Associated Banc-Corp (ASB) 10-Q 30 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - $ / shares	3 Months Ended
	Mar. 31, 2019	Apr. 26, 2019	Dec. 31, 2018
Document And Entity Information [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
Trading Symbol	ASB
Entity Registrant Name	ASSOCIATED BANC-CORP
Entity Central Index Key	0000007789
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		163,903,692

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 334,095	$ 507,187
Interest-bearing deposits in other financial institutions	270,843	221,226
Federal funds sold and securities purchased under agreements to resell	41,405	148,285
Investment securities held to maturity, at amortized cost	2,846,689	2,740,511
Investment securities available for sale, at fair value	3,829,388	3,946,941
Equity securities with readily determinable fair values	1,609	1,568
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	216,940	250,534
Residential loans held for sale	81,392	64,321
Commercial loans held for sale	15,467	14,943
Loans	23,148,359	22,940,429
Allowance for loan losses	(235,081)	(238,023)
Loans, net	22,913,278	22,702,406
Bank and corporate owned life insurance	665,976	663,203
Investment in unconsolidated subsidiaries	194,670	161,181
Trading assets	77,920	88,943
Premises and equipment, net	361,668	363,225
Goodwill	1,168,944	1,169,023
Mortgage servicing rights, net	66,626	68,193
Other intangible assets, net	73,610	75,836
Other assets	540,346	460,331
Total assets	33,700,866	33,647,859
Liabilities and Stockholders’ Equity
Noninterest-bearing demand deposits	5,334,154	5,698,530
Interest-bearing deposits	20,198,903	19,198,863
Total deposits	25,533,057	24,897,393
Federal funds purchased and securities sold under agreements to repurchase	127,098	111,651
Commercial paper	32,019	45,423
FHLB advances	2,944,769	3,574,371
Other long-term funding	796,007	795,611
Trading liabilities	77,859	87,668
Accrued expenses and other liabilities	354,188	354,855
Total liabilities	29,864,996	29,866,971
Stockholders’ Equity
Preferred equity	256,716	256,716
Common stock	1,752	1,752
Surplus	1,689,792	1,712,615
Retained earnings	2,235,824	2,181,414
Accumulated other comprehensive income (loss)	(103,375)	(124,972)
Treasury stock, at cost	(244,840)	(246,638)
Total common equity	3,579,153	3,524,171
Total stockholders’ equity	3,835,870	3,780,888
Total liabilities and stockholders’ equity	$ 33,700,866	$ 33,647,859
Preferred shares issued	264,458	264,458
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Common shares issued	175,216,409	175,216,409
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Treasury shares of common stock	10,798,082	10,775,938

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Interest Income
Interest and fees on loans		$ 258,853	$ 220,034
Interest and dividends on investment securities:
Taxable		29,053	30,104
Tax-exempt		13,816	9,217
Other interest		4,226	2,177
Total interest income		305,948	261,532
Interest Expense
Interest on deposits		62,773	33,412
Interest on Federal funds purchased and securities sold under agreements to repurchase		627	522
Interest on other short-term funding		51	60
Interest on FHLB advances		19,554	13,123
Interest on long-term funding		7,396	4,544
Total interest expense		90,401	51,661
Net interest income		215,547	209,871
Provision for credit losses		6,000	0
Net interest income after provision for credit losses		209,547	209,871
Noninterest Income
Noninterest Income In Scope of Topic 606		72,538	72,725
Capital markets, net		3,189	5,306
Mortgage banking, net		4,712	6,370
Bank and corporate owned life insurance		3,792	3,187
Asset gains (losses), net		567	(107)
Investment securities gains (losses), net		1,680	0
Other		3,260	2,492
Total noninterest income		91,202	90,380
Noninterest Expense
Personnel		120,050	117,685
Technology		19,012	17,715
Occupancy		16,472	15,357
Business development and advertising		6,636	6,693
Business development and advertising		5,668	5,556
Legal and professional		3,951	5,413
Card issuance costs		977	2,332
Loan costs		1,364	972
Foreclosure / OREO expense, net		567	723
FDIC assessment		3,750	8,250
Other intangible amortization		2,226	1,525
Other		10,366	10,140
Total noninterest expense		191,671	212,965
Income before income taxes		109,078	87,285
Income tax expense		22,392	17,829
Net income		86,686	69,456
Preferred stock dividends		3,801	2,339
Net income available to common equity		$ 82,885	$ 67,117
Earnings per common share:
Basic		$ 0.50	$ 0.41
Diluted		$ 0.50	$ 0.40
Average common shares outstanding:
Basic		163,928	163,520
Diluted		165,433	166,432
Insurance commissions and fees
Noninterest Income
Noninterest Income In Scope of Topic 606		$ 25,464	$ 22,648
Wealth management fees(a)
Noninterest Income
Noninterest Income In Scope of Topic 606	[1]	20,180	20,642
Service charges on deposit account fees
Noninterest Income
Noninterest Income In Scope of Topic 606		15,115	16,420
Card-based fees
Noninterest Income
Noninterest Income In Scope of Topic 606		9,295	9,472
Service charges and account fees		9,261	9,442
Other fee-based revenue
Noninterest Income
Noninterest Income In Scope of Topic 606		2,484	3,544
Service charges and account fees		3,983	3,980
Operating Segments [Member] | Risk Management and Shared Serivies [Member]
Interest Expense
Net interest income		11,567	19,041
Provision for credit losses		(12,518)	(15,563)
Noninterest Income
Total noninterest income		5,533	3,661
Noninterest Expense
Acquisition related costs(b)	[2]	632	20,605
Total noninterest expense		21,893	46,571
Income before income taxes		6,905	(16,977)
Income tax expense		1,947	(3,146)
Net income		$ 4,958	$ (13,831)
[1]	Includes trust, asset management, brokerage, and annuity fees.
[2]	Includes Huntington branch and Bank Mutual acquisition related costs only.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 86,686	$ 69,456
Investment securities available for sale
Net unrealized gains (losses)		30,490	(41,834)
Amortization of net unrealized gain (loss) on available for sale securities transferred to held to maturity securities		69	(297)
Reclassification adjustment for net losses (gains) realized in net income(a)	[1]	(1,680)	0
Reclassification from OCI due to change in accounting principle		0	(84)
Reclassification of certain tax effects from OCI		0	(8,419)
Income tax (expense) benefit		(7,301)	10,635
Other comprehensive income (loss) on investment securities available for sale		21,578	(40,000)
Defined benefit pension and postretirement obligations
Amortization of prior service cost		(38)	(38)
Amortization of actuarial loss (gain)		64	465
Reclassification of certain tax effects from OCI		0	(5,235)
Income tax (expense) benefit		(7)	(107)
Other comprehensive income (loss) on pension and postretirement obligations		20	(4,915)
Total other comprehensive income (loss)		21,597	(44,915)
Comprehensive income		$ 108,283	$ 24,541
[1]	Includes only available for sale securities.

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Equity	Common Stock	Surplus		Retained Earnings		AOCI Allocated to Parent [Member]	AOCI Attributable to Parent [Member]	Treasury Stock
Beginning balance at Dec. 31, 2017	$ 3,237,443	$ 159,929	$ 1,618	$ 1,338,722		$ 1,934,696			$ (62,758)	$ (134,764)
Comprehensive income:
Net income	69,456	0	0	0		69,456			0	0
Other Comprehensive Income, Other, Net of Tax	(31,177)	0	0	0		0			(31,177)	0
Other comprehensive income	(44,915)								(44,915)
Adoption of new accounting standards	(13,738)	0	0	0		0			(13,738)	0
Comprehensive income	24,541
Common stock issued:
Stock-based compensation plans, net	10,691	0	0	(7,665)	[1]	20,136	[1]		0	(1,780)	[1]
Acquisitions	481,688	0	134	390,258		0			0	91,296
Purchase of common stock returned to authorized but unissued	(26,480)	0	(11)	(26,469)		0			0	0
Purchase of treasury stock	(5,240)	0	0	0		0			0	(5,240)
Cash dividends:
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)	(25,710)	0	0	0		(25,710)			0	0
Preferred stock	(2,339)	0	0	0		(2,339)			0	0
Purchase of preferred stock	(78)	(76)	0	0		(2)			0	0
Stock-based compensation expense, net	3,675	0	0	3,675		0			0	0
Tax Act Reclassification	13,654	0	0	0		13,654			0	0
Change in accounting principle	84	0	0	0		84		$ 0	(84)	0
Other	771	0	0	0		771			0	0
Ending balance at Mar. 31, 2018	3,712,699	159,853	1,741	1,698,521		2,010,746			(107,673)	(50,488)
Beginning balance at Dec. 31, 2018	3,780,888	256,716	1,752	1,712,615		2,181,414			(124,972)	(246,638)
Comprehensive income:
Net income	86,686	0	0	0		86,686			0	0
Other comprehensive income	21,597	0	0	0		0			21,597	0
Comprehensive income	108,283
Common stock issued:
Stock-based compensation plans, net	7,045	0	0	(32,220)		0			0	39,265
Purchase of treasury stock	(37,467)	0	0	0		0			0	(37,467)
Cash dividends:
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)	(28,183)	0	0	0		(28,183)			0	0
Preferred stock	(3,801)	0	0	0		(3,801)			0	0
Stock-based compensation expense, net	9,397	0	0	9,397		0			0	0
Other	(293)	0	0	0		(293)			0	0
Ending balance at Mar. 31, 2019	$ 3,835,870	$ 256,716	$ 1,752	1,689,792		2,235,824			$ (103,375)	(244,840)
Cash dividends:
Increase Adjustment Options, RSA and RSU						$ 36,000				$ 26,000
Decrease Adjustment Options RSA and RSU				$ 10,000
[1]	(a) As previously disclosed in Associated Banc-Corp's 2018 Annual Report on Form 10-K, an adjustment was made to the March 31, 2018 stockholders' equity balances related to the grant and vesting of options, restricted stock awards, and restricted stock units awarded. This adjustment increased Retained Earnings by $36 million , decreased Surplus $10 million , and increased Treasury Stock $26 million . The reclassification had no impact on earnings, expenses, or total stockholders' equity.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Common Stock, Dividends, Per Share, Cash Paid	$ 0.17	$ 0.15

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 86,686	$ 69,456
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	6,000	0
Depreciation and amortization	14,358	12,208
Addition to (recovery of) valuation allowance on mortgage servicing rights, net	121	(474)
Amortization of mortgage servicing rights	2,693	2,324
Amortization of other intangible assets	2,226	1,525
Amortization and accretion on earning assets, funding, and other, net	6,571	2,192
Net amortization of tax credit investments	5,637	4,881
Losses (gains) on sales of investment securities, net	(1,680)	0
Asset (gains) losses, net	(567)	107
(Gain) loss on mortgage banking activities, net	(3,174)	624
Mortgage loans originated and acquired for sale	(162,521)	(197,603)
Proceeds from sales of mortgage loans held for sale	159,842	187,624
Changes in certain assets and liabilities
(Increase) decrease in interest receivable	(12,068)	(12,859)
Increase (decrease) in interest payable	(1,516)	1,206
Increase (decrease) in expense payable	(51,247)	(6,987)
Increase (decrease) in cash collateral	(41,422)	(11,085)
Net change in other assets and other liabilities	(23,541)	(10,046)
Net cash provided by operating activities	(13,602)	43,093
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(216,817)	(160,921)
Purchases of:
Available for sale securities	(120,282)	(646,444)
Held to maturity securities	(140,670)	(208,517)
Federal Home Loan Bank and Federal Reserve Bank stocks	(88,245)	(144,515)
Premises, equipment, and software, net of disposals	(13,368)	(9,892)
Proceeds from:
Sales of available for sale securities	131,122	452,867
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks	121,839	96,656
Prepayments, calls, and maturities of available for sale investment securities	135,541	158,724
Prepayments, calls, and maturities of held to maturity investment securities	43,953	58,160
Sales, prepayments, calls, and maturities of other assets	3,179	1,182
Net Change in Tax Credit Investments	(18,772)	(7,240)
Net cash (paid) received in acquisition	0	59,605
Net cash used in investing activities	(162,518)	(350,336)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	635,664	(801,310)
Net increase (decrease) in short-term funding	2,043	(25,908)
Net increase (decrease) in short-term FHLB advances	(880,000)	1,150,777
Repayment of long-term FHLB advances	(169)	(250,000)
Proceeds from long-term FHLB advances	250,633	0
Proceeds from issuance of common stock for stock-based compensation plans	7,045	10,691
Purchase of preferred shares	0	(78)
Purchase of common stock returned to authorized but unissued	0	(26,480)
Purchase of treasury stock	(37,467)	(5,240)
Cash dividends on common stock	(28,183)	(25,710)
Cash dividends on preferred stock	(3,801)	(2,339)
Net cash provided by (used in) financing activities	(54,235)	24,403
Net increase (decrease) in cash, cash equivalents, and restricted cash	(230,355)	(282,840)
Cash, cash equivalents, and restricted cash at beginning of period	876,698	716,018	$ 716,018
Cash, cash equivalents, and restricted cash at end of period	646,343	433,178	$ 876,698
Supplemental disclosures of cash flow information:
Cash paid for interest	91,521	50,286
Cash paid for income taxes	(5,760)	926
Loans and bank premises transferred to other real estate owned	2,222	2,129
Capitalized mortgage servicing rights	1,247	9,873
Loans transferred into held for sale from portfolio, net	1,074	3,012
Unsettled Trades To Purchase Securities	11,244	12,095
Acquisition
Fair value of assets acquired, including cash and cash equivalents	0	2,567,123
Fair value ascribed to goodwill and intangible assets	(79)	242,576
Fair value of liabilities assumed	0	2,809,565
Equity issued in (adjustments related to) acquisition	(79)	134
Restricted Cash and Cash Equivalents
Restricted Cash	157,248	82,341
Cash and cash equivalents	$ 489,095	$ 350,837

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
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 consolidated balance sheets and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, goodwill impairment assessment, mortgage servicing rights valuation, and income taxes. Management has evaluated subsequent events for potential recognition or disclosure.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions Pending Branch Acquisition: During the fourth quarter of 2018, the Corporation announced that Associated Bank had reached an agreement to acquire the Wisconsin branch banking operations of Huntington. Under the terms of the transaction, Associated Bank expects to acquire approximately $850 million in deposits and $134 million in loans. The Huntington branch acquisition will add a net 14 branches to our franchise. On February 15, 2019, the Corporation received regulatory approval for the acquisition. The transaction is subject to customary closing conditions, and is expected to close in June of 2019

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
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 included in the Corporation’s 2018 Annual Report on Form 10-K. There has been one change to the Corporation's significant accounting policies since December 31, 2018 , which is described below. Leases The Corporation determines if a lease is present at the inception of an agreement. Operating leases are capitalized at commencement and are discounted using the Corporation’s FHLB borrowing rate for a similar term borrowing unless the lease defines an implicit rate within the contract. For operating leases existing prior to January 1, 2019, the rate for the remaining lease term as of January 1, 2019 was used. Right-of-use assets represent the Corporation’s right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease right-of-use assets and operating lease liabilities are recognized on the lease commencement date based on the present value of lease payments over the lease term. No significant judgments or assumptions were involved in developing the estimated operating lease liabilities as the Corporation’s operating lease liabilities largely represent future rental expenses associated with operating leases and the borrowing rates are based on publicly available interest rates. The lease term includes options to extend or terminate the lease. These options to extend or terminate are assessed on a lease-by-lease basis and adjustments are made to the right-of-use asset and lease liability if the Corporation is reasonably certain that an option will be exercised and will be expensed on a straight-line basis. New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU-2018-15 Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract The FASB issued an amendment which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments in this Update require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The amendments also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendment was effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Entities should apply the amendment either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption was permitted. 1st Quarter 2019 The Corporation elected to early adopt this amendment using the prospective approach. No material impact on results of operation, financial position or liquidity. ASU 2018-09 Codification Improvements The FASB issued an amendment which affects a wide variety of Topics in the Codification. The amendments apply to all reporting entities within the scope of the affected accounting guidance. The amendments in this Update represent changes to clarify, correct errors in, or make minor improvements to the Codification. The amendments make the Codification easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. The transition and effective date guidance is based on the facts and circumstances of each amendment. Some of the amendments in this Update did not require transition guidance and were effective upon issuance of this Update. However, many of the amendments in this Update did have transition guidance with effective dates for annual periods beginning after December 15, 2018. There are some conforming amendments in this Update that have been made to recently issued guidance that is not yet effective that may require application of the transition and effective date guidance in the original Accounting Standards Update. 1st Quarter 2019 No material impact on results of operations, financial position and liquidity. ASU 2016-02 Leases (Topic 842) The FASB issued an amendment to provide transparency and comparability among organizations by recognizing lease assets and lease liabilities on the consolidated balance sheets 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 was 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 was permitted. ASU 2018-01 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. ASU 2018-11 was issued to provide entities with an additional (and optional) transition method to adopt the new leases standard under ASU 2016-02. ASU 2019-01 was issued to assist in determining the fair value of underlying asset by lessors, address the presentation to the statements of cash flows, and clarify transition disclosures related to Topic 250. 1st Quarter 2019 The Corporation has adopted this amendment utilizing a modified retrospective approach. At adoption, a right-of-use asset and corresponding lease liability were recognized on the Consolidated Balance Sheets for $52 million and $56 million, respectively. See Note 18 for expanded disclosure requirements.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 2018 (In Thousands, except per share data) Net income $ 86,686 $ 69,456 Preferred stock dividends (3,801 ) (2,339 ) Net income available to common equity $ 82,885 $ 67,117 Common shareholder dividends (28,080 ) (25,572 ) Unvested share-based payment awards (103 ) (138 ) Undistributed earnings $ 54,702 $ 41,407 Undistributed earnings allocated to common shareholders 54,410 41,225 Undistributed earnings allocated to unvested share-based payment awards 292 182 Undistributed earnings $ 54,702 $ 41,407 Basic Distributed earnings to common shareholders $ 28,080 $ 25,572 Undistributed earnings allocated to common shareholders 54,410 41,225 Total common shareholders earnings, basic $ 82,490 $ 66,797 Diluted Distributed earnings to common shareholders $ 28,080 $ 25,572 Undistributed earnings allocated to common shareholders 54,410 41,225 Total common shareholders earnings, diluted $ 82,490 $ 66,797 Weighted average common shares outstanding 163,928 163,520 Effect of dilutive common stock awards 1,505 2,038 Effect of dilutive common stock warrants — 874 Diluted weighted average common shares outstanding 165,433 166,432 Basic earnings per common share $ 0.50 $ 0.41 Diluted earnings per common share $ 0.50 $ 0.40 Anti-dilutive common stock options of approximately 3 million and 1 million for the three months ended March 31, 2019 and 2018

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2019
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, whose employment meets the definitions under the 2017 Incentive Compensation Plan, 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 0% 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 three months of 2019 and full year 2018 : 2019 2018 Dividend yield 3.30 % 2.50 % Risk-free interest rate 2.60 % 2.60 % Weighted average expected volatility 24.00 % 22.00 % Weighted average expected life 5.75 years 5.75 years Weighted average per share fair value of options $4.00 $4.47 A summary of the Corporation’s stock option activity for the three months ended March 31, 2019 is presented below: Stock Options Shares (a) Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2018 5,281 $ 19.09 6.18 $ 12,392 Granted 1,050 22.77 Exercised (355 ) 15.61 Forfeited or expired (72 ) 23.46 Outstanding at March 31, 2019 5,905 $ 19.91 6.82 $ 15,870 Options Exercisable at March 31, 2019 3,691 $ 18.01 5.51 $ 14,953 (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 three months ended March 31, 2019 , the intrinsic value of stock options exercised was approximately $2 million , compared to $5 million for the three months ended March 31, 2018 . The total fair value of stock options vested was $4 million for the three months ended March 31, 2019 and $3 million for the three months ended March 31, 2018 . The Corporation recognized compensation expense for the vesting of stock options of $1 million for both the three months ended March 31, 2019 and March 31, 2018 . Included in compensation expense for 2019 was less than $1 million of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At March 31, 2019 , 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 2023 . The Corporation also issues restricted common stock and restricted common stock units to certain key employees (collectively referred to as "restricted stock awards") under the 2017 Incentive Compensation Plan. The following table summarizes information about the Corporation’s restricted stock awards activity for the three months ended March 31, 2019 : Restricted Stock Awards Shares (a) Weighted Average Grant Date Fair Value Outstanding at December 31, 2018 1,993 $ 21.92 Granted 1,153 22.21 Vested (618 ) 20.32 Forfeited (18 ) 23.67 Outstanding at March 31, 2019 2,510 $ 22.43 (a) In thousands 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 2018 and 2019 will vest ratably over a period of three years . Service-based restricted stock awards granted during 2018 and 2019 will vest ratably over a period of four years . Expense for restricted stock awards issued of approximately $8 million was recorded for the three months ended March 31, 2019 and $3 million was recorded for the three months ended March 31, 2018 . Included in compensation expense for 2019 was approximately $2 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $33 million of unrecognized compensation costs related to restricted stock awards at March 31, 2019 , that is expected to be recognized over the remaining requisite service periods that extend through first quarter 2023 .

