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, 2018

¨	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, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth 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)
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. ¨

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

Yes  ¨        No  þ

APPLICABLE ONLY TO CORPORATE ISSUERS:

The number of shares outstanding of registrant’s common stock, par value $0.01 per share, at July 25, 2018 was 172,093,888.

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	9
	Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	55
	Item 3. Quantitative and Qualitative Disclosures About Market Risk	82
	Item 4. Controls and Procedures	82
PART II. Other Information
	Item 1. Legal Proceedings	83
	Item 1A. Risk Factors	83
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	83
	Item 6. Exhibits	84
	Signatures	85

2

PART I - FINANCIAL INFORMATION
ITEM 1.	Financial Statements:

ASSOCIATED BANC-CORP

Consolidated Balance Sheets

	June 30, 2018			December 31, 2017
	(Unaudited)			(Audited)
	(In Thousands, except share and per share data)
Assets
Cash and due from banks	$	396,761		$	483,666
Interest-bearing deposits in other financial institutions	71,462			199,702
Federal funds sold and securities purchased under agreements to resell	3,150			32,650
Investment securities held to maturity, at amortized cost	2,602,247			2,282,853
Investment securities available for sale, at fair value	4,261,651			4,043,446
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	249,040			165,331
Residential loans held for sale	143,022			85,544
Loans	22,976,786			20,784,991
Allowance for loan losses	(252,601		)	(265,880		)
Loans, net	22,724,184			20,519,111
Bank and corporate owned life insurance	659,592			591,057
Tax credit and other investments	137,051			147,099
Trading assets	132,919			69,675
Premises and equipment, net	361,385			330,963
Goodwill	1,166,665			976,239
Mortgage servicing rights, net	66,980			58,384
Other intangible assets, net	80,346			15,580
Other assets	596,190			482,294
Total assets	$	33,652,647		$	30,483,594
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	$	5,341,361		$	5,478,416
Interest-bearing deposits	18,474,953			17,307,546
Total deposits	23,816,314			22,785,962
Federal funds purchased and securities sold under agreements to repurchase	203,733			324,815
Commercial paper	52,791			67,467
FHLB advances	4,797,857			3,184,168
Other long-term funding	497,619			497,282
Trading liabilities	131,612			67,660
Accrued expenses and other liabilities	382,476			318,797
Total liabilities	29,882,403			27,246,151
Stockholders’ Equity
Preferred equity	159,401			159,929
Common equity
Common stock	1,751			1,618
Surplus	1,828,965			1,454,188
Retained earnings	1,920,579			1,819,230
Accumulated other comprehensive income (loss)	(119,888		)	(62,758		)
Treasury stock, at cost	(20,564		)	(134,764		)
Total common equity	3,610,843			3,077,514
Total stockholders’ equity	3,770,244			3,237,443
Total liabilities and stockholders’ equity	$	33,652,647		$	30,483,594
Preferred shares issued	164,570			165,000
Preferred shares authorized (par value $1.00 per share)	750,000			750,000
Common shares issued	175,133,157			161,751,975
Common shares authorized (par value $0.01 per share)	250,000,000			250,000,000
Treasury shares of common stock	1,606,672			8,908,448

Numbers may not sum due to rounding.

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,
	2018			2017			2018			2017
	(In Thousands, except per share data)
Interest Income
Interest and fees on loans	$	246,646		$	184,246		$	466,680		$	357,895
Interest and dividends on investment securities:
Taxable	30,623			23,658			60,727			47,133
Tax-exempt	10,783			8,143			20,000			16,272
Other interest	3,153			1,553			5,330			3,089
Total interest income	291,205			217,600			552,737			424,389
Interest Expense
Interest on deposits	38,431			21,180			71,843			38,104
Interest on Federal funds purchased and securities sold under agreements to repurchase	538			824			1,060			1,339
Interest on other short-term funding	51			84			111			169
Interest on FHLB advances	21,279			7,149			34,402			11,596
Interest on long-term funding	4,544			4,544			9,088			9,088
Total interest expense	64,843			33,781			116,504			60,296
Net Interest Income	226,362			183,819			436,233			364,093
Provision for credit losses	4,000			12,000			4,000			21,000
Net interest income after provision for credit losses	222,362			171,819			432,233			343,093
Noninterest Income
Insurance commissions and fees	23,996			20,853			46,644			42,473
Service charges on deposit account fees	16,390			16,030			32,810			32,386
Card-based and loan fees	14,387			13,764			27,809			26,229
Trust and asset management fees	13,437			12,346			26,806			24,281
Brokerage commission and fees	6,896			4,346			14,169			8,679
Mortgage banking, net	6,258			5,027			12,628			9,606
Capital markets, net	4,783			4,042			10,089			7,925
Bank and corporate owned life insurance	3,978			3,899			7,165			6,514
Asset gains (losses), net	2,497			(466		)	2,390			(700		)
Investment securities gains (losses), net	(2,015		)	356			(2,015		)	356
Other	2,235			2,213			4,727			4,492
Total noninterest income	92,842			82,410			183,222			162,241
Noninterest Expense
Personnel	123,980			107,066			241,665			213,848
Occupancy	15,071			12,832			30,428			28,051
Technology	19,452			15,473			37,167			29,893
Equipment	5,953			5,234			11,509			10,719
Business development and advertising	7,067			7,152			13,760			12,987
Legal and professional	6,284			5,711			11,697			9,877
Card issuance and loan costs	3,173			2,974			6,477			5,594
Foreclosure / OREO expense, net	1,021			1,182			1,744			2,687
FDIC assessment	8,250			8,000			16,500			16,000
Other intangible amortization	2,168			496			3,693			1,009
Acquisition related costs(a)	7,107			—			27,712			—
Other	11,732			10,196			21,873			19,342
Total noninterest expense	211,258			176,316			424,223			350,007
Income before income taxes	103,947			77,913			191,232			155,327
Income tax expense	14,754			19,930			32,583			41,074
Net Income	89,192			57,983			158,648			114,253
Preferred stock dividends	2,329			2,339			4,668			4,669
Net income available to common equity	$	86,863		$	55,644		$	153,980		$	109,584
Earnings per common share:
Basic	$	0.51		$	0.36		$	0.92		$	0.72
Diluted	$	0.50		$	0.36		$	0.90		$	0.71
Average common shares outstanding:
Basic	170,633			151,573			167,096			151,196
Diluted	173,409			154,302			169,920			154,147

Numbers may not sum due to rounding.

(a) Includes Bank Mutual acquisition-related costs only.

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,
	2018			2017			2018			2017
	($ in Thousands)
Net income	$	89,192		$	57,983		$	158,648		$	114,253
Other comprehensive income, net of tax
Investment securities available for sale
Net unrealized gains (losses)	(18,919		)	15,218			(60,754		)	18,370
Net unrealized gain (loss) on available for sale securities transferred to held to maturity securities	—			(9,474		)	—			(14,738		)
Amortization of net unrealized gain (loss) on available for sale securities transferred to held to maturity securities	(335		)	(1,548		)	(632		)	(2,575		)
Reclassification adjustment for net losses (gains) realized in net income(1)	2,015			—			2,015			—
Reclassification from OCI due to change in accounting principle	—			—			(84		)	—
Reclassification of certain tax effects from OCI	—			—			(8,419		)	—
Income tax (expense) benefit	4,705			(1,601		)	15,340			(406		)
Other comprehensive income (loss) on investment securities available for sale	(12,533		)	2,595			(52,533		)	651
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(38		)	(37		)	(76		)	(75		)
Amortization of actuarial loss (gains)	465			487			929			975
Reclassification of certain tax effects from OCI	—			—			(5,235		)	—
Income tax (expense) benefit	(109		)	(171		)	(216		)	(342		)
Other comprehensive income (loss) on pension and postretirement obligations	318			279			(4,597		)	558
Total other comprehensive income (loss)	(12,215		)	2,874			(57,130		)	1,209
Comprehensive income	$	76,977		$	60,857		$	101,518		$	115,462

Numbers may not sum due to rounding.

(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, 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
Balance, December 31, 2017	$	159,929		$	1,618		$	1,454,188		$	1,819,230		$	(62,758	)	$	(134,764	)	$	3,237,443
Comprehensive income
Net income	—			—			—			158,648			—			—			158,648
Other comprehensive income	—			—			—			—			(43,392		)	—			(43,392		)
Adoption of new accounting standards	—			—			—			—			(13,738		)	—			(13,738		)
Comprehensive income																			101,518
Common stock issued
Stock-based compensation plans, net	—			—			2,702			(15,176		)	—			28,621			16,147
Acquisitions	—			137			396,975			—			—			91,296			488,408
Purchase of common stock returned to authorized but unissued				(14		)	(33,061		)	—			—			—			(33,075		)
Purchase of treasury stock	—			—			—			—			—			(5,717		)	(5,717		)
Cash dividends
Common stock, $0.30 per share	—			—			—			(51,817		)	—			—			(51,817		)
Preferred stock	—			—			—			(4,668		)	—			—			(4,668		)
Redemption of preferred stock	(528		)	—			—			(118		)	—			—			(646		)
Common stock warrants exercised	—			10			(10		)	—			—			—			—
Stock-based compensation expense, net	—			—			8,172			—			—			—			8,172
Tax Act reclassification	—			—			—			13,654						—			13,654
Change in accounting principle	—			—			—			84						—			84
Other	—			—			—			742			—			—			742
Balance, June 30, 2018	$	159,401		$	1,751		$	1,828,965		$	1,920,579		$	(119,888	)	$	(20,564	)	$	3,770,244

Numbers may not sum due to rounding.

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,
	2018			2017
	($ in Thousands)
Cash Flow From Operating Activities
Net income	$	158,648		$	114,253
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	4,000			21,000
Depreciation and amortization	24,249			23,241
Addition to (recovery of) valuation allowance on mortgage servicing rights, net	(607		)	275
Amortization of mortgage servicing rights	4,649			5,084
Amortization of other intangible assets	3,693			1,009
Amortization and accretion on earning assets, funding, and other, net	423			17,889
Net amortization of tax credit investments	9,770			5,165
Gain on sales of investment securities, net	2,015			(356		)
Asset (gains) losses, net	(2,390		)	700
(Gain) loss on mortgage banking activities, net	261			4,287
Mortgage loans originated and acquired for sale	(516,285		)	(220,284		)
Proceeds from sales of mortgage loans held for sale	482,080			364,128
Pension Contribution	(31,371		)	—
(Increase) decrease in interest receivable	(14,569		)	(757		)
Increase (decrease) in interest payable	3,775			2,653
Net change in other assets and other liabilities	(11,807		)	(18,849		)
Net cash provided by operating activities	116,534			319,438
Cash Flow From Investing Activities
Net increase in loans	(338,781		)	(819,198		)
Purchases of
Available for sale securities	(655,949		)	(417,397		)
Held to maturity securities	(429,964		)	(70,969		)
Federal Home Loan Bank and Federal Reserve Bank stocks	(238,190		)	(166,869		)
Premises, equipment, and software, net of disposals	(23,932		)	(19,289		)
Proceeds from
Sales of available for sale securities	493,060			—
Sales of held to maturity securities	—			16,059
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks	174,506			125,690
Prepayments, calls, and maturities of available for sale investment securities	330,517			389,251
Prepayments, calls, and maturities of held to maturity investment securities	121,612			80,976
Sales, prepayments, calls, and maturities of other assets	9,640			5,840
Net change in tax credit investments	(18,842		)	(30,833		)
Net cash (paid) received in acquisition	59,472			(217		)
Net cash used in investing activities	(516,851		)	(906,956		)
Cash Flow From Financing Activities
Net increase (decrease) in deposits	(810,598		)	(270,268		)
Net increase (decrease) in short-term funding	(481,920		)	95,447
Net increase (decrease) in FHLB advances	1,527,966			714,988
Proceeds from issuance of common stock for stock-based compensation plans	16,147			20,945
Redemption of preferred shares	(646		)	—
Purchase of common stock returned to authorized but unissued	(33,075		)	—
Purchase of treasury stock for tax withholding	(5,717		)	(8,445		)
Cash dividends on common stock	(51,817		)	(36,804		)
Cash dividends on preferred stock	(4,668		)	(4,669		)
Net cash provided by financing activities	155,672			511,194
Net increase (decrease) in cash, cash equivalents, and restricted cash	(244,645		)	(76,324		)
Cash, cash equivalents, and restricted cash at beginning of period	716,018			642,233
Cash, cash equivalents, and restricted cash at end of period	$	471,373		$	565,909
Supplemental disclosures of cash flow information
Cash paid for interest	$	112,392		$	57,306
Cash paid for income taxes	12,674			27,461
Loans and bank premises transferred to other real estate owned	21,299			3,267
Capitalized mortgage servicing rights	4,502			3,278
Loans transferred into held for sale from portfolio, net	12,709			66,181
Unsettled trades to purchase securities	15,339			—
Acquisition
Fair value of assets acquired, including cash and cash equivalents	2,569,700			—
Fair value ascribed to goodwill and intangible assets	258,885			217
Fair value of liabilities assumed	2,828,448			—
Common stock issued in acquisition	137			—

Numbers may not sum due to rounding.

See accompanying notes to consolidated financial statements.

7

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the statement of financial position that sum to the total of the same sum amounts shown in the statement of cash flows.

	Six Months Ended June 30,
	2018		2017
	($ in Thousands)
Cash and cash equivalents	$	385,957	$	466,996
Restricted cash	85,416		98,913
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	471,373	$	565,909

Amounts included in restricted cash represent required reserve balances with the Federal Reserve Bank, included in cash and due from banks on the face of the Consolidated Balance Sheet, and cash collateral for public fund customers, included in interest-bearing deposits in other financial institutions on the face of the Consolidated Balance Sheet.

8

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 Associated Banc-Corp's 2017 Annual Report on Form 10-K, should be referred to in connection with the reading of these unaudited interim financial statements.

Note 1 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.

Within the tables presented, certain columns and rows may not sum due to the use of rounded numbers for disclosure purposes.

Note 2 Acquisitions

Bank Mutual Acquisition

On February 1, 2018, the Corporation completed its acquisition of Bank Mutual Corporation ("Bank Mutual") in a stock transaction valued at approximately $482 million. Bank Mutual was a diversified financial services company headquartered in Milwaukee, Wisconsin. The merger resulted in a combined company with a larger market presence in markets the Corporation currently operates in, as well as expansion into nearly a dozen new markets. The merger is also expected to provide significant efficiency opportunities and economies of scale associated with a larger financial institution.

Under the terms of the Agreement and Plan of Merger dated July 20, 2017 (the "Merger Agreement"), Bank Mutual’s shareholders received 0.422 shares of the Corporation's common stock for each share of Bank Mutual common stock. The Corporation issued approximately 19.5 million shares for a total deal value of approximately $482 million based on the closing sale price of a share of common stock of the Corporation on January 31, 2018. The Corporation completed the conversion of Bank Mutual in the second quarter of 2018. The banking subsidiary of Bank Mutual merged with and into Associated Bank, N.A. on June 24, 2018.

The acquisition of Bank Mutual constituted a business combination. The merger has been accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair value on the acquisition date. The determination of estimated fair values required management to make certain estimates that are subjective in nature and may require adjustments upon the availability of new information regarding facts and circumstances which existed at the date of acquisition (i.e., appraisals) for up to a year following the acquisition. The Corporation continues to review information relating to events or circumstances existing at the acquisition date. Management anticipates that this review could result in adjustments to the acquisition date valuation amounts presented herein but does not anticipate that these adjustments will be material.

Goodwill related to the Bank Mutual acquisition increased $6 million during the second quarter of 2018 to $173 million. Upon review of information relating to events and circumstances existing at the acquisition date, and in accordance with applicable accounting guidance, the Corporation remeasured select previously reported fair value amounts. Based on updated appraisal information, the fair value of premises and equipment decreased by $6 million and the fair value of other real estate owned increased by $1 million. Additionally, the fair value of loans was increased by less than $1 million due to an updated appraisal and other adjustments. Goodwill created by the acquisition of Bank Mutual is not tax deductible. See Note 8 for additional information on goodwill, as well as the carrying amount and amortization of core deposit and other intangible assets related to the Bank Mutual acquisition.

9

The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Bank Mutual.

	Purchase Accounting Adjustments			February 1, 2018
	($ in Thousands)
Assets
Cash and cash equivalents	$	—		$	78,052
Investment securities	(6,238		)	452,867
Federal Home Loan Bank stock, at cost	—			20,026
Loans	(48,043		)	1,875,877
Premises and equipment, net	5,180			44,939
Bank owned life insurance	(24		)	65,390
Goodwill				173,243
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet)	58,100			58,100
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet)	989			5,638
Others assets	$	6,153		$	46,257
Total assets				$	2,820,389
Liabilities
Deposits	$	2,498		$	1,840,950
Other borrowings	1,875			431,886
Other liabilities	$	4,370		$	65,864
Total liabilities				$	2,338,701
Total consideration paid				$	481,688

The following is a description of the methods used to determine the fair value of significant assets and liabilities presented on the balance sheet above.

Loans: Fair values for loans were based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan, amortization status and current discount rates. Loans were grouped together according to similar characteristics when applying various valuation techniques.

Core deposit intangible ("CDI"): This intangible asset represents the value of the relationships with deposit customers. The fair value was estimated based on a discounted cash flow methodology that gave appropriate consideration to expected customer attrition rates, net maintenance cost of the deposit base, alternative cost of funds, and the interest costs associated with customer deposits. The CDI is being amortized on a straight-line basis over 10 years.

Time deposits: The fair values for time deposits are estimated using a discounted cash flow calculation that applies interest rates currently being offered to the contractual interest rates on such time deposits.

Federal Home Loan Bank ("FHLB") borrowings: The fair values of FHLB advances are estimated based on quoted market prices for the instrument if available, or for similar instruments if not available, or by using discounted cash flow analyses, based on current incremental borrowing rates for similar types of instruments.

See Note 13 for additional information on fair value measurements.

Other Acquisitions

During the second quarter of 2018, the Corporation completed the acquisition of Anderson Insurance & Investment Agency, Inc. ("Anderson"), an independent insurance agency based in Minneapolis, Minnesota. Anderson adds a range of complementary services and significant expertise in workers' compensation and executive risk management services. The transaction was valued at approximately $10 million. As a result of the acquisition, the Corporation recorded goodwill of approximately $7 million and added approximately $3 million of other intangibles related to customer relationships associated with the Anderson acquisition. The other intangibles related to the acquisition are being amortized on a straight-line basis over 7 years. See Note 8 for more information on goodwill and other intangible assets.

During the first quarter of 2018, the Corporation completed the acquisition of Diversified Insurance Solutions ("Diversified"). The acquisition improved Associated Benefits and Risk Consulting's ability to achieve greater scale in the Metro Milwaukee

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market and to further expand its Wisconsin employee benefits and property and casualty market position and capabilities. The transaction was valued at approximately $19 million. As a result of the acquisition, the Corporation recorded goodwill of approximately $10 million and other intangibles of approximately $8 million. The other intangibles related to the acquisition are being amortized on a straight-line basis over 10 years. See Note 8 for more information on goodwill and other intangible assets.

Note 3 Summary of Significant Accounting Policies

The accounting and reporting policies of the Corporation conform to U.S. generally accepted accounting principles and to general practice within the financial services industry. A discussion of these policies can be found in Note 1 Summary of Significant Accounting Policies section included in the Corporation’s 2017 Annual Report on Form 10-K. There have been two changes to the Corporation's significant accounting policies since December 31, 2017.

Business combinations

The Corporation accounts for its acquisitions using the purchase accounting method. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets that must be recognized. Typically, this allocation results in the purchase price exceeding the fair value of net assets acquired, which is recorded as goodwill. Core deposit intangibles are a measure of the value of checking, money market and savings deposits acquired in business combinations accounted for under the purchase method. Core deposit intangibles and other identified intangibles with finite useful lives are amortized using the straight line method over their estimated useful lives of up to ten years.

Loans that the Corporation acquires in connection with acquisitions are recorded at fair value with no carryover of the related allowance for credit losses. Fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. The excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. If a reasonable expectation on the amount or timing of such cash flows can't be determined, accretion of the fair value discount for nonperforming loans will be recognized using the cost recovery method of accounting.

The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the non-accretable discount. The non-accretable discount includes estimated future credit losses expected to be incurred over the life of the loan. Subsequent decreases to the expected cash flows will require the Corporation to evaluate the need for an additional allowance for credit losses. Subsequent improvement in expected cash flows will result in the reversal of a corresponding amount of the non-accretable discount which the Corporation will then reclassify as accretable discount that will be recognized into interest income over the remaining life of the loan.

The Corporation accounts for performing loans acquired in business combinations using the contractual cash flows method of recognizing discount accretion based on the acquired loans’ contractual cash flows. Purchased performing loans are recorded at fair value, including credit, interest, and liquidity discounts. The fair value discount is accreted as an adjustment to yield over the estimated lives of the loans. There is no allowance for loan losses established at the acquisition date for purchased performing loans. A provision for loan losses is recorded for any further deterioration in these loans subsequent to the acquisition.

Revenue Recognition

The Corporation recognizes revenue in accordance with ASC 606, "Revenue from Contracts with Customers." ASC 606 requires the Corporation to follow a five step process: (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. Revenue recognition under ASC 606 depicts 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 the goods or services.

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New Accounting Pronouncements Adopted

Standard	Description	Date of adoption	Effect on financial statements
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The FASB issued an amendment to allow a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption of the update is permitted and should be applied in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate related to the Tax Cut and Jobs Act of 2017 is recognized.	1st Quarter 2018	The Corporation has elected to early adopt this amendment. During the quarter, the Corporation reclassified approximately $14 million from accumulated other comprehensive income to retained earnings as a result of the Tax Cuts and Jobs Act. No material impact on results of operations, financial position, or liquidity. See Consolidated Statements of Comprehensive Income and the Statement of Changes in Stockholders' Equity.
ASU 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The FASB issued an amendment to better align a company’s financial reporting for hedging activities with the economic objectives of those activities for both financial (e.g., interest rate) and commodity risks. The provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also contains targeted improvements to simplify the application of hedge accounting guidance. This amendment is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Entities should apply the amendment on a modified retrospective transition method in which the cumulative effect of the change will be recognized within equity in the consolidated balance sheet as of the date of adoption. Early adoption is permitted, including in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes the interim period.	1st Quarter 2018	The Corporation has elected to early adopt this amendment. No material impact on results of operations, financial position, or liquidity. See Note 10 for expanded disclosures.
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 an amendment 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	No impact on results of operations, financial position, or liquidity. The Update required retrospective restatement. For the full year 2017, the Corporation reclassified approximately $9 million from personnel expense to other noninterest expense for the non-service cost components of net periodic pension cost and net periodic postretirement benefit cost. See Note 14 for expanded disclosure.
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 if: (1) 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) the asset group does not include a minimum of an input and a substantive process, it does not represent a business, and (3) 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, then 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	No material impact on results of operations, financial position, or 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	No impact on results of operations, financial position, or liquidity. See Consolidated Statements of Cash Flows.

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Standard	Description	Date of adoption	Effect on financial statements
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 on results of operations, financial position, or 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 from 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 bank owned life insurance) should be classified as cash inflows from investing, while the cash payments for the premiums may be classified as cash outflows from 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	No material impact on results of operations, financial position, or 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 has adopted this amendment and is using the cumulative-effect adjustment as of the beginning of the fiscal year of adoption. No material impact on the result of operations, financial position or liquidity. In 2008, the Corporation received Visa Class B restricted shares as part of Visa’s initial public offering. Based on the existing transfer restriction and the uncertainty of the covered litigation, the approximately 119 thousand Class B shares remaining that the Corporation owned as of June 30, 2018 are carried at a zero cost basis. See Consolidated Statements of Comprehensive Income and Note 13 Fair Value Measurements.
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.	1st Quarter 2018	The Corporation chose to adopt this amendment using the modified retrospective approach with no material impact on the Corporation's results of operations, financial position, or liquidity. See Note 17 for expanded disclosure requirements.

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Note 4 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,
	2018			2017			2018			2017
	(In Thousands, except per share data)
Net income	$	89,192		$	57,983		$	158,648		$	114,253
Preferred stock dividends	(2,329		)	(2,339		)	(4,668		)	(4,669		)
Net income available to common equity	$	86,863		$	55,644		$	153,980		$	109,584
Common shareholder dividends	(25,977		)	(18,326		)	(51,549		)	(36,577		)
Unvested share-based payment awards	(130		)	(110		)	(269		)	(227		)
Undistributed earnings	$	60,756		$	37,208		$	102,162		$	72,780
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Undistributed earnings allocated to unvested share-based payment awards	310			228			485			507
Undistributed earnings	$	60,756		$	37,208		$	102,162		$	72,780
Basic
Distributed earnings to common shareholders	$	25,977		$	18,326		$	51,549		$	36,577
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Total common shareholders earnings, basic	$	86,423		$	55,306		$	153,226		$	108,850
Diluted
Distributed earnings to common shareholders	$	25,977		$	18,326		$	51,549		$	36,577
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Total common shareholders earnings, diluted	$	86,423		$	55,306		$	153,226		$	108,850
Weighted average common shares outstanding	170,633			151,573			167,096			151,196
Effect of dilutive common stock awards	2,146			1,958			2,080			2,155
Effect of dilutive common stock warrants	630			771			744			796
Diluted weighted average common shares outstanding	173,409			154,302			169,920			154,147
Basic earnings per common share	$	0.51		$	0.36		$	0.92		$	0.72
Diluted earnings per common share	$	0.50		$	0.36		$	0.90		$	0.71

Anti-dilutive common stock options of approximately 1.5 million and 1 million for the three months ended June 30, 2018 and 2017, respectively, and 1.4 million and 900,000 for the six months ended June 30, 2018 and 2017, respectively, were excluded from the earnings per common share calculation.

Note 5 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.

Performance awards are based on performance goals of earnings per share and total shareholder return with vesting ranging from a minimum of 25% to a maximum of 150% of the target award. Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date.

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 stock options are expected to be outstanding and is estimated using historical data of stock option

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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 2018 and full year 2017.

	2018		2017
Dividend yield	2.50	%	2.00	%
Risk-free interest rate	2.60	%	2.00	%
Weighted average expected volatility	22.00	%	25.00	%
Weighted average expected life	5.75 years		5.5 years
Weighted average per share fair value of options	$4.47		$5.30

A summary of the Corporation’s stock option activity for the six months ended June 30, 2018 is presented below.

Stock Options	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value(a)
Outstanding at December 31, 2017	5,118,687		$	18.02	6.48	$	38,028
Granted	938,740		24.50
Assumed from Bank Mutual acquisition	370,051		14.35
Exercised	(888,661	)	16.69
Forfeited or expired	(38,613	)	24.21
Outstanding at June 30, 2018	5,500,204		$	19.05	6.69	$	45,418
Options Exercisable at June 30, 2018	3,287,488		$	16.80	5.39	$	34,551

(a) $ in Thousands

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, 2018, the intrinsic value of stock options exercised was approximately $9 million. For the six months ended June 30, 2017, the intrinsic value of the stock options exercised was $11 million. The total fair value of stock options vested was $4 million for the six months ended June 30, 2018 and June 30, 2017. The Corporation recognized compensation expense for the vesting of stock options of $2 million for both the six months ended June 30, 2018 and June 30, 2017. Included in compensation expense for 2018 was less than $1 million of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At June 30, 2018, 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 through first quarter 2022.

The following table summarizes information about the Corporation’s restricted stock activity for the six months ended June 30, 2018.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	2,026,071		$	19.68
Granted	573,877		24.65
Vested	(537,881	)	18.21
Forfeited	(30,480	)	22.16
Outstanding at June 30, 2018	2,031,587		$	21.87

The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant's award agreement. Performance-based restricted stock awards granted during 2017 and 2018 will vest ratably over a three year period. Service-based restricted stock awards granted during 2017 and 2018 will vest ratably over a four year period. Expense for restricted stock awards issued of approximately $6 million was recorded for the six months ended June 30, 2018 and $11 million was recorded for the six months ended June 30, 2017. Included in compensation expense for 2018 was approximately $1 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $25 million of unrecognized compensation costs related to restricted stock awards at June 30, 2018, that is expected to be recognized over the remaining requisite service periods that extend through first quarter 2022.

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

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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.

Note 6 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”). A portion of the portfolio is also comprised of asset-backed securities backed by student loans made under the Federal Family Education Loan Program ("FFELP"). The amortized cost and fair values of securities available for sale and held to maturity were as follows.

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June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,001	$	—	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	396,368		5,573		(5,232		)	396,709
GNMA	2,275,481		23		(65,315		)	2,210,189
Private-label	1,037		—		(5		)	1,031
GNMA commercial mortgage-related securities	1,400,680		—		(52,399		)	1,348,282
FFELP asset backed securities	298,263		1,679		(111		)	299,831
Other debt securities	3,000		—		—			3,000
Other equity securities	1,613		—		—			1,613
Total investment securities available for sale	$	4,377,443	$	7,275	$	(123,068	)	$	4,261,651
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,593,147	$	4,851	$	(17,698	)	$	1,580,300
Residential mortgage-related securities
FNMA / FHLMC	97,822		191		(2,306		)	95,707
GNMA	388,174		1,969		(13,020		)	377,123
GNMA commercial mortgage-related securities	523,103		8,542		(23,832		)	507,813
Total investment securities held to maturity	$	2,602,247	$	15,553	$	(56,856	)	$	2,560,943

December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,003	$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	457,680		9,722		(2,634		)	464,768
GNMA	1,944,453		275		(31,378		)	1,913,350
Private-label	1,067		—		(8		)	1,059
GNMA commercial mortgage-related securities	1,547,173		5		(33,901		)	1,513,277
FFELP asset backed securities	144,322		867		(13		)	145,176
Other debt securities	3,200		—		(12		)	3,188
Other equity securities	1,519		127		(14		)	1,632
Total investment securities available for sale	$	4,100,417	$	10,996	$	(67,967	)	$	4,043,446
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,281,320	$	13,899	$	(3,177	)	$	1,292,042
Residential mortgage-related securities
FNMA / FHLMC	40,995		398		(489		)	40,904
GNMA	414,440		2,700		(6,400		)	410,740
GNMA commercial mortgage-related securities	546,098		9,546		(15,756		)	539,888
Total investment securities held to maturity	$	2,282,853	$	26,543	$	(25,822	)	$	2,283,574

The expected maturities of investment securities available for sale and held to maturity at June 30, 2018 are shown below. Expected maturities may 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	$	3,001	$	2,996		$	46,938	$	47,269
Due after one year through five years	1,000		1,000			200,725		199,266
Due after five years through ten years	—		—			366,997		361,260
Due after ten years	—		—			978,487		972,504
Total debt securities	4,001		3,996			1,593,147		1,580,300
Residential mortgage-related securities
FNMA / FHLMC	396,368		396,709			97,822		95,707
GNMA	2,275,481		2,210,189			388,174		377,123
Private-label	1,037		1,031			—		—
GNMA commercial mortgage-related securities	1,400,680		1,348,282			523,103		507,813
FFELP asset backed securities	298,263		299,831			—		—
Equity securities	1,613		1,613			—		—
Total investment securities	$	4,377,443	$	4,261,651		$	2,602,247	$	2,560,943
Ratio of Fair Value to Amortized Cost			97.4		%			98.4		%

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The proceeds from the sale of investment securities for the six months ended June 30, 2018 and 2017 are shown below.

	Six Months Ended June 30,
	2018			2017
	($ in Thousands)
Gross gains on available for sale securities	$	—		$	—
Gross gains on held to maturity securities	—			361
Total gains	—			361
Gross losses on available for sale securities	(2,015		)	—
Gross losses on held to maturity securities	$	—		$	(5	)
Total losses	$	(2,015	)	$	(5	)
Investment securities gains (losses), net	$	(2,015	)	$	356
Proceeds from sales of investment securities	$	493,060		$	16,059

During the first six months of 2018, the Corporation sold approximately $40 million of lower yielding GNMA commercial mortgage-related securities. In addition, on the acquisition date, the Corporation sold Bank Mutual's entire $453 million securities portfolio.

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.

Investment securities with a carrying value of approximately $3.1 billion at both June 30, 2018 and December 31, 2017 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, 2018.

	Less than 12 months						12 months or more						Total
June 30, 2018	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	$	(6	)	$	996	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	19	(1,613		)	100,946		9	(3,620		)	128,509		(5,233		)	229,455
GNMA	62	(31,430		)	1,453,394		29	(33,885		)	756,061		(65,315		)	2,209,455
Private-label	—	—			—		1	(5		)	1,031		(5		)	1,031
GNMA commercial mortgage-related securities	22	(8,821		)	284,733		80	(43,577		)	1,063,701		(52,398		)	1,348,434
FFELP asset backed securities	7	(111		)	100,757		—	—			—		(111		)	100,757
Total	110	$	(41,975	)	$	1,939,830	120	$	(81,093	)	$	1,950,298	$	(123,068	)	$	3,890,128
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	890	$	(10,814	)	$	609,381	142	$	(6,884	)	$	128,244	$	(17,698	)	$	737,625
Residential mortgage-related securities
FNMA / FHLMC	25	(1,518		)	76,046		10	(788		)	14,728		(2,306		)	90,774
GNMA	61	(7,062		)	236,008		20	(5,957		)	137,093		(13,019		)	373,101
GNMA commercial mortgage-related securities	1	(813		)	29,243		24	(23,019		)	478,570		(23,832		)	507,813
Total	977	$	(20,207	)	$	950,678	196	$	(36,648	)	$	758,635	$	(56,856	)	$	1,709,313

18

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, 2017.

	Less than 12 months						12 months or more						Total
December 31, 2017	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U.S. Treasury securities	1	$	(7	)	$	996	—	$	—		$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	9	(572		)	69,939		9	(2,062		)	142,093		(2,634		)	212,032
GNMA	44	(8,927		)	1,028,221		25	(22,451		)	737,198		(31,378		)	1,765,419
Private-label	—	—			—		1	(8		)	1,059		(8		)	1,059
GNMA commercial mortgage-related securities	33	(5,554		)	480,514		70	(28,347		)	1,026,642		(33,901		)	1,507,156
FFELP asset backed securities	1	(13		)	12,158		—	—			—		(13		)	12,158
Other debt securities	1	(12		)	188		—	—			—		(12		)	188
Other equity securities	3	(14		)	1,487		—	—			—		(14		)	1,487
Total	92	$	(15,099	)	$	1,593,503	105	$	(52,868	)	$	1,906,992	$	(67,967	)	$	3,500,495
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	157	$	(746	)	$	122,761	132	$	(2,431	)	$	127,043	$	(3,177	)	$	249,804
Residential mortgage-related securities
FNMA / FHLMC	8	(73		)	13,143		10	(417		)	16,262		(490		)	29,405
GNMA	35	(3,373		)	268,388		18	(3,026		)	120,892		(6,399		)	389,280
GNMA commercial mortgage-related securities	2	(299		)	52,997		23	(15,457		)	486,891		(15,756		)	539,888
Total	202	$	(4,491	)	$	457,289	183	$	(21,331	)	$	751,088	$	(25,822	)	$	1,208,377

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, 2018 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 unrealized losses at June 30, 2018 for mortgage-related securities is due to the increase in overall interest rates. The U.S. Treasury 3 year and 5 year rates increased by 65 bp and 53 bp, respectively, from December 31, 2017. The Corporation does not intend to sell nor does it believe that it will be required to sell the securities in an unrealized loss position 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, 2018, and December 31, 2017, the Corporation had FHLB stock of $173 million and $89 million, respectively. The Corporation had Federal Reserve Bank stock of $76 million at both June 30, 2018 and December 31, 2017.

19

Note 7 Loans

The period end loan composition was as follows.

	June 30, 2018(a)		December 31, 2017
	($ in Thousands)
Commercial and industrial	$	7,109,796	$	6,399,693
Commercial real estate — owner occupied	888,330		802,209
Commercial and business lending	7,998,126		7,201,902
Commercial real estate — investor	3,996,415		3,315,254
Real estate construction	1,487,159		1,451,684
Commercial real estate lending	5,483,574		4,766,938
Total commercial	13,481,700		11,968,840
Residential mortgage	8,207,253		7,546,534
Home equity	911,363		883,804
Other consumer	376,470		385,813
Total consumer	9,495,086		8,816,151
Total loans	$	22,976,786	$	20,784,991

(a) Includes $16 million of purchased credit-impaired loans

The following table presents commercial and consumer loans by credit quality indicator at June 30, 2018.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,763,557	$	92,286	$	172,177	$	81,776	$	7,109,796
Commercial real estate - owner occupied	814,769		16,033		38,879		18,649		888,330
Commercial and business lending	7,578,326		108,319		211,056		100,425		7,998,126
Commercial real estate - investor	3,885,535		59,587		24,790		26,503		3,996,415
Real estate construction	1,452,888		29,559		3,168		1,544		1,487,159
Commercial real estate lending	5,338,423		89,146		27,958		28,047		5,483,574
Total commercial	12,916,749		197,465		239,014		128,472		13,481,700
Residential mortgage	8,141,803		199		2,355		62,896		8,207,253
Home equity	897,471		792		142		12,958		911,363
Other consumer	375,624		706		6		134		376,470
Total consumer	9,414,898		1,697		2,503		75,988		9,495,086
Total	$	22,331,647	$	199,162	$	241,517	$	204,460	$	22,976,786

20

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2017.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,015,884	$	157,245	$	113,778	$	112,786	$	6,399,693
Commercial real estate - owner occupied	723,291		14,181		41,997		22,740		802,209
Commercial and business lending	6,739,175		171,426		155,775		135,526		7,201,902
Commercial real estate - investor	3,266,389		24,845		19,291		4,729		3,315,254
Real estate construction	1,421,504		29,206		—		974		1,451,684
Commercial real estate lending	4,687,893		54,051		19,291		5,703		4,766,938
Total commercial	11,427,068		225,477		175,066		141,229		11,968,840
Residential mortgage	7,490,860		426		1,616		53,632		7,546,534
Home equity	868,958		1,137		195		13,514		883,804
Other consumer	384,990		652		—		171		385,813
Total consumer	8,744,808		2,215		1,811		67,317		8,816,151
Total	$	20,171,876	$	227,692	$	176,877	$	208,546	$	20,784,991

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, 2018.

	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	$	7,027,210	$	407	$	181	$	222	$	81,776	$	7,109,796
Commercial real estate - owner occupied	869,488		193		—		—		18,649		888,330
Commercial and business lending	7,896,698		600		181		222		100,425		7,998,126
Commercial real estate - investor	3,969,084		828		—		—		26,503		3,996,415
Real estate construction	1,465,850		19,765		—		—		1,544		1,487,159
Commercial real estate lending	5,434,934		20,593		—		—		28,047		5,483,574
Total commercial	13,331,632		21,193		181		222		128,472		13,481,700
Residential mortgage	8,135,016		9,158		183		—		62,896		8,207,253
Home equity	891,135		6,534		736		—		12,958		911,363
Other consumer	372,984		972		763		1,617		134		376,470
Total consumer	9,399,135		16,664		1,682		1,617		75,988		9,495,086
Total	$	22,730,767	$	37,857	$	1,863	$	1,839	$	204,460	$	22,976,786

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2018 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans, $141 million or 69% were current with respect to payment at June 30, 2018.

21

The following table presents loans by past due status at December 31, 2017.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due(a)		Nonaccrual(b)		Total
	($ in Thousands)
Commercial and industrial	$	6,286,369	$	170	$	101	$	267	$	112,786	$	6,399,693
Commercial real estate - owner occupied	779,421		48		—		—		22,740		802,209
Commercial and business lending	7,065,790		218		101		267		135,526		7,201,902
Commercial real estate - investor	3,310,000		374		—		151		4,729		3,315,254
Real estate construction	1,450,459		168		83		—		974		1,451,684
Commercial real estate lending	4,760,459		542		83		151		5,703		4,766,938
Total commercial	11,826,249		760		184		418		141,229		11,968,840
Residential mortgage	7,483,350		9,186		366		—		53,632		7,546,534
Home equity	863,465		5,688		1,137		—		13,514		883,804
Other consumer	382,186		1,227		780		1,449		171		385,813
Total consumer	8,729,001		16,101		2,283		1,449		67,317		8,816,151
Total	$	20,555,250	$	16,861	$	2,467	$	1,867	$	208,546	$	20,784,991

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2017 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans, $135 million or 65% were current with respect to payment at December 31, 2017.

22

The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $16 million of purchased credit-impaired loans, at June 30, 2018.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	75,928	$	77,873	$	17,628	$	70,082	$	725
Commercial real estate — owner occupied	15,386		15,853		829		15,649		95
Commercial and business lending	91,314		93,726		18,457		85,731		820
Commercial real estate — investor	15,397		15,469		4,132		15,485		901
Real estate construction	448		523		77		456		15
Commercial real estate lending	15,845		15,992		4,209		15,941		916
Total commercial	107,159		109,718		22,666		101,672		1,736
Residential mortgage	39,926		44,171		6,208		39,433		863
Home equity	9,817		10,809		3,514		9,917		282
Other consumer	1,049		1,051		109		1,051		1
Total consumer	50,792		56,031		9,831		50,401		1,146
Total loans(a)	$	157,951	$	165,749	$	32,497	$	152,073	$	2,882
Loans with no related allowance
Commercial and industrial	$	35,065	$	47,914	$	—	$	39,201	$	(286	)
Commercial real estate — owner occupied	4,869		5,920		—		4,179		24
Commercial and business lending	39,934		53,834		—		43,380		(262		)
Commercial real estate — investor	984		1,031		—		1,006		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	984		1,031		—		1,006		—
Total commercial	40,918		54,865		—		44,386		(262		)
Residential mortgage	11,543		11,862		—		7,839		128
Home equity	1,275		1,289		—		785		12
Other consumer	—		—		—		—		—
Total consumer	12,818		13,151		—		8,624		140
Total loans(a)	$	53,736	$	68,016	$	—	$	53,010	$	(122	)
Total
Commercial and industrial	$	110,993	$	125,787	$	17,628	$	109,283	$	439
Commercial real estate — owner occupied	20,255		21,773		829		19,828		119
Commercial and business lending	131,248		147,560		18,457		129,111		558
Commercial real estate — investor	16,381		16,500		4,132		16,491		901
Real estate construction	448		523		77		456		15
Commercial real estate lending	16,829		17,023		4,209		16,947		916
Total commercial	148,077		164,583		22,666		146,058		1,474
Residential mortgage	51,469		56,033		6,208		47,272		991
Home equity	11,092		12,098		3,514		10,702		294
Other consumer	1,049		1,051		109		1,051		1
Total consumer	63,610		69,182		9,831		59,025		1,286
Total loans(a)	$	211,687	$	233,765	$	32,497	$	205,083	$	2,760

(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, 2018.

23

The following table presents impaired loans individually evaluated under ASC Topic 310 at December 31, 2017. 

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	81,649	$	83,579	$	10,838	$	58,494	$	2,629
Commercial real estate — owner occupied	23,796		23,937		2,973		12,124		736
Commercial and business lending	105,445		107,516		13,811		70,618		3,365
Commercial real estate — investor	17,823		17,862		1,597		16,924		1,694
Real estate construction	467		578		86		484		29
Commercial real estate lending	18,290		18,440		1,683		17,408		1,723
Total commercial	123,735		125,956		15,494		88,026		5,088
Residential mortgage	40,561		42,922		6,512		40,411		1,614
Home equity	10,250		10,986		3,718		10,521		549
Other consumer	1,135		1,138		122		1,140		3
Total consumer	51,946		55,046		10,352		52,072		2,166
Total loans(a)	$	175,681	$	181,002	$	25,846	$	140,098	$	7,254
Loans with no related allowance
Commercial and industrial	$	60,595	$	82,839	$	—	$	89,275	$	492
Commercial real estate — owner occupied	2,438		2,829		—		1,948		36
Commercial and business lending	63,033		85,668		—		91,223		528
Commercial real estate — investor	1,295		1,295		—		—		45
Real estate construction	—		—		—		—		—
Commercial real estate lending	1,295		1,295		—		—		45
Total commercial	64,328		86,963		—		91,223		573
Residential mortgage	6,925		7,204		—		4,999		217
Home equity	641		645		—		540		7
Other consumer	—		—		—		—		—
Total consumer	7,566		7,849		—		5,539		224
Total loans(a)	$	71,894	$	94,812	$	—	$	96,762	$	797
Total
Commercial and industrial	$	142,244	$	166,418	$	10,838	$	147,769	$	3,121
Commercial real estate — owner occupied	26,234		26,766		2,973		14,072		772
Commercial and business lending	168,478		193,184		13,811		161,841		3,893
Commercial real estate — investor	19,118		19,157		1,597		16,924		1,739
Real estate construction	467		578		86		484		29
Commercial real estate lending	19,585		19,735		1,683		17,408		1,768
Total commercial	188,063		212,919		15,494		179,249		5,661
Residential mortgage	47,486		50,126		6,512		45,410		1,831
Home equity	10,891		11,631		3,718		11,061		556
Other consumer	1,135		1,138		122		1,140		3
Total consumer	59,512		62,895		10,352		57,611		2,390
Total loans(a)	$	247,575	$	275,814	$	25,846	$	236,860	$	8,051

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 80% of the unpaid principal balance at December 31, 2017.

24

Troubled Debt Restructurings (“Restructured Loans”)

Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	June 30, 2018				December 31, 2017
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	32,438	$	155	$	30,047	$	1,776
Commercial real estate — owner occupied	3,820		—		3,989		—
Commercial real estate — investor	372		14,268		14,389		—
Real estate construction	222		226		310		157
Residential mortgage	17,934		20,372		17,068		18,991
Home equity	7,900		2,972		7,705		2,537
Other consumer	1,037		12		1,110		25
Total	$	63,723	$	38,005	$	74,618	$	23,486

(a) Nonaccrual restructured loans have been included within nonaccrual loans.

The Corporation had a recorded investment of approximately $4 million in loans modified in troubled debt restructurings during the six months ended June 30, 2018, of which less than $1 million were in accrual status and approximately $4 million were in nonaccrual pending a sustained period of repayment.

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the six months ended June 30, 2018 and 2017, respectively, and the recorded investment and unpaid principal balance as of June 30, 2018 and 2017, respectively.

	Six Months Ended June 30, 2018					Six Months Ended June 30, 2017
	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	1	$	47	$	47	24	$	30,935	$	52,260
Commercial real estate — owner occupied	—	—		—		2	716		716
Commercial real estate — investor	1	984		1,031		—	—		—
Residential mortgage	10	2,064		2,064		36	2,695		2,805
Home equity	10	935		949		26	674		919
Other consumer	1	5		8		—	—		—
Total	23	$	4,035	$	4,099	88	$	35,020	$	56,700

(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, 2018, 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, 2018.

25

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, 2018 and 2017, respectively, as well as the recorded investment in these restructured loans as of June 30, 2018 and 2017, respectively.

	Six Months Ended June 30, 2018			Six Months Ended June 30, 2017
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial and industrial	3	$	—	—	$	—
Residential mortgage	8	2,219		17	941
Home equity	21	1,409		9	271
Total	32	$	3,628	26	$	1,212

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

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.

The following table presents a summary of the changes in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018.

