$	8,545		$	41,490		$	31,488		$	31,566		$	20,240		$	4,765		$	281,101
Allowance for loan losses:
Impaired loans:
Individually evaluated	$	17,350		$	187		$	183		$	—		$	106		$	—		$	—		$	17,826
Collectively evaluated	532			339			147			707			10,543			9,665			229			22,162
Total impaired loans	17,882			526			330			707			10,649			9,665			229			39,988
Non-impaired loans:
Collectively evaluated	125,125			8,019			41,160			30,781			20,917			10,575			4,536			241,113
Total	$	143,007		$	8,545		$	41,490		$	31,488		$	31,566		$	20,240		$	4,765		$	281,101
Period end loan balances:
Impaired loans:
Individually evaluated	$	140,061		$	15,303		$	6,799		$	220		$	11,060		$	643		$	—		$	174,086
Collectively evaluated	32,954			4,642			15,035			1,818			58,539			20,824			1,315			135,127
Total impaired loans	173,015			19,945			21,834			2,038			69,599			21,467			1,315			309,213
Non-impaired loans:
Collectively evaluated	6,397,985			825,391			3,307,751			1,649,767			7,045,858			875,644			371,460			20,473,856
Total	$	6,571,000		$	845,336		$	3,329,585		$	1,651,805		$	7,115,457		$	897,111		$	372,775		$	20,783,069

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.

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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:
Impaired loans:
Individually evaluated	$	20,836		$	—		$	3,117		$	—		$	147		$	3		$	—		$	24,103
Collectively evaluated	781			295			424			441			10,944			9,309			186			22,380
Total impaired loans	21,617			295			3,541			441			11,091			9,312			186			46,483
Non-impaired loans:
Collectively evaluated	118,509			13,739			41,744			26,491			15,955			11,052			4,362			231,852
Total	$	140,126		$	14,034		$	45,285		$	26,932		$	27,046		$	20,364		$	4,548		$	278,335
Period end loan balances:
Impaired loans:
Individually evaluated	$	180,965		$	8,439		$	17,322		$	—		$	7,033		$	650		$	—		$	214,409
Collectively evaluated	34,290			6,595			16,018			1,203			61,303			20,107			1,235			140,751
Total impaired loans	215,255			15,034			33,340			1,203			68,336			20,757			1,235			355,160
Non-impaired loans:
Collectively evaluated	6,273,759			882,690			3,541,392			1,431,294			6,263,991			913,686			392,744			19,699,556
Total	$	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.

	Six Months Ended June 30, 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
Balance at end of period	$	25,400	$	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 2017, 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 2017 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

22

analysis was not required. There were no events since the May 2017 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2016 or the first six months of 2017.

At both June 30, 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	4,385
Accumulated amortization	(4,385		)	(4,273		)
Net book value	$	—		$	112
Amortization during the year	$	112		$	281
Other intangibles:
Gross carrying amount	$	32,572		$	32,410
Accumulated amortization	(18,042		)	(17,145		)
Net book value	$	14,530		$	15,265
Additions during the period	$	162		$	1,012
Amortization during the year	$	897		$	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 at minimum quarterly 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.

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A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,085		$	62,150
Additions	3,278			12,262
Amortization	(5,084		)	(12,327		)
Mortgage servicing rights at end of period	$	60,279		$	62,085
Valuation allowance at beginning of period	(609		)	(809		)
(Additions) recoveries, net	(275		)	200
Valuation allowance at end of period	(884		)	(609		)
Mortgage servicing rights, net	$	59,395		$	61,476
Fair value of mortgage servicing rights	$	64,627		$	73,149
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,768,374		$	7,974,742
Mortgage servicing rights, net to servicing portfolio	0.76		%	0.77		%
Mortgage servicing rights expense (a)	$	5,359		$	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 June 30, 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	Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Six months ending December 31, 2017	$	901	$	5,046
2018	1,771		8,897
2019	1,472		7,476
2020	1,355		6,292
2021	1,331		5,315
2022	1,308		4,515
Beyond 2022	6,392		22,738
Total Estimated Amortization Expense	$	14,530	$	60,279

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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.

	June 30, 2017			December 31, 2016
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	345,350		$	208,150
Securities sold under agreements to repurchase	262,319			300,197
Federal funds purchased and securities sold under agreements to repurchase	$	607,669		$	508,347
FHLB advances	697,000			482,000
Commercial paper	97,813			101,688
Other short-term funding	794,813			583,688
Total short-term funding	$	1,402,482		$	1,092,035
Long-Term Funding
FHLB advances	$	2,765,176		$	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	(3,056		)	(3,393		)
Total long-term funding	3,262,120			2,761,795
Total short and long-term funding	$	4,664,602		$	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 June 30, 2017, the Corporation pledged agency mortgage-related securities with a fair value of $381 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 June 30, 2017 and December 31, 2016 are presented in the following table.

	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 days		30-90 days		Greater than 90 days		Total
June 30, 2017					($ in Thousands)
Repurchase agreements
Agency mortgage-related securities	$	262,319	$	—	$	—	$	—	$	262,319
Total	$	262,319	$	—	$	—	$	—	$	262,319
December 31, 2016
Repurchase agreements
Agency mortgage-related securities	$	300,197	$	—	$	—	$	—	$	300,197
Total	$	300,197	$	—	$	—	$	—	$	300,197

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Long-Term Funding

FHLB advances: At June 30, 2017, the long-term FHLB advances had a weighted average interest rate of 0.98%, 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 $22 million of investment securities as collateral at June 30, 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 June 30, 2017 the Corporation posted $1 million cash collateral for the margin compared to none at December 31, 2016.

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.

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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.

	June 30, 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	$	2,118,409	$	28,105		Trading assets	$	2,039,323	$	33,671		Trading assets
Interest rate-related instruments — customer and mirror	2,118,409		(27,691		)	Trading liabilities	2,039,323		(33,188		)	Trading liabilities
Foreign currency exchange forwards	93,300		1,480			Trading assets	109,675		2,002			Trading assets
Foreign currency exchange forwards	92,969		(1,412		)	Trading liabilities	106,251		(1,943		)	Trading liabilities
Commodity contracts	304,554		18,991			Trading assets	127,582		16,725			Trading assets
Commodity contracts	303,790		(18,040		)	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.

	June 30, 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)	356,798	2,680		Other assets	285,345	206		Other assets
Forward commitments (mortgage)	151,500	159		Other assets	179,600	2,908		Other assets
Purchased options (time deposit)	75,899	1,531		Other assets	80,554	2,576		Other assets
Written options (time deposit)	75,899	(1,531	)	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 Six Months Ended June 30,
($ in Thousands)		2017			2016
Derivative Instruments:
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(69	)	$	(1,426	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	2,474			3,312
Forward commitments (mortgage)	Mortgage banking, net	(2,749		)	(4,608		)
Foreign currency exchange forwards	Capital market fees, net	9			(48		)
Commodity contracts	Capital market fees, net	198			358

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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)
June 30, 2017
Derivative assets:
Interest and commodity agreements	$	24,322	$	—	$	24,322	$	(16,517	)	$	(7,805	)	$	—
Derivative liabilities:
Interest and commodity agreements	$	16,517	$	—	$	16,517	$	(16,517	)	$	—		$	—
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, Legal Proceedings and Regulatory Matters

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.

	June 30, 2017		December 31, 2016
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	8,063,899	$	8,131,131
Commercial letters of credit(a)	5,839		7,923
Standby letters of credit(c)	242,144		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 June 30, 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 $2 million at June 30, 2017 and $3 million at 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 $25 million at both June 30, 2017 and 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 June 30, 2017, was $114 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 $84 million at June 30, 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.

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.

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Regulatory Matters

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 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.

On March 27, 2017, the Bank received a Community Reinvestment Act ("CRA") rating from the Office of the Comptroller of the Currency of "Satisfactory" for the period from January 1, 2011 through July 27, 2015. As a result of this rating, the restrictions on certain of the Bank's activities that had been imposed under the previous "Needs to Improve" CRA rating are no longer applicable.

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 $367,000 and $2 million during the six months ended June 30, 2017 and the year ended December 31, 2016, respectively. The loss reimbursement and settlement claims paid for the six months ended June 30, 2017 and the year ended December 31, 2016, respectively were negligible. Make whole requests during 2016 and the first six months of 2017 generally arose from loans sold during the period of January 1, 2012 to June 30, 2017, which totaled $9.5 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of June 30, 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Balance at beginning of period	$	900		$	1,197
Repurchase provision expense	109			456
Adjustments to provision expense	—			(750		)
Charge offs, net	(18		)	(3		)
Balance at end of period	$	991		$	900

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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 June 30, 2017, and December 31, 2016, there were approximately $74 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 June 30, 2017 and December 31, 2016, there were $85 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.

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.

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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 June 30, 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.

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The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Hierarchy	June 30, 2017		December 31, 2016
		($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	Level 1	$	1,002	$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	Level 2	546,525		639,930
GNMA	Level 2	1,714,178		2,004,475
Private-label	Level 2	1,086		1,121
GNMA commercial mortgage-related securities	Level 2	1,419,872		2,028,898
Other securities (debt and equity)	Level 1	1,634		1,602
Other securities (debt and equity)	Level 2	3,173		3,000
Other securities (debt and equity)	Level 3	—		200
Total investment securities available for sale	Level 1	2,636		2,602
Total investment securities available for sale	Level 2	3,684,834		4,677,424
Total investment securities available for sale	Level 3	—		200
Residential loans held for sale (a)	Level 2	41,620		—
Interest rate-related instruments	Level 2	28,105		33,671
Foreign currency exchange forwards	Level 2	1,480		2,002
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	2,680		206
Forward commitments to sell residential mortgage loans	Level 3	159		2,908
Commodity contracts	Level 2	18,991		16,725
Purchased options (time deposit)	Level 2	1,531		2,576
Liabilities:
Interest rate-related instruments	Level 2	$	27,691	$	33,188
Foreign currency exchange forwards	Level 2	1,412		1,943
Commodity contracts	Level 2	18,040		15,972
Written options (time deposit)	Level 2	1,531		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.

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The table below presents a rollforward of the balance sheet amounts for the six months ended June 30, 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	—			(275		)
Transfer out of level 3 securities(a)	(200		)	—
Balance June 30, 2017	$	—		$	2,839

(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 June 30, 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 June 30, 2017, the closing ratio was 88%.

Derivative financial instruments (mortgage derivative—forward commitments to sell mortgage loans): Mortgage derivatives include forward commitments to 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.

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For Level 3, assets and liabilities measured at fair value on a nonrecurring basis as of June 30, 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. See Note 7 for additional information regarding the Corporation’s impaired loans.

Mortgage servicing rights: Mortgage servicing rights do not trade in an active, open market with readily observable prices. While sales of mortgage servicing rights do occur, the precise terms and conditions typically are not readily available to allow for a “quoted price for similar assets” comparison. Accordingly, the Corporation utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its mortgage servicing rights. The valuation model incorporates prepayment assumptions to project mortgage servicing rights cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the mortgage servicing rights. The valuation model considers portfolio characteristics of the underlying mortgages, contractually specified servicing fees, prepayment assumptions, discount rate assumptions, delinquency rates, late charges, other ancillary revenue, costs to service, and other economic factors. The Corporation periodically reviews and assesses the underlying inputs and assumptions used in the model. In addition, the Corporation compares its fair value estimates and assumptions to observable market data for mortgage servicing rights, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, mortgage servicing rights are classified within Level 3 of the fair value hierarchy. The Corporation uses the amortization method (i.e., lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, for its mortgage servicing rights assets.

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. 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.

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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
June 30, 2017
Assets:
Commercial loans held for sale (a)	Level 2	$	4,772	Provision for credit losses	$	—
Impaired loans (c)	Level 3	74,937		Provision for credit losses (d)	(16,462		)
Other real estate owned	Level 2	1,999		Foreclosure / OREO expense, net	(621		)
Mortgage servicing rights	Level 3	64,627		Mortgage banking, net	(275		)
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 (d)	(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 June 30, 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.

(c) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

(d) Represents provision for credit losses on individually evaluated impaired loans.

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.

The Corporations's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to mortgage servicing rights and impaired loans. The table below presents information about these inputs and further discussion is found above.

	Valuation Technique	Significant Unobservable Input	Weighted Average Input Applied
June 30, 2017
Mortgage servicing rights	Discounted cash flow	Discount rate	11%
Mortgage servicing rights	Discounted cash flow	Constant prepayment rate	11%
Impaired Loans	Appraisals / Discounted cash flow	Collateral / Discount factor	20%

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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.

		June 30, 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	$	396,677	$	396,677	$	446,558	$	446,558
Interest-bearing deposits in other financial institutions	Level 1	126,232		126,232		149,175		149,175
Federal funds sold and securities purchased under agreements to resell	Level 1	43,000		43,000		46,500		46,500
Investment securities held to maturity	Level 2	2,255,395		2,263,322		1,273,536		1,264,674
Investment securities available for sale	Level 1	2,636		2,636		2,602		2,602
Investment securities available for sale	Level 2	3,684,834		3,684,834		4,677,424		4,677,424
Investment securities available for sale	Level 3	—		—		200		200
FHLB and Federal Reserve Bank stocks	Level 2	181,180		181,180		140,001		140,001
Commercial loans held for sale	Level 2	4,772		4,772		12,474		12,474
Residential loans held for sale	Level 2	41,620		41,620		108,010		108,010
Loans, net	Level 3	20,501,968		20,377,586		19,776,381		19,680,317
Bank owned life insurance	Level 2	588,440		588,440		585,290		585,290
Derivatives (trading and other assets)	Level 2	50,107		50,107		54,974		54,974
Derivatives (trading and other assets)	Level 3	2,839		2,839		3,114		3,114
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	19,677,850	$	19,677,850	$	20,282,321	$	20,282,321
Brokered CDs and other time deposits	Level 2	1,940,330		1,940,330		1,606,127		1,606,127
Short-term funding	Level 2	1,402,482		1,402,482		1,092,035		1,092,035
Long-term funding	Level 2	3,262,120		3,288,139		2,761,795		2,791,841
Standby letters of credit (a)	Level 2	2,394		2,394		2,566		2,566
Derivatives (trading and other liabilities)	Level 2	48,674		48,674		53,679		53,679

(a) The commitment on standby letters of credit was $242 million and $260 million at June 30, 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 FHLB stocks given their “restricted” nature (i.e., the stock can only be sold back to the respective institutions (FHLB 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,

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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 and six months ended June 30, 2017 and 2016 were as follows.

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	1,782		$	1,725		$	3,563		$	3,450
Interest cost	1,756			1,780			3,512			3,560
Expected return on plan assets	(4,882		)	(5,065		)	(9,763		)	(10,130		)
Amortization of prior service cost	(18		)	12			(37		)	25
Amortization of actuarial loss	487			483			975			965
Total net pension cost	$	(875	)	$	(1,065	)	$	(1,750	)	$	(2,130	)
Postretirement Plan:
Interest cost	$	24		$	36		$	48		$	72
Amortization of prior service cost	(19		)	—			(38		)	—
Total net periodic benefit cost	$	5		$	36		$	10		$	72

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).

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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
Six Months Ended June 30, 2017
Net interest income	$	179,259		$	179,059		$	5,775		$	364,093
Noninterest income	24,490			130,679			7,072			162,241
Total revenue	203,749			309,738			12,847			526,334
Credit provision*	23,050			10,271			(12,321		)	21,000
Noninterest expense	76,897			241,339			31,771			350,007
Income (loss) before income taxes	103,802			58,128			(6,603		)	155,327
Income tax expense (benefit)	34,012			20,345			(13,283		)	41,074
Net income	$	69,790		$	37,783		$	6,680		$	114,253
Return on average allocated capital (ROCET1)**	12.6		%	13.1		%	1.1		%	10.6		%
Six Months Ended June 30, 2016
Net interest income	$	159,233		$	170,574		$	18,897		$	348,704
Noninterest income	22,549			128,880			13,931			165,360
Total revenue	181,782			299,454			32,828			514,064
Credit provision*	27,853			12,388			(6,241		)	34,000
Noninterest expense	71,543			243,260			33,528			348,331
Income (loss) before income taxes	82,386			43,806			5,541			131,733
Income tax expense (benefit)	27,716			15,332			(2,940		)	40,108
Net income	$	54,670		$	28,474		$	8,481		$	91,625
Return on average allocated capital (ROCET1)**	10.5		%	9.1		%	3.7		%	9.2		%

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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
Average balances for YTD June 2017
Average earning assets	$	10,807,106	$	9,321,564	$	6,414,384	$	26,543,054
Average loans	10,797,831		9,319,719		181,049		20,298,599
Average deposits	6,433,870		11,456,200		3,604,524		21,494,594
Average allocated capital (CET1)**	$	1,120,082	$	582,706	$	378,104	$	2,080,892
Average balances for YTD June 2016
Average earning assets	$	9,924,378	$	9,222,677	$	6,473,156	$	25,620,211
Average loans	9,913,591		9,221,370		147,447		19,282,408
Average deposits	5,744,533		11,215,704		3,471,729		20,431,966
Average allocated capital (CET1)**	$	1,049,431	$	630,520	$	224,910	$	1,904,861
* 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.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended June 30, 2017
Net interest income	$	89,871		$	90,131		$	3,817		$	183,819
Noninterest income	12,497			65,809			4,104			82,410
Total revenue	102,368			155,940			7,921			266,229
Credit provision*	11,470			5,764			(5,234		)	12,000
Noninterest expense	39,418			125,242			11,656			176,316
Income (loss) before income taxes	51,480			24,934			1,499			77,913
Income tax expense (benefit)	16,363			8,727			(5,160		)	19,930
Net income	$	35,117		$	16,207		$	6,659		$	57,983
Return on average allocated capital (ROCET1)**	12.5		%	11.0		%	4.5		%	10.6		%
Three Months Ended June 30, 2016
Net interest income	$	80,069		$	84,969		$	11,679		$	176,717
Noninterest income	10,936			65,132			6,100			82,168
Total revenue	91,005			150,101			17,779			258,885
Credit provision*	15,114			6,246			(7,360		)	14,000
Noninterest expense	37,140			121,965			15,255			174,360
Income (loss) before income taxes	38,751			21,890			9,884			70,525
Income tax expense (benefit)	13,137			7,662			635			21,434
Net income	$	25,614		$	14,228		$	9,249		$	49,091
Return on average allocated capital (ROCET1)**	9.7		%	9.0		%	13.4		%	9.9		%

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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 June 30, 2017
Average earning assets	$	10,853,881	$	9,510,571	$	6,380,103	$	26,744,555
Average loans	10,841,858		9,508,683		171,449		20,521,990
Average deposits	6,447,190		11,574,028		3,501,931		21,523,149
Average allocated capital (CET1)**	$	1,125,494	$	588,880	$	385,451	$	2,099,825
Three Months Ended June 30, 2016
Average earning assets	$	10,128,726	$	9,325,036	$	6,514,287	$	25,968,049
Average loans	10,115,959		9,323,720		202,306		19,641,985
Average deposits	5,570,919		11,331,214		3,386,820		20,288,953
Average allocated capital (CET1)**	$	1,067,203	$	633,829	$	212,209	$	1,913,241
* 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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Note 16Accumulated Other Comprehensive Income (Loss)

The following table summarizes the components , changes, and reclassifications out of accumulated other comprehensive income (loss).

($ 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 income before reclassifications	3,632			—			3,632
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			900			900
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(2,575		)	—			(2,575		)
Income tax expense	(406		)	(342		)	(748		)
Net other comprehensive income during period	651			558			1,209
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)
Balance January 1, 2016	$	459		$	(33,075	)	$	(32,616	)
Other comprehensive income before reclassifications	82,743			—			82,743
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(6,214		)	—			(6,214		)
Personnel expense	—			990			990
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(3,024		)	—			(3,024		)
Income tax expense	(28,048		)	(378		)	(28,426		)
Net other comprehensive income during period	45,457			612			46,069
Balance June 30, 2016	$	45,916		$	(32,463	)	$	13,453
	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2017	$	(22,023	)	$	(34,321	)	$	(56,344	)
Other comprehensive income before reclassifications	5,744			—			5,744
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			450			450
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,548		)	—			(1,548		)
Income tax expense	(1,601		)	(171		)	(1,772		)
Net other comprehensive income during period	2,595			279			2,874
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)
Balance April 1, 2016	$	34,936		$	(32,769	)	$	2,167
Other comprehensive income before reclassifications	22,321			—			22,321
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(3,116		)	—			(3,116		)
Personnel expense	—			495			495
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,452		)	—			(1,452		)
Income tax expense	(6,773		)	(189		)	(6,962		)
Net other comprehensive income during period	10,980			306			11,286
Balance June 30, 2016	$	45,916		$	(32,463	)	$	13,453

44

Note 17 Recent Developments

On July 20, 2017, the Corporation announced the signing of a definitive merger agreement with Bank Mutual Corporation ("Bank Mutual") in an all-stock stock transaction.  Bank Mutual Corporation is a bank holding company and the parent for BankMutual, an Office of the Comptroller of the Currency ("OCC") Chartered national bank. Based in Milwaukee, with consolidated assets of approximately $2.7 billion and deposits of approximately $1.9 billion as of June 30, 2017, BankMutual was the third largest bank, by deposit market share, headquartered in Wisconsin.   

Under the terms of the agreement, shareholders of Bank Mutual will receive 0.422 shares of the Corporation's common stock for each share of Bank Mutual common stock. The transaction is  valued at approximately $482 million based on the closing stock price on the day preceding the announcement.  The transaction is expected to be completed in early 2018, subject to the customary closing conditions, regulatory approvals, and the approval of Bank Mutual's shareholders.

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.

45

Performance Summary

• Average loans of $20.3 billionincreased$1.0 billion, or 5%, from the first six months of 2016, and residential mortgage lending accounted for 73% of average loan growth. Average deposits of $21.5 billionincreased$1.1 billion, or 5%, from the first six months of 2016. 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 $364 millionincreased$15 million, or 4%, from the first six months of 2016. Net interest margin was 2.83% compared to 2.81% in the first six months of 2016. For the remainder of 2017, the Corporation expects an improving net interest margin trend.

• Provision for credit losses of $21 milliondecreased$13 million, or 38%, from the first six months of 2016. 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 $162 million was down2% from the first six months of 2016 and reflected lower investment securities gains. For the remainder of 2017, the Corporation expects improving fee-based revenues and declining mortgage banking revenue.

• Noninterest expense of $350 million was essentially flat from the second quarter of 2016. 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)	YTD Jun 2017			YTD Jun 2016			2Q17			1Q17			4Q16			3Q16			2Q16
Net income	$	114,253		$	91,625		$	57,983		$	56,270		$	54,833		$	53,816		$	49,091
Net income available to common equity	109,584			87,258			55,644			53,940			52,485			51,628			46,922
Earnings per common share - basic	0.72			0.58			0.36			0.36			0.35			0.34			0.31
Earnings per common share - diluted	0.71			0.58			0.36			0.35			0.34			0.34			0.31
Effective tax rate	26.44		%	30.45		%	25.58		%	27.31		%	30.07		%	30.52		%	30.39		%

46

Income Statement Analysis

Net Interest Income

Table 2 Net Interest Income Analysis

	Six months ended June 30,
	2017						2016
	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	$	7,260,839	$	126,187	3.50	%	$	7,297,847	$	116,380	3.21	%
Commercial real estate lending	4,982,027		92,697		3.75	%	4,561,821		79,158		3.49	%
Total commercial	12,242,866		218,884		3.60	%	11,859,668		195,538		3.31	%
Residential mortgage	6,762,319		109,404		3.24	%	6,025,102		96,130		3.19	%
Retail	1,293,414		31,497		4.88	%	1,397,638		32,984		4.73	%
Total loans	20,298,599		359,785		3.56	%	19,282,408		324,652		3.38	%
Investment securities:
Taxable	4,805,819		47,133		1.96	%	5,000,754		49,786		1.99	%
Tax-exempt(1)	1,140,889		24,897		4.36	%	1,054,731		24,057		4.56	%
Other short-term investments	297,747		3,089		2.09	%	282,318		2,385		1.70	%
Investments and other	6,244,455		75,119		2.41	%	6,337,803		76,228		2.41	%
Total earning assets	26,543,054		$	434,904	3.29	%	25,620,211		$	400,880	3.14	%
Other assets, net	2,447,719						2,450,451
Total assets	$	28,990,773					$	28,070,662
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Interest-bearing deposits:
Savings	$	1,503,678	$	389	0.05	%	$	1,406,333	$	464	0.07	%
Interest-bearing demand	4,262,047		9,716		0.46	%	3,430,571		4,176		0.24	%
Money market	9,116,719		21,150		0.47	%	9,062,514		12,753		0.28	%
Time	1,683,177		6,849		0.82	%	1,549,351		6,051		0.79	%
Total interest-bearing deposits	16,565,621		38,104		0.46	%	15,448,769		23,444		0.31	%
Federal funds purchased and securities sold under agreements to repurchase	492,425		1,339		0.55	%	617,007		674		0.22	%
Other short-term funding	763,245		2,907		0.77	%	993,704		1,360		0.28	%
Total short-term funding	1,255,670		4,246		0.68	%	1,610,711		2,034		0.25	%
Long-term funding	2,847,570		17,946		1.27	%	2,817,560		16,428		1.17	%
Total short and long-term funding	4,103,240		22,192		1.09	%	4,428,271		18,462		0.84	%
Total interest-bearing liabilities	20,668,861		$	60,296	0.59	%	19,877,040		$	41,906	0.42	%
Noninterest-bearing demand deposits	4,928,973						4,983,197
Other liabilities	248,559						230,528
Stockholders’ equity	3,144,380						2,979,897
Total liabilities and stockholders’ equity	$	28,990,773					$	28,070,662
Interest rate spread					2.70	%					2.72	%
Net free funds					0.13	%					0.09	%
Fully tax-equivalent net interest income and net interest margin			$	374,608	2.83	%			$	358,974	2.81	%
Fully tax-equivalent adjustment			10,515						10,270
Net interest income			$	364,093					$	348,704

(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.

47

Table 2 Net Interest Income Analysis Continued

	Quarter ended
	June 30, 2017						March 31, 2017						June 30, 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	$	7,321,523	$	65,507	3.59	%	$	7,199,481	$	60,680	3.42	%	$	7,474,633	$	59,088	3.18	%
Commercial real estate lending	4,964,257		47,562		3.84	%	4,999,994		45,135		3.66	%	4,654,111		40,169		3.47	%
Total commercial	12,285,780		113,069		3.69	%	12,199,475		105,815		3.52	%	12,128,744		99,257		3.29	%
Residential mortgage	6,957,865		56,097		3.23	%	6,564,600		53,306		3.25	%	6,129,924		48,382		3.16	%
Retail	1,278,345		16,048		5.03	%	1,308,650		15,450		4.74	%	1,383,317		16,378		4.74	%
Total loans	20,521,990		185,214		3.62	%	20,072,725		174,571		3.51	%	19,641,985		164,017		3.35	%
Investment securities:
Taxable	4,781,488		23,658		1.98	%	4,830,421		23,475		1.94	%	4,967,437		24,270		1.95	%
Tax-exempt(1)	1,143,736		12,459		4.36	%	1,138,010		12,438		4.37	%	1,064,252		12,077		4.54	%
Other short-term investments	297,341		1,553		2.09	%	298,158		1,536		2.08	%	294,375		1,318		1.80	%
Investments and other	6,222,565		37,670		2.42	%	6,266,589		37,449		2.39	%	6,326,064		37,665		2.38	%
Total earning assets	26,744,555		$	222,884	3.34	%	26,339,314		$	212,020	3.24	%	25,968,049		$	201,682	3.12	%
Other assets, net	2,454,351						2,441,013						2,674,427
Total assets	$	29,198,906					$	28,780,327					$	28,642,476
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Interest-bearing deposits:
Savings	$	1,541,129	$	201	0.05	%	$	1,465,811	$	188	0.05	%	$	1,445,020	$	228	0.06	%
Interest-bearing demand	4,272,620		5,506		0.52	%	4,251,357		4,210		0.40	%	3,640,733		2,144		0.24	%
Money market	9,064,874		11,763		0.52	%	9,169,141		9,388		0.42	%	8,692,782		6,309		0.29	%
Time	1,752,255		3,710		0.85	%	1,613,331		3,138		0.79	%	1,540,424		2,997		0.78	%
Total interest-bearing deposits	16,630,878		21,180		0.51	%	16,499,640		16,924		0.42	%	15,318,959		11,678		0.31	%
Federal funds purchased and securities sold under agreements to repurchase	489,571		824		0.67	%	495,311		515		0.42	%	674,360		378		0.23	%
Other short-term funding	842,305		1,827		0.87	%	683,306		1,080		0.64	%	1,209,511		845		0.28	%
Total short-term funding	1,331,876		2,651		0.80	%	1,178,617		1,595		0.55	%	1,883,871		1,223		0.26	%
Long-term funding	2,932,348		9,950		1.36	%	2,761,850		7,996		1.17	%	3,052,581		6,923		0.91	%
Total short and long-term funding	4,264,224		12,601		1.18	%	3,940,467		9,591		0.98	%	4,936,452		8,146		0.66	%
Total interest-bearing liabilities	20,895,102		$	33,781	0.65	%	20,440,107		$	26,515	0.52	%	20,255,411		$	19,824	0.39	%
Noninterest-bearing demand deposits	4,892,271						4,966,082						4,969,994
Other liabilities	246,395						250,747						228,027
Stockholders’ equity	3,165,138						3,123,391						3,189,044
Total liabilities and stockholders’ equity	$	29,198,906					$	28,780,327					$	28,642,476
Interest rate spread					2.69	%					2.72	%					2.73	%
Net free funds					0.14	%					0.12	%					0.08	%
Fully tax-equivalent net interest income and net interest margin			$	189,103	2.83	%			$	185,505	2.84	%			$	181,858	2.81	%
Fully tax-equivalent adjustment			5,284						5,231						5,141
Net interest income			$	183,819					$	180,274					$	176,717

(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.