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2019
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 GNMA or GSEs such as FNMA and FHLMC. Obligations of state and political subdivisions (municipal securities) make up a large percentage of the portfolio as well. The amortized cost and fair values of securities available for sale and held to maturity at March 31, 2019 were as follows: March 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC $ 242,921 $ 1,607 $ (2,453 ) $ 242,074 GNMA 2,060,377 727 (23,004 ) 2,038,100 Private-label 877 1 — 878 Commercial mortgage-related securities FNMA / FHLMC 20,309 346 — 20,655 GNMA 1,291,892 402 (44,512 ) 1,247,782 FFELP asset backed securities 276,164 931 (195 ) 276,899 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 3,895,540 $ 4,013 $ (70,164 ) $ 3,829,388 Investment securities held to maturity U. S. Treasury securities $ 999 $ 8 $ — $ 1,007 Obligations of state and political subdivisions (municipal securities) 1,922,792 39,043 (1,349 ) 1,960,487 Residential mortgage-related securities FNMA / FHLMC 91,003 413 (601 ) 90,815 GNMA 339,742 1,714 (3,314 ) 338,141 GNMA commercial mortgage-related securities 492,154 7,112 (20,846 ) 478,421 Total investment securities held to maturity $ 2,846,689 $ 48,291 $ (26,109 ) $ 2,868,870 The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2018 were as follows: December 31, 2018 Amortized Gross Gross Fair Value ($ in Thousands) Investment securities available for sale U. S. Treasury securities $ 1,000 $ — $ (1 ) $ 999 Residential mortgage-related securities FNMA / FHLMC 296,296 2,466 (3,510 ) 295,252 GNMA 2,169,943 473 (41,885 ) 2,128,531 Private-label 1,007 — (4 ) 1,003 GNMA commercial mortgage-related securities 1,273,309 — (52,512 ) 1,220,797 FFELP asset backed securities 297,347 711 (698 ) 297,360 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 4,041,902 $ 3,649 $ (98,610 ) $ 3,946,941 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) $ 1,790,683 $ 8,255 $ (15,279 ) $ 1,783,659 Residential mortgage-related securities FNMA / FHLMC 92,788 169 (1,795 ) 91,162 GNMA 351,606 1,611 (8,181 ) 345,035 GNMA commercial mortgage-related securities 505,434 7,559 (22,579 ) 490,414 Total investment securities held to maturity $ 2,740,511 $ 17,593 $ (47,835 ) $ 2,710,271 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. The expected maturities of investment securities available for sale and held to maturity at March 31, 2019 are shown below: Available for Sale Held to Maturity Amortized Cost Fair Value Amortized Cost Fair Value ($ in Thousands) Due in one year or less $ 1,000 $ 1,000 $ 46,085 $ 46,262 Due after one year through five years 2,000 2,000 190,810 191,172 Due after five years through ten years — — 444,710 450,417 Due after ten years — — 1,242,186 1,273,642 Total debt securities 3,000 3,000 1,923,790 1,961,493 Residential mortgage-related securities FNMA / FHLMC 242,921 242,074 91,003 90,815 GNMA 2,060,377 2,038,100 339,742 338,141 Private-label 877 878 — — Commercial mortgage-related securities FNMA / FHLMC 20,309 20,655 — — GNMA 1,291,892 1,247,782 492,154 478,421 FFELP asset backed securities 276,164 276,899 — — Total investment securities $ 3,895,540 $ 3,829,388 $ 2,846,689 $ 2,868,870 Ratio of fair value to amortized cost 98.3 % 100.8 % The proceeds from the sale of investment securities for the three months ended March 31, 2019 and 2018 are shown below: Three Months Ended March 31, 2019 2018 ($ in Thousands) Gross gains on available for sale securities $ 1,680 $ — Gross gains on held to maturity securities — — Total gains 1,680 — Gross losses on available for sale securities — — Gross losses on held to maturity securities — — Total losses — — Investment securities gains (losses), net $ 1,680 $ — Proceeds from sales of investment securities $ 131,122 $ 452,867 During the first quarter of 2019, the Corporation sold taxable ABS, MBS, and CMO securities, with the proceeds utilized to pay down borrowings. On February 1, 2018, the date the Bank Mutual acquisition was completed, the Corporation sold Bank Mutual's entire $ 453 million securities portfolio. The Corporation originally reinvested the proceeds from the Bank Mutual securities portfolio into GNMA residential mortgage-related securities with the goal of reinvesting future cash flows into municipal securities. This strategy was completed during August 2018. Investment securities with a carrying value of approximately $3.6 billion and $3.0 billion at March 31, 2019 , and December 31, 2018 , respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law. The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2019 : Less than 12 months 12 months or more Total March 31, 2019 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC 9 $ (5 ) $ 6,468 17 $ (2,448 ) $ 172,018 $ (2,453 ) $ 178,486 GNMA 9 (1,760 ) 110,619 73 (21,245 ) 1,660,128 (23,004 ) 1,770,747 GNMA commercial mortgage-related securities — — — 92 (44,512 ) 1,197,896 (44,512 ) 1,197,896 FFELP asset backed securities 10 (195 ) 128,657 — — — (195 ) 128,657 Total 28 $ (1,959 ) $ 245,744 182 $ (68,205 ) $ 3,030,042 $ (70,164 ) $ 3,275,786 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 7 $ (13 ) $ 5,599 193 $ (1,336 ) $ 136,727 $ (1,349 ) $ 142,326 Residential mortgage-related securities FNMA / FHLMC 1 (3 ) 1,664 22 (598 ) 51,691 (601 ) 53,356 GNMA — — — 63 (3,314 ) 283,774 (3,314 ) 283,774 GNMA commercial mortgage-related securities — — — 25 (20,846 ) 478,421 (20,846 ) 478,421 Total 8 $ (16 ) $ 7,264 303 $ (26,093 ) $ 950,613 $ (26,109 ) $ 957,877 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, 2018 : Less than 12 months 12 months or more Total December 31, 2018 Number Unrealized Fair Number Unrealized Fair Unrealized Fair ($ in Thousands) Investment securities available for sale U.S. Treasury securities — $ — $ — 1 $ (1 ) $ 999 $ (1 ) $ 999 Residential mortgage-related securities FNMA / FHLMC 15 (31 ) 17,993 17 (3,479 ) 189,405 (3,510 ) 207,398 GNMA 12 (4,529 ) 452,183 79 (37,355 ) 1,598,159 (41,885 ) 2,050,342 Private-label 1 (4 ) 1,003 — — — (4 ) 1,003 GNMA commercial mortgage-related securities — — — 93 (52,512 ) 1,220,854 (52,512 ) 1,220,854 FFELP asset backed securities 13 (698 ) 142,432 — — — (698 ) 142,432 Total 41 $ (5,262 ) $ 613,612 190 $ (93,347 ) $ 3,009,417 $ (98,610 ) $ 3,623,028 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 272 $ (2,860 ) $ 313,212 752 $ (12,419 ) $ 509,374 $ (15,279 ) $ 822,586 Residential mortgage-related securities FNMA / FHLMC 13 (780 ) 57,896 22 (1,015 ) 28,888 (1,795 ) 86,784 GNMA 13 (414 ) 19,822 66 (7,767 ) 320,387 (8,181 ) 340,209 GNMA commercial mortgage-related securities — — — 25 (22,579 ) 490,414 (22,579 ) 490,414 Total 298 $ (4,053 ) $ 390,929 865 $ (43,780 ) $ 1,349,063 $ (47,835 ) $ 1,739,992 The Corporation reviews the investment securities portfolio on a quarterly basis to monitor its exposure to other-than-temporary impairment. A determination as to whether a security’s decline in fair value is other-than-temporary takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in the other-than-temporary impairment analysis include the length of time and extent to which the security has been in an unrealized loss position, changes in security ratings, financial condition and near-term prospects of the issuer, as well as security and industry specific economic conditions. Based on the Corporation’s evaluation, management does not believe any unrealized loss at March 31, 2019 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 March 31, 2019 for mortgage-related securities were less than the previous quarter due to the decrease in overall interest rates. The U.S. Treasury 3 year and 5 year rates decreased by 25 bp and 28 bp, respectively, from December 31, 2018 . 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. Equity securities with readily determinable fair values: The Corporation's portfolio of equity securities is primarily comprised of CRA Qualified Investment mutual funds. At both March 31, 2019 and December 31, 2018 , the Corporation had equity securities with readily determinable fair values of $2 million . In addition, 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 March 31, 2019 are carried at a zero cost basis. FHLB and Federal Reserve Bank stocks: The Corporation is required to maintain Federal Reserve stock and FHLB stock as a member of both the Federal Reserve System and the FHLB, and in amounts as required by these institutions. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other marketable equity securities and their fair value is equal to amortized cost. At March 31, 2019 and December 31, 2018 , the Corporation had FHLB stock of $139 million and $173 million , respectively. The Corporation had Federal Reserve Bank stock of $77 million at both March 31, 2019 and December 31, 2018

Loans

Loans	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans	Loans The period end loan composition was as follows: March 31, 2019 (a) December 31, 2018 (a) ($ in Thousands) Commercial and industrial $ 7,587,597 $ 7,398,044 Commercial real estate — owner occupied 932,393 920,443 Commercial and business lending 8,519,990 8,318,487 Commercial real estate — investor 3,809,253 3,751,554 Real estate construction 1,273,782 1,335,031 Commercial real estate lending 5,083,035 5,086,585 Total commercial 13,603,025 13,405,072 Residential mortgage 8,323,846 8,277,712 Home equity 868,886 894,473 Other consumer 352,602 363,171 Total consumer 9,545,333 9,535,357 Total loans $ 23,148,359 $ 22,940,429 (a) Includes $5 million of purchased credit-impaired loans at March 31, 2019 and December 31, 2018 . The following table presents commercial and consumer loans by credit quality indicator at March 31, 2019 : Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 7,371,790 $ 30,657 $ 111,772 $ 73,379 $ 7,587,597 Commercial real estate - owner occupied 874,152 8,422 48,929 890 932,393 Commercial and business lending 8,245,942 39,079 160,701 74,269 8,519,990 Commercial real estate - investor 3,698,679 39,184 70,613 776 3,809,253 Real estate construction 1,259,661 8,782 4,600 739 1,273,782 Commercial real estate lending 4,958,341 47,966 75,213 1,516 5,083,035 Total commercial 13,204,282 87,045 235,914 75,784 13,603,025 Residential mortgage 8,250,915 256 5,351 67,323 8,323,846 Home equity 855,603 891 91 12,300 868,886 Other consumer 351,734 719 — 149 352,602 Total consumer 9,458,252 1,866 5,443 79,772 9,545,333 Total loans $ 22,662,534 $ 88,912 $ 241,357 $ 155,556 $ 23,148,359 The following table presents commercial and consumer loans by credit quality indicator at December 31, 2018 : Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 7,162,370 $ 78,075 $ 116,578 $ 41,021 $ 7,398,044 Commercial real estate - owner occupied 854,265 6,257 55,964 3,957 920,443 Commercial and business lending 8,016,635 84,332 172,542 44,978 8,318,487 Commercial real estate - investor 3,653,642 28,479 67,481 1,952 3,751,554 Real estate construction 1,321,447 8,771 3,834 979 1,335,031 Commercial real estate lending 4,975,089 37,249 71,315 2,931 5,086,585 Total commercial 12,991,724 121,582 243,856 47,909 13,405,072 Residential mortgage 8,203,729 434 5,975 67,574 8,277,712 Home equity 880,808 1,223 103 12,339 894,473 Other consumer 362,343 749 — 79 363,171 Total consumer 9,446,881 2,406 6,078 79,992 9,535,357 Total loans $ 22,438,605 $ 123,988 $ 249,935 $ 127,901 $ 22,940,429 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 exhibiting 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 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 the Corporation will sustain some loss if the deficiencies are not corrected. Lastly, management considers a loan to be impaired when it is probable 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 commercial and consumer loan relationships in nonaccrual status or those with their terms restructured in a troubled debt restructuring meet this impaired loan definition. Commercial loans classified as special mention, potential problem, and nonaccrual are reviewed at a minimum on a quarterly basis, while pass and performing rated credits are reviewed on an annual basis or more frequently if the loan renewal is less than one year or if otherwise warranted. The following table presents loans by past due status at March 31, 2019 : Accruing Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total ($ in Thousands) Commercial and industrial $ 7,510,637 $ 2,902 $ 392 $ 287 $ 73,379 $ 7,587,597 Commercial real estate - owner occupied 925,437 6,066 — — 890 932,393 Commercial and business lending 8,436,074 8,968 392 287 74,269 8,519,990 Commercial real estate - investor 3,807,387 1,090 — — 776 3,809,253 Real estate construction 1,266,270 6,727 46 — 739 1,273,782 Commercial real estate lending 5,073,657 7,816 46 — 1,516 5,083,035 Total commercial 13,509,731 16,785 439 287 75,784 13,603,025 Residential mortgage 8,243,248 13,018 256 — 67,323 8,323,846 Home equity 850,223 5,472 891 — 12,300 868,886 Other consumer 348,158 1,389 975 1,931 149 352,602 Total consumer 9,441,629 19,879 2,123 1,931 79,772 9,545,333 Total loans $ 22,951,360 $ 36,663 $ 2,562 $ 2,218 $ 155,556 $ 23,148,359 (a) Of the total nonaccrual loans, $106 million , or 68% , were current with respect to payment at March 31, 2019 . The following table presents loans by past due status at December 31, 2018 : Accruing Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total ($ in Thousands) Commercial and industrial $ 7,356,187 $ 187 $ 338 $ 311 $ 41,021 $ 7,398,044 Commercial real estate - owner occupied 913,787 2,580 119 — 3,957 920,443 Commercial and business lending 8,269,974 2,767 457 311 44,978 8,318,487 Commercial real estate - investor 3,745,835 2,954 813 — 1,952 3,751,554 Real estate construction 1,333,722 330 — — 979 1,335,031 Commercial real estate lending 5,079,557 3,284 813 — 2,931 5,086,585 Total commercial 13,349,531 6,051 1,270 311 47,909 13,405,072 Residential mortgage 8,200,432 9,272 434 — 67,574 8,277,712 Home equity 876,085 4,826 1,223 — 12,339 894,473 Other consumer 358,970 1,401 868 1,853 79 363,171 Total consumer 9,435,487 15,499 2,525 1,853 79,992 9,535,357 Total loans $ 22,785,019 $ 21,550 $ 3,795 $ 2,165 $ 127,901 $ 22,940,429 (a) Of the total nonaccrual loans, $74 million , or 58% , were current with respect to payment at December 31, 2018 . The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $5 million of purchased credit-impaired loans, at March 31, 2019 : Recorded Unpaid Related Average Interest ($ in Thousands) Loans with a related allowance Commercial and industrial $ 44,810 $ 48,448 $ 10,876 $ 36,288 $ 317 Commercial real estate — owner occupied 2,104 2,111 50 2,122 27 Commercial and business lending 46,914 50,559 10,926 38,411 344 Commercial real estate — investor 1,700 1,799 26 792 17 Real estate construction 498 578 69 502 9 Commercial real estate lending 2,198 2,377 94 1,293 25 Total commercial 49,112 52,936 11,021 39,704 369 Residential mortgage 46,165 49,395 6,197 43,194 527 Home equity 10,792 11,815 3,348 10,015 128 Other consumer 1,158 1,161 119 1,159 — Total consumer 58,116 62,370 9,664 54,368 655 Total loans (a) $ 107,228 $ 115,307 $ 20,684 $ 94,072 $ 1,025 Loans with no related allowance Commercial and industrial $ 42,988 $ 61,425 $ — $ 15,896 $ 1,657 Commercial real estate — owner occupied 730 740 — — 3 Commercial and business lending 43,718 62,166 — 15,896 1,660 Commercial real estate — investor 635 1,805 — 1,559 — Real estate construction — — — — — Commercial real estate lending 635 1,805 — 1,559 — Total commercial 44,353 63,970 — 17,455 1,660 Residential mortgage 8,182 8,429 — 7,885 48 Home equity — — — 523 — Other consumer — — — — — Total consumer 8,182 8,429 — 8,408 48 Total loans (a) $ 52,535 $ 72,399 $ — $ 25,863 $ 1,708 Total Commercial and industrial $ 87,798 $ 109,873 $ 10,876 $ 52,184 $ 1,974 Commercial real estate — owner occupied 2,834 2,851 50 2,122 30 Commercial and business lending 90,632 112,724 10,926 54,307 2,004 Commercial real estate — investor 2,335 3,604 26 2,351 17 Real estate construction 498 578 69 502 9 Commercial real estate lending 2,833 4,182 94 2,852 25 Total commercial 93,465 116,906 11,021 57,159 2,029 Residential mortgage 54,348 57,824 6,197 51,079 574 Home equity 10,792 11,815 3,348 10,538 128 Other consumer 1,158 1,161 119 1,159 — Total consumer 66,298 70,799 9,664 62,776 703 Total loans (a) $ 159,763 $ 187,705 $ 20,684 $ 119,935 $ 2,732 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 74% of the unpaid principal balance at March 31, 2019 . The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $5 million of purchased credit-impaired loans, at December 31, 2018 : Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized ($ in Thousands) Loans with a related allowance Commercial and industrial $ 40,747 $ 42,131 $ 5,721 $ 52,461 $ 1,167 Commercial real estate — owner occupied 2,080 2,087 24 2,179 104 Commercial and business lending 42,827 44,218 5,745 54,640 1,271 Commercial real estate — investor 799 805 28 827 38 Real estate construction 510 589 75 533 32 Commercial real estate lending 1,309 1,394 103 1,360 70 Total commercial 44,136 45,612 5,848 56,000 1,341 Residential mortgage 41,691 45,149 6,023 42,687 1,789 Home equity 9,601 10,539 3,312 10,209 566 Other consumer 1,181 1,183 121 1,184 3 Total consumer 52,473 56,871 9,456 54,080 2,358 Total loans (a) $ 96,609 $ 102,483 $ 15,304 $ 110,079 $ 3,699 Loans with no related allowance Commercial and industrial $ 22,406 $ 45,024 $ — $ 21,352 $ (344 ) Commercial real estate — owner occupied 3,772 4,823 — 3,975 — Commercial and business lending 26,178 49,847 — 25,327 (344 ) Commercial real estate — investor 1,585 2,820 — 980 68 Real estate construction — — — — — Commercial real estate lending 1,585 2,820 — 980 68 Total commercial 27,763 52,667 — 26,307 (276 ) Residential mortgage 8,795 9,074 — 8,790 203 Home equity 523 542 — 530 — Other consumer — — — — — Total consumer 9,318 9,616 — 9,320 203 Total loans (a) $ 37,081 $ 62,283 $ — $ 35,627 $ (73 ) Total Commercial and industrial $ 63,153 $ 87,155 $ 5,721 $ 73,813 $ 823 Commercial real estate — owner occupied 5,852 6,910 24 6,154 104 Commercial and business lending 69,005 94,065 5,745 79,967 927 Commercial real estate — investor 2,384 3,625 28 1,807 106 Real estate construction 510 589 75 533 32 Commercial real estate lending 2,894 4,214 103 2,340 138 Total commercial 71,899 98,279 5,848 82,307 1,065 Residential mortgage 50,486 54,223 6,023 51,477 1,992 Home equity 10,124 11,081 3,312 10,739 566 Other consumer 1,181 1,183 121 1,184 3 Total consumer 61,791 66,487 9,456 63,400 2,561 Total loans (a) $ 133,690 $ 164,766 $ 15,304 $ 145,707 $ 3,626 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 72% of the unpaid principal balance at December 31, 2018 . Troubled Debt Restructurings (“Restructured Loans”) Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The Corporation had a recorded investment of approximately $5 million in loans modified in troubled debt restructurings during the three months ended March 31, 2019 , of which $1 million were in accrual status and approximately $4 million were in nonaccrual pending a sustained period of repayment. The following table presents nonaccrual and performing restructured loans by loan portfolio: March 31, 2019 December 31, 2018 Performing Restructured Loans Nonaccrual Restructured Loans (a) Performing Restructured Loans Nonaccrual Restructured Loans (a) ($ in Thousands) Commercial and industrial $ 15,443 $ 107 $ 25,478 $ 249 Commercial real estate — owner occupied 2,026 78 2,080 — Commercial real estate — investor 1,700 — 799 933 Real estate construction 311 187 311 198 Residential mortgage 18,226 21,549 16,036 22,279 Home equity 7,688 2,247 7,385 2,627 Other consumer 1,154 5 1,174 6 Total restructured loans $ 46,548 $ 24,172 $ 53,263 $ 26,292 (a) Nonaccrual restructured loans have been included within nonaccrual loans. The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio, the recorded investment and unpaid principal balance for the three months ended March 31, 2019 and 2018 : Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 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 — $ — $ — 2 $ 92 $ 92 Commercial real estate — owner occupied 1 78 78 — — — Commercial real estate — investor — — — 1 1,007 1,037 Residential mortgage 25 4,357 4,374 11 1,807 1,807 Home equity 13 293 312 17 1,044 1,060 Other consumer 1 11 11 2 8 11 Total loans modified 40 $ 4,739 $ 4,776 33 $ 3,958 $ 4,007 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-modification outstanding recorded investment. Restructured loan modifications may include payment schedule modifications, interest rate concessions, maturity date extensions, modification of note structure (A/B Note), non-reaffirmed Chapter 7 bankruptcies, principal reduction, or some combination of these concessions. During the three months ended March 31, 2019 , restructured loan modifications of commercial and industrial, commercial real estate, and real estate construction loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of home equity and residential mortgage loans primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the three months ended March 31, 2019 . The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2019 and 2018 and the recorded investment in these restructured loans as of March 31, 2019 and 2018 : Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 Number of Loans Recorded Investment Number of Loans Recorded Investment ($ in Thousands) Residential mortgage 5 $ 613 4 $ 467 Home equity 7 177 12 954 Total loans modified 12 $ 790 16 $ 1,421 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, are 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 three months ended March 31, 2019 : ($ in Thousands) Commercial and Commercial real estate - owner occupied Commercial real estate - Real estate Residential Home Other Total December 31, 2018 $ 108,835 $ 9,255 $ 40,844 $ 28,240 $ 25,595 $ 19,266 $ 5,988 $ 238,023 Charge offs (13,216 ) — — (52 ) (652 ) (254 ) (1,312 ) (15,486 ) Recoveries 5,788 1,193 31 52 195 563 222 8,044 Net Charge offs (7,428 ) 1,193 31 — (457 ) 309 (1,090 ) (7,442 ) Provision for loan losses 7,525 131 289 (1,326 ) (1,567 ) (1,639 ) 1,087 4,500 March 31, 2019 $ 108,933 $ 10,579 $ 41,164 $ 26,914 $ 23,571 $ 17,936 $ 5,984 $ 235,081 Allowance for loan losses Individually evaluated for impairment $ 10,876 $ 50 $ 26 $ 69 $ 6,197 $ 3,348 $ 119 $ 20,684 Collectively evaluated for impairment 98,057 10,529 41,138 26,845 17,373 14,588 5,866 214,396 Acquired and accounted for under ASC 310-30 (a) — — — — — — — — Total allowance for loan losses $ 108,933 $ 10,579 $ 41,164 $ 26,914 $ 23,571 $ 17,936 $ 5,984 $ 235,081 Loans Individually evaluated for impairment $ 87,798 $ 2,834 $ 2,335 $ 498 $ 54,347 $ 10,793 $ 1,158 $ 159,763 Collectively evaluated for impairment 7,496,743 928,723 3,806,635 1,273,267 8,268,834 858,044 351,443 22,983,688 Acquired and accounted for under ASC 310-30 (a) 3,057 836 283 18 664 49 — 4,907 Total loans $ 7,587,597 $ 932,393 $ 3,809,253 $ 1,273,782 $ 8,323,846 $ 868,886 $ 352,602 $ 23,148,359 (a) Loans acquired in business combinations and accounted for under ASC topic 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, 2018 , was as follows: ($ in Thousands) Commercial and Commercial real estate Commercial real estate - Real estate Residential Home Other Total December 31, 2017 $ 123,068 $ 10,352 $ 41,059 $ 34,370 $ 29,607 $ 22,126 $ 5,298 $ 265,880 Charge offs (30,837 ) (1,363 ) (7,914 ) (298 ) (1,627 ) (3,236 ) (5,261 ) (50,536 ) Recoveries 13,714 639 668 446 1,271 2,628 812 20,179 Net Charge offs (17,123 ) (724 ) (7,246 ) 149 (355 ) (608 ) (4,448 ) (30,358 ) Provision for loan losses 2,890 (373 ) 7,031 (6,279 ) (3,657 ) (2,252 ) 5,138 2,500 December 31, 2018 $ 108,835 $ 9,255 $ 40,844 $ 28,240 $ 25,595 $ 19,266 $ 5,988 $ 238,023 Allowance for loan losses Individually evaluated for impairment $ 5,721 $ 24 $ 28 $ 75 $ 6,023 $ 3,312 $ 121 $ 15,304 Collectively evaluated for impairment 103,114 9,231 40,816 28,165 19,572 15,954 5,867 222,719 Acquired and accounted for under ASC 310-30 (a) — — — — — — — — Total allowance for loan losses $ 108,835 $ 9,255 $ 40,844 $ 28,240 $ 25,595 $ 19,266 $ 5,988 $ 238,023 Loans Individually evaluated for impairment $ 63,153 $ 5,852 $ 2,384 $ 510 $ 50,486 $ 10,124 $ 1,181 $ 133,690 Collectively evaluated for impairment 7,331,898 913,708 3,748,883 1,334,500 8,226,642 884,266 361,990 22,801,887 Acquired and accounted for under ASC 310-30 (a) 2,994 883 287 21 584 83 — 4,853 Total loans $ 7,398,044 $ 920,443 $ 3,751,554 $ 1,335,031 $ 8,277,712 $ 894,473 $ 363,171 $ 22,940,429 (a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality." The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit) and is included in accrued expenses and other liabilities on the consolidated balance sheets. The following table presents a summary of the changes in the allowance for unfunded commitments: Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Allowance for Unfunded Commitments Balance at beginning of period $ 24,336 $ 24,400 Provision for unfunded commitments 1,500 (2,500 ) Amount recorded at acquisition — 2,436 Balance at end of period $ 25,836 $ 24,336 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 three months ended March 31, 2019 and for the year ended December 31, 2018 : Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Changes in Accretable Yield Balance at beginning of period $ 1,482 $ — Purchases — 4,853 Accretion (221 ) (4,954 ) Net reclassification from non-accretable yield 23 1,605 Other (a) — (22 ) Balance at end of period $ 1,285 $ 1,482 (a) Primarily includes charge-offs which are accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality." 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 March 31, 2019 , the Corporation had a total of approximately $18 million in net unaccreted purchase discount, of which approximately $16 million was related to performing loans and approximately $2 million