($ 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, 2017	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Charge offs	(19,611		)	(1,042		)	(1,202		)	(53		)	(956		)	(1,729		)	(2,488		)	(27,081		)
Recoveries	6,406			287			21			290			690			1,192			416			9,302
Net Charge offs	(13,205		)	(755		)	(1,181		)	237			(266		)	(537		)	(2,072		)	(17,779		)
Provision for loan losses	750			1,213			4,272			(5,455		)	1,796			(301		)	2,225			4,500
June 30, 2018	$	110,613		$	10,810		$	44,150		$	29,152		$	31,137		$	21,288		$	5,451		$	252,601
Allowance for loan losses
Individually evaluated for impairment	$	17,628		$	829		$	4,132		$	77		$	6,208		$	3,514		$	109		$	32,497
Collectively evaluated for impairment	92,985			9,981			40,018			29,075			24,929			17,774			5,342			220,104
Acquired and accounted for under ASC 310-30(a)	—			—			—			—			—			—			—			—
Total allowance for loan losses	$	110,613		$	10,810		$	44,150		$	29,152		$	31,137		$	21,288		$	5,451		$	252,601
Loans
Individually evaluated for impairment	$	110,993		$	20,255		$	16,381		$	448		$	51,469		$	11,092		$	1,049		$	211,687
Collectively evaluated for impairment	6,996,038			866,356			3,969,829			1,486,464			8,154,904			900,187			375,421			22,749,199
Acquired and accounted for under ASC 310-30(a)	2,765			1,719			10,205			247			880			84			—			15,900
Total loans	$	7,109,796		$	888,330		$	3,996,415		$	1,487,159		$	8,207,253		$	911,363		$	376,470		$	22,976,786

(a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality."

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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, 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	(44,533		)	(344		)	(991		)	(604		)	(2,611		)	(2,724		)	(4,439		)	(56,246		)
Recoveries	11,465			173			242			74			927			3,194			716			16,791
Net Charge offs	(33,068		)	(171		)	(749		)	(530		)	(1,684		)	470			(3,723		)	(39,455		)
Provision for loan losses	16,010			(3,511		)	(3,477		)	7,968			4,245			1,292			4,473			27,000
December 31, 2017	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Allowance for loan losses
Individually evaluated for impairment	$	10,838		$	2,973		$	1,597		$	86		$	6,512		$	3,718		$	122		$	25,846
Collectively evaluated for impairment	112,230			7,379			39,462			34,284			23,095			18,408			5,176			240,034
Total allowance for loan losses	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Loans
Individually evaluated for impairment	$	142,244		$	26,234		$	19,118		$	467		$	47,486		$	10,891		$	1,135		$	247,575
Collectively evaluated for impairment	6,257,449			775,975			3,296,136			1,451,217			7,499,048			872,913			384,678			20,537,416
Total loans	$	6,399,693		$	802,209		$	3,315,254		$	1,451,684		$	7,546,534		$	883,804		$	385,813		$	20,784,991

The allowance related to the oil and gas portfolio was $17 million at June 30, 2018 and represented 2.5% of total oil and gas loans.

($ in Millions)	Six Months Ended June 30, 2018			Year Ended December 31, 2017
Balance at beginning of period	$	27		$	38
Charge offs	(14		)	(25		)
Recoveries	3			—
Net Charge offs	(11		)	(25		)
Provision for loan losses	1			14
Balance at end of period	$	17		$	27
Allowance for loan losses
Individually evaluated for impairment	$	9		$	5
Collectively evaluated for impairment	8			22
Total allowance for loan losses	$	17		$	27
Loans
Individually evaluated for impairment	$	45		$	77
Collectively evaluated for impairment	637			523
Total loans	$	682		$	600

The following table presents a summary of the changes in the allowance for unfunded commitments.

	Six Months Ended June 30, 2018			Year Ended December 31, 2017
	($ in Thousands)
Allowance for Unfunded Commitments
Balance at beginning of period	$	24,400		$	25,400
Provision for unfunded commitments	(500		)	(1,000		)
Amount recorded at acquisition	2,436			—
Balance at end of period	$	26,336		$	24,400

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Loans Acquired in Acquisition

Loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. Acquired loans are segregated into two types:

• Performing loans are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination.

• Nonperforming loans are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination.

For performing loans the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans.

In accordance with ASC 310-30, purchased credit-impaired loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows. If a reasonable expectation on the amount or timing of such cash flows cannot be determined, accretion of the fair value discount for nonperforming loans will be recognized using the cost recovery method of accounting.

Changes in the accretable yield for loans acquired and accounted for under ASC Topic 310-30 were as follows for the six months ended June 30, 2018 and for the year ended December 31, 2017

	Six Months Ended June 30, 2018			Year Ended December 31, 2017
	($ in Thousands)
Changes in Accretable Yield
Balance at beginning of period	$	—		$	—
Purchases	4,881			—
Accretion	(119		)	—
Balance at end of period	$	4,762		$	—

For loans acquired, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors.

At June 30, 2018, the Corporation had a total of approximately $32 million in net unaccreted purchase discount, of which approximately $26 million was related to performing loans and approximately $7 million was related to nonperforming loans.

Note 8 Goodwill and Other Intangible Assets

Goodwill

Goodwill is not amortized but is instead 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 2018, 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 2018 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 have been no events since the May 2018 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2017 or the first six months of 2018.

At June 30, 2018, the Corporation had goodwill of $1.2 billion, compared to $976 million at December 31, 2017. Goodwill increased $173 million related to the Bank Mutual acquisition, $10 million related to the acquisition of Diversified, and $7 million related to the acquisition of Anderson. See Note 2 for additional information on the Corporation's acquisitions.

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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 2018, the Corporation added approximately $58 million of core deposit intangibles as a result of the Bank Mutual acquisition. In addition, the Corporation added approximately $8 million of other intangibles relating to customer relationships associated with the Diversified acquisition. During the second quarter of 2018, the Corporation added approximately $3 million of other intangibles related to customer relationships associated with the Anderson 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Core deposit intangibles
Gross carrying amount	$	58,100		$	4,385
Accumulated amortization	(2,421		)	(4,385		)
Net book value	$	55,679		$	—
Additions during the periods	$	58,100		$	—
Amortization during the year	$	2,421		$	112
Other intangibles
Gross carrying amount	$	44,931		$	34,572
Accumulated amortization	(20,262		)	(18,992		)
Net book value	$	24,668		$	15,580
Additions during the period	$	10,359		$	2,162
Amortization during the year	$	1,270		$	1,847

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 evaluates its mortgage servicing rights asset for impairment at minimum on a quarterly basis. 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	59,168		$	62,085
Additions from acquisition	8,136			—
Additions	4,502			7,167
Amortization	(4,649		)	(10,084		)
Mortgage servicing rights at end of period	$	67,157		$	59,168
Valuation allowance at beginning of period	(784		)	(609		)
(Additions) recoveries, net	607			(175		)
Valuation allowance at end of period	(177		)	(784		)
Mortgage servicing rights, net	$	66,980		$	58,384
Fair value of mortgage servicing rights	$	84,585		$	64,387
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	8,500,578		$	7,646,846
Mortgage servicing rights, net to servicing portfolio	0.79		%	0.76		%
Mortgage servicing rights expense (a)	$	4,042		$	10,259

(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, 2018. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Six Months Ending December 31, 2018	$	2,905	$	1,563	$	4,725
2019	5,810		2,828		9,150
2020	5,810		2,711		7,963
2021	5,810		2,687		6,906
2022	5,810		2,663		6,000
2023	5,810		2,644		5,228
Beyond 2023	23,724		9,571		27,185
Total Estimated Amortization Expense	$	55,679	$	24,668	$	67,157

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Note 9 Short and Long-Term Funding

The following table presents the components of short-term funding (funding with original contractual maturities of one year or less), long-term funding (funding with original contractual maturities greater than one year), and FHLB advances (funding based on original contractual maturities).

	June 30, 2018			December 31, 2017
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	20,720		$	141,950
Securities sold under agreements to repurchase	183,013			182,865
Federal funds purchased and securities sold under agreements to repurchase	203,733			324,815
Commercial paper	52,791			67,467
Total short-term funding	$	256,525		$	392,282
Long-Term Funding
Senior notes, at par	$	250,000		$	250,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs	(2,381		)	(2,718		)
Total long-term funding	497,619			497,282
Total short and long-term funding, excluding FHLB advances	$	754,144		$	889,564
FHLB Advances
Short-term FHLB advances	$	370,000		$	284,000
Long-term FHLB advances	4,427,857			2,900,168
Total FHLB advances	$	4,797,857		$	3,184,168
Total short and long-term funding	$	5,552,001		$	4,073,732

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, 2018, the Corporation pledged agency mortgage-related securities with a fair value of $279 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, 2018 and December 31, 2017 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, 2018					($ in Thousands)
Repurchase agreements
Agency mortgage-related securities	$	183,013	$	—	$	—	$	—	$	183,013
Total	$	183,013	$	—	$	—	$	—	$	183,013
December 31, 2017
Repurchase agreements
Agency mortgage-related securities	$	182,865	$	—	$	—	$	—	$	182,865
Total	$	182,865	$	—	$	—	$	—	$	182,865

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Long-Term Funding

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.

FHLB Advances

At June 30, 2018, the Corporation had $4.8 billion of FHLB advances, up $1.6 billion from December 31, 2017. The increase in FHLB borrowing is primarily a result of reduced reliance on network transaction deposits over the year.

At June 30, 2018, FHLB advances had maturity or put dates (callable by the FHLB) primarily ranging from 2018 through 2020, and had a weighted average interest rate of 1.97%, compared to 1.26% at December 31, 2017. A portion of the FHLB advances are indexed to the FHLB discount note and re-price at varying intervals. The advances offer flexible, market rate, long-term funding that improves the Corporation’s liquidity profile.

As of June 30, 2018, the Corporation had $2.6 billion of putable FHLB advances with a one-time option where the FHLB can call the advance prior to the contractual maturity. The contractual weighted average life to the put date of these advances was 1.4 years with a weighted average life to contractual maturity of 6.6 years . As of June 30, 2018, it is anticipated that all of these advances will be called by the FHLB on their put date.

The original contractual maturity or next put date of the Corporation's FHLB advances as of June 30, 2018 and December 31, 2017 are presented in the following table.

	June 30, 2018				December 31, 2017
	Amount		Weighted Average Contractual Coupon Rate		Amount		Weighted Average Contractual Coupon Rate
	($ in Thousands)
Maturity or put date within 1 year	$	2,632,613	1.70	%	$	2,434,000	1.26	%
After 1 but within 2	1,861,040		2.25	%	750,013		1.23	%
After 2 but within 3	291,606		2.60	%	155		4.91	%
After 3 years	12,598		4.55	%	—		—	%
FHLB advances and overall rate	$	4,797,857	1.97	%	$	3,184,168	1.26	%

Note 10 Derivative and Hedging Activities

The Corporation is exposed to certain risk arising from both its business operations and economic conditions. The Corporation principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Corporation enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Corporation's derivative financial instruments are used to manage differences in the amount, timing, and duration of the Corporation's known or expected cash receipts and its known or expected cash payments principally related to the Corporation's assets.

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 pledged $35 million of investment securities as collateral at June 30, 2018, and pledged $24 million of investment securities as collateral at December 31, 2017. 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, 2018 the Corporation posted $48 million of cash collateral for the margin compared to $22 million at December 31, 2017.

Fair Value Hedges of Interest Rate Risk

The Corporation is exposed to changes in the fair value of certain of its pools of prepayable fixed-rate assets due to changes in benchmark interest rates. The Corporation uses interest rate swaps to manage its exposure to changes in fair value on these

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instruments attributable to changes in the designated benchmark interest rate. Interest rate swaps designated as fair value hedges involve the payment of fixed-rate amounts to a counterparty in exchange for the Corporation receiving variable-rate payments over the life of the agreements without the exchange of the underlying notional amount.

For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in interest income.

Derivatives to Accommodate Customer Needs

The Corporation also facilitates customer borrowing activity by entering 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 markets, 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. The Corporation's 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.

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.

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The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments.

	June 30, 2018						December 31, 2017
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Notional Amount		Fair Value			Balance Sheet Category
Derivatives not designated as hedging instruments
Interest rate-related instruments — customer and mirror	$	2,668,542	$	62,708		Trading assets	$	2,183,687	$	28,494		Trading assets
Interest rate-related instruments — customer and mirror	2,668,542		(62,141		)	Trading liabilities	2,183,687		(28,035		)	Trading liabilities
Foreign currency exchange forwards	143,551		3,317			Trading assets	124,851		2,495			Trading assets
Foreign currency exchange forwards	136,177		(3,091		)	Trading liabilities	118,094		(2,339		)	Trading liabilities
Commodity contracts	419,459		66,894			Trading assets	457,868		38,686			Trading assets
Commodity contracts	419,458		(66,380		)	Trading liabilities	457,108		(37,286		)	Trading liabilities
Interest rate lock commitments (mortgage)	335,070		3,287			Other assets	222,736		1,538			Other assets
Forward commitments (mortgage)	312,003		(919		)	Other liabilities	164,567		(313		)	Other liabilities
Purchased options (time deposit)	25,511		1,027			Other assets	31,063		1,175			Other assets
Written options (time deposit)	25,511		(1,027		)	Other liabilities	31,063		(1,175		)	Other liabilities
Derivatives designated as hedging instruments
Interest Rate Products	500,000		2,396			Other assets	—		—			Other assets

The following table presents amounts that were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges.

	Line Item in the Statement of Financial Position in Which the Hedged Item is Included
	Carrying Amount of the Hedged Assets/(Liabilities)		Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)
($ in Thousands)	June 30, 2018
Loans and investment securities receivables (a)	497,591		(2,409		)
Total	$	497,591	$	(2,409	)

(a) These amounts include the amortized cost basis of closed portfolios used to designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At June 30, 2018, the amortized cost basis of the closed portfolios used in these hedging relationships was $1.2 billion; the negative cumulative basis adjustments associated with these hedging relationships was $2.4 million; and the amounts of the designated hedged items were $500 million.

The table below identifies the effect of fair value hedge accounting on the Corporation's statement of performance during the six months ended June 30, 2018.

	Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships
	Six Months Ended June 30, 2018			Year Ended December 31, 2017
($ in Thousands)	Interest Income		Other Income (Expense)	Interest Income	Other Income (Expense)
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded	(13	)	—	—	—
The effects of fair value and cash flow hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20
Interest contracts
Hedged items	(2,409	)	—	—	—
Derivatives designated as hedging instruments	2,396		—	—	—

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The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's statement of performance during the six months ended June 30, 2018.

	Income Statement Category of Gain / (Loss) Recognized in Income	For the Six Months Ended June 30,
($ in Thousands)		2018			2017
Derivative Instruments
Interest rate-related instruments — customer and mirror, net	Capital markets, net	$	108		$	(69	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,749			2,474
Forward commitments (mortgage)	Mortgage banking, net	(606		)	(2,749		)
Foreign currency exchange forwards	Capital markets, net	70			9
Commodity contracts	Capital markets, net	(886		)	198

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Note 11 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 the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.

	Gross amounts of recognized assets						Gross amounts not offset in the balance sheet
($ in Thousands)			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Derivative liability available for offset			Collateral received			Net amount
Derivative assets: (a)
June 30, 2018	$	68,065	$	—	$	68,065	$	(27,040	)	$	(38,601	)	$	2,424
December 31, 2017	29,503		—		29,503		(16,140		)	(13,234		)	129
	Gross amounts of recognized liabilities						Gross amounts not offset in the balance sheet
($ in Thousands)			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Derivative asset available for offset			Collateral pledged			Net amount
Derivative liabilities (b)
June 30, 2018	$	63,363	$	—	$	63,363	$	(27,040	)	$	(35,513	)	$	810
December 31, 2017	37,164		—		37,164		(16,140		)	(20,662		)	362
(a) Includes interest and commodity instrument assets. (b) Includes interest and commodity instrument liabilities.

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Note 12 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, 2018		December 31, 2017
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	8,552,601	$	8,027,187
Commercial letters of credit(a)	13,167		11,886
Standby letters of credit(c)	255,858		235,361

(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, 2018 or December 31, 2017.

(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.

(c) The Corporation has established a liability of $3 million at June 30, 2018 and $2 million at December 31, 2017, 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 $26 million at June 30, 2018 and $24 million at December 31, 2017, 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 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, 2018 was $137 million, compared to $147 million at December 31, 2017.

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 principal investment 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 loan pools that support CRA loans. The timing of future cash requirements to fund these pools is dependent upon loan demand, which can vary over time. The aggregate carrying value of these investments at June 30, 2018 was $25 million, compared to $23 million at December 31, 2017, included in other assets on the consolidated balance sheets.

Related to these investments, the Corporation had remaining commitments to fund $99 million at June 30, 2018, and $119 million at December 31, 2017.

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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. On January 23, 2018, the District Court approved a settlement agreement between the parties.  Based on the terms of the settlement agreement, the Bank expects that the litigation will not have a material adverse impact on the Bank regardless of the outcome of the appeal to the Eighth Circuit Court of Appeals. 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.

Subsequent to the announcement on July 20, 2017, of the Merger Agreement between the Corporation and Bank Mutual, several lawsuits were filed in connection with the proposed merger. On July 28, 2017, two substantially identical purported class action complaints, each by various individual plaintiffs, were filed with the Wisconsin Circuit Court for Milwaukee County on behalf of the respective named plaintiffs and other Bank Mutual shareholders against Bank Mutual, the members of the Bank Mutual board, and the Corporation. The lawsuits are captioned Schumel et al v. Bank Mutual Corporation et al. and Paquin et al. v. Bank Mutual Corporation et al. Both complaints allege state law breach of fiduciary duty claims against the Bank Mutual board for, among other things, seeking to sell Bank Mutual through an allegedly defective process, for an allegedly unfair price and on allegedly unfair terms. On August 30, 2017, a third purported class action complaint, captioned Wollenburg et al. v. Bank Mutual Corporation et al., was filed in the Wisconsin Circuit Court for Milwaukee County, on behalf of the same class of shareholders and against the same defendants as the prior two complaints. The Wollenburg complaint asserts similar allegations as the prior two complaints, and further alleges that the preliminary proxy statement/prospectus filed with the SEC contains various alleged misstatements or omissions under federal securities law. The Paquin, Schumel and Wollenburg complaints allege that the Corporation aided and abetted Bank Mutual's directors' alleged breaches of fiduciary duty. The parties have entered into a stipulation seeking to consolidate the three actions. On September 13, 2017, the Corporation filed a notice of removal of the Paquin, Schumel and Wollenburg actions to the United States District Court for the Eastern District of Wisconsin. On September 15, 2017, the plaintiffs in the Paquin, Schumel and Wollenburg actions filed identical motions to remand the three cases back to state court, and on September 27, 2017, the defendants filed oppositions to the motions to remand. On October 3, 2017, the defendants filed motions to dismiss the three actions. On September 6, 2017, a fourth purported class action complaint, captioned Parshall et al., v. Bank Mutual Corporation et al., was filed in the U.S. District Court for the Eastern District of Wisconsin, on behalf of the same class of shareholders and against the same defendants as the prior complaints. The Parshall complaint criticizes the adequacy of the merger consideration and alleges that Bank Mutual, the members of the Bank Mutual board and the Corporation allegedly omitted and/or misrepresented certain information in the registration statement on Form S-4 filed in connection with the proposed merger in violation of the federal securities laws. The lawsuits seek, among other things, to enjoin the consummation of the transaction and damages. The

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Corporation believes the allegations are without merit. On October 13, 2017, Bank Mutual and the Corporation reached agreement with the plaintiffs in each of the four cases whereby Bank Mutual issued certain additional disclosures in a Form 8-K, and each of the plaintiffs have agreed to dismiss their actions with prejudice as to the named plaintiffs and without prejudice as to the rest of the purported class members.

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 3 years 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.

A variety of consumer products, including mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters.

Mortgage Repurchase Reserve

The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under the Corporation's 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 $1 million during both the six months ended June 30, 2018 and the year ended December 31, 2017. The loss reimbursement and settlement claims paid for the six months ended June 30, 2018 were zero and negligible for the year ended December 31, 2017. Make whole requests during 2017 and the first six months of 2018 generally arose from loans sold during the period of January 1, 2012 to December 31, 2017. Since January 1, 2012, loans sold totaled $10.5 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of June 30, 2018, approximately $6.2 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Balance at beginning of period	$	987		$	900
Repurchase provision expense	150			246
Charge offs, net	(90		)	(159		)
Amount recorded at acquisition	88			—
Balance at end of period	$	1,135		$	987

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, 2018, and December 31, 2017, there were approximately $39 million and $44 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.

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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, 2018 and December 31, 2017, there were $64 million and $73 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

Note 13 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 carried at estimated fair value. Management has 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 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 utilizes interest rate swaps to hedge exposure to interest rate risk and variability of fair value related to changes in the underlying interest rate of the hedged item. These hedged interest rate swaps are classified as fair value hedges. See Note 10 for additional disclosure regarding the Corporation’s fair value hedges.

In addition, the Corporation offers interest rate-related instruments (swaps and caps) to service its 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 measurement reflects the contractual terms of the derivative financial instruments, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. More specifically, the fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) with the variable cash payments (or receipts) based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. Likewise, the fair values of interest rate options (i.e., interest rate caps) are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (or rise above) the strike rate of the floors (or caps), with the variable interest rates used in the calculation of projected receipts on the floor (or cap) based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

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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, 2018, and December 31, 2017, 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 its 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 instruments, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s commodity contracts.

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.

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, 2018, and December 31, 2017, and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments in their entirety are classified within Level 2 of the fair value hierarchy.

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The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Hierarchy	June 30, 2018		December 31, 2017
		($ in Thousands)
Assets
Investment securities available for sale
U.S. Treasury securities	Level 1	$	996	$	996
Residential mortgage-related securities
FNMA / FHLMC	Level 2	396,709		464,768
GNMA	Level 2	2,210,189		1,913,350
Private-label	Level 2	1,031		1,059
GNMA commercial mortgage-related securities	Level 2	1,348,282		1,513,277
FFELP asset backed securities	Level 2	299,831		145,176
Other equity securities	Level 1	1,613		1,632
Other debt securities	Level 2	3,000		3,188
Total investment securities available for sale	Level 1	2,609		2,628
Total investment securities available for sale	Level 2	4,259,042		4,040,818
Residential loans held for sale	Level 2	143,022		85,544
Interest rate-related instruments	Level 2	62,708		28,494
Foreign currency exchange forwards	Level 2	3,317		2,495
Interest rate products (designated as hedging instruments)	Level 2	2,396		—
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	3,287		1,538
Commodity contracts	Level 2	66,894		38,686
Purchased options (time deposit)	Level 2	1,027		1,175
Liabilities
Interest rate-related instruments	Level 2	$	62,141	$	28,035
Foreign currency exchange forwards	Level 2	3,091		2,339
Forward commitments to sell residential mortgage loans	Level 3	919		313
Commodity contracts	Level 2	66,380		37,286
Written options (time deposit)	Level 2	1,027		1,175

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The table below presents a rollforward of the balance sheet amounts for the six months ended June 30, 2018 and the year ended December 31, 2017, 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, 2016	$	200		$	3,114
Total net gains (losses) included in income
Mortgage derivative gain (loss)	—			(1,889		)
Transfer out of level 3 securities (a)	(200		)	—
Balance December 31, 2017	$	—		$	1,225
Total net gains (losses) included in income
Mortgage derivative gain (loss)	—			1,147
Balance June 30, 2018	$	—		$	2,372

(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 basis as of June 30, 2018, 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, 2018, the closing ratio was 85%.

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 is based on a discounted cash flow analysis, 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, 2018, 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. 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 assets 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, 2018
Assets
Impaired loans(a)	Level 3	$	52,972	Provision for credit losses(b)	$	(12,431	)
Other real estate owned(c)	Level 2	1,954		Foreclosure / OREO expense, net	(808		)
Mortgage servicing rights	Level 3	84,585		Mortgage banking, net	607
December 31, 2017
Assets
Impaired loans(a)	Level 3	$	92,534	Provision for credit losses(b)	$	(32,159	)
Other real estate owned(c)	Level 2	2,604		Foreclosure / OREO expense, net	(939		)
Mortgage servicing rights	Level 3	64,387		Mortgage banking, net	(175		)

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

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

(c) If the fair value of the collateral exceeds the carrying amount of the asset, no charge-off or adjustment is necessary, the asset is not considered to be carried at fair value, and is therefore not included in the table.

44

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 Corporation'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, 2018
Mortgage servicing rights	Discounted cash flow	Discount rate	11%
Mortgage servicing rights	Discounted cash flow	Constant prepayment rate	9%
Impaired Loans	Appraisals / Discounted cash flow	Collateral / Discount factor	24%

Fair Value of Financial Instruments

The Corporation is required to disclose estimated fair values for its financial instruments.

Fair value estimates are set forth below for the Corporation’s financial instruments.

		June 30, 2018				December 31, 2017
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		($ in Thousands)
Financial assets
Cash and due from banks	Level 1	$	396,761	$	396,761	$	483,666	$	483,666
Interest-bearing deposits in other financial institutions	Level 1	71,462		71,462		199,702		199,702
Federal funds sold and securities purchased under agreements to resell	Level 1	3,150		3,150		32,650		32,650
Investment securities held to maturity	Level 2	2,602,247		2,560,943		2,282,853		2,283,574
Investment securities available for sale	Level 1	2,609		2,609		2,628		2,628
Investment securities available for sale	Level 2	4,259,042		4,259,042		4,040,818		4,040,818
FHLB and Federal Reserve Bank stocks	Level 2	249,040		249,040		165,331		165,331
Residential loans held for sale	Level 2	143,022		143,022		85,544		85,544
Loans, net	Level 3	22,724,184		22,282,282		20,519,111		20,314,984
Bank and corporate owned life insurance	Level 2	659,592		659,592		591,057		591,057
Derivatives (trading and other assets)	Level 2	136,342		136,342		70,850		70,850
Derivatives (trading and other assets)	Level 3	3,287		3,287		1,538		1,538
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	21,088,538	$	21,088,538	$	20,436,893	$	20,436,893
Brokered CDs and other time deposits	Level 2	2,727,776		2,727,776		2,349,069		2,349,069
Short-term funding	Level 2	626,525		626,525		676,282		676,282
Long-term funding	Level 2	4,925,476		4,921,348		3,397,450		3,411,368
Standby letters of credit(a)	Level 2	2,549		2,549		2,402		2,402
Derivatives (trading and other liabilities)	Level 2	132,639		132,639		68,835		68,835
Derivatives (trading and other liabilities)	Level 3	919		919		313		313

(a) The commitment on standby letters of credit was $256 million and $235 million at June 30, 2018 and December 31, 2017, respectively. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

45

Note 14 Retirement Plans

The Corporation has a noncontributory defined benefit retirement plan (the Retirement Account Plan (“RAP”)) covering substantially all employees who meet participation requirements. 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.

Bank Mutual was acquired on February 1, 2018. The Bank Mutual Pension Plan has not yet been merged into the Corporation's Retirement Account Plan. However, Bank Mutual's Postretirement Plan was merged into the Corporation's Postretirement Plan during the first quarter of 2018.

The components of net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for three and six months ended June 30, 2018 and 2017 were as follows.

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in Thousands)
Components of Net Periodic Benefit Cost
RAP
Service cost	$	1,893		$	1,782		$	3,785		$	3,563
Interest cost	1,660			1,756			3,320			3,512
Expected return on plan assets	(4,755		)	(4,882		)	(9,510		)	(9,763		)
Amortization of prior service cost	(19		)	(18		)	(38		)	(37		)
Amortization of actuarial loss	463			487			925			975
Total net pension cost	$	(759	)	$	(875	)	$	(1,518	)	$	(1,750	)
Bank Mutual Pension Plan(a)
Interest cost	$	650		N/A			$	1,083		N/A
Expected return on plan assets	(1,060		)	N/A			(1,592		)	N/A
Total net pension cost	$	(410	)	N/A			$	(509	)	N/A
Postretirement Plan(b)
Interest cost	$	27		$	24		$	53		$	48
Amortization of prior service cost	(19		)	(19		)	(38		)	(38		)
Amortization of actuarial loss	2			—			4			—
Total net periodic benefit cost	$	10		$	5		$	19		$	10

(a)   The reported figures only include five months of expense due to the timing of the Bank Mutual acquisition. See Note 2 for additional information on the Bank Mutual acquisition.

(b) The portion of the Postretirement Plan attributed to Bank Mutual's Postretirement Plan only includes five months of expense due to the timing of the Bank Mutual acquisition. See Note 2 for additional information on the Bank Mutual acquisition.

The components of net periodic benefit cost, other than the service cost component, are included in the line item "other" of noninterest expense in the Consolidated Statements of Income.

The Corporation’s funding policy is to pay at least the minimum amount required by federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its pension plans. The Corporation made a $31 million contribution to the Bank Mutual Pension Plan during the second quarter of 2018.

Note 15 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 2017 Annual Report on Form 10-K, with certain exceptions. The more significant of these exceptions are described herein.

46

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 2017 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 2017 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). In addition, the Risk Management and Shared Services segment includes certain unallocated expenses related to Bank Mutual's shared services and operations prior to system conversion in late June 2018.

Information about the Corporation’s segments is presented below.

47

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, 2018
Net interest income	$	203,287		$	218,163		$	14,783		$	436,233
Noninterest income	26,876			150,286			6,059			183,222
Total revenue	230,163			368,449			20,842			619,455
Credit provision(a)	21,723			9,846			(27,569		)	4,000
Noninterest expense	81,025			265,700			77,498			424,223
Income (loss) before income taxes	127,415			92,904			(29,087		)	191,232
Income tax expense (benefit)	24,880			19,510			(11,806		)	32,583
Net income	$	102,535		$	73,394		$	(17,280	)	$	158,648
Return on average allocated capital (ROCET1)(b)	17.2		%	22.8		%	(7.5		)%	12.7		%
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(a)	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)(b)	12.6		%	13.1		%	1.1		%	10.6		%

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 2018
Average earning assets	$	11,729,745	$	10,271,021	$	7,849,775	$	29,850,541
Average loans	11,718,236		10,267,066		559,238		22,544,539
Average deposits	7,838,409		13,418,283		2,391,868		23,648,560
Average allocated capital (CET1)(b)	$	1,204,160	$	648,032	$	587,297	$	2,439,489
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)(b)	$	1,120,082	$	582,706	$	378,104	$	2,080,892

(a) The consolidated credit provision is equal to the actual reported provision for credit losses.

(b) The Federal Reserve establishes capital adequacy requirements for the Corporation, including common equity Tier 1. For segment reporting purposes, the return on common equity Tier 1 ("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.

48

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, 2018
Net interest income	$	107,330		$	114,620		$	4,413		$	226,362
Noninterest income	14,194			76,250			2,399			92,842
Total revenue	121,524			190,870			6,812			319,204
Credit provision(a)	11,126			4,880			(12,006		)	4,000
Noninterest expense	41,775			138,553			30,929			211,258
Income (loss) before income taxes	68,623			47,437			(12,111		)	103,947
Income tax expense (benefit)	13,454			9,962			(8,661		)	14,754
Net income (loss)	$	55,169		$	37,475		$	(3,450	)	$	89,192
Return on average allocated capital (ROCET1)(b)	17.9		%	22.7		%	(3.9		)%	14.0		%
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(a)	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)(b)	12.5		%	11.0		%	4.5		%	10.6		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended June 30, 2018
Average earning assets	$	12,066,538	$	10,402,680	$	7,943,487	$	30,412,705
Average loans	12,054,347		10,399,458		551,624		23,005,428
Average deposits	7,621,977		13,736,251		2,288,021		23,646,250
Average allocated capital (CET1)(b)	$	1,236,918	$	663,172	$	588,411	$	2,488,501
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)(b)	$	1,125,494	$	588,880	$	385,451	$	2,099,825

(a) The consolidated credit provision is equal to the actual reported provision for credit losses.

(b) 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.

49

Note 16 Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) at June 30, 2018 and 2017 respectively, including changes during the preceding six and three month periods as well as any reclassifications out of accumulated other comprehensive income (loss).

($ in Thousands)	Investment Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2018	$	(38,453	)	$	(24,305	)	$	(62,758	)
Other comprehensive income (loss) before reclassifications	(60,754		)	—			(60,754		)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	2,015			—			2,015
Personnel expense	—			(76		)	(76		)
Other expense	—			929			929
Adjustment for adoption of ASU 2016-01	(84		)	—			(84		)
Adjustment for adoption of ASU 2018-02	(8,419		)	(5,235		)	(13,654		)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(632		)	—			(632		)
Income tax (expense) benefit	15,340			(216		)	15,124
Net other comprehensive income (loss) during period	(52,533		)	(4,597		)	(57,130		)
Balance June 30, 2018	$	(90,986	)	$	(28,902	)	$	(119,888	)
Balance January 1, 2017	$	(20,079	)	$	(34,600	)	$	(54,679	)
Other comprehensive income (loss) before reclassifications	3,632			—			3,632
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—			(75		)	(75		)
Other expense	—			975			975
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(2,575		)	—			(2,575		)
Income tax (expense) benefit	(406		)	(342		)	(748		)
Net other comprehensive income (loss) during period	651			558			1,209
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)

50

	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2018	$	(78,453	)	$	(29,220	)	$	(107,673	)
Other comprehensive income (loss) before reclassifications	(18,919		)	—			(18,919		)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	2,015			—			2,015
Personnel expense	—			(38		)	(38		)
Other expense	—			465			465
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(335		)	—			(335		)
Income tax (expense) benefit	4,705			(109		)	4,596
Net other comprehensive income (loss) during period	(12,533		)	318			(12,215		)
Balance June 30, 2018	$	(90,986	)	$	(28,902	)	$	(119,888	)
Balance April 1, 2017	$	(22,023	)	$	(34,321	)	$	(56,344	)
Other comprehensive income (loss) before reclassifications	5,744			—			5,744
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—			(37		)	(37		)
Other expense	—			487			487
Interest income (Amortization of net unrealized losses (gains)on available for sale securities transferred to held to maturity securities)	(1,548		)	—			(1,548		)
Income tax (expense) benefit	(1,601		)	(171		)	(1,772		)
Net other comprehensive income (loss) during period	2,595			279			2,874
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)

51

Note 17 Revenues

On January 1, 2018, the Corporation adopted Topic 606 using the modified retrospective method. As stated in Note 3, the implementation of the new standard had an immaterial impact to the Corporation. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606.

Revenue is recognized when obligations under the terms of a contract with the Corporation's customer are satisfied. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. We do not have any material significant payment terms as payment is received at or shortly after the satisfaction of the performance obligation.

The following table disaggregates the Corporation's revenue by major source for the three and six months ended June 30, 2018 and June 30, 2017.

Six Months Ended June 30, 2018
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	46,612	$	32	46,644
Service charges and deposit account fees	8,011			24,773		25		32,810
Card-based and loan fees(a)	674			19,691		67		20,432
Trust and asset management fees	—			26,806		—		26,806
Brokerage commissions and fees	—			13,902		267		14,169
Other revenue	(170		)	4,763		98		4,692
Noninterest Income (in-scope of Topic 606)	8,515			136,547		490		145,553
Noninterest Income (out-of-scope of Topic 606)	18,361			13,739		5,570		37,670
Total Noninterest Income	26,876			150,286		6,059		183,222
(a) Loan fees are out-of-scope of Topic 606.
Six Months Ended June 30, 2017
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	42,473	$	—	$	42,473
Service charges and deposit account fees	8,511			23,826		49		32,386
Card-based and loan fees(a)	592			16,973		11		17,575
Trust and asset management fees	—			24,281		—		24,281
Brokerage commissions and fees	—			8,679		—		8,679
Other revenue	82			4,315		105		4,502
Noninterest Income (in-scope of Topic 606)	9,184			120,547		165		129,896
Noninterest Income (out-of-scope of Topic 606)	15,306			10,132		6,906		32,344
Total Noninterest Income	24,490			130,679		7,072		162,241
(a) Loan fees are out-of-scope of Topic 606.

52

Three Months Ended June 30, 2018
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	23,988	$	7	$	23,996
Service charges and deposit account fees	3,786			12,590		13		16,390
Card-based and loan fees(a)	358			10,162		42		10,562
Trust and asset management fees	—			13,437		—		13,437
Brokerage commissions and fees	—			6,870		26		6,896
Other revenue	(825		)	2,302		68		1,545
Noninterest Income (in-scope of Topic 606)	3,320			69,349		156		72,825
Noninterest Income (out-of-scope of Topic 606)	10,874			6,901		2,242		20,017
Total Noninterest Income	14,194			76,250		2,399		92,842
(a) Loan fees are out-of-scope of Topic 606.
Three Months Ended June 30, 2017
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	20,853	$	—	$	20,853
Service charges and deposit account fees	4,070			11,938		23		16,030
Card-based and loan fees(a)	320			8,829		5		9,154
Trust and asset management fees	—			12,346		—		12,346
Brokerage commissions and fees	—			4,346		—		4,346
Other revenue	37			2,196		53		2,286
Noninterest Income (in-scope of Topic 606)	4,426			60,507		81		65,014
Noninterest Income (out-of-scope of Topic 606)	8,071			5,302		4,022		17,395
Total Noninterest Income	12,497			65,809		4,104		82,410
(a) Loan fees are out-of-scope of Topic 606.

During the first quarter of 2018, the Corporation acquired Bank Mutual. This acquisition resulted in increased service charges and deposit account fees and card-based and loan fees. In addition, the Corporation acquired Whitnell & Co., Diversified, and Anderson since the second quarter of 2017 which resulted in increased insurance commissions and fees, trust and asset management fees, and brokerage commissions.

53

Below is a listing of performance obligations for the Corporation's main revenue streams.

Revenue Stream	Noninterest income in-scope of Topic 606
Insurance commissions and fees	The Corporation's insurance revenue has two distinct performance obligations. The first performance obligation is the selling of the policy as an agent for the carrier. This performance obligation is satisfied upon binding of the policy. The second performance obligation is the ongoing servicing of the policy which is satisfied over the life of the policy. For employee benefits, the payment is typically received monthly. For property and casualty, payments can vary, but are typically received at, or in advance, of the policy period.
Service charges and deposit account fees	Service charges on deposit accounts consist of monthly service fees (i.e. business analysis fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts.
Card-based and loan fees(a)	Card-based and loan fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month.
Trust and asset management fees	Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered.
Brokerage commissions and fees	Brokerage commissions and fees primarily consists of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service.

(a) Loan fees are out-of-scope of Topic 606.

Arrangements with Multiple Performance Obligations

The Corporation's contracts with customers may include multiple performance obligations. For such arrangements, we allocate revenue to each performance obligation based on its relative standalone selling price. We generally determine standalone selling prices based on the expected cost plus margin.

Practical Expedients

We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

Using the practical expedient, for contracts with a term of one year or less, the Corporation recognizes incremental costs of obtaining those contracts as an expense when incurred.

54

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 ("SEC"), 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, 2017, in the Corporation's Quarterly Report on Form 10-Q for the quarter ended March 31, 2018, 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 Quarterly Report on 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. Within the tables presented, certain columns and rows may not sum due to the use of rounded numbers for disclosure purposes.

Recent Legislative Developments

On May 24, 2018, the President signed into law the Economic Growth, Regulatory Relief, and Consumer Protection Act (“Economic Growth Act”), which repealed or modified several important provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (“Dodd-Frank Act”) that have impacted us. Key aspects of the Economic Growth Act that have the potential to affect our business and the results of our operations include:

• Raising the total asset threshold from $10 billion to $250 billion at which bank holding companies are required to conduct annual company-run stress tests mandated by the Dodd-Frank Act;

• Raising the total asset threshold from $10 billion to $50 billion at which publicly traded bank holding companies are required to establish risk committees for the oversight of the enterprise-wide risk management practices of the institution;

• Raising the total asset threshold from $50 billion to $250 billion at which bank holding companies would be subject to annual supervisory stress tests;

• Raising the total asset threshold for enhanced prudential supervision by the Board of Governors of the Federal Reserve System (“Federal Reserve Board”) from $50 billion to $250 billion, which had resulted in enhanced prudential standards in the areas of risk-based capital and leverage limits, liquidity requirements, and resolution planning (preparation of so-called “living wills”). Under the amended provisions, the Federal Reserve Board retains discretion to subject bank holding companies with more than $100 billion in assets to enhanced supervision.

To the extent we grow our balance sheet organically or through strategic opportunities, the Corporation expects to benefit significantly from the amendments which raised the above asset thresholds. In addition, although the Corporation will continue to monitor and stress test its capital consistent with the safety and soundness expectations of the federal regulators, the Corporation will no longer conduct company-run stress testing as a result of the legislative amendments.

55

The Economic Growth Act also enacted several important changes in some technical compliance areas that we believe will help reduce our regulatory burden, including:

• Prohibiting federal banking regulators from imposing higher capital standards on High Volatility Commercial Real Estate (“HVCRE”) exposures unless they are for acquisition, development or construction (“ADC”), and clarifying ADC status;

• Requiring the federal banking agencies to amend the Liquidity Coverage Ratio Rule such that all qualifying investment-grade, liquid and readily-marketable municipal securities are treated as level 2B liquid assets, making them more attractive investment alternatives;

• Exempting from appraisal requirements certain transactions involving real property in rural areas and valued at less than $400,000; and

• Directing the Bureau of Consumer Financial Protection to provide guidance on the applicability of the TILA-RESPA Integrated Disclosure rule to mortgage assumption transactions and construction-to-permanent home loans, as well the extent to which lenders can rely on model disclosures that do not reflect recent regulatory changes.

Despite the improvements for mid-size financial institutions such as the Corporation that has resulted from the Economic Growth Act, many provisions of the Dodd-Frank Act and its implementing regulations remain in place and will continue to result in additional operating and compliance costs that could have a material adverse effect on our business, financial condition, results of operation. In addition, the Economic Growth Act requires the enactment of a number of implementing regulations, the details of which may have a material effect on the ultimate impact of the law.

56

Performance Summary

• Average loans of $22.5 billion increased $2.2 billion, or 11%, from the first six months of 2017. Average deposits of $23.6 billion increased $2.2 billion, or 10%, from the first six months of 2017. For the remainder of 2018, the Corporation expects 1% to 2% quarterly loan growth and to maintain the loan to deposit ratio under 100%.

• Net interest income of $436 million increased $72 million, or 20%, from the first six months of 2017. Net interest margin was 2.97%, compared to 2.83% for the first six months of 2017. For the remainder of 2018, the Corporation expects an improving year over year net interest margin.

• Provision for credit losses was $4 million, down from $21 million the first six months of 2017. For the remainder of 2018, the Corporation expects the provision for credit losses will change based on changes in risk grade or other indicators of credit quality, and loan volume.

• Noninterest income of $183 million was up $21 million, or 13% from the first six months of 2017. For 2018, the Corporation expects noninterest income of approximately $365 million to $370 million.

• Noninterest expense of $424 million including $28 million of acquisition related costs pertaining to Bank Mutual, was up $74 million, or 21% compared to the first six months 2017. For 2018, the Corporation expects noninterest expense to be approximately $825 million, which includes the Diversified and Anderson acquisitions and all costs related to Bank Mutual.

• The effective tax rate for the first six months of 2018 was 17.04%, compared to 26.44% for the first six months of 2017. The Corporation expects the effective tax rate to be approximately 22% for the remainder of the year, and approximately 20% for the full year 2018.

Table 1 Summary Results of Operations: Trends

	YTD Jun 2018			YTD Jun 2017			2Q18			1Q18			4Q17			3Q17			2Q17
	($ in Thousands, except per share data)
Net income	$	158,648		$	114,253		$	89,192		$	69,456		$	50,010		$	65,001		$	57,983
Net income available to common equity	153,980			109,584			86,863			67,117			47,671			62,662			55,644
Earnings per common share - basic	0.92			0.72			0.51			0.41			0.31			0.41			0.36
Earnings per common share - diluted	0.90			0.71			0.50			0.40			0.31			0.41			0.36
Effective tax rate	17.04		%	26.44		%	14.19		%	20.43		%	44.34		%	30.55		%	25.58		%

57

Income Statement Analysis

Net Interest Income

Table 2 Net Interest Income Analysis

	Six Months Ended June 30,
	2018						2017
	Average Balance		Interest Income / Expense		Average Yield / Rate		Average Balance		Interest Income / Expense		Average Yield / Rate
	($ in Thousands)
Assets
Earning assets
Loans(a)(b)(c)
Commercial and business lending	$	7,506,399	$	161,476	4.34	%	$	7,260,839	$	126,187	3.50	%
Commercial real estate lending	5,553,469		133,554		4.85	%	4,982,027		92,697		3.75	%
Total commercial	13,059,868		295,030		4.55	%	12,242,866		218,884		3.60	%
Residential mortgage	8,124,546		135,432		3.34	%	6,762,319		109,404		3.24	%
Retail	1,360,125		37,061		5.46	%	1,293,414		31,497		4.88	%
Total loans	22,544,539		467,523		4.17	%	20,298,599		359,785		3.56	%
Investment securities
Taxable	5,547,289		60,727		2.19	%	4,805,819		47,133		1.96	%
Tax-exempt(a)	1,405,561		25,200		3.59	%	1,140,889		24,897		4.36	%
Other short-term investments	353,152		5,330		3.04	%	297,747		3,089		2.09	%
Investments and other	7,306,003		91,257		2.50	%	6,244,455		75,119		2.41	%
Total earning assets	29,850,541		$	558,780	3.76	%	26,543,054		$	434,904	3.29	%
Other assets, net	2,953,835						2,447,719
Total assets	$	32,804,377					$	28,990,773
Liabilities and Stockholders' Equity
Interest-bearing liabilities
Interest-bearing deposits
Savings	$	1,808,207	$	412	0.05	%	$	1,503,678	$	389	0.05	%
Interest-bearing demand	4,620,383		17,736		0.77	%	3,822,996		8,001		0.42	%
Money market	7,202,684		21,830		0.61	%	6,070,492		8,748		0.29	%
Network transaction deposits	2,269,000		18,281		1.62	%	3,485,279		14,119		0.82	%
Time	2,639,731		13,585		1.04	%	1,683,177		6,849		0.82	%
Total interest-bearing deposits	18,540,005		71,843		0.78	%	16,565,621		38,104		0.46	%
Federal funds purchased and securities sold under agreements to repurchase	267,602		1,060		0.80	%	492,425		1,339		0.55	%
Other short-term funding	69,654		111		0.32	%	107,035		169		0.32	%
FHLB advances	4,275,753		34,402		1.62	%	3,007,025		11,596		0.78	%
Long-term funding	497,433		9,088		3.65	%	496,755		9,088		3.66	%
Total short and long-term funding	5,110,442		44,661		1.76	%	4,103,240		22,192		1.09	%
Total interest-bearing liabilities	23,650,448		$	116,504	0.99	%	20,668,861		$	60,296	0.59	%
Noninterest-bearing demand deposits	5,108,554						4,928,973
Other liabilities	415,683						248,559
Stockholders’ equity	3,629,692						3,144,380
Total liabilities and stockholders’ equity	$	32,804,377					$	28,990,773
Interest rate spread					2.77	%					2.70	%
Net free funds					0.20	%					0.13	%
Fully tax-equivalent net interest income and net interest margin			$	442,277	2.97	%			$	374,608	2.83	%
Fully tax-equivalent adjustment			6,043						10,515
Net interest income			$	436,233					$	364,093

(a) Beginning in 2018, the yield on tax-exempt loans and securities is computed on a fully tax-equivalent basis using a tax rate of 21% and is net of the effects of certain disallowed interest deductions. Prior to 2018, the yield on tax-exempt loans and securities was computed on a fully tax-equivalent basis using a tax rate of 35% and was net of the effects of certain disallowed interest deductions.