48

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 $364 million for the first six months of 2017 compared to $349 million for the first six months 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 $375 million for the first six months of 2017 was $16 million higher than the first six months of 2016.

• Average earning assets of $26.5 billion for the first six months of 2017 were $923 million, or 4%, higher than the first six months of 2016. Average loans increased $1.0 billion, or 5%, primarily due to a $737 million increase in residential mortgage loans and a $420 million increase in commercial real estate lending, partially offset by a $104 million decrease in other retail loans.

• Average interest-bearing liabilities of $20.7 billion for the first six months of 2017 were up $792 million, or 4%, versus the first six months of 2016. On average, interest-bearing deposits increased $1.1 billion and short-term funding decreased $355 million to $1.3 billion from the first six months of 2016.

• The net interest margin for the first six months of 2017 was 2.83%, compared to 2.81% for the first six months of 2016.

• For the first six months of 2017, loan yields increased 18 bp to 3.56% compared to the first six months of 2016. The yield on investment securities and other short-term investments remained flat at 2.41%.

• The cost of interest-bearing liabilities was 0.59% for the first six months of 2017, 17 bp higher than the first six months of 2016. The increase was primarily due to a 15 bp increase in the cost of average interest-bearing deposits (to 0.46%) and a 43 bp increase in the cost of short-term funding (to 0.68%), both primarily due to increases in the Federal Reserve interest rate.

• The Federal Reserve increased the targeted federal funds rate on June 14, 2017, to a range of 1.00%-1.25% from 0.75%-1.00%. 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 six months ended June 30, 2017 was $21 million, compared to $34 million for the six months endedJune 30, 2016. Net charge offs were $18 million (representing 0.18% of average loans) for the six months ended June 30, 2017, compared to $37 million (representing 0.39% of average loans) for the six months endedJune 30, 2016. The ratio of the allowance for loan losses to total loans was 1.35% for both June 30, 2017 and 2016.

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.

49

Noninterest Income

Table 3 Noninterest Income

							YTD % Change																	2Q17 Change vs
($ in Thousands)	YTD 2017			YTD 2016					2Q17			1Q17			4Q16			3Q16			2Q16			1Q17		2Q16
Trust service fees	$	24,281		$	22,956		6	%	$	12,346		$	11,935		$	12,211		$	11,700		$	11,509		3	%	7	%
Service charges on deposit accounts	32,386			32,717			(1	)%	16,030			16,356			16,447			17,445			16,444			(2	)%	(3	)%
Card-based and other nondeposit fees	26,229			24,708			6	%	13,764			12,465			12,592			12,777			12,717			10	%	8	%
Insurance commissions	42,473			43,387			(2	)%	20,853			21,620			17,977			19,431			22,005			(4	)%	(5	)%
Brokerage and annuity commissions	8,679			7,892			10	%	4,346			4,333			4,188			4,155			4,098			—	%	6	%
Subtotal ("fee-based revenue")	134,048			131,660			2	%	67,339			66,709			63,415			65,508			66,773			1	%	1	%
Mortgage banking income	14,965			16,287			(8	)%	7,692			7,273			12,058			21,903			8,300			6	%	(7	)%
Mortgage servicing rights expense	5,359			8,016			(33	)%	2,665			2,694			499			3,612			4,233			(1	)%	(37	)%
Mortgage banking, net	9,606			8,271			16	%	5,027			4,579			11,559			18,291			4,067			10	%	24	%
Capital market fees, net	7,925			7,331			8	%	4,042			3,883			7,716			7,012			3,793			4	%	7	%
Bank owned life insurance income	6,514			7,743			(16	)%	3,899			2,615			3,338			3,290			2,973			49	%	31	%
Other	4,492			3,960			13	%	2,213			2,279			2,379			2,180			1,789			(3	)%	24	%
Subtotal (“fee income”)	162,585			158,965			2	%	82,520			80,065			88,407			96,281			79,395			3	%	4	%
Asset gains (losses), net	(700		)	181			N/M		(466		)	(234		)	767			(1,034		)	(343		)	99	%	36	%
Investment securities gains (losses), net	356			6,214			(94	)%	356			—			3,115			(13		)	3,116			N/M		(89	)%
Total noninterest income	$	162,241		$	165,360		(2	)%	$	82,410		$	79,831		$	92,289		$	95,234		$	82,168		3	%	—	%
Mortgage loans originated for sale during period	$220,284			$517,838			(57	)%	$119,004			$101,280			$287,194			$466,092			$323,989			18	%	(63	)%
Mortgage loan settlements during period	$364,128			$491,980			(26	)%	$167,550			$196,578			$395,382			$655,298			$270,216			(15	)%	(38	)%
Trust assets under management, at market value	$8,997,305			$7,944,187			13	%	$8,997,305			$8,715,965			$8,301,564			$8,178,839			$7,944,187			3	%	13	%
Fee income ratio	31		%	31		%			31		%	31		%	32		%	35		%	31		%
N/M = Not Meaningful

Notable Contributions to the Change in Noninterest Income

• Fee-based revenue was $134 million, an increase of $2 million (2%) compared to the six months ended June 30, 2016. Within fee based revenue, card-based and other nondeposit fees increased $2 million.

• Net mortgage banking income for the first half of 2017 was $10 million, an increase of $1 million compared to the first half of 2016 due to a favorable change in the mortgage servicing rights valuation, reflecting higher interest rates at June 30, 2017.

• Net investment securities gains were down $6 million for the six months ended June 30, 2017, due to $6 million gain on the sales of FNMA and FHLMC securities in the six months ended June 30, 2016. During the first six months ended June 30, 2017, net securities gains were approximately $356,000.

50

Noninterest Expense

Table 4 Noninterest Expense

																								2Q17 Change vs
($ in Thousands)	YTD 2017			YTD 2016			YTD % Change		2Q17			1Q17			4Q16			3Q16			2Q16			1Q17		2Q16
Personnel expense	$	209,102		$	203,527		3	%	$	104,683		$	104,419		$	107,491		$	103,819		$	102,129		—	%	3	%
Occupancy	28,051			27,017			4	%	12,832			15,219			13,690			15,362			13,215			(16	)%	(3	)%
Equipment	10,719			10,842			(1	)%	5,234			5,485			5,328			5,319			5,396			(5	)%	(3	)%
Technology	29,893			28,714			4	%	15,473			14,420			14,413			14,173			14,450			7	%	7	%
Business development and advertising	12,987			14,802			(12	)%	7,152			5,835			6,298			5,251			6,591			23	%	9	%
Other intangible amortization	1,009			1,043			(3	)%	496			513			525			525			539			(3	)%	(8	)%
Loan expense	5,594			6,663			(16	)%	2,974			2,620			3,443			3,535			3,442			14	%	(14	)%
Legal and professional fees	9,877			9,881			—	%	5,711			4,166			5,184			4,804			4,856			37	%	18	%
Foreclosure / OREO expense	2,687			3,207			(16	)%	1,182			1,505			677			960			1,330			(21	)%	(11	)%
FDIC expense	16,000			16,500			(3	)%	8,000			8,000			9,250			9,000			8,750			—	%	(9	)%
Other expense	24,088			26,135			(8	)%	12,579			11,509			12,616			12,566			13,662			9	%	(8	)%
Total noninterest expense	$	350,007		$	348,331		—	%	$	176,316		$	173,691		$	178,915		$	175,314		$	174,360		2	%	1	%
Personnel expense to total noninterest expense	60		%	58		%			59		%	60		%	60		%	59		%	59		%
Average full-time equivalent employees	4,361			4,394					4,352			4,370			4,439			4,477			4,415

Notable Contributions to the Change in Noninterest Expense

• Personnel expense (which includes salary-related expenses and fringe benefit expenses) was $209 million for the six months ended June 30, 2017, up $6 million (3%) from the six months ended June 30, 2016. The increase was primarily due to a $4 million increase in incentive plan expense, along with $2 million increase in health insurance costs.

• Nonpersonnel noninterest expense on a combined basis were $141 million, down $4 million (3%) compared to the first half of 2016. Technology expense was up $1 million (4%) from the six months ended June 30, 2016, due to continual investment in solutions to drive operational efficiency. Business development and advertising was down $2 million from the first half of 2016 due to a shift in the Corporation's advertising strategy from television to digital advertising.

Income Taxes

The Corporation recognized income tax expense of $41 million for the six months ended June 30, 2017 compared to income tax expense of $40 million for six months ended June 30, 2016. The change in income tax expense was due primarily to an increase in pre-tax book income off-set by tax benefits from stock-based compensation booked during the first six months of 2017 and a partial release of a state tax reserve. The effective tax rate was 26.44% for the first six months of 2017, compared to an effective tax rate of 30.45% for the first six 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 June 30, 2017, total assets were $29.8 billion, up $630 million (2%) from December 31, 2016 and up $730 million (3%) from June 30, 2016.

• Loans of $20.8 billion at June 30, 2017 were up $728 million (4%) from December 31, 2016 and were up $968 million (5%) from June 30, 2016. See section "Loans" for additional information on loans.

• Investment securities were $5.9 billion at June 30, 2017, relatively unchanged from year-end 2016 and down $95 million (2%) from June 30, 2016.

• At June 30, 2017, total deposits of $21.6 billion were down $270 million (1%) from December 31, 2016 and were up $1.3 billion (7%) from June 30, 2016. See section "Deposits and Customer Funding" for additional information on deposits.

• Short and long-term funding of $4.7 billion at June 30, 2017 were up $811 million (21%) from year-end 2016 and down $758 million (14%) from June 30, 2016.

Loans

Table 5 Period End Loan Composition

	June 30, 2017				March 31, 2017				December 31, 2016				September 30, 2016				June 30, 2016
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
	($ in Thousands)
Commercial and industrial	$	6,571,000	32	%	$	6,300,646	31	%	$	6,489,014	32	%	$	6,721,557	34	%	$	6,701,986	34	%
Commercial real estate — owner occupied	845,336		4	%	878,391		4	%	897,724		5	%	892,678		4	%	921,736		5	%
Commercial and business lending	7,416,336		36	%	7,179,037		35	%	7,386,738		37	%	7,614,235		38	%	7,623,722		39	%
Commercial real estate — investor	3,329,585		16	%	3,415,355		17	%	3,574,732		18	%	3,530,370		18	%	3,495,791		18	%
Real estate construction	1,651,805		8	%	1,553,205		8	%	1,432,497		7	%	1,314,431		7	%	1,285,573		6	%
Commercial real estate lending	4,981,390		24	%	4,968,560		25	%	5,007,229		25	%	4,844,801		25	%	4,781,364		24	%
Total commercial	12,397,726		60	%	12,147,597		60	%	12,393,967		62	%	12,459,036		63	%	12,405,086		63	%
Residential mortgage	7,115,457		34	%	6,715,282		33	%	6,332,327		31	%	6,034,166		30	%	6,035,720		30	%
Home equity	897,111		4	%	911,969		5	%	934,443		5	%	951,594		5	%	968,771		5	%
Other consumer	372,775		2	%	372,835		2	%	393,979		2	%	399,209		2	%	405,709		2	%
Total consumer	8,385,343		40	%	8,000,086		40	%	7,660,749		38	%	7,384,969		37	%	7,410,200		37	%
Total loans	$	20,783,069	100	%	$	20,147,683	100	%	$	20,054,716	100	%	$	19,844,005	100	%	$	19,815,286	100	%

Consumer loans were $8.4 billion and represented 40% of total loans at June 30, 2017, an increase of $725 million (9%) from December 31, 2016 and an increase of $975 million (13%) from June 30, 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 six 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.

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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 June 30, 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 June 30, 2017, the largest industry group within the commercial and business lending category was the manufacturing sector which represented 6% of total loans and 17% of the total commercial and business lending portfolio. The next largest industry group 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 June 30, 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 June 30, 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

	June 30, 2017			March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016
	($ in Millions)
Pass	$	411		$	405		$	426		$	351		$	387
Special mention	39			8			20			47			64
Potential problem	37			78			75			171			176
Nonaccrual	114			134			147			127			129
Total Oil and gas related loans	$	601		$	625		$	668		$	696		$	756
Quarter net charge offs	$	12		$	6		$	6		$	22		$	19
Oil and gas related allowance	$	33		$	42		$	38		$	38		$	42
Oil and gas related allowance ratio	5.4		%	6.7		%	5.7		%	5.5		%	5.6		%

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 June 30, 2017, nonaccrual oil and gas related loans totaled approximately $114 million, representing 19% of the oil and gas loan portfolio, a decrease of $33 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 June 30, 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. Of the exposure in the Corporation's commercial real estate retailer portfolio, our largest tenant exposure is less than 5%, spread over five loans, to a national investment grade grocer. 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

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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

June 30, 2017	Within 1 Year (a)			1-5 Years			After 5 Years			Total			% of Total
	($ in Thousands)
Commercial and industrial	$	5,785,922		$	549,498		$	235,580		$	6,571,000		53	%
Commercial real estate — investor	2,342,608			920,458			66,519			3,329,585			27	%
Commercial real estate — owner occupied	401,051			323,533			120,752			845,336			7	%
Real estate construction	1,501,478			122,820			27,507			1,651,805			13	%
Total	$	10,031,059		$	1,916,309		$	450,358		$	12,397,726		100	%
Fixed rate	$	4,319,243		$	773,527		$	309,504		$	5,402,274		44	%
Floating or adjustable rate	5,711,816			1,142,782			140,854			6,995,452			56	%
Total	$	10,031,059		$	1,916,309		$	450,358		$	12,397,726		100	%
Percent by maturity distribution	81		%	15		%	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 $7.0 billion (56%) at June 30, 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 June 30, 2017, the residential mortgage portfolio was comprised of $2.3 billion of fixed-rate residential real estate mortgages and $4.8 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 June 30, 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. During the first half of 2017, the Corporation retained substantially all of its 30 year production through May. Beginning in June, the Corporation resumed originating for sale. 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 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. Subject to management’s analysis of the current interest rate environment, among other market factors, the Corporation may choose to retain 30 year mortgage loan production on its balance sheet.

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 June 30, 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

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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 June 30, 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	$	53,394	6	%
5 — 10 years	216,968		27	%
Over 10 years	545,185		67	%
Total home equity revolving lines of credit	$	815,547	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 $197 million and $214 million of student loans at June 30, 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, and other nonperforming assets.

Table 9 Nonperforming Assets

	June 30, 2017			March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016
	($ in Thousands)
Nonperforming assets:
Commercial and industrial	$	141,475		$	164,891		$	183,371		$	205,902		$	193,439
Commercial real estate — owner occupied	15,800			17,925			9,544			6,995			9,635
Commercial and business lending	157,275			182,816			192,915			212,897			203,074
Commercial real estate — investor	7,206			8,273			18,051			8,028			11,528
Real estate construction	1,717			1,247			844			864			957
Commercial real estate lending	8,923			9,520			18,895			8,892			12,485
Total commercial	166,198			192,336			211,810			221,789			215,559
Residential mortgage	51,975			54,183			50,236			53,475			52,300
Home equity	13,482			13,212			13,001			14,347			14,363
Other consumer	233			260			256			300			380
Total consumer	65,690			67,655			63,493			68,122			67,043
Total nonaccrual loans	231,888			259,991			275,303			289,911			282,602
Commercial real estate owned	4,825			5,599			7,176			9,758			7,473
Residential real estate owned	2,957			1,941			3,098			3,006			4,391
Bank properties real estate owned	—			—			—			1,735			1,805
Other real estate owned (“OREO”)	7,782			7,540			10,274			14,499			13,669
Other nonperforming assets	7,418			7,418			7,418			—			—
Total nonperforming assets (“NPAs”)	$	247,088		$	274,949		$	292,995		$	304,410		$	296,271
Accruing loans past due 90 days or more:
Commercial	$	248		$	258		$	236		$	254		$	248
Consumer	1,287			1,462			1,377			1,257			1,246
Total accruing loans past due 90 days or more	$	1,535		$	1,720		$	1,613		$	1,511		$	1,494
Restructured loans (accruing):
Commercial	$	50,634		$	51,274		$	53,022		$	53,410		$	57,251
Consumer	26,691			27,785			26,835			26,660			26,175
Total restructured loans (accruing)	$	77,325		$	79,059		$	79,857		$	80,070		$	83,426
Nonaccrual restructured loans (included in nonaccrual loans)	$	51,715		$	78,902		$	29,385		$	31,758		$	34,841
Ratios:
Nonaccrual loans to total loans	1.12		%	1.29		%	1.37		%	1.46		%	1.43		%
NPAs to total loans plus OREO	1.19		%	1.36		%	1.46		%	1.53		%	1.49		%
NPAs to total assets	0.83		%	0.94		%	1.01		%	1.04		%	1.02		%
Allowance for loan losses to nonaccrual loans	121.22		%	108.72		%	101.10		%	92.97		%	94.76		%

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Table 9 Nonperforming Assets (continued)

	June 30, 2017		March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016
	($ in Thousands)
Accruing loans 30-89 days past due:
Commercial and industrial	$	1,255	$	1,675	$	1,413	$	950	$	2,124
Commercial real estate — owner occupied	1,284		970		1,384		869		193
Commercial and business lending	2,539		2,645		2,797		1,819		2,317
Commercial real estate — investor	899		1,122		931		630		2,715
Real estate construction	135		431		369		402		524
Commercial real estate lending	1,034		1,553		1,300		1,032		3,239
Total commercial	3,573		4,198		4,097		2,851		5,556
Residential mortgage	9,165		7,243		8,142		6,697		7,382
Home equity	5,924		4,512		5,849		5,473		7,730
Other consumer	1,746		1,658		3,189		2,046		1,895
Total consumer	16,835		13,413		17,180		14,216		17,007
Total accruing loans 30-89 days past due	$	20,408	$	17,611	$	21,277	$	17,067	$	22,563
Potential problem loans:
Commercial and industrial	$	142,607	$	218,930	$	227,196	$	351,290	$	379,818
Commercial real estate — owner occupied	60,724		58,994		64,524		47,387		45,671
Commercial and business lending	203,331		277,924		291,720		398,677		425,489
Commercial real estate — investor	48,569		49,217		51,228		36,765		25,081
Real estate construction	8,901		10,141		2,465		1,929		2,117
Commercial real estate lending	57,470		59,358		53,693		38,694		27,198
Total commercial	260,801		337,282		345,413		437,371		452,687
Residential mortgage	1,576		2,155		5,615		3,226		3,953
Home equity	208		220		114		78		94
Total consumer	1,784		2,375		5,729		3,304		4,047
Total potential problem loans	$	262,585	$	339,657	$	351,142	$	440,675	$	456,734

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 June 30, 2017 was 1.12%, as compared to 1.37% at December 31, 2016 and 1.43% at June 30, 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 June 30, 2017 were relatively unchanged from both December 31, 2016 and June 30, 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 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.

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Other real estate owned ("OREO"): OREO decreased to $8 million at June 30, 2017, compared to $10 million at December 31, 2016 and $14 million at June 30, 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 June 30, 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 the allowance for loan 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 June 30, 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

	YTD
	2017			2016			June 30, 2017			March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016
	($ in Thousands)
Allowance for Loan Losses:
Balance at beginning of period	$	278,335		$	274,264		$	282,672		$	278,335		$	269,540		$	267,780		$	277,370
Provision for loan losses	21,000			31,000			11,000			10,000			18,000			20,000			11,000
Charge offs	(27,230		)	(45,866		)	(15,376		)	(11,854		)	(11,609		)	(28,964		)	(24,621		)
Recoveries	8,996			8,382			2,805			6,191			2,404			10,724			4,031
Net charge offs	(18,234		)	(37,484		)	(12,571		)	(5,663		)	(9,205		)	(18,240		)	(20,590		)
Balance at end of period	$	281,101		$	267,780		$	281,101		$	282,672		$	278,335		$	269,540		$	267,780
Allowance for Unfunded Commitments:
Balance at beginning of period	$	25,400		$	24,400		$	24,400		$	25,400		$	28,400		$	27,400		$	24,400
Provision for unfunded commitments	—			3,000			1,000			(1,000		)	(3,000		)	1,000			3,000
Balance at end of period	$	25,400		$	27,400		$	25,400		$	24,400		$	25,400		$	28,400		$	27,400
Allowance for credit losses(a)	$	306,501		$	295,180		$	306,501		$	307,072		$	303,735		$	297,940		$	295,180
Provision for credit losses(b)	$	21,000		$	34,000		$	12,000		$	9,000		$	15,000		$	21,000		$	14,000
Net loan (charge offs) recoveries:
Commercial and industrial	$	(15,414	)	$	(33,500	)	$	(11,046	)	$	(4,368	)	$	(6,566	)	$	(16,407	)	$	(18,564	)
Commercial real estate — owner occupied	62			(63		)	43			19			(221		)	(154		)	(20		)
Commercial and business lending	(15,352		)	(33,563		)	(11,003		)	(4,349		)	(6,787		)	(16,561		)	(18,584		)
Commercial real estate — investor	(640		)	679			(126		)	(514		)	5			(564		)	(560		)
Real estate construction	(15		)	(247		)	(26		)	11			(86		)	(22		)	(219		)
Commercial real estate lending	(655		)	432			(152		)	(503		)	(81		)	(586		)	(779		)
Total commercial	(16,007		)	(33,131		)	(11,155		)	(4,852		)	(6,868		)	(17,147		)	(19,363		)
Residential mortgage	(692		)	(1,989		)	(564		)	(128		)	(1,048		)	(540		)	(757		)
Home equity	227			(829		)	54			173			(491		)	125			317
Other consumer	(1,762		)	(1,535		)	(906		)	(856		)	(798		)	(678		)	(787		)
Total consumer	(2,227		)	(4,353		)	(1,416		)	(811		)	(2,337		)	(1,093		)	(1,227		)
Total net charge offs	$	(18,234	)	$	(37,484	)	$	(12,571	)	$	(5,663	)	$	(9,205	)	$	(18,240	)	$	(20,590	)
Ratios:
Allowance for loan losses to total loans	1.35		%	1.35		%	1.35		%	1.40		%	1.39		%	1.36		%	1.35		%
Allowance for loan losses to net charge offs (Annualized)	7.6x			3.6x			5.6x			12.3x			7.6x			3.7x			3.2x

(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) 

	YTD
(in basis points)	2017		2016		June 30, 2017		March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016
Net loan (charge offs) recoveries:
Commercial and industrial	(49	)	(106	)	(69	)	(28	)	(40	)	(98	)	(114	)
Commercial real estate — owner occupied	1		(1	)	2		1		(10	)	(7	)	(1	)
Commercial and business lending	(43	)	(92	)	(60	)	(24	)	(36	)	(87	)	(100	)
Commercial real estate — investor	(4	)	4		(2	)	(6	)	N/M		(6	)	(7	)
Real estate construction	N/M		(4	)	(1	)	N/M		(3	)	(1	)	(7	)
Commercial real estate lending	(3	)	2		(1	)	(4	)	(1	)	(5	)	(7	)
Total commercial	(26	)	(56	)	(36	)	(16	)	(22	)	(55	)	(64	)
Residential mortgage	(2	)	(7	)	(3	)	(1	)	(7	)	(3	)	(5	)
Home equity	5		(17	)	2		8		(21	)	5		13
Other consumer	(94	)	(75	)	(98	)	(90	)	(80	)	(67	)	(78	)
Total consumer	(6	)	(12	)	(7	)	(4	)	(12	)	(6	)	(7	)
Total net charge offs	(18	)	(39	)	(25	)	(11	)	(18	)	(36	)	(42	)

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

N/M = Not Meaningful

At June 30, 2017, the allowance for credit losses was $307 million, compared to $304 million at December 31, 2016 and $295 million at June 30, 2016. At June 30, 2017, the allowance for loan losses to total loans was 1.35% and covered 121% of nonaccrual loans, compared to 1.39% and 101%, respectively, at December 31, 2016 and 1.35% and 95%, respectively, at June 30, 2016. Management believes the level of allowance for loan losses to be appropriate at June 30, 2017.

Notable Contributions to the Change in Allowance for Credit Loss

• Total loans increased $728 million (4%) during the first half of 2017, including a $725 million (9%) increase in total consumer. Compared to June 30, 2016, total loans increased $968 million (5%), including a $975 million (13%) increase in total consumer and a $200 million (4%) increase in commercial real estate lending, which was partially offset by a $207 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$43 million during the first half of 2017 and decreased$51 million from June 30, 2016, primarily due to the migration of general commercial related credits and oil and gas related credits, respectively. 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$89 million from December 31, 2016 and decreased$194 million from June 30, 2016, primarily due to the migration 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$19 million from the first half of 2016, primarily due to the charge off of oil and gas 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 $33 million at June 30, 2017, compared to $38 million at December 31, 2016 and $42 million at June 30, 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)	June 30, 2017				March 31, 2017				December 31, 2016				September 30, 2016				June 30, 2016
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
Noninterest-bearing demand	$	5,038,162	23	%	$	5,338,212	25	%	$	5,392,208	25	%	$	5,337,677	24	%	$	5,039,336	25	%
Savings	1,552,820		7	%	1,530,155		7	%	1,431,494		7	%	1,441,187		7	%	1,451,801		7	%
Interest-bearing demand	3,858,739		18	%	4,736,236		22	%	4,687,656		21	%	4,548,390		21	%	3,789,138		19	%
Money market	9,228,129		43	%	8,608,523		39	%	8,770,963		40	%	8,894,357		41	%	8,448,543		42	%
Brokered CDs	131,184		1	%	54,993		—	%	52,725		—	%	44,373		—	%	46,268		—	%
Other time	1,809,146		8	%	1,559,916		7	%	1,553,402		7	%	1,481,728		7	%	1,517,764		7	%
Total deposits	$	21,618,180	100	%	$	21,828,035	100	%	$	21,888,448	100	%	$	21,747,712	100	%	$	20,292,850	100	%
Customer funding(a)	262,318				326,823				300,197				477,607				464,880
Total deposits and customer funding	$	21,880,498			$	22,154,858			$	22,188,645			$	22,225,319			$	20,757,730
Network transaction deposits(b)	$	3,220,956			$	3,417,380			$	3,895,467			$	3,730,513			$	3,141,214
Total deposits and customer funding, excluding Brokered CDs and network transaction deposits	$	18,528,358			$	18,682,485			$	18,240,453			$	18,450,433			$	17,570,248
Time deposits of more than $250,000	$	477,043			$	244,641			$	234,537			$	149,214			$	151,133
(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$270 million (1%) from December 31, 2016, and increased$1.3 billion (7%) from June 30, 2016, primarily in money market deposits.

• Non-maturity deposit accounts, comprised of savings, money market, and demand (both interest and noninterest-bearing demand) accounts accounted for 91% of our total deposits at June 30, 2017.

• Included in the above amounts were $3.2 billion of network deposits, primarily sourced from other financial institutions and intermediaries. These represented 15% of our total deposits at June 30, 2017.

• Other time deposits increased $256 million (16%) from December 31, 2016. This was primarily due to an increase to CDs issued to Public Entities effectively extending out the maturity of the deposits in anticipation of higher short term borrowing rates.

• During the second quarter, the Corporation experiences seasonal deposit outflows. Typically, this outflow is funded with short-term borrowings, FHLB advances, and / or network deposits.

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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 June 30, 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 June 30, 2017, the Bank had $2.1 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 June 30, 2017, the Bank had $2.1 billion available for discount window borrowings.