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other 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 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 2018 or the first three months of 2019 . At both March 31, 2019 and December 31, 2018 , the Corporation had goodwill of $1.2 billion . Other Intangible Assets The Corporation has other intangible assets that are amortized, consisting of CDI, other intangibles (primarily related to customer relationships acquired in connection with the Corporation’s insurance agency acquisitions), and mortgage servicing rights. For CDI and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Core deposit intangibles Gross carrying amount $ 58,100 $ 58,100 Accumulated amortization (6,778 ) (5,326 ) Net book value $ 51,322 $ 52,774 Additions during the periods $ — $ 58,100 Amortization during the year $ 1,453 $ 5,326 Other intangibles Gross carrying amount $ 44,887 $ 44,931 Reductions due to sale — (43 ) Accumulated amortization (22,599 ) (21,825 ) Net book value $ 22,288 $ 23,062 Additions during the period $ — $ 10,359 Amortization during the year $ 774 $ 2,833 Mortgage Servicing Rights The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. MSR 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 is as follows: Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Mortgage servicing rights Mortgage servicing rights at beginning of period $ 68,433 $ 59,168 Additions from acquisition — 8,136 Additions 1,247 10,722 Amortization (2,693 ) (9,594 ) Mortgage servicing rights at end of period $ 66,987 $ 68,433 Valuation allowance at beginning of period (239 ) (784 ) (Additions) recoveries, net (121 ) 545 Valuation allowance at end of period (360 ) (239 ) Mortgage servicing rights, net $ 66,626 $ 68,193 Fair value of mortgage servicing rights $ 73,858 $ 81,012 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 8,543,467 $ 8,600,983 Mortgage servicing rights, net to servicing portfolio 0.78 % 0.79 % Mortgage servicing rights expense (a) $ 2,814 $ 9,049 (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 projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2019 . 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. The following table shows the estimated future amortization expense for amortizing intangible assets: Estimated Amortization Expense Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights ($ in Thousands) Nine Months Ending December 31, 2019 $ 4,358 $ 2,050 $ 7,983 2020 5,810 2,707 11,032 2021 5,810 2,682 9,334 2022 5,810 2,659 7,848 2023 5,810 2,640 6,579 2024 5,810 2,620 5,507 Beyond 2024 17,914 6,931 18,703 Total Estimated Amortization Expense $ 51,322 $ 22,288 $ 66,987

Short and Long-Term Funding

Short and Long-Term Funding	3 Months Ended
	Mar. 31, 2019
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): March 31, 2019 December 31, 2018 ($ in Thousands) Short-Term Funding Federal funds purchased $ 13,090 $ 19,710 Securities sold under agreements to repurchase 114,008 91,941 Federal funds purchased and securities sold under agreements to repurchase 127,098 111,651 Commercial paper 32,019 45,423 Total short-term funding $ 159,117 $ 157,074 Long-Term Funding Corporation senior notes, at par, due 2019 $ 250,000 $ 250,000 Bank senior notes, at par, due 2021 300,000 300,000 Corporation subordinated notes, at par, due 2025 250,000 250,000 Other long-term funding and capitalized costs (3,993 ) (4,389 ) Total long-term funding 796,007 795,611 Total short and long-term funding, excluding FHLB advances $ 955,123 $ 952,685 FHLB Advances Short-term FHLB advances $ 20,000 $ 900,000 Long-term FHLB advances 2,924,769 2,674,371 Total FHLB advances $ 2,944,769 $ 3,574,371 Total short and long-term funding $ 3,899,893 $ 4,527,056 Securities Sold Under Agreements to Repurchase ("Repurchase Agreements") The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). See Note 11 for additional disclosures on balance sheet offsetting. The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of March 31, 2019 , the Corporation pledged agency mortgage-related securities with a fair value of $171 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of March 31, 2019 and December 31, 2018 are presented in the following table: Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total ($ in Thousands) March 31, 2019 Repurchase agreements Agency mortgage-related securities $ 114,008 $ — $ — $ — $ 114,008 Total $ 114,008 $ — $ — $ — $ 114,008 December 31, 2018 Repurchase agreements Agency mortgage-related securities $ 91,941 $ — $ — $ — $ 91,941 Total $ 91,941 $ — $ — $ — $ 91,941 Long-Term Funding Senior Notes In August 2018, Associated Bank, N.A. issued $300 million of senior notes, due August 2021, and callable July 2021. The senior notes have a fixed coupon interest rate of 3.50% and were issued at a discount. 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 March 31, 2019 , the Corporation had $2.9 billion of FHLB advances, down $ 630 million from December 31, 2018 . As of March 31, 2019 , the Corporation had $ 2.8 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 0.69 year s, with put dates ranging from 2019 through 2020. The weighted average life to contractual maturity on these advances was 7.08 years, with those dates ranging from 2023 through 2028. As of March 31, 2019 , 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 March 31, 2019 and December 31, 2018 are presented in the following table: March 31, 2019 December 31, 2018 Amount Weighted Average Contractual Coupon Rate Amount Weighted Average Contractual Coupon Rate ($ in Thousands) Maturity or put date 1 year or less $ 2,232,703 2.79 % $ 2,262,584 2.06 % After 1 but within 2 688,035 2.43 % 1,285,039 2.39 % After 2 but within 3 16,064 3.22 % 14,393 2.98 % After 3 years 7,968 3.78 % 12,354 4.55 % FHLB advances and overall rate $ 2,944,769 2.71 % $ 3,574,371 2.19 %

Derivative and Hedging Activiti

Derivative and Hedging Activities	3 Months Ended
	Mar. 31, 2019
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 Corporation 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. Federal regulations require the Corporation to clear all LIBOR interest rate swaps through a clearing house ("centrally cleared"), if possible. Securities are often pledged as collateral for centrally cleared interest rate swaps and derivatives. The Corporation pledged $35 million of investment securities as collateral at March 31, 2019 , and pledged $36 million of investment securities as collateral at December 31, 2018 . Cash is often pledged as collateral for interest rate swaps and derivatives that are not centrally cleared. At March 31, 2019 , the Corporation posted $32 million of cash collateral for the margin compared to $1 million at December 31, 2018 . 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 consolidated balance sheets 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 consolidated balance sheets category and fair values of the Corporation’s derivative instruments: March 31, 2019 December 31, 2018 ($ in Thousands) Notional Amount Fair Consolidated Notional Amount Fair Consolidated Derivatives not designated as hedging instruments Interest rate-related instruments — customer and mirror $ 2,726,738 $ 54,479 Trading assets $ 2,707,204 $ 52,796 Trading assets Interest rate-related instruments — customer and mirror 2,726,738 (55,008 ) Trading liabilities 2,707,204 (52,653 ) Trading liabilities Foreign currency exchange forwards 92,285 1,737 Trading assets 117,879 721 Trading assets Foreign currency exchange forwards 103,238 (1,665 ) Trading liabilities 69,153 (675 ) Trading liabilities Commodity contracts 284,655 21,705 Trading assets 331,727 35,426 Trading assets Commodity contracts 284,656 (21,186 ) Trading liabilities 315,861 (34,340 ) Trading liabilities Interest rate lock commitments (mortgage) 269,075 3,032 Other assets 191,222 2,208 Other assets Forward commitments (mortgage) 191,112 (1,825 ) Other liabilities 139,984 (2,072 ) Other liabilities Purchased options (time deposit) 7,885 156 Other assets 11,185 109 Other assets Written options (time deposit) 7,885 (156 ) Other liabilities 11,185 (109 ) Other liabilities Derivatives designated as hedging instruments Interest Rate Products 500,000 (128 ) Other liabilities 500,000 (40 ) Other liabilities The following table presents amounts that were recorded on the consolidated balance sheets 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) March 31, 2019 Loans and investment securities receivables (a) $ 501,555 $ 1,555 Total $ 501,555 $ 1,555 (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 March 31, 2019 , the amortized cost basis of the closed portfolios used in these hedging relationships was $1.1 billion ; the positive cumulative basis adjustments associated with these hedging relationships was $2 million; and the amounts of the designated hedged items were $500 million . The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income during the three months ended March 31, 2019 and twelve months ended December 31, 2018 : Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Total amounts of income and expense line items presented in the consolidated statements of income in which the effects of fair value or cash flow hedges are recorded $ 166 $ — $ (1,325 ) $ — 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 2,057 — (502 ) — Derivatives designated as hedging instruments (a) (1,891 ) — (823 ) — (a) Includes net settlements on the derivatives. The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income during the three months ended March 31, 2019 and 2018 : Consolidated Statements of Income Category of Gain / (Loss) Recognized in Income For the Three Months Ended March 31, ($ in Thousands) 2019 2018 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ (672 ) $ 492 Foreign currency exchange forwards Capital markets, net 26 (28 ) Commodity contracts Capital markets, net (567 ) 164 Interest rate lock commitments (mortgage) Mortgage banking, net 824 1,494 Forward commitments (mortgage) Mortgage banking, net 247 10

Balance Sheet Offsetting

Balance Sheet Offsetting	3 Months Ended
	Mar. 31, 2019
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 create single net settlements 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 are therefore excluded from this table: Gross amounts of recognized assets Gross amounts not offset in the consolidated balance sheets ($ 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) March 31, 2019 $ 25,486 $ — $ 25,486 $ (24,210 ) $ (1,044 ) $ 232 December 31, 2018 65,596 — 65,596 (22,873 ) (41,879 ) 843 Gross amounts of recognized liabilities Gross amounts not offset ($ 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) March 31, 2019 $ 52,768 $ — $ 52,768 $ (24,210 ) $ (25,889 ) $ 2,669 December 31, 2018 22,951 — 22,951 (22,873 ) (63 ) 16 (a) Includes interest and commodity instrument assets. (b) Includes interest and commodity instrument liabilities.

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	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: March 31, 2019 December 31, 2018 ($ in Thousands) Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 8,687,001 $ 8,720,293 Commercial letters of credit (a) 6,192 7,599 Standby letters of credit (c) 256,389 255,904 (a) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at March 31, 2019 or December 31, 2018 . (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10 . (c) The Corporation has established a liability of $2 million at both March 31, 2019 and December 31, 2018 , 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 March 31, 2019 and $24 million at December 31, 2018 , 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 qualified affordable housing projects, federal and state historic projects, and new market projects for the purpose of community reinvestment and obtaining tax credits and other tax benefits. Return on the Corporation's investment in these projects comes in the form of the tax credits and tax losses that pass through to the Corporation. The aggregate carrying value of these investments at March 31, 2019 was $169 million , compared to $136 million at December 31, 2018 , included in investment in unconsolidated subsidiaries on the consolidated balance sheets. The Corporation utilizes the proportional amortization method to account for investments in qualified affordable housing projects. Under the proportional amortization method, the Corporation amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits. The Corporation recognized additional income tax expense attributable to the amortization of investments in qualified affordable housing projects of $5 million for both the three months ended March 31, 2019 and 2018 . The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $160 million at March 31, 2019 and $132 million at December 31, 2018 . The Corporation’s unfunded equity contributions relating to investments in qualified affordable housing, federal and state historic projects, and new market projects are recorded in accrued expenses and other liabilities on the consolidated balance sheets. The Corporation’s remaining unfunded equity contributions totaled $73 million and $51 million at March 31, 2019 and December 31, 2018 , respectively. For the three months ended March 31, 2019 and the year ended December 31, 2018 , the Corporation did not record any impairment related to qualified affordable housing investments. 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 was $25 million at both March 31, 2019 and December 31, 2018 , included in investment in unconsolidated subsidiaries on the consolidated balance sheets. 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. The Corporation does not believe it is presently subject to any legal proceedings the resolution of which would have a material adverse effect on our business, financial condition, operating results or cash flows. Regulatory Matters 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 $305 thousand during the three months ended March 31, 2019 and $2 million for the year ended December 31, 2018 . The loss reimbursement and settlement claims paid for the three months ended March 31, 2019 and for the year ended December 31, 2018 were negligible . Make whole requests during 2018 and the first three months of 2019 generally arose from loans sold during the period of January 1, 2012 to December 31, 2018 . Since January 1, 2012, loans sold totaled $11.3 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2019 , approximately $7.3 billion of these sold loans remain outstanding. The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The following summarizes the changes in the mortgage repurchase reserve for the three months ended March 31, 2019 and for the year ended December 31, 2018 : Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Balance at beginning of period $ 752 $ 987 Repurchase provision expense 48 345 Adjustments to provision expense — (450 ) Charge offs, net (70 ) (218 ) Amount recorded at acquisition — 88 Balance at end of period $ 730 $ 752 The Corporation may also sell residential mortgage loans with limited recourse (limited in that the recourse period ends prior to the loan’s maturity, usually after certain time and / or loan paydown criteria have been met), whereby repurchase could be required if the loan had defined delinquency issues during the limited recourse periods. At March 31, 2019 and December 31, 2018 , there were approximately $31 million and $47 million , respectively, of residential mortgage loans sold with such recourse risk. There have been limited instances and immaterial historical losses on repurchases for recourse under the limited recourse criteria. The Corporation has a subordinate position to the FHLB in the credit risk on residential mortgage loans it sold to the FHLB in exchange for a monthly credit enhancement fee. The Corporation has not sold loans to the FHLB with such credit risk retention since February 2005. At March 31, 2019 and December 31, 2018 , there were $54 million and $57 million

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
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 2 of the fair value hierarchy. See Note 6 for additional disclosure regarding the Corporation’s investment securities. Equity Securities with Readily Determinable Fair Values: The Corporation's portfolio of equity securities is primarily comprised of CRA Qualified Investment mutual funds. Since quoted prices for the Corporation's equity securities are readily available in an active market, they are classified in Level 1 of the fair value hierarchy. See Note 6 for additional disclosure regarding the Corporation’s investment securities. Residential Loans Held for Sale: Residential 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 is 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 March 31, 2019 , and December 31, 2018 , 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 is 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 also includes a nonperformance / credit risk component (credit valuation adjustment). 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 March 31, 2019 , and December 31, 2018 , 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 March 31, 2019 and December 31, 2018 , aggregated by the level in the fair value hierarchy within which those measurements fall: Fair Value Hierarchy March 31, 2019 December 31, 2018 ($ in Thousands) Assets Investment securities available for sale U.S. Treasury securities Level 1 $ — $ 999 Residential mortgage-related securities FNMA / FHLMC Level 2 242,074 295,252 GNMA Level 2 2,038,100 2,128,531 Private-label Level 2 878 1,003 Commercial mortgage-related securities FNMA / FHLMC Level 2 20,655 — GNMA Level 2 1,247,782 1,220,797 FFELP asset backed securities Level 2 276,899 297,360 Other debt securities Level 2 3,000 3,000 Total investment securities available for sale Level 1 — 999 Total investment securities available for sale Level 2 3,829,388 3,945,943 Equity securities with readily determinable fair values Level 1 1,609 1,568 Residential loans held for sale Level 2 81,392 64,321 Commercial loans held for sale Level 2 15,467 14,943 Interest rate-related instruments Level 2 54,479 52,796 Foreign currency exchange forwards Level 2 1,737 721 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 3,032 2,208 Commodity contracts Level 2 21,705 35,426 Purchased options (time deposit) Level 2 156 109 Liabilities Interest rate-related instruments Level 2 $ 55,008 $ 52,653 Foreign currency exchange forwards Level 2 1,665 675 Forward commitments to sell residential mortgage loans Level 3 1,825 2,072 Commodity contracts Level 2 21,186 34,340 Written options (time deposit) Level 2 156 109 Interest rate products (designated as hedging instruments) Level 2 128 40 The table below presents a rollforward of the consolidated balance sheets amounts for the three months ended March 31, 2019 and the year ended December 31, 2018 , for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy: Derivative Financial Instruments ($ in Thousands) Balance December 31, 2017 $ 1,225 Total net gains (losses) included in income Mortgage derivative gain (loss) (1,085 ) Balance December 31, 2018 $ 140 Total net gains (losses) included in income Mortgage derivative gain (loss) 1,072 Balance March 31, 2019 $ 1,211 For Level 3 assets and liabilities measured at fair value on a recurring basis as of March 31, 2019 , the Corporation utilized the following valuation techniques and significant unobservable inputs: Derivative Financial Instruments (Mortgage Derivative — Interest Rate Lock Commitments to Originate Residential Mortgage Loans Held for Sale): The fair value is determined by the change in value from each loan’s rate lock date to the expected rate lock expiration date based on the underlying loan attributes, estimated closing ratios, and investor price matrix determined to be reasonably applicable to each loan commitment. The closing ratio calculation takes into consideration historical experience and loan-level attributes, particularly the change in the current interest rates from the time of initial rate lock. The closing ratio is periodically reviewed for reasonableness and reported to the Associated Mortgage Risk Management Committee. At March 31, 2019 , 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 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: Commercial 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 March 31, 2019 , 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: MSR 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: Consolidated Statements of Income Category of Adjustment Recognized in Income Adjustment Recognized in the Consolidated Statements of Income ($ in Thousands) Fair Value Hierarchy Fair Value March 31, 2019 Assets Impaired loans (a) Level 3 $ 52,831 Provision for credit losses (b) $ (18,529 ) Other real estate owned (c) Level 2 183 Foreclosure / OREO expense, net (148 ) Mortgage servicing rights Level 3 73,858 Mortgage banking, net (121 ) December 31, 2018 Assets Impaired loans (a) Level 3 $ 26,191 Provision for credit losses (b) $ (14,521 ) Other real estate owned (c) Level 2 2,200 Foreclosure / OREO expense, net (1,545 ) Mortgage servicing rights Level 3 81,012 Mortgage banking, net 545 (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 March 31, 2019 Mortgage servicing rights Discounted cash flow Discount rate 11% Mortgage servicing rights Discounted cash flow Constant prepayment rate 12% Impaired Loans Appraisals / Discounted cash flow Collateral / Discount factor 27% 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: March 31, 2019 December 31, 2018 Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value ($ in Thousands) Financial assets Cash and due from banks Level 1 $ 334,095 $ 334,095 $ 507,187 $ 507,187 Interest-bearing deposits in other financial institutions Level 1 270,843 270,843 221,226 221,226 Federal funds sold and securities purchased under agreements to resell Level 1 41,405 41,405 148,285 148,285 Investment securities held to maturity Level 1 999 1,007 — — Investment securities held to maturity Level 2 2,845,690 2,867,864 2,740,511 2,710,271 Investment securities available for sale Level 1 — — 999 999 Investment securities available for sale Level 2 3,829,388 3,829,388 3,945,943 3,945,943 Equity securities with readily determinable fair values Level 1 1,609 1,609 1,568 1,568 FHLB and Federal Reserve Bank stocks Level 2 216,940 216,940 250,534 250,534 Residential loans held for sale Level 2 81,392 81,392 64,321 64,321 Commercial loans held for sale Level 2 15,467 15,467 14,943 14,943 Loans, net Level 3 22,913,278 22,626,091 22,702,406 22,317,395 Bank and corporate owned life insurance Level 2 665,976 665,976 663,203 663,203 Derivatives (trading assets) Level 2 77,920 77,920 88,943 88,943 Derivatives (other assets) Level 2 156 156 109 109 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 3,032 3,032 2,208 2,208 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 21,781,392 $ 21,781,392 $ 22,081,992 $ 22,081,992 Brokered CDs and other time deposits (a) Level 2 3,751,665 3,751,665 2,815,401 2,815,401 Short-term funding (b) Level 2 179,117 179,117 1,057,074 1,057,074 Long-term funding Level 2 3,720,776 3,761,004 3,469,982 3,492,174 Standby letters of credit (c) Level 2 2,478 2,478 2,482 2,482 Derivatives (trading liabilities) Level 2 77,859 77,859 87,668 87,668 Derivatives (other liabilities) Level 2 284 284 149 149 Forward commitments to sell residential mortgage loans Level 3 1,825 1,825 2,072 2,072 (a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The carrying amount is a reasonable estimate of fair value for existing short-term funding. (c) The commitment on standby letters of credit was $256 million at both March 31, 2019 and December 31, 2018 . See Note 12

Retirement Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2019
Defined Benefit Plan [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit retirement account plan, the 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 was merged into the RAP on December 31, 2018. Bank Mutual's Postretirement Plan was merged into the Corporation's Postretirement Plan during the first quarter of 2018. The reported figures in 2018 for both the Bank Mutual Pension Plan and the Corporation's Postretirement Plan only include two months of Bank Mutual expense due to the timing of the Bank Mutual acquisition. The components of net periodic pension cost and net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for the three months ended March 31, 2019 and 2018 were as follows: Three Months Ended March 31, 2019 2018 ($ in Thousands) Components of Net Periodic Benefit Cost RAP Service cost $ 1,925 $ 1,893 Interest cost 2,413 1,660 Expected return on plan assets (6,075 ) (4,755 ) Amortization of prior service cost (19 ) (19 ) Amortization of actuarial loss 65 463 Total net periodic pension cost $ (1,691 ) $ (759 ) Bank Mutual Pension Plan Interest cost N/A $ 433 Expected return on plan assets N/A (532 ) Total net periodic pension cost N/A $ (99 ) Postretirement Plan Interest cost $ 26 $ 26 Amortization of prior service cost (19 ) (19 ) Amortization of actuarial loss (1 ) 2 Total net periodic benefit cost $ 6 $ 9 The components of net periodic pension cost and 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 RAP. There were no contributions during the three months ended March 31, 2019 and 2018

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2019
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 2018 Annual Report on Form 10-K, with certain exceptions. The more significant of these exceptions are described herein. The reportable segment results are presented based on the Corporation's internal management accounting process. 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. Additionally, the information presented is not indicative of how the segments would perform if they operated as independent entities. To determine financial performance of each segment, the Corporation allocates FTP assignments, the provision for credit losses, certain noninterest expenses, income tax, and equity to each segment. Allocation methodologies are subject to periodic adjustment as the internal management accounting system is revised, the interest rate environment evolves, and business or product lines within the segments change. Also, because the development and application of these methodologies is a dynamic process, the financial results presented may be periodically reviewed. The Corporation allocates net interest income using an internal 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 offset in the Risk Management and Shared Services segment to ensure consolidated totals reflect the Corporation's net interest income. The net FTP allocation is reflected as net intersegment income (expense) in the accompanying tables. 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 2018 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 CDI 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). 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 2018 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. All acquisition related costs are included in the Risk Management and Shared Services segment. Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 115,909 $ 104,435 Net intersegment interest income (expense) (22,622 ) (8,477 ) Segment net interest income 93,287 95,958 Noninterest income 11,445 12,683 Total revenue 104,733 108,641 Credit provision 13,485 10,598 Noninterest expense 38,788 39,250 Income (loss) before income taxes 52,460 58,793 Income tax expense (benefit) 10,003 11,426 Net income $ 42,457 $ 47,367 Allocated goodwill $ 524,525 $ 519,779 Community, Consumer, and Business Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 88,072 $ 86,395 Net intersegment interest income (expense) 23,442 17,148 Segment net interest income 111,514 103,543 Noninterest income 74,223 74,036 Total revenue 185,737 177,579 Credit provision 5,033 4,966 Noninterest expense 130,863 127,144 Income (loss) before income taxes 49,841 45,469 Income tax expense (benefit) 10,443 9,549 Net income $ 39,398 $ 35,920 Allocated goodwill $ 644,419 $ 633,377 Information about the Corporation’s segments is presented below: (continued) Risk Management and Shared Services Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 11,567 $ 19,041 Net intersegment interest income (expense) (821 ) (8,671 ) Segment net interest income 10,746 10,370 Noninterest income 5,533 3,661 Total revenue 16,280 14,031 Credit provision (12,518 ) (15,563 ) Noninterest expense (a) 21,893 46,571 Income (loss) before income taxes 6,905 (16,977 ) Income tax expense (benefit) 1,947 (3,146 ) Net income $ 4,958 $ (13,831 ) Allocated goodwill $ — $ — Consolidated Total Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 215,547 $ 209,871 Net intersegment interest income (expense) — — Segment net interest income 215,547 209,871 Noninterest income 91,202 90,380 Total revenue 306,749 300,251 Credit provision 6,000 — Noninterest expense 191,671 212,965 Income (loss) before income taxes 109,078 87,285 Income tax expense (benefit) 22,392 17,829 Net income $ 86,686 $ 69,456 Allocated goodwill $ 1,168,944 $ 1,153,156 (a) For the three months ended March 31, 2019 and 2018, the Risk Management and Shared Services segment includes approximately $632 thousand and $21 million