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

(c) Interest income includes net deferred loan origination costs and net accreted purchase loan discount.

58

Table 2 Net Interest Income Analysis (continued)

	Quarter ended
	June 30, 2018						March 31, 2018						June 30, 2017
	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(a)(b)(c)
Commercial and business lending	$	7,697,057	$	86,771	4.52	%	$	7,313,621	$	74,706	4.14	%	$	7,321,523	$	65,507	3.59	%
Commercial real estate lending	5,705,817		72,049		5.06	%	5,399,429		61,504		4.62	%	4,964,257		47,562		3.84	%
Total commercial	13,402,874		158,820		4.75	%	12,713,050		136,210		4.34	%	12,285,780		113,069		3.69	%
Residential mortgage	8,237,457		69,030		3.35	%	8,010,381		66,402		3.32	%	6,957,865		56,097		3.23	%
Retail	1,365,097		19,210		5.63	%	1,355,098		17,852		5.29	%	1,278,345		16,048		5.03	%
Total loans	23,005,428		247,060		4.30	%	22,078,529		220,464		4.03	%	20,521,990		185,214		3.62	%
Investment securities
Taxable	5,518,077		30,623		2.22	%	5,576,826		30,104		2.16	%	4,781,488		23,658		1.98	%
Tax-exempt(a)	1,497,192		13,587		3.63	%	1,312,913		11,613		3.54	%	1,143,736		12,459		4.36	%
Other short-term investments	392,009		3,153		3.22	%	313,864		2,177		2.80	%	297,341		1,553		2.09	%
Investments and other	7,407,277		47,363		2.56	%	7,203,603		43,894		2.44	%	6,222,565		37,670		2.42	%
Total earning assets	30,412,705		$	294,423	3.88	%	29,282,132		$	264,358	3.64	%	26,744,555		$	222,884	3.34	%
Other assets, net	3,022,659						2,884,248						2,454,351
Total assets	$	33,435,364					$	32,166,380					$	29,198,906
Liabilities and Stockholders' equity
Interest-bearing liabilities
Interest-bearing deposits
Savings	$	1,892,808	$	210	0.04	%	$	1,722,665	$	202	0.05	%	$	1,541,129	$	201	0.05	%
Interest-bearing demand	4,735,514		9,918		0.84	%	4,503,974		7,818		0.70	%	3,824,759		4,401		0.46	%
Money market	7,190,178		12,045		0.67	%	7,215,329		9,785		0.55	%	6,135,222		4,851		0.32	%
Network transaction deposits	2,130,854		9,503		1.79	%	2,408,681		8,778		1.48	%	3,377,513		8,017		0.95	%
Time deposits	2,565,001		6,755		1.06	%	2,715,292		6,830		1.02	%	1,752,255		3,710		0.85	%
Total interest-bearing deposits	18,514,355		38,431		0.83	%	18,565,941		33,412		0.73	%	16,630,878		21,180		0.51	%
Federal funds purchased and securities sold under agreements to repurchase	259,713		538		0.83	%	275,578		522		0.77	%	489,571		824		0.67	%
Other short-term funding	65,631		51		0.31	%	73,722		60		0.33	%	105,558		84		0.32	%
FHLB advances	4,809,071		21,279		1.77	%	3,736,510		13,123		1.42	%	3,172,254		7,149		0.90	%
Long-term funding	497,517		4,544		3.65	%	497,348		4,544		3.66	%	496,841		4,544		3.66	%
Total short and long-term funding	5,631,932		26,412		1.88	%	4,583,158		18,249		1.61	%	4,264,224		12,601		1.18	%
Total interest-bearing liabilities	24,146,287		$	64,843	1.08	%	23,149,099		$	51,661	0.90	%	20,895,102		$	33,781	0.65	%
Noninterest-bearing demand deposits	5,131,894						5,084,957						4,892,271
Other liabilities	436,130						395,008						246,395
Stockholders’ equity	3,721,053						3,537,316						3,165,138
Total liabilities and stockholders’ equity	$	33,435,364					$	32,166,380					$	29,198,906
Interest rate spread					2.80	%					2.74	%					2.69	%
Net free funds					0.22	%					0.18	%					0.14	%
Fully tax-equivalent net interest income and net interest margin			$	229,580	3.02	%			$	212,697	2.92	%			$	189,103	2.83	%
Fully tax-equivalent adjustment			3,217						2,826						5,284
Net interest income			$	226,362					$	209,871					$	183,819

(a) Beginning in 2018, the yield on tax-exempt loans and securities is computed on a fully tax-equivalent basis using a tax rate of 21% and is net of the effects of certain disallowed interest deductions. Prior to 2018, the yield on tax-exempt loans and securities was computed on a fully tax-equivalent basis using a tax rate of 35% and was net of the effects of certain disallowed interest deductions.

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

(c) Interest income includes amortization of net deferred loan origination costs and net accreted purchase loan discount.

59

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 $436 million for the first six months of 2018 compared to $364 million for the first six months of 2017. The primary reason for increased net interest income and earning assets from last year was the acquisition of Bank Mutual in February 2018. 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 $442 million for the first six months of 2018 was $68 million higher than the first six months of 2017.

• Accreted income from the acquisition of the Bank Mutual loan portfolio contributed $15 million to net interest income for the first six months of 2018. Approximately $7 million of the accreted income was from prepayments.

• Average earning assets of $29.9 billion for the first six months of 2018 were $3.3 billion, or 12%, higher than the first six months of 2017. Average loans of $22.5 billion for the first six months of 2018 increased $2.2 billion, or 11% primarily due to an increase of $1.4 billion, or 20% in residential mortgage loans.

• Average interest-bearing liabilities of $23.7 billion for the first six months of 2018 were up $3.0 billion, or 14% versus the first six months of 2017. On average, interest-bearing deposits increased $2.0 billion and FHLB advances increased $1.3 billion from the first six months of 2017.

• The net interest margin for the first six months of 2018 was 2.97%, compared to 2.83% for the first six months of 2017.

• The cost of interest-bearing liabilities was 0.99% for the first six months of 2018, which was 40 bps higher than the first six months of 2017. The increase was primarily due to a 32 bp increase in the cost of average interest-bearing deposits (to 0.78%) and a 84 bp increase in the cost of FHLB advances (to 1.62%), both primarily due to increases in the Federal Reserve interest rate.

• The Federal Reserve increased the targeted federal funds rate on June 13, 2018, to a range of 1.75% to 2.00% which compares to a range of 1.00% to 1.25% at the end of the second quarter of 2017. The Federal Reserve has indicated that it 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, 2018 was $4 million, compared to $21 million for the six months ended June 30, 2017. Net charge offs were $18 million (representing 0.16% of average loans) for the six months ended June 30, 2018, compared to $18 million (representing 0.18% of average loans) for the six months ended June 30, 2017. The ratio of the allowance for loan losses to total loans was 1.10% for June 30, 2018 and 1.35% for June 30, 2017.

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.

60

Noninterest Income

Table 3 Noninterest Income

																								2Q18 Change vs
($ in Thousands)	YTD 2018			YTD 2017			% Change		2Q18			1Q18			4Q17			3Q17			2Q17			1Q18		2Q17
Insurance commissions and fees	$	46,644		$	42,473		10	%	$	23,996		$	22,648		$	19,186		$	19,815		$	20,853		6	%	15	%
Service charges and deposit account fees	32,810			32,386			1	%	16,390			16,420			15,773			16,268			16,030			—	%	2	%
Card-based and loan fees	27,809			26,229			6	%	14,387			13,422			13,840			12,619			13,764			7	%	5	%
Trust and asset management fees	26,806			24,281			10	%	13,437			13,369			13,125			12,785			12,346			1	%	9	%
Brokerage commissions and fees	14,169			8,679			63	%	6,896			7,273			6,864			4,392			4,346			(5	)%	59	%
Total core fee-based revenue	148,238			134,048			11	%	75,106			73,132			68,788			65,879			67,339			3	%	12	%
Mortgage banking income	16,670			14,965			11	%	8,451			8,219			5,507			9,147			7,692			3	%	10	%
Mortgage servicing rights expense	4,042			5,359			(25	)%	2,193			1,849			2,337			2,563			2,665			19	%	(18	)%
Mortgage banking, net	12,628			9,606			31	%	6,258			6,370			3,169			6,585			5,027			(2	)%	24	%
Capital markets, net	10,089			7,925			27	%	4,783			5,306			7,107			4,610			4,042			(10	)%	18	%
Bank and corporate owned life insurance	7,165			6,514			10	%	3,978			3,187			3,156			6,580			3,899			25	%	2	%
Other	4,727			4,492			5	%	2,235			2,492			2,777			2,254			2,213			(10	)%	1	%
Subtotal	182,847			162,585			12	%	92,360			90,487			84,997			85,908			82,520			2	%	12	%
Asset gains(losses), net	2,390			(700		)	N/M		2,497			(107		)	(528		)	(16		)	(466		)	N/M		N/M
Investment securities gains(losses), net	(2,015		)	356			N/M		(2,015		)	—			75			3			356			N/M		N/M
Total noninterest income	183,222			162,241			13	%	$	92,842		$	90,380		$	84,544		$	85,895		$	82,410		3	%	13	%
Mortgage loans originated for sale during period	$	516,285		$	220,284		134	%	$	318,682		$	197,603		$	249,222		$	245,851		$	119,004		61	%	168	%
Mortgage loan settlements during period	$	482,080		$	364,128		32	%	$	294,456		$	187,624		$	268,254		$	187,568		$	167,550		57	%	76	%
Assets under management, at market value(a)	$	10,776		$	8,997		20	%	$	10,776		$	10,540		$	10,555		$	9,243		$	8,997		2%		20	%

N/M = Not Meaningful

(a) $ in millions. Excludes assets held in brokerage firms

Notable Contributions to the Change in Noninterest Income

• Fee-based revenue was $148 million, an increase of $14 million (11%) compared to the first six months of 2017. Within fee based revenue, brokerage commissions and fees increased $5 million (63%), primarily due to the acquisition of Whitnell & Co. in the fourth quarter of 2017. In addition, trust and asset management fees increased $3 million (10%), primarily due to an increase in assets under management, and insurance commissions and fees increased $4 million (10%), primarily due to the acquisition of Diversified and Anderson in the first and second quarters of 2018, respectively.

• Net mortgage banking income for the first six months of 2018 was $13 million, up $3 million (31%) from the first six months of 2017, primarily due to the Corporation's strategy to hold mortgages on balance sheet during 2017.

• Capital markets, net increased $2 million (27%) compared to the first six months of 2017, primarily driven by higher customer hedging transactions and increased syndication activity.

• During the second quarter of 2018, the Corporation had $2 million of asset gains primarily driven by a distribution from an alternative equity investment.

• During the second quarter of 2018, the Corporation recorded a $2 million loss on the sale of investment securities related to the sale of two lower yielding GNMA commercial mortgage-related securities.

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Noninterest Expense

Table 4 Noninterest Expense

																	2Q18 Change vs
($ in Thousands)	YTD 2018		YTD 2017		YTD % Change		2Q18		1Q18		4Q17		3Q17		2Q17		1Q18		2Q17
Personnel	$	241,665	$	213,848	13	%	$	123,980	$	117,685	$	107,031	$	108,098	$	107,066	5	%	16	%
Occupancy	30,428		28,051		8	%	15,071		15,357		13,497		12,294		12,832		(2	)%	17	%
Technology	37,167		29,893		24	%	19,452		17,715		17,878		15,233		15,473		10	%	26	%
Equipment	11,509		10,719		7	%	5,953		5,556		5,250		5,232		5,234		7	%	14	%
Business development and advertising	13,760		12,987		6	%	7,067		6,693		8,195		7,764		7,152		6	%	(1	)%
Legal and professional	11,697		9,877		18	%	6,284		5,413		6,384		6,248		5,711		16	%	10	%
Card Issuance and loan costs	6,477		5,594		16	%	3,173		3,304		2,836		3,330		2,974		(4	)%	7	%
Foreclosure / OREO expense, net	1,744		2,687		(35	)%	1,021		723		1,285		906		1,182		41	%	(14	)%
FDIC assessment	16,500		16,000		3	%	8,250		8,250		7,500		7,800		8,000		—	%	3	%
Other intangible amortization	3,693		1,009		N/M		2,168		1,525		500		450		496		42	%	N/M
Acquisition related costs(a)	27,712		—		N/M		7,107		20,605		—		—		—		(66	)%	N/M
Other	21,873		19,342		13	%	11,732		10,140		11,343		10,072		10,196		16	%	15	%
Total noninterest expense	$	424,223	$	350,007	21	%	$	211,258	$	212,965	$	181,699	$	177,427	$	176,316	(1	)%	20	%

N/M = Not Meaningful

(a) Includes Bank Mutual acquisition-related costs only.

Notable Contributions to the Change in Noninterest Expense

• Personnel expense (which includes salary-related expenses and fringe benefit expenses) was $242 million for the first six months of 2018, up $28 million (13%) from the first six months of 2017, primarily driven by the additional cost of Bank Mutual staff and an increase in the management incentive plan.

• All other nonpersonnel noninterest expense on a combined basis was $183 million, up $46 million compared to the first six months of 2017. The increase was primarily driven by $28 million of acquisition related costs pertaining to Bank Mutual. In addition, technology expense increased $7 million (24%) from the first six months of 2017, driven by the additional cost of Bank Mutual operations.

Income Taxes

The Corporation recognized income tax expense of $33 million for the six months ended June 30, 2018, compared to income tax expense of $41 million for the six months ended June 30, 2017. The decrease is primarily due to the Tax Cut and Jobs Act ("TCJA") signed into law on December 22, 2017. In the second quarter, the Corporation received one-time tax benefits from implementing tax planning strategies to maximize the positive impact of the TCJA. The effective tax rate was 17.04% for the first six months of 2018, compared to an effective tax rate of 26.44% for the first six months of 2017.

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 2017 Annual Report on Form 10-K for additional information on income taxes.

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Balance Sheet Analysis

• At June 30, 2018, total assets were $33.7 billion, up $3.2 billion (10%) from December 31, 2017 and up $3.9 billion (13%) from June 30, 2017. On February 1, 2018, the Corporation added $2.8 billion of assets as a result of the Bank Mutual acquisition.

• Loans of $23.0 billion at June 30, 2018 were up $2.2 billion (11%) from December 31, 2017 and were up $2.2 billion (11%) from June 30, 2017. On February 1, 2018, the Corporation added $1.9 billion of loans as a result of the Bank Mutual acquisition. See section Loans for additional information on loans.

• At June 30, 2018, total deposits of $23.8 billion were up $1.0 billion (5%) from December 31, 2017 and were up $2.2 billion (10%) from June 30, 2017. On February 1, 2018, the Corporation assumed $1.8 billion of deposits as a result of the Bank Mutual acquisition. These inflows were partially offset by seasonal deposit outflows. See section Deposits and Customer Funding for additional information on deposits.

• FHLB advances of $4.8 billion increased $1.6 billion (51%) from December 31, 2017 and increased $1.3 billion (39%) from June 30, 2017. The increase in FHLB advances replaced seasonal deposit outflows and provided funding for incremental asset growth. Other short and long-term funding, excluding FHLB advances, of $754 million decreased $135 million (15%) from December 31, 2017 and decreased $448 million (37%) from June 30, 2017.

Loans

Table 5 Period End Loan Composition

	June 30, 2018				March 31, 2018				December 31, 2017				September 30, 2017				June 30, 2017
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
	($ in Thousands)
Commercial and industrial	$	7,109,796	31	%	$	6,756,983	30	%	$	6,399,693	31	%	$	6,534,660	31	%	$	6,571,000	32	%
Commercial real estate — owner occupied	888,330		4	%	900,913		4	%	802,209		4	%	827,064		4	%	845,336		4	%
Commercial and business lending	7,998,126		35	%	7,657,896		34	%	7,201,902		35	%	7,361,724		35	%	7,416,336		36	%
Commercial real estate — investor	3,996,415		17	%	4,077,671		18	%	3,315,254		16	%	3,345,536		16	%	3,329,585		16	%
Real estate construction	1,487,159		6	%	1,579,778		7	%	1,451,684		7	%	1,552,135		8	%	1,651,805		8	%
Commercial real estate lending	5,483,574		24	%	5,657,449		25	%	4,766,938		23	%	4,897,671		24	%	4,981,390		24	%
Total commercial	13,481,700		59	%	13,315,345		58	%	11,968,840		58	%	12,259,395		59	%	12,397,726		60	%
Residential mortgage	8,207,253		36	%	8,197,223		36	%	7,546,534		36	%	7,408,471		35	%	7,115,457		34	%
Home equity	911,363		4	%	923,470		4	%	883,804		4	%	890,130		4	%	897,111		4	%
Other consumer	376,470		2	%	374,453		2	%	385,813		2	%	373,464		2	%	372,775		2	%
Total consumer	9,495,086		41	%	9,495,146		42	%	8,816,151		42	%	8,672,065		41	%	8,385,343		40	%
Total loans	$	22,976,786	100	%	$	22,810,491	100	%	$	20,784,991	100	%	$	20,931,460	100	%	$	20,783,069	100	%

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 2017 and the first six months of 2018. 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 the Corporation's 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, 2018, 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, small businesses and lease financing. At June 30, 2018, the largest industry group within the commercial and business lending category was manufacturing and wholesale trade, which represented 9% of total loans and 25% 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 15% of the total commercial and business lending portfolio at June 30, 2018. 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. At June 30, 2018, the oil and gas portfolio was comprised of 57 credits, totaling $682 million of outstanding balances. 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 diversified by product line with approximately 57% in oil and 43% in gas at June 30, 2018. 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, 2018			March 31, 2018			December 31, 2017			September 30, 2017			June 30, 2017
	($ in Millions)
Pass	$	603		$	548		$	483		$	446		$	411
Special mention	—			—			—			—			39
Potential problem	34			40			40			39			37
Nonaccrual	45			69			77			92			114
Total oil and gas related loans	$	682		$	657		$	600		$	577		$	601
Quarter net charge offs	$	7		$	4		$	—		$	8		$	12
Oil and gas related allowance	$	17		$	19		$	27		$	30		$	33
Oil and gas related allowance ratio	2.5		%	2.9		%	4.5		%	5.2		%	5.4		%

During 2017, the market stabilized leading to improvements across the oil and gas portfolio. At June 30, 2018, nonaccrual oil and gas related loans totaled approximately $45 million, representing 7% of the oil and gas loan portfolio, a decrease of $32 million from December 31, 2017.

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, 2018, the two largest property type exposures within the commercial real estate-investor portfolio were loans secured by multi-family properties, which represented 6% of total loans and 35% of the total commercial real estate-investor portfolio, and loans secured by retail properties, which represented 4% of total loans and 24% of the total commercial real estate-investor portfolio. Credit risk is managed in a similar manner to commercial and business lending by employing sound underwriting guidelines, lending primarily to borrowers in local markets and businesses, periodically evaluating the underlying collateral, and formally reviewing the borrower’s financial soundness and relationship on an ongoing basis.

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

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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 that 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, 2018	Within 1 Year(a)			1-5 Years			After 5 Years			Total			% of Total
	($ in Thousands)
Commercial and industrial	$	6,409,615		$	507,868		$	192,314		$	7,109,796		53	%
Commercial real estate — investor	3,251,035			640,802			104,578			3,996,415			30	%
Commercial real estate — owner occupied	451,573			287,350			149,406			888,330			7	%
Real estate construction	1,370,679			110,071			6,409			1,487,159			11	%
Total	$	11,482,902		$	1,546,091		$	452,707		$	13,481,700		100	%
Fixed rate	$	4,630,936		$	972,613		$	354,526		$	5,958,075		44	%
Floating or adjustable rate	6,851,966			573,478			98,181			7,523,625			56	%
Total	$	11,482,902		$	1,546,091		$	452,707		$	13,481,700		100	%
Percent repricing distribution	85		%	12		%	3		%	100		%

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

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, 2018, the residential mortgage portfolio was comprised of $2.7 billion of fixed-rate residential real estate mortgages and $5.4 billion of variable-rate residential real estate mortgages, compared to $2.6 billion of fixed-rate mortgages and $4.9 billion variable-rate mortgages at December 31, 2017. The residential mortgage portfolio is focused primarily in the Corporation's three-state branch footprint, with approximately 88% of the outstanding loan balances in the Corporation's branch footprint at June 30, 2018. 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.

Based upon outstanding balances at June 30, 2018, the following table presents the next contractual repricing year for the Corporation's adjustable rate mortgage portfolio.

Table 8 Adjustable Rate Mortgage Repricing ^(a) 

	$ in Thousands		% to Total
2018	$	187,044	4	%
2019	669,301		13	%
2020	610,417		12	%
2021	723,320		14	%
2022	773,414		15	%
Thereafter	2,293,420		44	%
Total adjustable rate mortgages	$	5,256,916	100	%

(a) Based on contractual loan terms for 3/1, 5/1, 7/1, and 10/1 adjustable rate mortgages; does not factor in early prepayments or amortization.

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.

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

The Corporation’s underwriting and risk-based pricing guidelines for home equity lines and loans consist of a combination of both borrower FICO and the original cumulative LTV against the property securing the loan.  Currently, the Corporation's 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, 2018, the following table presents the periods when home equity lines of credit revolving periods are scheduled to end.

Table 9 Home Equity Line of Credit - Revolving Period End Dates

	$ in Thousands		% of Total
Less than 5 years	$	68,185	8	%
5 to 10 years	206,893		25	%
Over 10 years	567,236		67	%
Total home equity revolving lines of credit	$	842,314	100	%

Other consumer: Other consumer consists of student loans, short-term and other personal installment loans and credit cards. The Corporation had $175 million and $183 million of student loans at June 30, 2018, and December 31, 2017, 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 10 provides detailed information regarding nonperforming assets, which include nonaccrual loans and other real estate owned, and other nonperforming assets.

Table 10 Nonperforming Assets

	June 30, 2018			March 31, 2018			December 31, 2017			September 30, 2017			June 30, 2017
	($ in Thousands)
Nonperforming assets
Commercial and industrial	$	81,776		$	102,667		$	112,786		$	122,284		$	141,475
Commercial real estate — owner occupied	18,649			20,636			22,740			15,598			15,800
Commercial and business lending	100,425			123,303			135,526			137,882			157,275
Commercial real estate — investor	26,503			15,574			4,729			3,543			7,206
Real estate construction	1,544			1,219			974			1,540			1,717
Commercial real estate lending	28,047			16,793			5,703			5,083			8,923
Total commercial	128,472			140,096			141,229			142,965			166,198
Residential mortgage	62,896			55,100			53,632			54,654			51,975
Home equity	12,958			13,218			13,514			12,639			13,482
Other consumer	134			139			171			259			233
Total consumer	75,988			68,456			67,317			67,552			65,690
Total nonaccrual loans	204,460			208,553			208,546			210,517			231,888
Commercial real estate owned	4,848			7,511			6,735			5,098			4,825
Residential real estate owned	3,715			5,806			5,873			3,385			2,957
Bank properties real estate owned	18,645			3,601			—			—			—
Other real estate owned (“OREO”)	27,207			16,919			12,608			8,483			7,782
Other nonperforming assets	7,059			7,117			7,418			7,418			7,418
Total nonperforming assets (“NPAs”)	$	238,726		$	232,589		$	228,572		$	226,418		$	247,088
Accruing loans past due 90 days or more
Commercial	$	222		$	505		$	418		$	308		$	248
Consumer	1,617			2,888			1,449			1,303			1,287
Total accruing loans past due 90 days or more	$	1,839		$	3,393		$	1,867		$	1,611		$	1,535
Restructured loans (accruing)
Commercial	$	36,852		$	47,460		$	48,735		$	51,259		$	50,634
Consumer	26,871			29,041			25,883			25,919			26,691
Total restructured loans (accruing)	$	63,723		$	76,501		$	74,618		$	77,178		$	77,325
Nonaccrual restructured loans (included in nonaccrual loans)	$	38,005		$	23,827		$	23,486		$	33,520		$	51,715
Ratios
Nonaccrual loans to total loans	0.89		%	0.91		%	1.00		%	1.01		%	1.12		%
NPAs to total loans plus OREO	1.04		%	1.02		%	1.10		%	1.08		%	1.19		%
NPAs to total assets	0.71		%	0.70		%	0.75		%	0.75		%	0.83		%
Allowance for loan losses to nonaccrual loans	123.55		%	123.26		%	127.49		%	131.37		%	121.22		%

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Table 11 Nonperforming Assets (continued)

	June 30, 2018		March 31, 2018		December 31, 2017		September 30, 2017		June 30, 2017
	($ in Thousands)
Accruing loans 30-89 days past due
Commercial and industrial	$	588	$	880	$	271	$	1,378	$	1,255
Commercial real estate — owner occupied	193		511		48		1,522		1,284
Commercial and business lending	781		1,391		319		2,900		2,539
Commercial real estate — investor	828		240		374		1,109		899
Real estate construction	19,765		490		251		700		135
Commercial real estate lending	20,593		730		625		1,809		1,034
Total commercial	21,374		2,121		944		4,709		3,573
Residential mortgage	9,341		15,133		9,552		8,870		9,165
Home equity	7,270		5,868		6,825		7,191		5,924
Other consumer	1,735		1,811		2,007		1,686		1,746
Total consumer	18,346		22,812		18,384		17,747		16,835
Total accruing loans 30-89 days past due	$	39,720	$	24,934	$	19,328	$	22,456	$	20,408
Potential problem loans
Commercial and industrial	$	172,177	$	196,766	$	113,778	$	153,779	$	142,607
Commercial real estate — owner occupied	38,879		34,410		41,997		57,468		60,724
Commercial and business lending	211,056		231,176		155,775		211,247		203,331
Commercial real estate — investor	24,790		46,970		19,291		46,770		48,569
Real estate construction	3,168		1,695		—		118		8,901
Commercial real estate lending	27,958		48,665		19,291		46,888		57,470
Total commercial	239,014		279,841		175,066		258,135		260,801
Residential mortgage	2,355		2,155		1,616		650		1,576
Home equity	142		188		195		124		208
Other consumer	6		—		—		—		—
Total consumer	2,503		2,343		1,811		774		1,784
Total potential problem loans	$	241,517	$	282,184	$	176,877	$	258,909	$	262,585

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, 2018 was 0.89%, as compared to 1.00% at December 31, 2017 and 1.12% at June 30, 2017. 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, 2018 were relatively unchanged from both December 31, 2017 and June 30, 2017.

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.

OREO: Management actively seeks to ensure OREO properties held are monitored to minimize the Corporation’s risk of loss. The increase in OREO during the second quarter of 2018 was primary driven by the closure of Bank Mutual properties.

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Other nonperforming assets: 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 a 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 2017 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 10 provides additional information regarding nonperforming assets, and Table 12 and Table 13 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, 2018 and December 31, 2017 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. Criticized loans 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 12 Allowance for Credit Losses

	YTD
	2018			2017			June 30, 2018			March 31, 2018			December 31, 2017			September 30, 2017			June 30, 2017
	($ in Thousands)
Allowance for Loan Losses
Balance at beginning of period	$	265,880		$	278,335		$	257,058		$	265,880		$	276,551		$	281,101		$	282,672
Provision for loan losses	4,500			21,000			4,000			500			—			6,000			11,000
Charge offs	(27,081		)	(27,230		)	(14,926		)	(12,155		)	(14,289		)	(14,727		)	(15,376		)
Recoveries	9,302			8,996			6,470			2,832			3,618			4,177			2,805
Net charge offs	(17,779		)	(18,234		)	(8,456		)	(9,323		)	(10,671		)	(10,550		)	(12,571		)
Balance at end of period	$	252,601		$	281,101		$	252,601		$	257,058		$	265,880		$	276,551		$	281,101
Allowance for Unfunded Commitments
Balance at beginning of period	$	24,400		$	25,400		$	26,336		$	24,400		$	24,400		$	25,400		$	24,400
Provision for unfunded commitments	(500		)	—			—			(500		)	—			(1,000		)	1,000
Amount recorded at acquisition	2,436			—			—			2,436			—			—			—
Balance at end of period	$	26,336		$	25,400		$	26,336		$	26,336		$	24,400		$	24,400		$	25,400
Allowance for credit losses(a)	$	278,937		$	306,501		$	278,937		$	283,394		$	290,280		$	300,951		$	306,501
Provision for credit losses(b)	$	4,000		$	21,000		4,000			—			—			5,000			12,000
Net loan (charge offs) recoveries
Commercial and industrial	$	(13,205	)	$	(15,414	)	$	(6,606	)	$	(6,599	)	$	(8,212	)	$	(9,442	)	$	(11,046	)
Commercial real estate — owner occupied	(755		)	62			270			(1,025		)	(246		)	13			43
Commercial and business lending	(13,960		)	(15,352		)	(6,336		)	(7,624		)	(8,458		)	(9,429		)	(11,003		)
Commercial real estate — investor	(1,181		)	(640		)	(1,189		)	8			(164		)	55			(126		)
Real estate construction	237			(15		)	48			189			(365		)	(150		)	(26		)
Commercial real estate lending	(944		)	(655		)	(1,141		)	197			(529		)	(95		)	(152		)
Total commercial	(14,904		)	(16,007		)	(7,477		)	(7,427		)	(8,987		)	(9,524		)	(11,155		)
Residential mortgage	(266		)	(692		)	(135		)	(131		)	(966		)	(26		)	(564		)
Home equity	(537		)	227			140			(677		)	330			(87		)	54
Other consumer	(2,072		)	(1,762		)	(984		)	(1,088		)	(1,048		)	(913		)	(906		)
Total consumer	(2,875		)	(2,227		)	(979		)	(1,896		)	(1,684		)	(1,026		)	(1,416		)
Total net charge offs	$	(17,779	)	$	(18,234	)	$	(8,456	)	$	(9,323	)	$	(10,671	)	$	(10,550	)	$	(12,571	)
Ratios
Allowance for loan losses to total loans	1.10		%	1.35		%	1.10		%	1.13		%	1.28		%	1.32		%	1.35		%
Allowance for loan losses to net charge offs (annualized)	7.0x			7.6x			7.4x			6.8x			6.3x			6.6x			5.6x

(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 13 Annualized net (charge offs) recoveries^(a) 

	YTD
(In basis points)	2018		2017		June 30, 2018		March 31, 2018		December 31, 2017		September 30, 2017		June 30, 2017
Net loan (charge offs) recoveries
Commercial and industrial	(40	)	(49	)	(39	)	(41	)	(51	)	(58	)	(69	)
Commercial real estate — owner occupied	(19	)	1		12		(48	)	(12	)	1		2
Commercial and business lending	(38	)	(43	)	(33	)	(42	)	(47	)	(51	)	(60	)
Commercial real estate — investor	(6	)	(4	)	(12	)	N/M		(2	)	1		(2	)
Real estate construction	3		N/M		1		5		(10	)	(4	)	(1	)
Commercial real estate lending	(3	)	(3	)	(8	)	1		(4	)	(1	)	(1	)
Total commercial	(23	)	(26	)	(22	)	(24	)	(30	)	(31	)	(36	)
Residential mortgage	(1	)	(2	)	(1	)	(1	)	(5	)	N/M		(3	)
Home equity	(11	)	5		6		(28	)	15		(4	)	2
Other consumer	(110	)	(94	)	(105	)	(115	)	(109	)	(97	)	(98	)
Total consumer	(6	)	(6	)	(4	)	(8	)	(8	)	(5	)	(7	)
Total net charge offs	(16	)	(18	)	(15	)	(17	)	(20	)	(20	)	(25	)

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

N/M = Not Meaningful

At June 30, 2018, the allowance for credit losses was $279 million, compared to $290 million at December 31, 2017 and $307 million at June 30, 2017. At June 30, 2018, the allowance for loan losses to total loans was 1.10% and covered 123.55% of nonaccrual loans, compared to 1.28% and 127.49%, respectively, at December 31, 2017 and 1.35% and 121.22%, respectively, at June 30, 2017. Management believes the level of allowance for loan losses to be appropriate at June 30, 2018.

Notable Contributions to the Change in Allowance for Credit Losses

• Total loans increased $2.2 billion (11%) for the first six months of 2018, including a $1.5 billion (13%) increase in total commercial loans primarily attributable to the Bank Mutual acquisition. Compared to June 30, 2017, total loans increased $2.2 billion (11%), including a $1.1 billion (15%) increase in total residential mortgage loans, a $502 million (10%) increase in commercial real estate lending, and a $582 million (8%) increase 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 decrease $4 million (2%) for the first six months of 2018, and decreased $27 million from June 30, 2017, primarily due to migration in the oil and gas related credits. 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 increased $65 million from December 31, 2017 primarily due to the downward migration of general commercial related credits and the addition of Bank Mutual loans. However, potential problem loans decreased $21 million from June 30, 2017, primarily due to improvements in general commercial related credits and migration in oil and gas related credits, respectively. See Table 10, for additional information on the changes in potential problem loans.

• Net charge offs decreased $2 million from December 31, 2017 and decreased $4 million from June 30, 2017. See Table 12 and Table 13 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 $17 million at June 30, 2018, compared to $27 million at December 31, 2017 and $33 million at June 30, 2017. See also Oil and gas lending within the Credit Risk section for additional disclosure.

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Deposits and Customer Funding

Table 14 Period End Deposit and Customer Funding Composition

($ in Thousands)	June 30, 2018				March 31, 2018				December 31, 2017				September 30, 2017				June 30, 2017
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
Noninterest-bearing demand	$	5,341,361	22	%	$	5,458,473	23	%	$	5,478,416	24	%	$	5,177,734	23	%	$	5,038,162	23	%
Savings	1,887,777		8	%	1,883,638		8	%	1,524,992		7	%	1,544,037		7	%	1,552,820		7	%
Interest-bearing demand	4,650,407		20	%	4,719,566		20	%	4,603,157		20	%	4,990,891		22	%	3,858,739		18	%
Money market	9,208,993		39	%	9,086,553		38	%	8,830,328		39	%	8,299,512		37	%	9,228,129		43	%
Brokered CDs	228,029		1	%	44,503		—	%	18,609		—	%	3,554		—	%	131,184		1	%
Other time	2,499,747		10	%	2,632,869		11	%	2,330,460		10	%	2,317,723		11	%	1,809,146		8	%
Total deposits	$	23,816,314	100	%	$	23,825,602	100	%	$	22,785,962	100	%	$	22,333,451	100	%	$	21,618,180	100	%
Customer funding(a)	235,804				297,289				250,332				324,042				360,131
Total deposits and customer funding	$	24,052,118			$	24,122,891			$	23,036,294			$	22,657,493			$	21,978,311
Network transaction deposits(b)	$	2,094,670			$	2,244,739			$	2,520,968			$	2,622,787			$	3,220,956
Net deposits and customer funding (total deposits and customer funding, excluding Brokered CDs and network transaction deposits)	$	21,729,419			$	21,833,649			$	20,496,717			$	20,031,152			$	18,626,171
Time deposits of more than $250,000	$	804,210			$	906,727			$	1,056,172			$	1,009,097			$	477,043

(a) Securities sold under agreement to repurchase and commercial paper.

(b) Included above in interest-bearing demand and money market.

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

• Total deposits increased $1.0 billion (5%) from December 31, 2017, primarily due to the acquisition of Bank Mutual partially offset by seasonal deposit outflows, and increased $2.2 billion (10%) from June 30, 2017.

• Non-maturity deposit accounts, comprised of savings, money market, and demand (both interest and noninterest-bearing) accounts accounted for 89% of the Corporation's total deposits at June 30, 2018.

• Included in the above amounts were $2.1 billion of network deposits, primarily sourced from other financial institutions and intermediaries. These represented 9% of the Corporation's total deposits at June 30, 2018. Network transaction deposits have declined approximately $1.1 billion from June 30, 2017, and have primarily been replaced by FHLB advances.

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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, 2018, 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 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, 2018, the Bank had $1.2 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, 2018, the Bank had $2.1 billion available for discount window borrowings.

• The Parent Company has a $200 million commercial paper program, of which, $53 million was outstanding as of June 30, 2018.

• Dividends and service fees from subsidiaries, as well as the proceeds from issuance of capital, are 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 Associated Bank at June 30, 2018 are displayed below.

Table 15 Credit Ratings

	Moody’s	S&P(a)
Associated Bank short-term deposits	P-1	-
Associated Bank long-term	A1	BBB+
Corporation short-term	P-2	-
Corporation long-term	Baa1	BBB
Outlook	Stable	Stable

(a) Standard and Poor's.

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For the six months ended June 30, 2018, net cash provided by operating activities and financing activities were $117 million and $156 million, respectively, while investing activities used net cash of $517 million, for a net decrease in cash and cash equivalents of $245 million since year-end 2017. At June 30, 2018, assets of $33.7 billion increased $3.2 billion from year-end 2017. On the funding side, deposits of $23.8 billion increased $1.0 billion from year-end 2017.

For the six months ended June 30, 2017, net cash provided by operating activities and financing activities were $319 million and $511 million, respectively, while investing activities used net cash of $907 million, for a net decrease in cash and cash equivalents of $76 million since year-end 2016. At June 30, 2017, assets of $29.8 billion increased $630 million from year-end 2016. On the funding side, deposits of $21.6 billion decreased by $270 million from year-end 2016.

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 the Corporation's risk appetite for interest rate risk over both short-term and long-term horizons. No limit breaches occurred during the first six months of 2018.

The major sources of the Corporation's 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. The Corporation’s interest rate risk profile is such that a higher or steeper yield curve adds to income while a flatter yield curve is relatively neutral, and a lower or inverted yield curve generally has a negative impact on earnings. Based on current rate expectations for a flattening yield curve, the Corporation's earnings at risk profile is slightly asset sensitive at June 30, 2018. While the modeled outcome of instantaneous and sustained parallel rate shocks of 100 bps or more indicate increased asset sensitivity, which would provide increased earnings, we see a low probability of a sustained parallel shift occurring in the near term.

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 2017 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 16 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, 2018		Static Forecast June 30, 2018		Dynamic Forecast December 31, 2017		Static Forecast December 31, 2017
Instantaneous Rate Change
100 bp increase in interest rates	4.5	%	3.4	%	2.5	%	2.7	%
200 bp increase in interest rates	8.9	%	6.7	%	4.6	%	4.9	%

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At June 30, 2018, the MVE profile indicates a decline in net balance sheet value due to instantaneous upward changes in rates.

Table 17 Market Value of Equity Sensitivity

	June 30, 2018		December 31, 2017
Instantaneous Rate Change
100 bp increase in interest rates	(2.6	)%	(3.1	)%
200 bp increase in interest rates	(5.5	)%	(6.7	)%

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, 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 18 Contractual Obligations and Other Commitments

June 30, 2018	One Year or Less		One to Three Years		Three to Five Years		Over Five Years		Total
	($ in Thousands)
Time deposits	$	1,950,673	$	646,062	$	128,296	$	2,745	$	2,727,776
Short-term funding	256,525		—		—		—		256,525
FHLB advances	1,882,613		352,646		208,876		2,353,722		4,797,857
Long-term funding	—		249,490		—		248,129		497,619
Operating leases	9,815		18,572		13,881		22,447		64,715
Commitments to extend credit	4,450,407		2,706,972		1,565,756		164,536		8,887,671
Total	$	8,550,033	$	3,973,742	$	1,916,809	$	2,791,579	$	17,232,163

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, 2018, 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 funding, FHLB advances, and long-term funding.

Table 18 summarizes significant contractual obligations and other commitments at June 30, 2018, 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, 2018, the capital ratios of the Corporation and its banking subsidiaries were in excess of regulatory minimum requirements. The Corporation’s capital ratios are summarized in Table 19.

Table 19 Capital Ratios

	2Q18			1Q18			4Q17			3Q17			2Q17
	($ in Thousands)
Risk-based Capital(a)
Common equity Tier 1	$	2,528,002		$	2,473,677		$	2,171,508		$	2,144,325		$	2,130,238
Tier 1 capital	2,686,658			2,632,912			2,331,245			2,304,037			2,289,831
Total capital	3,213,726			3,164,362			2,848,851			2,823,097			2,808,049
Total risk-weighted assets	24,059,029			23,535,483			21,544,463			21,657,286			21,590,134
Common equity Tier 1 capital ratio	10.51		%	10.51		%	10.08		%	9.90		%	9.87		%
Tier 1 capital ratio	11.17		%	11.19		%	10.82		%	10.64		%	10.61		%
Total capital ratio	13.36		%	13.45		%	13.22		%	13.04		%	13.01		%
Tier 1 leverage ratio	8.32		%	8.48		%	8.02		%	7.93		%	8.09		%
Selected Equity and Performance Ratios
Total stockholders’ equity / assets	11.20		%	11.13		%	10.62		%	10.66		%	10.72		%
Dividend payout ratio(b)	29.41		%	36.59		%	45.16		%	29.27		%	33.33		%

(a) 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 the Corporation's capital with the capital of other financial services companies. See Table 20 for a reconciliation of common equity Tier 1 and average common equity Tier 1.

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

As part of the regulatory relief provided by the Economic Growth Act, the asset threshold requiring insured depository institutions to conduct and report to their primary federal bank regulators annual company-run stress tests was raised from $10 billion to $250 billion in total consolidated assets and makes the requirement “periodic” rather than annual. The amendments also provide the Federal Reserve Board with discretion to subject bank holding companies with more than $100 billion in total assets to enhanced supervision. Notwithstanding these amendments, the federal banking agencies indicated through interagency guidance that the capital planning and risk management practices of institutions with total assets less than $100 billion would continue to be reviewed through the regular supervisory process. In addition, the federal banking agencies are now prohibited from requiring the Bank to assign a heightened risk weight to certain HVCRE ADC loans as previously required under the Basel III Capital Rules. Although the Corporation will continue to monitor its capital consistent with the safety and soundness expectations of the federal regulators, the Corporation will no longer conduct company-run stress testing as a result of the legislative and regulatory amendments.

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Non-GAAP Measures

Table 20 Non-GAAP Measures

	YTD						Quarter Ended
	June 30, 2018			June 30, 2017			June 30, 2018			March 31, 2018			December 31, 2017			September 30, 2017			June 30, 2017
	($ in Thousands)
Selected Equity and Performance Ratios(a)(b)
Tangible common equity / tangible assets							7.29		%	7.22		%	7.07		%	7.08		%	7.11		%
Return on average equity	8.81		%	7.33		%	9.61		%	7.96		%	6.17		%	8.10		%	7.35		%
Return on average tangible common equity	13.51		%	11.06		%	14.98		%	11.99		%	9.16		%	12.20		%	11.06		%
Return on average Common equity Tier 1	12.73		%	10.62		%	14.00		%	11.39		%	8.77		%	11.73		%	10.63		%
Return on average assets	0.98		%	0.79		%	1.07		%	0.88		%	0.66		%	0.86		%	0.80		%
Average stockholders' equity / average assets	11.06		%	10.85		%	11.13		%	11.00		%	10.73		%	10.63		%	10.84		%
Tangible Common Equity and Common Equity Tier 1 Reconciliation(a)(b)
Common equity							$	3,610,843		$	3,552,846		$	3,077,514		$	3,043,672		$	3,031,573
Goodwill and other intangible assets, net							(1,247,011		)	(1,232,870		)	(991,819		)	(986,086		)	(986,536		)
Tangible common equity							2,363,832			2,319,977			2,085,695			2,057,586			2,045,037
Less: Accumulated other comprehensive income / loss							119,888			107,673			62,758			54,288			53,470
Less: Deferred tax assets/deferred tax liabilities, net							44,282			46,027			23,055			32,451			31,731
Common equity Tier 1							$	2,528,002		$	2,473,677		$	2,171,508		$	2,144,325		$	2,130,238
Tangible Assets Reconciliation(a)
Total assets							$	33,652,647		$	33,366,505		$	30,483,594		$	30,064,547		$	29,769,025
Goodwill and other intangible assets, net							(1,247,011		)	(1,232,870		)	(991,819		)	(986,086		)	(986,536		)
Tangible assets							$	32,405,635		$	32,133,636		$	29,491,775		$	29,078,461		$	28,782,489
Average Tangible Common Equity and Average Common Equity Tier 1 Reconciliation(a)(b)
Common equity	$	3,469,861		$	2,984,451		$	3,561,319		$	3,377,388		$	3,056,077		$	3,024,918		$	3,005,209
Goodwill and other intangible assets, net	(1,171,917		)	(986,980		)	(1,235,623		)	(1,107,503		)	(991,955		)	(986,342		)	(986,826		)
Tangible common equity	2,297,945			1,997,471			2,325,696			2,269,885			2,064,121			2,038,576			2,018,383
Less: Accumulated other comprehensive income / loss	103,379			52,179			117,497			89,105			61,937			49,164			50,148
Less: Deferred tax assets/deferred tax liabilities, net	38,165			31,242			45,308			30,943			29,386			31,935			31,294
Average common equity Tier 1	$	2,439,489		$	2,080,892		$	2,488,501		$	2,389,933		$	2,155,444		$	2,119,675		$	2,099,825
Efficiency Ratio Reconciliation(c)
Federal Reserve efficiency ratio	68.18		%	66.54		%	65.77		%	70.76		%	66.93		%	63.92		%	66.69		%
Fully tax-equivalent adjustment	(0.66		)%	(1.30		)%	(0.65		)%	(0.66		)%	(1.30		)%	(1.21		)%	(1.30		)%
Other intangible amortization	(0.59		)%	(0.19		)%	(0.68		)%	(0.51		)%	(0.18		)%	(0.16		)%	(0.18		)%
Fully tax-equivalent efficiency ratio	66.94		%	65.05		%	64.45		%	69.60		%	65.45		%	62.55		%	65.21		%

(a) 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.

(b) 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 the Corporation's capital with the capital of other financial services companies.

(c) 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 2018.

During the second quarter of 2018, approximately 3.6 million TARP warrants ("warrants") were exercised at an exercise price of $19.77. The warrants were converted to approximately 1.0 million shares of common stock. Approximately 358,000 warrants remain outstanding. Any unexercised warrants will expire on November 21, 2018.

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Sequential Quarter Results

The Corporation reported net income of $89 million for the second quarter of 2018, compared to net income of $69 million for the first quarter of 2018. Net income available to common equity was $87 million for the second quarter of 2018 or $0.51 for basic and $0.50 diluted earnings per common share. Comparatively, net income available to common equity for the first quarter of 2018 was $67 million, or net income of $0.41 for basic and $0.40 diluted earnings per common share, respectively (see Table 1).

Fully tax-equivalent net interest income for the second quarter of 2018 was $230 million, $17 million higher from the first quarter of 2018. The net interest margin in the second quarter of 2018 was up 10 bp to 3.02%. Average earning assets increased $1.1 billion to $30.4 billion in the second quarter of 2018, with average loans up $927 million, while average investments and other short-term investments were up $204 million. On the funding side, average interest-bearing deposits were down $52 million, while noninterest-bearing demand deposits were up $47 million. Average short and long-term funding increased $1.0 billion (see Table 2).

The provision for credit losses was $4 million for the second quarter of 2018 compared to zero for the first quarter of 2018 (see Table 12). See discussion under sections: Provision for Credit Losses, Nonperforming Assets, and Allowance for Credit Losses.