• The Parent Company has a $200 million commercial paper program, of which, $98 million was outstanding as of June 30, 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 June 30, 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 six months ended June 30, 2017, net cash provided by operating activities and financing activities was $299 million and $511 million, respectively, while investing activities used net cash of $882 million, for a net decrease in cash and cash equivalents of $72 million since year-end 2016. During the first half of 2017, assets of $29.8 billion increased $630 million compared to year-end 2016. On the funding side, deposits of $21.6 billion decreased by $270 million when compared to year-end 2016.

For the six months ended June 30, 2016, net cash provided by operating and financing activities was $105 million and $1.1 billion, respectively, while investing activities used net cash of $1.2 billion, for a net increase in cash and cash equivalents of $4 million since year-end 2015. During the first half of 2016, assets increased to $29.0 billion (up $1.3 billion or 5%) compared to year-end 2015, primarily due to $1.1 billion increase in loans. On the funding side, deposits decreased $715 million while short-term and long-term funding increased $1.1 billion and $835 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 half 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 June 30, 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 June 30, 2017		Static Forecast June 30, 2017		Dynamic Forecast December 31, 2016		Static Forecast December 31, 2016
Instantaneous Rate Change
100 bp increase in interest rates	2.1	%	1.9	%	1.4	%	1.5	%
200 bp increase in interest rates	4.0	%	3.4	%	2.7	%	2.9	%

At June 30, 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

	June 30, 2017		December 31, 2016
Instantaneous Rate Change
100 bp increase in interest rates	(3.3	)%	(2.9	)%
200 bp increase in interest rates	(7.0	)%	(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

June 30, 2017	One Year or Less		One to Three Years		Three to Five Years		Over Five Years		Total
	($ in Thousands)
Time deposits	$	1,285,501	$	495,148	$	156,413	$	3,268	$	1,940,330
Short-term funding	1,402,482		—		—		—		1,402,482
Long-term funding	365,000		1,999,285		150,000		747,835		3,262,120
Operating leases	9,711		18,780		15,469		20,940		64,900
Commitments to extend credit	4,077,097		2,755,762		1,432,240		155,598		8,420,697
Total	$	7,139,791	$	5,268,975	$	1,754,122	$	927,641	$	15,090,529

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 June 30, 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, Legal Proceedings and Regulatory Matters , 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 June 30, 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 June 30, 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

	2Q17			1Q17			4Q16			3Q16			2Q16
	($ in Thousands)
Risk-based Capital (1)
Common equity Tier 1	$	2,130,238		$	2,085,309		$	2,032,587		$	1,983,770		$	1,940,704
Tier 1 capital	2,289,831			2,244,863			2,191,798			2,142,779			2,059,661
Total capital	2,808,049			2,757,310			2,706,760			2,656,648			2,573,941
Total risk-weighted assets	21,590,134			21,128,672			21,340,951			21,264,972			21,168,161
Common equity Tier 1 capital ratio	9.87		%	9.87		%	9.52		%	9.33		%	9.17		%
Tier 1 capital ratio	10.61		%	10.62		%	10.27		%	10.08		%	9.73		%
Total capital ratio	13.01		%	13.05		%	12.68		%	12.49		%	12.16		%
Tier 1 leverage ratio	8.09		%	8.05		%	7.83		%	7.64		%	7.43		%
Selected Equity and Performance Ratios
Total stockholders’ equity / assets	10.72		%	10.80		%	10.61		%	10.62		%	10.43		%
Dividend payout ratio (2)	33.33		%	33.33		%	34.29		%	32.35		%	35.48		%

(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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Non-GAAP Measures

Table 18 Non-GAAP Measures

	YTD						Quarter Ended
	June 30, 2017			June 30, 2016			June 30, 2017			March 31, 2017			December 31, 2016			September 30, 2016			June 30, 2016
	($ in Thousands, except per share data)
Selected Equity and Performance Ratios (1) (2)
Tangible common equity / tangible assets							7.11		%	7.10		%	6.91		%	6.92		%	6.85		%
Return on average equity	7.33		%	6.18		%	7.35		%	7.31		%	7.07		%	7.03		%	6.19		%
Return on average tangible common equity	11.06		%	9.38		%	11.06		%	11.07		%	10.78		%	10.68		%	10.04		%
Return on average Common equity Tier 1	10.62		%	9.21		%	10.63		%	10.61		%	10.45		%	10.52		%	9.86		%
Return on average assets	0.79		%	0.66		%	0.80		%	0.79		%	0.75		%	0.74		%	0.69		%
Average stockholders' equity / average assets	10.85		%	10.62		%	10.84		%	10.85		%	10.67		%	10.52		%	11.13		%
Tangible Common Equity and Common Equity Tier 1 Reconciliation (1)(2)
Common equity							$	3,031,573		$	2,984,865		$	2,931,383		$	2,937,186		$	2,909,946
Goodwill and other intangible assets, net							(986,536		)	(987,032		)	(987,328		)	(987,853		)	(988,378		)
Tangible common equity							$	2,045,037		$	1,997,833		$	1,944,055		$	1,949,333		$	1,921,568
Less: Accumulated other comprehensive income / loss							53,470			56,344			54,679			1,254			(13,453		)
Less: Deferred tax assets/deferred tax liabilities, net							31,731			31,132			33,853			33,183			32,589
Common equity Tier 1							$	2,130,238		$	2,085,309		$	2,032,587		$	1,983,770		$	1,940,704
Tangible Assets Reconciliation (1)
Total assets							$	29,769,025		$	29,109,857		$	29,139,315		$	29,152,764		$	29,038,699
Goodwill and other intangible assets, net							(986,536		)	(987,032		)	(987,328		)	(987,853		)	(988,378		)
Tangible assets							$	28,782,489		$	28,122,825		$	28,151,987		$	28,164,911		$	28,050,321
Average Tangible Common Equity and Average Common Equity Tier 1 Reconciliation (1) (2)
Common equity	$	2,984,451		$	2,859,077		$	3,005,209		$	2,963,462		$	2,924,831		$	2,910,691		$	2,868,772
Goodwill and other intangible assets, net	(986,980		)	(988,913		)	(986,826		)	(987,135		)	(987,640		)	(988,171		)	(988,699		)
Tangible common equity	1,997,471			1,870,164			2,018,383			1,976,327			1,937,191			1,922,520			1,880,073
Less: Accumulated other comprehensive income / loss	52,179			2,343			50,148			54,234			27,922			(2,616		)	1,365
Less: Deferred tax assets/deferred tax liabilities, net	31,242			32,354			31,294			31,188			33,340			32,712			31,803
Average common equity Tier 1	$	2,080,892		$	1,904,861		$	2,099,825		$	2,061,749		$	1,998,453		$	1,952,616		$	1,913,241
Efficiency Ratio Reconciliation (3)
Federal Reserve efficiency ratio	66.54		%	69.18		%	66.69		%	66.39		%	65.35		%	64.40		%	69.34		%
Fully tax-equivalent adjustment	(1.30		)%	(1.36		)%	(1.30		)%	(1.30		)%	(1.25		)%	(1.21		)%	(1.36		)%
Other intangible amortization	(0.19		)%	(0.21		)%	(0.18		)%	(0.20		)%	(0.20		)%	(0.19		)%	(0.21		)%
Fully tax-equivalent efficiency ratio	65.05		%	67.61		%	65.21		%	64.89		%	63.90		%	63.00		%	67.77		%

(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 second quarter of 2017.

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Sequential Quarter Results

The Corporation reported net income of $58 million for the second quarter of 2017, compared to net income of $56 million for the first quarter of 2017. Net income available to common equity was $56 million for the second quarter of 2017 or net income of $0.36 for both basic and diluted earnings per common share. Comparatively, net income available to common equity for the first quarter of 2017, was $54 million, or net income of $0.36 for basic and $0.35 for diluted earnings per common share, respectively (see Table 1).

Fully tax-equivalent net interest income for the second quarter of 2017 was $189 million, $4 million higher from the first quarter of 2017. The Federal funds target rate increased to 1.25%, compared to 1.00% in first quarter of 2017. The net interest margin in the second quarter of 2017 was down 1 bp, to 2.83%. Average earning assets increased $405 million to $26.7 billion in the second quarter of 2017, with average loans up $449 million, while average investments and other short-term investments were down $44 million (primarily in mortgage related securities). On the funding side, average interest-bearing deposits were up $131 million while noninterest-bearing demand deposits were down $74 million. Average short and long-term funding increased $324 million (primarily short-term and long-term FHLB advances) (see Table 2).

The provision for credit losses was $12 million for the second quarter of 2017, up $3 million from the first quarter of 2017 (see Table 10). See discussion under sections, Provision for Credit Losses, Nonperforming Assets, and Allowance for Credit Losses.

Noninterest income for the second quarter of 2017 increased $3 million (3%) to $82 million versus the first quarter of 2017. Fee-based revenue increased $1 million (1%) from the first quarter of 2017, primarily due to an increase in card interchange fees. BOLI was $4 million, an increase of $1 million (49%) from the first quarter of 2017, primarily due to proceeds from BOLI policy claims during the second quarter of 2017 (see Table 3).

Noninterest expense increased $3 million (2%) to $176 million. Personnel expense was $105 million for the second quarter of 2017, relatively flat from the first quarter of 2017. Legal and professional fees were $6 million, up $2 million from the first quarter of 2017, primarily driven by higher consulting fees. Technology expense was up $1 million from the first quarter of 2017 due to continued investment in solutions to drive operational efficiency. Occupancy expense decreased $2 million, primarily due to decreased snow plowing and less rent during second quarter related to lease terminations and adjustments in the first quarter of 2017. All remaining noninterest expense categories on a combined basis were up $2 million (6%) compared to the first quarter of 2017 (see Table 4).

For the second quarter of 2017, the Corporation recognized income tax expense of $20 million, compared to income tax expense of $21 million for the first quarter of 2017. The effective tax rate was 25.58% and 27.31% for the second quarter of 2017 and the first quarter of 2017, respectively. See Income Taxes section for detailed discussion on taxes.

Comparable Quarter Results

The Corporation reported net income of $58 million for the second quarter of 2017, compared to $49 million for the second quarter of 2016. Net income available to common equity was $56 million for the second quarter of 2017, or net income of $0.36 for both basic and diluted earnings per common share, respectively. Comparatively, net income available to common equity for the second quarter of 2016, was $47 million, or net income of $0.31 for both basic and diluted earnings per common share (see Table 1).

Fully tax-equivalent net interest income for the second quarter of 2017 was $189 million, $7 million higher than the second quarter of 2016. The Federal funds target rate was 1.25% in second quarter of 2017 compared to 0.50% for second quarter of 2016. The net interest margin between the comparable quarters was up 2 bp, to 2.83% in the second quarter of 2017. Average earning assets increased $777 million to $26.7 billion in the second quarter of 2017, with average loans up $880 million (predominantly due to increases in residential mortgage loans). On the funding side, average interest-bearing deposits increased $1.3 billion, while noninterest-bearing demand deposits decreased $78 million from the second quarter of 2016. Average short and long-term funding decreased $672 million (primarily short-term FHLB advances) (see Table 2).

The provision for credit losses was $12 million for the second quarter of 2017, down $2 million from the second 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 second quarter of 2017 remained relatively flat at $82 million compared to second quarter of 2016. Investment securities gains decreased $3 million due to gains on sales of FNMA and FHLMC mortgage-related securities in the second quarter of 2016. Net mortgage banking income increased $1 million, predominantly due to a favorable change in the mortgage servicing rights valuation. Fee-based revenue increased $1 million primarily in card-based and other nondeposit fees (see Table 3).

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On a comparable quarter basis, noninterest expense increased $2 million (1%) to $176 million for the second quarter of 2017. Personnel expense was $105 million for the second quarter of 2017, up $3 million (3%) from the second quarter of 2016 primarily driven by increases in health insurance costs. Technology expense increased $1 million (7%) due to continued investment in solutions to drive operational efficiency. All remaining noninterest expense categories on a combined were down $2 million (3%) compared to second quarter of 2016 (see Table 4).

The Corporation recognized income tax expense of $20 million for the second quarter of 2017, compared to income tax expense of $21 million for second quarter of 2016. The effective tax rate was 25.58% and 30.39% for the second quarter of 2017 and 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.

Year to Date Segment Review

The Corporate and Commercial Specialty segment consists of lending and deposit solutions to larger businesses, developers, not-for-profits, municipalities, and financial institutions, and the support to deliver, fund, and manage such banking solutions. The Corporate and Commercial Specialty segment had net income of $70 million for the first six months of 2017, up$15 million compared to $55 million for the first six months of 2016. Segment revenue increased$22 million to $204 million for the first six months of 2017 compared to $182 million for the first six months of 2016, primarily due to growth in average loan balances and interest rate increases at the end of 2016 and in 2017. The credit provision decreased$5 million to $23 million during the first six months of 2017 due to the migration of general commercial related credits and oil and gas related credits. Average loan balances were $10.8 billion for the first six months of 2017, up$884 million from the first six months of 2016. Average deposit balances were $6.4 billion for the first six months of 2017, up$689 million from the first six months of 2016. Average allocated capital increased$71 million to $1.1 billion for the first six months of 2017 reflecting the increase in the segment’s loan balances.

The Community, Consumer, and Business segment consists of lending and deposit solutions to individuals and small to mid-sized businesses and also provides a variety of investment and fiduciary products and services. The Community, Consumer, and Business segment had net income of $38 million for the first six months of 2017, up$9 million from the first six months of 2016. Segment revenue increased$10 million to $310 million for the first six months of 2017, primarily due to growth in average loan balances and interest rate increases. Noninterest expense decreased$2 million to $241 million for the first six months of 2017, primarily due to a $1 million decrease in legal and professional fees. Average loan balances were $9.3 billion for the first six months of 2017, up$98 million from the first six months of 2016. Average deposits were $11.5 billion for the first six months of 2017, up$240 million from the first six months of 2016. Average allocated capital decreased$48 million to $583 million for the first six months of 2017.

The Risk Management and Shared Services segment had net income of $7 million for the first six months of 2017, down$2 million compared to the first six months of 2016. Net interest income decreased$13 million. Noninterest income decreased$7 million primarily due to $6 million gain on the sales of FNMA and FHLMC securities in the six months ended June 30, 2016. During the first six months ended June 30, 2017, net securities gains were approximately $356,000. The credit provision improved $6 million. Average earning asset balances were $6.4 billion for the first six months of 2017, down$59 million from an average balance of $6.5 billion for the first six months of 2016, primarily in investment securities. Average deposits were $3.6 billion for the first six months of 2017, up$133 million from the first six months of 2016. Average allocated capital increased to $378 million for the first six months of 2017.

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Comparable Quarter Segment Review

The Corporate and Commercial Specialty segment had net income of $35 million for the second quarter of 2017, up$10 million from the comparable quarter in 2016. Segment revenue increased$11 million compared to second quarter of 2016, primarily due to growth in average loan balances and interest rate increases at the end of 2016 and in 2017. The credit provision decreased$4 million to $11 million for the second quarter of 2017, due to the migration of general commercial related credits and oil and gas related credits. Average loan balances were $10.8 billion for the second quarter of 2017, up$726 million from an average balance of $10.1 billion for second quarter of 2016. Average deposit balances were $6.4 billion for the second quarter of 2017, up$876 million from the comparable quarter of 2016. Average allocated capital increased$58 million to $1.1 billion for second quarter of 2017.

The Community, Consumer, and Business Banking segment had net income of $16 million for the second quarter of 2017, up$2 million compared to second quarter of 2016. Segment revenue increased$6 million to $156 million for the second quarter of 2017. Total noninterest expense for second quarter of 2017 was $125 million, up$3 million from the comparable quarter of 2016. Average loan balances were $9.5 billion for the second quarter of 2017, up$185 million from the comparable quarter of 2016. Average deposits were $11.6 billion for the second quarter of 2017, up$243 million from average deposits of $11.3 billion for the comparable quarter of 2016. Average allocated capital decreased approximately $45 million during for the second quarter of 2017 compared to the second quarter of 2016.

The Risk Management and Shared Services segment had revenue of $8 million in the second quarter of 2017, a decrease of $10 million from the comparable quarter of 2016. The decrease in noninterest income was primarily due to $3 million less net investment securities gains from the comparable quarter of 2016. The credit provision increased$2 million. Average deposits were $3.5 billion for second quarter of 2017, up$115 million versus the comparable quarter of 2016. Average allocated capital increased $173 million to $385 million for second 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.

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Standard	Description	Date of adoption	Effect on financial statements
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.
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.

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Standard	Description	Date of adoption	Effect on financial statements
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.
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 continues to evaluate noninterest income contracts pertaining to the guidance by analyzing contracts and current accounting practices to determine if a change is appropriate. This comprehensive review is expected to be completed in the third quarter of 2017. The Corporation's preliminary analysis suggests the adoption of this accounting standard is not expected to have a material impact on the Corporation's consolidated financial statements or accounting policies. The new standard is largely consistent with existing guidance and current practices applied by our businesses. The Corporation is also evaluating where expanded disclosures are necessary. We plan to adopt this guidance using the modified retrospective approach and are extensively into our implementation plan.

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Recent Developments

On July 20, 2017, the Corporation and Bank Mutual Corporation ("Bank Mutual") jointly announced that they had entered into a definitive merger agreement under which Bank Mutual will merge with and into the Corporation. Under the terms of the merger agreement, Bank Mutual shareholders will receive 0.422 shares of Corporation common stock for each share of Bank Mutual common stock. Subject to customary closing conditions, including regulatory approvals and approval by the Bank Mutual shareholders, the transaction is expected to close in the first quarter of 2018.

On July 25, 2017, the Corporation's Board of Directors declared a regular quarterly cash dividend of $0.12 per common share, payable on September 15, 2017 to shareholders of record at the close of business on September 1, 2017. The Board of Directors also declared a regular quarterly cash dividend of $0.3828125 per depositary share on the Corporation's 6.125% Series C Perpetual Preferred Stock, payable on September 15, 2017 to shareholders of record at the close of business on September 1, 2017. The Board of Directors also declared a regular quarterly cash dividend of $0.3359375 per depositary share on the Corporation's 5.375% Series D Perpetual Preferred Stock, payable on September 15, 2017 to shareholders of record at the close of business on September 1, 2017. The Board also authorized the repurchase of up to $15 million of the Corporation's 5.375% Series D Perpetual Preferred Stock. Repurchases under such programs are subject to regulatory approval and may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs or similar facilities.

During July 2017, the Corporation repurchased approximately 1 million shares of common stock in open market purchases at an average purchase price of $23.56 per share. After these common stock repurchases, the Corporation has approximately $63 million remaining under repurchase authorizations previously approved by the Board of Directors.

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 June 30, 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 June 30, 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.

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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, Legal Proceedings and Regulatory Matters .

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

Other than 28,130 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 second 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 June 30, 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 June 30, 2017. See Recent Developments for repurchase information subsequent to June 30, 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 (10.1), Form of 2013 Incentive Compensation Plan Restricted Stock Unit Agreement.

Exhibit (10.2), Form of Amendment to 2013 Incentive Compensation Plan Restricted Stock Unit Agreement.

Exhibit (11), Statement regarding computation of per share earnings. The information required by this item is set forth in Part 1, Item 1 under Note 4 Earnings Per Common Share.

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.

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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: July 28, 2017	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer
Date: July 28, 2017	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer
Date: July 28, 2017	/s/ Tammy C. Stadler
	Tammy C. Stadler
	Principal Accounting Officer

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EX-10.1

Exhibit 10.1

ASSOCIATED BANC-CORP
2013 INCENTIVE COMPENSATION PLAN
RESTRICTED STOCK UNIT AGREEMENT

In accordance with and subject to the terms of the Associated Banc-Corp 2013 Incentive Compensation Plan (the “Plan”) and this Agreement, the Committee granted to the person named as grantee (the “Grantee”) on the cover page delivered simultaneously with this Restricted Stock Unit Agreement (the “Cover Page”) an award of Restricted Stock Units (the Cover Page and this Restricted Stock Unit Agreement hereinafter referred to as this “Agreement”).

To evidence such award and to set forth its terms, Associated Banc-Corp (the “Company”) and the Grantee agree as follows.

All capitalized terms not otherwise defined in this Agreement shall have the meaning set forth in the Plan.

1.Grant of Restricted Stock Units. Subject to, and upon the terms and conditions set forth in this Agreement and the Plan, the Committee granted to the Grantee the number of restricted stock units set forth on the Cover Page (the “RSUs”), effective as of the grant date set forth on the Cover Page (the “Grant Date”), and the Grantee hereby accepts the grant of the RSUs, as set forth herein.

2.Crediting of RSUs. The RSUs shall be credited to an account on the Company’s books as of the Grant Date. Such account shall be maintained for recordkeeping purposes only, and the Company is not obligated to segregate or set aside assets representing the amounts credited to such account. The obligation to settle such account shall be an unfunded, unsecured obligation of the Company.

3.Dividend Equivalents. Whenever dividends are paid or distributions made with respect to Shares, Dividend Equivalents shall be credited to the Grantee’s RSU Account on all Restricted Stock Units credited thereto as of the record date for such dividend or distribution. Such Dividend Equivalents shall be credited to the RSU Account in the form of additional Restricted Stock Units in a number determined by dividing the aggregate value of such Dividend Equivalents by the Fair Market Value of a Share at the payment date of such dividend or distribution. Additional RSUs received by the Grantee pursuant to this Paragraph 3 shall be subject to the terms of this Agreement, including the vesting and settlement provisions of Paragraphs 5 and 8 below.

4.Limitations on Transferability. At any time prior to vesting in accordance with Paragraph 5, 6 or 7 below, the RSUs cannot be directly or indirectly transferred, sold, assigned, encumbered or otherwise disposed.

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5.Date of Vesting. Subject to the provisions of Paragraphs 6 and 7 below, the RSUs shall become vested in accordance with the following schedule:

Vesting Date	Percentage of Restricted Stock Units To Vest
[Insert Date]	25%
[Insert Date]	25%
[Insert Date]	25%
[Insert Date]	25%

Notwithstanding the foregoing, and subject to Paragraphs 6 and 7 below, in the event that the Grantee incurs a Termination of Service prior to the Vesting Date, any RSUs that were unvested on the date of such Termination of Service shall be immediately forfeited to the Company.

In addition, in the event that the Grantee has satisfied the requisite age and years of service criteria for Early Retirement or Normal Retirement prior to any of the Vesting Dates set forth herein but the Grantee has not incurred a Termination of Service, the Vesting Date for a portion of the RSUs shall be December 15 of the same year during which the Grantee meets the applicable age and years of service requirements, such portion limited to the amount necessary to satisfy the employment tax withholding obligations as set forth in Paragraph 27.

6.Termination of Service. Subject to Paragraph 7 below, the provisions of this Paragraph 6 shall apply in the event the Grantee incurs a Termination of Service at any time prior to all the RSUs vesting pursuant to Paragraph 5 above:

(a)If the Grantee incurs a Termination of Service because of his or her death or Disability or due to Early Retirement or Normal Retirement, any RSUs that had not vested prior to the date of such Termination of Service shall vest upon the date of Termination of Service.

(b)If the Grantee incurs a Termination of Service for any reason other than his or her death, Disability, Early Retirement or Normal Retirement, then any RSUs that had not vested prior to the date of such Termination of Service shall be immediately forfeited to the Company.

7.Change in Control. Notwithstanding Paragraph 6 above, if the Grantee incurs an involuntary Termination of Service (other than due to Cause) (a) during the two year period immediately following a Change in Control that occurred after the Grant Date, and (b) before the Vesting Date, any RSUs that had not vested prior to the date of such Termination of Service shall vest. In addition, upon a Change in Control, the Grantee will have such rights with respect to the RSUs as are provided for in the Plan.

8.Settlement of RSUs. A vested RSU shall be settled as soon as administratively practicable after it vests, but in no event later than thirty (30) days after the date it vests. Each vested RSU shall be settled by ascribing to the Grantee (or, in the event of the Grantee’s death, to

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his or her Beneficiary) a Share in a book entry on the records kept by the Company’s transfer agent or such other method of delivering Shares subject to this Award, as determined appropriate by the Committee. Notwithstanding the foregoing, in the event a Grantee’s Termination of Service is due to Early Retirement or Normal Retirement, if the Grantee is a “specified employee” (within the meaning of Treasury Regulations Section 1.409A‑1(i)) and the RSU is Deferred Compensation, then the vested RSUs (other than any portion that will vest sooner to settle employment tax obligations in accordance with Section 5 above) shall be settled as soon as administratively practicable after the date that is six (6) months after the date of such Termination of Service (or earlier, such Grantee’s death).

9.Restrictive Covenants.

(a)Trade Secrets. The parties hereto acknowledge that the Company has taken and will continue to take actions to protect that information which qualifies as a trade secret under applicable law (a “Trade Secret”). Accordingly, the Grantee agrees that during the term of Grantee’s employment with the Company, and thereafter for so long as such information remains a Trade Secret, Grantee shall not directly or indirectly use or disclose any Trade Secret of the Company. With respect to the disclosure of a Trade Secret and in accordance with 18 U.S.C. § 1833, Grantee shall not be held criminally or civilly liable under any federal or state trade secret law for the disclosure of a Trade Secret that (i) is made in confidence to a federal, state, or local government official, either directly or indirectly, or to an attorney, provided that, the information is disclosed solely for the purpose of reporting or investigating a suspected violation of law; or (ii) is made in a complaint or other document filed in a lawsuit or other proceeding filed under seal so that it is not disclosed to the public. Grantee is further notified that if Grantee files a lawsuit for retaliation by the Company for reporting a suspected violation of law, Grantee may disclose the Company’s Trade Secrets to Grantee’s attorney and use the Trade Secret information in the court proceeding, provided that, Grantee files any document containing the Trade Secret under seal so that it is not disclosed to the public, and does not disclose the Trade Secret, except pursuant to court order.

(b)Confidential Information. The parties hereto acknowledge that the Company has created and maintains at great expense strategic plans, sales data and sales strategy, methods, products, procedures, processes, techniques, financial information, customer and supplier lists, personal customer data, pricing policies, personnel data and other similar confidential and proprietary information, and has received from its customers certain non-Trade Secret confidential and proprietary information (collectively, the “Confidential Information”). The parties hereto further acknowledge that the Company has taken and will continue to take actions to protect the Confidential Information. Accordingly, the Grantee agrees that during the term of the Grantee’s employment with the Company, and until the sooner of (i) such time as the Confidential Information becomes generally available to the public through no fault of the Grantee or other person under the duty of confidentiality to the Company, (ii) such time as the Confidential Information no longer provides a benefit to the Company, or (iii) two (2) years after the termination of the Grantee’s employment with the Company, the Grantee will not, in any capacity, use or disclose, or cause to be used

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or disclosed, any Confidential Information the Grantee acquired while employed by the Company. The requirements of confidentiality and the limitations on use and disclosure described in this Agreement shall not apply to Confidential Information that the Grantee can demonstrate by clear and convincing evidence, at the time of disclosure by the Company to the Grantee, was known to the Grantee as evidenced by the Grantee's contemporaneous written records.

(c)Preservation of Rights. The parties hereto agree that nothing in this Agreement shall be construed to limit or negate the law of torts or trade secrets where it provides the Company with broader protection than that provided herein.

(d)Return of Company Property. The parties hereto acknowledge that any material (in computerized or written form) that the Grantee obtained in the course of performing the Grantee’s employment duties are the sole and exclusive property of the Company, the Grantee agrees to immediately return any and all records, files, computerized data, documents, confidential or proprietary information, or any other property owned or belonging to the Company in the Grantee’s possession or under his or her control, without any originals or copies being kept by the Grantee or conveyed to any other person, upon the Grantee’s separation from employment or upon the Company’s request.

(e)Non-Interference with Customers. For a period of twelve (12) months following the termination of the Grantee’s employment with the Company for any reason, the Grantee will not, directly or indirectly, on behalf of him/herself or any other person, entity or enterprise, do any of the following:

(i)solicit or accept business from any person or entity who is an Active Customer (as defined below) of the Company, a Subsidiary, or any of their affiliates, with whom the Grantee has had business contact during the twelve (12) month period prior to the termination of the Grantee’s employment with the Company (the “Reference Period”) for the purpose of providing competitive products or services similar to those provided by the Grantee during the Reference Period; or

(ii)request or advise any of the Active Customers, suppliers or other business contacts of the Company who have business relationships with the Company and with whom the Grantee had business contact during his or her employment with the Company to withdraw, curtail or cancel any of their business relations with the Company.

“Active Customer” shall mean any customer or prospective customer of the Company which, within the Reference Period, either received any products or services supplied by or on behalf of the Company or was the recipient of at least two (2) business contacts by any personnel of the Company (including the Grantee).