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and 2018 respectively, including changes during the preceding three month period 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, 2019 $ (75,643 ) $ (49,330 ) $ (124,972 ) Other comprehensive income (loss) before reclassifications 30,490 — 30,490 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (1,680 ) — (1,680 ) Personnel expense — (38 ) (38 ) Other expense — 64 64 Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities) 69 — 69 Income tax (expense) benefit (7,301 ) (7 ) (7,308 ) Net other comprehensive income (loss) during period 21,578 20 21,597 Balance March 31, 2019 $ (54,065 ) $ (49,310 ) $ (103,375 ) Balance January 1, 2018 $ (38,453 ) $ (24,305 ) $ (62,758 ) Other comprehensive income (loss) before reclassifications (41,834 ) — (41,834 ) Amounts reclassified from accumulated other comprehensive income (loss) Personnel expense — (38 ) (38 ) Other expense — 465 465 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) (297 ) — (297 ) Income tax (expense) benefit 10,635 (107 ) 10,528 Net other comprehensive income (loss) during period (40,000 ) (4,915 ) (44,915 ) Balance March 31, 2018 $ (78,453 ) $ (29,220 ) $ (107,673 )

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2019
Revenue Recognition [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Revenue from contracts with customers 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 Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ — $ — Wealth management fees — — Service charges and deposit account fees 3,388 4,225 Card-based fees (a) 328 315 Other revenue (268 ) 655 Noninterest Income (in-scope of Topic 606) $ 3,448 $ 5,195 Noninterest Income (out-of-scope of Topic 606) 7,998 7,488 Total Noninterest Income $ 11,445 $ 12,683 Community, Consumer, and Business Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ 25,461 $ 22,624 Wealth management fees 20,180 20,401 Service charges and deposit account fees 11,708 12,183 Card-based fees (a) 8,919 9,154 Other revenue 2,632 2,837 Noninterest Income (in-scope of Topic 606) $ 68,899 $ 67,198 Noninterest Income (out-of-scope of Topic 606) 5,325 6,838 Total Noninterest Income $ 74,223 $ 74,036 The Corporation's disaggregated revenue by major source is presented below: (continued) Risk Management and Shared Services Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ 3 $ 24 Wealth management fees — 241 Service charges and deposit account fees 19 12 Card-based fees (a) 49 3 Other revenue 120 52 Noninterest Income (in-scope of Topic 606) $ 191 $ 332 Noninterest Income (out-of-scope of Topic 606) 5,342 3,329 Total Noninterest Income $ 5,533 $ 3,661 Consolidated Total Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ 25,464 $ 22,648 Wealth management fees 20,180 20,642 Service charges and deposit account fees 15,115 16,420 Card-based fees (a) 9,295 9,472 Other revenue 2,484 3,544 Noninterest Income (in-scope of Topic 606) $ 72,538 $ 72,725 Noninterest Income (out-of-scope of Topic 606) 18,665 17,655 Total Noninterest Income $ 91,202 $ 90,380 (a) Certain card-based fees are out-of-scope of Topic 606. The Corporation acquired Diversified in March 2018 and Anderson in June 2018 which resulted in increased insurance commissions and fees. 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 fees (a) Card-based 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 (b) 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 (b) 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. Payments for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage commissions and fees are included in wealth management fees. 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.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. These operating leases have terms of 1 year to 44 years , some of which include options to extend the lease term. An analysis of the lease options has been completed and any optional periods that the Corporation is reasonably likely to extend have been included in the capitalization. The discount rate used to capitalize the operating leases is the Corporation's FHLB borrowing rate on the date of lease commencement. When determining the rate to discount specific lease obligations, the repayment period and term are considered. Operating lease costs for the first three months of 2019 were $2.9 million with operating cash flows from operating leases of $2.8 million . The lease classifications on the consolidated balance sheets were as follows: March 31, 2019 ($ in Thousands) Amount Consolidated Balance Sheets Category Operating lease right-of-use asset $ 49,372 Other assets Finance lease right-of-use asset — Premises and equipment Operating lease liability 53,516 Accrued expenses and other liabilities Finance lease liability — Other long-term funding The weighted-average remaining lease term and weighted-average discount rate were as follows: March 31, 2019 ($ in Thousands) Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment 1.36 2.73 % Retail and corporate offices 6.46 3.43 % Land 12.19 3.39 % Total operating leases 7.28 3.42 % Lease payment obligations for each of the next five years and thereafter in addition to a reconciliation to the Corporation’s lease liability were as follows: ($ in Thousands) Amount Nine Months Ending December 31, 2019 $ 8,330 2020 10,583 2021 9,884 2022 7,440 2023 5,297 Beyond 2023 20,110 Total lease payments 61,644 Less: interest 8,129 Present value of lease payments $ 53,516 As of March 31, 2019 , we have additional operating leases, primarily retail and corporate offices, that have not yet commenced of $19.3 million . These operating leases will commence between May 2019 and July 2023 with lease terms of 3 years to 10 years . Practical Expedients:

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Leases	Leases
New Accounting Pronouncements, Policy	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU-2018-15 Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract The FASB issued an amendment which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments in this Update require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The amendments also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The amendment was effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Entities should apply the amendment either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption was permitted. 1st Quarter 2019 The Corporation elected to early adopt this amendment using the prospective approach. No material impact on results of operation, financial position or liquidity. ASU 2018-09 Codification Improvements The FASB issued an amendment which affects a wide variety of Topics in the Codification. The amendments apply to all reporting entities within the scope of the affected accounting guidance. The amendments in this Update represent changes to clarify, correct errors in, or make minor improvements to the Codification. The amendments make the Codification easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. The transition and effective date guidance is based on the facts and circumstances of each amendment. Some of the amendments in this Update did not require transition guidance and were effective upon issuance of this Update. However, many of the amendments in this Update did have transition guidance with effective dates for annual periods beginning after December 15, 2018. There are some conforming amendments in this Update that have been made to recently issued guidance that is not yet effective that may require application of the transition and effective date guidance in the original Accounting Standards Update. 1st Quarter 2019 No material impact on results of operations, financial position and liquidity. ASU 2016-02 Leases (Topic 842) The FASB issued an amendment to provide transparency and comparability among organizations by recognizing lease assets and lease liabilities on the consolidated balance sheets 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 was 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 was permitted. ASU 2018-01 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. ASU 2018-11 was issued to provide entities with an additional (and optional) transition method to adopt the new leases standard under ASU 2016-02. ASU 2019-01 was issued to assist in determining the fair value of underlying asset by lessors, address the presentation to the statements of cash flows, and clarify transition disclosures related to Topic 250. 1st Quarter 2019 The Corporation has adopted this amendment utilizing a modified retrospective approach. At adoption, a right-of-use asset and corresponding lease liability were recognized on the Consolidated Balance Sheets for $52 million and $56 million, respectively. See Note 18 for expanded disclosure requirements.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Calculations for basic and diluted earnings per common share	Presented below are the calculations for basic and diluted earnings per common share: For the Three Months Ended March 31, 2019 2018 (In Thousands, except per share data) Net income $ 86,686 $ 69,456 Preferred stock dividends (3,801 ) (2,339 ) Net income available to common equity $ 82,885 $ 67,117 Common shareholder dividends (28,080 ) (25,572 ) Unvested share-based payment awards (103 ) (138 ) Undistributed earnings $ 54,702 $ 41,407 Undistributed earnings allocated to common shareholders 54,410 41,225 Undistributed earnings allocated to unvested share-based payment awards 292 182 Undistributed earnings $ 54,702 $ 41,407 Basic Distributed earnings to common shareholders $ 28,080 $ 25,572 Undistributed earnings allocated to common shareholders 54,410 41,225 Total common shareholders earnings, basic $ 82,490 $ 66,797 Diluted Distributed earnings to common shareholders $ 28,080 $ 25,572 Undistributed earnings allocated to common shareholders 54,410 41,225 Total common shareholders earnings, diluted $ 82,490 $ 66,797 Weighted average common shares outstanding 163,928 163,520 Effect of dilutive common stock awards 1,505 2,038 Effect of dilutive common stock warrants — 874 Diluted weighted average common shares outstanding 165,433 166,432 Basic earnings per common share $ 0.50 $ 0.41 Diluted earnings per common share $ 0.50 $ 0.40

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
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 three months of 2019 and full year 2018 : 2019 2018 Dividend yield 3.30 % 2.50 % Risk-free interest rate 2.60 % 2.60 % Weighted average expected volatility 24.00 % 22.00 % Weighted average expected life 5.75 years 5.75 years Weighted average per share fair value of options $4.00 $4.47
Summary of company's stock option activities	A summary of the Corporation’s stock option activity for the three months ended March 31, 2019 is presented below: Stock Options Shares (a) Weighted Average Exercise Price Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2018 5,281 $ 19.09 6.18 $ 12,392 Granted 1,050 22.77 Exercised (355 ) 15.61 Forfeited or expired (72 ) 23.46 Outstanding at March 31, 2019 5,905 $ 19.91 6.82 $ 15,870 Options Exercisable at March 31, 2019 3,691 $ 18.01 5.51 $ 14,953
Summary of restricted stock awards activity (excluding salary shares)	The following table summarizes information about the Corporation’s restricted stock awards activity for the three months ended March 31, 2019 : Restricted Stock Awards Shares (a) Weighted Average Grant Date Fair Value Outstanding at December 31, 2018 1,993 $ 21.92 Granted 1,153 22.21 Vested (618 ) 20.32 Forfeited (18 ) 23.67 Outstanding at March 31, 2019 2,510 $ 22.43

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	The amortized cost and fair values of securities available for sale and held to maturity at March 31, 2019 were as follows: March 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC $ 242,921 $ 1,607 $ (2,453 ) $ 242,074 GNMA 2,060,377 727 (23,004 ) 2,038,100 Private-label 877 1 — 878 Commercial mortgage-related securities FNMA / FHLMC 20,309 346 — 20,655 GNMA 1,291,892 402 (44,512 ) 1,247,782 FFELP asset backed securities 276,164 931 (195 ) 276,899 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 3,895,540 $ 4,013 $ (70,164 ) $ 3,829,388 Investment securities held to maturity U. S. Treasury securities $ 999 $ 8 $ — $ 1,007 Obligations of state and political subdivisions (municipal securities) 1,922,792 39,043 (1,349 ) 1,960,487 Residential mortgage-related securities FNMA / FHLMC 91,003 413 (601 ) 90,815 GNMA 339,742 1,714 (3,314 ) 338,141 GNMA commercial mortgage-related securities 492,154 7,112 (20,846 ) 478,421 Total investment securities held to maturity $ 2,846,689 $ 48,291 $ (26,109 ) $ 2,868,870 The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2018 were as follows: December 31, 2018 Amortized Gross Gross Fair Value ($ in Thousands) Investment securities available for sale U. S. Treasury securities $ 1,000 $ — $ (1 ) $ 999 Residential mortgage-related securities FNMA / FHLMC 296,296 2,466 (3,510 ) 295,252 GNMA 2,169,943 473 (41,885 ) 2,128,531 Private-label 1,007 — (4 ) 1,003 GNMA commercial mortgage-related securities 1,273,309 — (52,512 ) 1,220,797 FFELP asset backed securities 297,347 711 (698 ) 297,360 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 4,041,902 $ 3,649 $ (98,610 ) $ 3,946,941 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) $ 1,790,683 $ 8,255 $ (15,279 ) $ 1,783,659 Residential mortgage-related securities FNMA / FHLMC 92,788 169 (1,795 ) 91,162 GNMA 351,606 1,611 (8,181 ) 345,035 GNMA commercial mortgage-related securities 505,434 7,559 (22,579 ) 490,414 Total investment securities held to maturity $ 2,740,511 $ 17,593 $ (47,835 ) $ 2,710,271
Investment securities held to maturity	The amortized cost and fair values of securities available for sale and held to maturity at March 31, 2019 were as follows: March 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC $ 242,921 $ 1,607 $ (2,453 ) $ 242,074 GNMA 2,060,377 727 (23,004 ) 2,038,100 Private-label 877 1 — 878 Commercial mortgage-related securities FNMA / FHLMC 20,309 346 — 20,655 GNMA 1,291,892 402 (44,512 ) 1,247,782 FFELP asset backed securities 276,164 931 (195 ) 276,899 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 3,895,540 $ 4,013 $ (70,164 ) $ 3,829,388 Investment securities held to maturity U. S. Treasury securities $ 999 $ 8 $ — $ 1,007 Obligations of state and political subdivisions (municipal securities) 1,922,792 39,043 (1,349 ) 1,960,487 Residential mortgage-related securities FNMA / FHLMC 91,003 413 (601 ) 90,815 GNMA 339,742 1,714 (3,314 ) 338,141 GNMA commercial mortgage-related securities 492,154 7,112 (20,846 ) 478,421 Total investment securities held to maturity $ 2,846,689 $ 48,291 $ (26,109 ) $ 2,868,870 The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2018 were as follows: December 31, 2018 Amortized Gross Gross Fair Value ($ in Thousands) Investment securities available for sale U. S. Treasury securities $ 1,000 $ — $ (1 ) $ 999 Residential mortgage-related securities FNMA / FHLMC 296,296 2,466 (3,510 ) 295,252 GNMA 2,169,943 473 (41,885 ) 2,128,531 Private-label 1,007 — (4 ) 1,003 GNMA commercial mortgage-related securities 1,273,309 — (52,512 ) 1,220,797 FFELP asset backed securities 297,347 711 (698 ) 297,360 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 4,041,902 $ 3,649 $ (98,610 ) $ 3,946,941 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) $ 1,790,683 $ 8,255 $ (15,279 ) $ 1,783,659 Residential mortgage-related securities FNMA / FHLMC 92,788 169 (1,795 ) 91,162 GNMA 351,606 1,611 (8,181 ) 345,035 GNMA commercial mortgage-related securities 505,434 7,559 (22,579 ) 490,414 Total investment securities held to maturity $ 2,740,511 $ 17,593 $ (47,835 ) $ 2,710,271
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 March 31, 2019 are shown below: Available for Sale Held to Maturity Amortized Cost Fair Value Amortized Cost Fair Value ($ in Thousands) Due in one year or less $ 1,000 $ 1,000 $ 46,085 $ 46,262 Due after one year through five years 2,000 2,000 190,810 191,172 Due after five years through ten years — — 444,710 450,417 Due after ten years — — 1,242,186 1,273,642 Total debt securities 3,000 3,000 1,923,790 1,961,493 Residential mortgage-related securities FNMA / FHLMC 242,921 242,074 91,003 90,815 GNMA 2,060,377 2,038,100 339,742 338,141 Private-label 877 878 — — Commercial mortgage-related securities FNMA / FHLMC 20,309 20,655 — — GNMA 1,291,892 1,247,782 492,154 478,421 FFELP asset backed securities 276,164 276,899 — — Total investment securities $ 3,895,540 $ 3,829,388 $ 2,846,689 $ 2,868,870 Ratio of fair value to amortized cost 98.3 % 100.8 %
Realized gains and losses and proceeds from sale	The proceeds from the sale of investment securities for the three months ended March 31, 2019 and 2018 are shown below: Three Months Ended March 31, 2019 2018 ($ in Thousands) Gross gains on available for sale securities $ 1,680 $ — Gross gains on held to maturity securities — — Total gains 1,680 — Gross losses on available for sale securities — — Gross losses on held to maturity securities — — Total losses — — Investment securities gains (losses), net $ 1,680 $ — Proceeds from sales of investment securities $ 131,122 $ 452,867
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length	The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2019 : Less than 12 months 12 months or more Total March 31, 2019 Number of Securities Unrealized Losses Fair Value Number of Securities Unrealized Losses Fair Value Unrealized Losses Fair Value ($ in Thousands) Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC 9 $ (5 ) $ 6,468 17 $ (2,448 ) $ 172,018 $ (2,453 ) $ 178,486 GNMA 9 (1,760 ) 110,619 73 (21,245 ) 1,660,128 (23,004 ) 1,770,747 GNMA commercial mortgage-related securities — — — 92 (44,512 ) 1,197,896 (44,512 ) 1,197,896 FFELP asset backed securities 10 (195 ) 128,657 — — — (195 ) 128,657 Total 28 $ (1,959 ) $ 245,744 182 $ (68,205 ) $ 3,030,042 $ (70,164 ) $ 3,275,786 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 7 $ (13 ) $ 5,599 193 $ (1,336 ) $ 136,727 $ (1,349 ) $ 142,326 Residential mortgage-related securities FNMA / FHLMC 1 (3 ) 1,664 22 (598 ) 51,691 (601 ) 53,356 GNMA — — — 63 (3,314 ) 283,774 (3,314 ) 283,774 GNMA commercial mortgage-related securities — — — 25 (20,846 ) 478,421 (20,846 ) 478,421 Total 8 $ (16 ) $ 7,264 303 $ (26,093 ) $ 950,613 $ (26,109 ) $ 957,877 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, 2018 : Less than 12 months 12 months or more Total December 31, 2018 Number Unrealized Fair Number Unrealized Fair Unrealized Fair ($ in Thousands) Investment securities available for sale U.S. Treasury securities — $ — $ — 1 $ (1 ) $ 999 $ (1 ) $ 999 Residential mortgage-related securities FNMA / FHLMC 15 (31 ) 17,993 17 (3,479 ) 189,405 (3,510 ) 207,398 GNMA 12 (4,529 ) 452,183 79 (37,355 ) 1,598,159 (41,885 ) 2,050,342 Private-label 1 (4 ) 1,003 — — — (4 ) 1,003 GNMA commercial mortgage-related securities — — — 93 (52,512 ) 1,220,854 (52,512 ) 1,220,854 FFELP asset backed securities 13 (698 ) 142,432 — — — (698 ) 142,432 Total 41 $ (5,262 ) $ 613,612 190 $ (93,347 ) $ 3,009,417 $ (98,610 ) $ 3,623,028 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 272 $ (2,860 ) $ 313,212 752 $ (12,419 ) $ 509,374 $ (15,279 ) $ 822,586 Residential mortgage-related securities FNMA / FHLMC 13 (780 ) 57,896 22 (1,015 ) 28,888 (1,795 ) 86,784 GNMA 13 (414 ) 19,822 66 (7,767 ) 320,387 (8,181 ) 340,209 GNMA commercial mortgage-related securities — — — 25 (22,579 ) 490,414 (22,579 ) 490,414 Total 298 $ (4,053 ) $ 390,929 865 $ (43,780 ) $ 1,349,063 $ (47,835 ) $ 1,739,992