Noninterest income for the second quarter of 2018 increased $2 million (3%) to $93 million versus the first quarter of 2018. Fee-based revenue increased $2 million (3%) from the first quarter of 2018, primarily due to higher insurance commissions and fees. Bank and corporate owned life insurance was up $1 million (25%) from the first quarter of 2018. Asset gains increased $3 million from the first quarter of 2018, but the gains were partially offset by a $2 million loss on sale of investment securities.

Noninterest expense decreased $2 million (1%) to $211 million. Personnel expense was $124 million for the second quarter of 2018, up $6 million (5%) from the first quarter of 2018 primarily driven by an increase in performance-based payouts under the management incentive plan. Technology expense increased $2 million (10%) from the first quarter of 2018. Bank Mutual acquisition related costs were $7 million for the second quarter of 2018, down $13 million from the first quarter of 2018.

For the second quarter of 2018, the Corporation recognized income tax expense of $15 million, compared to income tax expense of $18 million for the first quarter of 2018. The effective tax rate was 14.19% and 20.43% for the second quarter of 2018 and the first quarter of 2018, respectively. See Income Taxes section for a detailed discussion on income taxes.

Comparable Quarter Results

The Corporation reported net income of $89 million for the second quarter of 2018, compared to $58 million for the second quarter of 2017. Net income available to common equity was $87 million for the second quarter of 2018, or $0.51 for basic earnings per common share and $0.50 for diluted earnings per common share. Comparatively, net income available to common equity for the second quarter of 2017 was $56 million, or $0.36 for both basic and diluted earnings per common share (see Table 1).

Fully tax-equivalent net interest income for the second quarter of 2018 was $230 million, $40 million higher than the second quarter of 2017. The net interest margin between the comparable quarters was up 19 bp, to 3.02%, in the second quarter of 2018. Average earning assets increased $3.7 billion to $30.4 billion in the second quarter of 2018, with average loans increaseing $2.5 billion (predominantly due to the Bank Mutual acquisition). On the funding side, average interest-bearing deposits increased $1.9 billion, while noninterest-bearing demand deposits increased $240 million from the second quarter of 2017. Average short and long-term funding increased $1.4 billion (see Table 2).

The provision for credit losses was $4 million for the second quarter of 2018, down $8 million from the second quarter of 2017. See discussion under sections: Provision for Credit Losses, Nonperforming Assets, and Allowance for Credit Losses.

Noninterest income for the second quarter of 2018 of $93 million was up $10 million (13%) compared to second quarter of 2017. Brokerage commissions and fees was up $3 million (59%), primarily driven by increased investment advisory fees compared to the second quarter of 2017 driven by the Whitnell acquisition. Insurance and commission fees for the second quarter of 2018 was up $3 million (15%) from the second quarter of 2017 driven by the Diversified and Anderson acquisitions.

On a comparable quarter basis, noninterest expense increased $35 million (20%) to $211 million for the second quarter of 2018. Bank Mutual acquisition related costs were $7 million for the second quarter of 2018. Personnel expense was $124 million for the second quarter of 2018, up $17 million (16%) from the second quarter of 2017, primarily driven by the additional cost of Bank Mutual staff and an increase in the management incentive plan. Technology expense increased $4 million (26%) to $19 million in the second quarter of 2018, driven by investments in technology solutions that meet evolving customer needs and improve operational efficiency as well as the additional cost of Bank Mutual operations. Occupancy expense increased $2 million (17%) for the second quarter of 2018, primarily due to the additional expense of acquired Bank Mutual facilities.

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The Corporation recognized income tax expense of $15 million for the second quarter of 2018, compared to income tax expense of $20 million for second quarter of 2017. The effective tax rate was 14.19% and 25.58% for the second quarter of 2018 and 2017, respectively. See Income Taxes section for a detailed discussion on income taxes.

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 $103 million for the first six months of 2018, up $33 million, compared to $70 million for the first six months of 2017. Segment revenue increased $26 million to $230 million for the first six months of 2018, compared to $204 million for the first six months of 2017, primarily due to growth in average loan balances and increases in the Federal Reserve interest rate. The credit provision decreased $1 million to $22 million during the first six months of 2018. Average loan balances were $11.7 billion for the first six months of 2018, up $920 million from the first six months of 2017. Average deposit balances were $7.8 billion for the first six months of 2018, up $1.4 billion from the first six months of 2017. Average allocated capital increased $84 million to $1.2 billion for the first six months of 2018, 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 $73 million for the first six months of 2018, up $36 million from the first six months of 2017. Segment revenue increased $59 million to $368 million for the first six months of 2018, primarily due to growth in average loan balances, increases in the Federal Reserve interest rate, higher brokerage commissions and fees, and increased mortgage banking income. Total expense increased $24 million to $266 million for the first six months of 2018, primarily due to the additional cost of Bank Mutual staff. Average loan balances were $10.3 billion for the first six months of 2018, up $947 million from the first six months of 2017. Average deposits were $13.4 billion for the first six months of 2018, up $2.0 billion from the first six months of 2017. Average allocated capital increased $65 million to $648 million for the first six months of 2018.

The Risk Management and Shared Services segment had a net loss of $17 million for the first six months of 2018, down $24 million compared to the first six months of 2017. Net interest income increased $9 million, primarily due to increases in the Federal Reserve interest rate, as well as an adjustment of FTP rate assumptions that increased the interest income allocated to the lines of business with an offsetting decrease in the interest income allocated to the Risk Management and Shared Services segment. The credit provision improved $15 million. Noninterest expense increased $46 million from the first six months of 2017 primarily driven by $28 million of acquisition related costs and certain unallocated expenses related to Bank Mutual shared services and operations prior to system conversion in late June 2018. Average earning asset balances were $7.8 billion for the first six months of 2018, up $1.4 billion from the first six months of 2017. Average deposits were $2.4 billion for the first six months of 2018, down $1.2 billion from the first six months of 2017 primarily driven by a decrease in network transaction deposits. Average allocated capital increased to $587 million for the first six months of 2018.

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Comparable Quarter Segment Review

The Corporate and Commercial Specialty segment had net income of $55 million for the second quarter of 2018, up $20 million from the comparable quarter in 2017. Segment revenue increased $19 million compared to second quarter of 2017, primarily due to growth in average loan balances and increases in the Federal Reserve interest rate. Average loan balances were $12.1 billion for the second quarter of 2018, up $1.2 billion from an average balance of $10.8 billion for second quarter of 2017. Average deposit balances were $7.6 billion for the second quarter of 2018, up $1.2 billion from the comparable quarter of 2017. Average allocated capital increased $111 million to $1.2 billion for second quarter of 2018.

The Community, Consumer, and Business segment had net income of $37 million for the second quarter of 2018, up $21 million compared to second quarter of 2017. Segment revenue increased $35 million to $191 million for the second quarter of 2018, primarily due to a $24 million increase in net interest income and $10 million increase in noninterest income. The growth in net interest income was primarily due to growth in average loan balances and increases in the Federal Reserve interest rate while the growth in noninterest income was primarily driven by the acquisitions of Whitnell & Co., Diversified, and Anderson since June 30, 2017 which resulted in increased insurance and brokerage commissions. Total noninterest expense for the second quarter of 2018 was $139 million, up $13 million from the comparable quarter of 2017, primarily due to the additional cost of Bank Mutual staff. Average loan balances were $10.4 billion for the second quarter of 2018, up $891 million from the comparable quarter of 2017. Average deposits were $13.7 billion for the second quarter of 2018, up $2.2 billion from average deposits of $11.6 billion for the comparable quarter of 2017. Average allocated capital increased $74 million compared to the second quarter of 2017.

The Risk Management and Shared Services segment had a net loss of $3 million for the first quarter of 2018. Segment revenue was $7 million in the second quarter of 2018, a decrease of $1 million from the comparable quarter of 2017. The credit provision improved $7 million. Total noninterest expense for the second quarter of 2018 was $31 million, up $19 million from the comparable quarter of 2017, primarily driven by $7 million of acquisition related costs and certain unallocated expenses related to Bank Mutual shared services and operations prior to system conversion in late June 2018. Average earning asset balances were $7.9 billion for the first six months of 2018, up $1.6 billion from the first six months of 2017. Average deposits were $2.3 billion for second quarter of 2018, down $1.2 billion versus the comparable quarter of 2017 primarily driven by a decrease in network transaction deposits. Average allocated capital increased $203 million to $588 million for second quarter of 2018.

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 2017 Annual Report on Form 10-K. There have been no changes in the Corporation's application of critical accounting policies since December 31, 2017.

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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 anticipated adoption	Effect on financial statements
ASU 2018-07 Compensation - Stock Compensation (Topic 718) Improvements to Nonemployee Share-Based Payment Accounting	The FASB issued an amendment as part of its simplification initiative. As part of this amendment, several aspects of the accounting for nonemployee share-based payment transactions for acquiring goods and services from nonemployees are changing. The amendment expands the scope of Topic 718 to apply to nonemployee awards with the exception for specific guidance on inputs to an option pricing model and the attribution of cost.	1st Quarter 2019	The Corporation is currently evaluating the impact on its results of operations, financial position and liquidity.
ASU 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The FASB issued an amendment to simplify the subsequent quantitative measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Entities should apply the amendment prospectively. Early adoption is permitted, including in an interim period, for impairment tests performed after January 1, 2017. The Corporation has not had to perform a step one quantitative analysis since 2012, which concluded no impairment was necessary.	2nd Quarter 2020, consistent with the Corporation's annual impairment test in May of each year.	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.
ASU 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. A cross-functional team has been established to assess and implement the standard.
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. ASU 2018-01 amendment permits an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842. ASU 2018-10 was issued as improvements and clarifications of ASU 2016-02 were identified. This update provides clarification on narrow aspects of the previously issued updates.	1st Quarter 2019	The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity. A cross-functional team has been established to assess and implement the standard.

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Recent Developments

The Corporation received a favorable Minnesota tax court ruling during the second quarter of 2017, at which time, a percentage of the reserve which had been accrued for the state tax issue being litigated was reversed. On July 5, 2018, the Minnesota tax court ruling was reversed by the Minnesota Supreme Court and as a result, the Corporation expects to record additional income tax expense of $6 million in the third quarter of 2018. As discussed in the Performance Summary at the beginning of Part I, Item 2., Management's Discussion and Analysis of Financial Condition and Results of Operations, after taking this impact into consideration, the Corporation expects the effective tax rate to be approximately 22% for the remainder of the year, and approximately 20% for the full year 2018.

On July 24, 2018, the Corporation's Board of Directors declared a regular quarterly cash dividend of $0.15 per common share, payable on September 17, 2018 to shareholders of record at the close of business on September 4, 2018. 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 17, 2018 to shareholders of record at the close of business on September 4, 2018. 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 17, 2018 to shareholders of record at the close of business on September 4, 2018.

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 the Corporation's 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, 2018 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, 2018.

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 1A. Risk Factors

The recently enacted Economic Growth, Regulatory Relief, and Consumer Protection Act did not eliminate many of the aspects of the Dodd Frank Act that have increased our compliance costs, and remains subject to further rulemaking.

The Economic Growth Act represents modest reform to the regulation of the financial services industry primarily through certain amendments of the Dodd-Frank Act. However, many provisions of the Dodd-Frank Act that have increased our compliance costs, such as the Volcker Rule, the Durbin amendment restricting interchange fees, and the additional supervisory authority of the CFPB, remain in place.

Certain of the provisions amended by the Economic Growth Act took effect immediately, while others require that the agencies jointly amend their rulemakings. It is not possible to predict when any final rules would ultimately be issued through any such rulemakings, and what the specific content of such rules will be. Although we expect to benefit from many aspects of this legislative reform, the legislation and any implementing rules that are ultimately issued could have adverse implications on the financial industry, the competitive environment, and our ability to conduct business. In addition, the federal banking agencies indicated through interagency guidance that the capital planning and risk management practices of institutions with total assets less than $100 billion would continue to be reviewed through the regular supervisory process, which may offset the impact of the Economic Growth Acts changes regarding stress testing and risk management.

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

During the second quarter of 2018, the Corporation repurchased $6.6 million, or approximately 249,000 shares, of common stock. The repurchase details are presented in the table below.

Common Stock Purchases

	Total Number  of Shares Purchased(a)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs(b)
Period
April 1, 2018 - April 30, 2018	50,000	$	24.02	$	50,000	—
May 1, 2018 - May 31, 2018	198,700	27.14		198,700		—
June 1, 2018 - June 30, 2018	—	—		—		—
Total	248,700	$	26.52	$	248,700	4,314,634

(a) During the second quarter of 2018, the Corporation repurchased 17,613 common shares for minimum tax withholding settlements on equity compensation. These purchases do not count against the maximum number of shares that may yet be purchased under the Board of Directors’ authorization.

(b) 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 $18 million remained available to repurchase as of June 30, 2018. On April 24, 2018, the Board of Directors authorized the repurchase of up to $100 million of the Corporation's common stock, of which all remains available for repurchase. Using the closing stock price on June 30, 2018 of $27.30, a total of approximately 4.3 million shares of common stock remained available to be repurchased under these previously approved Board authorizations as of June 30, 2018.

During the second quarter of 2018, the Corporation repurchased approximately $459,000, or 18,540 shares of preferred stock. The repurchase details are presented in the table below.

Series D Preferred Stock Depository Share Purchases

83

	Total Number  of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs(a)
Period
April 1, 2018 - April 30, 2018	—	$	—	$	—	—
May 1, 2018 - May 31, 2018	18,540	24.75		18,540		—
June 1, 2018 - June 30, 2018	—	—		—		—
Total	18,540	$	24.75	$	18,540	578,541

(a) On July 25, 2017, the Board of Directors authorized the repurchase of up to $15 million of the depository shares of the Series D Preferred Stock, of which approximately $14.5 million remained available to repurchase as of June 30, 2018. Using the closing stock price on June 30, 2018 of $24.99, a total of approximately 579,000 shares of Series D Preferred stock remained available to be repurchased under the previously approved Board authorizations as of June 30, 2018.

On August 28, 2015, the Board of Directors authorized the repurchase of up to $10 million of depositary shares of the Series C Preferred Stock, of which all of such depository shares remained available to repurchase as of June 30, 2018.

The repurchase of depository shares is 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 Associated Banc-Corp 2017 Incentive Compensation Plan Restricted Stock Agreement.

Exhibit (11), Statement regarding computation of per share earnings. The information required by this item is set forth in Part I, 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.

84

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 26, 2018	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer
Date: July 26, 2018	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer
Date: July 26, 2018	/s/ Tammy C. Stadler
	Tammy C. Stadler
	Principal Accounting Officer

85

EX-10.1

Exhibit 10.1 Associated Banc-Corp 2017 Incentive Compensation Plan Cover Page to Restricted Stock Agreement (The Restricted Stock Agreement has been delivered simultaneously herewith) Grantee Name: PARTICIPANT NAME Grant Date: GRANT DATE Grant Price: Grant Acceptance Process: Step 1: Please read the below Restricted Stock Agreement in its entirety, and print for your records. Step 2: After thoroughly reviewing the Restricted Stock Agreement, review your individual award information. Step 3: Electronically accept your grant via the Online Grant Agreement portal of Fidelity’s website. Share Information Subject to this Award: Restricted Stock Award Pursuant and subject to the Associated Banc-Corp 2017 Incentive Compensation Plan (the “Plan”) and the Restricted Stock Agreement delivered to Grantee simultaneously herewith, the Committee has awarded the Grantee named above shares of restricted Common Stock of Associated Banc-Corp (“Restricted Shares”) as follows: Restricted Stock Shares Awarded: NUMBER OF AWARDS GRANTED IN WITNESS WHEREOF, as of the Grant Date the Company hereby grants to the Grantee the Restricted Shares pursuant to the terms and conditions of the Restricted Stock Agreement delivered simultaneously herewith and the terms and conditions of the Plan. ASSOCIATED BANC-CORP Philip B. Flynn, President & CEO Please electronically accept your grant via the Online Grant Agreement portal of Fidelity’s website. Failure to do so by March 31, 2018 may result in forfeiture of the Restricted Shares. US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 ASSOCIATED BANC-CORP 2017 INCENTIVE COMPENSATION PLAN RESTRICTED STOCK AGREEMENT In accordance with and subject to the terms of the Associated Banc-Corp 2017 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 Agreement (the “Cover Page”) an award of Restricted Shares of Associated Banc-Corp (the “Company”) (the Cover Page and this Restricted Stock Agreement hereinafter referred to as this “Agreement”). To evidence such award and to set forth its terms, 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 Shares. 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 shares set forth on the Cover Page (the “Restricted Shares”), effective as of the grant date set forth on the Cover Page (the “Grant Date”), and the Grantee hereby accepts the grant of the Restricted Shares on a restricted basis, as set forth herein. 2. Limitations on Transferability. At any time prior to vesting in accordance with Paragraph 3, 4 or 5 below, the Restricted Shares, or any interest therein, cannot be directly or indirectly transferred, sold, assigned, encumbered or otherwise disposed. 3. Dates of Vesting. Subject to the provisions of Paragraphs 4 and 5 below, the Restricted Shares shall cease to be restricted and shall become non-forfeitable (thereafter being referred to as “Vested Shares”) in accordance with the following schedule: Vesting Date Percentage of Restricted Shares To Vest February 8, 2019 25% February 8, 2020 25% February 8, 2021 25% February 8, 2022 25% Notwithstanding the foregoing, and subject to Paragraphs 4 and 5 below, in the event that the Grantee incurs a Termination of Service, any Restricted Shares 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 the vesting dates set forth herein but the Grantee has not incurred a Termination of Service, the Company shall cause a portion of the Restricted Shares to become Vested Shares on the date such age and years of service requirements are met, such portion limited to the minimum amount necessary to satisfy US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 the tax withholding obligations set forth in Paragraph 25 or otherwise required by any taxing authority. 4. Termination of Service. Subject to Paragraph 5 below, the provisions of this Paragraph 4 shall apply in the event the Grantee incurs a Termination of Service at any time prior to all the Restricted Shares becoming Vested Shares pursuant to Paragraph 3 above: (a) If the Grantee incurs a Termination of Service because of his or her death or Disability, any Restricted Shares that had not become Vested Shares prior to the date of such Termination of Service shall become Vested Shares, and the Grantee shall immediately own the Vested Shares free of all restrictions otherwise imposed by this Agreement except for Vested Shares used to satisfy the tax withholding obligations set forth in Paragraph 25 below or otherwise required by any taxing authority. (b) If the Grantee incurs a Termination of Service due to Early Retirement or Normal Retirement any Restricted Shares that had not become Vested Shares prior to the date of such Termination of Service shall become Vested Shares, and the Grantee shall immediately own the Vested Shares free of all restrictions otherwise imposed by this Agreement. (c) If the Grantee incurs a Termination of Service for any reason other than as stated in Paragraphs 4(a) or 4(b) above, then any Restricted Shares that had not become Vested Shares prior to the date of such Termination of Service shall be immediately forfeited to the Company without consideration. 5. Change in Control. Notwithstanding Paragraph 4 above, if the Grantee incurs an involuntary Termination of Service by the Company (other than due to Cause) during the two year period immediately following a Change in Control, any Restricted Shares that had not become Vested Shares prior to the date of such Termination of Service shall become Vested Shares, and the Grantee shall immediately own the Vested Shares free of all restrictions otherwise imposed by this Agreement except for Vested Shares used to satisfy the tax withholding obligations set forth in Paragraph 25 below or otherwise required by any taxing authority. In addition, upon a Change in Control, the Grantee will have such rights with respect to the Restricted Shares as are provided for in the Plan. 6. Transfer of Restricted Shares. The Company, in its sole discretion, shall credit the Restricted Shares to the Grantee in a book entry on the records kept by the Company’s transfer agent. The Restricted Shares shall be subject to restrictions on transfer until, and to the extent, such Restricted Shares become Vested Shares pursuant to Paragraph 3, 4 or 5 above. To the extent any Restricted Shares fail to become Vested Shares pursuant to Paragraph 3, 4 or 5 above, the Company shall cancel such forfeited Restricted Shares pursuant to the terms of the Plan and this Agreement without consideration. The Company shall release the restrictions in the book entry records of its transfer agent once Restricted Shares become Vested Shares. 7. 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 US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 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 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 US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 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 business from any person or entity who is an Active Customer (as defined below) and to whom the Grantee has provided products or services 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; (ii) request or advise any of the Active Customers, to whom the Grantee provided products or services during his/her employment with the Company to withdraw, curtail or cancel any of their business relations with the Company. “Active Customer” shall mean any person or entity that, within the Reference Period, received any products or services supplied by or on behalf of the Company or one of its Subsidiaries. (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 reason, the Grantee will not, directly or indirectly, on behalf of him/herself or any other person, entity or enterprise: 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. “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 7, any Restricted Shares shall be immediately forfeited to the Company without consideration. 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 US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 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 7. If any court of competent jurisdiction shall deem any provision in this Paragraph 7 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 7 shall survive the termination of this Agreement, the forfeiture of any Restricted Shares, and the Grantee’s termination of employment for any reason, and the Grantee shall continue to be bound by the terms of this Paragraph 7 as if this Agreement was still in effect. 8. Liability of the 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. 9. Adjustment in Restricted Shares. This Award of Restricted Shares is subject to adjustment as provided under Section 4.2 of the Plan. 10. 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. 11. Shareholder Rights. The Grantee shall be entitled to receive any dividends that become payable on or after the Grant Date with respect to the Restricted Shares and Vested Shares; provided, however, that no dividends shall be payable (a) with respect to the Restricted Shares on account of record dates occurring prior to the Grant Date and (b) with respect to forfeited Restricted Shares on account of record dates occurring on or after the date of such forfeiture. The Grantee shall be entitled to vote the Restricted Shares on or after the Grant Date to the same extent as would have been applicable to the Grantee if the Restricted Shares had then been Vested Shares; provided, however, that the Grantee shall not be entitled to vote (a) the Restricted Shares on account of record dates occurring prior to the Grant Date and (b) with respect to forfeited Restricted Shares on account of record dates occurring on or after the date of such forfeiture. 12. 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 US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 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. 13. 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 Common Stock, Restricted Shares or Vested Shares, 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 the Shares. 14. 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 the grant of the Restricted Shares to the Grantee. 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. 15. 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 Restricted Shares or Vested Shares to be entered 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; (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 Restricted Shares (including any proceeds, gains, or other economic benefit actually or constructively received by the Grantee thereof upon the receipt or vesting thereof, or resale of the Shares received pursuant hereto upon or after the Restricted Shares become Vested Shares) 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. US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 16. 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. 17. 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. 18. 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. 19. Construction. Notwithstanding any other provision of this Agreement, this Agreement is made and the Restricted Shares 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. 20. 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. 21. 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. 22. 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. 23. Headings. The headings contained in this Agreement are for reference purposes only and shall not affect the meaning or interpretation of this Agreement. 24. 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. US_131388500v1_214273-00000 7/19/2018 8:55 AM

Exhibit 10.1 25. Tax Consequences. The Grantee acknowledges and agrees that the Grantee is responsible for all taxes and tax consequences with respect to the grant of the Restricted Shares or the lapse of restrictions otherwise imposed by this Agreement. 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 of the Restricted Shares or the lapse of restrictions otherwise imposed by this Agreement. If the Grantee files a Code Section 83(b) election with respect to the Restricted Shares, he or she will immediately notify the Company of such election. Notwithstanding any other provision of this Agreement, the Restricted Shares shall not be released to the Grantee 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 of the Restricted Shares or the lapse of restrictions otherwise imposed by this Agreement. 26. 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 Restricted Shares 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 Restricted Shares 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. 27. 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 Shares 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 7 of this Agreement. US_131388500v1_214273-00000 7/19/2018 8:55 AM

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 26, 2018	/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 26, 2018	/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, 2018 (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 26, 2018

/s/ Christopher J. Del Moral-Niles

Christopher J. Del Moral-Niles

Chief Financial Officer

July 26, 2018

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
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, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
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		172,093,888

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 396,761	$ 483,666
Interest-bearing deposits in other financial institutions	71,462	199,702
Federal funds sold and securities purchased under agreements to resell	3,150	32,650
Investment securities held to maturity, at amortized cost	2,602,247	2,282,853
Investment securities available for sale, at fair value	4,261,651	4,043,446
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	249,040	165,331
Residential loans held for sale	143,022	85,544
Loans	22,976,786	20,784,991
Allowance for loan losses	(252,601)	(265,880)
Loans, net	22,724,184	20,519,111
Bank and corporate owned life insurance	659,592	591,057
Tax credit and other investments	137,051	147,099
Trading assets	132,919	69,675
Premises and equipment, net	361,385	330,963
Goodwill	1,166,665	976,239
Mortgage servicing rights, net	66,980	58,384
Other intangible assets, net	80,346	15,580
Other assets	596,190	482,294
Total assets	33,652,647	30,483,594
Liabilities and Stockholders’ Equity
Noninterest-bearing demand deposits	5,341,361	5,478,416
Interest-bearing deposits	18,474,953	17,307,546
Total deposits	23,816,314	22,785,962
Federal funds purchased and securities sold under agreements to repurchase	203,733	324,815
Commercial paper	52,791	67,467
FHLB advances	4,797,857	3,184,168
Other long-term funding	497,619	497,282
Trading liabilities	131,612	67,660
Accrued expenses and other liabilities	382,476	318,797
Total liabilities	29,882,403	27,246,151
Stockholders’ Equity
Preferred equity	159,401	159,929
Common stock	1,751	1,618
Surplus	1,828,965	1,454,188
Retained earnings	1,920,579	1,819,230
Accumulated other comprehensive income (loss)	(119,888)	(62,758)
Treasury stock, at cost	(20,564)	(134,764)
Total common equity	3,610,843	3,077,514
Total stockholders’ equity	3,770,244	3,237,443
Total liabilities and stockholders’ equity	$ 33,652,647	$ 30,483,594
Preferred shares issued	164,570	165,000
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Common shares issued	175,133,157	161,751,975
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Treasury shares of common stock	1,606,672	8,908,448

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Income
Interest and fees on loans	$ 246,646	$ 184,246	$ 466,680	$ 357,895
Interest and dividends on investment securities:
Taxable	30,623	23,658	60,727	47,133
Tax-exempt	10,783	8,143	20,000	16,272
Other interest	3,153	1,553	5,330	3,089
Total interest income	291,205	217,600	552,737	424,389
Interest Expense
Interest on deposits	38,431	21,180	71,843	38,104
Interest on Federal funds purchased and securities sold under agreements to repurchase	538	824	1,060	1,339
Interest on other short-term funding	51	84	111	169
Interest on FHLB advances	21,279	7,149	34,402	11,596
Interest on long-term funding	4,544	4,544	9,088	9,088
Total interest expense	64,843	33,781	116,504	60,296
Net Interest Income	226,362	183,819	436,233	364,093
Provision for credit losses	4,000	12,000	4,000	21,000
Net interest income after provision for credit losses	222,362	171,819	432,233	343,093
Noninterest Income
Service charges on deposit account fees	72,825	65,014	145,553	129,896
Mortgage banking, net	6,258	5,027	12,628	9,606
Capital markets, net	4,783	4,042	10,089	7,925
Bank and corporate owned life insurance	3,978	3,899	7,165	6,514
Asset gains (losses), net	2,497	(466)	2,390	(700)
Investment securities gains (losses), net	(2,015)	356	(2,015)	356
Other	2,235	2,213	4,727	4,492
Total noninterest income	92,842	82,410	183,222	162,241
Noninterest Expense
Personnel	123,980	107,066	241,665	213,848
Occupancy	15,071	12,832	30,428	28,051
Technology	19,452	15,473	37,167	29,893
Equipment	5,953	5,234	11,509	10,719
Business development and advertising	7,067	7,152	13,760	12,987
Legal and professional	6,284	5,711	11,697	9,877
Card issuance and loan costs	3,173	2,974	6,477	5,594
Foreclosure / OREO expense, net	1,021	1,182	1,744	2,687
FDIC assessment	8,250	8,000	16,500	16,000
Other intangible amortization	2,168	496	3,693	1,009
Acquisition related costs(1)	7,107	0	27,712	0
Other	11,732	10,196	21,873	19,342
Total noninterest expense	211,258	176,316	424,223	350,007
Income before income taxes	103,947	77,913	191,232	155,327
Income tax expense	14,754	19,930	32,583	41,074
Net income	89,192	57,983	158,648	114,253
Preferred stock dividends	2,329	2,339	4,668	4,669
Net income available to common equity	$ 86,863	$ 55,644	$ 153,980	$ 109,584
Earnings per common share:
Basic	$ 0.51	$ 0.36	$ 0.92	$ 0.72
Diluted	$ 0.50	$ 0.36	$ 0.90	$ 0.71
Average common shares outstanding:
Basic	170,633	151,573	167,096	151,196
Diluted	173,409	154,302	169,920	154,147
Insurance Commissions and Fees [Member]
Noninterest Income
Service charges on deposit account fees	$ 23,996	$ 20,853	$ 46,644	$ 42,473
Deposit Account [Member]
Noninterest Income
Service charges on deposit account fees	16,390	16,030	32,810	32,386
Card-Based and Loan Fees [Member]
Noninterest Income
Service charges on deposit account fees	14,387	13,764	27,809	26,229
Fiduciary and Trust [Member]
Noninterest Income
Service charges on deposit account fees	13,437	12,346	26,806	24,281
Brokerage Commission and Fees [Member]
Noninterest Income
Service charges on deposit account fees	$ 6,896	$ 4,346	$ 14,169	$ 8,679

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 89,192	$ 57,983	$ 158,648	$ 114,253
Investment securities available for sale
Net unrealized gains (losses)	(18,919)	15,218	(60,754)	18,370
Net unrealized gain (loss) on available for sale securities transferred to held to maturity securities	0	(9,474)	0	(14,738)
Amortization of net unrealized gain (loss) on available for sale securities transferred to held to maturity securities	(335)	(1,548)	(632)	(2,575)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	2,015	0	2,015	0
Reclassification from OCI due to change in accounting principle	0	0	(84)	0
Reclassification of certain tax effects from OCI	0	0	(8,419)	0
Income tax (expense) benefit	4,705	(1,601)	15,340	(406)
Other comprehensive income (loss) on investment securities available for sale	(12,533)	2,595	(52,533)	651
Defined benefit pension and postretirement obligations
Amortization of prior service cost	38	37	(76)	75
Amortization of actuarial loss (gains)	(465)	(487)	929	(975)
Reclassification of certain tax effects from OCI	0	0	(5,235)	0
Income tax (expense) benefit	109	171	(216)	342
Other comprehensive income (loss) on pension and postretirement obligations	318	279	(4,597)	558
Total other comprehensive income (loss)	12,215	(2,874)	57,130	(1,209)
Comprehensive income	$ 76,977	$ 60,857	$ 101,518	$ 115,462

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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, 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 ($0.12 per share in 2016 and $0.15 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)
Beginning balance at Dec. 31, 2017	3,237,443	159,929	1,618	1,454,188	1,819,230	(62,758)	(134,764)
Comprehensive income:
Net income	158,648	0	0	0	158,648	0	0
Other comprehensive income	57,130	0	0	0	0		0
AOCI Loss Net of ASU Adoption and Tax	(43,392)					(43,392)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(13,738)	0	0	0	0	(13,738)	0
Comprehensive income	101,518
Common stock issued:
Stock-based compensation plans, net	16,147	0	0	2,702	(15,176)	0	28,621
Stock Issued for Bank Mutual Acquisitions	488,408	0	137	396,975	0	0	91,296
Purchase of common stock returned to authorized but unissued	(33,075)		(14)	(33,061)	0	0	0
Purchase of treasury stock	(5,717)	0	0	0	0	0	(5,717)
Cash dividends:
Common stock dividends ($0.12 per share in 2016 and $0.15 per share in 2017)	(51,817)	0	0	0	(51,817)	0	0
Preferred stock dividends	(4,668)	0	0	0	(4,668)	0	0
Preferred Stock Redemption Premium	(646)	(528)	0	0	(118)	0	0
Proceeds from Warrant Exercises	0	0	10	(10)	0	0	0
Stock-based compensation expense, net	8,172	0	0	8,172	0	0	0
Tax Act Reclassification (2018-2)	13,654	0	0	0	13,654		0
Change in Equity Securities(2016-01)	84	0	0	0	84		0
Other	742	0	0	0	742	0	0
Ending balance at Jun. 30, 2018	$ 3,770,244	$ 159,401	$ 1,751	$ 1,828,965	$ 1,920,579	$ (119,888)	$ (20,564)

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 89,192	$ 57,983	$ 158,648	$ 114,253
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	4,000	12,000	4,000	21,000
Depreciation and amortization			24,249	23,241
Addition to (recovery of) valuation allowance on mortgage servicing rights, net			(607)	275
Amortization of mortgage servicing rights			4,649	5,084
Amortization of other intangible assets	2,168	496	3,693	1,009
Amortization and accretion on earning assets, funding, and other, net			423	17,889
Other Depreciation and Amortization			9,770	5,165
Gain on sales of investment securities, net			2,015	(356)
Asset (gains) losses, net	(2,497)	466	(2,390)	700
(Gain) loss on mortgage banking activities, net			261	4,287
Mortgage loans originated and acquired for sale			(516,285)	(220,284)
Proceeds from sales of mortgage loans held for sale			482,080	364,128
Payment for Pension Benefits			(31,371)	0
(Increase) decrease in interest receivable			(14,569)	(757)
Increase (decrease) in interest payable			3,775	2,653
Other, net			(11,807)	(18,849)
Net cash provided by operating activities			116,534	319,438
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans			(338,781)	(819,198)
Purchases of:
Available for sale securities			(655,949)	(417,397)
Held to maturity securities			(429,964)	(70,969)
Federal Home Loan Bank and Federal Reserve Bank stocks			(238,190)	(166,869)
Premises, equipment, and software, net of disposals			(23,932)	(19,289)
Proceeds from:
Sales of available for sale securities			493,060	0
Sales of held to maturity securities			0	16,059
Proceeds from Sale of Federal Home Loan Bank Stock			174,506	125,690
Prepayments, calls, and maturities of available for sale investment securities			330,517	389,251
Prepayments, calls, and maturities of held to maturity investment securities			121,612	80,976
Sales, prepayments, calls, and maturities of other assets			9,640	5,840
Net Change in Tax Credit Investments [Line Items]			(18,842)	(30,833)
Net cash (paid) received in acquisition			59,472	(217)
Net cash used in investing activities			(516,851)	(906,956)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits			(810,598)	(270,268)
Proceeds from (Repayments of) Short-term Debt			(481,920)	95,447
ProceedsFromRepaymentsOfFHLBAdvances			1,527,966	714,988
Proceeds from issuance of common stock for stock-based compensation plans			16,147	20,945
Payments for Repurchase of Redeemable Preferred Stock			(646)	0
Purchase of common stock returned to authorized but unissued			(33,075)	0
Purchase of treasury stock for tax withholding			(5,717)	(8,445)
Cash dividends on common stock			(51,817)	(36,804)
Cash dividends on preferred stock			(4,668)	(4,669)
Net cash provided by financing activities			155,672	511,194
Net increase (decrease) in cash and cash equivalents			(244,645)	(76,324)
Cash and cash equivalents at beginning of period			716,018	642,233	$ 642,233
Cash and cash equivalents at end of period	471,373	565,909	471,373	565,909	$ 716,018
Supplemental disclosures of cash flow information:
Cash paid for interest			112,392	57,306
Cash paid for income taxes			12,674	27,461
Loans and bank premises transferred to other real estate owned			21,299	3,267
Capitalized mortgage servicing rights			4,502	3,278
Loans transferred into held for sale from portfolio, net			12,709	66,181
Unsettled Trades To Purchase Securities			15,339	0
Fair value of assets acquired, including cash and cash equivalents	2,569,700	0	2,569,700	0
Fair value ascribed to goodwill and intangible assets	258,885	217	258,885	217
Fair value of liabilities assumed	2,828,448	0	2,828,448	0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable			137	0
Restricted Cash	85,416	98,913	85,416	98,913
Cash Equivalents, at Carrying Value	$ 385,957	$ 466,996	$ 385,957	$ 466,996

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Basis of Presentation

6 Months Ended

Jun. 30, 2018

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.

Within the tables presented, certain columns and rows may not sum due to the use of rounded numbers for disclosure purposes.

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Acquisitions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Acquisitions

Acquisitions

Bank Mutual Acquisition

On February 1, 2018, the Corporation completed its acquisition of Bank Mutual Corporation ("Bank Mutual") in a stock transaction valued at approximately $482 million. Bank Mutual was a diversified financial services company headquartered in Milwaukee, Wisconsin. The merger resulted in a combined company with a larger market presence in markets the Corporation currently operates in, as well as expansion into nearly a dozen new markets. The merger is also expected to provide significant efficiency opportunities and economies of scale associated with a larger financial institution.

Under the terms of the Agreement and Plan of Merger dated July 20, 2017 (the "Merger Agreement"), Bank Mutual’s shareholders received 0.422 shares of the Corporation's common stock for each share of Bank Mutual common stock. The Corporation issued approximately 19.5 million shares for a total deal value of approximately $482 million based on the closing sale price of a share of common stock of the Corporation on January 31, 2018. The Corporation completed the conversion of Bank Mutual in the second quarter of 2018. The banking subsidiary of Bank Mutual merged with and into Associated Bank, N.A. on June 24, 2018.

The acquisition of Bank Mutual constituted a business combination. The merger has been accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair value on the acquisition date. The determination of estimated fair values required management to make certain estimates that are subjective in nature and may require adjustments upon the availability of new information regarding facts and circumstances which existed at the date of acquisition (i.e., appraisals) for up to a year following the acquisition. The Corporation continues to review information relating to events or circumstances existing at the acquisition date. Management anticipates that this review could result in adjustments to the acquisition date valuation amounts presented herein but does not anticipate that these adjustments will be material.

Goodwill related to the Bank Mutual acquisition increased $6 million during the second quarter of 2018 to $173 million. Upon review of information relating to events and circumstances existing at the acquisition date, and in accordance with applicable accounting guidance, the Corporation remeasured select previously reported fair value amounts. Based on updated appraisal information, the fair value of premises and equipment decreased by $6 million and the fair value of other real estate owned increased by $1 million. Additionally, the fair value of loans was increased by less than $1 million due to an updated appraisal and other adjustments. Goodwill created by the acquisition of Bank Mutual is not tax deductible. See Note 8 for additional information on goodwill, as well as the carrying amount and amortization of core deposit and other intangible assets related to the Bank Mutual acquisition.

The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Bank Mutual.

	Purchase Accounting Adjustments			February 1, 2018
	($ in Thousands)
Assets
Cash and cash equivalents	$	—		$	78,052
Investment securities	(6,238		)	452,867
Federal Home Loan Bank stock, at cost	—			20,026
Loans	(48,043		)	1,875,877
Premises and equipment, net	5,180			44,939
Bank owned life insurance	(24		)	65,390
Goodwill				173,243
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet)	58,100			58,100
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet)	989			5,638
Others assets	$	6,153		$	46,257
Total assets				$	2,820,389
Liabilities
Deposits	$	2,498		$	1,840,950
Other borrowings	1,875			431,886
Other liabilities	$	4,370		$	65,864
Total liabilities				$	2,338,701
Total consideration paid				$	481,688

The following is a description of the methods used to determine the fair value of significant assets and liabilities presented on the balance sheet above.

Loans: Fair values for loans were based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan, amortization status and current discount rates. Loans were grouped together according to similar characteristics when applying various valuation techniques.

Core deposit intangible ("CDI"): This intangible asset represents the value of the relationships with deposit customers. The fair value was estimated based on a discounted cash flow methodology that gave appropriate consideration to expected customer attrition rates, net maintenance cost of the deposit base, alternative cost of funds, and the interest costs associated with customer deposits. The CDI is being amortized on a straight-line basis over 10 years.

Time deposits: The fair values for time deposits are estimated using a discounted cash flow calculation that applies interest rates currently being offered to the contractual interest rates on such time deposits.

Federal Home Loan Bank ("FHLB") borrowings: The fair values of FHLB advances are estimated based on quoted market prices for the instrument if available, or for similar instruments if not available, or by using discounted cash flow analyses, based on current incremental borrowing rates for similar types of instruments.

See Note 13 for additional information on fair value measurements.

Other Acquisitions

During the second quarter of 2018, the Corporation completed the acquisition of Anderson Insurance & Investment Agency, Inc. ("Anderson"), an independent insurance agency based in Minneapolis, Minnesota. Anderson adds a range of complementary services and significant expertise in workers' compensation and executive risk management services. The transaction was valued at approximately $10 million. As a result of the acquisition, the Corporation recorded goodwill of approximately $7 million and added approximately $3 million of other intangibles related to customer relationships associated with the Anderson acquisition. The other intangibles related to the acquisition are being amortized on a straight-line basis over 7 years. See Note 8 for more information on goodwill and other intangible assets.

During the first quarter of 2018, the Corporation completed the acquisition of Diversified Insurance Solutions ("Diversified"). The acquisition improved Associated Benefits and Risk Consulting's ability to achieve greater scale in the Metro Milwaukee

market and to further expand its Wisconsin employee benefits and property and casualty market position and capabilities. The transaction was valued at approximately $19 million. As a result of the acquisition, the Corporation recorded goodwill of approximately $10 million and other intangibles of approximately $8 million. The other intangibles related to the acquisition are being amortized on a straight-line basis over 10 years. See Note 8 for more information on goodwill and other intangible assets.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

The accounting and reporting policies of the Corporation conform to U.S. generally accepted accounting principles and to general practice within the financial services industry. A discussion of these policies can be found in Note 1 Summary of Significant Accounting Policies section included in the Corporation’s 2017 Annual Report on Form 10-K. There have been two changes to the Corporation's significant accounting policies since December 31, 2017.

Business combinations

The Corporation accounts for its acquisitions using the purchase accounting method. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets that must be recognized. Typically, this allocation results in the purchase price exceeding the fair value of net assets acquired, which is recorded as goodwill. Core deposit intangibles are a measure of the value of checking, money market and savings deposits acquired in business combinations accounted for under the purchase method. Core deposit intangibles and other identified intangibles with finite useful lives are amortized using the straight line method over their estimated useful lives of up to ten years.

Loans that the Corporation acquires in connection with acquisitions are recorded at fair value with no carryover of the related allowance for credit losses. Fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. The excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. If a reasonable expectation on the amount or timing of such cash flows can't be determined, accretion of the fair value discount for nonperforming loans will be recognized using the cost recovery method of accounting.

The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the non-accretable discount. The non-accretable discount includes estimated future credit losses expected to be incurred over the life of the loan. Subsequent decreases to the expected cash flows will require the Corporation to evaluate the need for an additional allowance for credit losses. Subsequent improvement in expected cash flows will result in the reversal of a corresponding amount of the non-accretable discount which the Corporation will then reclassify as accretable discount that will be recognized into interest income over the remaining life of the loan.

The Corporation accounts for performing loans acquired in business combinations using the contractual cash flows method of recognizing discount accretion based on the acquired loans’ contractual cash flows. Purchased performing loans are recorded at fair value, including credit, interest, and liquidity discounts. The fair value discount is accreted as an adjustment to yield over the estimated lives of the loans. There is no allowance for loan losses established at the acquisition date for purchased performing loans. A provision for loan losses is recorded for any further deterioration in these loans subsequent to the acquisition.

Revenue Recognition

The Corporation recognizes revenue in accordance with ASC 606, "Revenue from Contracts with Customers." ASC 606 requires the Corporation to follow a five step process: (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. Revenue recognition under ASC 606 depicts 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 the goods or services.

New Accounting Pronouncements Adopted

Standard	Description	Date of adoption	Effect on financial statements
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The FASB issued an amendment to allow a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption of the update is permitted and should be applied in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate related to the Tax Cut and Jobs Act of 2017 is recognized.	1st Quarter 2018	The Corporation has elected to early adopt this amendment. During the quarter, the Corporation reclassified approximately $14 million from accumulated other comprehensive income to retained earnings as a result of the Tax Cuts and Jobs Act. No material impact on results of operations, financial position, or liquidity. See Consolidated Statements of Comprehensive Income and the Statement of Changes in Stockholders' Equity.
ASU 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The FASB issued an amendment to better align a company’s financial reporting for hedging activities with the economic objectives of those activities for both financial (e.g., interest rate) and commodity risks. The provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also contains targeted improvements to simplify the application of hedge accounting guidance. This amendment is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Entities should apply the amendment on a modified retrospective transition method in which the cumulative effect of the change will be recognized within equity in the consolidated balance sheet as of the date of adoption. Early adoption is permitted, including in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes the interim period.	1st Quarter 2018	The Corporation has elected to early adopt this amendment. No material impact on results of operations, financial position, or liquidity. See Note 10 for expanded disclosures.
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 an amendment 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	No impact on results of operations, financial position, or liquidity. The Update required retrospective restatement. For the full year 2017, the Corporation reclassified approximately $9 million from personnel expense to other noninterest expense for the non-service cost components of net periodic pension cost and net periodic postretirement benefit cost. See Note 14 for expanded disclosure.
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 if: (1) 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) the asset group does not include a minimum of an input and a substantive process, it does not represent a business, and (3) 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, then 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	No material impact on results of operations, financial position, or 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	No impact on results of operations, financial position, or liquidity. See Consolidated Statements of Cash Flows.

Standard	Description	Date of adoption	Effect on financial statements
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 on results of operations, financial position, or 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 from 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 bank owned life insurance) should be classified as cash inflows from investing, while the cash payments for the premiums may be classified as cash outflows from 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	No material impact on results of operations, financial position, or 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 has adopted this amendment and is using the cumulative-effect adjustment as of the beginning of the fiscal year of adoption. No material impact on the result of operations, financial position or liquidity. In 2008, the Corporation received Visa Class B restricted shares as part of Visa’s initial public offering. Based on the existing transfer restriction and the uncertainty of the covered litigation, the approximately 119 thousand Class B shares remaining that the Corporation owned as of June 30, 2018 are carried at a zero cost basis. See Consolidated Statements of Comprehensive Income and Note 13 Fair Value Measurements.
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.	1st Quarter 2018	The Corporation chose to adopt this amendment using the modified retrospective approach with no material impact on the Corporation's results of operations, financial position, or liquidity. See Note 17 for expanded disclosure requirements.

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Earnings Per Common Share

6 Months Ended

Jun. 30, 2018

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,
	2018			2017			2018			2017
	(In Thousands, except per share data)
Net income	$	89,192		$	57,983		$	158,648		$	114,253
Preferred stock dividends	(2,329		)	(2,339		)	(4,668		)	(4,669		)
Net income available to common equity	$	86,863		$	55,644		$	153,980		$	109,584
Common shareholder dividends	(25,977		)	(18,326		)	(51,549		)	(36,577		)
Unvested share-based payment awards	(130		)	(110		)	(269		)	(227		)
Undistributed earnings	$	60,756		$	37,208		$	102,162		$	72,780
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Undistributed earnings allocated to unvested share-based payment awards	310			228			485			507
Undistributed earnings	$	60,756		$	37,208		$	102,162		$	72,780
Basic
Distributed earnings to common shareholders	$	25,977		$	18,326		$	51,549		$	36,577
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Total common shareholders earnings, basic	$	86,423		$	55,306		$	153,226		$	108,850
Diluted
Distributed earnings to common shareholders	$	25,977		$	18,326		$	51,549		$	36,577
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Total common shareholders earnings, diluted	$	86,423		$	55,306		$	153,226		$	108,850
Weighted average common shares outstanding	170,633			151,573			167,096			151,196
Effect of dilutive common stock awards	2,146			1,958			2,080			2,155
Effect of dilutive common stock warrants	630			771			744			796
Diluted weighted average common shares outstanding	173,409			154,302			169,920			154,147
Basic earnings per common share	$	0.51		$	0.36		$	0.92		$	0.72
Diluted earnings per common share	$	0.50		$	0.36		$	0.90		$	0.71

Anti-dilutive common stock options of approximately 1.5 million and 1 million for the three months ended June 30, 2018 and 2017, respectively, and 1.4 million and 900,000 for the six months ended June 30, 2018 and 2017, respectively, were excluded from the earnings per common share calculation.