(f)Non-Interference with Company Employees. For a period of twelve (12) months following the termination of the Grantee’s employment with the Company for any

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reason, the Grantee will not, directly or indirectly, on behalf of him/herself or any other person, entity or enterprise, do any of the following:

(i)directly or indirectly solicit any Restricted Person (as defined below) to provide services to any person or entity in a manner reasonably likely to pose a competitive threat to the Company; or

(ii)directly or indirectly solicit any Restricted Person to provide services to any person or entity in a manner reasonably likely to have a material negative effect on the Company’s business.

    “Restricted Person” shall mean any Company employee who (1) has been entrusted with the Company’s Confidential Information or Trade Secrets in connection with his/her employment with the Company and (2) with whom Grantee directly worked at any point during the twelve (12) month period immediately preceding the end, for whatever reason, of Grantee’s employment with the Company.

(g)Remedies. Notwithstanding any other provision of this Agreement, if the Grantee breaches any provision of this Paragraph 9, any RSUs shall be immediately forfeited to the Company. In addition, the Company shall be entitled to injunctive and other equitable relief (without the necessity of showing actual monetary damages or of posting any bond or other security): (i) restraining and enjoining any act which would constitute a breach, or (ii) compelling the performance of any obligation which, if not performed, would constitute a breach, as well as any other remedies available to the Company, including monetary damages. Upon the Company’s request, the Grantee shall provide reasonable assurances and evidence of compliance with the restrictive covenants set forth in this Paragraph 9. If any court of competent jurisdiction shall deem any provision in this Paragraph 9 too restrictive, the other provisions shall stand, and the court shall modify the unduly restrictive provision to the point of greatest restriction permissible by law. The restrictive covenants set forth in this Paragraph 9 shall survive the termination of this Agreement, the forfeiture of any RSUs, and the Grantee’s termination of employment for any reason, and the Grantee shall continue to be bound by the terms of this Paragraph 9 as if this Agreement was still in effect.

10.Liability of Company. The inability of the Company to obtain approval from any regulatory body having authority deemed by the Company to be necessary to the lawful issuance and transfer of any Shares pursuant to this Agreement shall relieve the Company of any liability with respect to the non-issuance or transfer of the Shares as to which such approval shall not have been obtained. However, the Company shall use commercially reasonable efforts to obtain all such approvals.

11.Adjustment of Award. This Award is subject to adjustment as provided under Section 4.2 of the Plan.

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12.Plan and Agreement Amendment.

(a)No discontinuation, modification, or amendment of the Plan may, without the written consent of the Grantee, adversely affect the rights of the Grantee under this Agreement, except as otherwise provided under the Plan.

(b)This Agreement may be amended as provided under the Plan, but no such amendment shall adversely affect the Grantee’s rights under this Agreement without the Grantee’s written consent, unless otherwise permitted by the Plan.

13.Shareholder Rights. The Grantee will have no rights as a shareholder with respect to any RSU unless and until it is settled pursuant to Paragraph 8 above. As of the date that a Share is ascribed or otherwise delivered pursuant to Paragraph 8 above, the Grantee shall have rights as a shareholder in the Company with respect to such Share.

14.Employment Rights. This Agreement is not a contract of employment, and the terms of employment of the Grantee or other relationship of the Grantee with an Employer shall not be affected in any way by this Agreement except as specifically provided herein. The execution of this Agreement shall not be construed as conferring any legal rights upon the Grantee for a continuation of an employment or other relationship with an Employer, nor shall it interfere with the right of an Employer to discharge the Grantee and to treat him or her without regard to the effect which such treatment might have upon him or her as a Grantee.

15.Disclosure Rights. Except as required by applicable law, the Company (or any of its affiliates) shall not have any duty or obligation to disclose affirmatively to a record or beneficial holder of Shares or RSUs, and such holder shall have no right to be advised of, any material information regarding the Company at any time prior to, upon or in connection with receipt of Shares.

16.Governing Law. This Agreement shall be governed by the internal substantive laws, but not the choice of law rules, of the State of Wisconsin. This Agreement, subject to the terms and conditions of the Plan, represents the entire agreement between the parties with respect to this Award. The parties hereto each submit and consent to the jurisdiction of the courts in the State of Wisconsin, Brown County, in any action brought to enforce or otherwise relating to this Agreement.

17.Compliance with Laws and Regulations. Notwithstanding anything herein to the contrary:

(a)the Company shall not be obligated to credit a book entry related to the RSUs on the records of the Company’s transfer agent, unless and until the Company is advised by its counsel that such book entry is in compliance with all applicable laws, regulations of governmental authority, and the requirements of any exchange upon which Shares are traded;

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(b)the Company may require, as a condition of such a book entry, and in order to ensure compliance with such laws, regulations and requirements, that the Grantee make whatever covenants, agreements, and representations, or execute whatever documents or instruments, the Company, in its sole discretion, considers necessary or desirable;

(c)no payment or benefit under this Agreement shall be provided to the Grantee if it would violate any applicable Compensation Limitation; and

(d)notwithstanding anything to the contrary in this Agreement, the RSUs (including any proceeds, gains, or other economic benefit actually or constructively received by the Grantee thereof upon the receipt, vesting, or settlement thereof, or resale of the Shares received pursuant hereto upon or after settlement of this Award) shall be subject to the provisions of any clawback or recoupment policy adopted by the Board and/or the Committee, including any such policy adopted to comply with the Dodd-Frank Wall Street Reform and Consumer Protection Act, any rules or regulations promulgated and in effect thereunder, or any SEC or securities exchange rule.

18.Successors and Assigns. Except as otherwise expressly set forth in this Agreement, the provisions of this Agreement shall inure to the benefit of, and be binding upon, the succeeding administrators, heirs and legal representatives of the Grantee and the successors and assigns of the Company.

19.No Limitation on Rights of the Company. This Agreement shall not in any way affect the right of the Company to adjust, reclassify, reorganize or otherwise make changes in its capital or business structure, or to merge, consolidate, dissolve, liquidate, sell or transfer all or any part of its business or assets.

20.Notices. Any communication or notice required or permitted to be given hereunder shall be in writing, and, if to the Company, to its principal place of business, attention: Secretary, and, if to the Grantee, to the address appearing on the records of the Company. Such communication or notice shall be delivered personally or sent by certified, registered, or express mail, postage prepaid, return receipt requested, or by a reputable overnight delivery service. Any such notice shall be deemed given when received by the intended recipient.

21.Construction. Notwithstanding any other provision of this Agreement, this Agreement is made and the RSUs are granted pursuant to the Plan and are in all respects limited by and subject to the express provisions of the Plan, as amended from time to time. This Agreement does not modify or amend the terms of the Plan. To the extent any provision of this Agreement is inconsistent or in conflict with any term or provision of the Plan, the Plan shall govern. The interpretation and construction by the Committee of the Plan, this Agreement and any such rules and regulations adopted by the Committee for purposes of administering the Plan shall be final and binding upon the Grantee and all other persons.

22.Entire Agreement. This Agreement, together with the Plan, constitutes the entire obligation of the parties hereto with respect to the subject matter hereof and shall supersede any prior expressions of intent or understanding with respect to this transaction.

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23.Waiver; Cumulative Rights. The failure or delay of either party to require performance by the other party of any provision hereof shall not affect its right to require performance of such provision unless and until such performance has been waived in writing. Each and every right hereunder is cumulative and may be exercised in part or in whole from time to time.

24.Counterparts. This Agreement may be signed in two counterparts, each of which shall be an original, but both of which shall constitute but one and the same instrument.

25.Headings. The headings contained in this Agreement are for reference purposes only and shall not affect the meaning or interpretation of this Agreement.

26.Severability. If any provision of this Agreement shall for any reason be held to be invalid or unenforceable, such invalidity or unenforceability shall not affect any other provision hereof, and this Agreement shall be construed as if such invalid or unenforceable provision were omitted.

27.Tax Consequences. The Grantee acknowledges and agrees that the Grantee is responsible for all taxes and tax consequences with respect to the grant or settlement of the RSUs awarded hereunder. The Grantee further acknowledges that it is the Grantee’s responsibility to obtain any advice that the Grantee deems necessary or appropriate with respect to any and all tax matters that may exist as a result of the grant or settlement of the RSUs awarded hereunder. Notwithstanding any other provision of this Agreement, the RSUs shall not be settled unless, as provided in Section 17 of the Plan, the Grantee shall have paid to the Company, or made arrangements satisfactory to the Company regarding the payment of, any federal, state, local or foreign income or employment taxes required by law to be withheld with respect to the grant or settlement of the RSUs or the lapse of restrictions otherwise imposed by this Agreement.

28.Receipt of Plan. The Grantee acknowledges receipt of a copy of the Plan, and represents that the Grantee is familiar with the terms and provisions thereof, and hereby accepts the RSUs subject to all the terms and provisions of this Agreement and of the Plan. The Shares are granted pursuant to the terms of the Plan, the terms of which are incorporated herein by reference, and the RSUs shall in all respects be interpreted in accordance with the Plan. The Committee shall interpret and construe the Plan and this Agreement, and its interpretation and determination shall be conclusive and binding upon the parties hereto and any other person claiming an interest hereunder, with respect to any issue arising hereunder or thereunder.

29.Condition to Accept Agreement. This Agreement shall be null and void unless the Grantee accepts this Agreement via the Online Grant Agreement portal of Fidelity’s website, indicating Grantee’s acceptance of these Restricted Stock Units pursuant to the terms and conditions of this Agreement, on or before the date listed at the end of the Cover Page.

By accepting this Agreement via the Online Grant Agreement portal of Fidelity’s website, Grantee acknowledges and agrees to the terms and conditions of this Restricted Stock Agreement, Cover Page, and the Plan, including, but not limited to, the terms of the Restrictive Covenants contained in Paragraph 9 of this Agreement.

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EX-10.2

Exhibit 10.2

AMENDMENT TO RESTRICTED STOCK UNIT AGREEMENT

THIS AMENDMENT TO RESTRICTED STOCK UNIT AGREEMENT (this “Amendment”) between Associated Banc-Corp and the Grantee is effective upon the Grantee’s (as defined on the cover page delivered simultaneously with this Amendment) consent hereto.

WHEREAS, Associated Banc-Corp previously awarded the Grantee under the Associated Banc-Corp 2013 Incentive Compensation Plan (the “Plan”) an award of Restricted Stock Units on [Insert Date] (the “Grant Date”);

WHEREAS, such award of Restricted Stock Units is evidenced by and subject to the terms of that certain Restricted Stock Unit Agreement (the “Agreement”) and certain cover page delivered simultaneously therewith, both of which the Grantee accepted;

WHEREAS, the Agreement provided that dividend equivalents would be credited to Grantee’s RSU Account as additional Restricted Stock Units; and

WHEREAS, Associated Banc-Corp intended that dividend equivalents credited to Grantee be payable in cash.

NOW, THEREFORE, effective upon the Grantee’s consent to this Amendment to Restricted Stock Unit Agreement, Associated Banc-Corp and the Grantee agree that the following terms shall apply to the Restricted Stock Units awarded to Grantee on the Grant Date.

All capitalized terms not otherwise defined in this Amendment shall have the meaning set forth in the Plan.

1. Amendments.

1.1Paragraph 3 of the Agreement shall be deleted in its entirety and replaced by the following:

3. Dividend Equivalents. Prior to settlement of the RSUs pursuant to Paragraph 8 below, the Company shall establish an account (a “Dividend Equivalent Account”) on its books for Grantee. Grantee’s Dividend Equivalent Account shall be credited with Dividend Equivalents based on the dividends paid or distributions made with respect to Shares. The amount of Dividend Equivalents credited to the Dividend Equivalent Account shall be determined by multiplying (a) by (b), where (a) is the total amount of dividends or distributions (as applicable) paid on a Share between the Grant Date and the date of settlement of the RSUs, and (b) is the number of RSUs vested on the Vesting Date. The Grantee’s Dividend Equivalent Account established pursuant to this Paragraph 3 shall be subject to the terms of this Agreement, including the vesting and settlement provisions of Paragraphs 5

and 8 below. A Dividend Equivalent Account shall be maintained for recordkeeping purposes only and the Company shall not be obligated to segregate or set aside assets representing amounts credited to the Dividend Equivalent Account. The obligation to make distributions of amounts credited to the Dividend Equivalent Account shall be an unfunded, unsecured obligation of the Company.

1.2     The Agreement is hereby amended such that all vesting and forfeiture terms, payment terms, restrictions, and any other conditions that apply to RSUs prior to settlement shall apply in the same manner to Dividend Equivalents prior to settlement, in the same proportions that apply to RSUs, except that Dividend Equivalents credited to the Dividend Equivalent Account shall be settled by a cash payment to the Grantee rather than in Shares, paid to Grantee at the same time as RSUs under Section 8 of the Agreement.

    2.    Full Force and Effect. The remaining terms of the Agreement, except as specifically amended herein, shall remain in full force and effect.

3.    Condition to Accept Agreement. This Amendment shall not apply to the Agreement unless the Grantee consents to this Amendment via the Online Grant Agreement portal of Fidelity’s website, indicating Grantee’s acceptance of the terms and conditions of this Amendment. By consenting to this Amendment via the Online Grant Agreement portal of Fidelity’s website, the Grantee acknowledges and agrees to the terms and conditions of this Amendment, the cover page delivered simultaneously herewith, and the Plan.

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: July 28, 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: July 28, 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 June 30, 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

July 28, 2017

/s/ Christopher J. Del Moral-Niles

Christopher J. Del Moral-Niles

Chief Financial Officer

July 28, 2017

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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 27, 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	Jun. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
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		151,342,987

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Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks		$ 396,677	$ 446,558
Interest-bearing deposits in other financial institutions		126,232	149,175
Federal funds sold and securities purchased under agreements to resell		43,000	46,500
Investment securities held to maturity, at amortized cost		2,255,395	1,273,536
Investment securities available for sale, at fair value		3,687,470	4,680,226
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		181,180	140,001
Residential loans held for sale	[1]	41,620	108,010
Commercial loans held for sale		4,772	12,474
Loans		20,783,069	20,054,716
Allowance for loan losses		(281,101)	(278,335)
Loans, net		20,501,968	19,776,381
Premises and equipment, net		328,404	330,315
Goodwill		972,006	971,951
Mortgage servicing rights		59,395	61,476
Other intangible assets		14,530	15,377
Trading assets		48,576	52,398
Other assets		1,107,800	1,074,937
Total assets		29,769,025	29,139,315
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits		5,038,162	5,392,208
Interest-bearing deposits		16,580,018	16,496,240
Total deposits		21,618,180	21,888,448
Federal funds purchased and securities sold under agreements to repurchase		607,669	508,347
Other short-term funding		794,813	583,688
Long-term funding		3,262,120	2,761,795
Trading liabilities		47,143	51,103
Accrued expenses and other liabilities		247,598	254,622
Total liabilities		26,577,523	26,048,003
Stockholders’ equity
Preferred equity		159,929	159,929
Common stock		1,630	1,630
Surplus		1,474,301	1,459,498
Retained earnings		1,747,632	1,695,764
Accumulated other comprehensive income (loss)		(53,470)	(54,679)
Treasury stock, at cost		(138,520)	(170,830)
Total common equity		3,031,573	2,931,383
Total stockholders’ equity		3,191,502	3,091,312
Total liabilities and stockholders’ equity		$ 29,769,025	$ 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)		9,181,834	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.

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Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 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

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Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
INTEREST INCOME
Interest and fees on loans	$ 184,246	$ 163,059	$ 357,895	$ 322,715
Interest and dividends on investment securities:
Taxable	23,658	24,270	47,133	49,786
Tax exempt	8,143	7,894	16,272	15,724
Other interest	1,553	1,318	3,089	2,385
Total interest income	217,600	196,541	424,389	390,610
INTEREST EXPENSE
Interest on deposits	21,180	11,678	38,104	23,444
Interest on Federal funds purchased and securities sold under agreements to repurchase	824	378	1,339	674
Interest on other short-term funding	1,827	845	2,907	1,360
Interest on long-term funding	9,950	6,923	17,946	16,428
Total interest expense	33,781	19,824	60,296	41,906
NET INTEREST INCOME	183,819	176,717	364,093	348,704
Provision for credit losses	12,000	14,000	21,000	34,000
Net interest income after provision for credit losses	171,819	162,717	343,093	314,704
NONINTEREST INCOME
Trust service fees	12,346	11,509	24,281	22,956
Service charges on deposit accounts	16,030	16,444	32,386	32,717
Card-based and other nondeposit fees	13,764	12,717	26,229	24,708
Insurance commissions	20,853	22,005	42,473	43,387
Brokerage and annuity commissions	4,346	4,098	8,679	7,892
Mortgage banking, net	5,027	4,067	9,606	8,271
Capital market fees, net	4,042	3,793	7,925	7,331
Bank owned life insurance income	3,899	2,973	6,514	7,743
Asset gains (losses), net	(466)	(343)	(700)	181
Investment securities gains, net	356	3,116	356	6,214
Other	2,213	1,789	4,492	3,960
Total noninterest income	82,410	82,168	162,241	165,360
NONINTEREST EXPENSE
Personnel expense	104,683	102,129	209,102	203,527
Occupancy	12,832	13,215	28,051	27,017
Equipment	5,234	5,396	10,719	10,842
Technology	15,473	14,450	29,893	28,714
Business development and advertising	7,152	6,591	12,987	14,802
Other intangible amortization	496	539	1,009	1,043
Loan expense	2,974	3,442	5,594	6,663
Legal and professional fees	5,711	4,856	9,877	9,881
Foreclosure / OREO expense	1,182	1,330	2,687	3,207
FDIC expense	8,000	8,750	16,000	16,500
Other	12,579	13,662	24,088	26,135
Total noninterest expense	176,316	174,360	350,007	348,331
Income before income taxes	77,913	70,525	155,327	131,733
Income tax expense	19,930	21,434	41,074	40,108
Net income	57,983	49,091	114,253	91,625
Preferred stock dividends	2,339	2,169	4,669	4,367
Net income available to common equity	$ 55,644	$ 46,922	$ 109,584	$ 87,258
Earnings per common share:
Basic (in usd per share)	$ 0.36	$ 0.31	$ 0.72	$ 0.58
Diluted (in usd per share)	$ 0.36	$ 0.31	$ 0.71	$ 0.58
Average common shares outstanding:
Basic (in shares)	151,573	148,511	151,196	148,556
Diluted (in shares)	154,302	149,530	154,147	149,518

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 57,983	$ 49,091	$ 114,253	$ 91,625
Investment securities available for sale:
Net unrealized gains	15,218	22,321	18,370	82,743
Net unrealized loss on available for sale securities transferred to held to maturity securities	(9,474)	0	(14,738)	0
Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities	(1,548)	(1,452)	(2,575)	(3,024)
Reclassification adjustment for net gains realized in net income	0	(3,116)	0	(6,214)
Income tax expense	(1,601)	(6,773)	(406)	(28,048)
Other comprehensive income on investment securities available for sale	2,595	10,980	651	45,457
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	(37)	12	(75)	25
Amortization of actuarial losses	487	483	975	965
Income tax expense	(171)	(189)	(342)	(378)
Other comprehensive income on pension and postretirement obligations	279	306	558	612
Total other comprehensive income	2,874	11,286	1,209	46,069
Comprehensive income	$ 60,857	$ 60,377	$ 115,462	$ 137,694

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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	91,625	0	0	0	91,625	0	0
Other comprehensive income	46,069	0	0	0	0	46,069	0
Comprehensive income	137,694
Common stock issued:
Stock-based compensation plans, net	4,276	0	0	1,153	(17,478)	0	20,601
Purchase of common stock returned to authorized but unissued	(20,007)	0	(12)	(19,995)	0	0	0
Purchase of treasury stock	(4,018)	0	0	0	0	0	(4,018)
Cash dividends:
Common stock dividends ($0.22 per share in 2016 and $0.24 per share in 2017)	(33,034)	0	0	0	(33,034)	0	0
Preferred stock dividends	(4,367)	0	0	0	(4,367)	0	0
Purchase of preferred stock	(1,248)	(1,178)	0	0	(70)	0	0
Stock-based compensation expense, net	13,210	0	0	13,210	0	0	0
Tax impact of stock-based compensation	395	0	0	395	0	0	0
Ending balance at Jun. 30, 2016	3,030,147	120,201	1,630	1,453,285	1,629,915	13,453	(188,337)
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	114,253	0	0	0	114,253	0	0
Other comprehensive income	1,209	0	0	0	0	1,209	0
Comprehensive income	115,462
Common stock issued:
Stock-based compensation plans, net	20,945	0	0	1,102	(20,912)	0	40,755
Purchase of treasury stock	(8,445)	0	0	0	0	0	(8,445)
Cash dividends:
Common stock dividends ($0.22 per share in 2016 and $0.24 per share in 2017)	(36,804)	0	0	0	(36,804)	0	0
Preferred stock dividends	(4,669)	0	0	0	(4,669)	0	0
Stock-based compensation expense, net	12,667	0	0	12,667	0	0	0
Other	1,034	0	0	1,034	0	0	0
Ending balance at Jun. 30, 2017	$ 3,191,502	$ 159,929	$ 1,630	$ 1,474,301	$ 1,747,632	$ (53,470)	$ (138,520)

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Common Stock
Cash dividends:
Common stock dividends (usd per share)	$ 0.24	$ 0.22

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 57,983	$ 49,091	$ 114,253	$ 91,625
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	12,000	14,000	21,000	34,000
Depreciation and amortization			23,241	22,914
Addition to valuation allowance on mortgage servicing rights, net			275	2,120
Amortization of mortgage servicing rights			5,084	5,896
Amortization of other intangible assets	496	539	1,009	1,043
Amortization and accretion on earning assets, funding, and other, net			17,889	22,045
Tax impact of stock based compensation			4,035	395
Gain on sales of investment securities, net			(356)	(6,214)
Asset (gains) losses, net	466	343	700	(181)
(Gain) loss on mortgage banking activities, net			4,287	(7,058)
Mortgage loans originated and acquired for sale			(220,284)	(517,838)
Proceeds from sales of mortgage loans held for sale			364,128	491,980
Increase in interest receivable			(757)	(4,875)
Increase (decrease) in interest payable			2,653	(4,739)
Commercial loans held for sale
Other, net			(38,650)	(25,836)
Net cash provided by operating activities			298,507	105,277
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans			(819,198)	(1,281,291)
Purchases of:
Available for sale securities			(417,397)	(495,453)
Held to maturity securities			(70,969)	(112,226)
Federal Home Loan Bank and Federal Reserve Bank stocks			(166,869)	(67,261)
Premises, equipment, and software, net of disposals			(19,289)	(81,461)
Other assets			(6,498)	(3,073)
Proceeds from:
Sales of available for sale securities			0	359,484
Sales of held to maturity securities			16,059	0
Proceeds from Sale of Federal Home Loan Bank Stock			125,690	20,000
Prepayments, calls, and maturities of available for sale investment securities			389,251	371,440
Prepayments, calls, and maturities of held to maturity investment securities			80,976	37,172
Sales, prepayments, calls, and maturities of other assets			6,353	13,362
Net cash paid in acquisition			(217)	(685)
Net cash used in investing activities			(882,108)	(1,239,992)
CASH FLOWS FROM FINANCING ACTIVITIES
Net decrease in deposits			(270,268)	(714,815)
Proceeds from (Repayments of) Short-term Debt			310,447	1,077,141
Proceeds from (Repayments of) Long-term Debt and Capital Securities			(12)	(430,018)
Proceeds from issuance of long-term funding			500,000	1,265,000
Proceeds from issuance of common stock for stock-based compensation plans			20,945	4,276
Purchase of preferred stock			0	(1,248)
Purchase of common stock returned to authorized but unissued			0	(20,007)
Purchase of treasury stock for tax withholding			(8,445)	(4,018)
Cash dividends on common stock			(36,804)	(33,034)
Cash dividends on preferred stock			(4,669)	(4,367)
Net cash provided by financing activities			511,194	1,138,910
Net increase (decrease) in cash and cash equivalents			(72,407)	4,195
Cash and cash equivalents at beginning of period			642,233	473,685	$ 473,685
Cash and cash equivalents at end of period	569,826	477,880	569,826	477,880	$ 642,233
Supplemental disclosures of cash flow information:
Cash paid for interest			57,306	46,316
Cash paid for income taxes			27,461	27,852
Loans and bank premises transferred to other real estate owned			3,267	4,704
Capitalized mortgage servicing rights			3,278	4,149
Loans transferred into held for sale from portfolio, net			62,264	130,694
Fair value of assets acquired, including cash and cash equivalents	0	522	0	522
Fair value ascribed to goodwill and intangible assets	217	4,119	217	4,119
Fair value of liabilities assumed	$ 0	$ 1,423	$ 0	$ 1,423

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Basis of Presentation

6 Months Ended

Jun. 30, 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

6 Months Ended

Jun. 30, 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

6 Months Ended

Jun. 30, 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 for 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

6 Months Ended

Jun. 30, 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 and unvested restricted stock awards) and common stock warrants. Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
	(In thousands, except per share data)
Net income	$	57,983		$	49,091		$	114,253		$	91,625
Preferred stock dividends	(2,339		)	(2,169		)	(4,669		)	(4,367		)
Net income available to common equity	$	55,644		$	46,922		$	109,584		$	87,258
Common shareholder dividends	(18,326		)	(16,443		)	(36,577		)	(32,646		)
Unvested share-based payment awards	(110		)	(182		)	(227		)	(388		)
Undistributed earnings	$	37,208		$	30,297		$	72,780		$	54,224
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Undistributed earnings allocated to unvested share-based payment awards	228			334			507			575
Undistributed earnings	$	37,208		$	30,297		$	72,780		$	54,224
Basic
Distributed earnings to common shareholders	$	18,326		$	16,443		$	36,577		$	32,646
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Total common shareholders earnings, basic	$	55,306		$	46,406		$	108,850		$	86,295
Diluted
Distributed earnings to common shareholders	$	18,326		$	16,443		$	36,577		$	32,646
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Total common shareholders earnings, diluted	$	55,306		$	46,406		$	108,850		$	86,295
Weighted average common shares outstanding	151,573			148,511			151,196			148,556
Effect of dilutive common stock awards	1,958			1,019			2,155			962
Effect of dilutive common stock warrants	771			—			796			—
Diluted weighted average common shares outstanding	154,302			149,530			154,147			149,518
Basic earnings per common share	$	0.36		$	0.31		$	0.72		$	0.58
Diluted earnings per common share	$	0.36		$	0.31		$	0.71		$	0.58

Anti-dilutive common stock options of approximately 1 million and 4 million for the three months ended June 30, 2017 and 2016, respectively, and 900,000 and 4 million for the six months ended June 30, 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 and six months ended June 30, 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

6 Months Ended

Jun. 30, 2017

Retirement Benefits [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 six 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 six months ended June 30, 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	(1,217,640	)	16.27
Forfeited or expired	(447,751	)	33.58
Outstanding at June 30, 2017	5,492,010		$	18.10	6.80	$	39,339
Options Exercisable at June 30, 2017	3,120,596		$	16.53	5.47	$	27,075

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 six months ended June 30, 2017, the intrinsic value of stock options exercised was approximately $11 million. For the six months ended June 30, 2016, the intrinsic value of the stock options exercised was $1 million. The total fair value of stock options vested was $4 million and $3 million, respectively, for the six months ended June 30, 2017 and June 30, 2016. The Corporation recognized compensation expense for the vesting of stock options of $2 million for both the six months ended June 30, 2017 and June 30, 2016. Included in compensation expense for 2017 was approximately $570,000 of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At June 30, 2017, the Corporation had approximately $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 first quarter 2021.

The following table summarizes information about the Corporation’s restricted stock activity for the six months ended June 30, 2017.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	2,377,380		$	17.40
Granted	737,080		25.58
Vested	(851,381	)	17.88
Forfeited	(61,616	)	18.41
Outstanding at June 30, 2017	2,201,463		$	19.94

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 $11 million were recorded for both the six months ended June 30, 2017 and June 30, 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 $26 million of unrecognized compensation costs related to restricted stock awards at June 30, 2017, that is expected to be recognized over the remaining requisite service periods that extend predominantly through the first quarter 2021.

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

6 Months Ended

Jun. 30, 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.