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loan composition	The period end loan composition was as follows: March 31, 2019 (a) December 31, 2018 (a) ($ in Thousands) Commercial and industrial $ 7,587,597 $ 7,398,044 Commercial real estate — owner occupied 932,393 920,443 Commercial and business lending 8,519,990 8,318,487 Commercial real estate — investor 3,809,253 3,751,554 Real estate construction 1,273,782 1,335,031 Commercial real estate lending 5,083,035 5,086,585 Total commercial 13,603,025 13,405,072 Residential mortgage 8,323,846 8,277,712 Home equity 868,886 894,473 Other consumer 352,602 363,171 Total consumer 9,545,333 9,535,357 Total loans $ 23,148,359 $ 22,940,429
Commercial and consumer loans by credit quality indicator	The following table presents commercial and consumer loans by credit quality indicator at March 31, 2019 : Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 7,371,790 $ 30,657 $ 111,772 $ 73,379 $ 7,587,597 Commercial real estate - owner occupied 874,152 8,422 48,929 890 932,393 Commercial and business lending 8,245,942 39,079 160,701 74,269 8,519,990 Commercial real estate - investor 3,698,679 39,184 70,613 776 3,809,253 Real estate construction 1,259,661 8,782 4,600 739 1,273,782 Commercial real estate lending 4,958,341 47,966 75,213 1,516 5,083,035 Total commercial 13,204,282 87,045 235,914 75,784 13,603,025 Residential mortgage 8,250,915 256 5,351 67,323 8,323,846 Home equity 855,603 891 91 12,300 868,886 Other consumer 351,734 719 — 149 352,602 Total consumer 9,458,252 1,866 5,443 79,772 9,545,333 Total loans $ 22,662,534 $ 88,912 $ 241,357 $ 155,556 $ 23,148,359 The following table presents commercial and consumer loans by credit quality indicator at December 31, 2018 : Pass Special Mention Potential Problem Nonaccrual Total ($ in Thousands) Commercial and industrial $ 7,162,370 $ 78,075 $ 116,578 $ 41,021 $ 7,398,044 Commercial real estate - owner occupied 854,265 6,257 55,964 3,957 920,443 Commercial and business lending 8,016,635 84,332 172,542 44,978 8,318,487 Commercial real estate - investor 3,653,642 28,479 67,481 1,952 3,751,554 Real estate construction 1,321,447 8,771 3,834 979 1,335,031 Commercial real estate lending 4,975,089 37,249 71,315 2,931 5,086,585 Total commercial 12,991,724 121,582 243,856 47,909 13,405,072 Residential mortgage 8,203,729 434 5,975 67,574 8,277,712 Home equity 880,808 1,223 103 12,339 894,473 Other consumer 362,343 749 — 79 363,171 Total consumer 9,446,881 2,406 6,078 79,992 9,535,357 Total loans $ 22,438,605 $ 123,988 $ 249,935 $ 127,901 $ 22,940,429
Summarized details of Loans	The following table presents loans by past due status at March 31, 2019 : Accruing Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total ($ in Thousands) Commercial and industrial $ 7,510,637 $ 2,902 $ 392 $ 287 $ 73,379 $ 7,587,597 Commercial real estate - owner occupied 925,437 6,066 — — 890 932,393 Commercial and business lending 8,436,074 8,968 392 287 74,269 8,519,990 Commercial real estate - investor 3,807,387 1,090 — — 776 3,809,253 Real estate construction 1,266,270 6,727 46 — 739 1,273,782 Commercial real estate lending 5,073,657 7,816 46 — 1,516 5,083,035 Total commercial 13,509,731 16,785 439 287 75,784 13,603,025 Residential mortgage 8,243,248 13,018 256 — 67,323 8,323,846 Home equity 850,223 5,472 891 — 12,300 868,886 Other consumer 348,158 1,389 975 1,931 149 352,602 Total consumer 9,441,629 19,879 2,123 1,931 79,772 9,545,333 Total loans $ 22,951,360 $ 36,663 $ 2,562 $ 2,218 $ 155,556 $ 23,148,359 (a) Of the total nonaccrual loans, $106 million , or 68% , were current with respect to payment at March 31, 2019 . The following table presents loans by past due status at December 31, 2018 : Accruing Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total ($ in Thousands) Commercial and industrial $ 7,356,187 $ 187 $ 338 $ 311 $ 41,021 $ 7,398,044 Commercial real estate - owner occupied 913,787 2,580 119 — 3,957 920,443 Commercial and business lending 8,269,974 2,767 457 311 44,978 8,318,487 Commercial real estate - investor 3,745,835 2,954 813 — 1,952 3,751,554 Real estate construction 1,333,722 330 — — 979 1,335,031 Commercial real estate lending 5,079,557 3,284 813 — 2,931 5,086,585 Total commercial 13,349,531 6,051 1,270 311 47,909 13,405,072 Residential mortgage 8,200,432 9,272 434 — 67,574 8,277,712 Home equity 876,085 4,826 1,223 — 12,339 894,473 Other consumer 358,970 1,401 868 1,853 79 363,171 Total consumer 9,435,487 15,499 2,525 1,853 79,992 9,535,357 Total loans $ 22,785,019 $ 21,550 $ 3,795 $ 2,165 $ 127,901 $ 22,940,429 (a) Of the total nonaccrual loans, $74 million , or 58% , were current with respect to payment at December 31, 2018
Summarized details of impaired Loans	The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $5 million of purchased credit-impaired loans, at March 31, 2019 : Recorded Unpaid Related Average Interest ($ in Thousands) Loans with a related allowance Commercial and industrial $ 44,810 $ 48,448 $ 10,876 $ 36,288 $ 317 Commercial real estate — owner occupied 2,104 2,111 50 2,122 27 Commercial and business lending 46,914 50,559 10,926 38,411 344 Commercial real estate — investor 1,700 1,799 26 792 17 Real estate construction 498 578 69 502 9 Commercial real estate lending 2,198 2,377 94 1,293 25 Total commercial 49,112 52,936 11,021 39,704 369 Residential mortgage 46,165 49,395 6,197 43,194 527 Home equity 10,792 11,815 3,348 10,015 128 Other consumer 1,158 1,161 119 1,159 — Total consumer 58,116 62,370 9,664 54,368 655 Total loans (a) $ 107,228 $ 115,307 $ 20,684 $ 94,072 $ 1,025 Loans with no related allowance Commercial and industrial $ 42,988 $ 61,425 $ — $ 15,896 $ 1,657 Commercial real estate — owner occupied 730 740 — — 3 Commercial and business lending 43,718 62,166 — 15,896 1,660 Commercial real estate — investor 635 1,805 — 1,559 — Real estate construction — — — — — Commercial real estate lending 635 1,805 — 1,559 — Total commercial 44,353 63,970 — 17,455 1,660 Residential mortgage 8,182 8,429 — 7,885 48 Home equity — — — 523 — Other consumer — — — — — Total consumer 8,182 8,429 — 8,408 48 Total loans (a) $ 52,535 $ 72,399 $ — $ 25,863 $ 1,708 Total Commercial and industrial $ 87,798 $ 109,873 $ 10,876 $ 52,184 $ 1,974 Commercial real estate — owner occupied 2,834 2,851 50 2,122 30 Commercial and business lending 90,632 112,724 10,926 54,307 2,004 Commercial real estate — investor 2,335 3,604 26 2,351 17 Real estate construction 498 578 69 502 9 Commercial real estate lending 2,833 4,182 94 2,852 25 Total commercial 93,465 116,906 11,021 57,159 2,029 Residential mortgage 54,348 57,824 6,197 51,079 574 Home equity 10,792 11,815 3,348 10,538 128 Other consumer 1,158 1,161 119 1,159 — Total consumer 66,298 70,799 9,664 62,776 703 Total loans (a) $ 159,763 $ 187,705 $ 20,684 $ 119,935 $ 2,732 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 74% of the unpaid principal balance at March 31, 2019 . The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $5 million of purchased credit-impaired loans, at December 31, 2018 : Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized ($ in Thousands) Loans with a related allowance Commercial and industrial $ 40,747 $ 42,131 $ 5,721 $ 52,461 $ 1,167 Commercial real estate — owner occupied 2,080 2,087 24 2,179 104 Commercial and business lending 42,827 44,218 5,745 54,640 1,271 Commercial real estate — investor 799 805 28 827 38 Real estate construction 510 589 75 533 32 Commercial real estate lending 1,309 1,394 103 1,360 70 Total commercial 44,136 45,612 5,848 56,000 1,341 Residential mortgage 41,691 45,149 6,023 42,687 1,789 Home equity 9,601 10,539 3,312 10,209 566 Other consumer 1,181 1,183 121 1,184 3 Total consumer 52,473 56,871 9,456 54,080 2,358 Total loans (a) $ 96,609 $ 102,483 $ 15,304 $ 110,079 $ 3,699 Loans with no related allowance Commercial and industrial $ 22,406 $ 45,024 $ — $ 21,352 $ (344 ) Commercial real estate — owner occupied 3,772 4,823 — 3,975 — Commercial and business lending 26,178 49,847 — 25,327 (344 ) Commercial real estate — investor 1,585 2,820 — 980 68 Real estate construction — — — — — Commercial real estate lending 1,585 2,820 — 980 68 Total commercial 27,763 52,667 — 26,307 (276 ) Residential mortgage 8,795 9,074 — 8,790 203 Home equity 523 542 — 530 — Other consumer — — — — — Total consumer 9,318 9,616 — 9,320 203 Total loans (a) $ 37,081 $ 62,283 $ — $ 35,627 $ (73 ) Total Commercial and industrial $ 63,153 $ 87,155 $ 5,721 $ 73,813 $ 823 Commercial real estate — owner occupied 5,852 6,910 24 6,154 104 Commercial and business lending 69,005 94,065 5,745 79,967 927 Commercial real estate — investor 2,384 3,625 28 1,807 106 Real estate construction 510 589 75 533 32 Commercial real estate lending 2,894 4,214 103 2,340 138 Total commercial 71,899 98,279 5,848 82,307 1,065 Residential mortgage 50,486 54,223 6,023 51,477 1,992 Home equity 10,124 11,081 3,312 10,739 566 Other consumer 1,181 1,183 121 1,184 3 Total consumer 61,791 66,487 9,456 63,400 2,561 Total loans (a) $ 133,690 $ 164,766 $ 15,304 $ 145,707 $ 3,626 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 72% of the unpaid principal balance at December 31, 2018
Nonaccrual and performing restructured loans	The following table presents nonaccrual and performing restructured loans by loan portfolio: March 31, 2019 December 31, 2018 Performing Restructured Loans Nonaccrual Restructured Loans (a) Performing Restructured Loans Nonaccrual Restructured Loans (a) ($ in Thousands) Commercial and industrial $ 15,443 $ 107 $ 25,478 $ 249 Commercial real estate — owner occupied 2,026 78 2,080 — Commercial real estate — investor 1,700 — 799 933 Real estate construction 311 187 311 198 Residential mortgage 18,226 21,549 16,036 22,279 Home equity 7,688 2,247 7,385 2,627 Other consumer 1,154 5 1,174 6 Total restructured loans $ 46,548 $ 24,172 $ 53,263 $ 26,292
Summary of restructured loans	Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 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 — $ — $ — 2 $ 92 $ 92 Commercial real estate — owner occupied 1 78 78 — — — Commercial real estate — investor — — — 1 1,007 1,037 Residential mortgage 25 4,357 4,374 11 1,807 1,807 Home equity 13 293 312 17 1,044 1,060 Other consumer 1 11 11 2 8 11 Total loans modified 40 $ 4,739 $ 4,776 33 $ 3,958 $ 4,007 (a) Represents post-modification outstanding recorded investment.
Troubled debt restructurings subsequent redefault	The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2019 and 2018 and the recorded investment in these restructured loans as of March 31, 2019 and 2018 : Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 Number of Loans Recorded Investment Number of Loans Recorded Investment ($ in Thousands) Residential mortgage 5 $ 613 4 $ 467 Home equity 7 177 12 954 Total loans modified 12 $ 790 16 $ 1,421
Changes in the allowance for loan losses by portfolio segment	The following table presents a summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2019 : ($ in Thousands) Commercial and Commercial real estate - owner occupied Commercial real estate - Real estate Residential Home Other Total December 31, 2018 $ 108,835 $ 9,255 $ 40,844 $ 28,240 $ 25,595 $ 19,266 $ 5,988 $ 238,023 Charge offs (13,216 ) — — (52 ) (652 ) (254 ) (1,312 ) (15,486 ) Recoveries 5,788 1,193 31 52 195 563 222 8,044 Net Charge offs (7,428 ) 1,193 31 — (457 ) 309 (1,090 ) (7,442 ) Provision for loan losses 7,525 131 289 (1,326 ) (1,567 ) (1,639 ) 1,087 4,500 March 31, 2019 $ 108,933 $ 10,579 $ 41,164 $ 26,914 $ 23,571 $ 17,936 $ 5,984 $ 235,081 Allowance for loan losses Individually evaluated for impairment $ 10,876 $ 50 $ 26 $ 69 $ 6,197 $ 3,348 $ 119 $ 20,684 Collectively evaluated for impairment 98,057 10,529 41,138 26,845 17,373 14,588 5,866 214,396 Acquired and accounted for under ASC 310-30 (a) — — — — — — — — Total allowance for loan losses $ 108,933 $ 10,579 $ 41,164 $ 26,914 $ 23,571 $ 17,936 $ 5,984 $ 235,081 Loans Individually evaluated for impairment $ 87,798 $ 2,834 $ 2,335 $ 498 $ 54,347 $ 10,793 $ 1,158 $ 159,763 Collectively evaluated for impairment 7,496,743 928,723 3,806,635 1,273,267 8,268,834 858,044 351,443 22,983,688 Acquired and accounted for under ASC 310-30 (a) 3,057 836 283 18 664 49 — 4,907 Total loans $ 7,587,597 $ 932,393 $ 3,809,253 $ 1,273,782 $ 8,323,846 $ 868,886 $ 352,602 $ 23,148,359 (a) Loans acquired in business combinations and accounted for under ASC topic 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, 2018 , was as follows: ($ in Thousands) Commercial and Commercial real estate Commercial real estate - Real estate Residential Home Other Total December 31, 2017 $ 123,068 $ 10,352 $ 41,059 $ 34,370 $ 29,607 $ 22,126 $ 5,298 $ 265,880 Charge offs (30,837 ) (1,363 ) (7,914 ) (298 ) (1,627 ) (3,236 ) (5,261 ) (50,536 ) Recoveries 13,714 639 668 446 1,271 2,628 812 20,179 Net Charge offs (17,123 ) (724 ) (7,246 ) 149 (355 ) (608 ) (4,448 ) (30,358 ) Provision for loan losses 2,890 (373 ) 7,031 (6,279 ) (3,657 ) (2,252 ) 5,138 2,500 December 31, 2018 $ 108,835 $ 9,255 $ 40,844 $ 28,240 $ 25,595 $ 19,266 $ 5,988 $ 238,023 Allowance for loan losses Individually evaluated for impairment $ 5,721 $ 24 $ 28 $ 75 $ 6,023 $ 3,312 $ 121 $ 15,304 Collectively evaluated for impairment 103,114 9,231 40,816 28,165 19,572 15,954 5,867 222,719 Acquired and accounted for under ASC 310-30 (a) — — — — — — — — Total allowance for loan losses $ 108,835 $ 9,255 $ 40,844 $ 28,240 $ 25,595 $ 19,266 $ 5,988 $ 238,023 Loans Individually evaluated for impairment $ 63,153 $ 5,852 $ 2,384 $ 510 $ 50,486 $ 10,124 $ 1,181 $ 133,690 Collectively evaluated for impairment 7,331,898 913,708 3,748,883 1,334,500 8,226,642 884,266 361,990 22,801,887 Acquired and accounted for under ASC 310-30 (a) 2,994 883 287 21 584 83 — 4,853 Total loans $ 7,398,044 $ 920,443 $ 3,751,554 $ 1,335,031 $ 8,277,712 $ 894,473 $ 363,171 $ 22,940,429
Changes in the allowance for unfunded commitments	The following table presents a summary of the changes in the allowance for unfunded commitments: Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Allowance for Unfunded Commitments Balance at beginning of period $ 24,336 $ 24,400 Provision for unfunded commitments 1,500 (2,500 ) Amount recorded at acquisition — 2,436 Balance at end of period $ 25,836 $ 24,336
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 three months ended March 31, 2019 and for the year ended December 31, 2018 : Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Changes in Accretable Yield Balance at beginning of period $ 1,482 $ — Purchases — 4,853 Accretion (221 ) (4,954 ) Net reclassification from non-accretable yield 23 1,605 Other (a) — (22 ) Balance at end of period $ 1,285 $ 1,482

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	For CDI and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Core deposit intangibles Gross carrying amount $ 58,100 $ 58,100 Accumulated amortization (6,778 ) (5,326 ) Net book value $ 51,322 $ 52,774 Additions during the periods $ — $ 58,100 Amortization during the year $ 1,453 $ 5,326 Other intangibles Gross carrying amount $ 44,887 $ 44,931 Reductions due to sale — (43 ) Accumulated amortization (22,599 ) (21,825 ) Net book value $ 22,288 $ 23,062 Additions during the period $ — $ 10,359 Amortization during the year $ 774 $ 2,833
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 is as follows: Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Mortgage servicing rights Mortgage servicing rights at beginning of period $ 68,433 $ 59,168 Additions from acquisition — 8,136 Additions 1,247 10,722 Amortization (2,693 ) (9,594 ) Mortgage servicing rights at end of period $ 66,987 $ 68,433 Valuation allowance at beginning of period (239 ) (784 ) (Additions) recoveries, net (121 ) 545 Valuation allowance at end of period (360 ) (239 ) Mortgage servicing rights, net $ 66,626 $ 68,193 Fair value of mortgage servicing rights $ 73,858 $ 81,012 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 8,543,467 $ 8,600,983 Mortgage servicing rights, net to servicing portfolio 0.78 % 0.79 % Mortgage servicing rights expense (a) $ 2,814 $ 9,049
Summary of estimated future amortization expense	The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2019 . 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. The following table shows the estimated future amortization expense for amortizing intangible assets: Estimated Amortization Expense Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights ($ in Thousands) Nine Months Ending December 31, 2019 $ 4,358 $ 2,050 $ 7,983 2020 5,810 2,707 11,032 2021 5,810 2,682 9,334 2022 5,810 2,659 7,848 2023 5,810 2,640 6,579 2024 5,810 2,620 5,507 Beyond 2024 17,914 6,931 18,703 Total Estimated Amortization Expense $ 51,322 $ 22,288 $ 66,987

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Breakdown of short & long-term debt balances	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): March 31, 2019 December 31, 2018 ($ in Thousands) Short-Term Funding Federal funds purchased $ 13,090 $ 19,710 Securities sold under agreements to repurchase 114,008 91,941 Federal funds purchased and securities sold under agreements to repurchase 127,098 111,651 Commercial paper 32,019 45,423 Total short-term funding $ 159,117 $ 157,074 Long-Term Funding Corporation senior notes, at par, due 2019 $ 250,000 $ 250,000 Bank senior notes, at par, due 2021 300,000 300,000 Corporation subordinated notes, at par, due 2025 250,000 250,000 Other long-term funding and capitalized costs (3,993 ) (4,389 ) Total long-term funding 796,007 795,611 Total short and long-term funding, excluding FHLB advances $ 955,123 $ 952,685 FHLB Advances Short-term FHLB advances $ 20,000 $ 900,000 Long-term FHLB advances 2,924,769 2,674,371 Total FHLB advances $ 2,944,769 $ 3,574,371 Total short and long-term funding $ 3,899,893 $ 4,527,056
Remaining contractual maturity of securities sold under agreements to repurchase	The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of March 31, 2019 and December 31, 2018 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 ($ in Thousands) March 31, 2019 Repurchase agreements Agency mortgage-related securities $ 114,008 $ — $ — $ — $ 114,008 Total $ 114,008 $ — $ — $ — $ 114,008 December 31, 2018 Repurchase agreements Agency mortgage-related securities $ 91,941 $ — $ — $ — $ 91,941 Total $ 91,941 $ — $ — $ — $ 91,941
FHLB Maturity	The original contractual maturity or next put date of the Corporation's FHLB advances as of March 31, 2019 and December 31, 2018 are presented in the following table: March 31, 2019 December 31, 2018 Amount Weighted Average Contractual Coupon Rate Amount Weighted Average Contractual Coupon Rate ($ in Thousands) Maturity or put date 1 year or less $ 2,232,703 2.79 % $ 2,262,584 2.06 % After 1 but within 2 688,035 2.43 % 1,285,039 2.39 % After 2 but within 3 16,064 3.22 % 14,393 2.98 % After 3 years 7,968 3.78 % 12,354 4.55 % FHLB advances and overall rate $ 2,944,769 2.71 % $ 3,574,371 2.19 %

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other derivative instruments not designated as hedging instruments	The table below identifies the consolidated balance sheets category and fair values of the Corporation’s derivative instruments: March 31, 2019 December 31, 2018 ($ in Thousands) Notional Amount Fair Consolidated Notional Amount Fair Consolidated Derivatives not designated as hedging instruments Interest rate-related instruments — customer and mirror $ 2,726,738 $ 54,479 Trading assets $ 2,707,204 $ 52,796 Trading assets Interest rate-related instruments — customer and mirror 2,726,738 (55,008 ) Trading liabilities 2,707,204 (52,653 ) Trading liabilities Foreign currency exchange forwards 92,285 1,737 Trading assets 117,879 721 Trading assets Foreign currency exchange forwards 103,238 (1,665 ) Trading liabilities 69,153 (675 ) Trading liabilities Commodity contracts 284,655 21,705 Trading assets 331,727 35,426 Trading assets Commodity contracts 284,656 (21,186 ) Trading liabilities 315,861 (34,340 ) Trading liabilities Interest rate lock commitments (mortgage) 269,075 3,032 Other assets 191,222 2,208 Other assets Forward commitments (mortgage) 191,112 (1,825 ) Other liabilities 139,984 (2,072 ) Other liabilities Purchased options (time deposit) 7,885 156 Other assets 11,185 109 Other assets Written options (time deposit) 7,885 (156 ) Other liabilities 11,185 (109 ) Other liabilities Derivatives designated as hedging instruments Interest Rate Products 500,000 (128 ) Other liabilities 500,000 (40 ) Other liabilities
Cumulative basis adjustment for fair value hedges	The following table presents amounts that were recorded on the consolidated balance sheets 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) March 31, 2019 Loans and investment securities receivables (a) $ 501,555 $ 1,555 Total $ 501,555 $ 1,555 (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 March 31, 2019 , the amortized cost basis of the closed portfolios used in these hedging relationships was $1.1 billion ; the positive cumulative basis adjustments associated with these hedging relationships was $2 million; and the amounts of the designated hedged items were $500 million
Schedule of cash flow hedging instruments, statements of financial performance and financial position location	The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income during the three months ended March 31, 2019 and twelve months ended December 31, 2018 : Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Total amounts of income and expense line items presented in the consolidated statements of income in which the effects of fair value or cash flow hedges are recorded $ 166 $ — $ (1,325 ) $ — 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 2,057 — (502 ) — Derivatives designated as hedging instruments (a) (1,891 ) — (823 ) —
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 consolidated statements of income during the three months ended March 31, 2019 and 2018 : Consolidated Statements of Income Category of Gain / (Loss) Recognized in Income For the Three Months Ended March 31, ($ in Thousands) 2019 2018 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ (672 ) $ 492 Foreign currency exchange forwards Capital markets, net 26 (28 ) Commodity contracts Capital markets, net (567 ) 164 Interest rate lock commitments (mortgage) Mortgage banking, net 824 1,494 Forward commitments (mortgage) Mortgage banking, net 247 10

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	3 Months Ended
	Mar. 31, 2019
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 are therefore excluded from this table: Gross amounts of recognized assets Gross amounts not offset in the consolidated balance sheets ($ 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) March 31, 2019 $ 25,486 $ — $ 25,486 $ (24,210 ) $ (1,044 ) $ 232 December 31, 2018 65,596 — 65,596 (22,873 ) (41,879 ) 843 Gross amounts of recognized liabilities Gross amounts not offset ($ 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) March 31, 2019 $ 52,768 $ — $ 52,768 $ (24,210 ) $ (25,889 ) $ 2,669 December 31, 2018 22,951 — 22,951 (22,873 ) (63 ) 16 (a) Includes interest and commodity instrument assets. (b) Includes interest and commodity instrument liabilities.