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2018

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.

Performance awards are based on performance goals of earnings per share and total shareholder return with vesting ranging from a minimum of 25% to a maximum of 150% of the target award. Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date.

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 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 2018 and full year 2017.

	2018		2017
Dividend yield	2.50	%	2.00	%
Risk-free interest rate	2.60	%	2.00	%
Weighted average expected volatility	22.00	%	25.00	%
Weighted average expected life	5.75 years		5.5 years
Weighted average per share fair value of options	$4.47		$5.30

A summary of the Corporation’s stock option activity for the six months ended June 30, 2018 is presented below.

Stock Options	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value(a)
Outstanding at December 31, 2017	5,118,687		$	18.02	6.48	$	38,028
Granted	938,740		24.50
Assumed from Bank Mutual acquisition	370,051		14.35
Exercised	(888,661	)	16.69
Forfeited or expired	(38,613	)	24.21
Outstanding at June 30, 2018	5,500,204		$	19.05	6.69	$	45,418
Options Exercisable at June 30, 2018	3,287,488		$	16.80	5.39	$	34,551

(a) $ in Thousands

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, 2018, the intrinsic value of stock options exercised was approximately $9 million. For the six months ended June 30, 2017, the intrinsic value of the stock options exercised was $11 million. The total fair value of stock options vested was $4 million for the six months ended June 30, 2018 and June 30, 2017. The Corporation recognized compensation expense for the vesting of stock options of $2 million for both the six months ended June 30, 2018 and June 30, 2017. Included in compensation expense for 2018 was less than $1 million of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At June 30, 2018, 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 through first quarter 2022.

The following table summarizes information about the Corporation’s restricted stock activity for the six months ended June 30, 2018.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	2,026,071		$	19.68
Granted	573,877		24.65
Vested	(537,881	)	18.21
Forfeited	(30,480	)	22.16
Outstanding at June 30, 2018	2,031,587		$	21.87

The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant's award agreement. Performance-based restricted stock awards granted during 2017 and 2018 will vest ratably over a three year period. Service-based restricted stock awards granted during 2017 and 2018 will vest ratably over a four year period. Expense for restricted stock awards issued of approximately $6 million was recorded for the six months ended June 30, 2018 and $11 million was recorded for the six months ended June 30, 2017. Included in compensation expense for 2018 was approximately $1 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $25 million of unrecognized compensation costs related to restricted stock awards at June 30, 2018, that is expected to be recognized over the remaining requisite service periods that extend through first quarter 2022.

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, 2018

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”). A portion of the portfolio is also comprised of asset-backed securities backed by student loans made under the Federal Family Education Loan Program ("FFELP"). The amortized cost and fair values of securities available for sale and held to maturity were as follows.

June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,001	$	—	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	396,368		5,573		(5,232		)	396,709
GNMA	2,275,481		23		(65,315		)	2,210,189
Private-label	1,037		—		(5		)	1,031
GNMA commercial mortgage-related securities	1,400,680		—		(52,399		)	1,348,282
FFELP asset backed securities	298,263		1,679		(111		)	299,831
Other debt securities	3,000		—		—			3,000
Other equity securities	1,613		—		—			1,613
Total investment securities available for sale	$	4,377,443	$	7,275	$	(123,068	)	$	4,261,651
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,593,147	$	4,851	$	(17,698	)	$	1,580,300
Residential mortgage-related securities
FNMA / FHLMC	97,822		191		(2,306		)	95,707
GNMA	388,174		1,969		(13,020		)	377,123
GNMA commercial mortgage-related securities	523,103		8,542		(23,832		)	507,813
Total investment securities held to maturity	$	2,602,247	$	15,553	$	(56,856	)	$	2,560,943

December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,003	$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	457,680		9,722		(2,634		)	464,768
GNMA	1,944,453		275		(31,378		)	1,913,350
Private-label	1,067		—		(8		)	1,059
GNMA commercial mortgage-related securities	1,547,173		5		(33,901		)	1,513,277
FFELP asset backed securities	144,322		867		(13		)	145,176
Other debt securities	3,200		—		(12		)	3,188
Other equity securities	1,519		127		(14		)	1,632
Total investment securities available for sale	$	4,100,417	$	10,996	$	(67,967	)	$	4,043,446
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,281,320	$	13,899	$	(3,177	)	$	1,292,042
Residential mortgage-related securities
FNMA / FHLMC	40,995		398		(489		)	40,904
GNMA	414,440		2,700		(6,400		)	410,740
GNMA commercial mortgage-related securities	546,098		9,546		(15,756		)	539,888
Total investment securities held to maturity	$	2,282,853	$	26,543	$	(25,822	)	$	2,283,574

The expected maturities of investment securities available for sale and held to maturity at June 30, 2018 are shown below. Expected maturities may 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	$	3,001	$	2,996		$	46,938	$	47,269
Due after one year through five years	1,000		1,000			200,725		199,266
Due after five years through ten years	—		—			366,997		361,260
Due after ten years	—		—			978,487		972,504
Total debt securities	4,001		3,996			1,593,147		1,580,300
Residential mortgage-related securities
FNMA / FHLMC	396,368		396,709			97,822		95,707
GNMA	2,275,481		2,210,189			388,174		377,123
Private-label	1,037		1,031			—		—
GNMA commercial mortgage-related securities	1,400,680		1,348,282			523,103		507,813
FFELP asset backed securities	298,263		299,831			—		—
Equity securities	1,613		1,613			—		—
Total investment securities	$	4,377,443	$	4,261,651		$	2,602,247	$	2,560,943
Ratio of Fair Value to Amortized Cost			97.4		%			98.4		%

The proceeds from the sale of investment securities for the six months ended June 30, 2018 and 2017 are shown below.

	Six Months Ended June 30,
	2018			2017
	($ in Thousands)
Gross gains on available for sale securities	$	—		$	—
Gross gains on held to maturity securities	—			361
Total gains	—			361
Gross losses on available for sale securities	(2,015		)	—
Gross losses on held to maturity securities	$	—		$	(5	)
Total losses	$	(2,015	)	$	(5	)
Investment securities gains (losses), net	$	(2,015	)	$	356
Proceeds from sales of investment securities	$	493,060		$	16,059

During the first six months of 2018, the Corporation sold approximately $40 million of lower yielding GNMA commercial mortgage-related securities. In addition, on the acquisition date, the Corporation sold Bank Mutual's entire $453 million securities portfolio.

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.

Investment securities with a carrying value of approximately $3.1 billion at both June 30, 2018 and December 31, 2017 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, 2018.

	Less than 12 months						12 months or more						Total
June 30, 2018	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	$	(6	)	$	996	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	19	(1,613		)	100,946		9	(3,620		)	128,509		(5,233		)	229,455
GNMA	62	(31,430		)	1,453,394		29	(33,885		)	756,061		(65,315		)	2,209,455
Private-label	—	—			—		1	(5		)	1,031		(5		)	1,031
GNMA commercial mortgage-related securities	22	(8,821		)	284,733		80	(43,577		)	1,063,701		(52,398		)	1,348,434
FFELP asset backed securities	7	(111		)	100,757		—	—			—		(111		)	100,757
Total	110	$	(41,975	)	$	1,939,830	120	$	(81,093	)	$	1,950,298	$	(123,068	)	$	3,890,128
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	890	$	(10,814	)	$	609,381	142	$	(6,884	)	$	128,244	$	(17,698	)	$	737,625
Residential mortgage-related securities
FNMA / FHLMC	25	(1,518		)	76,046		10	(788		)	14,728		(2,306		)	90,774
GNMA	61	(7,062		)	236,008		20	(5,957		)	137,093		(13,019		)	373,101
GNMA commercial mortgage-related securities	1	(813		)	29,243		24	(23,019		)	478,570		(23,832		)	507,813
Total	977	$	(20,207	)	$	950,678	196	$	(36,648	)	$	758,635	$	(56,856	)	$	1,709,313

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, 2017.

	Less than 12 months						12 months or more						Total
December 31, 2017	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U.S. Treasury securities	1	$	(7	)	$	996	—	$	—		$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	9	(572		)	69,939		9	(2,062		)	142,093		(2,634		)	212,032
GNMA	44	(8,927		)	1,028,221		25	(22,451		)	737,198		(31,378		)	1,765,419
Private-label	—	—			—		1	(8		)	1,059		(8		)	1,059
GNMA commercial mortgage-related securities	33	(5,554		)	480,514		70	(28,347		)	1,026,642		(33,901		)	1,507,156
FFELP asset backed securities	1	(13		)	12,158		—	—			—		(13		)	12,158
Other debt securities	1	(12		)	188		—	—			—		(12		)	188
Other equity securities	3	(14		)	1,487		—	—			—		(14		)	1,487
Total	92	$	(15,099	)	$	1,593,503	105	$	(52,868	)	$	1,906,992	$	(67,967	)	$	3,500,495
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	157	$	(746	)	$	122,761	132	$	(2,431	)	$	127,043	$	(3,177	)	$	249,804
Residential mortgage-related securities
FNMA / FHLMC	8	(73		)	13,143		10	(417		)	16,262		(490		)	29,405
GNMA	35	(3,373		)	268,388		18	(3,026		)	120,892		(6,399		)	389,280
GNMA commercial mortgage-related securities	2	(299		)	52,997		23	(15,457		)	486,891		(15,756		)	539,888
Total	202	$	(4,491	)	$	457,289	183	$	(21,331	)	$	751,088	$	(25,822	)	$	1,208,377

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, 2018 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 unrealized losses at June 30, 2018 for mortgage-related securities is due to the increase in overall interest rates. The U.S. Treasury 3 year and 5 year rates increased by 65 bp and 53 bp, respectively, from December 31, 2017. The Corporation does not intend to sell nor does it believe that it will be required to sell the securities in an unrealized loss position 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, 2018, and December 31, 2017, the Corporation had FHLB stock of $173 million and $89 million, respectively. The Corporation had Federal Reserve Bank stock of $76 million at both June 30, 2018 and December 31, 2017.

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Loans

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Loans

Loans

The period end loan composition was as follows.

	June 30, 2018(a)		December 31, 2017
	($ in Thousands)
Commercial and industrial	$	7,109,796	$	6,399,693
Commercial real estate — owner occupied	888,330		802,209
Commercial and business lending	7,998,126		7,201,902
Commercial real estate — investor	3,996,415		3,315,254
Real estate construction	1,487,159		1,451,684
Commercial real estate lending	5,483,574		4,766,938
Total commercial	13,481,700		11,968,840
Residential mortgage	8,207,253		7,546,534
Home equity	911,363		883,804
Other consumer	376,470		385,813
Total consumer	9,495,086		8,816,151
Total loans	$	22,976,786	$	20,784,991

(a) Includes $16 million of purchased credit-impaired loans

The following table presents commercial and consumer loans by credit quality indicator at June 30, 2018.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,763,557	$	92,286	$	172,177	$	81,776	$	7,109,796
Commercial real estate - owner occupied	814,769		16,033		38,879		18,649		888,330
Commercial and business lending	7,578,326		108,319		211,056		100,425		7,998,126
Commercial real estate - investor	3,885,535		59,587		24,790		26,503		3,996,415
Real estate construction	1,452,888		29,559		3,168		1,544		1,487,159
Commercial real estate lending	5,338,423		89,146		27,958		28,047		5,483,574
Total commercial	12,916,749		197,465		239,014		128,472		13,481,700
Residential mortgage	8,141,803		199		2,355		62,896		8,207,253
Home equity	897,471		792		142		12,958		911,363
Other consumer	375,624		706		6		134		376,470
Total consumer	9,414,898		1,697		2,503		75,988		9,495,086
Total	$	22,331,647	$	199,162	$	241,517	$	204,460	$	22,976,786

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2017.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,015,884	$	157,245	$	113,778	$	112,786	$	6,399,693
Commercial real estate - owner occupied	723,291		14,181		41,997		22,740		802,209
Commercial and business lending	6,739,175		171,426		155,775		135,526		7,201,902
Commercial real estate - investor	3,266,389		24,845		19,291		4,729		3,315,254
Real estate construction	1,421,504		29,206		—		974		1,451,684
Commercial real estate lending	4,687,893		54,051		19,291		5,703		4,766,938
Total commercial	11,427,068		225,477		175,066		141,229		11,968,840
Residential mortgage	7,490,860		426		1,616		53,632		7,546,534
Home equity	868,958		1,137		195		13,514		883,804
Other consumer	384,990		652		—		171		385,813
Total consumer	8,744,808		2,215		1,811		67,317		8,816,151
Total	$	20,171,876	$	227,692	$	176,877	$	208,546	$	20,784,991

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, 2018.

	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	$	7,027,210	$	407	$	181	$	222	$	81,776	$	7,109,796
Commercial real estate - owner occupied	869,488		193		—		—		18,649		888,330
Commercial and business lending	7,896,698		600		181		222		100,425		7,998,126
Commercial real estate - investor	3,969,084		828		—		—		26,503		3,996,415
Real estate construction	1,465,850		19,765		—		—		1,544		1,487,159
Commercial real estate lending	5,434,934		20,593		—		—		28,047		5,483,574
Total commercial	13,331,632		21,193		181		222		128,472		13,481,700
Residential mortgage	8,135,016		9,158		183		—		62,896		8,207,253
Home equity	891,135		6,534		736		—		12,958		911,363
Other consumer	372,984		972		763		1,617		134		376,470
Total consumer	9,399,135		16,664		1,682		1,617		75,988		9,495,086
Total	$	22,730,767	$	37,857	$	1,863	$	1,839	$	204,460	$	22,976,786

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2018 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans, $141 million or 69% were current with respect to payment at June 30, 2018.

The following table presents loans by past due status at December 31, 2017.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due(a)		Nonaccrual(b)		Total
	($ in Thousands)
Commercial and industrial	$	6,286,369	$	170	$	101	$	267	$	112,786	$	6,399,693
Commercial real estate - owner occupied	779,421		48		—		—		22,740		802,209
Commercial and business lending	7,065,790		218		101		267		135,526		7,201,902
Commercial real estate - investor	3,310,000		374		—		151		4,729		3,315,254
Real estate construction	1,450,459		168		83		—		974		1,451,684
Commercial real estate lending	4,760,459		542		83		151		5,703		4,766,938
Total commercial	11,826,249		760		184		418		141,229		11,968,840
Residential mortgage	7,483,350		9,186		366		—		53,632		7,546,534
Home equity	863,465		5,688		1,137		—		13,514		883,804
Other consumer	382,186		1,227		780		1,449		171		385,813
Total consumer	8,729,001		16,101		2,283		1,449		67,317		8,816,151
Total	$	20,555,250	$	16,861	$	2,467	$	1,867	$	208,546	$	20,784,991

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2017 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans, $135 million or 65% were current with respect to payment at December 31, 2017.

The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $16 million of purchased credit-impaired loans, at June 30, 2018.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	75,928	$	77,873	$	17,628	$	70,082	$	725
Commercial real estate — owner occupied	15,386		15,853		829		15,649		95
Commercial and business lending	91,314		93,726		18,457		85,731		820
Commercial real estate — investor	15,397		15,469		4,132		15,485		901
Real estate construction	448		523		77		456		15
Commercial real estate lending	15,845		15,992		4,209		15,941		916
Total commercial	107,159		109,718		22,666		101,672		1,736
Residential mortgage	39,926		44,171		6,208		39,433		863
Home equity	9,817		10,809		3,514		9,917		282
Other consumer	1,049		1,051		109		1,051		1
Total consumer	50,792		56,031		9,831		50,401		1,146
Total loans(a)	$	157,951	$	165,749	$	32,497	$	152,073	$	2,882
Loans with no related allowance
Commercial and industrial	$	35,065	$	47,914	$	—	$	39,201	$	(286	)
Commercial real estate — owner occupied	4,869		5,920		—		4,179		24
Commercial and business lending	39,934		53,834		—		43,380		(262		)
Commercial real estate — investor	984		1,031		—		1,006		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	984		1,031		—		1,006		—
Total commercial	40,918		54,865		—		44,386		(262		)
Residential mortgage	11,543		11,862		—		7,839		128
Home equity	1,275		1,289		—		785		12
Other consumer	—		—		—		—		—
Total consumer	12,818		13,151		—		8,624		140
Total loans(a)	$	53,736	$	68,016	$	—	$	53,010	$	(122	)
Total
Commercial and industrial	$	110,993	$	125,787	$	17,628	$	109,283	$	439
Commercial real estate — owner occupied	20,255		21,773		829		19,828		119
Commercial and business lending	131,248		147,560		18,457		129,111		558
Commercial real estate — investor	16,381		16,500		4,132		16,491		901
Real estate construction	448		523		77		456		15
Commercial real estate lending	16,829		17,023		4,209		16,947		916
Total commercial	148,077		164,583		22,666		146,058		1,474
Residential mortgage	51,469		56,033		6,208		47,272		991
Home equity	11,092		12,098		3,514		10,702		294
Other consumer	1,049		1,051		109		1,051		1
Total consumer	63,610		69,182		9,831		59,025		1,286
Total loans(a)	$	211,687	$	233,765	$	32,497	$	205,083	$	2,760

(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, 2018.

The following table presents impaired loans individually evaluated under ASC Topic 310 at December 31, 2017. 

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	81,649	$	83,579	$	10,838	$	58,494	$	2,629
Commercial real estate — owner occupied	23,796		23,937		2,973		12,124		736
Commercial and business lending	105,445		107,516		13,811		70,618		3,365
Commercial real estate — investor	17,823		17,862		1,597		16,924		1,694
Real estate construction	467		578		86		484		29
Commercial real estate lending	18,290		18,440		1,683		17,408		1,723
Total commercial	123,735		125,956		15,494		88,026		5,088
Residential mortgage	40,561		42,922		6,512		40,411		1,614
Home equity	10,250		10,986		3,718		10,521		549
Other consumer	1,135		1,138		122		1,140		3
Total consumer	51,946		55,046		10,352		52,072		2,166
Total loans(a)	$	175,681	$	181,002	$	25,846	$	140,098	$	7,254
Loans with no related allowance
Commercial and industrial	$	60,595	$	82,839	$	—	$	89,275	$	492
Commercial real estate — owner occupied	2,438		2,829		—		1,948		36
Commercial and business lending	63,033		85,668		—		91,223		528
Commercial real estate — investor	1,295		1,295		—		—		45
Real estate construction	—		—		—		—		—
Commercial real estate lending	1,295		1,295		—		—		45
Total commercial	64,328		86,963		—		91,223		573
Residential mortgage	6,925		7,204		—		4,999		217
Home equity	641		645		—		540		7
Other consumer	—		—		—		—		—
Total consumer	7,566		7,849		—		5,539		224
Total loans(a)	$	71,894	$	94,812	$	—	$	96,762	$	797
Total
Commercial and industrial	$	142,244	$	166,418	$	10,838	$	147,769	$	3,121
Commercial real estate — owner occupied	26,234		26,766		2,973		14,072		772
Commercial and business lending	168,478		193,184		13,811		161,841		3,893
Commercial real estate — investor	19,118		19,157		1,597		16,924		1,739
Real estate construction	467		578		86		484		29
Commercial real estate lending	19,585		19,735		1,683		17,408		1,768
Total commercial	188,063		212,919		15,494		179,249		5,661
Residential mortgage	47,486		50,126		6,512		45,410		1,831
Home equity	10,891		11,631		3,718		11,061		556
Other consumer	1,135		1,138		122		1,140		3
Total consumer	59,512		62,895		10,352		57,611		2,390
Total loans(a)	$	247,575	$	275,814	$	25,846	$	236,860	$	8,051

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 80% of the unpaid principal balance at December 31, 2017.

Troubled Debt Restructurings (“Restructured Loans”)

Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	June 30, 2018				December 31, 2017
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	32,438	$	155	$	30,047	$	1,776
Commercial real estate — owner occupied	3,820		—		3,989		—
Commercial real estate — investor	372		14,268		14,389		—
Real estate construction	222		226		310		157
Residential mortgage	17,934		20,372		17,068		18,991
Home equity	7,900		2,972		7,705		2,537
Other consumer	1,037		12		1,110		25
Total	$	63,723	$	38,005	$	74,618	$	23,486

(a) Nonaccrual restructured loans have been included within nonaccrual loans.

The Corporation had a recorded investment of approximately $4 million in loans modified in troubled debt restructurings during the six months ended June 30, 2018, of which less than $1 million were in accrual status and approximately $4 million were in nonaccrual pending a sustained period of repayment.

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the six months ended June 30, 2018 and 2017, respectively, and the recorded investment and unpaid principal balance as of June 30, 2018 and 2017, respectively.

	Six Months Ended June 30, 2018					Six Months Ended June 30, 2017
	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	1	$	47	$	47	24	$	30,935	$	52,260
Commercial real estate — owner occupied	—	—		—		2	716		716
Commercial real estate — investor	1	984		1,031		—	—		—
Residential mortgage	10	2,064		2,064		36	2,695		2,805
Home equity	10	935		949		26	674		919
Other consumer	1	5		8		—	—		—
Total	23	$	4,035	$	4,099	88	$	35,020	$	56,700

(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, 2018, 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, 2018.

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, 2018 and 2017, respectively, as well as the recorded investment in these restructured loans as of June 30, 2018 and 2017, respectively.

	Six Months Ended June 30, 2018			Six Months Ended June 30, 2017
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial and industrial	3	$	—	—	$	—
Residential mortgage	8	2,219		17	941
Home equity	21	1,409		9	271
Total	32	$	3,628	26	$	1,212

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

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.

The following table presents a summary of the changes in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018.

($ 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, 2017	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Charge offs	(19,611		)	(1,042		)	(1,202		)	(53		)	(956		)	(1,729		)	(2,488		)	(27,081		)
Recoveries	6,406			287			21			290			690			1,192			416			9,302
Net Charge offs	(13,205		)	(755		)	(1,181		)	237			(266		)	(537		)	(2,072		)	(17,779		)
Provision for loan losses	750			1,213			4,272			(5,455		)	1,796			(301		)	2,225			4,500
June 30, 2018	$	110,613		$	10,810		$	44,150		$	29,152		$	31,137		$	21,288		$	5,451		$	252,601
Allowance for loan losses
Individually evaluated for impairment	$	17,628		$	829		$	4,132		$	77		$	6,208		$	3,514		$	109		$	32,497
Collectively evaluated for impairment	92,985			9,981			40,018			29,075			24,929			17,774			5,342			220,104
Acquired and accounted for under ASC 310-30(a)	—			—			—			—			—			—			—			—
Total allowance for loan losses	$	110,613		$	10,810		$	44,150		$	29,152		$	31,137		$	21,288		$	5,451		$	252,601
Loans
Individually evaluated for impairment	$	110,993		$	20,255		$	16,381		$	448		$	51,469		$	11,092		$	1,049		$	211,687
Collectively evaluated for impairment	6,996,038			866,356			3,969,829			1,486,464			8,154,904			900,187			375,421			22,749,199
Acquired and accounted for under ASC 310-30(a)	2,765			1,719			10,205			247			880			84			—			15,900
Total loans	$	7,109,796		$	888,330		$	3,996,415		$	1,487,159		$	8,207,253		$	911,363		$	376,470		$	22,976,786

(a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality."

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2017, was as follows.

($ in Thousands)	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate -  investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2016	$	140,126		$	14,034		$	45,285		$	26,932		$	27,046		$	20,364		$	4,548		$	278,335
Charge offs	(44,533		)	(344		)	(991		)	(604		)	(2,611		)	(2,724		)	(4,439		)	(56,246		)
Recoveries	11,465			173			242			74			927			3,194			716			16,791
Net Charge offs	(33,068		)	(171		)	(749		)	(530		)	(1,684		)	470			(3,723		)	(39,455		)
Provision for loan losses	16,010			(3,511		)	(3,477		)	7,968			4,245			1,292			4,473			27,000
December 31, 2017	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Allowance for loan losses
Individually evaluated for impairment	$	10,838		$	2,973		$	1,597		$	86		$	6,512		$	3,718		$	122		$	25,846
Collectively evaluated for impairment	112,230			7,379			39,462			34,284			23,095			18,408			5,176			240,034
Total allowance for loan losses	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Loans
Individually evaluated for impairment	$	142,244		$	26,234		$	19,118		$	467		$	47,486		$	10,891		$	1,135		$	247,575
Collectively evaluated for impairment	6,257,449			775,975			3,296,136			1,451,217			7,499,048			872,913			384,678			20,537,416
Total loans	$	6,399,693		$	802,209		$	3,315,254		$	1,451,684		$	7,546,534		$	883,804		$	385,813		$	20,784,991

The allowance related to the oil and gas portfolio was $17 million at June 30, 2018 and represented 2.5% of total oil and gas loans.

($ in Millions)	Six Months Ended June 30, 2018			Year Ended December 31, 2017
Balance at beginning of period	$	27		$	38
Charge offs	(14		)	(25		)
Recoveries	3			—
Net Charge offs	(11		)	(25		)
Provision for loan losses	1			14
Balance at end of period	$	17		$	27
Allowance for loan losses
Individually evaluated for impairment	$	9		$	5
Collectively evaluated for impairment	8			22
Total allowance for loan losses	$	17		$	27
Loans
Individually evaluated for impairment	$	45		$	77
Collectively evaluated for impairment	637			523
Total loans	$	682		$	600

The following table presents a summary of the changes in the allowance for unfunded commitments.

	Six Months Ended June 30, 2018			Year Ended December 31, 2017
	($ in Thousands)
Allowance for Unfunded Commitments
Balance at beginning of period	$	24,400		$	25,400
Provision for unfunded commitments	(500		)	(1,000		)
Amount recorded at acquisition	2,436			—
Balance at end of period	$	26,336		$	24,400

Loans Acquired in Acquisition

Loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. Acquired loans are segregated into two types:

• Performing loans are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination.

• Nonperforming loans are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination.

For performing loans the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans.

In accordance with ASC 310-30, purchased credit-impaired loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows. If a reasonable expectation on the amount or timing of such cash flows cannot be determined, accretion of the fair value discount for nonperforming loans will be recognized using the cost recovery method of accounting.

Changes in the accretable yield for loans acquired and accounted for under ASC Topic 310-30 were as follows for the six months ended June 30, 2018 and for the year ended December 31, 2017

	Six Months Ended June 30, 2018			Year Ended December 31, 2017
	($ in Thousands)
Changes in Accretable Yield
Balance at beginning of period	$	—		$	—
Purchases	4,881			—
Accretion	(119		)	—
Balance at end of period	$	4,762		$	—

For loans acquired, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors.

At June 30, 2018, the Corporation had a total of approximately $32 million in net unaccreted purchase discount, of which approximately $26 million was related to performing loans and approximately $7 million was related to nonperforming loans.

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Goodwill and Other Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Other Intangible Assets

Goodwill

Goodwill is not amortized but is instead 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 2018, 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 2018 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 have been no events since the May 2018 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2017 or the first six months of 2018.

At June 30, 2018, the Corporation had goodwill of $1.2 billion, compared to $976 million at December 31, 2017. Goodwill increased $173 million related to the Bank Mutual acquisition, $10 million related to the acquisition of Diversified, and $7 million related to the acquisition of Anderson. 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 2018, the Corporation added approximately $58 million of core deposit intangibles as a result of the Bank Mutual acquisition. In addition, the Corporation added approximately $8 million of other intangibles relating to customer relationships associated with the Diversified acquisition. During the second quarter of 2018, the Corporation added approximately $3 million of other intangibles related to customer relationships associated with the Anderson 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Core deposit intangibles
Gross carrying amount	$	58,100		$	4,385
Accumulated amortization	(2,421		)	(4,385		)
Net book value	$	55,679		$	—
Additions during the periods	$	58,100		$	—
Amortization during the year	$	2,421		$	112
Other intangibles
Gross carrying amount	$	44,931		$	34,572
Accumulated amortization	(20,262		)	(18,992		)
Net book value	$	24,668		$	15,580
Additions during the period	$	10,359		$	2,162
Amortization during the year	$	1,270		$	1,847

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 evaluates its mortgage servicing rights asset for impairment at minimum on a quarterly basis. 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	59,168		$	62,085
Additions from acquisition	8,136			—
Additions	4,502			7,167
Amortization	(4,649		)	(10,084		)
Mortgage servicing rights at end of period	$	67,157		$	59,168
Valuation allowance at beginning of period	(784		)	(609		)
(Additions) recoveries, net	607			(175		)
Valuation allowance at end of period	(177		)	(784		)
Mortgage servicing rights, net	$	66,980		$	58,384
Fair value of mortgage servicing rights	$	84,585		$	64,387
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	8,500,578		$	7,646,846
Mortgage servicing rights, net to servicing portfolio	0.79		%	0.76		%
Mortgage servicing rights expense (a)	$	4,042		$	10,259

(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, 2018. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Six Months Ending December 31, 2018	$	2,905	$	1,563	$	4,725
2019	5,810		2,828		9,150
2020	5,810		2,711		7,963
2021	5,810		2,687		6,906
2022	5,810		2,663		6,000
2023	5,810		2,644		5,228
Beyond 2023	23,724		9,571		27,185
Total Estimated Amortization Expense	$	55,679	$	24,668	$	67,157

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Short and Long-Term Funding

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Short and Long-Term Funding

Short and Long-Term Funding

The following table presents the components of short-term funding (funding with original contractual maturities of one year or less), long-term funding (funding with original contractual maturities greater than one year), and FHLB advances (funding based on original contractual maturities).

	June 30, 2018			December 31, 2017
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	20,720		$	141,950
Securities sold under agreements to repurchase	183,013			182,865
Federal funds purchased and securities sold under agreements to repurchase	203,733			324,815
Commercial paper	52,791			67,467
Total short-term funding	$	256,525		$	392,282
Long-Term Funding
Senior notes, at par	$	250,000		$	250,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs	(2,381		)	(2,718		)
Total long-term funding	497,619			497,282
Total short and long-term funding, excluding FHLB advances	$	754,144		$	889,564
FHLB Advances
Short-term FHLB advances	$	370,000		$	284,000
Long-term FHLB advances	4,427,857			2,900,168
Total FHLB advances	$	4,797,857		$	3,184,168
Total short and long-term funding	$	5,552,001		$	4,073,732

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, 2018, the Corporation pledged agency mortgage-related securities with a fair value of $279 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, 2018 and December 31, 2017 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, 2018					($ in Thousands)
Repurchase agreements
Agency mortgage-related securities	$	183,013	$	—	$	—	$	—	$	183,013
Total	$	183,013	$	—	$	—	$	—	$	183,013
December 31, 2017
Repurchase agreements
Agency mortgage-related securities	$	182,865	$	—	$	—	$	—	$	182,865
Total	$	182,865	$	—	$	—	$	—	$	182,865

Long-Term Funding

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.

FHLB Advances

At June 30, 2018, the Corporation had $4.8 billion of FHLB advances, up $1.6 billion from December 31, 2017. The increase in FHLB borrowing is primarily a result of reduced reliance on network transaction deposits over the year.

At June 30, 2018, FHLB advances had maturity or put dates (callable by the FHLB) primarily ranging from 2018 through 2020, and had a weighted average interest rate of 1.97%, compared to 1.26% at December 31, 2017. A portion of the FHLB advances are indexed to the FHLB discount note and re-price at varying intervals. The advances offer flexible, market rate, long-term funding that improves the Corporation’s liquidity profile.

As of June 30, 2018, the Corporation had $2.6 billion of putable FHLB advances with a one-time option where the FHLB can call the advance prior to the contractual maturity. The contractual weighted average life to the put date of these advances was 1.4 years with a weighted average life to contractual maturity of 6.6 years . As of June 30, 2018, it is anticipated that all of these advances will be called by the FHLB on their put date.

The original contractual maturity or next put date of the Corporation's FHLB advances as of June 30, 2018 and December 31, 2017 are presented in the following table.

	June 30, 2018				December 31, 2017
	Amount		Weighted Average Contractual Coupon Rate		Amount		Weighted Average Contractual Coupon Rate
	($ in Thousands)
Maturity or put date within 1 year	$	2,632,613	1.70	%	$	2,434,000	1.26	%
After 1 but within 2	1,861,040		2.25	%	750,013		1.23	%
After 2 but within 3	291,606		2.60	%	155		4.91	%
After 3 years	12,598		4.55	%	—		—	%
FHLB advances and overall rate	$	4,797,857	1.97	%	$	3,184,168	1.26	%

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Derivative and Hedging Activities

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative and Hedging Activities

Derivative and Hedging Activities

The Corporation is exposed to certain risk arising from both its business operations and economic conditions. The Corporation principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Corporation enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Corporation's derivative financial instruments are used to manage differences in the amount, timing, and duration of the Corporation's known or expected cash receipts and its known or expected cash payments principally related to the Corporation's assets.

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 pledged $35 million of investment securities as collateral at June 30, 2018, and pledged $24 million of investment securities as collateral at December 31, 2017. 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, 2018 the Corporation posted $48 million of cash collateral for the margin compared to $22 million at December 31, 2017.

Fair Value Hedges of Interest Rate Risk

The Corporation is exposed to changes in the fair value of certain of its pools of prepayable fixed-rate assets due to changes in benchmark interest rates. The Corporation uses interest rate swaps to manage its exposure to changes in fair value on these

instruments attributable to changes in the designated benchmark interest rate. Interest rate swaps designated as fair value hedges involve the payment of fixed-rate amounts to a counterparty in exchange for the Corporation receiving variable-rate payments over the life of the agreements without the exchange of the underlying notional amount.

For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in interest income.

Derivatives to Accommodate Customer Needs

The Corporation also facilitates customer borrowing activity by entering 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 markets, 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. The Corporation's 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.

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.

	June 30, 2018						December 31, 2017
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Notional Amount		Fair Value			Balance Sheet Category
Derivatives not designated as hedging instruments
Interest rate-related instruments — customer and mirror	$	2,668,542	$	62,708		Trading assets	$	2,183,687	$	28,494		Trading assets
Interest rate-related instruments — customer and mirror	2,668,542		(62,141		)	Trading liabilities	2,183,687		(28,035		)	Trading liabilities
Foreign currency exchange forwards	143,551		3,317			Trading assets	124,851		2,495			Trading assets
Foreign currency exchange forwards	136,177		(3,091		)	Trading liabilities	118,094		(2,339		)	Trading liabilities
Commodity contracts	419,459		66,894			Trading assets	457,868		38,686			Trading assets
Commodity contracts	419,458		(66,380		)	Trading liabilities	457,108		(37,286		)	Trading liabilities
Interest rate lock commitments (mortgage)	335,070		3,287			Other assets	222,736		1,538			Other assets
Forward commitments (mortgage)	312,003		(919		)	Other liabilities	164,567		(313		)	Other liabilities
Purchased options (time deposit)	25,511		1,027			Other assets	31,063		1,175			Other assets
Written options (time deposit)	25,511		(1,027		)	Other liabilities	31,063		(1,175		)	Other liabilities
Derivatives designated as hedging instruments
Interest Rate Products	500,000		2,396			Other assets	—		—			Other assets

The following table presents amounts that were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges.

	Line Item in the Statement of Financial Position in Which the Hedged Item is Included
	Carrying Amount of the Hedged Assets/(Liabilities)		Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)
($ in Thousands)	June 30, 2018
Loans and investment securities receivables (a)	497,591		(2,409		)
Total	$	497,591	$	(2,409	)

(a) These amounts include the amortized cost basis of closed portfolios used to designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At June 30, 2018, the amortized cost basis of the closed portfolios used in these hedging relationships was $1.2 billion; the negative cumulative basis adjustments associated with these hedging relationships was $2.4 million; and the amounts of the designated hedged items were $500 million.

The table below identifies the effect of fair value hedge accounting on the Corporation's statement of performance during the six months ended June 30, 2018.

	Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships
	Six Months Ended June 30, 2018			Year Ended December 31, 2017
($ in Thousands)	Interest Income		Other Income (Expense)	Interest Income	Other Income (Expense)
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded	(13	)	—	—	—
The effects of fair value and cash flow hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20
Interest contracts
Hedged items	(2,409	)	—	—	—
Derivatives designated as hedging instruments	2,396		—	—	—

The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's statement of performance during the six months ended June 30, 2018.

	Income Statement Category of Gain / (Loss) Recognized in Income	For the Six Months Ended June 30,
($ in Thousands)		2018			2017
Derivative Instruments
Interest rate-related instruments — customer and mirror, net	Capital markets, net	$	108		$	(69	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,749			2,474
Forward commitments (mortgage)	Mortgage banking, net	(606		)	(2,749		)
Foreign currency exchange forwards	Capital markets, net	70			9
Commodity contracts	Capital markets, net	(886		)	198

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Balance Sheet Offsetting

6 Months Ended

Jun. 30, 2018

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 the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.

	Gross amounts of recognized assets						Gross amounts not offset in the balance sheet
($ in Thousands)			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Derivative liability available for offset			Collateral received			Net amount
Derivative assets: (a)
June 30, 2018	$	68,065	$	—	$	68,065	$	(27,040	)	$	(38,601	)	$	2,424
December 31, 2017	29,503		—		29,503		(16,140		)	(13,234		)	129
	Gross amounts of recognized liabilities						Gross amounts not offset in the balance sheet
($ in Thousands)			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Derivative asset available for offset			Collateral pledged			Net amount
Derivative liabilities (b)
June 30, 2018	$	63,363	$	—	$	63,363	$	(27,040	)	$	(35,513	)	$	810
December 31, 2017	37,164		—		37,164		(16,140		)	(20,662		)	362
(a) Includes interest and commodity instrument assets. (b) Includes interest and commodity instrument liabilities.

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

6 Months Ended

Jun. 30, 2018

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, 2018		December 31, 2017
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	8,552,601	$	8,027,187
Commercial letters of credit(a)	13,167		11,886
Standby letters of credit(c)	255,858		235,361

(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, 2018 or December 31, 2017.

(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.

(c) The Corporation has established a liability of $3 million at June 30, 2018 and $2 million at December 31, 2017, 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 $26 million at June 30, 2018 and $24 million at December 31, 2017, 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 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, 2018 was $137 million, compared to $147 million at December 31, 2017.

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 principal investment 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 loan pools that support CRA loans. The timing of future cash requirements to fund these pools is dependent upon loan demand, which can vary over time. The aggregate carrying value of these investments at June 30, 2018 was $25 million, compared to $23 million at December 31, 2017, included in other assets on the consolidated balance sheets.

Related to these investments, the Corporation had remaining commitments to fund $99 million at June 30, 2018, and $119 million at December 31, 2017.

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. On January 23, 2018, the District Court approved a settlement agreement between the parties.  Based on the terms of the settlement agreement, the Bank expects that the litigation will not have a material adverse impact on the Bank regardless of the outcome of the appeal to the Eighth Circuit Court of Appeals. 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.

Subsequent to the announcement on July 20, 2017, of the Merger Agreement between the Corporation and Bank Mutual, several lawsuits were filed in connection with the proposed merger. On July 28, 2017, two substantially identical purported class action complaints, each by various individual plaintiffs, were filed with the Wisconsin Circuit Court for Milwaukee County on behalf of the respective named plaintiffs and other Bank Mutual shareholders against Bank Mutual, the members of the Bank Mutual board, and the Corporation. The lawsuits are captioned Schumel et al v. Bank Mutual Corporation et al. and Paquin et al. v. Bank Mutual Corporation et al. Both complaints allege state law breach of fiduciary duty claims against the Bank Mutual board for, among other things, seeking to sell Bank Mutual through an allegedly defective process, for an allegedly unfair price and on allegedly unfair terms. On August 30, 2017, a third purported class action complaint, captioned Wollenburg et al. v. Bank Mutual Corporation et al., was filed in the Wisconsin Circuit Court for Milwaukee County, on behalf of the same class of shareholders and against the same defendants as the prior two complaints. The Wollenburg complaint asserts similar allegations as the prior two complaints, and further alleges that the preliminary proxy statement/prospectus filed with the SEC contains various alleged misstatements or omissions under federal securities law. The Paquin, Schumel and Wollenburg complaints allege that the Corporation aided and abetted Bank Mutual's directors' alleged breaches of fiduciary duty. The parties have entered into a stipulation seeking to consolidate the three actions. On September 13, 2017, the Corporation filed a notice of removal of the Paquin, Schumel and Wollenburg actions to the United States District Court for the Eastern District of Wisconsin. On September 15, 2017, the plaintiffs in the Paquin, Schumel and Wollenburg actions filed identical motions to remand the three cases back to state court, and on September 27, 2017, the defendants filed oppositions to the motions to remand. On October 3, 2017, the defendants filed motions to dismiss the three actions. On September 6, 2017, a fourth purported class action complaint, captioned Parshall et al., v. Bank Mutual Corporation et al., was filed in the U.S. District Court for the Eastern District of Wisconsin, on behalf of the same class of shareholders and against the same defendants as the prior complaints. The Parshall complaint criticizes the adequacy of the merger consideration and alleges that Bank Mutual, the members of the Bank Mutual board and the Corporation allegedly omitted and/or misrepresented certain information in the registration statement on Form S-4 filed in connection with the proposed merger in violation of the federal securities laws. The lawsuits seek, among other things, to enjoin the consummation of the transaction and damages. The

Corporation believes the allegations are without merit. On October 13, 2017, Bank Mutual and the Corporation reached agreement with the plaintiffs in each of the four cases whereby Bank Mutual issued certain additional disclosures in a Form 8-K, and each of the plaintiffs have agreed to dismiss their actions with prejudice as to the named plaintiffs and without prejudice as to the rest of the purported class members.

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 3 years 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.

A variety of consumer products, including mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters.

Mortgage Repurchase Reserve

The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under the Corporation's 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 $1 million during both the six months ended June 30, 2018 and the year ended December 31, 2017. The loss reimbursement and settlement claims paid for the six months ended June 30, 2018 were zero and negligible for the year ended December 31, 2017. Make whole requests during 2017 and the first six months of 2018 generally arose from loans sold during the period of January 1, 2012 to December 31, 2017. Since January 1, 2012, loans sold totaled $10.5 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of June 30, 2018, approximately $6.2 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Balance at beginning of period	$	987		$	900
Repurchase provision expense	150			246
Charge offs, net	(90		)	(159		)
Amount recorded at acquisition	88			—
Balance at end of period	$	1,135		$	987

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, 2018, and December 31, 2017, there were approximately $39 million and $44 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, 2018 and December 31, 2017, there were $64 million and $73 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, 2018

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 carried at estimated fair value. Management has 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 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 utilizes interest rate swaps to hedge exposure to interest rate risk and variability of fair value related to changes in the underlying interest rate of the hedged item. These hedged interest rate swaps are classified as fair value hedges. See Note 10 for additional disclosure regarding the Corporation’s fair value hedges.

In addition, the Corporation offers interest rate-related instruments (swaps and caps) to service its 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 measurement reflects the contractual terms of the derivative financial instruments, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. More specifically, the fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) with the variable cash payments (or receipts) based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. Likewise, the fair values of interest rate options (i.e., interest rate caps) are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (or rise above) the strike rate of the floors (or caps), with the variable interest rates used in the calculation of projected receipts on the floor (or cap) based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

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, 2018, and December 31, 2017, 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 its 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 instruments, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s commodity contracts.

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.

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, 2018, and December 31, 2017, 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.

The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Hierarchy	June 30, 2018		December 31, 2017
		($ in Thousands)
Assets
Investment securities available for sale
U.S. Treasury securities	Level 1	$	996	$	996
Residential mortgage-related securities
FNMA / FHLMC	Level 2	396,709		464,768
GNMA	Level 2	2,210,189		1,913,350
Private-label	Level 2	1,031		1,059
GNMA commercial mortgage-related securities	Level 2	1,348,282		1,513,277
FFELP asset backed securities	Level 2	299,831		145,176
Other equity securities	Level 1	1,613		1,632
Other debt securities	Level 2	3,000		3,188
Total investment securities available for sale	Level 1	2,609		2,628
Total investment securities available for sale	Level 2	4,259,042		4,040,818
Residential loans held for sale	Level 2	143,022		85,544
Interest rate-related instruments	Level 2	62,708		28,494
Foreign currency exchange forwards	Level 2	3,317		2,495
Interest rate products (designated as hedging instruments)	Level 2	2,396		—
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	3,287		1,538
Commodity contracts	Level 2	66,894		38,686
Purchased options (time deposit)	Level 2	1,027		1,175
Liabilities
Interest rate-related instruments	Level 2	$	62,141	$	28,035
Foreign currency exchange forwards	Level 2	3,091		2,339
Forward commitments to sell residential mortgage loans	Level 3	919		313
Commodity contracts	Level 2	66,380		37,286
Written options (time deposit)	Level 2	1,027		1,175

The table below presents a rollforward of the balance sheet amounts for the six months ended June 30, 2018 and the year ended December 31, 2017, 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, 2016	$	200		$	3,114
Total net gains (losses) included in income
Mortgage derivative gain (loss)	—			(1,889		)
Transfer out of level 3 securities (a)	(200		)	—
Balance December 31, 2017	$	—		$	1,225
Total net gains (losses) included in income
Mortgage derivative gain (loss)	—			1,147
Balance June 30, 2018	$	—		$	2,372

(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 basis as of June 30, 2018, 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, 2018, the closing ratio was 85%.

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 is based on a discounted cash flow analysis, 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, 2018, 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. 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 assets 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, 2018
Assets
Impaired loans(a)	Level 3	$	52,972	Provision for credit losses(b)	$	(12,431	)
Other real estate owned(c)	Level 2	1,954		Foreclosure / OREO expense, net	(808		)
Mortgage servicing rights	Level 3	84,585		Mortgage banking, net	607
December 31, 2017
Assets
Impaired loans(a)	Level 3	$	92,534	Provision for credit losses(b)	$	(32,159	)
Other real estate owned(c)	Level 2	2,604		Foreclosure / OREO expense, net	(939		)
Mortgage servicing rights	Level 3	64,387		Mortgage banking, net	(175		)

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

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

(c) If the fair value of the collateral exceeds the carrying amount of the asset, no charge-off or adjustment is necessary, the asset is not considered to be carried at fair value, and is therefore not included in the table.

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 Corporation'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, 2018
Mortgage servicing rights	Discounted cash flow	Discount rate	11%
Mortgage servicing rights	Discounted cash flow	Constant prepayment rate	9%
Impaired Loans	Appraisals / Discounted cash flow	Collateral / Discount factor	24%

Fair Value of Financial Instruments

The Corporation is required to disclose estimated fair values for its financial instruments.

Fair value estimates are set forth below for the Corporation’s financial instruments.