June 30, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,004	$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	534,058		13,873		(1,406		)	546,525
GNMA	1,729,386		1,894		(17,102		)	1,714,178
Private-label	1,102		—		(16		)	1,086
GNMA commercial mortgage-related securities	1,443,501		74		(23,703		)	1,419,872
Other securities (debt and equity)	4,718		116		(27		)	4,807
Total investment securities available for sale	$	3,713,769	$	15,957	$	(42,256	)	$	3,687,470
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,162,920	$	13,766	$	(4,320	)	$	1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	43,575		430		(566		)	43,439
GNMA	473,517		4,048		(3,214		)	474,351
GNMA commercial mortgage-related securities	575,383		8,964		(11,181		)	573,166
Total investment securities held to maturity	$	2,255,395	$	27,208	$	(19,281	)	$	2,263,322

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 June 30, 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
	Amortized Cost		Fair Value			Amortized Cost		Fair Value
	($ in Thousands)
Due in one year or less	$	1,500	$	1,506		$	41,085	$	33,447
Due after one year through five years	4,204		4,175			239,986		246,760
Due after five years through ten years	—		—			261,149		265,255
Due after ten years	—		—			620,700		626,904
Total debt securities	5,704		5,681			1,162,920		1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	534,058		546,525			43,575		43,439
GNMA	1,729,386		1,714,178			473,517		474,351
Private-label	1,102		1,086			—		—
GNMA commercial mortgage-related securities	1,443,501		1,419,872			575,383		573,166
Equity securities	18		128			—		—
Total investment securities	$	3,713,769	$	3,687,470		$	2,255,395	$	2,263,322
Ratio of Fair Value to Amortized Cost			99.3		%			100.4		%

During the first six months of 2017, the Corporation reclassified approximately $1 billion of GNMA residential mortgage-related securities and GNMA commercial mortgage-related securities from available for sale to held to maturity. The GNMA residential and commercial mortgage-related securities are principally securities with a CRA component in the underlying collateral. 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.

The proceeds from the sale of investment securities for the first six months ended June 30, 2017 and 2016 are shown below.

	Six Months Ended June 30,
	2017			2016
	($ in Thousands)
Gross gains on available for sale securities	$	—		$	6,403
Gross gains on held to maturity securities	361			—
Total gains	361			6,403
Gross losses on available for sale securities	—			(189		)
Gross losses on held to maturity securities	$	(5	)	$	—
Total losses	$	(5	)	$	(189	)
Investment securities gains, net	$	356		$	6,214
Proceeds from sales of investment securities	$	16,059		$	359,484

During the first six months of 2017, the Corporation sold approximately $16 million of municipal securities classified as held to maturity due to credit concerns stemming from budgetary pressure and continued credit rating deterioration concerns in the State of Illinois. These sales resulted in a net gain of approximately $356,000.

Investment securities with a carrying value of approximately $2 billion and $1.8 billion at June 30, 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 June 30, 2017.

	Less than 12 months						12 months or more						Total
June 30, 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:
U.S. Treasury securities	1	$	(2	)	$	1,002	—	$	—		$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	18	(1,406		)	223,326		—	—			—		(1,406		)	223,326
GNMA	42	(16,220		)	1,186,468		1	(882		)	35,695		(17,102		)	1,222,163
Private-label	—	—			—		1	(16		)	1,084		(16		)	1,084
GNMA commercial mortgage-related securities	54	(8,627		)	850,180		31	(15,076		)	496,698		(23,703		)	1,346,878
Other securities (debt and equity)	3	(27		)	2,173		—	—			—		(27		)	2,173
Total	118	$	(26,282	)	$	2,263,149	33	$	(15,974	)	$	533,477	$	(42,256	)	$	2,796,626
Investment securities held to maturity:
Municipal securities	301	$	(4,186	)	$	222,642	9	$	(134	)	$	4,814	$	(4,320	)	$	227,456
Residential mortgage-related securities:
FNMA / FHLMC	18	(377		)	25,507		1	(189		)	5,657		(566		)	31,164
GNMA	45	(3,192		)	358,551		1	(22		)	1,246		(3,214		)	359,797
GNMA commercial mortgage-related securities	14	(3,683		)	301,594		10	(7,498		)	241,385		(11,181		)	542,979
Total	378	$	(11,438	)	$	908,294	21	$	(7,843	)	$	253,102	$	(19,281	)	$	1,161,396

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 June 30, 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 June 30, 2017, and December 31, 2016, the Corporation had FHLB stock of $106 million and $65 million, respectively. The Corporation had Federal Reserve Bank stock of $76 million and $75 million at June 30, 2017 and December 31, 2016, respectively.

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Loans

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Loans

Loans

The period end loan composition was as follows.

	June 30, 2017		December 31, 2016
	($ in Thousands)
Commercial and industrial	$	6,571,000	$	6,489,014
Commercial real estate — owner occupied	845,336		897,724
Commercial and business lending	7,416,336		7,386,738
Commercial real estate — investor	3,329,585		3,574,732
Real estate construction	1,651,805		1,432,497
Commercial real estate lending	4,981,390		5,007,229
Total commercial	12,397,726		12,393,967
Residential mortgage	7,115,457		6,332,327
Home equity	897,111		934,443
Other consumer	372,775		393,979
Total consumer	8,385,343		7,660,749
Total loans	$	20,783,069	$	20,054,716

The following table presents commercial and consumer loans by credit quality indicator at June 30, 2017.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,183,037	$	103,881	$	142,607	$	141,475	$	6,571,000
Commercial real estate - owner occupied	754,446		14,366		60,724		15,800		845,336
Commercial and business lending	6,937,483		118,247		203,331		157,275		7,416,336
Commercial real estate - investor	3,260,187		13,623		48,569		7,206		3,329,585
Real estate construction	1,621,198		19,989		8,901		1,717		1,651,805
Commercial real estate lending	4,881,385		33,612		57,470		8,923		4,981,390
Total commercial	11,818,868		151,859		260,801		166,198		12,397,726
Residential mortgage	7,060,673		1,233		1,576		51,975		7,115,457
Home equity	882,253		1,168		208		13,482		897,111
Other consumer	372,018		524		—		233		372,775
Total consumer	8,314,944		2,925		1,784		65,690		8,385,343
Total	$	20,133,812	$	154,784	$	262,585	$	231,888	$	20,783,069

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 June 30, 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	$	6,428,022	$	1,042	$	213	$	248	$	141,475	$	6,571,000
Commercial real estate - owner occupied	828,252		1,136		148		—		15,800		845,336
Commercial and business lending	7,256,274		2,178		361		248		157,275		7,416,336
Commercial real estate - investor	3,321,480		899		—		—		7,206		3,329,585
Real estate construction	1,649,953		40		95		—		1,717		1,651,805
Commercial real estate lending	4,971,433		939		95		—		8,923		4,981,390
Total commercial	12,227,707		3,117		456		248		166,198		12,397,726
Residential mortgage	7,054,317		8,163		1,002		—		51,975		7,115,457
Home equity	877,705		4,755		1,169		—		13,482		897,111
Other consumer	369,509		1,113		633		1,287		233		372,775
Total consumer	8,301,531		14,031		2,804		1,287		65,690		8,385,343
Total	$	20,529,238	$	17,148	$	3,260	$	1,535	$	231,888	$	20,783,069

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2017 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$180 million or 78% were current with respect to payment at June 30, 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 June 30, 2017.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	89,563	$	94,231	$	17,882	$	95,205	$	635
Commercial real estate — owner occupied	7,249		9,154		526		6,086		93
Commercial and business lending	96,812		103,385		18,408		101,291		728
Commercial real estate — investor	15,832		16,111		330		15,782		767
Real estate construction	1,819		2,188		707		1,868		54
Commercial real estate lending	17,651		18,299		1,037		17,650		821
Total commercial	114,463		121,684		19,445		118,941		1,549
Residential mortgage	60,209		65,163		10,649		60,831		1,112
Home equity	20,927		22,907		9,665		21,232		484
Other consumer	1,315		1,342		229		1,335		12
Total consumer	82,451		89,412		20,543		83,398		1,608
Total loans(a)	$	196,914	$	211,096	$	39,988	$	202,339	$	3,157
Loans with no related allowance
Commercial and industrial	$	83,452	$	107,471	$	—	$	104,989	$	173
Commercial real estate — owner occupied	12,696		13,546		—		12,906		49
Commercial and business lending	96,148		121,017		—		117,895		222
Commercial real estate — investor	6,002		6,466		—		6,071		—
Real estate construction	219		222		—		222		—
Commercial real estate lending	6,221		6,688		—		6,293		—
Total commercial	102,369		127,705		—		124,188		222
Residential mortgage	9,390		10,246		—		9,461		101
Home equity	540		543		—		540		—
Other consumer	—		—		—		—		—
Total consumer	9,930		10,789		—		10,001		101
Total loans(a)	$	112,299	$	138,494	$	—	$	134,189	$	323
Total
Commercial and industrial	$	173,015	$	201,702	$	17,882	$	200,194	$	808
Commercial real estate — owner occupied	19,945		22,700		526		18,992		142
Commercial and business lending	192,960		224,402		18,408		219,186		950
Commercial real estate — investor	21,834		22,577		330		21,853		767
Real estate construction	2,038		2,410		707		2,090		54
Commercial real estate lending	23,872		24,987		1,037		23,943		821
Total commercial	216,832		249,389		19,445		243,129		1,771
Residential mortgage	69,599		75,409		10,649		70,292		1,213
Home equity	21,467		23,450		9,665		21,772		484
Other consumer	1,315		1,342		229		1,335		12
Total consumer	92,381		100,201		20,543		93,399		1,709
Total loans(a)	$	309,213	$	349,590	$	39,988	$	336,528	$	3,480

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 77% of the unpaid principal balance at June 30, 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 $35 million in loans modified in troubled debt restructurings for the six months ended June 30, 2017, of which approximately $6 million was in accrual status and $29 million was in nonaccrual pending a sustained period of repayment. During the six months ended June 30, 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 June 30, 2017 and December 31, 2016. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	June 30, 2017				December 31, 2016
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	31,540	$	27,016	$	31,884	$	1,276
Commercial real estate — owner occupied	4,145		2,145		5,490		2,220
Commercial real estate — investor	14,628		602		15,289		924
Real estate construction	321		164		359		150
Residential mortgage	17,624		19,365		18,100		21,906
Home equity	7,985		2,401		7,756		2,877
Other consumer	1,082		22		979		32
Total	$	77,325	$	51,715	$	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 six months ended June 30, 2017 and 2016, respectively, and the recorded investment and unpaid principal balance as of June 30, 2017 and 2016 respectively.

	Six Months Ended June 30, 2017					Six Months Ended June 30, 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	24	$	30,935	$	52,260	11	$	2,608	$	2,676
Commercial real estate — owner occupied	2	716		716		1	120		126
Residential mortgage	36	2,695		2,805		48	3,942		4,171
Home equity	26	674		919		37	1,433		1,554
Total	88	$	35,020	$	56,700	97	$	8,103	$	8,527

(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 six months ended June 30, 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 six months ended June 30, 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 six months ended June 30, 2017 and 2016, respectively, as well as the recorded investment in these restructured loans as of June 30, 2017 and 2016, respectively.

	Six Months Ended June 30, 2017			Six Months Ended June 30, 2016
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate — owner occupied	—	$	—	2	$	168
Residential mortgage	17	941		25	2,407
Home equity	9	271		11	164
Total	26	$	1,212	38	$	2,739

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 six months ended June 30, 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	(21,912		)	(83		)	(803		)	(62		)	(1,034		)	(1,196		)	(2,140		)	(27,230		)
Recoveries	6,498			145			163			47			342			1,423			378			8,996
Net charge offs	(15,414		)	62			(640		)	(15		)	(692		)	227			(1,762		)	(18,234		)
Provision for loan losses	18,295			(5,551		)	(3,155		)	4,571			5,212			(351		)	1,979			21,000
June 30, 2017	$	143,007		$	8,545		$	41,490		$	31,488		$	31,566		$	20,240		$	4,765		$	281,101
Allowance for loan losses:
Impaired loans:
Individually evaluated	$	17,350		$	187		$	183		$	—		$	106		$	—		$	—		$	17,826
Collectively evaluated	532			339			147			707			10,543			9,665			229			22,162
Total impaired loans	17,882			526			330			707			10,649			9,665			229			39,988
Non-impaired loans:
Collectively evaluated	125,125			8,019			41,160			30,781			20,917			10,575			4,536			241,113
Total	$	143,007		$	8,545		$	41,490		$	31,488		$	31,566		$	20,240		$	4,765		$	281,101
Period end loan balances:
Impaired loans:
Individually evaluated	$	140,061		$	15,303		$	6,799		$	220		$	11,060		$	643		$	—		$	174,086
Collectively evaluated	32,954			4,642			15,035			1,818			58,539			20,824			1,315			135,127
Total impaired loans	173,015			19,945			21,834			2,038			69,599			21,467			1,315			309,213
Non-impaired loans:
Collectively evaluated	6,397,985			825,391			3,307,751			1,649,767			7,045,858			875,644			371,460			20,473,856
Total	$	6,571,000		$	845,336		$	3,329,585		$	1,651,805		$	7,115,457		$	897,111		$	372,775		$	20,783,069

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:
Impaired loans:
Individually evaluated	$	20,836		$	—		$	3,117		$	—		$	147		$	3		$	—		$	24,103
Collectively evaluated	781			295			424			441			10,944			9,309			186			22,380
Total impaired loans	21,617			295			3,541			441			11,091			9,312			186			46,483
Non-impaired loans:
Collectively evaluated	118,509			13,739			41,744			26,491			15,955			11,052			4,362			231,852
Total	$	140,126		$	14,034		$	45,285		$	26,932		$	27,046		$	20,364		$	4,548		$	278,335
Period end loan balances:
Impaired loans:
Individually evaluated	$	180,965		$	8,439		$	17,322		$	—		$	7,033		$	650		$	—		$	214,409
Collectively evaluated	34,290			6,595			16,018			1,203			61,303			20,107			1,235			140,751
Total impaired loans	215,255			15,034			33,340			1,203			68,336			20,757			1,235			355,160
Non-impaired loans:
Collectively evaluated	6,273,759			882,690			3,541,392			1,431,294			6,263,991			913,686			392,744			19,699,556
Total	$	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.

	Six Months Ended June 30, 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
Balance at end of period	$	25,400	$	25,400

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Goodwill and Other Intangible Assets

6 Months Ended

Jun. 30, 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 2017, 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 2017 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 2017 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2016 or the first six months of 2017.

At both June 30, 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	4,385
Accumulated amortization	(4,385		)	(4,273		)
Net book value	$	—		$	112
Amortization during the year	$	112		$	281
Other intangibles:
Gross carrying amount	$	32,572		$	32,410
Accumulated amortization	(18,042		)	(17,145		)
Net book value	$	14,530		$	15,265
Additions during the period	$	162		$	1,012
Amortization during the year	$	897		$	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 at minimum quarterly 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,085		$	62,150
Additions	3,278			12,262
Amortization	(5,084		)	(12,327		)
Mortgage servicing rights at end of period	$	60,279		$	62,085
Valuation allowance at beginning of period	(609		)	(809		)
(Additions) recoveries, net	(275		)	200
Valuation allowance at end of period	(884		)	(609		)
Mortgage servicing rights, net	$	59,395		$	61,476
Fair value of mortgage servicing rights	$	64,627		$	73,149
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,768,374		$	7,974,742
Mortgage servicing rights, net to servicing portfolio	0.76		%	0.77		%
Mortgage servicing rights expense (a)	$	5,359		$	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 June 30, 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	Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Six months ending December 31, 2017	$	901	$	5,046
2018	1,771		8,897
2019	1,472		7,476
2020	1,355		6,292
2021	1,331		5,315
2022	1,308		4,515
Beyond 2022	6,392		22,738
Total Estimated Amortization Expense	$	14,530	$	60,279

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Short and Long-Term Funding

6 Months Ended

Jun. 30, 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.

	June 30, 2017			December 31, 2016
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	345,350		$	208,150
Securities sold under agreements to repurchase	262,319			300,197
Federal funds purchased and securities sold under agreements to repurchase	$	607,669		$	508,347
FHLB advances	697,000			482,000
Commercial paper	97,813			101,688
Other short-term funding	794,813			583,688
Total short-term funding	$	1,402,482		$	1,092,035
Long-Term Funding
FHLB advances	$	2,765,176		$	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	(3,056		)	(3,393		)
Total long-term funding	3,262,120			2,761,795
Total short and long-term funding	$	4,664,602		$	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 June 30, 2017, the Corporation pledged agency mortgage-related securities with a fair value of $381 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 June 30, 2017 and December 31, 2016 are presented in the following table.

	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 days		30-90 days		Greater than 90 days		Total
June 30, 2017					($ in Thousands)
Repurchase agreements
Agency mortgage-related securities	$	262,319	$	—	$	—	$	—	$	262,319
Total	$	262,319	$	—	$	—	$	—	$	262,319
December 31, 2016
Repurchase agreements
Agency mortgage-related securities	$	300,197	$	—	$	—	$	—	$	300,197
Total	$	300,197	$	—	$	—	$	—	$	300,197

Long-Term Funding

FHLB advances: At June 30, 2017, the long-term FHLB advances had a weighted average interest rate of 0.98%, 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

6 Months Ended

Jun. 30, 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 $22 million of investment securities as collateral at June 30, 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 June 30, 2017 the Corporation posted $1 million cash collateral for the margin compared to none at December 31, 2016.

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.

	June 30, 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	$	2,118,409	$	28,105		Trading assets	$	2,039,323	$	33,671		Trading assets
Interest rate-related instruments — customer and mirror	2,118,409		(27,691		)	Trading liabilities	2,039,323		(33,188		)	Trading liabilities
Foreign currency exchange forwards	93,300		1,480			Trading assets	109,675		2,002			Trading assets
Foreign currency exchange forwards	92,969		(1,412		)	Trading liabilities	106,251		(1,943		)	Trading liabilities
Commodity contracts	304,554		18,991			Trading assets	127,582		16,725			Trading assets
Commodity contracts	303,790		(18,040		)	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.

	June 30, 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)	356,798	2,680		Other assets	285,345	206		Other assets
Forward commitments (mortgage)	151,500	159		Other assets	179,600	2,908		Other assets
Purchased options (time deposit)	75,899	1,531		Other assets	80,554	2,576		Other assets
Written options (time deposit)	75,899	(1,531	)	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 Six Months Ended June 30,
($ in Thousands)		2017			2016
Derivative Instruments:
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(69	)	$	(1,426	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	2,474			3,312
Forward commitments (mortgage)	Mortgage banking, net	(2,749		)	(4,608		)
Foreign currency exchange forwards	Capital market fees, net	9			(48		)
Commodity contracts	Capital market fees, net	198			358

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Balance Sheet Offsetting

6 Months Ended

Jun. 30, 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)
June 30, 2017
Derivative assets:
Interest and commodity agreements	$	24,322	$	—	$	24,322	$	(16,517	)	$	(7,805	)	$	—
Derivative liabilities:
Interest and commodity agreements	$	16,517	$	—	$	16,517	$	(16,517	)	$	—		$	—
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, Legal Proceedings and Regulatory Matters

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters

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.

	June 30, 2017		December 31, 2016
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	8,063,899	$	8,131,131
Commercial letters of credit(a)	5,839		7,923
Standby letters of credit(c)	242,144		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 June 30, 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 $2 million at June 30, 2017 and $3 million at 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 $25 million at both June 30, 2017 and 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 June 30, 2017, was $114 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 $84 million at June 30, 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.

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.

Regulatory Matters

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 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.

On March 27, 2017, the Bank received a Community Reinvestment Act ("CRA") rating from the Office of the Comptroller of the Currency of "Satisfactory" for the period from January 1, 2011 through July 27, 2015. As a result of this rating, the restrictions on certain of the Bank's activities that had been imposed under the previous "Needs to Improve" CRA rating are no longer applicable.

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 $367,000 and $2 million during the six months ended June 30, 2017 and the year ended December 31, 2016, respectively. The loss reimbursement and settlement claims paid for the six months ended June 30, 2017 and the year ended December 31, 2016, respectively were negligible. Make whole requests during 2016 and the first six months of 2017 generally arose from loans sold during the period of January 1, 2012 to June 30, 2017, which totaled $9.5 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of June 30, 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Balance at beginning of period	$	900		$	1,197
Repurchase provision expense	109			456
Adjustments to provision expense	—			(750		)
Charge offs, net	(18		)	(3		)
Balance at end of period	$	991		$	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 June 30, 2017, and December 31, 2016, there were approximately $74 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 June 30, 2017 and December 31, 2016, there were $85 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

6 Months Ended

Jun. 30, 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 June 30, 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 June 30, 2017 and December 31, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Hierarchy	June 30, 2017		December 31, 2016
		($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	Level 1	$	1,002	$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	Level 2	546,525		639,930
GNMA	Level 2	1,714,178		2,004,475
Private-label	Level 2	1,086		1,121
GNMA commercial mortgage-related securities	Level 2	1,419,872		2,028,898
Other securities (debt and equity)	Level 1	1,634		1,602
Other securities (debt and equity)	Level 2	3,173		3,000
Other securities (debt and equity)	Level 3	—		200
Total investment securities available for sale	Level 1	2,636		2,602
Total investment securities available for sale	Level 2	3,684,834		4,677,424
Total investment securities available for sale	Level 3	—		200
Residential loans held for sale (a)	Level 2	41,620		—
Interest rate-related instruments	Level 2	28,105		33,671
Foreign currency exchange forwards	Level 2	1,480		2,002
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	2,680		206
Forward commitments to sell residential mortgage loans	Level 3	159		2,908
Commodity contracts	Level 2	18,991		16,725
Purchased options (time deposit)	Level 2	1,531		2,576
Liabilities:
Interest rate-related instruments	Level 2	$	27,691	$	33,188
Foreign currency exchange forwards	Level 2	1,412		1,943
Commodity contracts	Level 2	18,040		15,972
Written options (time deposit)	Level 2	1,531		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.

The table below presents a rollforward of the balance sheet amounts for the six months ended June 30, 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	—			(275		)
Transfer out of level 3 securities(a)	(200		)	—
Balance June 30, 2017	$	—		$	2,839

(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 June 30, 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 June 30, 2017, the closing ratio was 88%.

Derivative financial instruments (mortgage derivative—forward commitments to sell mortgage loans): Mortgage derivatives include forward commitments to 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 June 30, 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. See Note 7 for additional information regarding the Corporation’s impaired loans.

Mortgage servicing rights: Mortgage servicing rights do not trade in an active, open market with readily observable prices. While sales of mortgage servicing rights do occur, the precise terms and conditions typically are not readily available to allow for a “quoted price for similar assets” comparison. Accordingly, the Corporation utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its mortgage servicing rights. The valuation model incorporates prepayment assumptions to project mortgage servicing rights cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the mortgage servicing rights. The valuation model considers portfolio characteristics of the underlying mortgages, contractually specified servicing fees, prepayment assumptions, discount rate assumptions, delinquency rates, late charges, other ancillary revenue, costs to service, and other economic factors. The Corporation periodically reviews and assesses the underlying inputs and assumptions used in the model. In addition, the Corporation compares its fair value estimates and assumptions to observable market data for mortgage servicing rights, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, mortgage servicing rights are classified within Level 3 of the fair value hierarchy. The Corporation uses the amortization method (i.e., lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, for its mortgage servicing rights assets.

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. 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
June 30, 2017
Assets:
Commercial loans held for sale (a)	Level 2	$	4,772	Provision for credit losses	$	—
Impaired loans (c)	Level 3	74,937		Provision for credit losses (d)	(16,462		)
Other real estate owned	Level 2	1,999		Foreclosure / OREO expense, net	(621		)
Mortgage servicing rights	Level 3	64,627		Mortgage banking, net	(275		)
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 (d)	(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 June 30, 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.

(c) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

(d) Represents provision for credit losses on individually evaluated impaired loans.

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.

The Corporations's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to mortgage servicing rights and impaired loans. The table below presents information about these inputs and further discussion is found above.

	Valuation Technique	Significant Unobservable Input	Weighted Average Input Applied
June 30, 2017
Mortgage servicing rights	Discounted cash flow	Discount rate	11%
Mortgage servicing rights	Discounted cash flow	Constant prepayment rate	11%
Impaired Loans	Appraisals / Discounted cash flow	Collateral / Discount factor	20%

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.

		June 30, 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	$	396,677	$	396,677	$	446,558	$	446,558
Interest-bearing deposits in other financial institutions	Level 1	126,232		126,232		149,175		149,175
Federal funds sold and securities purchased under agreements to resell	Level 1	43,000		43,000		46,500		46,500
Investment securities held to maturity	Level 2	2,255,395		2,263,322		1,273,536		1,264,674
Investment securities available for sale	Level 1	2,636		2,636		2,602		2,602
Investment securities available for sale	Level 2	3,684,834		3,684,834		4,677,424		4,677,424
Investment securities available for sale	Level 3	—		—		200		200
FHLB and Federal Reserve Bank stocks	Level 2	181,180		181,180		140,001		140,001
Commercial loans held for sale	Level 2	4,772		4,772		12,474		12,474
Residential loans held for sale	Level 2	41,620		41,620		108,010		108,010
Loans, net	Level 3	20,501,968		20,377,586		19,776,381		19,680,317
Bank owned life insurance	Level 2	588,440		588,440		585,290		585,290
Derivatives (trading and other assets)	Level 2	50,107		50,107		54,974		54,974
Derivatives (trading and other assets)	Level 3	2,839		2,839		3,114		3,114
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	19,677,850	$	19,677,850	$	20,282,321	$	20,282,321
Brokered CDs and other time deposits	Level 2	1,940,330		1,940,330		1,606,127		1,606,127
Short-term funding	Level 2	1,402,482		1,402,482		1,092,035		1,092,035
Long-term funding	Level 2	3,262,120		3,288,139		2,761,795		2,791,841
Standby letters of credit (a)	Level 2	2,394		2,394		2,566		2,566
Derivatives (trading and other liabilities)	Level 2	48,674		48,674		53,679		53,679

(a) The commitment on standby letters of credit was $242 million and $260 million at June 30, 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 FHLB stocks given their “restricted” nature (i.e., the stock can only be sold back to the respective institutions (FHLB 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

6 Months Ended

Jun. 30, 2017

Defined Benefit Plan [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 and six months ended June 30, 2017 and 2016 were as follows.

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	1,782		$	1,725		$	3,563		$	3,450
Interest cost	1,756			1,780			3,512			3,560
Expected return on plan assets	(4,882		)	(5,065		)	(9,763		)	(10,130		)
Amortization of prior service cost	(18		)	12			(37		)	25
Amortization of actuarial loss	487			483			975			965
Total net pension cost	$	(875	)	$	(1,065	)	$	(1,750	)	$	(2,130	)
Postretirement Plan:
Interest cost	$	24		$	36		$	48		$	72
Amortization of prior service cost	(19		)	—			(38		)	—
Total net periodic benefit cost	$	5		$	36		$	10		$	72

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Segment Reporting

6 Months Ended

Jun. 30, 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
Six Months Ended June 30, 2017
Net interest income	$	179,259		$	179,059		$	5,775		$	364,093
Noninterest income	24,490			130,679			7,072			162,241
Total revenue	203,749			309,738			12,847			526,334
Credit provision*	23,050			10,271			(12,321		)	21,000
Noninterest expense	76,897			241,339			31,771			350,007
Income (loss) before income taxes	103,802			58,128			(6,603		)	155,327
Income tax expense (benefit)	34,012			20,345			(13,283		)	41,074
Net income	$	69,790		$	37,783		$	6,680		$	114,253
Return on average allocated capital (ROCET1)**	12.6		%	13.1		%	1.1		%	10.6		%
Six Months Ended June 30, 2016
Net interest income	$	159,233		$	170,574		$	18,897		$	348,704
Noninterest income	22,549			128,880			13,931			165,360
Total revenue	181,782			299,454			32,828			514,064
Credit provision*	27,853			12,388			(6,241		)	34,000
Noninterest expense	71,543			243,260			33,528			348,331
Income (loss) before income taxes	82,386			43,806			5,541			131,733
Income tax expense (benefit)	27,716			15,332			(2,940		)	40,108
Net income	$	54,670		$	28,474		$	8,481		$	91,625
Return on average allocated capital (ROCET1)**	10.5		%	9.1		%	3.7		%	9.2		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Average balances for YTD June 2017
Average earning assets	$	10,807,106	$	9,321,564	$	6,414,384	$	26,543,054
Average loans	10,797,831		9,319,719		181,049		20,298,599
Average deposits	6,433,870		11,456,200		3,604,524		21,494,594
Average allocated capital (CET1)**	$	1,120,082	$	582,706	$	378,104	$	2,080,892
Average balances for YTD June 2016
Average earning assets	$	9,924,378	$	9,222,677	$	6,473,156	$	25,620,211
Average loans	9,913,591		9,221,370		147,447		19,282,408
Average deposits	5,744,533		11,215,704		3,471,729		20,431,966
Average allocated capital (CET1)**	$	1,049,431	$	630,520	$	224,910	$	1,904,861
* 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.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended June 30, 2017
Net interest income	$	89,871		$	90,131		$	3,817		$	183,819
Noninterest income	12,497			65,809			4,104			82,410
Total revenue	102,368			155,940			7,921			266,229
Credit provision*	11,470			5,764			(5,234		)	12,000
Noninterest expense	39,418			125,242			11,656			176,316
Income (loss) before income taxes	51,480			24,934			1,499			77,913
Income tax expense (benefit)	16,363			8,727			(5,160		)	19,930
Net income	$	35,117		$	16,207		$	6,659		$	57,983
Return on average allocated capital (ROCET1)**	12.5		%	11.0		%	4.5		%	10.6		%
Three Months Ended June 30, 2016
Net interest income	$	80,069		$	84,969		$	11,679		$	176,717
Noninterest income	10,936			65,132			6,100			82,168
Total revenue	91,005			150,101			17,779			258,885
Credit provision*	15,114			6,246			(7,360		)	14,000
Noninterest expense	37,140			121,965			15,255			174,360
Income (loss) before income taxes	38,751			21,890			9,884			70,525
Income tax expense (benefit)	13,137			7,662			635			21,434
Net income	$	25,614		$	14,228		$	9,249		$	49,091
Return on average allocated capital (ROCET1)**	9.7		%	9.0		%	13.4		%	9.9		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended June 30, 2017
Average earning assets	$	10,853,881	$	9,510,571	$	6,380,103	$	26,744,555
Average loans	10,841,858		9,508,683		171,449		20,521,990
Average deposits	6,447,190		11,574,028		3,501,931		21,523,149
Average allocated capital (CET1)**	$	1,125,494	$	588,880	$	385,451	$	2,099,825
Three Months Ended June 30, 2016
Average earning assets	$	10,128,726	$	9,325,036	$	6,514,287	$	25,968,049
Average loans	10,115,959		9,323,720		202,306		19,641,985
Average deposits	5,570,919		11,331,214		3,386,820		20,288,953
Average allocated capital (CET1)**	$	1,067,203	$	633,829	$	212,209	$	1,913,241
* 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)

6 Months Ended

Jun. 30, 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 , changes, and reclassifications out of accumulated other comprehensive income (loss).