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: March 31, 2019 December 31, 2018 ($ in Thousands) Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 8,687,001 $ 8,720,293 Commercial letters of credit (a) 6,192 7,599 Standby letters of credit (c) 256,389 255,904 (a) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at March 31, 2019 or December 31, 2018 . (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10 . (c) The Corporation has established a liability of $2 million at both March 31, 2019 and December 31, 2018
Summary of changes in the residential mortgage repurchase reserve	The following summarizes the changes in the mortgage repurchase reserve for the three months ended March 31, 2019 and for the year ended December 31, 2018 : Three Months Ended March 31, 2019 Year Ended December 31, 2018 ($ in Thousands) Balance at beginning of period $ 752 $ 987 Repurchase provision expense 48 345 Adjustments to provision expense — (450 ) Charge offs, net (70 ) (218 ) Amount recorded at acquisition — 88 Balance at end of period $ 730 $ 752

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Assets and liabilities measured on recurring basis at fair value	The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018 , aggregated by the level in the fair value hierarchy within which those measurements fall: Fair Value Hierarchy March 31, 2019 December 31, 2018 ($ in Thousands) Assets Investment securities available for sale U.S. Treasury securities Level 1 $ — $ 999 Residential mortgage-related securities FNMA / FHLMC Level 2 242,074 295,252 GNMA Level 2 2,038,100 2,128,531 Private-label Level 2 878 1,003 Commercial mortgage-related securities FNMA / FHLMC Level 2 20,655 — GNMA Level 2 1,247,782 1,220,797 FFELP asset backed securities Level 2 276,899 297,360 Other debt securities Level 2 3,000 3,000 Total investment securities available for sale Level 1 — 999 Total investment securities available for sale Level 2 3,829,388 3,945,943 Equity securities with readily determinable fair values Level 1 1,609 1,568 Residential loans held for sale Level 2 81,392 64,321 Commercial loans held for sale Level 2 15,467 14,943 Interest rate-related instruments Level 2 54,479 52,796 Foreign currency exchange forwards Level 2 1,737 721 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 3,032 2,208 Commodity contracts Level 2 21,705 35,426 Purchased options (time deposit) Level 2 156 109 Liabilities Interest rate-related instruments Level 2 $ 55,008 $ 52,653 Foreign currency exchange forwards Level 2 1,665 675 Forward commitments to sell residential mortgage loans Level 3 1,825 2,072 Commodity contracts Level 2 21,186 34,340 Written options (time deposit) Level 2 156 109 Interest rate products (designated as hedging instruments) Level 2 128 40
Assets and liabilities measured at fair value using significant unobservable inputs (level 3)	The table below presents a rollforward of the consolidated balance sheets amounts for the three months ended March 31, 2019 and the year ended December 31, 2018 , for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy: Derivative Financial Instruments ($ in Thousands) Balance December 31, 2017 $ 1,225 Total net gains (losses) included in income Mortgage derivative gain (loss) (1,085 ) Balance December 31, 2018 $ 140 Total net gains (losses) included in income Mortgage derivative gain (loss) 1,072 Balance March 31, 2019 $ 1,211
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: Consolidated Statements of Income Category of Adjustment Recognized in Income Adjustment Recognized in the Consolidated Statements of Income ($ in Thousands) Fair Value Hierarchy Fair Value March 31, 2019 Assets Impaired loans (a) Level 3 $ 52,831 Provision for credit losses (b) $ (18,529 ) Other real estate owned (c) Level 2 183 Foreclosure / OREO expense, net (148 ) Mortgage servicing rights Level 3 73,858 Mortgage banking, net (121 ) December 31, 2018 Assets Impaired loans (a) Level 3 $ 26,191 Provision for credit losses (b) $ (14,521 ) Other real estate owned (c) Level 2 2,200 Foreclosure / OREO expense, net (1,545 ) Mortgage servicing rights Level 3 81,012 Mortgage banking, net 545 (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.
Schedule of assumptions for fair value as of balance sheet date of assets or liabilities that relate to transferor's continuing involvement	The table below presents information about these inputs and further discussion is found above: Valuation Technique Significant Unobservable Input Weighted Average Input Applied March 31, 2019 Mortgage servicing rights Discounted cash flow Discount rate 11% Mortgage servicing rights Discounted cash flow Constant prepayment rate 12% Impaired Loans Appraisals / Discounted cash flow Collateral / Discount factor 27%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: March 31, 2019 December 31, 2018 Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value ($ in Thousands) Financial assets Cash and due from banks Level 1 $ 334,095 $ 334,095 $ 507,187 $ 507,187 Interest-bearing deposits in other financial institutions Level 1 270,843 270,843 221,226 221,226 Federal funds sold and securities purchased under agreements to resell Level 1 41,405 41,405 148,285 148,285 Investment securities held to maturity Level 1 999 1,007 — — Investment securities held to maturity Level 2 2,845,690 2,867,864 2,740,511 2,710,271 Investment securities available for sale Level 1 — — 999 999 Investment securities available for sale Level 2 3,829,388 3,829,388 3,945,943 3,945,943 Equity securities with readily determinable fair values Level 1 1,609 1,609 1,568 1,568 FHLB and Federal Reserve Bank stocks Level 2 216,940 216,940 250,534 250,534 Residential loans held for sale Level 2 81,392 81,392 64,321 64,321 Commercial loans held for sale Level 2 15,467 15,467 14,943 14,943 Loans, net Level 3 22,913,278 22,626,091 22,702,406 22,317,395 Bank and corporate owned life insurance Level 2 665,976 665,976 663,203 663,203 Derivatives (trading assets) Level 2 77,920 77,920 88,943 88,943 Derivatives (other assets) Level 2 156 156 109 109 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 3,032 3,032 2,208 2,208 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 21,781,392 $ 21,781,392 $ 22,081,992 $ 22,081,992 Brokered CDs and other time deposits (a) Level 2 3,751,665 3,751,665 2,815,401 2,815,401 Short-term funding (b) Level 2 179,117 179,117 1,057,074 1,057,074 Long-term funding Level 2 3,720,776 3,761,004 3,469,982 3,492,174 Standby letters of credit (c) Level 2 2,478 2,478 2,482 2,482 Derivatives (trading liabilities) Level 2 77,859 77,859 87,668 87,668 Derivatives (other liabilities) Level 2 284 284 149 149 Forward commitments to sell residential mortgage loans Level 3 1,825 1,825 2,072 2,072 (a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The carrying amount is a reasonable estimate of fair value for existing short-term funding. (c) The commitment on standby letters of credit was $256 million at both March 31, 2019 and December 31, 2018 . See Note 12

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Defined Benefit Plan [Abstract]
Net period benefit cost for the pension and postretirement plans	The components of net periodic pension cost and net periodic benefit cost for the RAP, Bank Mutual Pension Plan, and Postretirement Plan for the three months ended March 31, 2019 and 2018 were as follows: Three Months Ended March 31, 2019 2018 ($ in Thousands) Components of Net Periodic Benefit Cost RAP Service cost $ 1,925 $ 1,893 Interest cost 2,413 1,660 Expected return on plan assets (6,075 ) (4,755 ) Amortization of prior service cost (19 ) (19 ) Amortization of actuarial loss 65 463 Total net periodic pension cost $ (1,691 ) $ (759 ) Bank Mutual Pension Plan Interest cost N/A $ 433 Expected return on plan assets N/A (532 ) Total net periodic pension cost N/A $ (99 ) Postretirement Plan Interest cost $ 26 $ 26 Amortization of prior service cost (19 ) (19 ) Amortization of actuarial loss (1 ) 2 Total net periodic benefit cost $ 6 $ 9

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting Information [Line Items]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 115,909 $ 104,435 Net intersegment interest income (expense) (22,622 ) (8,477 ) Segment net interest income 93,287 95,958 Noninterest income 11,445 12,683 Total revenue 104,733 108,641 Credit provision 13,485 10,598 Noninterest expense 38,788 39,250 Income (loss) before income taxes 52,460 58,793 Income tax expense (benefit) 10,003 11,426 Net income $ 42,457 $ 47,367 Allocated goodwill $ 524,525 $ 519,779 Community, Consumer, and Business Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 88,072 $ 86,395 Net intersegment interest income (expense) 23,442 17,148 Segment net interest income 111,514 103,543 Noninterest income 74,223 74,036 Total revenue 185,737 177,579 Credit provision 5,033 4,966 Noninterest expense 130,863 127,144 Income (loss) before income taxes 49,841 45,469 Income tax expense (benefit) 10,443 9,549 Net income $ 39,398 $ 35,920 Allocated goodwill $ 644,419 $ 633,377 Information about the Corporation’s segments is presented below: (continued) Risk Management and Shared Services Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 11,567 $ 19,041 Net intersegment interest income (expense) (821 ) (8,671 ) Segment net interest income 10,746 10,370 Noninterest income 5,533 3,661 Total revenue 16,280 14,031 Credit provision (12,518 ) (15,563 ) Noninterest expense (a) 21,893 46,571 Income (loss) before income taxes 6,905 (16,977 ) Income tax expense (benefit) 1,947 (3,146 ) Net income $ 4,958 $ (13,831 ) Allocated goodwill $ — $ — Consolidated Total Three Months Ended March 31, 2019 2018 ($ in Thousands) Net interest income $ 215,547 $ 209,871 Net intersegment interest income (expense) — — Segment net interest income 215,547 209,871 Noninterest income 91,202 90,380 Total revenue 306,749 300,251 Credit provision 6,000 — Noninterest expense 191,671 212,965 Income (loss) before income taxes 109,078 87,285 Income tax expense (benefit) 22,392 17,829 Net income $ 86,686 $ 69,456 Allocated goodwill $ 1,168,944 $ 1,153,156 (a) For the three months ended March 31, 2019 and 2018, the Risk Management and Shared Services segment includes approximately $632 thousand and $21 million

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and 2018 respectively, including changes during the preceding three month period 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, 2019 $ (75,643 ) $ (49,330 ) $ (124,972 ) Other comprehensive income (loss) before reclassifications 30,490 — 30,490 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (1,680 ) — (1,680 ) Personnel expense — (38 ) (38 ) Other expense — 64 64 Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities) 69 — 69 Income tax (expense) benefit (7,301 ) (7 ) (7,308 ) Net other comprehensive income (loss) during period 21,578 20 21,597 Balance March 31, 2019 $ (54,065 ) $ (49,310 ) $ (103,375 ) Balance January 1, 2018 $ (38,453 ) $ (24,305 ) $ (62,758 ) Other comprehensive income (loss) before reclassifications (41,834 ) — (41,834 ) Amounts reclassified from accumulated other comprehensive income (loss) Personnel expense — (38 ) (38 ) Other expense — 465 465 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) (297 ) — (297 ) Income tax (expense) benefit 10,635 (107 ) 10,528 Net other comprehensive income (loss) during period (40,000 ) (4,915 ) (44,915 ) Balance March 31, 2018 $ (78,453 ) $ (29,220 ) $ (107,673 )

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue Recognition [Abstract]
Disaggregation of revenue by Major source	The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ — $ — Wealth management fees — — Service charges and deposit account fees 3,388 4,225 Card-based fees (a) 328 315 Other revenue (268 ) 655 Noninterest Income (in-scope of Topic 606) $ 3,448 $ 5,195 Noninterest Income (out-of-scope of Topic 606) 7,998 7,488 Total Noninterest Income $ 11,445 $ 12,683 Community, Consumer, and Business Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ 25,461 $ 22,624 Wealth management fees 20,180 20,401 Service charges and deposit account fees 11,708 12,183 Card-based fees (a) 8,919 9,154 Other revenue 2,632 2,837 Noninterest Income (in-scope of Topic 606) $ 68,899 $ 67,198 Noninterest Income (out-of-scope of Topic 606) 5,325 6,838 Total Noninterest Income $ 74,223 $ 74,036 The Corporation's disaggregated revenue by major source is presented below: (continued) Risk Management and Shared Services Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ 3 $ 24 Wealth management fees — 241 Service charges and deposit account fees 19 12 Card-based fees (a) 49 3 Other revenue 120 52 Noninterest Income (in-scope of Topic 606) $ 191 $ 332 Noninterest Income (out-of-scope of Topic 606) 5,342 3,329 Total Noninterest Income $ 5,533 $ 3,661 Consolidated Total Three Months Ended March 31, 2019 2018 ($ in Thousands) Insurance commissions and fees $ 25,464 $ 22,648 Wealth management fees 20,180 20,642 Service charges and deposit account fees 15,115 16,420 Card-based fees (a) 9,295 9,472 Other revenue 2,484 3,544 Noninterest Income (in-scope of Topic 606) $ 72,538 $ 72,725 Noninterest Income (out-of-scope of Topic 606) 18,665 17,655 Total Noninterest Income $ 91,202 $ 90,380
Revenue recognition 606	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 fees (a) Card-based 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 (b) 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 (b) 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. Payments for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage commissions and fees are included in wealth management fees.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Components of lease expense	The lease classifications on the consolidated balance sheets were as follows: March 31, 2019 ($ in Thousands) Amount Consolidated Balance Sheets Category Operating lease right-of-use asset $ 49,372 Other assets Finance lease right-of-use asset — Premises and equipment Operating lease liability 53,516 Accrued expenses and other liabilities Finance lease liability — Other long-term funding
Operating lease information	The weighted-average remaining lease term and weighted-average discount rate were as follows: March 31, 2019 ($ in Thousands) Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment 1.36 2.73 % Retail and corporate offices 6.46 3.43 % Land 12.19 3.39 % Total operating leases 7.28 3.42 %
Amortization of operating lease liabilities	: ($ in Thousands) Amount Nine Months Ending December 31, 2019 $ 8,330 2020 10,583 2021 9,884 2022 7,440 2023 5,297 Beyond 2023 20,110 Total lease payments 61,644 Less: interest 8,129 Present value of lease payments $ 53,516

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) - Huntington National Bank [Domain] $ in Millions	Dec. 11, 2018USD ($)branch
Business Acquisition [Line Items]
Estimate Acquired Deposits	$ 850
Estimate Acquired Loans	$ 134
Estimate Acquired Net Branches | branch	14

Summary of Significant Accoun_3

Summary of Significant Accounting Policies textuals (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset	$ 49,372	$ 52,000
Operating lease liability	$ 53,516	$ 56,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Calculations for basic and diluted earnings per common share
Net income	$ 86,686	$ 69,456
Preferred stock dividends	(3,801)	(2,339)
Net income available to common equity	82,885	67,117
Common shareholder dividends	(28,080)	(25,572)
Unvested share-based payment awards	(103)	(138)
Undistributed earnings	54,702	41,407
Undistributed earnings allocated to common shareholders	54,410	41,225
Undistributed earnings allocated to unvested share-based payment awards	292	182
Undistributed earnings	54,702	41,407
Basic
Distributed earnings to common shareholders	28,080	25,572
Undistributed earnings allocated to common shareholders	54,410	41,225
Total common shareholders earnings, basic	82,490	66,797
Diluted
Distributed earnings to common shareholders	28,080	25,572
Undistributed earnings allocated to common shareholders	54,410	41,225
Total common shareholders earnings, diluted	$ 82,490	$ 66,797
Weighted average common shares outstanding	163,928	163,520
Effect of dilutive common stock awards	1,505	2,038
Effect of dilutive common stock warrants	0	874
Diluted weighted average common shares outstanding	165,433	166,432
Basic earnings per common share	$ 0.50	$ 0.41
Diluted earnings per common share	$ 0.50	$ 0.40

Earnings Per Common Share (De_2

Earnings Per Common Share (Details Textuals) - shares shares in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Approximate anti-dilutive stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3	1

Stock-Based Compensation Fair V

Stock-Based Compensation Fair Value Assumptions of Stock Options (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Dividend yield	3.30%	2.50%
Risk-free interest rate	2.60%	2.60%
Weighted average expected volatility	24.00%	22.00%
Weighted average expected life	5 years 9 months	5 years 9 months
Weighted average per share fair value of options	$ 4	$ 4.47

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	5,281
Granted	1,050
Exercised	(355)
Forfeited or expired	(72)
Stock Options Shares Outstanding, Ending balance (in shares)	5,905	5,281
Options exercisable (in shares)	3,691
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)	$ 19.09
Granted, Weighted Average Exercise Price	22.77
Exercised, Weighted Average Exercise Price	15.61
Forfeited or expired, Weighted Average Exercise Price	23.46
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	19.91	$ 19.09
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 18.01
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months 25 days	6 years 2 months 4 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 6 months 3 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 15,870	$ 12,392
Options exercisable, Aggregate Intrinsic Value	$ 14,953

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Beginning balance (in shares) | shares	1,993
Granted | shares	1,153
Vested | shares	(618)
Forfeited | shares	(18)
Outstanding Shares, Ending balance (in shares) | shares	2,510
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	$ 21.92
Granted, Weighted Average Grant Date Fair Value | $ / shares	22.21
Vested, Weighted Average Grant Date Fair Value | $ / shares	20.32
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	23.67
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 22.43

Stock-Based Compensation (Detai

Stock-Based Compensation (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Intrinsic value of stock options exercised	$ 2	$ 5
Total fair value of vested stock options	$ 4	$ 3
Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
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
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years	4 years
Performance-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting of stock options	$ 1	$ 1
Recognized compensation expense for accelerated vesting of stock options	less than $1 million
Unvested share-based payment awards	$ 7
Remaining requisite service periods, extend through	first quarter 2023
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting of stock options	$ 8	$ 3
Unvested share-based payment awards	$ 33
Remaining requisite service periods, extend through	first quarter 2023
Recognized compensation expense for accelerated vesting of restricted stock options	$ 2

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment securities available for sale:
Amortized Cost	$ 3,895,540	$ 4,041,902
Gross Unrealized Gains	4,013	3,649
Gross Unrealized Losses	(70,164)	(98,610)
Fair Value	3,829,388	3,946,941
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	2,846,689	2,740,511
Held-to-maturity, Gross Unrealized Gains	48,291	17,593
Held-to-maturity, Gross Unrealized Loss	(26,109)	(47,835)
Held-to-maturity, Fair Value	2,868,870	2,710,271
US Treasury Securities
Investment securities available for sale:
Amortized Cost		1,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Fair Value		999
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	999
Held-to-maturity, Gross Unrealized Gains	8
Held-to-maturity, Gross Unrealized Loss	0
Held-to-maturity, Fair Value	1,007
Obligations of state and political subdivisions (municipal securities)
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	1,922,792	1,790,683
Held-to-maturity, Gross Unrealized Gains	39,043	8,255
Held-to-maturity, Gross Unrealized Loss	(1,349)	(15,279)
Held-to-maturity, Fair Value	1,960,487	1,783,659
Residential Related Securities | FNMA/FHLMC
Investment securities available for sale:
Amortized Cost	242,921	296,296
Gross Unrealized Gains	1,607	2,466
Gross Unrealized Losses	(2,453)	(3,510)
Fair Value	242,074	295,252
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	91,003	92,788
Held-to-maturity, Gross Unrealized Gains	413	169
Held-to-maturity, Gross Unrealized Loss	(601)	(1,795)
Held-to-maturity, Fair Value	90,815	91,162
Residential Related Securities | GNMA
Investment securities available for sale:
Amortized Cost	2,060,377	2,169,943
Gross Unrealized Gains	727	473
Gross Unrealized Losses	(23,004)	(41,885)
Fair Value	2,038,100	2,128,531
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	339,742	351,606
Held-to-maturity, Gross Unrealized Gains	1,714	1,611
Held-to-maturity, Gross Unrealized Loss	(3,314)	(8,181)
Held-to-maturity, Fair Value	338,141	345,035
Private-label
Investment securities available for sale:
Amortized Cost	877	1,007
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	(4)
Fair Value	878	1,003
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	0
Held-to-maturity, Fair Value	0
Commercial mortgage-related securities | FNMA/FHLMC
Investment securities available for sale:
Amortized Cost	20,309
Gross Unrealized Gains	346
Gross Unrealized Losses	0
Fair Value	20,655
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	0
Held-to-maturity, Fair Value	0
Commercial mortgage-related securities | GNMA
Investment securities available for sale:
Amortized Cost	1,291,892	1,273,309
Gross Unrealized Gains	402	0
Gross Unrealized Losses	(44,512)	(52,512)
Fair Value	1,247,782	1,220,797
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	492,154	505,434
Held-to-maturity, Gross Unrealized Gains	7,112	7,559
Held-to-maturity, Gross Unrealized Loss	(20,846)	(22,579)
Held-to-maturity, Fair Value	478,421	490,414
FFELP asset backed securities
Investment securities available for sale:
Amortized Cost	276,164	297,347
Gross Unrealized Gains	931	711
Gross Unrealized Losses	(195)	(698)
Fair Value	276,899	297,360
Debt Securities, Held-to-maturity
Held to Maturity, Amortized Cost	0
Held-to-maturity, Fair Value	0
Other Debt securities
Investment securities available for sale:
Amortized Cost	3,000	3,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	3,000	3,000
Investment Securities Class
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities	$ 3,600,000	$ 3,000,000

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Available for Sale, Due in one year or less	$ 1,000
Available for Sale, Due after one year through five years	2,000
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	3,000
Available for Sale, amortized cost	3,895,540	$ 4,041,902
Fair Value
Available for Sale, Due in one year or less	1,000
Available for Sale, Due after one year through five years	2,000
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	3,000
Investment securities available for sale, at fair value	$ 3,829,388	3,946,941
Available for Sale, Ratio of Fair Value to Amortized Cost	98.30%
Amortized Cost
Held to Maturity, Due in one year or less	$ 46,085
Held to Maturity, Due after one year through five years	190,810
Held to Maturity, Due after five years through ten years	444,710
Held to Maturity, Due after ten years	1,242,186
Held to Maturity, Total Debt Securities	1,923,790
Held to Maturity, Amortized Cost	2,846,689	2,740,511
Fair Value
Held to Maturity, Due in one year or less	46,262
Held to Maturity, Due after one year through five years	191,172
Held to Maturity, Due after five years through ten years	450,417
Held to Maturity, Due after ten years	1,273,642
Held to Maturity, Securities, Debt Securities	1,961,493
Held to Maturity, Total debt securities at fair value	$ 2,868,870	2,710,271
Held to Maturity, Ratio of Fair Value to Amortized Cost	100.80%
Private-label
Amortized Cost
Available for Sale, amortized cost	$ 877	1,007
Fair Value
Investment securities available for sale, at fair value	878	1,003
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
FFELP asset backed securities
Amortized Cost
Available for Sale, amortized cost	276,164	297,347
Fair Value
Investment securities available for sale, at fair value	276,899	297,360
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
FNMA/FHLMC | Residential Related Securities
Amortized Cost
Available for Sale, amortized cost	242,921	296,296
Fair Value
Investment securities available for sale, at fair value	242,074	295,252
Amortized Cost
Held to Maturity, Amortized Cost	91,003	92,788
Fair Value
Held to Maturity, Total debt securities at fair value	90,815	91,162
FNMA/FHLMC | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost	20,309
Fair Value
Investment securities available for sale, at fair value	20,655
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
GNMA | Residential Related Securities
Amortized Cost
Available for Sale, amortized cost	2,060,377	2,169,943
Fair Value
Investment securities available for sale, at fair value	2,038,100	2,128,531
Amortized Cost
Held to Maturity, Amortized Cost	339,742	351,606
Fair Value
Held to Maturity, Total debt securities at fair value	338,141	345,035
GNMA | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost	1,291,892	1,273,309
Fair Value
Investment securities available for sale, at fair value	1,247,782	1,220,797
Amortized Cost
Held to Maturity, Amortized Cost	492,154	505,434
Fair Value
Held to Maturity, Total debt securities at fair value	$ 478,421	$ 490,414

Investment Securities Gain_Loss

Investment Securities Gain/Loss Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Gross gains on available for sale securities	$ 1,680	$ 0
Gross gains on held to maturity securities	0	0
Total gains	1,680	0
Gross losses on available for sale securities	0	0
Gross losses on held to maturity securities	0	0
Total losses	0	0
Investment securities gains (losses), net	1,680	0
Proceeds from sales of investment securities	$ 131,122	$ 452,867

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2019USD ($)security	Dec. 31, 2018USD ($)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	$ (1,959)	$ (5,262)
Unrealized losses on available for sale securities, 12 months or more	(68,205)	(93,347)
Total unrealized losses on available for sale securities	(70,164)	(98,610)
Fair value of unrealized losses on available for sale securities, less than 12 months	245,744	613,612
Fair value of unrealized losses on available for sale securities, 12 months or more	3,030,042	3,009,417
Total fair value of unrealized losses on available for sale securities	$ 3,275,786	$ 3,623,028
Available for sale, number of securities, less than 12 months | security	28	41
Available for sale, number of securities, 12 months or more | security	182	190
Held-to-maturity Securities Continuous Unrealized Loss Position
Unrealized losses on held to maturity securities, less than 12 months	$ (16)	$ (4,053)
Unrealized losses on held to maturity securities, 12 months or more	(26,093)	(43,780)
Total unrealized losses on held to maturity securities	$ (26,109)	$ (47,835)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	303	865
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 7,264	$ 390,929
Fair value of unrealized losses on held to maturity securities, 12 months or more	950,613	1,349,063
Total fair value of unrealized losses on held to maturity securities	$ 957,877	$ 1,739,992
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	8	298
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		(1)
Total unrealized losses on available for sale securities		(1)
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		999
Total fair value of unrealized losses on available for sale securities		$ 999
Available for sale, number of securities, less than 12 months | security		0
Available for sale, number of securities, 12 months or more | security		1
Obligations of state and political subdivisions (municipal securities)
Held-to-maturity Securities Continuous Unrealized Loss Position
Unrealized losses on held to maturity securities, less than 12 months	$ (13)	$ (2,860)
Unrealized losses on held to maturity securities, 12 months or more	(1,336)	(12,419)
Total unrealized losses on held to maturity securities	(1,349)	(15,279)
Fair value of unrealized losses on held to maturity securities, less than 12 months	5,599	313,212
Fair value of unrealized losses on held to maturity securities, 12 months or more	136,727	509,374
Total fair value of unrealized losses on held to maturity securities	$ 142,326	$ 822,586
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	7	272
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	193	752
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		$ (4)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(4)
Fair value of unrealized losses on available for sale securities, less than 12 months		1,003
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		$ 1,003
Available for sale, number of securities, less than 12 months | security		1
Available for sale, number of securities, 12 months or more | security		0
FFELP asset backed 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	$ (195)	$ (698)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(195)	(698)
Fair value of unrealized losses on available for sale securities, less than 12 months	128,657	142,432
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	$ 128,657	$ 142,432
Available for sale, number of securities, less than 12 months | security	10	13
Available for sale, number of securities, 12 months or more | security	0	0
FNMA/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	$ (5)	$ (31)
Unrealized losses on available for sale securities, 12 months or more	(2,448)	(3,479)
Total unrealized losses on available for sale securities	(2,453)	(3,510)
Fair value of unrealized losses on available for sale securities, less than 12 months	6,468	17,993
Fair value of unrealized losses on available for sale securities, 12 months or more	172,018	189,405
Total fair value of unrealized losses on available for sale securities	$ 178,486	$ 207,398
Available for sale, number of securities, less than 12 months | security	9	15
Available for sale, number of securities, 12 months or more | security	17	17
Held-to-maturity Securities Continuous Unrealized Loss Position
Unrealized losses on held to maturity securities, less than 12 months	$ (3)	$ (780)
Unrealized losses on held to maturity securities, 12 months or more	(598)	(1,015)
Total unrealized losses on held to maturity securities	(601)	(1,795)
Fair value of unrealized losses on held to maturity securities, less than 12 months	1,664	57,896
Fair value of unrealized losses on held to maturity securities, 12 months or more	51,691	28,888
Total fair value of unrealized losses on held to maturity securities	$ 53,356	$ 86,784
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	1	13
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	22	22
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	$ (1,760)	$ (4,529)
Unrealized losses on available for sale securities, 12 months or more	(21,245)	(37,355)
Total unrealized losses on available for sale securities	(23,004)	(41,885)
Fair value of unrealized losses on available for sale securities, less than 12 months	110,619	452,183
Fair value of unrealized losses on available for sale securities, 12 months or more	1,660,128	1,598,159
Total fair value of unrealized losses on available for sale securities	$ 1,770,747	$ 2,050,342
Available for sale, number of securities, less than 12 months | security	9	12
Available for sale, number of securities, 12 months or more | security	73	79
Held-to-maturity Securities Continuous Unrealized Loss Position
Unrealized losses on held to maturity securities, less than 12 months	$ 0	$ (414)
Unrealized losses on held to maturity securities, 12 months or more	(3,314)	(7,767)
Total unrealized losses on held to maturity securities	(3,314)	(8,181)
Fair value of unrealized losses on held to maturity securities, less than 12 months	0	19,822
Fair value of unrealized losses on held to maturity securities, 12 months or more	283,774	320,387
Total fair value of unrealized losses on held to maturity securities	$ 283,774	$ 340,209
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	0	13
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	63	66
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	$ 0	$ 0
Unrealized losses on available for sale securities, 12 months or more	(44,512)	(52,512)
Total unrealized losses on available for sale securities	(44,512)	(52,512)
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	1,197,896	1,220,854
Total fair value of unrealized losses on available for sale securities	$ 1,197,896	$ 1,220,854
Available for sale, number of securities, less than 12 months | security	0	0
Available for sale, number of securities, 12 months or more | security	92	93
Held-to-maturity Securities Continuous Unrealized Loss Position
Unrealized losses on held to maturity securities, less than 12 months	$ 0	$ 0
Unrealized losses on held to maturity securities, 12 months or more	(20,846)	(22,579)
Total unrealized losses on held to maturity securities	(20,846)	(22,579)
Fair value of unrealized losses on held to maturity securities, less than 12 months	0	0
Fair value of unrealized losses on held to maturity securities, 12 months or more	478,421	490,414
Total fair value of unrealized losses on held to maturity securities	$ 478,421	$ 490,414
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	0	0
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Held-to-maturity Securities Continuous Unrealized Loss Position
Number of held to maturity securities in a continuous unrealized loss position | security	25	25