		June 30, 2018				December 31, 2017
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		($ in Thousands)
Financial assets
Cash and due from banks	Level 1	$	396,761	$	396,761	$	483,666	$	483,666
Interest-bearing deposits in other financial institutions	Level 1	71,462		71,462		199,702		199,702
Federal funds sold and securities purchased under agreements to resell	Level 1	3,150		3,150		32,650		32,650
Investment securities held to maturity	Level 2	2,602,247		2,560,943		2,282,853		2,283,574
Investment securities available for sale	Level 1	2,609		2,609		2,628		2,628
Investment securities available for sale	Level 2	4,259,042		4,259,042		4,040,818		4,040,818
FHLB and Federal Reserve Bank stocks	Level 2	249,040		249,040		165,331		165,331
Residential loans held for sale	Level 2	143,022		143,022		85,544		85,544
Loans, net	Level 3	22,724,184		22,282,282		20,519,111		20,314,984
Bank and corporate owned life insurance	Level 2	659,592		659,592		591,057		591,057
Derivatives (trading and other assets)	Level 2	136,342		136,342		70,850		70,850
Derivatives (trading and other assets)	Level 3	3,287		3,287		1,538		1,538
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	21,088,538	$	21,088,538	$	20,436,893	$	20,436,893
Brokered CDs and other time deposits	Level 2	2,727,776		2,727,776		2,349,069		2,349,069
Short-term funding	Level 2	626,525		626,525		676,282		676,282
Long-term funding	Level 2	4,925,476		4,921,348		3,397,450		3,411,368
Standby letters of credit(a)	Level 2	2,549		2,549		2,402		2,402
Derivatives (trading and other liabilities)	Level 2	132,639		132,639		68,835		68,835
Derivatives (trading and other liabilities)	Level 3	919		919		313		313

(a)

The commitment on standby letters of credit was $256 million and $235 million at June 30, 2018 and December 31, 2017, 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

6 Months Ended

Jun. 30, 2018

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 employees who meet participation requirements. 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.

Bank Mutual was acquired on February 1, 2018. The Bank Mutual Pension Plan has not yet been merged into the Corporation's Retirement Account Plan. However, Bank Mutual's Postretirement Plan was merged into the Corporation's Postretirement Plan during the first quarter of 2018.

The components of net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for three and six months ended June 30, 2018 and 2017 were as follows.

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in Thousands)
Components of Net Periodic Benefit Cost
RAP
Service cost	$	1,893		$	1,782		$	3,785		$	3,563
Interest cost	1,660			1,756			3,320			3,512
Expected return on plan assets	(4,755		)	(4,882		)	(9,510		)	(9,763		)
Amortization of prior service cost	(19		)	(18		)	(38		)	(37		)
Amortization of actuarial loss	463			487			925			975
Total net pension cost	$	(759	)	$	(875	)	$	(1,518	)	$	(1,750	)
Bank Mutual Pension Plan(a)
Interest cost	$	650		N/A			$	1,083		N/A
Expected return on plan assets	(1,060		)	N/A			(1,592		)	N/A
Total net pension cost	$	(410	)	N/A			$	(509	)	N/A
Postretirement Plan(b)
Interest cost	$	27		$	24		$	53		$	48
Amortization of prior service cost	(19		)	(19		)	(38		)	(38		)
Amortization of actuarial loss	2			—			4			—
Total net periodic benefit cost	$	10		$	5		$	19		$	10

(a)   The reported figures only include five months of expense due to the timing of the Bank Mutual acquisition. See Note 2 for additional information on the Bank Mutual acquisition.

(b) The portion of the Postretirement Plan attributed to Bank Mutual's Postretirement Plan only includes five months of expense due to the timing of the Bank Mutual acquisition. See Note 2 for additional information on the Bank Mutual acquisition.

The components of net periodic benefit cost, other than the service cost component, are included in the line item "other" of noninterest expense in the Consolidated Statements of Income.

The Corporation’s funding policy is to pay at least the minimum amount required by federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its pension plans. The Corporation made a $31 million contribution to the Bank Mutual Pension Plan during the second quarter of 2018.

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Segment Reporting

6 Months Ended

Jun. 30, 2018

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 2017 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 2017 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 2017 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). In addition, the Risk Management and Shared Services segment includes certain unallocated expenses related to Bank Mutual's shared services and operations prior to system conversion in late June 2018.

Information about the Corporation’s segments is presented below.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended June 30, 2018
Net interest income	$	107,330		$	114,620		$	4,413		$	226,362
Noninterest income	14,194			76,250			2,399			92,842
Total revenue	121,524			190,870			6,812			319,204
Credit provision(a)	11,126			4,880			(12,006		)	4,000
Noninterest expense	41,775			138,553			30,929			211,258
Income (loss) before income taxes	68,623			47,437			(12,111		)	103,947
Income tax expense (benefit)	13,454			9,962			(8,661		)	14,754
Net income (loss)	$	55,169		$	37,475		$	(3,450	)	$	89,192
Return on average allocated capital (ROCET1)(b)	17.9		%	22.7		%	(3.9		)%	14.0		%
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(a)	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)(b)	12.5		%	11.0		%	4.5		%	10.6		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended June 30, 2018
Average earning assets	$	12,066,538	$	10,402,680	$	7,943,487	$	30,412,705
Average loans	12,054,347		10,399,458		551,624		23,005,428
Average deposits	7,621,977		13,736,251		2,288,021		23,646,250
Average allocated capital (CET1)(b)	$	1,236,918	$	663,172	$	588,411	$	2,488,501
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)(b)	$	1,125,494	$	588,880	$	385,451	$	2,099,825

(a) The consolidated credit provision is equal to the actual reported provision for credit losses.

(b)

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, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) at June 30, 2018 and 2017 respectively, including changes during the preceding six and three month periods as well as any reclassifications out of accumulated other comprehensive income (loss).

($ in Thousands)	Investment Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2018	$	(38,453	)	$	(24,305	)	$	(62,758	)
Other comprehensive income (loss) before reclassifications	(60,754		)	—			(60,754		)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	2,015			—			2,015
Personnel expense	—			(76		)	(76		)
Other expense	—			929			929
Adjustment for adoption of ASU 2016-01	(84		)	—			(84		)
Adjustment for adoption of ASU 2018-02	(8,419		)	(5,235		)	(13,654		)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(632		)	—			(632		)
Income tax (expense) benefit	15,340			(216		)	15,124
Net other comprehensive income (loss) during period	(52,533		)	(4,597		)	(57,130		)
Balance June 30, 2018	$	(90,986	)	$	(28,902	)	$	(119,888	)
Balance January 1, 2017	$	(20,079	)	$	(34,600	)	$	(54,679	)
Other comprehensive income (loss) before reclassifications	3,632			—			3,632
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—			(75		)	(75		)
Other expense	—			975			975
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(2,575		)	—			(2,575		)
Income tax (expense) benefit	(406		)	(342		)	(748		)
Net other comprehensive income (loss) during period	651			558			1,209
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)

	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2018	$	(78,453	)	$	(29,220	)	$	(107,673	)
Other comprehensive income (loss) before reclassifications	(18,919		)	—			(18,919		)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	2,015			—			2,015
Personnel expense	—			(38		)	(38		)
Other expense	—			465			465
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(335		)	—			(335		)
Income tax (expense) benefit	4,705			(109		)	4,596
Net other comprehensive income (loss) during period	(12,533		)	318			(12,215		)
Balance June 30, 2018	$	(90,986	)	$	(28,902	)	$	(119,888	)
Balance April 1, 2017	$	(22,023	)	$	(34,321	)	$	(56,344	)
Other comprehensive income (loss) before reclassifications	5,744			—			5,744
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—			(37		)	(37		)
Other expense	—			487			487
Interest income (Amortization of net unrealized losses (gains)on available for sale securities transferred to held to maturity securities)	(1,548		)	—			(1,548		)
Income tax (expense) benefit	(1,601		)	(171		)	(1,772		)
Net other comprehensive income (loss) during period	2,595			279			2,874
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)

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Revenues

6 Months Ended

Jun. 30, 2018

Revenue Recognition [Abstract]

Revenues

Revenues

On January 1, 2018, the Corporation adopted Topic 606 using the modified retrospective method. As stated in Note 3, the implementation of the new standard had an immaterial impact to the Corporation. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606.

Revenue is recognized when obligations under the terms of a contract with the Corporation's customer are satisfied. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. We do not have any material significant payment terms as payment is received at or shortly after the satisfaction of the performance obligation.

The following table disaggregates the Corporation's revenue by major source for the three and six months ended June 30, 2018 and June 30, 2017.

Six Months Ended June 30, 2018
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	46,612	$	32	46,644
Service charges and deposit account fees	8,011			24,773		25		32,810
Card-based and loan fees(a)	674			19,691		67		20,432
Trust and asset management fees	—			26,806		—		26,806
Brokerage commissions and fees	—			13,902		267		14,169
Other revenue	(170		)	4,763		98		4,692
Noninterest Income (in-scope of Topic 606)	8,515			136,547		490		145,553
Noninterest Income (out-of-scope of Topic 606)	18,361			13,739		5,570		37,670
Total Noninterest Income	26,876			150,286		6,059		183,222
(a) Loan fees are out-of-scope of Topic 606.
Six Months Ended June 30, 2017
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	42,473	$	—	$	42,473
Service charges and deposit account fees	8,511			23,826		49		32,386
Card-based and loan fees(a)	592			16,973		11		17,575
Trust and asset management fees	—			24,281		—		24,281
Brokerage commissions and fees	—			8,679		—		8,679
Other revenue	82			4,315		105		4,502
Noninterest Income (in-scope of Topic 606)	9,184			120,547		165		129,896
Noninterest Income (out-of-scope of Topic 606)	15,306			10,132		6,906		32,344
Total Noninterest Income	24,490			130,679		7,072		162,241
(a) Loan fees are out-of-scope of Topic 606.

Three Months Ended June 30, 2018
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	23,988	$	7	$	23,996
Service charges and deposit account fees	3,786			12,590		13		16,390
Card-based and loan fees(a)	358			10,162		42		10,562
Trust and asset management fees	—			13,437		—		13,437
Brokerage commissions and fees	—			6,870		26		6,896
Other revenue	(825		)	2,302		68		1,545
Noninterest Income (in-scope of Topic 606)	3,320			69,349		156		72,825
Noninterest Income (out-of-scope of Topic 606)	10,874			6,901		2,242		20,017
Total Noninterest Income	14,194			76,250		2,399		92,842
(a) Loan fees are out-of-scope of Topic 606.
Three Months Ended June 30, 2017
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	20,853	$	—	$	20,853
Service charges and deposit account fees	4,070			11,938		23		16,030
Card-based and loan fees(a)	320			8,829		5		9,154
Trust and asset management fees	—			12,346		—		12,346
Brokerage commissions and fees	—			4,346		—		4,346
Other revenue	37			2,196		53		2,286
Noninterest Income (in-scope of Topic 606)	4,426			60,507		81		65,014
Noninterest Income (out-of-scope of Topic 606)	8,071			5,302		4,022		17,395
Total Noninterest Income	12,497			65,809		4,104		82,410
(a) Loan fees are out-of-scope of Topic 606.

During the first quarter of 2018, the Corporation acquired Bank Mutual. This acquisition resulted in increased service charges and deposit account fees and card-based and loan fees. In addition, the Corporation acquired Whitnell & Co., Diversified, and Anderson since the second quarter of 2017 which resulted in increased insurance commissions and fees, trust and asset management fees, and brokerage commissions.

Below is a listing of performance obligations for the Corporation's main revenue streams.

Revenue Stream	Noninterest income in-scope of Topic 606
Insurance commissions and fees	The Corporation's insurance revenue has two distinct performance obligations. The first performance obligation is the selling of the policy as an agent for the carrier. This performance obligation is satisfied upon binding of the policy. The second performance obligation is the ongoing servicing of the policy which is satisfied over the life of the policy. For employee benefits, the payment is typically received monthly. For property and casualty, payments can vary, but are typically received at, or in advance, of the policy period.
Service charges and deposit account fees	Service charges on deposit accounts consist of monthly service fees (i.e. business analysis fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts.
Card-based and loan fees(a)	Card-based and loan fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month.
Trust and asset management fees	Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered.
Brokerage commissions and fees	Brokerage commissions and fees primarily consists of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service.

(a) Loan fees are out-of-scope of Topic 606.

Arrangements with Multiple Performance Obligations

The Corporation's contracts with customers may include multiple performance obligations. For such arrangements, we allocate revenue to each performance obligation based on its relative standalone selling price. We generally determine standalone selling prices based on the expected cost plus margin.

Practical Expedients

We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

Using the practical expedient, for contracts with a term of one year or less, the Corporation recognizes incremental costs of obtaining those contracts as an expense when incurred.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition The Corporation recognizes revenue in accordance with ASC 606, "Revenue from Contracts with Customers." ASC 606 requires the Corporation to follow a five step process: (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. Revenue recognition under ASC 606 depicts 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 the goods or services.

Business combination

Business combinations

The Corporation accounts for its acquisitions using the purchase accounting method. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets that must be recognized. Typically, this allocation results in the purchase price exceeding the fair value of net assets acquired, which is recorded as goodwill. Core deposit intangibles are a measure of the value of checking, money market and savings deposits acquired in business combinations accounted for under the purchase method. Core deposit intangibles and other identified intangibles with finite useful lives are amortized using the straight line method over their estimated useful lives of up to ten years.

Loans that the Corporation acquires in connection with acquisitions are recorded at fair value with no carryover of the related allowance for credit losses. Fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. The excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized into interest income over the remaining life of the loan when there is a reasonable expectation about the amount and timing of such cash flows. If a reasonable expectation on the amount or timing of such cash flows can't be determined, accretion of the fair value discount for nonperforming loans will be recognized using the cost recovery method of accounting.

The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is referred to as the non-accretable discount. The non-accretable discount includes estimated future credit losses expected to be incurred over the life of the loan. Subsequent decreases to the expected cash flows will require the Corporation to evaluate the need for an additional allowance for credit losses. Subsequent improvement in expected cash flows will result in the reversal of a corresponding amount of the non-accretable discount which the Corporation will then reclassify as accretable discount that will be recognized into interest income over the remaining life of the loan.

The Corporation accounts for performing loans acquired in business combinations using the contractual cash flows method of recognizing discount accretion based on the acquired loans’ contractual cash flows. Purchased performing loans are recorded at fair value, including credit, interest, and liquidity discounts. The fair value discount is accreted as an adjustment to yield over the estimated lives of the loans. There is no allowance for loan losses established at the acquisition date for purchased performing loans. A provision for loan losses is recorded for any further deterioration in these loans subsequent to the acquisition.

New Accounting Pronouncements, Policy

New Accounting Pronouncements Adopted

Standard	Description	Date of adoption	Effect on financial statements
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The FASB issued an amendment to allow a reclassification from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption of the update is permitted and should be applied in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate related to the Tax Cut and Jobs Act of 2017 is recognized.	1st Quarter 2018	The Corporation has elected to early adopt this amendment. During the quarter, the Corporation reclassified approximately $14 million from accumulated other comprehensive income to retained earnings as a result of the Tax Cuts and Jobs Act. No material impact on results of operations, financial position, or liquidity. See Consolidated Statements of Comprehensive Income and the Statement of Changes in Stockholders' Equity.
ASU 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The FASB issued an amendment to better align a company’s financial reporting for hedging activities with the economic objectives of those activities for both financial (e.g., interest rate) and commodity risks. The provisions create more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. It also contains targeted improvements to simplify the application of hedge accounting guidance. This amendment is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Entities should apply the amendment on a modified retrospective transition method in which the cumulative effect of the change will be recognized within equity in the consolidated balance sheet as of the date of adoption. Early adoption is permitted, including in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes the interim period.	1st Quarter 2018	The Corporation has elected to early adopt this amendment. No material impact on results of operations, financial position, or liquidity. See Note 10 for expanded disclosures.
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 an amendment 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	No impact on results of operations, financial position, or liquidity. The Update required retrospective restatement. For the full year 2017, the Corporation reclassified approximately $9 million from personnel expense to other noninterest expense for the non-service cost components of net periodic pension cost and net periodic postretirement benefit cost. See Note 14 for expanded disclosure.
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 if: (1) 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) the asset group does not include a minimum of an input and a substantive process, it does not represent a business, and (3) 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, then 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	No material impact on results of operations, financial position, or 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	No impact on results of operations, financial position, or liquidity. See Consolidated Statements of Cash Flows.

Standard	Description	Date of adoption	Effect on financial statements
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 on results of operations, financial position, or 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 from 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 bank owned life insurance) should be classified as cash inflows from investing, while the cash payments for the premiums may be classified as cash outflows from 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	No material impact on results of operations, financial position, or 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 has adopted this amendment and is using the cumulative-effect adjustment as of the beginning of the fiscal year of adoption. No material impact on the result of operations, financial position or liquidity. In 2008, the Corporation received Visa Class B restricted shares as part of Visa’s initial public offering. Based on the existing transfer restriction and the uncertainty of the covered litigation, the approximately 119 thousand Class B shares remaining that the Corporation owned as of June 30, 2018 are carried at a zero cost basis. See Consolidated Statements of Comprehensive Income and Note 13 Fair Value Measurements.
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.	1st Quarter 2018	The Corporation chose to adopt this amendment using the modified retrospective approach with no material impact on the Corporation's results of operations, financial position, or liquidity. See Note 17 for expanded disclosure requirements.

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Acquisitions (Tables)

Feb. 01, 2018

Business Combinations [Abstract]

Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Bank Mutual.

	Purchase Accounting Adjustments			February 1, 2018
	($ in Thousands)
Assets
Cash and cash equivalents	$	—		$	78,052
Investment securities	(6,238		)	452,867
Federal Home Loan Bank stock, at cost	—			20,026
Loans	(48,043		)	1,875,877
Premises and equipment, net	5,180			44,939
Bank owned life insurance	(24		)	65,390
Goodwill				173,243
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet)	58,100			58,100
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet)	989			5,638
Others assets	$	6,153		$	46,257
Total assets				$	2,820,389
Liabilities
Deposits	$	2,498		$	1,840,950
Other borrowings	1,875			431,886
Other liabilities	$	4,370		$	65,864
Total liabilities				$	2,338,701
Total consideration paid				$	481,688

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Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2018

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,
	2018			2017			2018			2017
	(In Thousands, except per share data)
Net income	$	89,192		$	57,983		$	158,648		$	114,253
Preferred stock dividends	(2,329		)	(2,339		)	(4,668		)	(4,669		)
Net income available to common equity	$	86,863		$	55,644		$	153,980		$	109,584
Common shareholder dividends	(25,977		)	(18,326		)	(51,549		)	(36,577		)
Unvested share-based payment awards	(130		)	(110		)	(269		)	(227		)
Undistributed earnings	$	60,756		$	37,208		$	102,162		$	72,780
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Undistributed earnings allocated to unvested share-based payment awards	310			228			485			507
Undistributed earnings	$	60,756		$	37,208		$	102,162		$	72,780
Basic
Distributed earnings to common shareholders	$	25,977		$	18,326		$	51,549		$	36,577
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Total common shareholders earnings, basic	$	86,423		$	55,306		$	153,226		$	108,850
Diluted
Distributed earnings to common shareholders	$	25,977		$	18,326		$	51,549		$	36,577
Undistributed earnings allocated to common shareholders	60,446			36,980			101,677			72,273
Total common shareholders earnings, diluted	$	86,423		$	55,306		$	153,226		$	108,850
Weighted average common shares outstanding	170,633			151,573			167,096			151,196
Effect of dilutive common stock awards	2,146			1,958			2,080			2,155
Effect of dilutive common stock warrants	630			771			744			796
Diluted weighted average common shares outstanding	173,409			154,302			169,920			154,147
Basic earnings per common share	$	0.51		$	0.36		$	0.92		$	0.72
Diluted earnings per common share	$	0.50		$	0.36		$	0.90		$	0.71

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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 2018 and full year 2017.

	2018		2017
Dividend yield	2.50	%	2.00	%
Risk-free interest rate	2.60	%	2.00	%
Weighted average expected volatility	22.00	%	25.00	%
Weighted average expected life	5.75 years		5.5 years
Weighted average per share fair value of options	$4.47		$5.30

Summary of Company's Stock Option Activities

A summary of the Corporation’s stock option activity for the six months ended June 30, 2018 is presented below.

Stock Options	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value(a)
Outstanding at December 31, 2017	5,118,687		$	18.02	6.48	$	38,028
Granted	938,740		24.50
Assumed from Bank Mutual acquisition	370,051		14.35
Exercised	(888,661	)	16.69
Forfeited or expired	(38,613	)	24.21
Outstanding at June 30, 2018	5,500,204		$	19.05	6.69	$	45,418
Options Exercisable at June 30, 2018	3,287,488		$	16.80	5.39	$	34,551

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, 2018.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	2,026,071		$	19.68
Granted	573,877		24.65
Vested	(537,881	)	18.21
Forfeited	(30,480	)	22.16
Outstanding at June 30, 2018	2,031,587		$	21.87

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Gain (loss) on securities

The amortized cost and fair values of securities available for sale and held to maturity were as follows.

June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,001	$	—	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	396,368		5,573		(5,232		)	396,709
GNMA	2,275,481		23		(65,315		)	2,210,189
Private-label	1,037		—		(5		)	1,031
GNMA commercial mortgage-related securities	1,400,680		—		(52,399		)	1,348,282
FFELP asset backed securities	298,263		1,679		(111		)	299,831
Other debt securities	3,000		—		—			3,000
Other equity securities	1,613		—		—			1,613
Total investment securities available for sale	$	4,377,443	$	7,275	$	(123,068	)	$	4,261,651
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,593,147	$	4,851	$	(17,698	)	$	1,580,300
Residential mortgage-related securities
FNMA / FHLMC	97,822		191		(2,306		)	95,707
GNMA	388,174		1,969		(13,020		)	377,123
GNMA commercial mortgage-related securities	523,103		8,542		(23,832		)	507,813
Total investment securities held to maturity	$	2,602,247	$	15,553	$	(56,856	)	$	2,560,943

The proceeds from the sale of investment securities for the six months ended June 30, 2018 and 2017 are shown below.

	Six Months Ended June 30,
	2018			2017
	($ in Thousands)
Gross gains on available for sale securities	$	—		$	—
Gross gains on held to maturity securities	—			361
Total gains	—			361
Gross losses on available for sale securities	(2,015		)	—
Gross losses on held to maturity securities	$	—		$	(5	)
Total losses	$	(2,015	)	$	(5	)
Investment securities gains (losses), net	$	(2,015	)	$	356
Proceeds from sales of investment securities	$	493,060		$	16,059

Investment securities available for sale

A portion of the portfolio is also comprised of asset-backed securities backed by student loans made under the Federal Family Education Loan Program ("FFELP"). The amortized cost and fair values of securities available for sale and held to maturity were as follows.

June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,001	$	—	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	396,368		5,573		(5,232		)	396,709
GNMA	2,275,481		23		(65,315		)	2,210,189
Private-label	1,037		—		(5		)	1,031
GNMA commercial mortgage-related securities	1,400,680		—		(52,399		)	1,348,282
FFELP asset backed securities	298,263		1,679		(111		)	299,831
Other debt securities	3,000		—		—			3,000
Other equity securities	1,613		—		—			1,613
Total investment securities available for sale	$	4,377,443	$	7,275	$	(123,068	)	$	4,261,651
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,593,147	$	4,851	$	(17,698	)	$	1,580,300
Residential mortgage-related securities
FNMA / FHLMC	97,822		191		(2,306		)	95,707
GNMA	388,174		1,969		(13,020		)	377,123
GNMA commercial mortgage-related securities	523,103		8,542		(23,832		)	507,813
Total investment securities held to maturity	$	2,602,247	$	15,553	$	(56,856	)	$	2,560,943

December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,003	$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	457,680		9,722		(2,634		)	464,768
GNMA	1,944,453		275		(31,378		)	1,913,350
Private-label	1,067		—		(8		)	1,059
GNMA commercial mortgage-related securities	1,547,173		5		(33,901		)	1,513,277
FFELP asset backed securities	144,322		867		(13		)	145,176
Other debt securities	3,200		—		(12		)	3,188
Other equity securities	1,519		127		(14		)	1,632
Total investment securities available for sale	$	4,100,417	$	10,996	$	(67,967	)	$	4,043,446
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,281,320	$	13,899	$	(3,177	)	$	1,292,042
Residential mortgage-related securities
FNMA / FHLMC	40,995		398		(489		)	40,904
GNMA	414,440		2,700		(6,400		)	410,740
GNMA commercial mortgage-related securities	546,098		9,546		(15,756		)	539,888
Total investment securities held to maturity	$	2,282,853	$	26,543	$	(25,822	)	$	2,283,574

Investment securities held to maturity

A portion of the portfolio is also comprised of asset-backed securities backed by student loans made under the Federal Family Education Loan Program ("FFELP"). The amortized cost and fair values of securities available for sale and held to maturity were as follows.

June 30, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,001	$	—	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	396,368		5,573		(5,232		)	396,709
GNMA	2,275,481		23		(65,315		)	2,210,189
Private-label	1,037		—		(5		)	1,031
GNMA commercial mortgage-related securities	1,400,680		—		(52,399		)	1,348,282
FFELP asset backed securities	298,263		1,679		(111		)	299,831
Other debt securities	3,000		—		—			3,000
Other equity securities	1,613		—		—			1,613
Total investment securities available for sale	$	4,377,443	$	7,275	$	(123,068	)	$	4,261,651
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,593,147	$	4,851	$	(17,698	)	$	1,580,300
Residential mortgage-related securities
FNMA / FHLMC	97,822		191		(2,306		)	95,707
GNMA	388,174		1,969		(13,020		)	377,123
GNMA commercial mortgage-related securities	523,103		8,542		(23,832		)	507,813
Total investment securities held to maturity	$	2,602,247	$	15,553	$	(56,856	)	$	2,560,943

December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U. S. Treasury securities	$	1,003	$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	457,680		9,722		(2,634		)	464,768
GNMA	1,944,453		275		(31,378		)	1,913,350
Private-label	1,067		—		(8		)	1,059
GNMA commercial mortgage-related securities	1,547,173		5		(33,901		)	1,513,277
FFELP asset backed securities	144,322		867		(13		)	145,176
Other debt securities	3,200		—		(12		)	3,188
Other equity securities	1,519		127		(14		)	1,632
Total investment securities available for sale	$	4,100,417	$	10,996	$	(67,967	)	$	4,043,446
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	$	1,281,320	$	13,899	$	(3,177	)	$	1,292,042
Residential mortgage-related securities
FNMA / FHLMC	40,995		398		(489		)	40,904
GNMA	414,440		2,700		(6,400		)	410,740
GNMA commercial mortgage-related securities	546,098		9,546		(15,756		)	539,888
Total investment securities held to maturity	$	2,282,853	$	26,543	$	(25,822	)	$	2,283,574

Amortized cost and fair values of investment securities by contractual maturity

The expected maturities of investment securities available for sale and held to maturity at June 30, 2018 are shown below. Expected maturities may 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	$	3,001	$	2,996		$	46,938	$	47,269
Due after one year through five years	1,000		1,000			200,725		199,266
Due after five years through ten years	—		—			366,997		361,260
Due after ten years	—		—			978,487		972,504
Total debt securities	4,001		3,996			1,593,147		1,580,300
Residential mortgage-related securities
FNMA / FHLMC	396,368		396,709			97,822		95,707
GNMA	2,275,481		2,210,189			388,174		377,123
Private-label	1,037		1,031			—		—
GNMA commercial mortgage-related securities	1,400,680		1,348,282			523,103		507,813
FFELP asset backed securities	298,263		299,831			—		—
Equity securities	1,613		1,613			—		—
Total investment securities	$	4,377,443	$	4,261,651		$	2,602,247	$	2,560,943
Ratio of Fair Value to Amortized Cost			97.4		%			98.4		%

Realized gains and losses and proceeds from sale

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, 2018.

	Less than 12 months						12 months or more						Total
June 30, 2018	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	$	(6	)	$	996	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	19	(1,613		)	100,946		9	(3,620		)	128,509		(5,233		)	229,455
GNMA	62	(31,430		)	1,453,394		29	(33,885		)	756,061		(65,315		)	2,209,455
Private-label	—	—			—		1	(5		)	1,031		(5		)	1,031
GNMA commercial mortgage-related securities	22	(8,821		)	284,733		80	(43,577		)	1,063,701		(52,398		)	1,348,434
FFELP asset backed securities	7	(111		)	100,757		—	—			—		(111		)	100,757
Total	110	$	(41,975	)	$	1,939,830	120	$	(81,093	)	$	1,950,298	$	(123,068	)	$	3,890,128
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	890	$	(10,814	)	$	609,381	142	$	(6,884	)	$	128,244	$	(17,698	)	$	737,625
Residential mortgage-related securities
FNMA / FHLMC	25	(1,518		)	76,046		10	(788		)	14,728		(2,306		)	90,774
GNMA	61	(7,062		)	236,008		20	(5,957		)	137,093		(13,019		)	373,101
GNMA commercial mortgage-related securities	1	(813		)	29,243		24	(23,019		)	478,570		(23,832		)	507,813
Total	977	$	(20,207	)	$	950,678	196	$	(36,648	)	$	758,635	$	(56,856	)	$	1,709,313

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, 2018.

	Less than 12 months						12 months or more						Total
June 30, 2018	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	$	(6	)	$	996	$	(6	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	19	(1,613		)	100,946		9	(3,620		)	128,509		(5,233		)	229,455
GNMA	62	(31,430		)	1,453,394		29	(33,885		)	756,061		(65,315		)	2,209,455
Private-label	—	—			—		1	(5		)	1,031		(5		)	1,031
GNMA commercial mortgage-related securities	22	(8,821		)	284,733		80	(43,577		)	1,063,701		(52,398		)	1,348,434
FFELP asset backed securities	7	(111		)	100,757		—	—			—		(111		)	100,757
Total	110	$	(41,975	)	$	1,939,830	120	$	(81,093	)	$	1,950,298	$	(123,068	)	$	3,890,128
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	890	$	(10,814	)	$	609,381	142	$	(6,884	)	$	128,244	$	(17,698	)	$	737,625
Residential mortgage-related securities
FNMA / FHLMC	25	(1,518		)	76,046		10	(788		)	14,728		(2,306		)	90,774
GNMA	61	(7,062		)	236,008		20	(5,957		)	137,093		(13,019		)	373,101
GNMA commercial mortgage-related securities	1	(813		)	29,243		24	(23,019		)	478,570		(23,832		)	507,813
Total	977	$	(20,207	)	$	950,678	196	$	(36,648	)	$	758,635	$	(56,856	)	$	1,709,313

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, 2017.

	Less than 12 months						12 months or more						Total
December 31, 2017	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale
U.S. Treasury securities	1	$	(7	)	$	996	—	$	—		$	—	$	(7	)	$	996
Residential mortgage-related securities
FNMA / FHLMC	9	(572		)	69,939		9	(2,062		)	142,093		(2,634		)	212,032
GNMA	44	(8,927		)	1,028,221		25	(22,451		)	737,198		(31,378		)	1,765,419
Private-label	—	—			—		1	(8		)	1,059		(8		)	1,059
GNMA commercial mortgage-related securities	33	(5,554		)	480,514		70	(28,347		)	1,026,642		(33,901		)	1,507,156
FFELP asset backed securities	1	(13		)	12,158		—	—			—		(13		)	12,158
Other debt securities	1	(12		)	188		—	—			—		(12		)	188
Other equity securities	3	(14		)	1,487		—	—			—		(14		)	1,487
Total	92	$	(15,099	)	$	1,593,503	105	$	(52,868	)	$	1,906,992	$	(67,967	)	$	3,500,495
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)	157	$	(746	)	$	122,761	132	$	(2,431	)	$	127,043	$	(3,177	)	$	249,804
Residential mortgage-related securities
FNMA / FHLMC	8	(73		)	13,143		10	(417		)	16,262		(490		)	29,405
GNMA	35	(3,373		)	268,388		18	(3,026		)	120,892		(6,399		)	389,280
GNMA commercial mortgage-related securities	2	(299		)	52,997		23	(15,457		)	486,891		(15,756		)	539,888
Total	202	$	(4,491	)	$	457,289	183	$	(21,331	)	$	751,088	$	(25,822	)	$	1,208,377

XML

Loans (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Loan composition

The period end loan composition was as follows.

	June 30, 2018(a)		December 31, 2017
	($ in Thousands)
Commercial and industrial	$	7,109,796	$	6,399,693
Commercial real estate — owner occupied	888,330		802,209
Commercial and business lending	7,998,126		7,201,902
Commercial real estate — investor	3,996,415		3,315,254
Real estate construction	1,487,159		1,451,684
Commercial real estate lending	5,483,574		4,766,938
Total commercial	13,481,700		11,968,840
Residential mortgage	8,207,253		7,546,534
Home equity	911,363		883,804
Other consumer	376,470		385,813
Total consumer	9,495,086		8,816,151
Total loans	$	22,976,786	$	20,784,991

Commercial and consumer loans by credit quality indicator

The following table presents commercial and consumer loans by credit quality indicator at June 30, 2018.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,763,557	$	92,286	$	172,177	$	81,776	$	7,109,796
Commercial real estate - owner occupied	814,769		16,033		38,879		18,649		888,330
Commercial and business lending	7,578,326		108,319		211,056		100,425		7,998,126
Commercial real estate - investor	3,885,535		59,587		24,790		26,503		3,996,415
Real estate construction	1,452,888		29,559		3,168		1,544		1,487,159
Commercial real estate lending	5,338,423		89,146		27,958		28,047		5,483,574
Total commercial	12,916,749		197,465		239,014		128,472		13,481,700
Residential mortgage	8,141,803		199		2,355		62,896		8,207,253
Home equity	897,471		792		142		12,958		911,363
Other consumer	375,624		706		6		134		376,470
Total consumer	9,414,898		1,697		2,503		75,988		9,495,086
Total	$	22,331,647	$	199,162	$	241,517	$	204,460	$	22,976,786

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2017.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	6,015,884	$	157,245	$	113,778	$	112,786	$	6,399,693
Commercial real estate - owner occupied	723,291		14,181		41,997		22,740		802,209
Commercial and business lending	6,739,175		171,426		155,775		135,526		7,201,902
Commercial real estate - investor	3,266,389		24,845		19,291		4,729		3,315,254
Real estate construction	1,421,504		29,206		—		974		1,451,684
Commercial real estate lending	4,687,893		54,051		19,291		5,703		4,766,938
Total commercial	11,427,068		225,477		175,066		141,229		11,968,840
Residential mortgage	7,490,860		426		1,616		53,632		7,546,534
Home equity	868,958		1,137		195		13,514		883,804
Other consumer	384,990		652		—		171		385,813
Total consumer	8,744,808		2,215		1,811		67,317		8,816,151
Total	$	20,171,876	$	227,692	$	176,877	$	208,546	$	20,784,991

Summarized details of Loans

The following table presents loans by past due status at June 30, 2018.

	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	$	7,027,210	$	407	$	181	$	222	$	81,776	$	7,109,796
Commercial real estate - owner occupied	869,488		193		—		—		18,649		888,330
Commercial and business lending	7,896,698		600		181		222		100,425		7,998,126
Commercial real estate - investor	3,969,084		828		—		—		26,503		3,996,415
Real estate construction	1,465,850		19,765		—		—		1,544		1,487,159
Commercial real estate lending	5,434,934		20,593		—		—		28,047		5,483,574
Total commercial	13,331,632		21,193		181		222		128,472		13,481,700
Residential mortgage	8,135,016		9,158		183		—		62,896		8,207,253
Home equity	891,135		6,534		736		—		12,958		911,363
Other consumer	372,984		972		763		1,617		134		376,470
Total consumer	9,399,135		16,664		1,682		1,617		75,988		9,495,086
Total	$	22,730,767	$	37,857	$	1,863	$	1,839	$	204,460	$	22,976,786

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2018 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans, $141 million or 69% were current with respect to payment at June 30, 2018.

The following table presents loans by past due status at December 31, 2017.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due(a)		Nonaccrual(b)		Total
	($ in Thousands)
Commercial and industrial	$	6,286,369	$	170	$	101	$	267	$	112,786	$	6,399,693
Commercial real estate - owner occupied	779,421		48		—		—		22,740		802,209
Commercial and business lending	7,065,790		218		101		267		135,526		7,201,902
Commercial real estate - investor	3,310,000		374		—		151		4,729		3,315,254
Real estate construction	1,450,459		168		83		—		974		1,451,684
Commercial real estate lending	4,760,459		542		83		151		5,703		4,766,938
Total commercial	11,826,249		760		184		418		141,229		11,968,840
Residential mortgage	7,483,350		9,186		366		—		53,632		7,546,534
Home equity	863,465		5,688		1,137		—		13,514		883,804
Other consumer	382,186		1,227		780		1,449		171		385,813
Total consumer	8,729,001		16,101		2,283		1,449		67,317		8,816,151
Total	$	20,555,250	$	16,861	$	2,467	$	1,867	$	208,546	$	20,784,991

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2017 (the same as the reported balances for the accruing loans noted above).

(b)

Of the total nonaccrual loans, $135 million or 65% were current with respect to payment at December 31, 2017.

Summarized details of impaired Loans

The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $16 million of purchased credit-impaired loans, at June 30, 2018.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	75,928	$	77,873	$	17,628	$	70,082	$	725
Commercial real estate — owner occupied	15,386		15,853		829		15,649		95
Commercial and business lending	91,314		93,726		18,457		85,731		820
Commercial real estate — investor	15,397		15,469		4,132		15,485		901
Real estate construction	448		523		77		456		15
Commercial real estate lending	15,845		15,992		4,209		15,941		916
Total commercial	107,159		109,718		22,666		101,672		1,736
Residential mortgage	39,926		44,171		6,208		39,433		863
Home equity	9,817		10,809		3,514		9,917		282
Other consumer	1,049		1,051		109		1,051		1
Total consumer	50,792		56,031		9,831		50,401		1,146
Total loans(a)	$	157,951	$	165,749	$	32,497	$	152,073	$	2,882
Loans with no related allowance
Commercial and industrial	$	35,065	$	47,914	$	—	$	39,201	$	(286	)
Commercial real estate — owner occupied	4,869		5,920		—		4,179		24
Commercial and business lending	39,934		53,834		—		43,380		(262		)
Commercial real estate — investor	984		1,031		—		1,006		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	984		1,031		—		1,006		—
Total commercial	40,918		54,865		—		44,386		(262		)
Residential mortgage	11,543		11,862		—		7,839		128
Home equity	1,275		1,289		—		785		12
Other consumer	—		—		—		—		—
Total consumer	12,818		13,151		—		8,624		140
Total loans(a)	$	53,736	$	68,016	$	—	$	53,010	$	(122	)
Total
Commercial and industrial	$	110,993	$	125,787	$	17,628	$	109,283	$	439
Commercial real estate — owner occupied	20,255		21,773		829		19,828		119
Commercial and business lending	131,248		147,560		18,457		129,111		558
Commercial real estate — investor	16,381		16,500		4,132		16,491		901
Real estate construction	448		523		77		456		15
Commercial real estate lending	16,829		17,023		4,209		16,947		916
Total commercial	148,077		164,583		22,666		146,058		1,474
Residential mortgage	51,469		56,033		6,208		47,272		991
Home equity	11,092		12,098		3,514		10,702		294
Other consumer	1,049		1,051		109		1,051		1
Total consumer	63,610		69,182		9,831		59,025		1,286
Total loans(a)	$	211,687	$	233,765	$	32,497	$	205,083	$	2,760

(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, 2018.

The following table presents impaired loans individually evaluated under ASC Topic 310 at December 31, 2017. 

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	81,649	$	83,579	$	10,838	$	58,494	$	2,629
Commercial real estate — owner occupied	23,796		23,937		2,973		12,124		736
Commercial and business lending	105,445		107,516		13,811		70,618		3,365
Commercial real estate — investor	17,823		17,862		1,597		16,924		1,694
Real estate construction	467		578		86		484		29
Commercial real estate lending	18,290		18,440		1,683		17,408		1,723
Total commercial	123,735		125,956		15,494		88,026		5,088
Residential mortgage	40,561		42,922		6,512		40,411		1,614
Home equity	10,250		10,986		3,718		10,521		549
Other consumer	1,135		1,138		122		1,140		3
Total consumer	51,946		55,046		10,352		52,072		2,166
Total loans(a)	$	175,681	$	181,002	$	25,846	$	140,098	$	7,254
Loans with no related allowance
Commercial and industrial	$	60,595	$	82,839	$	—	$	89,275	$	492
Commercial real estate — owner occupied	2,438		2,829		—		1,948		36
Commercial and business lending	63,033		85,668		—		91,223		528
Commercial real estate — investor	1,295		1,295		—		—		45
Real estate construction	—		—		—		—		—
Commercial real estate lending	1,295		1,295		—		—		45
Total commercial	64,328		86,963		—		91,223		573
Residential mortgage	6,925		7,204		—		4,999		217
Home equity	641		645		—		540		7
Other consumer	—		—		—		—		—
Total consumer	7,566		7,849		—		5,539		224
Total loans(a)	$	71,894	$	94,812	$	—	$	96,762	$	797
Total
Commercial and industrial	$	142,244	$	166,418	$	10,838	$	147,769	$	3,121
Commercial real estate — owner occupied	26,234		26,766		2,973		14,072		772
Commercial and business lending	168,478		193,184		13,811		161,841		3,893
Commercial real estate — investor	19,118		19,157		1,597		16,924		1,739
Real estate construction	467		578		86		484		29
Commercial real estate lending	19,585		19,735		1,683		17,408		1,768
Total commercial	188,063		212,919		15,494		179,249		5,661
Residential mortgage	47,486		50,126		6,512		45,410		1,831
Home equity	10,891		11,631		3,718		11,061		556
Other consumer	1,135		1,138		122		1,140		3
Total consumer	59,512		62,895		10,352		57,611		2,390
Total loans(a)	$	247,575	$	275,814	$	25,846	$	236,860	$	8,051

(a)

The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 80% of the unpaid principal balance at December 31, 2017.

Nonaccrual and performing restructured loans

The following table presents nonaccrual and performing restructured loans by loan portfolio.

	June 30, 2018				December 31, 2017
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	32,438	$	155	$	30,047	$	1,776
Commercial real estate — owner occupied	3,820		—		3,989		—
Commercial real estate — investor	372		14,268		14,389		—
Real estate construction	222		226		310		157
Residential mortgage	17,934		20,372		17,068		18,991
Home equity	7,900		2,972		7,705		2,537
Other consumer	1,037		12		1,110		25
Total	$	63,723	$	38,005	$	74,618	$	23,486

(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, 2018 and 2017, respectively, and the recorded investment and unpaid principal balance as of June 30, 2018 and 2017, respectively.

	Six Months Ended June 30, 2018					Six Months Ended June 30, 2017
	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	1	$	47	$	47	24	$	30,935	$	52,260
Commercial real estate — owner occupied	—	—		—		2	716		716
Commercial real estate — investor	1	984		1,031		—	—		—
Residential mortgage	10	2,064		2,064		36	2,695		2,805
Home equity	10	935		949		26	674		919
Other consumer	1	5		8		—	—		—
Total	23	$	4,035	$	4,099	88	$	35,020	$	56,700

(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, 2018 and 2017, respectively, as well as the recorded investment in these restructured loans as of June 30, 2018 and 2017, respectively.

	Six Months Ended June 30, 2018			Six Months Ended June 30, 2017
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial and industrial	3	$	—	—	$	—
Residential mortgage	8	2,219		17	941
Home equity	21	1,409		9	271
Total	32	$	3,628	26	$	1,212

Changes in the allowance for loan losses by portfolio segment

($ in Millions)	Six Months Ended June 30, 2018			Year Ended December 31, 2017
Balance at beginning of period	$	27		$	38
Charge offs	(14		)	(25		)
Recoveries	3			—
Net Charge offs	(11		)	(25		)
Provision for loan losses	1			14
Balance at end of period	$	17		$	27
Allowance for loan losses
Individually evaluated for impairment	$	9		$	5
Collectively evaluated for impairment	8			22
Total allowance for loan losses	$	17		$	27
Loans
Individually evaluated for impairment	$	45		$	77
Collectively evaluated for impairment	637			523
Total loans	$	682		$	600

The following table presents a summary of the changes in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018.

($ 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, 2017	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Charge offs	(19,611		)	(1,042		)	(1,202		)	(53		)	(956		)	(1,729		)	(2,488		)	(27,081		)
Recoveries	6,406			287			21			290			690			1,192			416			9,302
Net Charge offs	(13,205		)	(755		)	(1,181		)	237			(266		)	(537		)	(2,072		)	(17,779		)
Provision for loan losses	750			1,213			4,272			(5,455		)	1,796			(301		)	2,225			4,500
June 30, 2018	$	110,613		$	10,810		$	44,150		$	29,152		$	31,137		$	21,288		$	5,451		$	252,601
Allowance for loan losses
Individually evaluated for impairment	$	17,628		$	829		$	4,132		$	77		$	6,208		$	3,514		$	109		$	32,497
Collectively evaluated for impairment	92,985			9,981			40,018			29,075			24,929			17,774			5,342			220,104
Acquired and accounted for under ASC 310-30(a)	—			—			—			—			—			—			—			—
Total allowance for loan losses	$	110,613		$	10,810		$	44,150		$	29,152		$	31,137		$	21,288		$	5,451		$	252,601
Loans
Individually evaluated for impairment	$	110,993		$	20,255		$	16,381		$	448		$	51,469		$	11,092		$	1,049		$	211,687
Collectively evaluated for impairment	6,996,038			866,356			3,969,829			1,486,464			8,154,904			900,187			375,421			22,749,199
Acquired and accounted for under ASC 310-30(a)	2,765			1,719			10,205			247			880			84			—			15,900
Total loans	$	7,109,796		$	888,330		$	3,996,415		$	1,487,159		$	8,207,253		$	911,363		$	376,470		$	22,976,786

(a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality."

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2017, was as follows.

($ in Thousands)	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate -  investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2016	$	140,126		$	14,034		$	45,285		$	26,932		$	27,046		$	20,364		$	4,548		$	278,335
Charge offs	(44,533		)	(344		)	(991		)	(604		)	(2,611		)	(2,724		)	(4,439		)	(56,246		)
Recoveries	11,465			173			242			74			927			3,194			716			16,791
Net Charge offs	(33,068		)	(171		)	(749		)	(530		)	(1,684		)	470			(3,723		)	(39,455		)
Provision for loan losses	16,010			(3,511		)	(3,477		)	7,968			4,245			1,292			4,473			27,000
December 31, 2017	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Allowance for loan losses
Individually evaluated for impairment	$	10,838		$	2,973		$	1,597		$	86		$	6,512		$	3,718		$	122		$	25,846
Collectively evaluated for impairment	112,230			7,379			39,462			34,284			23,095			18,408			5,176			240,034
Total allowance for loan losses	$	123,068		$	10,352		$	41,059		$	34,370		$	29,607		$	22,126		$	5,298		$	265,880
Loans
Individually evaluated for impairment	$	142,244		$	26,234		$	19,118		$	467		$	47,486		$	10,891		$	1,135		$	247,575
Collectively evaluated for impairment	6,257,449			775,975			3,296,136			1,451,217			7,499,048			872,913			384,678			20,537,416
Total loans	$	6,399,693		$	802,209		$	3,315,254		$	1,451,684		$	7,546,534		$	883,804		$	385,813		$	20,784,991

Changes in the allowance for unfunded commitments

The following table presents a summary of the changes in the allowance for unfunded commitments.