($ 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 income before reclassifications	3,632			—			3,632
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			900			900
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(2,575		)	—			(2,575		)
Income tax expense	(406		)	(342		)	(748		)
Net other comprehensive income during period	651			558			1,209
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)
Balance January 1, 2016	$	459		$	(33,075	)	$	(32,616	)
Other comprehensive income before reclassifications	82,743			—			82,743
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(6,214		)	—			(6,214		)
Personnel expense	—			990			990
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(3,024		)	—			(3,024		)
Income tax expense	(28,048		)	(378		)	(28,426		)
Net other comprehensive income during period	45,457			612			46,069
Balance June 30, 2016	$	45,916		$	(32,463	)	$	13,453
	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2017	$	(22,023	)	$	(34,321	)	$	(56,344	)
Other comprehensive income before reclassifications	5,744			—			5,744
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			450			450
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,548		)	—			(1,548		)
Income tax expense	(1,601		)	(171		)	(1,772		)
Net other comprehensive income during period	2,595			279			2,874
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)
Balance April 1, 2016	$	34,936		$	(32,769	)	$	2,167
Other comprehensive income before reclassifications	22,321			—			22,321
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(3,116		)	—			(3,116		)
Personnel expense	—			495			495
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,452		)	—			(1,452		)
Income tax expense	(6,773		)	(189		)	(6,962		)
Net other comprehensive income during period	10,980			306			11,286
Balance June 30, 2016	$	45,916		$	(32,463	)	$	13,453

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Recent Developments

6 Months Ended

Jun. 30, 2017

Subsequent Events [Abstract]

Recent Developments

Recent Developments

On July 20, 2017, the Corporation announced the signing of a definitive merger agreement with Bank Mutual Corporation ("Bank Mutual") in an all-stock stock transaction.  Bank Mutual Corporation is a bank holding company and the parent for BankMutual, an Office of the Comptroller of the Currency ("OCC") Chartered national bank. Based in Milwaukee, with consolidated assets of approximately $2.7 billion and deposits of approximately $1.9 billion as of June 30, 2017, BankMutual was the third largest bank, by deposit market share, headquartered in Wisconsin.   

Under the terms of the agreement, shareholders of Bank Mutual will receive 0.422 shares of the Corporation's common stock for each share of Bank Mutual common stock. The transaction is  valued at approximately $482 million based on the closing stock price on the day preceding the announcement.  The transaction is expected to be completed in early 2018, subject to the customary closing conditions, regulatory approvals, and the approval of Bank Mutual's shareholders.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 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 for 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)

6 Months Ended

Jun. 30, 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 June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
	(In thousands, except per share data)
Net income	$	57,983		$	49,091		$	114,253		$	91,625
Preferred stock dividends	(2,339		)	(2,169		)	(4,669		)	(4,367		)
Net income available to common equity	$	55,644		$	46,922		$	109,584		$	87,258
Common shareholder dividends	(18,326		)	(16,443		)	(36,577		)	(32,646		)
Unvested share-based payment awards	(110		)	(182		)	(227		)	(388		)
Undistributed earnings	$	37,208		$	30,297		$	72,780		$	54,224
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Undistributed earnings allocated to unvested share-based payment awards	228			334			507			575
Undistributed earnings	$	37,208		$	30,297		$	72,780		$	54,224
Basic
Distributed earnings to common shareholders	$	18,326		$	16,443		$	36,577		$	32,646
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Total common shareholders earnings, basic	$	55,306		$	46,406		$	108,850		$	86,295
Diluted
Distributed earnings to common shareholders	$	18,326		$	16,443		$	36,577		$	32,646
Undistributed earnings allocated to common shareholders	36,980			29,963			72,273			53,649
Total common shareholders earnings, diluted	$	55,306		$	46,406		$	108,850		$	86,295
Weighted average common shares outstanding	151,573			148,511			151,196			148,556
Effect of dilutive common stock awards	1,958			1,019			2,155			962
Effect of dilutive common stock warrants	771			—			796			—
Diluted weighted average common shares outstanding	154,302			149,530			154,147			149,518
Basic earnings per common share	$	0.36		$	0.31		$	0.72		$	0.58
Diluted earnings per common share	$	0.36		$	0.31		$	0.71		$	0.58

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2017

Retirement Benefits [Abstract]

Fair value assumptions of stock options

The following assumptions were used in estimating the fair value for options granted in the first six 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 six months ended June 30, 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	(1,217,640	)	16.27
Forfeited or expired	(447,751	)	33.58
Outstanding at June 30, 2017	5,492,010		$	18.10	6.80	$	39,339
Options Exercisable at June 30, 2017	3,120,596		$	16.53	5.47	$	27,075

Summary of Restricted Stock Awards Activity (Excluding Salary Shares)

The following table summarizes information about the Corporation’s restricted stock activity for the six months ended June 30, 2017.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	2,377,380		$	17.40
Granted	737,080		25.58
Vested	(851,381	)	17.88
Forfeited	(61,616	)	18.41
Outstanding at June 30, 2017	2,201,463		$	19.94

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 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.

June 30, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,004	$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	534,058		13,873		(1,406		)	546,525
GNMA	1,729,386		1,894		(17,102		)	1,714,178
Private-label	1,102		—		(16		)	1,086
GNMA commercial mortgage-related securities	1,443,501		74		(23,703		)	1,419,872
Other securities (debt and equity)	4,718		116		(27		)	4,807
Total investment securities available for sale	$	3,713,769	$	15,957	$	(42,256	)	$	3,687,470
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,162,920	$	13,766	$	(4,320	)	$	1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	43,575		430		(566		)	43,439
GNMA	473,517		4,048		(3,214		)	474,351
GNMA commercial mortgage-related securities	575,383		8,964		(11,181		)	573,166
Total investment securities held to maturity	$	2,255,395	$	27,208	$	(19,281	)	$	2,263,322

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.

June 30, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,004	$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	534,058		13,873		(1,406		)	546,525
GNMA	1,729,386		1,894		(17,102		)	1,714,178
Private-label	1,102		—		(16		)	1,086
GNMA commercial mortgage-related securities	1,443,501		74		(23,703		)	1,419,872
Other securities (debt and equity)	4,718		116		(27		)	4,807
Total investment securities available for sale	$	3,713,769	$	15,957	$	(42,256	)	$	3,687,470
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,162,920	$	13,766	$	(4,320	)	$	1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	43,575		430		(566		)	43,439
GNMA	473,517		4,048		(3,214		)	474,351
GNMA commercial mortgage-related securities	575,383		8,964		(11,181		)	573,166
Total investment securities held to maturity	$	2,255,395	$	27,208	$	(19,281	)	$	2,263,322

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 June 30, 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
	Amortized Cost		Fair Value			Amortized Cost		Fair Value
	($ in Thousands)
Due in one year or less	$	1,500	$	1,506		$	41,085	$	33,447
Due after one year through five years	4,204		4,175			239,986		246,760
Due after five years through ten years	—		—			261,149		265,255
Due after ten years	—		—			620,700		626,904
Total debt securities	5,704		5,681			1,162,920		1,172,366
Residential mortgage-related securities:
FNMA / FHLMC	534,058		546,525			43,575		43,439
GNMA	1,729,386		1,714,178			473,517		474,351
Private-label	1,102		1,086			—		—
GNMA commercial mortgage-related securities	1,443,501		1,419,872			575,383		573,166
Equity securities	18		128			—		—
Total investment securities	$	3,713,769	$	3,687,470		$	2,255,395	$	2,263,322
Ratio of Fair Value to Amortized Cost			99.3		%			100.4		%

Realized gains and losses and proceeds from sale

The proceeds from the sale of investment securities for the first six months ended June 30, 2017 and 2016 are shown below.

	Six Months Ended June 30,
	2017			2016
	($ in Thousands)
Gross gains on available for sale securities	$	—		$	6,403
Gross gains on held to maturity securities	361			—
Total gains	361			6,403
Gross losses on available for sale securities	—			(189		)
Gross losses on held to maturity securities	$	(5	)	$	—
Total losses	$	(5	)	$	(189	)
Investment securities gains, net	$	356		$	6,214
Proceeds from sales of investment securities	$	16,059		$	359,484

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 June 30, 2017.

	Less than 12 months						12 months or more						Total
June 30, 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:
U.S. Treasury securities	1	$	(2	)	$	1,002	—	$	—		$	—	$	(2	)	$	1,002
Residential mortgage-related securities:
FNMA / FHLMC	18	(1,406		)	223,326		—	—			—		(1,406		)	223,326
GNMA	42	(16,220		)	1,186,468		1	(882		)	35,695		(17,102		)	1,222,163
Private-label	—	—			—		1	(16		)	1,084		(16		)	1,084
GNMA commercial mortgage-related securities	54	(8,627		)	850,180		31	(15,076		)	496,698		(23,703		)	1,346,878
Other securities (debt and equity)	3	(27		)	2,173		—	—			—		(27		)	2,173
Total	118	$	(26,282	)	$	2,263,149	33	$	(15,974	)	$	533,477	$	(42,256	)	$	2,796,626
Investment securities held to maturity:
Municipal securities	301	$	(4,186	)	$	222,642	9	$	(134	)	$	4,814	$	(4,320	)	$	227,456
Residential mortgage-related securities:
FNMA / FHLMC	18	(377		)	25,507		1	(189		)	5,657		(566		)	31,164
GNMA	45	(3,192		)	358,551		1	(22		)	1,246		(3,214		)	359,797
GNMA commercial mortgage-related securities	14	(3,683		)	301,594		10	(7,498		)	241,385		(11,181		)	542,979
Total	378	$	(11,438	)	$	908,294	21	$	(7,843	)	$	253,102	$	(19,281	)	$	1,161,396

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)

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Loan composition

The period end loan composition was as follows.

	June 30, 2017		December 31, 2016
	($ in Thousands)
Commercial and industrial	$	6,571,000	$	6,489,014
Commercial real estate — owner occupied	845,336		897,724
Commercial and business lending	7,416,336		7,386,738
Commercial real estate — investor	3,329,585		3,574,732
Real estate construction	1,651,805		1,432,497
Commercial real estate lending	4,981,390		5,007,229
Total commercial	12,397,726		12,393,967
Residential mortgage	7,115,457		6,332,327
Home equity	897,111		934,443
Other consumer	372,775		393,979
Total consumer	8,385,343		7,660,749
Total loans	$	20,783,069	$	20,054,716

Commercial and consumer loans by credit quality indicator

The following table presents commercial and consumer loans by credit quality indicator at June 30, 2017.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,183,037	$	103,881	$	142,607	$	141,475	$	6,571,000
Commercial real estate - owner occupied	754,446		14,366		60,724		15,800		845,336
Commercial and business lending	6,937,483		118,247		203,331		157,275		7,416,336
Commercial real estate - investor	3,260,187		13,623		48,569		7,206		3,329,585
Real estate construction	1,621,198		19,989		8,901		1,717		1,651,805
Commercial real estate lending	4,881,385		33,612		57,470		8,923		4,981,390
Total commercial	11,818,868		151,859		260,801		166,198		12,397,726
Residential mortgage	7,060,673		1,233		1,576		51,975		7,115,457
Home equity	882,253		1,168		208		13,482		897,111
Other consumer	372,018		524		—		233		372,775
Total consumer	8,314,944		2,925		1,784		65,690		8,385,343
Total	$	20,133,812	$	154,784	$	262,585	$	231,888	$	20,783,069

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 June 30, 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	$	6,428,022	$	1,042	$	213	$	248	$	141,475	$	6,571,000
Commercial real estate - owner occupied	828,252		1,136		148		—		15,800		845,336
Commercial and business lending	7,256,274		2,178		361		248		157,275		7,416,336
Commercial real estate - investor	3,321,480		899		—		—		7,206		3,329,585
Real estate construction	1,649,953		40		95		—		1,717		1,651,805
Commercial real estate lending	4,971,433		939		95		—		8,923		4,981,390
Total commercial	12,227,707		3,117		456		248		166,198		12,397,726
Residential mortgage	7,054,317		8,163		1,002		—		51,975		7,115,457
Home equity	877,705		4,755		1,169		—		13,482		897,111
Other consumer	369,509		1,113		633		1,287		233		372,775
Total consumer	8,301,531		14,031		2,804		1,287		65,690		8,385,343
Total	$	20,529,238	$	17,148	$	3,260	$	1,535	$	231,888	$	20,783,069

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2017 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$180 million or 78% were current with respect to payment at June 30, 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 June 30, 2017.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	89,563	$	94,231	$	17,882	$	95,205	$	635
Commercial real estate — owner occupied	7,249		9,154		526		6,086		93
Commercial and business lending	96,812		103,385		18,408		101,291		728
Commercial real estate — investor	15,832		16,111		330		15,782		767
Real estate construction	1,819		2,188		707		1,868		54
Commercial real estate lending	17,651		18,299		1,037		17,650		821
Total commercial	114,463		121,684		19,445		118,941		1,549
Residential mortgage	60,209		65,163		10,649		60,831		1,112
Home equity	20,927		22,907		9,665		21,232		484
Other consumer	1,315		1,342		229		1,335		12
Total consumer	82,451		89,412		20,543		83,398		1,608
Total loans(a)	$	196,914	$	211,096	$	39,988	$	202,339	$	3,157
Loans with no related allowance
Commercial and industrial	$	83,452	$	107,471	$	—	$	104,989	$	173
Commercial real estate — owner occupied	12,696		13,546		—		12,906		49
Commercial and business lending	96,148		121,017		—		117,895		222
Commercial real estate — investor	6,002		6,466		—		6,071		—
Real estate construction	219		222		—		222		—
Commercial real estate lending	6,221		6,688		—		6,293		—
Total commercial	102,369		127,705		—		124,188		222
Residential mortgage	9,390		10,246		—		9,461		101
Home equity	540		543		—		540		—
Other consumer	—		—		—		—		—
Total consumer	9,930		10,789		—		10,001		101
Total loans(a)	$	112,299	$	138,494	$	—	$	134,189	$	323
Total
Commercial and industrial	$	173,015	$	201,702	$	17,882	$	200,194	$	808
Commercial real estate — owner occupied	19,945		22,700		526		18,992		142
Commercial and business lending	192,960		224,402		18,408		219,186		950
Commercial real estate — investor	21,834		22,577		330		21,853		767
Real estate construction	2,038		2,410		707		2,090		54
Commercial real estate lending	23,872		24,987		1,037		23,943		821
Total commercial	216,832		249,389		19,445		243,129		1,771
Residential mortgage	69,599		75,409		10,649		70,292		1,213
Home equity	21,467		23,450		9,665		21,772		484
Other consumer	1,315		1,342		229		1,335		12
Total consumer	92,381		100,201		20,543		93,399		1,709
Total loans(a)	$	309,213	$	349,590	$	39,988	$	336,528	$	3,480

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 77% of the unpaid principal balance at June 30, 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.

	June 30, 2017				December 31, 2016
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	31,540	$	27,016	$	31,884	$	1,276
Commercial real estate — owner occupied	4,145		2,145		5,490		2,220
Commercial real estate — investor	14,628		602		15,289		924
Real estate construction	321		164		359		150
Residential mortgage	17,624		19,365		18,100		21,906
Home equity	7,985		2,401		7,756		2,877
Other consumer	1,082		22		979		32
Total	$	77,325	$	51,715	$	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 six months ended June 30, 2017 and 2016, respectively, and the recorded investment and unpaid principal balance as of June 30, 2017 and 2016 respectively.

	Six Months Ended June 30, 2017					Six Months Ended June 30, 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	24	$	30,935	$	52,260	11	$	2,608	$	2,676
Commercial real estate — owner occupied	2	716		716		1	120		126
Residential mortgage	36	2,695		2,805		48	3,942		4,171
Home equity	26	674		919		37	1,433		1,554
Total	88	$	35,020	$	56,700	97	$	8,103	$	8,527

(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 six months ended June 30, 2017 and 2016, respectively, as well as the recorded investment in these restructured loans as of June 30, 2017 and 2016, respectively.

	Six Months Ended June 30, 2017			Six Months Ended June 30, 2016
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate — owner occupied	—	$	—	2	$	168
Residential mortgage	17	941		25	2,407
Home equity	9	271		11	164
Total	26	$	1,212	38	$	2,739

Changes in the allowance for loan losses by portfolio segment

A summary of the changes in the allowance for loan losses by portfolio segment for the six months ended June 30, 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	(21,912		)	(83		)	(803		)	(62		)	(1,034		)	(1,196		)	(2,140		)	(27,230		)
Recoveries	6,498			145			163			47			342			1,423			378			8,996
Net charge offs	(15,414		)	62			(640		)	(15		)	(692		)	227			(1,762		)	(18,234		)
Provision for loan losses	18,295			(5,551		)	(3,155		)	4,571			5,212			(351		)	1,979			21,000
June 30, 2017	$	143,007		$	8,545		$	41,490		$	31,488		$	31,566		$	20,240		$	4,765		$	281,101
Allowance for loan losses:
Impaired loans:
Individually evaluated	$	17,350		$	187		$	183		$	—		$	106		$	—		$	—		$	17,826
Collectively evaluated	532			339			147			707			10,543			9,665			229			22,162
Total impaired loans	17,882			526			330			707			10,649			9,665			229			39,988
Non-impaired loans:
Collectively evaluated	125,125			8,019			41,160			30,781			20,917			10,575			4,536			241,113
Total	$	143,007		$	8,545		$	41,490		$	31,488		$	31,566		$	20,240		$	4,765		$	281,101
Period end loan balances:
Impaired loans:
Individually evaluated	$	140,061		$	15,303		$	6,799		$	220		$	11,060		$	643		$	—		$	174,086
Collectively evaluated	32,954			4,642			15,035			1,818			58,539			20,824			1,315			135,127
Total impaired loans	173,015			19,945			21,834			2,038			69,599			21,467			1,315			309,213
Non-impaired loans:
Collectively evaluated	6,397,985			825,391			3,307,751			1,649,767			7,045,858			875,644			371,460			20,473,856
Total	$	6,571,000		$	845,336		$	3,329,585		$	1,651,805		$	7,115,457		$	897,111		$	372,775		$	20,783,069

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:
Impaired loans:
Individually evaluated	$	20,836		$	—		$	3,117		$	—		$	147		$	3		$	—		$	24,103
Collectively evaluated	781			295			424			441			10,944			9,309			186			22,380
Total impaired loans	21,617			295			3,541			441			11,091			9,312			186			46,483
Non-impaired loans:
Collectively evaluated	118,509			13,739			41,744			26,491			15,955			11,052			4,362			231,852
Total	$	140,126		$	14,034		$	45,285		$	26,932		$	27,046		$	20,364		$	4,548		$	278,335
Period end loan balances:
Impaired loans:
Individually evaluated	$	180,965		$	8,439		$	17,322		$	—		$	7,033		$	650		$	—		$	214,409
Collectively evaluated	34,290			6,595			16,018			1,203			61,303			20,107			1,235			140,751
Total impaired loans	215,255			15,034			33,340			1,203			68,336			20,757			1,235			355,160
Non-impaired loans:
Collectively evaluated	6,273,759			882,690			3,541,392			1,431,294			6,263,991			913,686			392,744			19,699,556
Total	$	6,489,014		$	897,724		$	3,574,732		$	1,432,497		$	6,332,327		$	934,443		$	393,979		$	20,054,716

Changes in the allowance for unfunded commitments

A summary of the changes in the allowance for unfunded commitments was as follows.

	Six Months Ended June 30, 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
Balance at end of period	$	25,400	$	25,400

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Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	4,385
Accumulated amortization	(4,385		)	(4,273		)
Net book value	$	—		$	112
Amortization during the year	$	112		$	281
Other intangibles:
Gross carrying amount	$	32,572		$	32,410
Accumulated amortization	(18,042		)	(17,145		)
Net book value	$	14,530		$	15,265
Additions during the period	$	162		$	1,012
Amortization during the year	$	897		$	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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,085		$	62,150
Additions	3,278			12,262
Amortization	(5,084		)	(12,327		)
Mortgage servicing rights at end of period	$	60,279		$	62,085
Valuation allowance at beginning of period	(609		)	(809		)
(Additions) recoveries, net	(275		)	200
Valuation allowance at end of period	(884		)	(609		)
Mortgage servicing rights, net	$	59,395		$	61,476
Fair value of mortgage servicing rights	$	64,627		$	73,149
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,768,374		$	7,974,742
Mortgage servicing rights, net to servicing portfolio	0.76		%	0.77		%
Mortgage servicing rights expense (a)	$	5,359		$	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 June 30, 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	Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Six months ending December 31, 2017	$	901	$	5,046
2018	1,771		8,897
2019	1,472		7,476
2020	1,355		6,292
2021	1,331		5,315
2022	1,308		4,515
Beyond 2022	6,392		22,738
Total Estimated Amortization Expense	$	14,530	$	60,279

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Short and Long-Term Funding (Tables)

6 Months Ended

Jun. 30, 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.

	June 30, 2017			December 31, 2016
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	345,350		$	208,150
Securities sold under agreements to repurchase	262,319			300,197
Federal funds purchased and securities sold under agreements to repurchase	$	607,669		$	508,347
FHLB advances	697,000			482,000
Commercial paper	97,813			101,688
Other short-term funding	794,813			583,688
Total short-term funding	$	1,402,482		$	1,092,035
Long-Term Funding
FHLB advances	$	2,765,176		$	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	(3,056		)	(3,393		)
Total long-term funding	3,262,120			2,761,795
Total short and long-term funding	$	4,664,602		$	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 June 30, 2017 and December 31, 2016 are presented in the following table.

	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous		Up to 30 days		30-90 days		Greater than 90 days		Total
June 30, 2017					($ in Thousands)
Repurchase agreements
Agency mortgage-related securities	$	262,319	$	—	$	—	$	—	$	262,319
Total	$	262,319	$	—	$	—	$	—	$	262,319
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)

6 Months Ended

Jun. 30, 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.

	June 30, 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	$	2,118,409	$	28,105		Trading assets	$	2,039,323	$	33,671		Trading assets
Interest rate-related instruments — customer and mirror	2,118,409		(27,691		)	Trading liabilities	2,039,323		(33,188		)	Trading liabilities
Foreign currency exchange forwards	93,300		1,480			Trading assets	109,675		2,002			Trading assets
Foreign currency exchange forwards	92,969		(1,412		)	Trading liabilities	106,251		(1,943		)	Trading liabilities
Commodity contracts	304,554		18,991			Trading assets	127,582		16,725			Trading assets
Commodity contracts	303,790		(18,040		)	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.

	June 30, 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)	356,798	2,680		Other assets	285,345	206		Other assets
Forward commitments (mortgage)	151,500	159		Other assets	179,600	2,908		Other assets
Purchased options (time deposit)	75,899	1,531		Other assets	80,554	2,576		Other assets
Written options (time deposit)	75,899	(1,531	)	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 Six Months Ended June 30,
($ in Thousands)		2017			2016
Derivative Instruments:
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(69	)	$	(1,426	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	2,474			3,312
Forward commitments (mortgage)	Mortgage banking, net	(2,749		)	(4,608		)
Foreign currency exchange forwards	Capital market fees, net	9			(48		)
Commodity contracts	Capital market fees, net	198			358

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Balance Sheet Offsetting (Tables)

6 Months Ended

Jun. 30, 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)
June 30, 2017
Derivative assets:
Interest and commodity agreements	$	24,322	$	—	$	24,322	$	(16,517	)	$	(7,805	)	$	—
Derivative liabilities:
Interest and commodity agreements	$	16,517	$	—	$	16,517	$	(16,517	)	$	—		$	—
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, Legal Proceedings and Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of lending-related and other commitments

The following is a summary of lending-related commitments.

	June 30, 2017		December 31, 2016
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	8,063,899	$	8,131,131
Commercial letters of credit(a)	5,839		7,923
Standby letters of credit(c)	242,144		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 June 30, 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 $2 million at June 30, 2017 and $3 million at 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.

	Six Months Ended June 30, 2017			Year Ended December 31, 2016
	($ in Thousands)
Balance at beginning of period	$	900		$	1,197
Repurchase provision expense	109			456
Adjustments to provision expense	—			(750		)
Charge offs, net	(18		)	(3		)
Balance at end of period	$	991		$	900

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2017 and December 31, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Hierarchy	June 30, 2017		December 31, 2016
		($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	Level 1	$	1,002	$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	Level 2	546,525		639,930
GNMA	Level 2	1,714,178		2,004,475
Private-label	Level 2	1,086		1,121
GNMA commercial mortgage-related securities	Level 2	1,419,872		2,028,898
Other securities (debt and equity)	Level 1	1,634		1,602
Other securities (debt and equity)	Level 2	3,173		3,000
Other securities (debt and equity)	Level 3	—		200
Total investment securities available for sale	Level 1	2,636		2,602
Total investment securities available for sale	Level 2	3,684,834		4,677,424
Total investment securities available for sale	Level 3	—		200
Residential loans held for sale (a)	Level 2	41,620		—
Interest rate-related instruments	Level 2	28,105		33,671
Foreign currency exchange forwards	Level 2	1,480		2,002
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	2,680		206
Forward commitments to sell residential mortgage loans	Level 3	159		2,908
Commodity contracts	Level 2	18,991		16,725
Purchased options (time deposit)	Level 2	1,531		2,576
Liabilities:
Interest rate-related instruments	Level 2	$	27,691	$	33,188
Foreign currency exchange forwards	Level 2	1,412		1,943
Commodity contracts	Level 2	18,040		15,972
Written options (time deposit)	Level 2	1,531		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.

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 six months ended June 30, 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	—			(275		)
Transfer out of level 3 securities(a)	(200		)	—
Balance June 30, 2017	$	—		$	2,839

(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
June 30, 2017
Assets:
Commercial loans held for sale (a)	Level 2	$	4,772	Provision for credit losses	$	—
Impaired loans (c)	Level 3	74,937		Provision for credit losses (d)	(16,462		)
Other real estate owned	Level 2	1,999		Foreclosure / OREO expense, net	(621		)
Mortgage servicing rights	Level 3	64,627		Mortgage banking, net	(275		)
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 (d)	(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 June 30, 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.

(c) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

(d) Represents provision for credit losses on individually evaluated impaired loans.

Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block]

The table below presents information about these inputs and further discussion is found above.

	Valuation Technique	Significant Unobservable Input	Weighted Average Input Applied
June 30, 2017
Mortgage servicing rights	Discounted cash flow	Discount rate	11%
Mortgage servicing rights	Discounted cash flow	Constant prepayment rate	11%
Impaired Loans	Appraisals / Discounted cash flow	Collateral / Discount factor	20%

Estimated fair values of financial instruments

Fair value estimates, methods, and assumptions are set forth below for the Corporation’s financial instruments.