Investment Securities (Details

Investment Securities (Details Textual) - USD ($) shares in Thousands, $ in Thousands	Feb. 01, 2018	Mar. 31, 2019	Dec. 31, 2018
Investment Securities (Textuals) [Abstract]
Available-for-sale Securities, Equity Securities		$ 2,000	$ 2,000
Visa Restricted Stock Owned		119
Federal Home Loan Bank Stock		$ 139,000	173,000
Federal Reserve Bank Stock		77,000	77,000
Bank Mutual
Business Acquisition [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value	$ 453,000
Investment Securities Class
Investment Securities (Textuals) [Abstract]
Pledged Financial Instruments, Not Separately Reported, Securities		$ 3,600,000	$ 3,000,000

Loans Composition (Details)

Loans Composition (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 23,148,359	$ 22,940,429
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,587,597	7,398,044
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans	932,393	920,443
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	8,519,990	8,318,487
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Total loans	3,809,253	3,751,554
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,273,782	1,335,031
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	5,083,035	5,086,585
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	13,603,025	13,405,072
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans	8,323,846	8,277,712
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	868,886	894,473
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	352,602	363,171
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	9,545,333	9,535,357
Bank Mutual
Loans and Leases Receivable Disclosure [Line Items]
Purchased credit-impaired loans	$ 5,000	$ 5,000

Loans Credit Quality Indicator

Loans Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 23,148,359	$ 22,940,429
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	22,662,534	22,438,605
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	88,912	123,988
Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	241,357	249,935
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	155,556	127,901
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	7,587,597	7,398,044
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	7,371,790	7,162,370
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	30,657	78,075
Commercial and industrial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	111,772	116,578
Commercial and industrial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	73,379	41,021
Commercial real estate — owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans	932,393	920,443
Commercial real estate — owner occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	874,152	854,265
Commercial real estate — owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	8,422	6,257
Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	48,929	55,964
Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	890	3,957
Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Loans	8,519,990	8,318,487
Commercial and business lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	8,245,942	8,016,635
Commercial and business lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	39,079	84,332
Commercial and business lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	160,701	172,542
Commercial and business lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	74,269	44,978
Commercial real estate — investor
Financing Receivable, Recorded Investment [Line Items]
Loans	3,809,253	3,751,554
Commercial real estate — investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	3,698,679	3,653,642
Commercial real estate — investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	39,184	28,479
Commercial real estate — investor | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	70,613	67,481
Commercial real estate — investor | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	776	1,952
Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans	1,273,782	1,335,031
Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,259,661	1,321,447
Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	8,782	8,771
Real estate construction | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	4,600	3,834
Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	739	979
Commercial real estate lending
Financing Receivable, Recorded Investment [Line Items]
Loans	5,083,035	5,086,585
Commercial real estate lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	4,958,341	4,975,089
Commercial real estate lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	47,966	37,249
Commercial real estate lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	75,213	71,315
Commercial real estate lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	1,516	2,931
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	13,603,025	13,405,072
Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	13,204,282	12,991,724
Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	87,045	121,582
Total commercial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	235,914	243,856
Total commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	75,784	47,909
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	8,323,846	8,277,712
Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	8,250,915	8,203,729
Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	256	434
Residential mortgage | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	5,351	5,975
Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	67,323	67,574
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans	868,886	894,473
Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	855,603	880,808
Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	891	1,223
Home equity | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	91	103
Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	12,300	12,339
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	352,602	363,171
Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	351,734	362,343
Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	719	749
Other consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	149	79
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	9,545,333	9,535,357
Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	9,458,252	9,446,881
Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,866	2,406
Total consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans	5,443	6,078
Total consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 79,772	$ 79,992

Loans Past Due Status (Details)

Loans Past Due Status (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Summarized details of Loans
Current	$ 22,951,360	$ 22,785,019
Nonaccrual	155,556	127,901
Total loans	23,148,359	22,940,429
Nonaccrual Loans, Current Portion	$ 106,000	$ 74,000
Percent of current nonaccrual loans	68.00%	58.00%
30-59 Days Past Due
Summarized details of Loans
Total Past Due	$ 36,663	$ 21,550
60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,562	3,795
90 Days or More Past Due
Summarized details of Loans
Total Past Due	2,218	2,165
Commercial and industrial
Summarized details of Loans
Current	7,510,637	7,356,187
Nonaccrual	73,379	41,021
Total loans	7,587,597	7,398,044
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,902	187
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	392	338
Commercial and industrial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	287	311
Commercial real estate — owner occupied
Summarized details of Loans
Current	925,437	913,787
Nonaccrual	890	3,957
Total loans	932,393	920,443
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,066	2,580
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	119
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	8,436,074	8,269,974
Nonaccrual	74,269	44,978
Total loans	8,519,990	8,318,487
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	8,968	2,767
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	392	457
Commercial and business lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	287	311
Commercial real estate — investor
Summarized details of Loans
Current	3,807,387	3,745,835
Nonaccrual	776	1,952
Total loans	3,809,253	3,751,554
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,090	2,954
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	813
Commercial real estate — investor | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Real estate construction
Summarized details of Loans
Current	1,266,270	1,333,722
Nonaccrual	739	979
Total loans	1,273,782	1,335,031
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,727	330
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	46	0
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	5,073,657	5,079,557
Nonaccrual	1,516	2,931
Total loans	5,083,035	5,086,585
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	7,816	3,284
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	46	813
Commercial real estate lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Total commercial
Summarized details of Loans
Current	13,509,731	13,349,531
Nonaccrual	75,784	47,909
Total loans	13,603,025	13,405,072
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	16,785	6,051
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	439	1,270
Total commercial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	287	311
Residential mortgage
Summarized details of Loans
Current	8,243,248	8,200,432
Nonaccrual	67,323	67,574
Total loans	8,323,846	8,277,712
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	13,018	9,272
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	256	434
Residential mortgage | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Home equity
Summarized details of Loans
Current	850,223	876,085
Nonaccrual	12,300	12,339
Total loans	868,886	894,473
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	5,472	4,826
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	891	1,223
Home equity | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Other consumer
Summarized details of Loans
Current	348,158	358,970
Nonaccrual	149	79
Total loans	352,602	363,171
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,389	1,401
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	975	868
Other consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,931	1,853
Total consumer
Summarized details of Loans
Current	9,441,629	9,435,487
Nonaccrual	79,772	79,992
Total loans	9,545,333	9,535,357
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	19,879	15,499
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,123	2,525
Total consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,931	$ 1,853

Loans, Impaired Loans Recorded

Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 159,763	$ 133,690
Unpaid Principal Balance	187,705	164,766
Related Allowance	20,684	15,304
Average Recorded Investment	119,935	145,707
Interest Income Recognized	$ 2,732	$ 3,626
Net Recorded Investment of the Impaired Loans	74.00%	72.00%
Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 107,228	$ 96,609
Unpaid Principal Balance	115,307	102,483
Related Allowance	20,684	15,304
Average Recorded Investment	94,072	110,079
Interest Income Recognized	1,025	3,699
Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	52,535	37,081
Unpaid Principal Balance	72,399	62,283
Related Allowance	0	0
Average Recorded Investment	25,863	35,627
Interest Income Recognized	1,708	73
Commercial and industrial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	87,798	63,153
Unpaid Principal Balance	109,873	87,155
Related Allowance	10,876	5,721
Average Recorded Investment	52,184	73,813
Interest Income Recognized	1,974	823
Commercial and industrial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	44,810	40,747
Unpaid Principal Balance	48,448	42,131
Related Allowance	10,876	5,721
Average Recorded Investment	36,288	52,461
Interest Income Recognized	317	1,167
Commercial and industrial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	42,988	22,406
Unpaid Principal Balance	61,425	45,024
Related Allowance	0	0
Average Recorded Investment	15,896	21,352
Interest Income Recognized	1,657	344
Commercial real estate — owner occupied
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	2,834	5,852
Unpaid Principal Balance	2,851	6,910
Related Allowance	50	24
Average Recorded Investment	2,122	6,154
Interest Income Recognized	30	104
Commercial real estate — owner occupied | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	2,104	2,080
Unpaid Principal Balance	2,111	2,087
Related Allowance	50	24
Average Recorded Investment	2,122	2,179
Interest Income Recognized	27	104
Commercial real estate — owner occupied | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	730	3,772
Unpaid Principal Balance	740	4,823
Related Allowance	0	0
Average Recorded Investment	0	3,975
Interest Income Recognized	3	0
Commercial and business lending
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	90,632	69,005
Unpaid Principal Balance	112,724	94,065
Related Allowance	10,926	5,745
Average Recorded Investment	54,307	79,967
Interest Income Recognized	2,004	927
Commercial and business lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	46,914	42,827
Unpaid Principal Balance	50,559	44,218
Related Allowance	10,926	5,745
Average Recorded Investment	38,411	54,640
Interest Income Recognized	344	1,271
Commercial and business lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	43,718	26,178
Unpaid Principal Balance	62,166	49,847
Related Allowance	0	0
Average Recorded Investment	15,896	25,327
Interest Income Recognized	1,660	344
Commercial real estate — investor
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	2,335	2,384
Unpaid Principal Balance	3,604	3,625
Related Allowance	26	28
Average Recorded Investment	2,351	1,807
Interest Income Recognized	17	106
Commercial real estate — investor | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,700	799
Unpaid Principal Balance	1,799	805
Related Allowance	26	28
Average Recorded Investment	792	827
Interest Income Recognized	17	38
Commercial real estate — investor | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	635	1,585
Unpaid Principal Balance	1,805	2,820
Related Allowance	0	0
Average Recorded Investment	1,559	980
Interest Income Recognized	0	68
Real estate construction
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	498	510
Unpaid Principal Balance	578	589
Related Allowance	69	75
Average Recorded Investment	502	533
Interest Income Recognized	9	32
Real estate construction | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	498	510
Unpaid Principal Balance	578	589
Related Allowance	69	75
Average Recorded Investment	502	533
Interest Income Recognized	9	32
Real estate construction | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
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
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	2,833	2,894
Unpaid Principal Balance	4,182	4,214
Related Allowance	94	103
Average Recorded Investment	2,852	2,340
Interest Income Recognized	25	138
Commercial real estate lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	2,198	1,309
Unpaid Principal Balance	2,377	1,394
Related Allowance	94	103
Average Recorded Investment	1,293	1,360
Interest Income Recognized	25	70
Commercial real estate lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	635	1,585
Unpaid Principal Balance	1,805	2,820
Related Allowance	0	0
Average Recorded Investment	1,559	980
Interest Income Recognized	0	68
Total commercial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	93,465	71,899
Unpaid Principal Balance	116,906	98,279
Related Allowance	11,021	5,848
Average Recorded Investment	57,159	82,307
Interest Income Recognized	2,029	1,065
Total commercial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	49,112	44,136
Unpaid Principal Balance	52,936	45,612
Related Allowance	11,021	5,848
Average Recorded Investment	39,704	56,000
Interest Income Recognized	369	1,341
Total commercial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	44,353	27,763
Unpaid Principal Balance	63,970	52,667
Related Allowance	0	0
Average Recorded Investment	17,455	26,307
Interest Income Recognized	1,660	276
Residential mortgage
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	54,348	50,486
Unpaid Principal Balance	57,824	54,223
Related Allowance	6,197	6,023
Average Recorded Investment	51,079	51,477
Interest Income Recognized	574	1,992
Residential mortgage | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	46,165	41,691
Unpaid Principal Balance	49,395	45,149
Related Allowance	6,197	6,023
Average Recorded Investment	43,194	42,687
Interest Income Recognized	527	1,789
Residential mortgage | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	8,182	8,795
Unpaid Principal Balance	8,429	9,074
Related Allowance	0	0
Average Recorded Investment	7,885	8,790
Interest Income Recognized	48	203
Home equity
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	10,792	10,124
Unpaid Principal Balance	11,815	11,081
Related Allowance	3,348	3,312
Average Recorded Investment	10,538	10,739
Interest Income Recognized	128	566
Home equity | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	10,792	9,601
Unpaid Principal Balance	11,815	10,539
Related Allowance	3,348	3,312
Average Recorded Investment	10,015	10,209
Interest Income Recognized	128	566
Home equity | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	0	523
Unpaid Principal Balance	0	542
Related Allowance	0	0
Average Recorded Investment	523	530
Interest Income Recognized	0	0
Other consumer
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,158	1,181
Unpaid Principal Balance	1,161	1,183
Related Allowance	119	121
Average Recorded Investment	1,159	1,184
Interest Income Recognized	0	3
Other consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,158	1,181
Unpaid Principal Balance	1,161	1,183
Related Allowance	119	121
Average Recorded Investment	1,159	1,184
Interest Income Recognized	0	3
Other consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
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
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	66,298	61,791
Unpaid Principal Balance	70,799	66,487
Related Allowance	9,664	9,456
Average Recorded Investment	62,776	63,400
Interest Income Recognized	703	2,561
Total consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	58,116	52,473
Unpaid Principal Balance	62,370	56,871
Related Allowance	9,664	9,456
Average Recorded Investment	54,368	54,080
Interest Income Recognized	655	2,358
Total consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	8,182	9,318
Unpaid Principal Balance	8,429	9,616
Related Allowance	0	0
Average Recorded Investment	8,408	9,320
Interest Income Recognized	$ 48	$ 203

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 46,548	$ 53,263
Nonaccrual Restructured Loans	24,172	26,292
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	15,443	25,478
Nonaccrual Restructured Loans	107	249
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	2,026	2,080
Nonaccrual Restructured Loans	78	0
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,700	799
Nonaccrual Restructured Loans	0	933
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	311	311
Nonaccrual Restructured Loans	187	198
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	18,226	16,036
Nonaccrual Restructured Loans	21,549	22,279
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,688	7,385
Nonaccrual Restructured Loans	2,247	2,627
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,154	1,174
Nonaccrual Restructured Loans	$ 5	$ 6

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	40	33
Recorded Investment	$ 4,739	$ 3,958
Unpaid Principal Balance	$ 4,776	$ 4,007
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	2
Recorded Investment	$ 0	$ 92
Unpaid Principal Balance	$ 0	$ 92
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Recorded Investment	$ 78	$ 0
Unpaid Principal Balance	$ 78	$ 0
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Recorded Investment	$ 0	$ 1,007
Unpaid Principal Balance	$ 0	$ 1,037
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	25	11
Recorded Investment	$ 4,357	$ 1,807
Unpaid Principal Balance	$ 4,374	$ 1,807
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	13	17
Recorded Investment	$ 293	$ 1,044
Unpaid Principal Balance	$ 312	$ 1,060
Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	2
Recorded Investment	$ 11	$ 8
Unpaid Principal Balance	$ 11	$ 11

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	12	16
Recorded Investment | $	$ 790	$ 1,421
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	4
Recorded Investment | $	$ 613	$ 467
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	12
Recorded Investment | $	$ 177	$ 954

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	$ 238,023	$ 265,880
Charge offs	(15,486)	(50,536)
Recoveries	8,044	20,179
Net Charge offs	(7,442)	(30,358)
Provision for loan losses	4,500	2,500
Balance at end of period	235,081	238,023
Allowance for loan losses:
Individually evaluated			$ 20,684	$ 15,304
Collectively evaluated			214,396	222,719
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	235,081	265,880	235,081	238,023
Loans:
Individually evaluated			159,763	133,690
Collectively evaluated			22,983,688	22,801,887
Acquired and accounted for under ASC 310-30			4,907	4,853
Total loans			23,148,359	22,940,429
Commercial and industrial
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	108,835	123,068
Charge offs	(13,216)	(30,837)
Recoveries	5,788	13,714
Net Charge offs	(7,428)	(17,123)
Provision for loan losses	7,525	2,890
Balance at end of period	108,933	108,835
Allowance for loan losses:
Individually evaluated			10,876	5,721
Collectively evaluated			98,057	103,114
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	108,933	123,068	108,933	108,835
Loans:
Individually evaluated			87,798	63,153
Collectively evaluated			7,496,743	7,331,898
Acquired and accounted for under ASC 310-30			3,057	2,994
Total loans			7,587,597	7,398,044
Commercial real estate — owner occupied
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	9,255	10,352
Charge offs	0	(1,363)
Recoveries	1,193	639
Net Charge offs	1,193	(724)
Provision for loan losses	131	(373)
Balance at end of period	10,579	9,255
Allowance for loan losses:
Individually evaluated			50	24
Collectively evaluated			10,529	9,231
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	9,255	9,255	10,579	9,255
Loans:
Individually evaluated			2,834	5,852
Collectively evaluated			928,723	913,708
Acquired and accounted for under ASC 310-30			836	883
Total loans			932,393	920,443
Commercial real estate — investor
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	40,844	41,059
Charge offs	0	(7,914)
Recoveries	31	668
Net Charge offs	31	(7,246)
Provision for loan losses	289	7,031
Balance at end of period	41,164	40,844
Allowance for loan losses:
Individually evaluated			26	28
Collectively evaluated			41,138	40,816
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	41,164	41,059	41,164	40,844
Loans:
Individually evaluated			2,335	2,384
Collectively evaluated			3,806,635	3,748,883
Acquired and accounted for under ASC 310-30			283	287
Total loans			3,809,253	3,751,554
Real estate construction
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	28,240	34,370
Charge offs	(52)	(298)
Recoveries	52	446
Net Charge offs	0	149
Provision for loan losses	(1,326)	(6,279)
Balance at end of period	26,914	28,240
Allowance for loan losses:
Individually evaluated			69	75
Collectively evaluated			26,845	28,165
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	28,240	28,240	26,914	28,240
Loans:
Individually evaluated			498	510
Collectively evaluated			1,273,267	1,334,500
Acquired and accounted for under ASC 310-30			18	21
Total loans			1,273,782	1,335,031
Residential mortgage
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	25,595	29,607
Charge offs	(652)	(1,627)
Recoveries	195	1,271
Net Charge offs	(457)	(355)
Provision for loan losses	(1,567)	(3,657)
Balance at end of period	23,571	25,595
Allowance for loan losses:
Individually evaluated			6,197	6,023
Collectively evaluated			17,373	19,572
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	25,595	25,595	23,571	25,595
Loans:
Individually evaluated			54,347	50,486
Collectively evaluated			8,268,834	8,226,642
Acquired and accounted for under ASC 310-30			664	584
Total loans			8,323,846	8,277,712
Home equity
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	19,266	22,126
Charge offs	(254)	(3,236)
Recoveries	563	2,628
Net Charge offs	309	(608)
Provision for loan losses	(1,639)	(2,252)
Balance at end of period	17,936	19,266
Allowance for loan losses:
Individually evaluated			3,348	3,312
Collectively evaluated			14,588	15,954
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	17,936	22,126	17,936	19,266
Loans:
Individually evaluated			10,793	10,124
Collectively evaluated			858,044	884,266
Acquired and accounted for under ASC 310-30			49	83
Total loans			868,886	894,473
Other consumer
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of period	5,988	5,298
Charge offs	(1,312)	(5,261)
Recoveries	222	812
Net Charge offs	(1,090)	(4,448)
Provision for loan losses	1,087	5,138
Balance at end of period	5,984	5,988
Allowance for loan losses:
Individually evaluated			119	121
Collectively evaluated			5,866	5,867
Acquired and accounted for under ASC 310-30			0	0
Total allowance for loan losses	$ 5,984	$ 5,298	5,984	5,988
Loans:
Individually evaluated			1,158	1,181
Collectively evaluated			351,443	361,990
Acquired and accounted for under ASC 310-30			0	0
Total loans			$ 352,602	$ 363,171

Loans, Changes in the Allowan_2

Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
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	24,336	24,400
Provision for unfunded commitments	1,500	(2,500)
Amount recorded at acquisition	0	2,436
Balance at end of period	$ 25,836	$ 24,336

Loans Changes to Accretable Yie

Loans Changes to Accretable Yield (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 1,482	$ 0
Purchases	0	4,853
Accretion	(221)	(4,954)
Net reclassification from non-accretable yield	23	1,605
Other	0	(22)
Balance at end of period	$ 1,285	$ 1,482

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Receivables [Abstract]
Recorded Investment, loans modified in troubled debt restructuring	$ 4,739	$ 3,958
Restructured Loans Subsequently Accruing	1,000
Ytd Restructured Loans Still On Nonaccrual	4,000
Net unaccreted purchase discount	18,000
Unaccreted purchase discount, performing loans	16,000
Unaccreted purchase discount, nonperforming loans	2,000
Bank Mutual
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchased credit-impaired loans	$ 5,000		$ 5,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 2,226	$ 1,525
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	58,100		$ 58,100
Accumulated amortization	(6,778)		(5,326)
Net Book Value	51,322		52,774
Amortization of other intangible assets	1,453		5,326
Additions to Core Deposits
Summary of core deposit intangibles and other intangibles
Additions during the period	0		58,100
Other Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	44,887		44,931
Reductions due to sale	0		(43)
Accumulated amortization	(22,599)		(21,825)
Net Book Value	22,288		23,062
Additions during the period	0		10,359
Amortization of other intangible assets	$ 774		$ 2,833

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Mortgage servicing rights:
Mortgage servicing rights at beginning of period		$ 68,433	$ 59,168
MSR Addition from Business Combination		0	8,136
Additions		1,247	10,722
Amortization		(2,693)	(9,594)
Mortgage servicing rights at end of period		66,987	68,433
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period		(239)	(784)
(Additions) recoveries, net		(121)	545
Valuation allowance at end of period		(360)	(239)
Mortgage servicing rights, net		66,626	68,193
Fair value of mortgage servicing rights		73,858	81,012
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)		$ 8,543,467	$ 8,600,983
Mortgage servicing rights, net to servicing portfolio		0.78%	0.79%
Mortgage servicing rights expense	[1]	$ 2,814	$ 9,049
[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.