	Six Months Ended June 30, 2018			Year Ended December 31, 2017
	($ in Thousands)
Allowance for Unfunded Commitments
Balance at beginning of period	$	24,400		$	25,400
Provision for unfunded commitments	(500		)	(1,000		)
Amount recorded at acquisition	2,436			—
Balance at end of period	$	26,336		$	24,400

Changes In Accretable Yield For Purchased Credit Impaired

Changes in the accretable yield for loans acquired and accounted for under ASC Topic 310-30 were as follows for the six months ended June 30, 2018 and for the year ended December 31, 2017

	Six Months Ended June 30, 2018			Year Ended December 31, 2017
	($ in Thousands)
Changes in Accretable Yield
Balance at beginning of period	$	—		$	—
Purchases	4,881			—
Accretion	(119		)	—
Balance at end of period	$	4,762		$	—

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Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Core deposit intangibles
Gross carrying amount	$	58,100		$	4,385
Accumulated amortization	(2,421		)	(4,385		)
Net book value	$	55,679		$	—
Additions during the periods	$	58,100		$	—
Amortization during the year	$	2,421		$	112
Other intangibles
Gross carrying amount	$	44,931		$	34,572
Accumulated amortization	(20,262		)	(18,992		)
Net book value	$	24,668		$	15,580
Additions during the period	$	10,359		$	2,162
Amortization during the year	$	1,270		$	1,847

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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	59,168		$	62,085
Additions from acquisition	8,136			—
Additions	4,502			7,167
Amortization	(4,649		)	(10,084		)
Mortgage servicing rights at end of period	$	67,157		$	59,168
Valuation allowance at beginning of period	(784		)	(609		)
(Additions) recoveries, net	607			(175		)
Valuation allowance at end of period	(177		)	(784		)
Mortgage servicing rights, net	$	66,980		$	58,384
Fair value of mortgage servicing rights	$	84,585		$	64,387
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	8,500,578		$	7,646,846
Mortgage servicing rights, net to servicing portfolio	0.79		%	0.76		%
Mortgage servicing rights expense (a)	$	4,042		$	10,259

(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, 2018. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Six Months Ending December 31, 2018	$	2,905	$	1,563	$	4,725
2019	5,810		2,828		9,150
2020	5,810		2,711		7,963
2021	5,810		2,687		6,906
2022	5,810		2,663		6,000
2023	5,810		2,644		5,228
Beyond 2023	23,724		9,571		27,185
Total Estimated Amortization Expense	$	55,679	$	24,668	$	67,157

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Short and Long-Term Funding (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Breakdown of short & long-term debt balances

he components of short-term funding (funding with original contractual maturities of one year or less), long-term funding (funding with original contractual maturities greater than one year), and FHLB advances (funding based on original contractual maturities).

	June 30, 2018			December 31, 2017
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	20,720		$	141,950
Securities sold under agreements to repurchase	183,013			182,865
Federal funds purchased and securities sold under agreements to repurchase	203,733			324,815
Commercial paper	52,791			67,467
Total short-term funding	$	256,525		$	392,282
Long-Term Funding
Senior notes, at par	$	250,000		$	250,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs	(2,381		)	(2,718		)
Total long-term funding	497,619			497,282
Total short and long-term funding, excluding FHLB advances	$	754,144		$	889,564
FHLB Advances
Short-term FHLB advances	$	370,000		$	284,000
Long-term FHLB advances	4,427,857			2,900,168
Total FHLB advances	$	4,797,857		$	3,184,168
Total short and long-term funding	$	5,552,001		$	4,073,732

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, 2018 and December 31, 2017 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, 2018					($ in Thousands)
Repurchase agreements
Agency mortgage-related securities	$	183,013	$	—	$	—	$	—	$	183,013
Total	$	183,013	$	—	$	—	$	—	$	183,013
December 31, 2017
Repurchase agreements
Agency mortgage-related securities	$	182,865	$	—	$	—	$	—	$	182,865
Total	$	182,865	$	—	$	—	$	—	$	182,865

FHLB_Maturity_ [Table Text Block]

The original contractual maturity or next put date of the Corporation's FHLB advances as of June 30, 2018 and December 31, 2017 are presented in the following table.

	June 30, 2018				December 31, 2017
	Amount		Weighted Average Contractual Coupon Rate		Amount		Weighted Average Contractual Coupon Rate
	($ in Thousands)
Maturity or put date within 1 year	$	2,632,613	1.70	%	$	2,434,000	1.26	%
After 1 but within 2	1,861,040		2.25	%	750,013		1.23	%
After 2 but within 3	291,606		2.60	%	155		4.91	%
After 3 years	12,598		4.55	%	—		—	%
FHLB advances and overall rate	$	4,797,857	1.97	%	$	3,184,168	1.26	%

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Derivative and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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.

	June 30, 2018						December 31, 2017
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Notional Amount		Fair Value			Balance Sheet Category
Derivatives not designated as hedging instruments
Interest rate-related instruments — customer and mirror	$	2,668,542	$	62,708		Trading assets	$	2,183,687	$	28,494		Trading assets
Interest rate-related instruments — customer and mirror	2,668,542		(62,141		)	Trading liabilities	2,183,687		(28,035		)	Trading liabilities
Foreign currency exchange forwards	143,551		3,317			Trading assets	124,851		2,495			Trading assets
Foreign currency exchange forwards	136,177		(3,091		)	Trading liabilities	118,094		(2,339		)	Trading liabilities
Commodity contracts	419,459		66,894			Trading assets	457,868		38,686			Trading assets
Commodity contracts	419,458		(66,380		)	Trading liabilities	457,108		(37,286		)	Trading liabilities
Interest rate lock commitments (mortgage)	335,070		3,287			Other assets	222,736		1,538			Other assets
Forward commitments (mortgage)	312,003		(919		)	Other liabilities	164,567		(313		)	Other liabilities
Purchased options (time deposit)	25,511		1,027			Other assets	31,063		1,175			Other assets
Written options (time deposit)	25,511		(1,027		)	Other liabilities	31,063		(1,175		)	Other liabilities
Derivatives designated as hedging instruments
Interest Rate Products	500,000		2,396			Other assets	—		—			Other assets

Cumulative Basis Adjustment for Fair Value Hedges

The following table presents amounts that were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges.

	Line Item in the Statement of Financial Position in Which the Hedged Item is Included
	Carrying Amount of the Hedged Assets/(Liabilities)		Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)
($ in Thousands)	June 30, 2018
Loans and investment securities receivables (a)	497,591		(2,409		)
Total	$	497,591	$	(2,409	)

(a)

These amounts include the amortized cost basis of closed portfolios used to designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At June 30, 2018, the amortized cost basis of the closed portfolios used in these hedging relationships was $1.2 billion; the negative cumulative basis adjustments associated with these hedging relationships was $2.4 million; and the amounts of the designated hedged items were $500 million.

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

The table below identifies the effect of fair value hedge accounting on the Corporation's statement of performance during the six months ended June 30, 2018.

	Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships
	Six Months Ended June 30, 2018			Year Ended December 31, 2017
($ in Thousands)	Interest Income		Other Income (Expense)	Interest Income	Other Income (Expense)
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded	(13	)	—	—	—
The effects of fair value and cash flow hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20
Interest contracts
Hedged items	(2,409	)	—	—	—
Derivatives designated as hedging instruments	2,396		—	—	—

Gain (loss) on derivative instruments not designated as hedging instruments

The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's statement of performance during the six months ended June 30, 2018.

	Income Statement Category of Gain / (Loss) Recognized in Income	For the Six Months Ended June 30,
($ in Thousands)		2018			2017
Derivative Instruments
Interest rate-related instruments — customer and mirror, net	Capital markets, net	$	108		$	(69	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,749			2,474
Forward commitments (mortgage)	Mortgage banking, net	(606		)	(2,749		)
Foreign currency exchange forwards	Capital markets, net	70			9
Commodity contracts	Capital markets, net	(886		)	198

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Balance Sheet Offsetting (Tables)

6 Months Ended

Jun. 30, 2018

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 the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.

	Gross amounts of recognized assets						Gross amounts not offset in the balance sheet
($ in Thousands)			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Derivative liability available for offset			Collateral received			Net amount
Derivative assets: (a)
June 30, 2018	$	68,065	$	—	$	68,065	$	(27,040	)	$	(38,601	)	$	2,424
December 31, 2017	29,503		—		29,503		(16,140		)	(13,234		)	129
	Gross amounts of recognized liabilities						Gross amounts not offset in the balance sheet
($ in Thousands)			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Derivative asset available for offset			Collateral pledged			Net amount
Derivative liabilities (b)
June 30, 2018	$	63,363	$	—	$	63,363	$	(27,040	)	$	(35,513	)	$	810
December 31, 2017	37,164		—		37,164		(16,140		)	(20,662		)	362
(a) Includes interest and commodity instrument assets. (b) Includes interest and commodity instrument liabilities.

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

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of lending-related and other commitments

The following is a summary of lending-related commitments.

	June 30, 2018		December 31, 2017
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	8,552,601	$	8,027,187
Commercial letters of credit(a)	13,167		11,886
Standby letters of credit(c)	255,858		235,361

(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, 2018 or December 31, 2017.

(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.

(c)

The Corporation has established a liability of $3 million at June 30, 2018 and $2 million at December 31, 2017, 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, 2018			Year Ended December 31, 2017
	($ in Thousands)
Balance at beginning of period	$	987		$	900
Repurchase provision expense	150			246
Charge offs, net	(90		)	(159		)
Amount recorded at acquisition	88			—
Balance at end of period	$	1,135		$	987

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018 and December 31, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Hierarchy	June 30, 2018		December 31, 2017
		($ in Thousands)
Assets
Investment securities available for sale
U.S. Treasury securities	Level 1	$	996	$	996
Residential mortgage-related securities
FNMA / FHLMC	Level 2	396,709		464,768
GNMA	Level 2	2,210,189		1,913,350
Private-label	Level 2	1,031		1,059
GNMA commercial mortgage-related securities	Level 2	1,348,282		1,513,277
FFELP asset backed securities	Level 2	299,831		145,176
Other equity securities	Level 1	1,613		1,632
Other debt securities	Level 2	3,000		3,188
Total investment securities available for sale	Level 1	2,609		2,628
Total investment securities available for sale	Level 2	4,259,042		4,040,818
Residential loans held for sale	Level 2	143,022		85,544
Interest rate-related instruments	Level 2	62,708		28,494
Foreign currency exchange forwards	Level 2	3,317		2,495
Interest rate products (designated as hedging instruments)	Level 2	2,396		—
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	3,287		1,538
Commodity contracts	Level 2	66,894		38,686
Purchased options (time deposit)	Level 2	1,027		1,175
Liabilities
Interest rate-related instruments	Level 2	$	62,141	$	28,035
Foreign currency exchange forwards	Level 2	3,091		2,339
Forward commitments to sell residential mortgage loans	Level 3	919		313
Commodity contracts	Level 2	66,380		37,286
Written options (time deposit)	Level 2	1,027		1,175

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, 2018 and the year ended December 31, 2017, 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, 2016	$	200		$	3,114
Total net gains (losses) included in income
Mortgage derivative gain (loss)	—			(1,889		)
Transfer out of level 3 securities (a)	(200		)	—
Balance December 31, 2017	$	—		$	1,225
Total net gains (losses) included in income
Mortgage derivative gain (loss)	—			1,147
Balance June 30, 2018	$	—		$	2,372

(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 assets 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, 2018
Assets
Impaired loans(a)	Level 3	$	52,972	Provision for credit losses(b)	$	(12,431	)
Other real estate owned(c)	Level 2	1,954		Foreclosure / OREO expense, net	(808		)
Mortgage servicing rights	Level 3	84,585		Mortgage banking, net	607
December 31, 2017
Assets
Impaired loans(a)	Level 3	$	92,534	Provision for credit losses(b)	$	(32,159	)
Other real estate owned(c)	Level 2	2,604		Foreclosure / OREO expense, net	(939		)
Mortgage servicing rights	Level 3	64,387		Mortgage banking, net	(175		)

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

(b)

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, 2018
Mortgage servicing rights	Discounted cash flow	Discount rate	11%
Mortgage servicing rights	Discounted cash flow	Constant prepayment rate	9%
Impaired Loans	Appraisals / Discounted cash flow	Collateral / Discount factor	24%

Estimated fair values of financial instruments

Fair value estimates are set forth below for the Corporation’s financial instruments.

		June 30, 2018				December 31, 2017
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		($ in Thousands)
Financial assets
Cash and due from banks	Level 1	$	396,761	$	396,761	$	483,666	$	483,666
Interest-bearing deposits in other financial institutions	Level 1	71,462		71,462		199,702		199,702
Federal funds sold and securities purchased under agreements to resell	Level 1	3,150		3,150		32,650		32,650
Investment securities held to maturity	Level 2	2,602,247		2,560,943		2,282,853		2,283,574
Investment securities available for sale	Level 1	2,609		2,609		2,628		2,628
Investment securities available for sale	Level 2	4,259,042		4,259,042		4,040,818		4,040,818
FHLB and Federal Reserve Bank stocks	Level 2	249,040		249,040		165,331		165,331
Residential loans held for sale	Level 2	143,022		143,022		85,544		85,544
Loans, net	Level 3	22,724,184		22,282,282		20,519,111		20,314,984
Bank and corporate owned life insurance	Level 2	659,592		659,592		591,057		591,057
Derivatives (trading and other assets)	Level 2	136,342		136,342		70,850		70,850
Derivatives (trading and other assets)	Level 3	3,287		3,287		1,538		1,538
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	21,088,538	$	21,088,538	$	20,436,893	$	20,436,893
Brokered CDs and other time deposits	Level 2	2,727,776		2,727,776		2,349,069		2,349,069
Short-term funding	Level 2	626,525		626,525		676,282		676,282
Long-term funding	Level 2	4,925,476		4,921,348		3,397,450		3,411,368
Standby letters of credit(a)	Level 2	2,549		2,549		2,402		2,402
Derivatives (trading and other liabilities)	Level 2	132,639		132,639		68,835		68,835
Derivatives (trading and other liabilities)	Level 3	919		919		313		313

(a)

The commitment on standby letters of credit was $256 million and $235 million at June 30, 2018 and December 31, 2017, 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, 2018

Defined Benefit Plan [Abstract]

Net period benefit cost for the pension and postretirement plans

The components of net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for three and six months ended June 30, 2018 and 2017 were as follows.

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	($ in Thousands)
Components of Net Periodic Benefit Cost
RAP
Service cost	$	1,893		$	1,782		$	3,785		$	3,563
Interest cost	1,660			1,756			3,320			3,512
Expected return on plan assets	(4,755		)	(4,882		)	(9,510		)	(9,763		)
Amortization of prior service cost	(19		)	(18		)	(38		)	(37		)
Amortization of actuarial loss	463			487			925			975
Total net pension cost	$	(759	)	$	(875	)	$	(1,518	)	$	(1,750	)
Bank Mutual Pension Plan(a)
Interest cost	$	650		N/A			$	1,083		N/A
Expected return on plan assets	(1,060		)	N/A			(1,592		)	N/A
Total net pension cost	$	(410	)	N/A			$	(509	)	N/A
Postretirement Plan(b)
Interest cost	$	27		$	24		$	53		$	48
Amortization of prior service cost	(19		)	(19		)	(38		)	(38		)
Amortization of actuarial loss	2			—			4			—
Total net periodic benefit cost	$	10		$	5		$	19		$	10

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Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting Information [Line Items]

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, 2018
Net interest income	$	203,287		$	218,163		$	14,783		$	436,233
Noninterest income	26,876			150,286			6,059			183,222
Total revenue	230,163			368,449			20,842			619,455
Credit provision(a)	21,723			9,846			(27,569		)	4,000
Noninterest expense	81,025			265,700			77,498			424,223
Income (loss) before income taxes	127,415			92,904			(29,087		)	191,232
Income tax expense (benefit)	24,880			19,510			(11,806		)	32,583
Net income	$	102,535		$	73,394		$	(17,280	)	$	158,648
Return on average allocated capital (ROCET1)(b)	17.2		%	22.8		%	(7.5		)%	12.7		%
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(a)	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)(b)	12.6		%	13.1		%	1.1		%	10.6		%

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 2018
Average earning assets	$	11,729,745	$	10,271,021	$	7,849,775	$	29,850,541
Average loans	11,718,236		10,267,066		559,238		22,544,539
Average deposits	7,838,409		13,418,283		2,391,868		23,648,560
Average allocated capital (CET1)(b)	$	1,204,160	$	648,032	$	587,297	$	2,439,489
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)(b)	$	1,120,082	$	582,706	$	378,104	$	2,080,892

(a) The consolidated credit provision is equal to the actual reported provision for credit losses.

(b)

The Federal Reserve establishes capital adequacy requirements for the Corporation, including common equity Tier 1. For segment reporting purposes, the return on common equity Tier 1 ("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, 2018
Net interest income	$	107,330		$	114,620		$	4,413		$	226,362
Noninterest income	14,194			76,250			2,399			92,842
Total revenue	121,524			190,870			6,812			319,204
Credit provision(a)	11,126			4,880			(12,006		)	4,000
Noninterest expense	41,775			138,553			30,929			211,258
Income (loss) before income taxes	68,623			47,437			(12,111		)	103,947
Income tax expense (benefit)	13,454			9,962			(8,661		)	14,754
Net income (loss)	$	55,169		$	37,475		$	(3,450	)	$	89,192
Return on average allocated capital (ROCET1)(b)	17.9		%	22.7		%	(3.9		)%	14.0		%
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(a)	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)(b)	12.5		%	11.0		%	4.5		%	10.6		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended June 30, 2018
Average earning assets	$	12,066,538	$	10,402,680	$	7,943,487	$	30,412,705
Average loans	12,054,347		10,399,458		551,624		23,005,428
Average deposits	7,621,977		13,736,251		2,288,021		23,646,250
Average allocated capital (CET1)(b)	$	1,236,918	$	663,172	$	588,411	$	2,488,501
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)(b)	$	1,125,494	$	588,880	$	385,451	$	2,099,825

(a) The consolidated credit provision is equal to the actual reported provision for credit losses.

(b)

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, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of activity in accumulated other comprehensive income (loss)

The following tables summarize the components of accumulated other comprehensive income (loss) at June 30, 2018 and 2017 respectively, including changes during the preceding six and three month periods as well as any reclassifications out of accumulated other comprehensive income (loss).

($ in Thousands)	Investment Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2018	$	(38,453	)	$	(24,305	)	$	(62,758	)
Other comprehensive income (loss) before reclassifications	(60,754		)	—			(60,754		)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	2,015			—			2,015
Personnel expense	—			(76		)	(76		)
Other expense	—			929			929
Adjustment for adoption of ASU 2016-01	(84		)	—			(84		)
Adjustment for adoption of ASU 2018-02	(8,419		)	(5,235		)	(13,654		)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(632		)	—			(632		)
Income tax (expense) benefit	15,340			(216		)	15,124
Net other comprehensive income (loss) during period	(52,533		)	(4,597		)	(57,130		)
Balance June 30, 2018	$	(90,986	)	$	(28,902	)	$	(119,888	)
Balance January 1, 2017	$	(20,079	)	$	(34,600	)	$	(54,679	)
Other comprehensive income (loss) before reclassifications	3,632			—			3,632
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—			(75		)	(75		)
Other expense	—			975			975
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(2,575		)	—			(2,575		)
Income tax (expense) benefit	(406		)	(342		)	(748		)
Net other comprehensive income (loss) during period	651			558			1,209
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)

	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance April 1, 2018	$	(78,453	)	$	(29,220	)	$	(107,673	)
Other comprehensive income (loss) before reclassifications	(18,919		)	—			(18,919		)
Amounts reclassified from accumulated other comprehensive income (loss)
Investment securities losses (gains), net	2,015			—			2,015
Personnel expense	—			(38		)	(38		)
Other expense	—			465			465
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(335		)	—			(335		)
Income tax (expense) benefit	4,705			(109		)	4,596
Net other comprehensive income (loss) during period	(12,533		)	318			(12,215		)
Balance June 30, 2018	$	(90,986	)	$	(28,902	)	$	(119,888	)
Balance April 1, 2017	$	(22,023	)	$	(34,321	)	$	(56,344	)
Other comprehensive income (loss) before reclassifications	5,744			—			5,744
Amounts reclassified from accumulated other comprehensive income (loss)
Personnel expense	—			(37		)	(37		)
Other expense	—			487			487
Interest income (Amortization of net unrealized losses (gains)on available for sale securities transferred to held to maturity securities)	(1,548		)	—			(1,548		)
Income tax (expense) benefit	(1,601		)	(171		)	(1,772		)
Net other comprehensive income (loss) during period	2,595			279			2,874
Balance June 30, 2017	$	(19,428	)	$	(34,042	)	$	(53,470	)

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Revenues (Tables)

6 Months Ended

Jun. 30, 2018

Revenue Recognition [Abstract]

Disaggregation of Revenue by Major Source

The following table disaggregates the Corporation's revenue by major source for the three and six months ended June 30, 2018 and June 30, 2017.

Six Months Ended June 30, 2018
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	46,612	$	32	46,644
Service charges and deposit account fees	8,011			24,773		25		32,810
Card-based and loan fees(a)	674			19,691		67		20,432
Trust and asset management fees	—			26,806		—		26,806
Brokerage commissions and fees	—			13,902		267		14,169
Other revenue	(170		)	4,763		98		4,692
Noninterest Income (in-scope of Topic 606)	8,515			136,547		490		145,553
Noninterest Income (out-of-scope of Topic 606)	18,361			13,739		5,570		37,670
Total Noninterest Income	26,876			150,286		6,059		183,222
(a) Loan fees are out-of-scope of Topic 606.
Six Months Ended June 30, 2017
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	42,473	$	—	$	42,473
Service charges and deposit account fees	8,511			23,826		49		32,386
Card-based and loan fees(a)	592			16,973		11		17,575
Trust and asset management fees	—			24,281		—		24,281
Brokerage commissions and fees	—			8,679		—		8,679
Other revenue	82			4,315		105		4,502
Noninterest Income (in-scope of Topic 606)	9,184			120,547		165		129,896
Noninterest Income (out-of-scope of Topic 606)	15,306			10,132		6,906		32,344
Total Noninterest Income	24,490			130,679		7,072		162,241
(a) Loan fees are out-of-scope of Topic 606.

Three Months Ended June 30, 2018
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	23,988	$	7	$	23,996
Service charges and deposit account fees	3,786			12,590		13		16,390
Card-based and loan fees(a)	358			10,162		42		10,562
Trust and asset management fees	—			13,437		—		13,437
Brokerage commissions and fees	—			6,870		26		6,896
Other revenue	(825		)	2,302		68		1,545
Noninterest Income (in-scope of Topic 606)	3,320			69,349		156		72,825
Noninterest Income (out-of-scope of Topic 606)	10,874			6,901		2,242		20,017
Total Noninterest Income	14,194			76,250		2,399		92,842
(a) Loan fees are out-of-scope of Topic 606.
Three Months Ended June 30, 2017
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Insurance commissions and fees	$	—		$	20,853	$	—	$	20,853
Service charges and deposit account fees	4,070			11,938		23		16,030
Card-based and loan fees(a)	320			8,829		5		9,154
Trust and asset management fees	—			12,346		—		12,346
Brokerage commissions and fees	—			4,346		—		4,346
Other revenue	37			2,196		53		2,286
Noninterest Income (in-scope of Topic 606)	4,426			60,507		81		65,014
Noninterest Income (out-of-scope of Topic 606)	8,071			5,302		4,022		17,395
Total Noninterest Income	12,497			65,809		4,104		82,410
(a) Loan fees are out-of-scope of Topic 606.

Revenue Recognition 606 [Text Block]

Below is a listing of performance obligations for the Corporation's main revenue streams.

Revenue Stream	Noninterest income in-scope of Topic 606
Insurance commissions and fees	The Corporation's insurance revenue has two distinct performance obligations. The first performance obligation is the selling of the policy as an agent for the carrier. This performance obligation is satisfied upon binding of the policy. The second performance obligation is the ongoing servicing of the policy which is satisfied over the life of the policy. For employee benefits, the payment is typically received monthly. For property and casualty, payments can vary, but are typically received at, or in advance, of the policy period.
Service charges and deposit account fees	Service charges on deposit accounts consist of monthly service fees (i.e. business analysis fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts.
Card-based and loan fees(a)	Card-based and loan fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month.
Trust and asset management fees	Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered.
Brokerage commissions and fees	Brokerage commissions and fees primarily consists of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service.

(a) Loan fees are out-of-scope of Topic 606.

Arrangements with Multiple Performance Obligations

The Corporation's contracts with customers may include multiple performance obligations. For such arrangements, we allocate revenue to each performance obligation based on its relative standalone selling price. We generally determine standalone selling prices based on the expected cost plus margin.

Practical Expedients

We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

Using the practical expedient, for contracts with a term of one year or less, the Corporation recognizes incremental costs of obtaining those contracts as an expense when incurred.

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Acquisitions - Bank Mutual Acquisition (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Feb. 01, 2018	Dec. 31, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,166,665		$ 976,239
Total liabilities	$ 2,828,448			$ 0
Purchase Accounting Adjustments
Business Acquisition [Line Items]
Cash and cash equivalents		$ 0
Investment securities		(6,238)
Federal Home Loan Bank stock, at cost		0
Loans		(48,043)
Premises and equipment, net		5,180
Bank owned life insurance		(24)
Goodwill
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet)		58,100
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet)		989
Others assets		6,153
Deposits		2,498
Other borrowings		1,875
Other liabilities		4,370
BKMU Assets Acquired, Liabilities Assumed
Business Acquisition [Line Items]
Cash and cash equivalents		78,052
Investment securities		452,867
Federal Home Loan Bank stock, at cost		20,026
Loans		1,875,877
Premises and equipment, net		44,939
Bank owned life insurance		65,390
Goodwill		173,243
Core deposit intangibles (included in other intangible assets, net on the face of the Consolidated Balance Sheet)		58,100
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheet)		5,638
Others assets		46,257
Total assets		2,820,389
Deposits		1,840,950
Other borrowings		431,886
Other liabilities		65,864
Total liabilities		2,338,701
Total consideration paid		$ 481,688

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Acquisitions - Narrative (Details) - USD ($)				3 Months Ended	6 Months Ended
	Jun. 01, 2018	Feb. 01, 2018	Jan. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Value of stock transaction					$ 137,000	$ 0
Bank Mutual
Business Acquisition [Line Items]
Number of shares received by shareholders (in shares)		0.422
Number of shares issued			19,500,000
Value of stock transaction		$ 482,000,000
Goodwill acquired		$ 173,000,000			173,000,000
Amortization period		10 years
Additions to finite-lived intangible assets				$ 58,000,000
BKMU Assets Acquired Liabilities Assumed IncreaseDecrease [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		$ 6,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, OREO		$ 1,000,000
Business Combination, Acquired Receivables, IncreaseDecrease		less than $1 million
Anderson Insurance Investment Agency [Domain]
Business Acquisition [Line Items]
Goodwill acquired	$ 7,000,000			7,000,000
Amortization period	7 years
Value of acquisition	$ 10,000,000
Additions to finite-lived intangible assets	$ 3,000,000			3,000,000
Diversified Insurance Solutions
Business Acquisition [Line Items]
Goodwill acquired					$ 10,000,000
Amortization period		10 years
Value of acquisition				$ 19,000,000
Additions to finite-lived intangible assets		$ 8,000,000

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Summary of Significant Accounting Policies textuals (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expense Reclass (asu 2017-07)		$ 9,000
Visa Restricted Stock Owned		119
AOCI Attributable to Parent [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reporting Comprehensive Income(2018-02)	$ 13,654	$ 13,654

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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Calculations for basic and diluted earnings per common share
Net income	$ 89,192	$ 57,983	$ 158,648	$ 114,253
Preferred stock dividends	(2,329)	(2,339)	(4,668)	(4,669)
Net income available to common equity	86,863	55,644	153,980	109,584
Common shareholder dividends	(25,977)	(18,326)	(51,549)	(36,577)
Unvested share-based payment awards	(130)	(110)	(269)	(227)
Undistributed earnings	60,756	37,208	102,162	72,780
Undistributed earnings allocated to common shareholders	60,446	36,980	101,677	72,273
Undistributed earnings allocated to unvested share-based payment awards	310	228	485	507
Undistributed earnings	60,756	37,208	102,162	72,780
Basic
Distributed earnings to common shareholders	25,977	18,326	51,549	36,577
Undistributed earnings allocated to common shareholders	60,446	36,980	101,677	72,273
Total common shareholders earnings, basic	86,423	55,306	153,226	108,850
Diluted
Distributed earnings to common shareholders	25,977	18,326	51,549	36,577
Undistributed earnings allocated to common shareholders	60,446	36,980	101,677	72,273
Total common shareholders earnings, diluted	$ 86,423	$ 55,306	$ 153,226	$ 108,850
Weighted average common shares outstanding (in shares)	170,633	151,573	167,096	151,196
Effect of dilutive common stock awards (in shares)	2,146	1,958	2,080	2,155
Effect of dilutive common stock warrants (in shares)	630	771	744	796
Diluted weighted average common shares outstanding (in shares)	173,409	154,302	169,920	154,147
Basic earnings (loss) per common share (in usd per share)	$ 0.51	$ 0.36	$ 0.92	$ 0.72
Diluted earnings (loss) per common share (in usd per share)	$ 0.50	$ 0.36	$ 0.90	$ 0.71

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Earnings Per Common Share (Textual) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				4,000
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
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	1,500	1,000	1,400	900

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Stock-Based Compensation, Stock Option Activity (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair value assumptions of stock options
Dividend yield	2.50%	2.00%
Risk-free interest rate	2.60%	2.00%
Weighted average expected volatility	22.00%	25.00%
Weighted average expected life	5 years 9 months	5 years 6 months
Weighted average per share fair value of stock options (in usd per share)	$ 4.47	$ 5.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	5,118,687
Granted (in shares)	938,740
Exercised (in shares)	(888,661)
Forfeited or expired (in shares)	(38,613)
Stock Options Shares Outstanding, Ending balance (in shares)	5,500,204		5,118,687
Options exercisable (in shares)	3,287,488
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)	$ 18.02
Granted, Weighted Average Exercise Price (in usd per share)	$ 24.50
Shares used in acquisition	$ 370,051
Exercised, Weighted Average Exercise Price (in usd per share)	$ 16.69
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	24.21
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	$ 19.05		$ 18.02
Ex Share Price at Acquisition	$ 14.35
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 16.80
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 8 months 8 days		6 years 5 months 23 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 20 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 45,418,000		$ 38,028,000
Options exercisable, Aggregate Intrinsic Value	$ 34,551,000

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Stock-Based Compensation, Restricted Stock Activity (Details)	6 Months Ended
	Jun. 30, 2018 $ / 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	2,026,071
Granted (in shares) | shares	573,877
Vested (in shares) | shares	(537,881)
Forfeited (in shares) | shares	(30,480)
Outstanding Shares, Ending balance (in shares) | shares	2,031,587
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	$ 19.68
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	24.65
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	18.21
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	22.16
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 21.87

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Stock-Based Compensation (Details Textuals) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Stock Based Compensation (Textuals) [Abstract]
Intrinsic value of stock options exercised	$ 9	$ 11
Total fair value of vested stock options	$ 4	$ 4
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%
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
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
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	$ 2
String_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	less than $1 million
Unvested share-based payment awards	$ 7
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter 2022
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	$ 6	$ 11
Recognized compensation expense for accelerated vesting of stock options	1
Unvested share-based payment awards	$ 25
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter 2022

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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment securities available for sale:
Amortized Cost	$ 4,377,443	$ 4,100,417
Gross Unrealized Gains	7,275	10,996
Gross Unrealized Losses	(123,068)	(67,967)
Fair Value	4,261,651	4,043,446
Held to Maturity Amortized Cost	2,602,247	2,282,853
Held-to-maturity, Gross Unrealized Gains	15,553	26,543
Held-to-maturity, Gross Unrealized Loss	(56,856)	(25,822)
Held-to-maturity, Fair Value	2,560,943	2,283,574
US Treasury Securities
Investment securities available for sale:
Amortized Cost	1,001	1,003
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(7)
Fair Value	996	996
Obligations of state and political subdivisions (municipal securities)
Investment securities available for sale:
Held to Maturity Amortized Cost	1,593,147	1,281,320
Held-to-maturity, Gross Unrealized Gains	4,851	13,899
Held-to-maturity, Gross Unrealized Loss	(17,698)	(3,177)
Held-to-maturity, Fair Value	1,580,300	1,292,042
Residential Related Securities | FNMA and FHLMC
Investment securities available for sale:
Amortized Cost	396,368	457,680
Gross Unrealized Gains	5,573	9,722
Gross Unrealized Losses	(5,232)	(2,634)
Fair Value	396,709	464,768
Held to Maturity Amortized Cost	97,822	40,995
Held-to-maturity, Gross Unrealized Gains	191	398
Held-to-maturity, Gross Unrealized Loss	(2,306)	(489)
Held-to-maturity, Fair Value	95,707	40,904
Residential Related Securities | GNMA
Investment securities available for sale:
Amortized Cost	2,275,481	1,944,453
Gross Unrealized Gains	23	275
Gross Unrealized Losses	(65,315)	(31,378)
Fair Value	2,210,189	1,913,350
Held to Maturity Amortized Cost	388,174	414,440
Held-to-maturity, Gross Unrealized Gains	1,969	2,700
Held-to-maturity, Gross Unrealized Loss	(13,020)	(6,400)
Held-to-maturity, Fair Value	377,123	410,740
Private Label
Investment securities available for sale:
Amortized Cost	1,037	1,067
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	(8)
Fair Value	1,031	1,059
Held to Maturity Amortized Cost	0
Held-to-maturity, Fair Value	0
GNMA Commercial Mortgage-Related Securities
Investment securities available for sale:
Amortized Cost	1,400,680	1,547,173
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(52,399)	(33,901)
Fair Value	1,348,282	1,513,277
Held to Maturity Amortized Cost	523,103
Held-to-maturity, Gross Unrealized Gains	8,542
Held-to-maturity, Gross Unrealized Loss	(23,832)
Held-to-maturity, Fair Value	507,813
GNMA Commercial Mortgage-Related Securities | GNMA
Investment securities available for sale:
Held to Maturity Amortized Cost		546,098
Held-to-maturity, Gross Unrealized Gains		9,546
Held-to-maturity, Gross Unrealized Loss		(15,756)
Held-to-maturity, Fair Value		539,888
Asset backed Securities
Investment securities available for sale:
Amortized Cost	298,263
Gross Unrealized Gains	1,679
Gross Unrealized Losses	(111)
Fair Value	299,831
Held to Maturity Amortized Cost	0
Held-to-maturity, Fair Value	0
Other Debt And Other Equity Securities
Investment securities available for sale:
Amortized Cost	3,000	3,200
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(12)
Fair Value	3,000	3,188
Equity Securities [Member]
Investment securities available for sale:
Amortized Cost	1,613	1,519
Gross Unrealized Gains	0	127
Gross Unrealized Losses	0	(14)
Fair Value	1,613	1,632
Held to Maturity Amortized Cost	0
Held-to-maturity, Fair Value	0
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Investment securities available for sale:
Amortized Cost		144,322
Gross Unrealized Gains		867
Gross Unrealized Losses		(13)
Fair Value		$ 145,176
Investment Securities Class [Domain]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Securities Received as Collateral	$ 3,100,000

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Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost
Available for Sale, Due in one year or less	$ 3,001
Available for Sale, Due after one year through five years	1,000
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	4,001
Investment securities available for sale, amortized cost	4,377,443	$ 4,100,417
Fair Value
Available for Sale, Due in one year or less	2,996
Available for Sale, Due after one year through five years	1,000
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	3,996
Investment securities available for sale, at fair value	$ 4,261,651	4,043,446
Ratio of Fair Value to Amortized Cost	97.40%
Amortized Cost
Held to Maturity, Due in one year or less	$ 46,938
Held to Maturity, Due after one year through five years	200,725
Held to Maturity, Due after five years through ten years	366,997
Held to Maturity, Due after ten years	978,487
Held to Maturity, Debt Securities, Amortized Cost Basis	1,593,147
Held to Maturity Amortized Cost	2,602,247	2,282,853
Fair Value
Held to Maturity, Due in one year or less	47,269
Held to Maturity, Due after one year through five years	199,266
Held to Maturity, Due after five years through ten years	361,260
Held to Maturity, Due after ten years	972,504
Held to Maturity, Securities, Debt Securities	1,580,300
Held to Maturity, Total debt securities	$ 2,560,943	2,283,574
Ratio of Fair Value to Amortized Cost	98.40%
Private Label
Amortized Cost
Investment securities available for sale, amortized cost	$ 1,037	1,067
Fair Value
Investment securities available for sale, at fair value	1,031	1,059
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	1,400,680	1,547,173
Fair Value
Investment securities available for sale, at fair value	1,348,282	1,513,277
Amortized Cost
Held to Maturity Amortized Cost	523,103
Fair Value
Held to Maturity, Total debt securities	507,813
Asset backed Securities
Amortized Cost
Investment securities available for sale, amortized cost	298,263
Fair Value
Investment securities available for sale, at fair value	299,831
Amortized Cost
Held to Maturity Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities	0
Equity Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	1,613	1,519
Fair Value
Investment securities available for sale, at fair value	1,613	1,632
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	396,368	457,680
Fair Value
Investment securities available for sale, at fair value	396,709	464,768
Amortized Cost
Held to Maturity Amortized Cost	97,822	40,995
Fair Value
Held to Maturity, Total debt securities	95,707	40,904
GNMA | Residential Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	2,275,481	1,944,453
Fair Value
Investment securities available for sale, at fair value	2,210,189	1,913,350
Amortized Cost
Held to Maturity Amortized Cost	388,174	414,440
Fair Value
Held to Maturity, Total debt securities	$ 377,123	410,740
GNMA | GNMA Commercial Mortgage-Related Securities
Amortized Cost
Held to Maturity Amortized Cost		546,098
Fair Value
Held to Maturity, Total debt securities		$ 539,888

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Investment Securities Gain/Loss Sale of Securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Gross gains on available for sale securities	$ 0	$ 0
Gross gains on held to maturity securities	0	361
Total gains	0	361
Gross losses on available for sale securities	(2,015)	0
Gross losses on held to maturity securities	0	(5)
Total losses	(2,015)	(5)
Investment securities gains (losses), net	(2,015)	356
Proceeds from sales of investment securities	$ 493,060	$ 16,059

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Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Jun. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (41,975)	$ (15,099)
Unrealized losses on available for sale securities, 12 months or more	(81,093)	(52,868)
Total unrealized losses on available for sale securities	(123,068)	(67,967)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,939,830	1,593,503
Fair value of unrealized losses on available for sale securities, 12 months or more	1,950,298	1,906,992
Total fair value of unrealized losses on available for sale securities	$ 3,890,128	$ 3,500,495
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	110	92
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	120	105
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (20,207)	$ (4,491)
Unrealized losses on held to maturity securities, 12 months or more	(36,648)	(21,331)
Total unrealized losses on held to maturity securities	$ (56,856)	$ (25,822)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	196	183
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 950,678	$ 457,289
Fair value of unrealized losses on held to maturity securities, 12 months or more	758,635	751,088
Total fair value of unrealized losses on held to maturity securities	$ 1,709,313	$ 1,208,377
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	977	202
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	$ 0
Unrealized losses on available for sale securities, 12 months or more	(6)
Total unrealized losses on available for sale securities	(6)
Fair value of unrealized losses on available for sale securities, less than 12 months	0
Fair value of unrealized losses on available for sale securities, 12 months or more	996
Total fair value of unrealized losses on available for sale securities	$ 996
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	0
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	1
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	$ (10,814)	$ (746)
Unrealized losses on held to maturity securities, 12 months or more	(6,884)	(2,431)
Total unrealized losses on held to maturity securities	(17,698)	(3,177)
Fair value of unrealized losses on held to maturity securities, less than 12 months	609,381	122,761
Fair value of unrealized losses on held to maturity securities, 12 months or more	128,244	127,043
Total fair value of unrealized losses on held to maturity securities	$ 737,625	$ 249,804
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	890	157
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	142	132
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	(5)	(8)
Total unrealized losses on available for sale securities	(5)	(8)
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	1,031	1,059
Total fair value of unrealized losses on available for sale securities	$ 1,031	$ 1,059
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	$ (8,821)	$ (5,554)
Unrealized losses on available for sale securities, 12 months or more	(43,577)	(28,347)
Total unrealized losses on available for sale securities	(52,398)	(33,901)
Fair value of unrealized losses on available for sale securities, less than 12 months	284,733	480,514
Fair value of unrealized losses on available for sale securities, 12 months or more	1,063,701	1,026,642
Total fair value of unrealized losses on available for sale securities	$ 1,348,434	$ 1,507,156
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	22	33
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	80	70
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (813)
Unrealized losses on held to maturity securities, 12 months or more	(23,019)
Total unrealized losses on held to maturity securities	(23,832)
Fair value of unrealized losses on held to maturity securities, less than 12 months	29,243
Fair value of unrealized losses on held to maturity securities, 12 months or more	478,570
Total fair value of unrealized losses on held to maturity securities	$ 507,813
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	1
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	24
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (111)	$ (13)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(111)	(13)
Fair value of unrealized losses on available for sale securities, less than 12 months	100,757	12,158
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	$ 100,757	$ 12,158
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	7	1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	0
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		$ (12)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(12)
Fair value of unrealized losses on available for sale securities, less than 12 months		188
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		$ 188
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
Equity Securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months		$ (14)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(14)
Fair value of unrealized losses on available for sale securities, less than 12 months		1,487
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		$ 1,487
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security		3
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security		0
FNMA and FHLMC | 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		$ (7)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(7)
Fair value of unrealized losses on available for sale securities, less than 12 months		996
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		$ 996
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
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	$ (1,613)	$ (572)
Unrealized losses on available for sale securities, 12 months or more	(3,620)	(2,062)
Total unrealized losses on available for sale securities	(5,233)	(2,634)
Fair value of unrealized losses on available for sale securities, less than 12 months	100,946	69,939
Fair value of unrealized losses on available for sale securities, 12 months or more	128,509	142,093
Total fair value of unrealized losses on available for sale securities	$ 229,455	$ 212,032
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	19	9
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	9	9
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (1,518)	$ (73)
Unrealized losses on held to maturity securities, 12 months or more	(788)	(417)
Total unrealized losses on held to maturity securities	(2,306)	(490)
Fair value of unrealized losses on held to maturity securities, less than 12 months	76,046	13,143
Fair value of unrealized losses on held to maturity securities, 12 months or more	14,728	16,262
Total fair value of unrealized losses on held to maturity securities	$ 90,774	$ 29,405
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	25	8
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	10	10
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	$ (31,430)	$ (8,927)
Unrealized losses on available for sale securities, 12 months or more	(33,885)	(22,451)
Total unrealized losses on available for sale securities	(65,315)	(31,378)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,453,394	1,028,221
Fair value of unrealized losses on available for sale securities, 12 months or more	756,061	737,198
Total fair value of unrealized losses on available for sale securities	$ 2,209,455	$ 1,765,419
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	62	44
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	29	25
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (7,062)	$ (3,373)
Unrealized losses on held to maturity securities, 12 months or more	(5,957)	(3,026)
Total unrealized losses on held to maturity securities	(13,019)	(6,399)
Fair value of unrealized losses on held to maturity securities, less than 12 months	236,008	268,388
Fair value of unrealized losses on held to maturity securities, 12 months or more	137,093	120,892
Total fair value of unrealized losses on held to maturity securities	$ 373,101	$ 389,280
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	61	35
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	20	18
GNMA | GNMA Commercial Mortgage-Related Securities
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months		$ (299)
Unrealized losses on held to maturity securities, 12 months or more		(15,457)
Total unrealized losses on held to maturity securities		(15,756)
Fair value of unrealized losses on held to maturity securities, less than 12 months		52,997
Fair value of unrealized losses on held to maturity securities, 12 months or more		486,891
Total fair value of unrealized losses on held to maturity securities		$ 539,888
GNMA | 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		2
GNMA | 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		23

XML

Investment Securities (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value	$ 40
Investment Securities (Textuals) [Abstract]
Debt Securities, Available-for-sale, Sold at Par Value	40
Debt Securities, Held-to-maturity, Sold, Amount		$ 16
Federal Home Loan Bank Stock	173		$ 89
Federal Reserve Bank Stock	76		$ 76
Bank Mutual [Member]
Business Acquisition [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value	453
Investment Securities (Textuals) [Abstract]
Debt Securities, Available-for-sale, Sold at Par Value	$ 453

XML

Loans Composition (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 22,976,786	$ 20,784,991
Purchased credit-impaired loans	211,687	247,575
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,109,796	6,399,693
Purchased credit-impaired loans	110,993	142,244
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans	888,330	802,209
Purchased credit-impaired loans	20,255	26,234
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,998,126	7,201,902
Purchased credit-impaired loans	131,248	168,478
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Total loans	3,996,415	3,315,254
Purchased credit-impaired loans	16,381	19,118
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,487,159	1,451,684
Purchased credit-impaired loans	448	467
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	5,483,574	4,766,938
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	13,481,700	11,968,840
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans	8,207,253	7,546,534
Purchased credit-impaired loans	51,469	47,486
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	911,363	883,804
Purchased credit-impaired loans	11,092	10,891
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	376,470	385,813
Purchased credit-impaired loans	1,049	1,135
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	9,495,086	$ 8,816,151
Bank Mutual [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Purchased Credit Impaired Loans And Covered Loans	$ 16,000

XML

Loans Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 22,976,786	$ 20,784,991
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	22,331,647	20,171,876
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	199,162	227,692
Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	241,517	176,877
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	204,460	208,546
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	7,109,796	6,399,693
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	6,763,557	6,015,884
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	92,286	157,245
Commercial and industrial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	172,177	113,778
Commercial and industrial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	81,776	112,786
Commercial real estate — owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans	888,330	802,209
Commercial real estate — owner occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	814,769	723,291
Commercial real estate — owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	16,033	14,181
Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	38,879	41,997
Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	18,649	22,740
Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Loans	7,998,126	7,201,902
Commercial and business lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	7,578,326	6,739,175
Commercial and business lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	108,319	171,426
Commercial and business lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	211,056	155,775
Commercial and business lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	100,425	135,526
Commercial real estate — investor
Financing Receivable, Recorded Investment [Line Items]
Loans	3,996,415	3,315,254
Commercial real estate — investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	3,885,535	3,266,389
Commercial real estate — investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	59,587	24,845
Commercial real estate — investor | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	24,790	19,291
Commercial real estate — investor | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	26,503	4,729
Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans	1,487,159	1,451,684
Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,452,888	1,421,504
Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	29,559	29,206
Real estate construction | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	3,168	0
Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	1,544	974
Commercial real estate lending
Financing Receivable, Recorded Investment [Line Items]
Loans	5,483,574	4,766,938
Commercial real estate lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	5,338,423	4,687,893
Commercial real estate lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	89,146	54,051
Commercial real estate lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	27,958	19,291
Commercial real estate lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	28,047	5,703
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	13,481,700	11,968,840
Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	12,916,749	11,427,068
Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	197,465	225,477
Total commercial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	239,014	175,066
Total commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	128,472	141,229
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	8,207,253	7,546,534
Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	8,141,803	7,490,860
Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	199	426
Residential mortgage | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	2,355	1,616
Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	62,896	53,632
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans	911,363	883,804
Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	897,471	868,958
Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	792	1,137
Home equity | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	142	195
Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	12,958	13,514
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	376,470	385,813
Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	375,624	384,990
Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	706	652
Other consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	6	0
Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	134	171
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	9,495,086	8,816,151
Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	9,414,898	8,744,808
Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,697	2,215
Total consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	2,503	1,811
Total consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 75,988	$ 67,317