		June 30, 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	$	396,677	$	396,677	$	446,558	$	446,558
Interest-bearing deposits in other financial institutions	Level 1	126,232		126,232		149,175		149,175
Federal funds sold and securities purchased under agreements to resell	Level 1	43,000		43,000		46,500		46,500
Investment securities held to maturity	Level 2	2,255,395		2,263,322		1,273,536		1,264,674
Investment securities available for sale	Level 1	2,636		2,636		2,602		2,602
Investment securities available for sale	Level 2	3,684,834		3,684,834		4,677,424		4,677,424
Investment securities available for sale	Level 3	—		—		200		200
FHLB and Federal Reserve Bank stocks	Level 2	181,180		181,180		140,001		140,001
Commercial loans held for sale	Level 2	4,772		4,772		12,474		12,474
Residential loans held for sale	Level 2	41,620		41,620		108,010		108,010
Loans, net	Level 3	20,501,968		20,377,586		19,776,381		19,680,317
Bank owned life insurance	Level 2	588,440		588,440		585,290		585,290
Derivatives (trading and other assets)	Level 2	50,107		50,107		54,974		54,974
Derivatives (trading and other assets)	Level 3	2,839		2,839		3,114		3,114
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	19,677,850	$	19,677,850	$	20,282,321	$	20,282,321
Brokered CDs and other time deposits	Level 2	1,940,330		1,940,330		1,606,127		1,606,127
Short-term funding	Level 2	1,402,482		1,402,482		1,092,035		1,092,035
Long-term funding	Level 2	3,262,120		3,288,139		2,761,795		2,791,841
Standby letters of credit (a)	Level 2	2,394		2,394		2,566		2,566
Derivatives (trading and other liabilities)	Level 2	48,674		48,674		53,679		53,679

(a) The commitment on standby letters of credit was $242 million and $260 million at June 30, 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)

6 Months Ended

Jun. 30, 2017

Defined Benefit Plan [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 and six months ended June 30, 2017 and 2016 were as follows.

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	1,782		$	1,725		$	3,563		$	3,450
Interest cost	1,756			1,780			3,512			3,560
Expected return on plan assets	(4,882		)	(5,065		)	(9,763		)	(10,130		)
Amortization of prior service cost	(18		)	12			(37		)	25
Amortization of actuarial loss	487			483			975			965
Total net pension cost	$	(875	)	$	(1,065	)	$	(1,750	)	$	(2,130	)
Postretirement Plan:
Interest cost	$	24		$	36		$	48		$	72
Amortization of prior service cost	(19		)	—			(38		)	—
Total net periodic benefit cost	$	5		$	36		$	10		$	72

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 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
Six Months Ended June 30, 2017
Net interest income	$	179,259		$	179,059		$	5,775		$	364,093
Noninterest income	24,490			130,679			7,072			162,241
Total revenue	203,749			309,738			12,847			526,334
Credit provision*	23,050			10,271			(12,321		)	21,000
Noninterest expense	76,897			241,339			31,771			350,007
Income (loss) before income taxes	103,802			58,128			(6,603		)	155,327
Income tax expense (benefit)	34,012			20,345			(13,283		)	41,074
Net income	$	69,790		$	37,783		$	6,680		$	114,253
Return on average allocated capital (ROCET1)**	12.6		%	13.1		%	1.1		%	10.6		%
Six Months Ended June 30, 2016
Net interest income	$	159,233		$	170,574		$	18,897		$	348,704
Noninterest income	22,549			128,880			13,931			165,360
Total revenue	181,782			299,454			32,828			514,064
Credit provision*	27,853			12,388			(6,241		)	34,000
Noninterest expense	71,543			243,260			33,528			348,331
Income (loss) before income taxes	82,386			43,806			5,541			131,733
Income tax expense (benefit)	27,716			15,332			(2,940		)	40,108
Net income	$	54,670		$	28,474		$	8,481		$	91,625
Return on average allocated capital (ROCET1)**	10.5		%	9.1		%	3.7		%	9.2		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Average balances for YTD June 2017
Average earning assets	$	10,807,106	$	9,321,564	$	6,414,384	$	26,543,054
Average loans	10,797,831		9,319,719		181,049		20,298,599
Average deposits	6,433,870		11,456,200		3,604,524		21,494,594
Average allocated capital (CET1)**	$	1,120,082	$	582,706	$	378,104	$	2,080,892
Average balances for YTD June 2016
Average earning assets	$	9,924,378	$	9,222,677	$	6,473,156	$	25,620,211
Average loans	9,913,591		9,221,370		147,447		19,282,408
Average deposits	5,744,533		11,215,704		3,471,729		20,431,966
Average allocated capital (CET1)**	$	1,049,431	$	630,520	$	224,910	$	1,904,861
* 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.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended June 30, 2017
Net interest income	$	89,871		$	90,131		$	3,817		$	183,819
Noninterest income	12,497			65,809			4,104			82,410
Total revenue	102,368			155,940			7,921			266,229
Credit provision*	11,470			5,764			(5,234		)	12,000
Noninterest expense	39,418			125,242			11,656			176,316
Income (loss) before income taxes	51,480			24,934			1,499			77,913
Income tax expense (benefit)	16,363			8,727			(5,160		)	19,930
Net income	$	35,117		$	16,207		$	6,659		$	57,983
Return on average allocated capital (ROCET1)**	12.5		%	11.0		%	4.5		%	10.6		%
Three Months Ended June 30, 2016
Net interest income	$	80,069		$	84,969		$	11,679		$	176,717
Noninterest income	10,936			65,132			6,100			82,168
Total revenue	91,005			150,101			17,779			258,885
Credit provision*	15,114			6,246			(7,360		)	14,000
Noninterest expense	37,140			121,965			15,255			174,360
Income (loss) before income taxes	38,751			21,890			9,884			70,525
Income tax expense (benefit)	13,137			7,662			635			21,434
Net income	$	25,614		$	14,228		$	9,249		$	49,091
Return on average allocated capital (ROCET1)**	9.7		%	9.0		%	13.4		%	9.9		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended June 30, 2017
Average earning assets	$	10,853,881	$	9,510,571	$	6,380,103	$	26,744,555
Average loans	10,841,858		9,508,683		171,449		20,521,990
Average deposits	6,447,190		11,574,028		3,501,931		21,523,149
Average allocated capital (CET1)**	$	1,125,494	$	588,880	$	385,451	$	2,099,825
Three Months Ended June 30, 2016
Average earning assets	$	10,128,726	$	9,325,036	$	6,514,287	$	25,968,049
Average loans	10,115,959		9,323,720		202,306		19,641,985
Average deposits	5,570,919		11,331,214		3,386,820		20,288,953
Average allocated capital (CET1)**	$	1,067,203	$	633,829	$	212,209	$	1,913,241
* 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)

6 Months Ended

Jun. 30, 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 , changes, and reclassifications out of accumulated other comprehensive income (loss).

($ 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 income before reclassifications	3,632			—			3,632
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			900			900
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(2,575		)	—			(2,575		)
Income tax expense	(406		)	(342		)	(748		)
Net other comprehensive income during period	651			558			1,209
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)
Balance January 1, 2016	$	459		$	(33,075	)	$	(32,616	)
Other comprehensive income before reclassifications	82,743			—			82,743
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(6,214		)	—			(6,214		)
Personnel expense	—			990			990
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(3,024		)	—			(3,024		)
Income tax expense	(28,048		)	(378		)	(28,426		)
Net other comprehensive income during period	45,457			612			46,069
Balance June 30, 2016	$	45,916		$	(32,463	)	$	13,453
	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2017	$	(22,023	)	$	(34,321	)	$	(56,344	)
Other comprehensive income before reclassifications	5,744			—			5,744
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			450			450
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,548		)	—			(1,548		)
Income tax expense	(1,601		)	(171		)	(1,772		)
Net other comprehensive income during period	2,595			279			2,874
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)
Balance April 1, 2016	$	34,936		$	(32,769	)	$	2,167
Other comprehensive income before reclassifications	22,321			—			22,321
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(3,116		)	—			(3,116		)
Personnel expense	—			495			495
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,452		)	—			(1,452		)
Income tax expense	(6,773		)	(189		)	(6,962		)
Net other comprehensive income during period	10,980			306			11,286
Balance June 30, 2016	$	45,916		$	(32,463	)	$	13,453

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Acquisitions (Details Textuals) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) acquisition	Mar. 31, 2016 USD ($) acquisition	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Calculations for basic and diluted earnings per common share
Net income	$ 57,983	$ 49,091	$ 114,253	$ 91,625
Preferred stock dividends	(2,339)	(2,169)	(4,669)	(4,367)
Net income available to common equity	55,644	46,922	109,584	87,258
Common shareholder dividends	(18,326)	(16,443)	(36,577)	(32,646)
Unvested share-based payment awards	(110)	(182)	(227)	(388)
Undistributed earnings	37,208	30,297	72,780	54,224
Undistributed earnings allocated to common shareholders	36,980	29,963	72,273	53,649
Undistributed earnings allocated to unvested share-based payment awards	228	334	507	575
Undistributed earnings	37,208	30,297	72,780	54,224
Basic
Distributed earnings to common shareholders	18,326	16,443	36,577	32,646
Undistributed earnings allocated to common shareholders	36,980	29,963	72,273	53,649
Total common shareholders earnings, basic	55,306	46,406	108,850	86,295
Diluted
Distributed earnings to common shareholders	18,326	16,443	36,577	32,646
Undistributed earnings allocated to common shareholders	36,980	29,963	72,273	53,649
Total common shareholders earnings, diluted	$ 55,306	$ 46,406	$ 108,850	$ 86,295
Weighted average common shares outstanding (in shares)	151,573	148,511	151,196	148,556
Effect of dilutive common stock awards (in shares)	1,958	1,019	2,155	962
Effect of dilutive common stock warrants (in shares)	771	0	796	0
Diluted weighted average common shares outstanding (in shares)	154,302	149,530	154,147	149,518
Basic earnings (loss) per common share (in usd per share)	$ 0.36	$ 0.31	$ 0.72	$ 0.58
Diluted earnings (loss) per common share (in usd per share)	$ 0.36	$ 0.31	$ 0.71	$ 0.58

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Earnings Per Common Share (Textual) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		4,000,000		4,000,000
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,000,000	4,000,000	900,000	4,000,000

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Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair value assumptions of stock options
Dividend yield	2.00%	3.00%
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)	1,217,640
Forfeited or expired (in shares)	(447,751)
Stock Options Shares Outstanding, Ending balance (in shares)	5,492,010	6,357,843
Options exercisable (in shares)	3,120,596
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)	16.27
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	33.58
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	18.10	$ 17.67
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 16.53
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months 18 days	6 years 1 month 6 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 5 months 19 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 39,339	$ 47,902
Options exercisable, Aggregate Intrinsic Value	$ 27,075

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Stock-Based Compensation, Restricted Stock Activity (Details)	6 Months Ended
	Jun. 30, 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	737,080
Vested (in shares) | shares	(851,381)
Forfeited (in shares) | shares	(61,616)
Outstanding Shares, Ending balance (in shares) | shares	2,201,463
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	25.58
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	17.88
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	18.41
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 19.94

XML

Stock-Based Compensation (Details Textuals) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Stock Based Compensation (Textuals) [Abstract]
Intrinsic value of stock options exercised	$ 11,000	$ 1,000
Total fair value of vested stock options	$ 4,000	$ 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	$ 570
Recognized compensation expense for vesting of stock options	2,000	$ 2,000
Unvested share-based payment awards	$ 7,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter 2021
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	11,000	$ 11,000
Unvested share-based payment awards	$ 26,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter 2021

XML

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment securities available for sale:
Amortized Cost	$ 3,713,769	$ 4,724,895
Gross Unrealized Gains	15,957	19,132
Gross Unrealized Losses	(42,256)	(63,801)
Fair Value	3,687,470	4,680,226
Investment securities held to maturity:
Amortized Cost	2,255,395	1,273,536
Gross Unrealized Gains	27,208	4,523
Gross Unrealized Losses	(19,281)	(13,385)
Fair Value	2,263,322	1,264,674
US Treasury Securities
Investment securities available for sale:
Amortized Cost	1,004	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Fair Value	1,002	1,000
Obligations of state and political subdivisions (municipal securities)
Investment securities held to maturity:
Amortized Cost	1,162,920	1,145,843
Gross Unrealized Gains	13,766	3,868
Gross Unrealized Losses	(4,320)	(12,036)
Fair Value	1,172,366	1,137,675
Private Label
Investment securities available for sale:
Amortized Cost	1,102	1,134
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(16)	(14)
Fair Value	1,086	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	1,443,501	2,064,508
Gross Unrealized Gains	74	356
Gross Unrealized Losses	(23,703)	(35,966)
Fair Value	1,419,872	2,028,898
Investment securities held to maturity:
Amortized Cost	575,383
Gross Unrealized Gains	8,964
Gross Unrealized Losses	(11,181)
Fair Value	573,166
Other Debt And Other Equity Securities
Investment securities available for sale:
Amortized Cost	4,718	4,718
Gross Unrealized Gains	116	105
Gross Unrealized Losses	(27)	(21)
Fair Value	4,807	4,802
FNMA and FHLMC | Residential Related Securities
Investment securities available for sale:
Amortized Cost	534,058	625,234
Gross Unrealized Gains	13,873	17,298
Gross Unrealized Losses	(1,406)	(2,602)
Fair Value	546,525	639,930
Investment securities held to maturity:
Amortized Cost	43,575	37,697
Gross Unrealized Gains	430	439
Gross Unrealized Losses	(566)	(693)
Fair Value	43,439	37,443
GNMA | Residential Related Securities
Investment securities available for sale:
Amortized Cost	1,729,386	2,028,301
Gross Unrealized Gains	1,894	1,372
Gross Unrealized Losses	(17,102)	(25,198)
Fair Value	1,714,178	2,004,475
Investment securities held to maturity:
Amortized Cost	473,517	89,996
Gross Unrealized Gains	4,048	216
Gross Unrealized Losses	(3,214)	(656)
Fair Value	$ 474,351	$ 89,556

XML

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Amortized Cost
Available for Sale, Due in one year or less	$ 1,500
Available for Sale, Due after one year through five years	4,204
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	3,713,769	$ 4,724,895
Fair Value
Available for Sale, Due in one year or less	1,506
Available for Sale, Due after one year through five years	4,175
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	5,681
Investment securities available for sale, at fair value	$ 3,687,470	4,680,226
Ratio of Fair Value to Amortized Cost	99.30%
Amortized Cost
Held to Maturity, Due in one year or less	$ 41,085
Held to Maturity, Due after one year through five years	239,986
Held to Maturity, Due after five years through ten years	261,149
Held to Maturity, Due after ten years	620,700
Held to Maturity, Debt Securities, Amortized Cost Basis	1,162,920
Held to Maturity Amortized Cost	2,255,395	1,273,536
Fair Value
Held to Maturity, Due in one year or less	33,447
Held to Maturity, Due after one year through five years	246,760
Held to Maturity, Due after five years through ten years	265,255
Held to Maturity, Due after ten years	626,904
Held to Maturity, Securities, Debt Securities	1,172,366
Held to Maturity, Total debt securities	$ 2,263,322	1,264,674
Ratio of Fair Value to Amortized Cost	100.40%
Private Label
Amortized Cost
Investment securities available for sale, amortized cost	$ 1,102	1,134
Fair Value
Investment securities available for sale, at fair value	1,086	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	1,443,501	2,064,508
Fair Value
Investment securities available for sale, at fair value	1,419,872	2,028,898
Amortized Cost
Held to Maturity Amortized Cost	575,383
Fair Value
Held to Maturity, Total debt securities	573,166
Equity Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	18
Fair Value
Investment securities available for sale, at fair value	128
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	534,058	625,234
Fair Value
Investment securities available for sale, at fair value	546,525	639,930
Amortized Cost
Held to Maturity Amortized Cost	43,575	37,697
Fair Value
Held to Maturity, Total debt securities	43,439	37,443
GNMA | Residential Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	1,729,386	2,028,301
Fair Value
Investment securities available for sale, at fair value	1,714,178	2,004,475
Amortized Cost
Held to Maturity Amortized Cost	473,517	89,996
Fair Value
Held to Maturity, Total debt securities	$ 474,351	$ 89,556

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Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross gains on available for sale securities	$ 0	$ 6,403
Gross gains on held to maturity securities	361	0
Total gains	361	6,403
Gross losses on available for sale securities	0	(189)
Gross losses on held to maturity securities	(5)	0
Total losses	5	189
Total investment securities gains, net	356	6,214
Proceeds from sales of securities	$ 16,059	$ 359,484

XML

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Jun. 30, 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	$ (26,282)	$ (44,266)
Unrealized losses on available for sale securities, 12 months or more	(15,974)	(19,535)
Total unrealized losses on available for sale securities	(42,256)	(63,801)
Fair value of unrealized losses on available for sale securities, less than 12 months	2,263,149	3,397,143
Fair value of unrealized losses on available for sale securities, 12 months or more	533,477	430,377
Total fair value of unrealized losses on available for sale securities	$ 2,796,626	$ 3,827,520
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	118	145
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	33	22
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (11,438)	$ (13,034)
Unrealized losses on held to maturity securities, 12 months or more	(7,843)	(351)
Total unrealized losses on held to maturity securities	$ (19,281)	$ (13,385)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	21	5
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 908,294	$ 496,296
Fair value of unrealized losses on held to maturity securities, 12 months or more	253,102	7,783
Total fair value of unrealized losses on held to maturity securities	$ 1,161,396	$ 504,079
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	378	753
US Treasury 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	$ (2)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(2)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,002
Fair value of unrealized losses on available for sale securities, 12 months or more	0
Total fair value of unrealized losses on available for sale securities	$ 1,002
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0
Obligations of state and political subdivisions (municipal securities)
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (4,186)	$ (11,937)
Unrealized losses on held to maturity securities, 12 months or more	(134)	(99)
Total unrealized losses on held to maturity securities	(4,320)	(12,036)
Fair value of unrealized losses on held to maturity securities, less than 12 months	222,642	414,186
Fair value of unrealized losses on held to maturity securities, 12 months or more	4,814	1,752
Total fair value of unrealized losses on held to maturity securities	$ 227,456	$ 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	301	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	9	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	1,084	1,119
Total fair value of unrealized losses on available for sale securities	$ 1,084	$ 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	$ (8,627)	$ (16,445)
Unrealized losses on available for sale securities, 12 months or more	(15,076)	(19,521)
Total unrealized losses on available for sale securities	(23,703)	(35,966)
Fair value of unrealized losses on available for sale securities, less than 12 months	850,180	1,427,889
Fair value of unrealized losses on available for sale securities, 12 months or more	496,698	429,258
Total fair value of unrealized losses on available for sale securities	$ 1,346,878	$ 1,857,147
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	54	74
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	31	21
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (3,683)
Unrealized losses on held to maturity securities, 12 months or more	(7,498)
Total unrealized losses on held to maturity securities	(11,181)
Fair value of unrealized losses on held to maturity securities, less than 12 months	301,594
Fair value of unrealized losses on held to maturity securities, 12 months or more	241,385
Total fair value of unrealized losses on held to maturity securities	$ 542,979
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	14
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	10
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	$ (27)	$ (21)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(27)	(21)
Fair value of unrealized losses on available for sale securities, less than 12 months	2,173	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	$ 2,173	$ 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	$ (1,406)	$ (2,602)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(1,406)	(2,602)
Fair value of unrealized losses on available for sale securities, less than 12 months	223,326	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	$ 223,326	$ 244,252
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	18	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	$ (377)	$ (441)
Unrealized losses on held to maturity securities, 12 months or more	(189)	(252)
Total unrealized losses on held to maturity securities	(566)	(693)
Fair value of unrealized losses on held to maturity securities, less than 12 months	25,507	17,477
Fair value of unrealized losses on held to maturity securities, 12 months or more	5,657	6,031
Total fair value of unrealized losses on held to maturity securities	$ 31,164	$ 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	18	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	$ (16,220)	$ (25,198)
Unrealized losses on available for sale securities, 12 months or more	(882)	0
Total unrealized losses on available for sale securities	(17,102)	(25,198)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,186,468	1,723,523
Fair value of unrealized losses on available for sale securities, 12 months or more	35,695	0
Total fair value of unrealized losses on available for sale securities	$ 1,222,163	$ 1,723,523
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	42	54
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	1	0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (3,192)	$ (656)
Unrealized losses on held to maturity securities, 12 months or more	(22)	0
Total unrealized losses on held to maturity securities	(3,214)	(656)
Fair value of unrealized losses on held to maturity securities, less than 12 months	358,551	64,633
Fair value of unrealized losses on held to maturity securities, 12 months or more	1,246	0
Total fair value of unrealized losses on held to maturity securities	$ 359,797	$ 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	45	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	1	0

XML

Investment Securities (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Investment Securities (Textuals) [Abstract]
Available-for-sale Securities, Transferred to Held-to-maturity Securities, at Carrying Value	$ 1,000,000
Held-to-maturity Securities, Sold Security, at Carrying Value	16,000
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	356
Securities pledged as collateral	2,000,000	$ 1,800,000
Federal Home Loan Bank Stock	106,000	65,000
Federal Reserve Bank Stock	$ 76,000	$ 75,000

XML

Loans, Loan Composition (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 20,783,069	$ 20,054,716
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	6,571,000	6,489,014
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans	845,336	897,724
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,416,336	7,386,738
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Total loans	3,329,585	3,574,732
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,651,805	1,432,497
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	4,981,390	5,007,229
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	12,397,726	12,393,967
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,115,457	6,332,327
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	897,111	934,443
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	372,775	393,979
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 8,385,343	$ 7,660,749

XML

Loans Loans, Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 20,783,069	$ 20,054,716
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	20,133,812	19,251,353
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	154,784	176,918
Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	262,585	351,142
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	231,888	275,303
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,571,000	6,489,014
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,183,037	5,937,119
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	103,881	141,328
Commercial and industrial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	142,607	227,196
Commercial and industrial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	141,475	183,371
Commercial real estate — owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	845,336	897,724
Commercial real estate — owner occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	754,446	805,871
Commercial real estate — owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	14,366	17,785
Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	60,724	64,524
Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	15,800	9,544
Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,416,336	7,386,738
Commercial and business lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,937,483	6,742,990
Commercial and business lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	118,247	159,113
Commercial and business lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	203,331	291,720
Commercial and business lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	157,275	192,915
Commercial real estate — investor
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,329,585	3,574,732
Commercial real estate — investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,260,187	3,491,217
Commercial real estate — investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,623	14,236
Commercial real estate — investor | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	48,569	51,228
Commercial real estate — investor | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,206	18,051
Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,651,805	1,432,497
Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,621,198	1,429,083
Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	19,989	105
Real estate construction | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,901	2,465
Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,717	844
Commercial real estate lending
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,981,390	5,007,229
Commercial real estate lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,881,385	4,920,300
Commercial real estate lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	33,612	14,341
Commercial real estate lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	57,470	53,693
Commercial real estate lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,923	18,895
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	12,397,726	12,393,967
Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,818,868	11,663,290
Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	151,859	173,454
Total commercial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	260,801	345,413
Total commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	166,198	211,810
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,115,457	6,332,327
Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,060,673	6,275,162
Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,233	1,314
Residential mortgage | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,576	5,615
Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	51,975	50,236
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	897,111	934,443
Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	882,253	919,740
Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,168	1,588
Home equity | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	208	114
Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,482	13,001
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	372,775	393,979
Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	372,018	393,161
Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	524	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	233	256
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,385,343	7,660,749
Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,314,944	7,588,063
Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,925	3,464
Total consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,784	5,729
Total consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 65,690	$ 63,493

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Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Summarized details of Loans
Current	$ 20,529,238	$ 19,756,523
Nonaccrual	231,888	275,303
Total loans	20,783,069	20,054,716
Accruing loans past due 90 days or more	2,000	2,000
Nonaccrual Loans, Current Portion	$ 180,000	$ 224,000
Percent of current nonaccrual loans	78.00%	81.00%
30-59 Days Past Due
Summarized details of Loans
Total Past Due	$ 17,148	$ 16,662
60-89 Days Past Due
Summarized details of Loans
Total Past Due	3,260	4,615
90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,535	1,613
Commercial and industrial
Summarized details of Loans
Current	6,428,022	6,303,994
Nonaccrual	141,475	183,371
Total loans	6,571,000	6,489,014
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,042	965
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	213	448
Commercial and industrial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	248	236
Commercial real estate — owner occupied
Summarized details of Loans
Current	828,252	886,796
Nonaccrual	15,800	9,544
Total loans	845,336	897,724
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,136	968
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	148	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	7,256,274	7,190,790
Nonaccrual	157,275	192,915
Total loans	7,416,336	7,386,738
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,178	1,933
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	361	864
Commercial and business lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	248	236
Commercial real estate — investor
Summarized details of Loans
Current	3,321,480	3,555,750
Nonaccrual	7,206	18,051
Total loans	3,329,585	3,574,732
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	899	431
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	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	1,649,953	1,431,284
Nonaccrual	1,717	844
Total loans	1,651,805	1,432,497
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	40	264
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	95	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	4,971,433	4,987,034
Nonaccrual	8,923	18,895
Total loans	4,981,390	5,007,229
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	939	695
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	95	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	12,227,707	12,177,824
Nonaccrual	166,198	211,810
Total loans	12,397,726	12,393,967
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,117	2,628
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	456	1,469
Total commercial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	248	236
Residential mortgage
Summarized details of Loans
Current	7,054,317	6,273,949
Nonaccrual	51,975	50,236
Total loans	7,115,457	6,332,327
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	8,163	7,298
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,002	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	877,705	915,593
Nonaccrual	13,482	13,001
Total loans	897,111	934,443
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	4,755	4,265
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,169	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	369,509	389,157
Nonaccrual	233	256
Total loans	372,775	393,979
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,113	2,471
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	633	718
Other consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,287	1,377
Total consumer
Summarized details of Loans
Current	8,301,531	7,578,699
Nonaccrual	65,690	63,493
Total loans	8,385,343	7,660,749
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	14,031	14,034
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,804	3,146
Total consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,287	$ 1,377