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Core Deposit Intangibles
Estimated future amortization expense
Nine Months Ending December 31, 2019	$ 4,358
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
Year ending December 31, 2024	5,810
Beyond 2024	17,914
Net Book Value	51,322	$ 52,774
Other Intangibles
Estimated future amortization expense
Nine Months Ending December 31, 2019	2,050
Year ending December 31, 2020	2,707
Year ending December 31, 2021	2,682
Year ending December 31, 2022	2,659
Year ending December 31, 2023	2,640
Year ending December 31, 2024	2,620
Beyond 2024	6,931
Net Book Value	22,288	$ 23,062
Mortgage Servicing Rights
Estimated future amortization expense
Nine Months Ending December 31, 2019	7,983
Year ending December 31, 2020	11,032
Year ending December 31, 2021	9,334
Year ending December 31, 2022	7,848
Year ending December 31, 2023	6,579
Year ending December 31, 2024	5,507
Beyond 2024	18,703
Net Book Value	$ 66,987

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Details Textuals) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment Loss	$ 0	$ 0
Goodwill	$ 1,168,944,000		$ 1,169,023,000

Short and Long-Term Funding (Co

Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Short-term Funding [Abstract]
Federal funds purchased	$ 13,090	$ 19,710
Securities sold under agreements to repurchase	114,008	91,941
Federal funds purchased and securities sold under agreements to repurchase	127,098	111,651
Commercial paper	32,019	45,423
Total short-term funding	159,117	157,074
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
Other long-term funding and capitalized costs	(3,993)	(4,389)
Total long-term funding	796,007	795,611
Long-term Funding
Total short and long-term funding, excluding FHLB advances	955,123	952,685
FHLB Advances
Short-term FHLB advances	20,000	900,000
Long-term FHLB advances	2,924,769	2,674,371
Total FHLB advances	2,944,769	3,574,371
Total short and long-term funding, excluding FHLB advances	3,899,893	4,527,056
Corporation senior notes [Member]
Long-Term Funding
Senior notes, at par	250,000	250,000
Bank senior notes [Member]
Long-Term Funding
Senior notes, at par	$ 300,000	$ 300,000

Short and Long-Term Funding (Re

Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 114,008	$ 91,941
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	114,008	91,941
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	114,008	91,941
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	114,008	91,941
Agency mortgage-related securities | Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | 30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 0	$ 0

Short and Long-Term Funding FHL

Short and Long-Term Funding FHLB Maturity Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 2,944,769	$ 3,574,371
FHLB Weighted Average Coupon Rate	2.71%	2.19%
FHLB Maturity within One Year [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 2,232,703	$ 2,262,584
FHLB Weighted Average Coupon Rate	2.79%	2.06%
FHLB Maturity One Year to Two Years [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 688,035	$ 1,285,039
FHLB Weighted Average Coupon Rate	2.43%	2.39%
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	$ 16,064	$ 14,393
FHLB Weighted Average Coupon Rate	3.22%	2.98%
FHLB Maturity Over Three Years [Domain]
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 7,968	$ 12,354
FHLB Weighted Average Coupon Rate	3.78%	4.55%

Short and Long-Term Funding (Lo

Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Nov. 30, 2014	Mar. 31, 2019	Dec. 31, 2018	Aug. 31, 2018
Long-Term Funding
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 2,944,769	$ 3,574,371
Subordinated Borrowing [Line Items]
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed		171,000
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%
Two Thousand Eighteen Senior Notes [Member] [Domain]
Long-Term Funding
New Senior Debt Issued				$ 300,000
Debt Instrument, Interest Rate, Stated Percentage				3.50%
Two Thousand Fourteen Senior Notes [Member]
Long-Term Funding
New Senior Debt Issued	$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	2.75%
FHLBDecreaseinAdvances [Domain]
Long-Term Funding
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		630,000
FLHB Advances, Putable [Domain]
Long-Term Funding
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 2,800,000
FHLB Short Term Advances [Member]
Long-Term Funding
FHLB Put Contractual Maturity Weighted Average Life1		8 months 8 days
FHLB Long Term Advances [Member]
Long-Term Funding
FHLB Put Contractual Maturity Weighted Average Life1		7 years 29 days

Derivative and Hedging Activi_3

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Not Designated as Hedging Instrument | Trading Assets [Member] | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 2,726,738	$ 2,707,204
Derivative, Fair Value, Net	54,479	52,796
Not Designated as Hedging Instrument | Trading Assets [Member] | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	92,285	117,879
Derivative, Fair Value, Net	1,737	721
Not Designated as Hedging Instrument | Trading Assets [Member] | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	284,655	331,727
Derivative, Fair Value, Net	21,705	35,426
Not Designated as Hedging Instrument | Trading Liabilities [Member] | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,726,738	2,707,204
Derivative, Fair Value, Net	(55,008)	(52,653)
Not Designated as Hedging Instrument | Trading Liabilities [Member] | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	103,238	69,153
Derivative, Fair Value, Net	(1,665)	(675)
Not Designated as Hedging Instrument | Trading Liabilities [Member] | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	284,656	315,861
Derivative, Fair Value, Net	(21,186)	(34,340)
Not Designated as Hedging Instrument | Other Assets [Member] | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	269,075	191,222
Derivative, Fair Value, Net	3,032	2,208
Not Designated as Hedging Instrument | Other Assets [Member] | Purchased options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	7,885	11,185
Derivative, Fair Value, Net	156	109
Not Designated as Hedging Instrument | Other liabilities | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	191,112	139,984
Derivative, Fair Value, Net	(1,825)	(2,072)
Not Designated as Hedging Instrument | Other liabilities | Written options (time deposit)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	7,885	11,185
Derivative, Fair Value, Net	(156)	(109)
Designated as Hedging Instrument | Other liabilities | interest rate product [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	500,000	500,000
Derivative, Fair Value, Net	$ (128)	$ (40)

Derivative and Hedging Activi_4

Derivative and Hedging Activities Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Recording of Fair Value Hedge [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ 77,920	$ 88,943
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)	2,000
Amortized cost basis of hedged asset	1,100,000
Carrying Value [Member] | Designated as Hedging Instrument
Balance Sheet Recording of Fair Value Hedge [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	501,555
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)	$ 1,555

Derivative and Hedging Activi_5

Derivative and Hedging Activities Income impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 166	$ (1,325)
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	2,057	(502)
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	(1,891)	(823)
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

Derivative and Hedging Activi_6

Derivative and Hedging Activities Derivative Impact on Perfomance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
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	$ (672)	$ 492
Capital Market Fees [Member] | Foreign Exchange Forward [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	26	(28)
Capital Market Fees [Member] | Commodity Contract [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(567)	164
Mortgage Banking [Member] | Interest Rate Lock Commitments [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	824	1,494
Mortgage Banking [Member] | Forward Contracts [Member]
Derivative Impact on Performance [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 247	$ 10

Derivative and Hedging Activi_7

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 35	$ 36
Derivative collateral right to reclaim cash	$ 32	$ 1

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 25,486	$ 65,596
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	25,486	65,596
Financial instruments	(24,210)	(22,873)
Collateral	(1,044)	(41,879)
Net amount	232	843
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	52,768	22,951
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	52,768	22,951
Financial instruments	(24,210)	(22,873)
Collateral	(25,889)	(63)
Net amount	$ 2,669	$ 16

Commitments, Off-Balance Shee_3

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 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	8,687,001	$ 8,720,293
Commercial Letters Of Credit
Summary of lending-related and other commitments
Lending related commitments	6,192	7,599
Standby Letters of Credit
Summary of lending-related and other commitments
Lending related commitments	256,389	255,904
Standby letters of credit, fair value	$ 2,000	$ 2,000

Commitments, Off-Balance Shee_4

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters Residential Mortgage Repurchase Reserve (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Residential mortgage repurchase reserve
Balance at beginning of period	$ 24,000
Balance at end of period	26,000	$ 24,000
Mortgage Repurchase Reserve
Residential mortgage repurchase reserve
Balance at beginning of period	752	987
Repurchase provision expense	48	345
Adjustments to provision expense	0	(450)
Charge offs, net	(70)	(218)
Amount recorded at acquisition	0	88
Balance at end of period	$ 730	$ 752

Commitments, Off-Balance Shee_5

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Unfunded Commitments	$ 26,000		$ 24,000
Expense Related to Qualified Affordable Housing Projects	5,000	$ 5,000
Remaining Investment in Qualified Affordable Housing Projects	160,000		132,000
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount	73,000		51,000
Loans Repurchased Under Make Whole Requests	$ 305		$ 2,000
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid	negligible		negligible
Loans Sold To Outside Investors Original Amount	$ 11,300,000
Loans Sold To Outside Investors Remaining Outstanding Amount	7,300,000
Residential Mortgage Loans Sold With Recourse Risk	31,000		$ 47,000
Residential Mortgage Loans Sold With Credit Recourse Risk	54,000		57,000
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	169,000		136,000
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	25,000		25,000
Standby Letters of Credit
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Lines of Credit, Fair Value Disclosure	$ 2,000		$ 2,000

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	$ 3,829,388	$ 3,946,941
Trading assets	77,920	88,943
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	77,859	87,668
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	0	999
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,829,388	3,945,943
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	3,032	2,208
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,825	2,072
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | US Treasury Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	0	999
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	1,609	1,568
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Total investment securities available for sale
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	0	999
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	2,038,100	2,128,531
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private-label
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	878	1,003
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FFELP asset backed securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	276,899	297,360
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,000	3,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,829,388	3,945,943
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Loans Held For Sale Member
Assets, Fair Value Disclosure [Abstract]
Trading assets	81,392	64,321
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial loans held for sale [Domain]
Assets, Fair Value Disclosure [Abstract]
Trading assets	15,467	14,943
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror
Assets, Fair Value Disclosure [Abstract]
Trading assets	54,479	52,796
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	55,008	52,653
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Assets, Fair Value Disclosure [Abstract]
Trading assets	1,737	721
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,665	675
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading assets	21,705	35,426
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	21,186	34,340
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)
Assets, Fair Value Disclosure [Abstract]
Trading assets	156	109
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	156	109
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage)
Assets, Fair Value Disclosure [Abstract]
Trading assets	3,032	2,208
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,825	2,072
Designated as Hedging Instrument
Assets, Fair Value Disclosure [Abstract]
Trading assets	500,000
Designated as Hedging Instrument | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Interest Rate Fair Value Hedge Derivative at Fair Value, Net	128	40
FNMA/FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	242,074	295,252
FNMA/FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	20,655	0
GNMA | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	$ 1,247,782	$ 1,220,797

Fair Value Measurements Financi

Fair Value Measurements Financial Instruments Classified Within Level 3 (Details) - Derivative Financial Instruments - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ 140	$ 1,225
Mortgage derivative loss	1,072	(1,085)
Ending Balance	$ 1,211	$ 140

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 73,858		$ 81,012
Mortgage Servicing Rights (MSR) Impairment (Recovery)	121	$ (474)
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	183		2,200
Foreclosure / OREO expense, net	(148)		(1,545)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Impaired loans	52,831		26,191
Provision for Credit Losses, Impaired Loans	(18,529)		(14,521)
Mortgage servicing rights	73,858		81,012
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ (121)		$ 545

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Unobservable Level 3 Measurements (Details) - Fair Value, Inputs, Level 3	3 Months Ended
	Mar. 31, 2019
Discounted Cash Flow | Mortgage Servicing Rights
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	12.00%
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	27.00%

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial assets
Cash and due from banks	$ 334,095	$ 507,187
Interest-bearing deposits in other financial institutions	270,843	221,226
Federal funds sold and securities purchased under agreements to resell	41,405	148,285
Debt Securities, Held-to-maturity	2,846,689	2,740,511
Investment securities held to maturity, fair value	2,868,870	2,710,271
Investment securities available for sale	3,829,388	3,946,941
Equity securities with readily determinable fair values, Fair Value	1,609	1,568
FHLB and Federal Reserve Bank stocks	216,940	250,534
Residential Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	81,392	64,321
Commercial Loans Held-for-sale, Fair Value Disclosure	15,467	14,943
Loans, net	22,913,278	22,702,406
Bank and Corporate Owned Life Insurance	665,976	663,203
Derivatives (trading assets)	77,920	88,943
Financial liabilities
Short-term funding	159,117	157,074
Other long-term funding	796,007	795,611
Derivatives (trading liabilities)	77,859	87,668
Letters of Credit Outstanding, Amount	256,000	256,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	334,095	507,187
Cash and due from banks, Fair Value	334,095	507,187
Interest-bearing deposits in other financial institutions	270,843	221,226
Interest-bearing deposits in other financial institutions, fair value	270,843	221,226
Federal funds sold and securities purchased under agreements to resell	41,405	148,285
Federal funds sold and securities purchased under agreements to resell, fair value	41,405	148,285
Debt Securities, Held-to-maturity	999	0
Investment securities held to maturity, fair value	1,007	0
Investment securities available for sale	0	999
Investment securities available for sale, fair value	0	999
Equity securities with readily determinable fair value, Carrying Amount	1,609	1,568
Equity securities with readily determinable fair values, Fair Value	1,609	1,568
Fair Value, Inputs, Level 2
Financial assets
Debt Securities, Held-to-maturity	2,845,690	2,740,511
Investment securities held to maturity, fair value	2,867,864	2,710,271
Investment securities available for sale	3,829,388	3,945,943
Investment securities available for sale, fair value	3,829,388	3,945,943
FHLB and Federal Reserve Bank stocks	216,940	250,534
FHLB and Federal Reserve Bank stocks, fair value	216,940	250,534
Residential Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	81,392	64,321
Residential Held-for-sale, Fair Value Disclosure	81,392	64,321
Commercial loans held for sale	15,467	14,943
Commercial Loans Held-for-sale, Fair Value Disclosure	15,467	14,943
Bank and Corporate Owned Life Insurance	665,976	663,203
Bank owned life insurance, fair value	665,976	663,203
Financial liabilities
Brokered CDs and other time deposits	3,751,665	2,815,401
Brokered CDs and other time deposits, fair value	3,751,665	2,815,401
Short-term funding	179,117	1,057,074
Short-term funding, fair value	179,117	1,057,074
Other long-term funding	3,720,776	3,469,982
Long-term funding, fair value	3,761,004	3,492,174
Standby letters of credit	2,478	2,482
Standby letters of credit, fair value	2,478	2,482
Fair Value, Inputs, Level 3
Financial assets
Loans, net	22,913,278	22,702,406
Loans, net, fair value	22,626,091	22,317,395
Derivatives (trading assets)	3,032	2,208
Derivatives (trading and other assets), fair value	3,032	2,208
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	21,781,392	22,081,992
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	21,781,392	22,081,992
Derivatives (trading liabilities)	1,825	2,072
Derivatives (trading and other liabilities), fair value	1,825	2,072
Trading Assets [Member] | Fair Value, Inputs, Level 2
Financial assets
Derivatives (trading assets)	77,920	88,943
Derivatives (trading and other assets), fair value	77,920	88,943
Other Assets [Member] | Fair Value, Inputs, Level 2
Financial assets
Derivatives (trading assets)	156	109
Derivatives (trading and other assets), fair value	156	109
Trading Liabilities [Member] | Fair Value, Inputs, Level 2
Financial liabilities
Derivatives (trading liabilities)	77,859	87,668
Derivatives (trading and other liabilities), fair value	77,859	87,668
Other Liabilities [Member] | Fair Value, Inputs, Level 2
Financial liabilities
Derivatives (trading liabilities)	284	149
Derivatives (trading and other liabilities), fair value	$ 284	$ 149

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals)	3 Months Ended
	Mar. 31, 2019
Fair Value Measurements (Textuals) [Abstract]
Fair Value Inputs Closing Ratio	85.00%

Retirement Plans, Components of

Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
RAP
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,925	$ 1,893
Interest cost	2,413	1,660
Expected return on plan assets	(6,075)	(4,755)
Amortization of prior service cost	(19)	(19)
Amortization of actuarial loss	65	463
Total net pension and periodic benefit cost	(1,691)	(759)
Bank Mutual Pension Plan
Net period benefit cost for the pension and postretirement plans
Interest cost		433
Expected return on plan assets		(532)
Total net pension and periodic benefit cost		(99)
Postretirement Plan
Net period benefit cost for the pension and postretirement plans
Interest cost	26	26
Amortization of prior service cost	(19)	(19)
Amortization of actuarial loss	(1)	2
Total net pension and periodic benefit cost	$ 6	$ 9

Segment Reporting (Details)

Segment Reporting (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2019USD ($)segment	Mar. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment		3
Segment Income Statement Data Abstract
Net interest income		$ 215,547	$ 209,871
Net intersegment interest income (expense)		0	0
Segment net interest income		215,547	209,871
Noninterest income		91,202	90,380
Total revenue		306,749	300,251
Credit provision		6,000	0
Noninterest Expense		191,671	212,965
Income (loss) before income taxes		109,078	87,285
Income tax expense (benefit)		22,392	17,829
Net income		86,686	69,456
Segment Balance Sheet Data
Allocated Goodwill - Segment		1,168,944	1,153,156
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income		115,909	104,435
Net intersegment interest income (expense)		(22,622)	(8,477)
Segment net interest income		93,287	95,958
Noninterest income		11,445	12,683
Total revenue		104,733	108,641
Credit provision		13,485	10,598
Noninterest Expense		38,788	39,250
Income (loss) before income taxes		52,460	58,793
Income tax expense (benefit)		10,003	11,426
Net income		42,457	47,367
Segment Balance Sheet Data
Allocated Goodwill - Segment		524,525	519,779
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income		88,072	86,395
Net intersegment interest income (expense)		23,442	17,148
Segment net interest income		111,514	103,543
Noninterest income		74,223	74,036
Total revenue		185,737	177,579
Credit provision		5,033	4,966
Noninterest Expense		130,863	127,144
Income (loss) before income taxes		49,841	45,469
Income tax expense (benefit)		10,443	9,549
Net income		39,398	35,920
Segment Balance Sheet Data
Allocated Goodwill - Segment		644,419	633,377
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income		11,567	19,041
Net intersegment interest income (expense)		(821)	(8,671)
Segment net interest income		10,746	10,370
Noninterest income		5,533	3,661
Total revenue		16,280	14,031
Credit provision		(12,518)	(15,563)
Noninterest Expense		21,893	46,571
Income (loss) before income taxes		6,905	(16,977)
Income tax expense (benefit)		1,947	(3,146)
Net income		4,958	(13,831)
Segment Balance Sheet Data
Allocated Goodwill - Segment		0	0
Business Combination, Acquisition Related Costs	[1]	$ 632	$ 20,605
[1]	Includes Huntington branch and Bank Mutual acquisition related costs only.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (124,972)
Debt Securities, Available-for-sale, Realized Loss	0	$ 0
Personnel expense	120,050	117,685
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)	(69)	297
Total other comprehensive income (loss)	21,597	(44,915)
Ending Balance	(103,375)
Investment Securities Available For Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(75,643)	(38,453)
Other comprehensive income (loss) before reclassifications	30,490	(41,834)
Debt Securities, Available-for-sale, Realized Loss	(1,680)
Personnel expense	0	0
Other Expenses	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)	69	(297)
Income tax (expense) benefit	(7,301)	10,635
Total other comprehensive income (loss)	21,578	(40,000)
Ending Balance	(54,065)	(78,453)
Defined Benefit Pension and Post Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(49,330)	(24,305)
Other comprehensive income (loss) before reclassifications	0	0
Debt Securities, Available-for-sale, Realized Loss	0
Personnel expense	(38)	(38)
Other Expenses	64	465
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
Income tax (expense) benefit	(7)	(107)
Total other comprehensive income (loss)	20	(4,915)
Ending Balance	(49,310)	(29,220)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(124,972)	(62,758)
Other comprehensive income (loss) before reclassifications	30,490	(41,834)
Debt Securities, Available-for-sale, Realized Loss	(1,680)
Personnel expense	(38)	(38)
Other Expenses	64	465
Change in Equity Securities(2016-01)		(84)
Reporting Comprehensive Income(2018-02)		(13,654)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)	69	(297)
Income tax (expense) benefit	(7,308)	10,528
Total other comprehensive income (loss)	21,597	(44,915)
Ending Balance	$ (103,375)	$ (107,673)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		$ 72,538	$ 72,725
Other revenue		18,665	17,655
Total noninterest income		91,202	90,380
Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		25,464	22,648
Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	[1]	20,180	20,642
Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		15,115	16,420
Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		9,295	9,472
Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		2,484	3,544
Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		3,448	5,195
Other revenue		7,998	7,488
Corporate and Commercial Specialty | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		0	0
Corporate and Commercial Specialty | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		0	0
Corporate and Commercial Specialty | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		3,388	4,225
Corporate and Commercial Specialty | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		328	315
Corporate and Commercial Specialty | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		(268)	655
Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		68,899	67,198
Other revenue		5,325	6,838
Community, Consumer, and Business | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		25,461	22,624
Community, Consumer, and Business | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		20,180	20,401
Community, Consumer, and Business | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		11,708	12,183
Community, Consumer, and Business | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		8,919	9,154
Community, Consumer, and Business | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		2,632	2,837
Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		191	332
Other revenue		5,342	3,329
Risk Management and Shared Services | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		3	24
Risk Management and Shared Services | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		0	241
Risk Management and Shared Services | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		19	12
Risk Management and Shared Services | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		49	3
Risk Management and Shared Services | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606		120	52
Operating Segments [Member] | Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Total noninterest income		11,445	12,683
Operating Segments [Member] | Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Total noninterest income		74,223	74,036
Operating Segments [Member] | Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Total noninterest income		$ 5,533	$ 3,661
[1]	Includes trust, asset management, brokerage, and annuity fees.

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use asset	$ 49,372	$ 52,000
Finance lease right-of-use asset	0
Operating lease liability	53,516	$ 56,000
Finance lease liability	$ 0

Leases Operating Lease Informat

Leases Operating Lease Information (Details)	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	7 years 3 months 10 days
Weighted-average discount rate	3.42%
Equipment
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	1 year 4 months 9 days
Weighted-average discount rate	2.73%
Retail and corporate offices
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	6 years 5 months 15 days
Weighted-average discount rate	3.43%
Land
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	12 years 2 months 8 days
Weighted-average discount rate	3.39%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Nine Months Ending December 31, 2019	$ 8,330
2020	10,583
2021	9,884
2022	7,440
2023	5,297
Beyond 2023	20,110
Total lease payments	61,644
Less: interest	8,129
Present value of lease payments	$ 53,516	$ 56,000

Leases (Details Textuals)

Leases (Details Textuals) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 2.9
Operating Lease, Payments	2.8
Additional operating leases	$ 19.3
Minimum
Lessee, Lease, Description [Line Items]
Operating lease terms	1 year
Additional operating lease terms	3 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease terms	44 years
Additional operating lease terms	10 years