XML

Loans Past Due Status (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Summarized details of Loans
Current	$ 22,730,767,000	$ 20,555,250,000
Nonaccrual	204,460,000	208,546,000
Total loans	22,976,786,000	20,784,991,000
Accruing loans past due 90 days or more	2,000,000	2,000,000
Nonaccrual Loans, Current Portion	$ 141,000,000	$ 135,000,000
Percent of current nonaccrual loans	69.00%	65.00%
30-59 Days Past Due
Summarized details of Loans
Total Past Due	$ 37,857,000	$ 16,861,000
60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,863,000	2,467,000
90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,839,000	1,867,000
Commercial and industrial
Summarized details of Loans
Current	7,027,210,000	6,286,369,000
Nonaccrual	81,776,000	112,786,000
Total loans	7,109,796,000	6,399,693,000
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	407,000	170,000
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	181,000	101,000
Commercial and industrial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	222,000	267,000
Commercial real estate — owner occupied
Summarized details of Loans
Current	869,488,000	779,421,000
Nonaccrual	18,649,000	22,740,000
Total loans	888,330,000	802,209,000
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	193,000	48,000
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0
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	7,896,698,000	7,065,790,000
Nonaccrual	100,425,000	135,526,000
Total loans	7,998,126,000	7,201,902,000
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	600,000	218,000
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	181,000	101,000
Commercial and business lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	222,000	267,000
Commercial real estate — investor
Summarized details of Loans
Current	3,969,084,000	3,310,000,000
Nonaccrual	26,503,000	4,729,000
Total loans	3,996,415,000	3,315,254,000
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	828,000	374,000
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial real estate — investor | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	151,000
Real estate construction
Summarized details of Loans
Current	1,465,850,000	1,450,459,000
Nonaccrual	1,544,000	974,000
Total loans	1,487,159,000	1,451,684,000
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	19,765,000	168,000
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	83,000
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	5,434,934,000	4,760,459,000
Nonaccrual	28,047,000	5,703,000
Total loans	5,483,574,000	4,766,938,000
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	20,593,000	542,000
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	83,000
Commercial real estate lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	151,000
Total commercial
Summarized details of Loans
Current	13,331,632,000	11,826,249,000
Nonaccrual	128,472,000	141,229,000
Total loans	13,481,700,000	11,968,840,000
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	21,193,000	760,000
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	181,000	184,000
Total commercial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	222,000	418,000
Residential mortgage
Summarized details of Loans
Current	8,135,016,000	7,483,350,000
Nonaccrual	62,896,000	53,632,000
Total loans	8,207,253,000	7,546,534,000
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	9,158,000	9,186,000
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	183,000	366,000
Residential mortgage | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Home equity
Summarized details of Loans
Current	891,135,000	863,465,000
Nonaccrual	12,958,000	13,514,000
Total loans	911,363,000	883,804,000
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,534,000	5,688,000
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	736,000	1,137,000
Home equity | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Other consumer
Summarized details of Loans
Current	372,984,000	382,186,000
Nonaccrual	134,000	171,000
Total loans	376,470,000	385,813,000
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	972,000	1,227,000
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	763,000	780,000
Other consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,617,000	1,449,000
Total consumer
Summarized details of Loans
Current	9,399,135,000	8,729,001,000
Nonaccrual	75,988,000	67,317,000
Total loans	9,495,086,000	8,816,151,000
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	16,664,000	16,101,000
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,682,000	2,283,000
Total consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,617,000	$ 1,449,000

XML

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, 2018	Dec. 31, 2017
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 211,687	$ 247,575
Unpaid Principal Balance	233,765	275,814
Related Allowance	32,497	25,846
Average Recorded Investment	205,083	236,860
Interest Income Recognized	$ 2,760	$ 8,051
Net Recorded Investment of the Impaired Loans	77.00%	80.00%
Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 157,951	$ 175,681
Unpaid Principal Balance	165,749	181,002
Related Allowance	32,497	25,846
Average Recorded Investment	152,073	140,098
Interest Income Recognized	2,882	7,254
Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	53,736	71,894
Unpaid Principal Balance	68,016	94,812
Related Allowance	0	0
Average Recorded Investment	53,010	96,762
Interest Income Recognized	122	797
Commercial and industrial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	110,993	142,244
Unpaid Principal Balance	125,787	166,418
Related Allowance	17,628	10,838
Average Recorded Investment	109,283	147,769
Interest Income Recognized	439	3,121
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	75,928	81,649
Unpaid Principal Balance	77,873	83,579
Related Allowance	17,628	10,838
Average Recorded Investment	70,082	58,494
Interest Income Recognized	725	2,629
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	35,065	60,595
Unpaid Principal Balance	47,914	82,839
Related Allowance	0	0
Average Recorded Investment	39,201	89,275
Interest Income Recognized	286	492
Commercial real estate — owner occupied
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,255	26,234
Unpaid Principal Balance	21,773	26,766
Related Allowance	829	2,973
Average Recorded Investment	19,828	14,072
Interest Income Recognized	119	772
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	15,386	23,796
Unpaid Principal Balance	15,853	23,937
Related Allowance	829	2,973
Average Recorded Investment	15,649	12,124
Interest Income Recognized	95	736
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	4,869	2,438
Unpaid Principal Balance	5,920	2,829
Related Allowance	0	0
Average Recorded Investment	4,179	1,948
Interest Income Recognized	24	36
Commercial and business lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	131,248	168,478
Unpaid Principal Balance	147,560	193,184
Related Allowance	18,457	13,811
Average Recorded Investment	129,111	161,841
Interest Income Recognized	558	3,893
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	91,314	105,445
Unpaid Principal Balance	93,726	107,516
Related Allowance	18,457	13,811
Average Recorded Investment	85,731	70,618
Interest Income Recognized	820	3,365
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	39,934	63,033
Unpaid Principal Balance	53,834	85,668
Related Allowance	0	0
Average Recorded Investment	43,380	91,223
Interest Income Recognized	262	528
Commercial real estate — investor
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	16,381	19,118
Unpaid Principal Balance	16,500	19,157
Related Allowance	4,132	1,597
Average Recorded Investment	16,491	16,924
Interest Income Recognized	901	1,739
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	15,397	17,823
Unpaid Principal Balance	15,469	17,862
Related Allowance	4,132	1,597
Average Recorded Investment	15,485	16,924
Interest Income Recognized	901	1,694
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	984	1,295
Unpaid Principal Balance	1,031	1,295
Related Allowance	0	0
Average Recorded Investment	1,006	0
Interest Income Recognized	0	45
Real estate construction
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	448	467
Unpaid Principal Balance	523	578
Related Allowance	77	86
Average Recorded Investment	456	484
Interest Income Recognized	15	29
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	448	467
Unpaid Principal Balance	523	578
Related Allowance	77	86
Average Recorded Investment	456	484
Interest Income Recognized	15	29
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	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	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	16,829	19,585
Unpaid Principal Balance	17,023	19,735
Related Allowance	4,209	1,683
Average Recorded Investment	16,947	17,408
Interest Income Recognized	916	1,768
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	15,845	18,290
Unpaid Principal Balance	15,992	18,440
Related Allowance	4,209	1,683
Average Recorded Investment	15,941	17,408
Interest Income Recognized	916	1,723
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	984	1,295
Unpaid Principal Balance	1,031	1,295
Related Allowance	0	0
Average Recorded Investment	1,006	0
Interest Income Recognized	0	45
Total commercial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	148,077	188,063
Unpaid Principal Balance	164,583	212,919
Related Allowance	22,666	15,494
Average Recorded Investment	146,058	179,249
Interest Income Recognized	1,474	5,661
Total commercial | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	107,159	123,735
Unpaid Principal Balance	109,718	125,956
Related Allowance	22,666	15,494
Average Recorded Investment	101,672	88,026
Interest Income Recognized	1,736	5,088
Total commercial | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	40,918	64,328
Unpaid Principal Balance	54,865	86,963
Related Allowance	0	0
Average Recorded Investment	44,386	91,223
Interest Income Recognized	262	573
Residential mortgage
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	51,469	47,486
Unpaid Principal Balance	56,033	50,126
Related Allowance	6,208	6,512
Average Recorded Investment	47,272	45,410
Interest Income Recognized	991	1,831
Residential mortgage | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	39,926	40,561
Unpaid Principal Balance	44,171	42,922
Related Allowance	6,208	6,512
Average Recorded Investment	39,433	40,411
Interest Income Recognized	863	1,614
Residential mortgage | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,543	6,925
Unpaid Principal Balance	11,862	7,204
Related Allowance	0	0
Average Recorded Investment	7,839	4,999
Interest Income Recognized	128	217
Home equity
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,092	10,891
Unpaid Principal Balance	12,098	11,631
Related Allowance	3,514	3,718
Average Recorded Investment	10,702	11,061
Interest Income Recognized	294	556
Home equity | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,817	10,250
Unpaid Principal Balance	10,809	10,986
Related Allowance	3,514	3,718
Average Recorded Investment	9,917	10,521
Interest Income Recognized	282	549
Home equity | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,275	641
Unpaid Principal Balance	1,289	645
Related Allowance	0	0
Average Recorded Investment	785	540
Interest Income Recognized	12	7
Other consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,049	1,135
Unpaid Principal Balance	1,051	1,138
Related Allowance	109	122
Average Recorded Investment	1,051	1,140
Interest Income Recognized	1	3
Other consumer | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,049	1,135
Unpaid Principal Balance	1,051	1,138
Related Allowance	109	122
Average Recorded Investment	1,051	1,140
Interest Income Recognized	1	3
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	63,610	59,512
Unpaid Principal Balance	69,182	62,895
Related Allowance	9,831	10,352
Average Recorded Investment	59,025	57,611
Interest Income Recognized	1,286	2,390
Total consumer | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	50,792	51,946
Unpaid Principal Balance	56,031	55,046
Related Allowance	9,831	10,352
Average Recorded Investment	50,401	52,072
Interest Income Recognized	1,146	2,166
Total consumer | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	12,818	7,566
Unpaid Principal Balance	13,151	7,849
Related Allowance	0	0
Average Recorded Investment	8,624	5,539
Interest Income Recognized	$ 140	$ 224

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Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 63,723	$ 74,618
Nonaccrual Restructured Loans	38,005	23,486
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	32,438	30,047
Nonaccrual Restructured Loans	155	1,776
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	3,820	3,989
Nonaccrual Restructured Loans	0	0
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	372	14,389
Nonaccrual Restructured Loans	14,268	0
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	222	310
Nonaccrual Restructured Loans	226	157
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	17,934	17,068
Nonaccrual Restructured Loans	20,372	18,991
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,900	7,705
Nonaccrual Restructured Loans	2,972	2,537
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,037	1,110
Nonaccrual Restructured Loans	$ 12	$ 25

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Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	23	88
Recorded Investment	$ 4,035	$ 35,020
Unpaid Principal Balance	$ 4,099	$ 56,700
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	24
Recorded Investment	$ 47	$ 30,935
Unpaid Principal Balance	$ 47	$ 52,260
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	2
Recorded Investment	$ 0	$ 716
Unpaid Principal Balance	$ 0	$ 716
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Recorded Investment	$ 984	$ 0
Unpaid Principal Balance	$ 1,031	$ 0
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	10	36
Recorded Investment	$ 2,064	$ 2,695
Unpaid Principal Balance	$ 2,064	$ 2,805
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	10	26
Recorded Investment	$ 935	$ 674
Unpaid Principal Balance	$ 949	$ 919
Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Recorded Investment	$ 5	$ 0
Unpaid Principal Balance	$ 8	$ 0

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Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	32	26
Recorded Investment | $	$ 3,628	$ 1,212
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	0
Recorded Investment | $	$ 0	$ 0
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	8	17
Recorded Investment | $	$ 2,219	$ 941
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	21	9
Recorded Investment | $	$ 1,409	$ 271

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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, 2018	Dec. 31, 2017	Jun. 30, 2018	Dec. 31, 2017
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	$ 265,880	$ 278,335
Charge offs	(27,081)	(56,246)
Recoveries	9,302	16,791
Net Charge offs	(17,779)	(39,455)
Provision for loan losses	4,500	27,000
Balance at end of period	252,601	265,880
Allowance for loan losses:
Individually evaluated			$ 32,497	$ 25,846
Collectively evaluated			220,104	240,034
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	265,880	265,880	252,601	265,880
Loans:
Individually evaluated			211,687	247,575
Collectively evaluated			22,749,199	20,537,416
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			15,900
Total loans			22,976,786	20,784,991
Commercial and industrial
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	123,068	140,126
Charge offs	(19,611)	(44,533)
Recoveries	6,406	11,465
Net Charge offs	(13,205)	(33,068)
Provision for loan losses	750	16,010
Balance at end of period	110,613	123,068
Allowance for loan losses:
Individually evaluated			17,628	10,838
Collectively evaluated			92,985	112,230
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	110,613	140,126	110,613	123,068
Loans:
Individually evaluated			110,993	142,244
Collectively evaluated			6,996,038	6,257,449
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			2,765
Total loans			7,109,796	6,399,693
Commercial real estate — owner occupied
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	10,352	14,034
Charge offs	(1,042)	(344)
Recoveries	287	173
Net Charge offs	(755)	(171)
Provision for loan losses	1,213	(3,511)
Balance at end of period	10,810	10,352
Allowance for loan losses:
Individually evaluated			829	2,973
Collectively evaluated			9,981	7,379
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	10,810	14,034	10,810	10,352
Loans:
Individually evaluated			20,255	26,234
Collectively evaluated			866,356	775,975
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			1,719
Total loans			888,330	802,209
Commercial real estate — investor
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	41,059	45,285
Charge offs	(1,202)	(991)
Recoveries	21	242
Net Charge offs	(1,181)	(749)
Provision for loan losses	4,272	(3,477)
Balance at end of period	44,150	41,059
Allowance for loan losses:
Individually evaluated			4,132	1,597
Collectively evaluated			40,018	39,462
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	41,059	41,059	44,150	41,059
Loans:
Individually evaluated			16,381	19,118
Collectively evaluated			3,969,829	3,296,136
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			10,205
Total loans			3,996,415	3,315,254
Real estate construction
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	34,370	26,932
Charge offs	(53)	(604)
Recoveries	290	74
Net Charge offs	237	(530)
Provision for loan losses	(5,455)	7,968
Balance at end of period	29,152	34,370
Allowance for loan losses:
Individually evaluated			77	86
Collectively evaluated			29,075	34,284
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	29,152	26,932	29,152	34,370
Loans:
Individually evaluated			448	467
Collectively evaluated			1,486,464	1,451,217
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			247
Total loans			1,487,159	1,451,684
Residential mortgage
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	29,607	27,046
Charge offs	(956)	(2,611)
Recoveries	690	927
Net Charge offs	(266)	(1,684)
Provision for loan losses	1,796	4,245
Balance at end of period	31,137	29,607
Allowance for loan losses:
Individually evaluated			6,208	6,512
Collectively evaluated			24,929	23,095
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	31,137	27,046	31,137	29,607
Loans:
Individually evaluated			51,469	47,486
Collectively evaluated			8,154,904	7,499,048
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			880
Total loans			8,207,253	7,546,534
Home equity
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	22,126	20,364
Charge offs	(1,729)	(2,724)
Recoveries	1,192	3,194
Net Charge offs	(537)	470
Provision for loan losses	(301)	1,292
Balance at end of period	21,288	22,126
Allowance for loan losses:
Individually evaluated			3,514	3,718
Collectively evaluated			17,774	18,408
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	22,126	22,126	21,288	22,126
Loans:
Individually evaluated			11,092	10,891
Collectively evaluated			900,187	872,913
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			84
Total loans			911,363	883,804
Other consumer
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	5,298	4,548
Charge offs	(2,488)	(4,439)
Recoveries	416	716
Net Charge offs	(2,072)	(3,723)
Provision for loan losses	2,225	4,473
Balance at end of period	5,451	5,298
Allowance for loan losses:
Individually evaluated			109	122
Collectively evaluated			5,342	5,176
Allowance Attributable to Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total allowance for loan losses	$ 5,451	$ 4,548	5,451	5,298
Loans:
Individually evaluated			1,049	1,135
Collectively evaluated			375,421	384,678
Financing Receivable Acquired and Accounted under Modification of Impaired Loans			0
Total loans			$ 376,470	$ 385,813

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Loans Changes in the Allowance for Loan Losses by Oil and Gas Segment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 265,880	$ 278,335
Charge offs	(27,081)	(56,246)
Recoveries	9,302	16,791
Net Charge offs	(17,779)	(39,455)
Provision for loan losses	4,500	27,000
Balance at end of period	252,601	265,880
Allowance for loan losses
Individually evaluated			$ 32,497	$ 25,846
Collectively evaluated			220,104	240,034
Total allowance for loan losses	265,880	265,880	252,601	265,880
Loans
Individually evaluated			211,687	247,575
Collectively evaluated			22,749,199	20,537,416
Total loans			22,976,786	20,784,991
Oil and Gas Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	27,000	38,000
Charge offs	(14,000)	(25,000)
Recoveries	3,000	0
Net Charge offs	(11,000)	(25,000)
Provision for loan losses	1,000	14,000
Balance at end of period	17,000	27,000
Allowance for loan losses
Individually evaluated			9,000	5,000
Collectively evaluated			8,000	22,000
Total allowance for loan losses	$ 27,000	$ 38,000	17,000	27,000
Loans
Individually evaluated			45,000	77,000
Collectively evaluated			637,000	523,000
Total loans			$ 682,000	$ 600,000

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Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Change in the allowance for unfunded commitments
Balance at beginning of period	$ 24,000
Balance at end of period	26,000	$ 24,000
Allowance for Unfunded Commitments:
Change in the allowance for unfunded commitments
Balance at beginning of period	24,400	25,400
Provision for unfunded commitments	(500)	(1,000)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	2,436	0
Balance at end of period	$ 26,336	$ 24,400

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Loans Changes to Accretable Yield (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 0	$ 0
Purchases	4,881	0
Accretion	(119)	0
Balance at end of period	$ 4,762	$ 0

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Loans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 4,035	$ 35,020
Restructured Loans Subsequently Accruing_String	less than $1 million
Ytd Restructured Loans Still On Nonaccrual	$ 4,000	4,000
UnaccretedPurchaseDiscount		32,000
UnaccretedPurchaseDiscount_PerformingLoans	26,000	26,000
UnaccretedPurchaseDiscount_NonPerformingLoans	7,000	7,000
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	252,601	252,601		$ 265,880	$ 278,335
Oil and Gas Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 17,000	$ 17,000		$ 27,000	$ 38,000
Percent of loans	2.50%	2.50%
Bank Mutual [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Net of Deferred Income, Purchased Credit Impaired Loans And Covered Loans	$ 16,000	$ 16,000

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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 2,168	$ 496	$ 3,693	$ 1,009
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	58,100		58,100		$ 4,385
Accumulated amortization	(2,421)		(2,421)		(4,385)
Net Book Value	55,679		55,679		0
Amortization of other intangible assets			2,421		112
Adjustments to Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Additions during the period			58,100		0
Other Intangible Assets
Summary of core deposit intangibles and other intangibles
Gross carrying amount	44,931		44,931		34,572
Accumulated amortization	(20,262)		(20,262)		(18,992)
Net Book Value	$ 24,668		24,668		15,580
Additions during the period			10,359		2,162
Amortization of other intangible assets			$ 1,270		$ 1,847

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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, 2018	Dec. 31, 2017
Mortgage servicing rights:
Mortgage servicing rights at beginning of period		$ 59,168	$ 62,085
MSR Addition from Business Combination		8,136	0
Additions		4,502	7,167
Amortization		(4,649)	(10,084)
Mortgage servicing rights at end of period		67,157	59,168
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period		(784)	(609)
(Additions) recoveries, net		607	(175)
Valuation allowance at end of period		(177)	(784)
Mortgage servicing rights, net		66,980	58,384
Fair value of mortgage servicing rights		84,585	64,387
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)		$ 8,500,578	$ 7,646,846
Mortgage servicing rights, net to servicing portfolio		0.79%	0.76%
Mortgage servicing rights expense	[1]	$ 4,042	$ 10,259

[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, 2018	Dec. 31, 2017
Core Deposit Intangibles
Estimated future amortization expense
Six Months Ending December 31, 2018	$ 2,905
Year ending December 31, 2019	5,810
Year ending December 31, 2020	5,810
Year ending December 31, 2021	5,810
Year ending December 31, 2022	5,810
Year ending December 31, 2023	5,810
Beyond 2023	23,724
Net Book Value	55,679	$ 0
Other Intangible Assets
Estimated future amortization expense
Six Months Ending December 31, 2018	1,563
Year ending December 31, 2019	2,828
Year ending December 31, 2020	2,711
Year ending December 31, 2021	2,687
Year ending December 31, 2022	2,663
Year ending December 31, 2023	2,644
Beyond 2023	9,571
Net Book Value	24,668	$ 15,580
Mortgage Servicing Rights
Estimated future amortization expense
Six Months Ending December 31, 2018	4,725
Year ending December 31, 2019	9,150
Year ending December 31, 2020	7,963
Year ending December 31, 2021	6,906
Year ending December 31, 2022	6,000
Year ending December 31, 2023	5,228
Beyond 2023	27,185
Net Book Value	$ 67,157

XML

Goodwill and Other Intangible Assets (Details Textuals) - USD ($)			3 Months Ended	6 Months Ended
	Jun. 01, 2018	Feb. 01, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill			$ 1,166,665,000	$ 1,166,665,000		$ 976,239,000
Goodwill, Impairment Loss				0	$ 0
Bank Mutual
Business Acquisition [Line Items]
Goodwill acquired		$ 173,000,000		173,000,000
Additions to finite-lived intangible assets			58,000,000
Diversified Insurance Solutions
Business Acquisition [Line Items]
Goodwill acquired				$ 10,000,000
Additions to finite-lived intangible assets		$ 8,000,000
Anderson Insurance Investment Agency [Domain]
Business Acquisition [Line Items]
Goodwill acquired	$ 7,000,000		7,000,000
Additions to finite-lived intangible assets	$ 3,000,000		$ 3,000,000

XML

Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Short-term Funding [Abstract]
Federal funds purchased	$ 20,720	$ 141,950
Securities sold under agreements to repurchase	183,013	182,865
Federal funds purchased and securities sold under agreements to repurchase	203,733	324,815
Commercial paper	52,791	67,467
Total short-term funding	256,525	392,282
Long-term Funding
Senior notes, at par	250,000	250,000
Subordinated notes, at par	250,000	250,000
Other long-term funding and capitalized costs	(2,381)	(2,718)
Total long-term funding	497,619	497,282
TotalShortTermLongTermExcludingFHLB	754,144	889,564
Advances from Federal Home Loan Banks [Abstract]
ShortTermFHLBAdvances	370,000	284,000
LongTermFHLBAdvances	4,427,857	2,900,168
TotalFHLB_Advances	4,797,857	3,184,168
Total short and long-term funding, excluding FHLB advances	$ 5,552,001	$ 4,073,732

XML

Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 183,013,000	$ 182,865,000
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	183,013,000	182,865,000
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	183,013,000	182,865,000
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	183,013,000	182,865,000
Agency mortgage-related securities | Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | 30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 0	$ 0

XML

Short and Long-Term Funding FHLB Maturity Schedule (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 4,797,857	$ 3,184,168
FHLB Weighted Average Coupon Rate	1.97%	1.26%
FHLB Maturity within One Year [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 2,632,613	$ 2,434,000
FHLB Weighted Average Coupon Rate	1.70%	1.26%
FHLB Maturity One Year to Two Years [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 1,861,040	$ 750,013
FHLB Weighted Average Coupon Rate	2.25%	1.23%
FHLB Maturity Over Two Years to Three Years [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 291,606	$ 155
FHLB Weighted Average Coupon Rate	2.60%	4.91%
FHLB Maturity Over Three Years [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 12,598	$ 0
FHLB Weighted Average Coupon Rate	4.55%	0.00%

XML

Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Nov. 30, 2014	Jun. 30, 2018	Dec. 31, 2017
Subordinated Borrowing [Line Items]
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed		$ 279,000
Federal Home Loan Bank, Advances, Weighted Average Interest Rate		1.97%	1.26%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 4,797,857	$ 3,184,168
FHLB Advances, Weighted Average Life		1 year 4 months 24 days
FHLB Put Contractual Maturity Weighted Average Life		6 years 7 months 6 days
Two Thousand Fourteen Senior Notes
Subordinated Borrowing [Line Items]
New Senior Debt Issued	$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Two Thousand Fourteen Subordinated Notes
Subordinated Borrowing [Line Items]
Junior Subordinated Debentures Issued	$ 250,000
Debt Instrument, Term	10 years
Subordinated Borrowing, Interest Rate	4.25%
FHLB Maturity within One Year [Domain]
Subordinated Borrowing [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 2,632,613	$ 2,434,000
FHLB, Increase in Advances [Domain]
Subordinated Borrowing [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 1,600,000

XML

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Not Designated as Hedging Instrument | Trading assets | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 2,668,542	$ 2,183,687
Derivative, Fair Value, Net	62,708	28,494
Not Designated as Hedging Instrument | Trading assets | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	143,551	124,851
Derivative, Fair Value, Net	3,317	2,495
Not Designated as Hedging Instrument | Trading assets | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	419,459	457,868
Derivative, Fair Value, Net	66,894	38,686
Not Designated as Hedging Instrument | Trading liabilities | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,668,542	2,183,687
Derivative, Fair Value, Net	(62,141)	(28,035)
Not Designated as Hedging Instrument | Trading liabilities | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	136,177	118,094
Derivative, Fair Value, Net	(3,091)	(2,339)
Not Designated as Hedging Instrument | Trading liabilities | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	419,458	457,108
Derivative, Fair Value, Net	(66,380)	(37,286)
Not Designated as Hedging Instrument | Other assets | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	335,070	222,736
Derivative, Fair Value, Net	3,287	1,538
Not Designated as Hedging Instrument | Other assets | Purchased options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	25,511	31,063
Derivative, Fair Value, Net	1,027	1,175
Not Designated as Hedging Instrument | Other liabilities | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	312,003	164,567
Derivative, Fair Value, Net	(919)	(313)
Not Designated as Hedging Instrument | Other liabilities | Written options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	25,511	31,063
Derivative, Fair Value, Net	(1,027)	(1,175)
Designated as Hedging Instrument | Other assets | interest rate product [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	500,000	0
Derivative, Fair Value, Net	$ 2,396	$ 0

XML

Derivative and Hedging Activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Balance Sheet Recording of Fair Value Hedge [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ 132,919	$ 69,675
Designated as Hedging Instrument
Balance Sheet Recording of Fair Value Hedge [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	500,000
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	2,400
Amortized cost basis of hedged asset	1,200,000
adjustment [Member] | Designated as Hedging Instrument
Balance Sheet Recording of Fair Value Hedge [Line Items]
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(2,409)
Carrying Value [Member] | Designated as Hedging Instrument
Balance Sheet Recording of Fair Value Hedge [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ 497,591

XML

Derivative and Hedging Activities Income impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (13)	$ 0
Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(2,409)	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Designated as Hedging Instrument | Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	2,396	0
Designated as Hedging Instrument | Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0	$ 0

XML

Derivative and Hedging Activities Derivative Impact on Perfomance (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Capital Market Fees [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 108	$ (69)
Capital Market Fees [Member] | Foreign Exchange Forward [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	70	9
Capital Market Fees [Member] | Commodity Contract [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(886)	198
Mortgage Banking [Member] | Interest Rate Lock Commitments [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1,749	2,474
Mortgage Banking [Member] | Forward Contracts [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (606)	$ (2,749)

XML

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 35	$ 24
Derivative collateral right to reclaim cash	$ 48	$ 22

XML

Balance Sheet Offsetting (Details) - June 30, 2018 - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 68,065	$ 29,503
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	68,065	29,503
Financial instruments	(27,040)	(16,140)
Collateral	(38,601)	(13,234)
Net amount	2,424	129
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	63,363	37,164
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	63,363	37,164
Financial instruments	(27,040)	(16,140)
Collateral	(35,513)	(20,662)
Net amount	$ 810	$ 362

XML

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
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	8,552,601	8,027,187
Commercial Letters Of Credit
Summary of lending-related and other commitments
Lending related commitments	13,167	11,886
Standby Letters of Credit
Summary of lending-related and other commitments
Lending related commitments	255,858	235,361
Standby letters of credit, fair value	$ 3,000	$ 2,000

XML

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters Residential Mortgage Repurchase Reserve (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Residential mortgage repurchase reserve
Balance at beginning of period	$ 24,000
Balance at end of period	26,000
Mortgage Repurchase Reserve
Residential mortgage repurchase reserve
Balance at beginning of period	987	$ 900
Repurchase provision expense	150	246
Charge offs, net	(90)	(159)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired	88	$ 0
Balance at end of period	$ 1,135

XML

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) $ in Millions		6 Months Ended	12 Months Ended
	May 22, 2015 USD ($) branch loan_production_office	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 06, 2017 complaint	Aug. 30, 2017 complaint	Jul. 28, 2017 complaint
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 26	$ 24
Conciliation Agreement, Commitment Term	3 years
Conciliation Agreement, Mortgage Loan Commitment	$ 196
Conciliation Agreement, Number of Branch Opening Commitments | branch	1
Conciliation Agreement, Number of Loan Production Offices, Commitment | loan_production_office	4
Loans Repurchased Under Make Whole Requests		1	$ 1
Loans Sold To Outside Investors Original Amount		$ 10,500
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid		zero	negligible
Loans Sold To Outside Investors Remaining Outstanding Amount		$ 6,200
Residential Mortgage Loans Sold With Recourse Risk		39	$ 44
Residential Mortgage Loans Sold With Credit Recourse Risk		64	73
Schumel et al v. Bank Mutual Corporation et al, and Paquin et al v. Bank Mutual Corporation et al [Domain]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Number of complaints filed under legal proceedings | complaint						2
Wollenburg et al. v. Bank Mutual Corporation et al. [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Number of complaints filed under legal proceedings | complaint					1
Parshall et al. v. Bank Mutual Corporation et al. [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Number of complaints filed under legal proceedings | complaint				1
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments		137	147
Commitments Under Unconsolidated Projects		99	119
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments		$ 25	$ 23

XML

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment securities available for sale:
Investment securities available for sale	$ 4,261,651	$ 4,043,446
Trading assets	132,919	69,675
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	131,612	67,660
Fair Value, Inputs, Level 1
Investment securities available for sale:
Investment securities available for sale	2,609	2,628
Fair Value, Inputs, Level 2
Investment securities available for sale:
Investment securities available for sale	4,259,042	4,040,818
Trading assets	136,342	70,850
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	132,639	68,835
Fair Value, Inputs, Level 3
Investment securities available for sale:
Trading assets	3,287	1,538
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	919	313
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities
Investment securities available for sale:
Investment securities available for sale	996	996
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	1,613	1,632
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	2,609	2,628
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Investment securities available for sale:
Investment securities available for sale	396,709	464,768
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA
Investment securities available for sale:
Investment securities available for sale	2,210,189	1,913,350
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private Label
Investment securities available for sale:
Investment securities available for sale	1,031	1,059
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA Commercial Mortgage-Related Securities
Investment securities available for sale:
Investment securities available for sale	1,348,282	1,513,277
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Investment securities available for sale:
Investment securities available for sale	299,831	145,176
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	3,000	3,188
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale
Investment securities available for sale:
Investment securities available for sale	4,259,042	4,040,818
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Loans Held For Sale Member
Investment securities available for sale:
Trading assets	143,022	85,544
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror
Investment securities available for sale:
Trading assets	62,708	28,494
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	62,141	28,035
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Investment securities available for sale:
Trading assets	3,317	2,495
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	3,091	2,339
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Investment securities available for sale:
Trading assets	66,894	38,686
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	66,380	37,286
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)
Investment securities available for sale:
Trading assets	1,027	1,175
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,027	1,175
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage)
Investment securities available for sale:
Trading assets	3,287	1,538
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	919	313
Designated as Hedging Instrument
Investment securities available for sale:
Trading assets	500,000
Designated as Hedging Instrument | Fair Value, Inputs, Level 2
Investment securities available for sale:
Interest Rate Fair Value Hedge Derivative at Fair Value, Net	$ 2,396	$ 0

XML

Fair Value Measurements - Financial Instruments Classified Within Level 3 (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Total investment securities available for sale
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 0	$ 200
Ending Balance	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Mortgage derivative loss	0	0
Total investment securities available for sale | Fair Value, Measurements, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfer of level 3 to level 2 based on new pricing information		200
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Transfer out of level 3 securities		(200)
Derivative Financial Instruments
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	1,225	3,114
Mortgage derivative loss	1,147	(1,889)
Ending Balance	$ 2,372	1,225
Derivative Financial Instruments | Fair Value, Measurements, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfer of level 3 to level 2 based on new pricing information		0
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Transfer out of level 3 securities		$ 0
Investment security
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfer of level 3 to level 2 based on new pricing information			$ 200
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Transfer out of level 3 securities			$ (200)

XML

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, 2018	Jun. 30, 2017	Dec. 31, 2017
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 66,980		$ 58,384
Mortgage Servicing Rights (MSR) Impairment (Recovery)	(607)	$ 275
Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Residential Held-for-sale, Fair Value Disclosure	143,022		85,544
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Other Real Estate Owned Fair Value Disclosure	1,954		2,604
Foreclosure / OREO expense, net	(808)		(939)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Impaired loans	52,972		92,534
Provision for Credit Losses, Impaired Loans	12,431		32,159
Mortgage servicing rights	84,585		64,387
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ 607		$ (175)

XML

Fair Value Measurements Fair Value Unobservable Level 3 Measurements (Details) - Fair Value, Inputs, Level 3	6 Months Ended
	Jun. 30, 2018
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	9.00%
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	24.00%

XML

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financial assets
Cash and due from banks	$ 396,761	$ 483,666
Interest-bearing deposits in other financial institutions	71,462	199,702
Federal funds sold and securities purchased under agreements to resell	3,150	32,650
Debt Securities, Held-to-maturity	2,602,247	2,282,853
Investment securities held to maturity, fair value	2,560,943	2,283,574
Investment securities available for sale	4,261,651	4,043,446
FHLB and Federal Reserve Bank stocks	249,040	165,331
Loans, net	22,724,184	20,519,111
Bank and Corporate Owned Life Insurance	659,592	591,057
Derivatives (trading and other assets)	132,919	69,675
Financial liabilities
Short-term funding	256,525	392,282
Other long-term funding	497,619	497,282
Derivatives (trading and other liabilities)	131,612	67,660
Letters of Credit Outstanding, Amount	256,000	235,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	396,761	483,666
Cash and due from banks, Fair Value	396,761	483,666
Interest-bearing deposits in other financial institutions	71,462	199,702
Interest-bearing deposits in other financial institutions, fair value	71,462	199,702
Federal funds sold and securities purchased under agreements to resell	3,150	32,650
Federal funds sold and securities purchased under agreements to resell, fair value	3,150	32,650
Investment securities available for sale	2,609	2,628
Investment securities available for sale, fair value	2,609	2,628
Fair Value, Inputs, Level 2
Financial assets
Debt Securities, Held-to-maturity	2,602,247	2,282,853
Investment securities held to maturity, fair value	2,560,943	2,283,574
Investment securities available for sale	4,259,042	4,040,818
Investment securities available for sale, fair value	4,259,042	4,040,818
FHLB and Federal Reserve Bank stocks	249,040	165,331
FHLB and Federal Reserve Bank stocks, fair value	249,040	165,331
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	143,022	85,544
Residential Held-for-sale, Fair Value Disclosure	143,022	85,544
Bank and Corporate Owned Life Insurance	659,592	591,057
Bank owned life insurance, fair value	659,592	591,057
Derivatives (trading and other assets)	136,342	70,850
Derivatives (trading and other assets), fair value	136,342	70,850
Financial liabilities
Brokered CDs and other time deposits	2,727,776	2,349,069
Brokered CDs and other time deposits, fair value	2,727,776	2,349,069
Short-term funding	626,525	676,282
Short-term funding, fair value	626,525	676,282
Other long-term funding	4,925,476	3,397,450
Long-term funding, fair value	4,921,348	3,411,368
Standby letters of credit	2,549	2,402
Standby letters of credit, fair value	2,549	2,402
Derivatives (trading and other liabilities)	132,639	68,835
Derivatives (trading and other liabilities), fair value	132,639	68,835
Fair Value, Inputs, Level 3
Financial assets
Loans, net	22,724,184	20,519,111
Loans, net, fair value	22,282,282	20,314,984
Derivatives (trading and other assets)	3,287	1,538
Derivatives (trading and other assets), fair value	3,287	1,538
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	21,088,538	20,436,893
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	21,088,538	20,436,893
Derivatives (trading and other liabilities)	919	313
Derivatives (trading and other liabilities), fair value	$ 919	$ 313

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Fair Value Measurements (Details Textuals)	6 Months Ended
	Jun. 30, 2018
Fair Value of Assets and Liabilities [Line Items]
Closing ratio	85.00%

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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
RAP
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,893	$ 1,782	$ 3,785	$ 3,563
Interest cost	1,660	1,756	3,320	3,512
Expected return on plan assets	(4,755)	(4,882)	(9,510)	(9,763)
Amortization of prior service cost	(19)	(18)	(38)	(37)
Amortization of actuarial loss	463	487	925	975
Total net pension and periodic benefit cost	(759)	(875)	(1,518)	(1,750)
Other Pension Plan [Member]
Net period benefit cost for the pension and postretirement plans
Interest cost	650		1,083
Expected return on plan assets	(1,060)		(1,592)
Total net pension and periodic benefit cost	(410)		(509)
Postretirement Plan(b)
Net period benefit cost for the pension and postretirement plans
Interest cost	27	24	53	48
Amortization of prior service cost	(19)	(19)	(38)	(38)
Amortization of actuarial loss	2	0	4	0
Total net pension and periodic benefit cost	$ 10	$ 5	$ 19	$ 10

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Retirement Plans (Details Textuals) (Details) $ in Millions	Jun. 30, 2018 USD ($)
Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
OneTimePensionPlanContribution	$ 31

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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Income Statement Data Abstract
Net interest income	$ 226,362	$ 183,819	$ 436,233	$ 364,093
Noninterest income	92,842	82,410	183,222	162,241
Total revenue	319,204	266,229	619,455	526,334
Credit provision	4,000	12,000	4,000	21,000
Noninterest expense	211,258	176,316	424,223	350,007
Income (loss) before income taxes	103,947	77,913	191,232	155,327
Income tax expense (benefit)	14,754	19,930	32,583	41,074
Net income	$ 89,192	$ 57,983	$ 158,648	$ 114,253
Return on average allocated capital (ROCET1)	14.00%	10.60%	12.70%	10.60%
Segment Balance Sheet Data
Average earning assets	$ 30,412,705	$ 26,744,555	$ 29,850,541	$ 26,543,054
Average loans	23,005,428	20,521,990	22,544,539	20,298,599
Average deposits	23,646,250	21,523,149	23,648,560	21,494,594
Average allocated capital (CET1)	2,488,501	2,099,825	2,439,489	2,080,892
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	107,330	89,871	203,287	179,259
Noninterest income	14,194	12,497	26,876	24,490
Total revenue	121,524	102,368	230,163	203,749
Credit provision	11,126	11,470	21,723	23,050
Noninterest expense	41,775	39,418	81,025	76,897
Income (loss) before income taxes	68,623	51,480	127,415	103,802
Income tax expense (benefit)	13,454	16,363	24,880	34,012
Net income	$ 55,169	$ 35,117	$ 102,535	$ 69,790
Return on average allocated capital (ROCET1)	17.90%	12.50%	17.20%	12.60%
Segment Balance Sheet Data
Average earning assets	$ 12,066,538	$ 10,853,881	$ 11,729,745	$ 10,807,106
Average loans	12,054,347	10,841,858	11,718,236	10,797,831
Average deposits	7,621,977	6,447,190	7,838,409	6,433,870
Average allocated capital (CET1)	1,236,918	1,125,494	1,204,160	1,120,082
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	114,620	90,131	218,163	179,059
Noninterest income	76,250	65,809	150,286	130,679
Total revenue	190,870	155,940	368,449	309,738
Credit provision	4,880	5,764	9,846	10,271
Noninterest expense	138,553	125,242	265,700	241,339
Income (loss) before income taxes	47,437	24,934	92,904	58,128
Income tax expense (benefit)	9,962	8,727	19,510	20,345
Net income	$ 37,475	$ 16,207	$ 73,394	$ 37,783
Return on average allocated capital (ROCET1)	22.70%	11.00%	22.80%	13.10%
Segment Balance Sheet Data
Average earning assets	$ 10,402,680	$ 9,510,571	$ 10,271,021	$ 9,321,564
Average loans	10,399,458	9,508,683	10,267,066	9,319,719
Average deposits	13,736,251	11,574,028	13,418,283	11,456,200
Average allocated capital (CET1)	663,172	588,880	648,032	582,706
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	4,413	3,817	14,783	5,775
Noninterest income	2,399	4,104	6,059	7,072
Total revenue	6,812	7,921	20,842	12,847
Credit provision	(12,006)	(5,234)	(27,569)	(12,321)
Noninterest expense	30,929	11,656	77,498	31,771
Income (loss) before income taxes	(12,111)	1,499	(29,087)	(6,603)
Income tax expense (benefit)	(8,661)	(5,160)	(11,806)	(13,283)
Net income	$ (3,450)	$ 6,659	$ (17,280)	$ 6,680
Return on average allocated capital (ROCET1)	(3.90%)	4.50%	(7.50%)	1.10%
Segment Balance Sheet Data
Average earning assets	$ 7,943,487	$ 6,380,103	$ 7,849,775	$ 6,414,384
Average loans	551,624	171,449	559,238	181,049
Average deposits	2,288,021	3,501,931	2,391,868	3,604,524
Average allocated capital (CET1)	$ 588,411	$ 385,451	$ 587,297	$ 378,104

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (62,758)
Debt Securities, Available-for-sale, Realized Loss			2,015	$ 0
Personnel expense	$ 123,980	$ 107,066	241,665	213,848
Change in Equity Securities(2016-01)			84
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	335	1,548	632	2,575
Total other comprehensive income (loss)	(12,215)	2,874	(57,130)	1,209
Ending Balance	(119,888)		(119,888)
Investment Securities Available For Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(78,453)	(22,023)	(38,453)	(20,079)
Other comprehensive income (loss) before reclassifications	(18,919)	5,744	(60,754)	3,632
Debt Securities, Available-for-sale, Realized Loss	2,015
Personnel expense	0	0	0	0
Other Expenses	0	0	0	0
Change in Equity Securities(2016-01)			(84)
Reporting Comprehensive Income(2018-02)			(8,419)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(335)	(1,548)	(632)	(2,575)
Income tax (expense) benefit	4,705	(1,601)	15,340	(406)
Total other comprehensive income (loss)	(12,533)	2,595	(52,533)	651
Ending Balance	(90,986)	(19,428)	(90,986)	(19,428)
Defined Benefit Pension and Post Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(29,220)	(34,321)	(24,305)	(34,600)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Debt Securities, Available-for-sale, Realized Loss	0
Personnel expense	(38)	(37)	(76)	(75)
Other Expenses	465	487	929	975
Change in Equity Securities(2016-01)			0
Reporting Comprehensive Income(2018-02)			(5,235)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	0	0	0	0
Income tax (expense) benefit	(109)	(171)	(216)	(342)
Total other comprehensive income (loss)	318	279	(4,597)	558
Ending Balance	(28,902)	(34,042)	(28,902)	(34,042)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(107,673)	(56,344)	(62,758)	(54,679)
Other comprehensive income (loss) before reclassifications	(18,919)	5,744	(60,754)	3,632
Debt Securities, Available-for-sale, Realized Loss	2,015
Personnel expense	(38)	(37)	(76)	(75)
Other Expenses	465	487	929	975
Change in Equity Securities(2016-01)			(84)
Reporting Comprehensive Income(2018-02)	(13,654)		(13,654)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	(335)	(1,548)	(632)	(2,575)
Income tax (expense) benefit	4,596	(1,772)	15,124	(748)
Total other comprehensive income (loss)	12,215	2,874	(57,130)	1,209
Ending Balance	$ (119,888)	$ (53,470)	$ (119,888)	$ (53,470)

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Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	$ 72,825	$ 65,014	$ 145,553	$ 129,896
Noninterest Income (out-of-scope of Topic 606)	20,017	17,395	37,670	32,344
Total noninterest income	92,842	82,410	183,222	162,241
Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	23,996	20,853	46,644	42,473
Deposit Account [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	16,390	16,030	32,810	32,386
Card-Based and No Loan Fees [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	10,562	9,154	20,432	17,575
Fiduciary and Trust [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	13,437	12,346	26,806	24,281
Brokerage commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	6,896	4,346	14,169	8,679
Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	1,545	2,286	4,692	4,502
Corporate and Commercial Specialty
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	3,320	4,426	8,515	9,184
Noninterest Income (out-of-scope of Topic 606)	10,874	8,071	18,361	15,306
Corporate and Commercial Specialty | Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	0	0	0	0
Corporate and Commercial Specialty | Deposit Account [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	3,786	4,070	8,011	8,511
Corporate and Commercial Specialty | Card-Based and No Loan Fees [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	358	320	674	592
Corporate and Commercial Specialty | Fiduciary and Trust [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	0	0	0	0
Corporate and Commercial Specialty | Brokerage commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	0	0	0	0
Corporate and Commercial Specialty | Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	(825)	37	(170)	82
Community, Consumer, and Business
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	69,349	60,507	136,547	120,547
Noninterest Income (out-of-scope of Topic 606)	6,901	5,302	13,739	10,132
Community, Consumer, and Business | Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	23,988	20,853	46,612	42,473
Community, Consumer, and Business | Deposit Account [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	12,590	11,938	24,773	23,826
Community, Consumer, and Business | Card-Based and No Loan Fees [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	10,162	8,829	19,691	16,973
Community, Consumer, and Business | Fiduciary and Trust [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	13,437	12,346	26,806	24,281
Community, Consumer, and Business | Brokerage commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	6,870	4,346	13,902	8,679
Community, Consumer, and Business | Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	2,302	2,196	4,763	4,315
Risk Management and Shared Services
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	156	81	490	165
Noninterest Income (out-of-scope of Topic 606)	2,242	4,022	5,570	6,906
Risk Management and Shared Services | Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	7	0	32	0
Risk Management and Shared Services | Deposit Account [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	13	23	25	49
Risk Management and Shared Services | Card-Based and No Loan Fees [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	42	5	67	11
Risk Management and Shared Services | Fiduciary and Trust [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	0	0	0	0
Risk Management and Shared Services | Brokerage commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	26	0	267	0
Risk Management and Shared Services | Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income (in-scope of Topic 606)	$ 68	$ 53	$ 98	$ 105