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Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 309,213	$ 355,160
Unpaid Principal Balance	349,590	394,588
Related Allowance	39,988	46,483
Average Recorded Investment	336,528	378,277
Interest Income Recognized	$ 3,480	$ 10,228
Net Recorded Investment of the Impaired Loans	77.00%	78.00%
Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 196,914	$ 221,012
Unpaid Principal Balance	211,096	236,876
Related Allowance	39,988	46,483
Average Recorded Investment	202,339	237,729
Interest Income Recognized	3,157	8,383
Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	112,299	134,148
Unpaid Principal Balance	138,494	157,712
Related Allowance	0	0
Average Recorded Investment	134,189	140,548
Interest Income Recognized	323	1,845
Commercial and industrial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	173,015	215,255
Unpaid Principal Balance	201,702	242,676
Related Allowance	17,882	21,617
Average Recorded Investment	200,194	229,191
Interest Income Recognized	808	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	89,563	101,770
Unpaid Principal Balance	94,231	107,813
Related Allowance	17,882	21,617
Average Recorded Investment	95,205	111,211
Interest Income Recognized	635	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	83,452	113,485
Unpaid Principal Balance	107,471	134,863
Related Allowance	0	0
Average Recorded Investment	104,989	117,980
Interest Income Recognized	173	1,519
Commercial real estate — owner occupied
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	19,945	15,034
Unpaid Principal Balance	22,700	17,907
Related Allowance	526	295
Average Recorded Investment	18,992	15,870
Interest Income Recognized	142	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	7,249	6,595
Unpaid Principal Balance	9,154	8,641
Related Allowance	526	295
Average Recorded Investment	6,086	7,111
Interest Income Recognized	93	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	12,696	8,439
Unpaid Principal Balance	13,546	9,266
Related Allowance	0	0
Average Recorded Investment	12,906	8,759
Interest Income Recognized	49	138
Commercial and business lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	192,960	230,289
Unpaid Principal Balance	224,402	260,583
Related Allowance	18,408	21,912
Average Recorded Investment	219,186	245,061
Interest Income Recognized	950	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	96,812	108,365
Unpaid Principal Balance	103,385	116,454
Related Allowance	18,408	21,912
Average Recorded Investment	101,291	118,322
Interest Income Recognized	728	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	96,148	121,924
Unpaid Principal Balance	121,017	144,129
Related Allowance	0	0
Average Recorded Investment	117,895	126,739
Interest Income Recognized	222	1,657
Commercial real estate — investor
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,834	33,340
Unpaid Principal Balance	22,577	34,155
Related Allowance	330	3,541
Average Recorded Investment	21,853	38,234
Interest Income Recognized	767	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	15,832	27,196
Unpaid Principal Balance	16,111	27,677
Related Allowance	330	3,541
Average Recorded Investment	15,782	31,142
Interest Income Recognized	767	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	6,002	6,144
Unpaid Principal Balance	6,466	6,478
Related Allowance	0	0
Average Recorded Investment	6,071	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	2,038	1,203
Unpaid Principal Balance	2,410	1,566
Related Allowance	707	441
Average Recorded Investment	2,090	1,321
Interest Income Recognized	54	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	1,819	1,203
Unpaid Principal Balance	2,188	1,566
Related Allowance	707	441
Average Recorded Investment	1,868	1,321
Interest Income Recognized	54	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	219	0
Unpaid Principal Balance	222	0
Related Allowance	0	0
Average Recorded Investment	222	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	23,872	34,543
Unpaid Principal Balance	24,987	35,721
Related Allowance	1,037	3,982
Average Recorded Investment	23,943	39,555
Interest Income Recognized	821	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	17,651	28,399
Unpaid Principal Balance	18,299	29,243
Related Allowance	1,037	3,982
Average Recorded Investment	17,650	32,463
Interest Income Recognized	821	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	6,221	6,144
Unpaid Principal Balance	6,688	6,478
Related Allowance	0	0
Average Recorded Investment	6,293	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	216,832	264,832
Unpaid Principal Balance	249,389	296,304
Related Allowance	19,445	25,894
Average Recorded Investment	243,129	284,616
Interest Income Recognized	1,771	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	114,463	136,764
Unpaid Principal Balance	121,684	145,697
Related Allowance	19,445	25,894
Average Recorded Investment	118,941	150,785
Interest Income Recognized	1,549	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	102,369	128,068
Unpaid Principal Balance	127,705	150,607
Related Allowance	0	0
Average Recorded Investment	124,188	133,831
Interest Income Recognized	222	1,657
Residential mortgage
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	69,599	68,336
Unpaid Principal Balance	75,409	74,088
Related Allowance	10,649	11,091
Average Recorded Investment	70,292	70,435
Interest Income Recognized	1,213	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	60,209	62,362
Unpaid Principal Balance	65,163	67,090
Related Allowance	10,649	11,091
Average Recorded Investment	60,831	63,825
Interest Income Recognized	1,112	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	9,390	5,974
Unpaid Principal Balance	10,246	6,998
Related Allowance	0	0
Average Recorded Investment	9,461	6,610
Interest Income Recognized	101	184
Home equity
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,467	20,757
Unpaid Principal Balance	23,450	22,912
Related Allowance	9,665	9,312
Average Recorded Investment	21,772	21,932
Interest Income Recognized	484	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	20,927	20,651
Unpaid Principal Balance	22,907	22,805
Related Allowance	9,665	9,312
Average Recorded Investment	21,232	21,825
Interest Income Recognized	484	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	540	106
Unpaid Principal Balance	543	107
Related Allowance	0	0
Average Recorded Investment	540	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	1,315	1,235
Unpaid Principal Balance	1,342	1,284
Related Allowance	229	186
Average Recorded Investment	1,335	1,294
Interest Income Recognized	12	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	1,315	1,235
Unpaid Principal Balance	1,342	1,284
Related Allowance	229	186
Average Recorded Investment	1,335	1,294
Interest Income Recognized	12	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	92,381	90,328
Unpaid Principal Balance	100,201	98,284
Related Allowance	20,543	20,589
Average Recorded Investment	93,399	93,661
Interest Income Recognized	1,709	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	82,451	84,248
Unpaid Principal Balance	89,412	91,179
Related Allowance	20,543	20,589
Average Recorded Investment	83,398	86,944
Interest Income Recognized	1,608	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	9,930	6,080
Unpaid Principal Balance	10,789	7,105
Related Allowance	0	0
Average Recorded Investment	10,001	6,717
Interest Income Recognized	$ 101	$ 188

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Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 77,325	$ 79,857
Nonaccrual Restructured Loans	51,715	29,385
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	31,540	31,884
Nonaccrual Restructured Loans	27,016	1,276
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	4,145	5,490
Nonaccrual Restructured Loans	2,145	2,220
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	14,628	15,289
Nonaccrual Restructured Loans	602	924
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	321	359
Nonaccrual Restructured Loans	164	150
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	17,624	18,100
Nonaccrual Restructured Loans	19,365	21,906
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,985	7,756
Nonaccrual Restructured Loans	2,401	2,877
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,082	979
Nonaccrual Restructured Loans	$ 22	$ 32

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Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	88	97
Recorded Investment	$ 35,020	$ 8,103
Unpaid Principal Balance	$ 56,700	$ 8,527
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	24	11
Recorded Investment	$ 30,935	$ 2,608
Unpaid Principal Balance	$ 52,260	$ 2,676
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	1
Recorded Investment	$ 716	$ 120
Unpaid Principal Balance	$ 716	$ 126
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	36	48
Recorded Investment	$ 2,695	$ 3,942
Unpaid Principal Balance	$ 2,805	$ 4,171
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	26	37
Recorded Investment	$ 674	$ 1,433
Unpaid Principal Balance	$ 919	$ 1,554

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Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) loan	Jun. 30, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	26	38
Recorded Investment | $	$ 1,212	$ 2,739
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	2
Recorded Investment | $	$ 0	$ 168
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	17	25
Recorded Investment | $	$ 941	$ 2,407
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	9	11
Recorded Investment | $	$ 271	$ 164

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Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 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	(27,230)	(86,439)
Recoveries	8,996	21,510
Net charge offs	(18,234)	(64,929)
Provision for loan losses	21,000	69,000
Balance at end of period	281,101	278,335
Allowance for loan losses:
Individually evaluated	17,826	24,103
Collectively evaluated	22,162	22,380
Total impaired loans	39,988	46,483
Collectively evaluated	241,113	231,852
Balance at end of period	281,101	278,335
Loans:
Individually evaluated	174,086	214,409
Collectively evaluated	135,127	140,751
Total impaired loans	309,213	355,160
Collectively evaluated	20,473,856	19,699,556
Total loans	20,783,069	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	(21,912)	(71,016)
Recoveries	6,498	14,543
Net charge offs	(15,414)	(56,473)
Provision for loan losses	18,295	66,640
Balance at end of period	143,007	140,126
Allowance for loan losses:
Individually evaluated	17,350	20,836
Collectively evaluated	532	781
Total impaired loans	17,882	21,617
Collectively evaluated	125,125	118,509
Balance at end of period	143,007	140,126
Loans:
Individually evaluated	140,061	180,965
Collectively evaluated	32,954	34,290
Total impaired loans	173,015	215,255
Collectively evaluated	6,397,985	6,273,759
Total loans	6,571,000	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	(83)	(512)
Recoveries	145	74
Net charge offs	62	(438)
Provision for loan losses	(5,551)	(4,208)
Balance at end of period	8,545	14,034
Allowance for loan losses:
Individually evaluated	187	0
Collectively evaluated	339	295
Total impaired loans	526	295
Collectively evaluated	8,019	13,739
Balance at end of period	8,545	14,034
Loans:
Individually evaluated	15,303	8,439
Collectively evaluated	4,642	6,595
Total impaired loans	19,945	15,034
Collectively evaluated	825,391	882,690
Total loans	845,336	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	(803)	(1,504)
Recoveries	163	1,624
Net charge offs	(640)	120
Provision for loan losses	(3,155)	2,147
Balance at end of period	41,490	45,285
Allowance for loan losses:
Individually evaluated	183	3,117
Collectively evaluated	147	424
Total impaired loans	330	3,541
Collectively evaluated	41,160	41,744
Balance at end of period	41,490	45,285
Loans:
Individually evaluated	6,799	17,322
Collectively evaluated	15,035	16,018
Total impaired loans	21,834	33,340
Collectively evaluated	3,307,751	3,541,392
Total loans	3,329,585	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	(62)	(558)
Recoveries	47	203
Net charge offs	(15)	(355)
Provision for loan losses	4,571	2,021
Balance at end of period	31,488	26,932
Allowance for loan losses:
Individually evaluated	0	0
Collectively evaluated	707	441
Total impaired loans	707	441
Collectively evaluated	30,781	26,491
Balance at end of period	31,488	26,932
Loans:
Individually evaluated	220	0
Collectively evaluated	1,818	1,203
Total impaired loans	2,038	1,203
Collectively evaluated	1,649,767	1,431,294
Total loans	1,651,805	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	(1,034)	(4,332)
Recoveries	342	755
Net charge offs	(692)	(3,577)
Provision for loan losses	5,212	2,362
Balance at end of period	31,566	27,046
Allowance for loan losses:
Individually evaluated	106	147
Collectively evaluated	10,543	10,944
Total impaired loans	10,649	11,091
Collectively evaluated	20,917	15,955
Balance at end of period	31,566	27,046
Loans:
Individually evaluated	11,060	7,033
Collectively evaluated	58,539	61,303
Total impaired loans	69,599	68,336
Collectively evaluated	7,045,858	6,263,991
Total loans	7,115,457	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	(1,196)	(4,686)
Recoveries	1,423	3,491
Net charge offs	227	(1,195)
Provision for loan losses	(351)	(1,996)
Balance at end of period	20,240	20,364
Allowance for loan losses:
Individually evaluated	0	3
Collectively evaluated	9,665	9,309
Total impaired loans	9,665	9,312
Collectively evaluated	10,575	11,052
Balance at end of period	20,240	20,364
Loans:
Individually evaluated	643	650
Collectively evaluated	20,824	20,107
Total impaired loans	21,467	20,757
Collectively evaluated	875,644	913,686
Total loans	897,111	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	(2,140)	(3,831)
Recoveries	378	820
Net charge offs	(1,762)	(3,011)
Provision for loan losses	1,979	2,034
Balance at end of period	4,765	4,548
Allowance for loan losses:
Individually evaluated	0	0
Collectively evaluated	229	186
Total impaired loans	229	186
Collectively evaluated	4,536	4,362
Balance at end of period	4,765	4,548
Loans:
Individually evaluated	0	0
Collectively evaluated	1,315	1,235
Total impaired loans	1,315	1,235
Collectively evaluated	371,460	392,744
Total loans	$ 372,775	$ 393,979

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Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Change in the allowance for unfunded commitments
Balance at beginning of period	$ 25,000
Balance at end of period	25,000	$ 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	0	1,000
Balance at end of period	$ 25,400	$ 25,400

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Loans (Details Textuals) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 35,020	$ 8,103
Restructured Loans Subsequently Accruing	6,000
Ytd Restructured Loans Still On Nonaccrual	$ 29,000

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Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Summary of core deposit intangibles and other intangibles
Additions during the period		$ 162		$ 1,000
Amortization of other intangible assets	$ 496		$ 539		$ 1,009	$ 1,043
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	4,385				4,385		$ 4,385
Accumulated amortization	(4,385)				(4,385)		(4,273)
Total Estimated Amortization Expense	0				0		112
Amortization of other intangible assets					112		281
Other Intangible Assets
Summary of core deposit intangibles and other intangibles
Gross carrying amount	32,572				32,572		32,410
Accumulated amortization	(18,042)				(18,042)		(17,145)
Total Estimated Amortization Expense	$ 14,530				14,530		15,265
Additions during the period					162		1,012
Amortization of other intangible assets					$ 897		$ 1,812

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Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Mortgage servicing rights:
Mortgage servicing rights at beginning of period		$ 62,085	$ 62,150
Additions		3,278	12,262
Amortization		(5,084)	(12,327)
Mortgage servicing rights at end of period		60,279	62,085
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period		(609)	(809)
(Additions) recoveries, net		(275)	200
Valuation allowance at end of period		(884)	(609)
Mortgage servicing rights, net		59,395	61,476
Fair value of mortgage servicing rights		64,627	73,149
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)		$ 7,768,374	$ 7,974,742
Mortgage servicing rights, net to servicing portfolio		0.76%	0.77%
Mortgage servicing rights expense	[1]	$ 5,359	$ 12,127

[1] (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.

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Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Core Deposit Intangibles
Estimated future amortization expense
Total Estimated Amortization Expense	$ 0	$ 112
Other Intangible Assets
Estimated future amortization expense
Six months ending December 31, 2017	901
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	6,392
Total Estimated Amortization Expense	14,530	$ 15,265
Mortgage Servicing Rights
Estimated future amortization expense
Six months ending December 31, 2017	5,046
Year ending December 31, 2018	8,897
Year ending December 31, 2019	7,476
Year ending December 31, 2020	6,292
Year ending December 31, 2021	5,315
Year ending December 31, 2022	4,515
Beyond 2022	22,738
Total Estimated Amortization Expense	$ 60,279

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Goodwill and Other Intangible Assets (Details Textuals)	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) acquisition	Mar. 31, 2016 USD ($) acquisition	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill acquired during period	$ 55,000	$ 3,000,000
Additions to finite-lived intangible assets	$ 162,000	$ 1,000,000
Number of Acquisitions | acquisition	1	2
Goodwill			$ 972,006,000	$ 971,951,000
Goodwill, Impairment Loss			$ 0	$ 0

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Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Short-term Funding [Abstract]
Federal funds purchased	$ 345,350	$ 208,150
Securities sold under agreements to repurchase	262,319	300,197
Federal funds purchased and securities sold under agreements to repurchase	607,669	508,347
FHLB advances	697,000	482,000
Commercial paper	97,813	101,688
Other short-term funding	794,813	583,688
Total short-term funding	1,402,482	1,092,035
Long-term Funding
FHLB advances	2,765,176	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	(3,056)	(3,393)
Total long-term funding	3,262,120	2,761,795
Total short and long-term funding	$ 4,664,602	$ 3,853,830

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Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 262,319	$ 300,197
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	262,319	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	262,319	300,197
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	262,319	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

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Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2014	Jun. 30, 2017	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed		$ 381
Federal Home Loan Bank, Advances, Weighted Average Interest Rate		0.98%	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%

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Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Trading assets | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 2,118,409	$ 2,039,323
Fair Value	28,105	33,671
Trading assets | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	93,300	109,675
Fair Value	1,480	2,002
Trading assets | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	304,554	127,582
Fair Value	18,991	16,725
Trading liabilities | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,118,409	2,039,323
Fair Value	(27,691)	(33,188)
Trading liabilities | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	92,969	106,251
Fair Value	(1,412)	(1,943)
Trading liabilities | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	303,790	128,368
Fair Value	(18,040)	(15,972)
Other assets | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	356,798	285,345
Fair Value	2,680	206
Other assets | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	151,500	179,600
Fair Value	159	2,908
Other assets | Purchased options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	75,899	80,554
Fair Value	1,531	2,576
Other liabilities | Written options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	75,899	80,554
Fair Value	$ (1,531)	$ (2,576)

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Derivative and Hedging Activities, Income Statement Category of the Gains and Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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	$ (69)	$ (1,426)
Capital market fees, net | Foreign currency exchange forwards
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	9	(48)
Capital market fees, net | Commodity contracts
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	198	358
Mortgage banking, net | Interest rate lock commitments (mortgage)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	2,474	3,312
Mortgage banking, net | Forward commitments (mortgage)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ (2,749)	$ (4,608)

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Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 22	$ 40
Derivative collateral right to reclaim cash	$ 1	$ 0

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Balance Sheet Offsetting (Details) - Interest and commodity agreements - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 24,322	$ 18,031
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	24,322	18,031
Financial instruments	(16,517)	(18,031)
Collateral	(7,805)	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	16,517	31,075
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	16,517	31,075
Financial instruments	(16,517)	(18,031)
Collateral	0	(11,148)
Net amount	$ 0	$ 1,896

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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 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	8,063,899	8,131,131
Commercial Letters Of Credit
Summary of lending-related and other commitments
Lending related commitments	5,839	7,923
Standby Letters of Credit
Summary of lending-related and other commitments
Lending related commitments	242,144	259,632
Standby letters of credit, fair value	$ 2,000	$ 3,000

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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters Residential Mortgage Repurchase Reserve (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Residential mortgage repurchase reserve
Balance at beginning of period	$ 25,000
Balance at end of period	25,000	$ 25,000
Mortgage Repurchase Reserve
Residential mortgage repurchase reserve
Balance at beginning of period	900	1,197
Repurchase provision expense	109	456
Adjustments to provision expense	0	(750)
Charge offs, net	(18)	(3)
Balance at end of period	$ 991	$ 900

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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) $ in Thousands	Jan. 11, 2016 USD ($) complaint	May 22, 2015 USD ($) branch loan_production_office	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
unfunded commitments			$ 25,000	$ 25,000
Carrying value of investments			114,000	85,000
Commitments under unconsolidated projects			84,000	69,000
Number of complaints filed under legal proceedings | complaint	2
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
Loans repurchased under make whole requests			367	2,000
Loans sold to outside investors original amount			9,500,000
Loans sold to outside investors remaining outstanding amount			6,100,000
Residential mortgage loans sold with recourse risk			74,000	62,000
Residential mortgage loans sold with credit recourse risk			$ 85,000	$ 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

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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment securities available for sale:
Investment securities available for sale	$ 3,687,470	$ 4,680,226
Trading assets	48,576	52,398
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	47,143	51,103
Fair Value, Inputs, Level 1
Investment securities available for sale:
Investment securities available for sale	2,636	2,602
Fair Value, Inputs, Level 2
Investment securities available for sale:
Investment securities available for sale	3,684,834	4,677,424
Trading assets	50,107	54,974
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	48,674	53,679
Fair Value, Inputs, Level 3
Investment securities available for sale:
Investment securities available for sale	0	200
Trading assets	2,839	3,114
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities
Investment securities available for sale:
Investment securities available for sale	1,002	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	1,634	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	2,636	2,602
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Investment securities available for sale:
Investment securities available for sale	546,525	639,930
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA
Investment securities available for sale:
Investment securities available for sale	1,714,178	2,004,475
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private Label
Investment securities available for sale:
Investment securities available for sale	1,086	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	1,419,872	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	3,173	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	3,684,834	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	41,620	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror
Investment securities available for sale:
Trading assets	28,105	33,671
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	27,691	33,188
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Investment securities available for sale:
Trading assets	1,480	2,002
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,412	1,943
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Investment securities available for sale:
Trading assets	18,991	16,725
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	18,040	15,972
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)
Investment securities available for sale:
Trading assets	1,531	2,576
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,531	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	2,680	206
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Investment securities available for sale:
Trading assets	$ 159	$ 2,908

XML

Fair Value Measurements, Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 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	[1]	(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	[1]	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		(275)	1,753
Ending Balance		$ 2,839	$ 3,114

[1] (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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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 59,395		$ 61,476
Mortgage Servicing Rights (MSR) Impairment (Recovery)	275	$ 2,120
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	4,772		12,474
Residential Held-for-sale, Fair Value Disclosure	41,620		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	4,772		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	1,999		9,752
Foreclosure / OREO expense, net	(621)		(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	74,937		79,270
Provision for Credit Losses, Impaired Loans	(16,462)		(75,194)
Mortgage servicing rights	64,627		73,149
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ (275)		$ 200

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Fair Value Measurements Fair Value Unobservable Level 3 Measurements (Details) - Fair Value, Inputs, Level 3	6 Months Ended
	Jun. 30, 2017
Discounted Cash Flow | Servicing Contracts
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	11.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	11.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	20.00%

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Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financial assets
Cash and due from banks	$ 396,677	$ 446,558
Interest-bearing deposits in other financial institutions	126,232	149,175
Federal funds sold and securities purchased under agreements to resell	43,000	46,500
Investment securities held to maturity	2,255,395	1,273,536
Investment securities held to maturity, fair value	2,263,322	1,264,674
Investment securities available for sale	3,687,470	4,680,226
FHLB and Federal Reserve Bank stocks	181,180	140,001
Commercial loans held for sale	4,772	12,474
Loans, net	20,501,968	19,776,381
Derivatives (trading and other assets)	48,576	52,398
Financial liabilities
Short-term funding	1,402,482	1,092,035
Long-term funding	3,262,120	2,761,795
Derivatives (trading and other liabilities)	47,143	51,103
Letters of Credit Outstanding, Amount	242,000	260,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	396,677	446,558
Cash and due from banks, Fair Value	396,677	446,558
Interest-bearing deposits in other financial institutions	126,232	149,175
Interest-bearing deposits in other financial institutions, fair value	126,232	149,175
Federal funds sold and securities purchased under agreements to resell	43,000	46,500
Federal funds sold and securities purchased under agreements to resell, fair value	43,000	46,500
Investment securities available for sale	2,636	2,602
Investment securities available for sale, at fair value	2,636	2,602
Fair Value, Inputs, Level 2
Financial assets
Investment securities held to maturity	2,255,395	1,273,536
Investment securities held to maturity, fair value	2,263,322	1,264,674
Investment securities available for sale	3,684,834	4,677,424
Investment securities available for sale, at fair value	3,684,834	4,677,424
FHLB and Federal Reserve Bank stocks	181,180	140,001
Federal Home Loan Bank and Federal Reserve Bank stocks, fair value	181,180	140,001
Commercial loans held for sale	4,772	12,474
Commercial Loans Held-for-sale, Fair Value Disclosure	4,772	12,474
Residential Loans on Real Estate, Carrying Amount of Mortgages	41,620	108,010
Residential Held-for-sale, Fair Value Disclosure	41,620	108,010
Bank owned life insurance	588,440	585,290
Bank owned life insurance, fair value	588,440	585,290
Derivatives (trading and other assets)	50,107	54,974
Derivatives (trading and other assets), fair value	50,107	54,974
Financial liabilities
Brokered CDs and other time deposits	1,940,330	1,606,127
Brokered CDs and other time deposits, fair value	1,940,330	1,606,127
Short-term funding	1,402,482	1,092,035
Short-term funding, fair value	1,402,482	1,092,035
Long-term funding	3,262,120	2,761,795
Long-term funding, fair value	3,288,139	2,791,841
Standby letters of credit	2,394	2,566
Standby letters of credit, fair value	2,394	2,566
Derivatives (trading and other liabilities)	48,674	53,679
Derivatives (trading and other liabilities), fair value	48,674	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	20,501,968	19,776,381
Loans, net, fair value	20,377,586	19,680,317
Derivatives (trading and other assets)	2,839	3,114
Derivatives (trading and other assets), fair value	2,839	3,114
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	19,677,850	20,282,321
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	$ 19,677,850	$ 20,282,321

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Fair Value Measurements (Details Textuals)	6 Months Ended
	Jun. 30, 2017
Fair Value of Assets and Liabilities [Line Items]
Closing ratio	88.00%

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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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension Plan:
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,782	$ 1,725	$ 3,563	$ 3,450
Interest cost	1,756	1,780	3,512	3,560
Expected return on plan assets	(4,882)	(5,065)	(9,763)	(10,130)
Amortization of prior service cost	(18)	12	(37)	25
Amortization of actuarial loss	487	483	975	965
Total net pension and periodic benefit cost	(875)	(1,065)	(1,750)	(2,130)
Postretirement Plan:
Net period benefit cost for the pension and postretirement plans
Interest cost	24	36	48	72
Amortization of prior service cost	(19)	0	(38)	0
Total net pension and periodic benefit cost	$ 5	$ 36	$ 10	$ 72

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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Income Statement Data Abstract
Net interest income	$ 183,819	$ 176,717	$ 364,093	$ 348,704
Noninterest income	82,410	82,168	162,241	165,360
Total revenue	266,229	258,885	526,334	514,064
Credit provision	12,000	14,000	21,000	34,000
Noninterest expense	176,316	174,360	350,007	348,331
Income (loss) before income taxes	77,913	70,525	155,327	131,733
Income tax expense (benefit)	19,930	21,434	41,074	40,108
Net income	$ 57,983	$ 49,091	$ 114,253	$ 91,625
Return on average allocated capital (ROCET1)	10.60%	9.90%	10.60%	9.20%
Segment Balance Sheet Data
Average earning assets	$ 26,744,555	$ 25,968,049	$ 26,543,054	$ 25,620,211
Average loans	20,521,990	19,641,985	20,298,599	19,282,408
Average deposits	21,523,149	20,288,953	21,494,594	20,431,966
Average allocated capital (CET1)	2,099,825	1,913,241	2,080,892	1,904,861
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	89,871	80,069	179,259	159,233
Noninterest income	12,497	10,936	24,490	22,549
Total revenue	102,368	91,005	203,749	181,782
Credit provision	11,470	15,114	23,050	27,853
Noninterest expense	39,418	37,140	76,897	71,543
Income (loss) before income taxes	51,480	38,751	103,802	82,386
Income tax expense (benefit)	16,363	13,137	34,012	27,716
Net income	$ 35,117	$ 25,614	$ 69,790	$ 54,670
Return on average allocated capital (ROCET1)	12.50%	9.70%	12.60%	10.50%
Segment Balance Sheet Data
Average earning assets	$ 10,853,881	$ 10,128,726	$ 10,807,106	$ 9,924,378
Average loans	10,841,858	10,115,959	10,797,831	9,913,591
Average deposits	6,447,190	5,570,919	6,433,870	5,744,533
Average allocated capital (CET1)	1,125,494	1,067,203	1,120,082	1,049,431
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	90,131	84,969	179,059	170,574
Noninterest income	65,809	65,132	130,679	128,880
Total revenue	155,940	150,101	309,738	299,454
Credit provision	5,764	6,246	10,271	12,388
Noninterest expense	125,242	121,965	241,339	243,260
Income (loss) before income taxes	24,934	21,890	58,128	43,806
Income tax expense (benefit)	8,727	7,662	20,345	15,332
Net income	$ 16,207	$ 14,228	$ 37,783	$ 28,474
Return on average allocated capital (ROCET1)	11.00%	9.00%	13.10%	9.10%
Segment Balance Sheet Data
Average earning assets	$ 9,510,571	$ 9,325,036	$ 9,321,564	$ 9,222,677
Average loans	9,508,683	9,323,720	9,319,719	9,221,370
Average deposits	11,574,028	11,331,214	11,456,200	11,215,704
Average allocated capital (CET1)	588,880	633,829	582,706	630,520
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	3,817	11,679	5,775	18,897
Noninterest income	4,104	6,100	7,072	13,931
Total revenue	7,921	17,779	12,847	32,828
Credit provision	(5,234)	(7,360)	(12,321)	(6,241)
Noninterest expense	11,656	15,255	31,771	33,528
Income (loss) before income taxes	1,499	9,884	(6,603)	5,541
Income tax expense (benefit)	(5,160)	635	(13,283)	(2,940)
Net income	$ 6,659	$ 9,249	$ 6,680	$ 8,481
Return on average allocated capital (ROCET1)	4.50%	13.40%	1.10%	3.70%
Segment Balance Sheet Data
Average earning assets	$ 6,380,103	$ 6,514,287	$ 6,414,384	$ 6,473,156
Average loans	171,449	202,306	181,049	147,447
Average deposits	3,501,931	3,386,820	3,604,524	3,471,729
Average allocated capital (CET1)	$ 385,451	$ 212,209	$ 378,104	$ 224,910

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (54,679)
Personnel expense	$ (104,683)	$ (102,129)	(209,102)	$ (203,527)
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,548)	(1,452)	(2,575)	(3,024)
Total other comprehensive income	2,874	11,286	1,209	46,069
Ending Balance	(53,470)		(53,470)
Investments Securities Available For Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(22,023)	34,936	(20,079)	459
Other comprehensive income (loss) before reclassifications	5,744	22,321	3,632	82,743
Investment securities gain, net		(3,116)		(6,214)
Personnel expense	0	0	0	0
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,548)	(1,452)	(2,575)	(3,024)
Income tax (expense) benefit	(1,601)	(6,773)	(406)	(28,048)
Total other comprehensive income	2,595	10,980	651	45,457
Ending Balance	(19,428)	45,916	(19,428)	45,916
Defined Benefit Pension and Post Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(34,321)	(32,769)	(34,600)	(33,075)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Investment securities gain, net		0		0
Personnel expense	450	495	900	990
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	0	0	0	0
Income tax (expense) benefit	(171)	(189)	(342)	(378)
Total other comprehensive income	279	306	558	612
Ending Balance	(34,042)	(32,463)	(34,042)	(32,463)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(56,344)	2,167	(54,679)	(32,616)
Other comprehensive income (loss) before reclassifications	5,744	22,321	3,632	82,743
Investment securities gain, net		(3,116)		(6,214)
Personnel expense	450	495	900	990
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,548)	(1,452)	(2,575)	(3,024)
Income tax (expense) benefit	(1,772)	(6,962)	(748)	(28,426)
Total other comprehensive income	2,874	11,286	1,209	46,069
Ending Balance	$ (53,470)	$ 13,453	$ (53,470)	$ 13,453

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Recent Developments (Details) - Bank Mutual Corporation - USD ($) $ in Millions	Jul. 20, 2017	Jun. 30, 2017
Subsequent Event [Line Items]
Assets acquired		$ 2,700
Deposits acquired		$ 1,900
Subsequent Event
Subsequent Event [Line Items]
Consideration transfered (in shares per share)	0.4220
Transaction value of merger	$ 482