Associated Banc-Corp (ASB) 10-Q 31 Oct 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 25, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-31343
Entity Registrant Name	Associated Banc-Corp
Entity Incorporation, State or Country Code	WI
Entity Address, Address Line One	433 Main Street
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Tax Identification Number	39-1098068
Entity Address, Postal Zip Code	54301
City Area Code	920
Local Phone Number	491-7500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		159,341,912
Entity Central Index Key	0000007789
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	ASB
Security Exchange Name	NYSE
Series C Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 6.125% Non-Cum. Perp Pref Stock, Srs C
Trading Symbol	ASB PrC
Security Exchange Name	NYSE
Series D Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.375% Non-Cum. Perp Pref Stock, Srs D
Trading Symbol	ASB PrD
Security Exchange Name	NYSE
Series E Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.875% Non-Cum. Perp Pref Stock, Srs E
Trading Symbol	ASB PrE
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		3 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and due from banks		$ 523,435	$ 507,187
Interest-bearing deposits in other financial institutions		236,010	221,226
Federal funds sold and securities purchased under agreements to resell		100	148,285
Investment securities held to maturity, at amortized cost(a)	[1]	2,200,419	2,740,511
Investment securities available for sale, at fair value(a)	[1]	3,436,289	3,946,941
Equity securities		15,096	1,568
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		207,443	250,534
Loans		22,754,710	22,940,429
Allowance for loan losses		(214,425)	(238,023)
Loans, net		22,540,285	22,702,406
Bank and corporate owned life insurance		670,739	663,203
Investment in unconsolidated subsidiaries		256,220	161,181
Premises and equipment, net		436,268	363,225
Goodwill		1,176,230	1,169,023
Mortgage servicing rights, net		68,168	68,193
Other intangible assets, net		91,089	75,836
Other assets(b)		589,420	516,538
Total assets		32,596,460	33,615,122
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits		5,503,223	5,698,530
Interest-bearing deposits		18,919,339	19,198,863
Total deposits		24,422,562	24,897,393
Federal funds purchased and securities sold under agreements to repurchase		78,028	111,651
Commercial paper		30,416	45,423
FHLB advances		2,877,727	3,574,371
Other long-term funding		796,799	795,611
Accrued expenses and other liabilities(b)	[2]	470,073	409,787
Total liabilities		28,675,605	29,834,235
Stockholders’ Equity
Preferred equity		256,716	256,716
Common stock		1,752	1,752
Surplus		1,713,971	1,712,615
Retained earnings		2,341,158	2,181,414
Accumulated other comprehensive income (loss)		(36,953)	(124,972)
Treasury stock, at cost		(355,791)	(246,638)
Total common equity		3,664,139	3,524,171
Total stockholders’ equity		3,920,855	3,780,888
Total liabilities and stockholders’ equity		$ 32,596,460	$ 33,615,122
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		15,925,525	10,775,938
Transfer of securities from held to maturity to available for sale		$ 692,000
Residential loans held for sale
Assets
Loans Receivable Held-for-sale, Amount		137,655	$ 64,321
Loans		7,954,801	8,277,712
Commercial loans held for sale
Assets
Loans Receivable Held-for-sale, Amount		11,597	14,943
Loans		13,570,932	13,405,072
Total consumer
Assets
Loans		$ 9,183,778	$ 9,535,357
[1]	(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.
[2]	(b) During the third quarter of 2019, the Corporation made a change in accounting policy to offset derivative assets and liabilities and cash collateral with the same counterparty where it has a legally enforceable master netting agreement in place. The change had no impact on either earnings or equity. The Corporation believes that this change is a preferable method of accounting as it provides a better reflection of the assets and liabilities on the face of the consolidated balance sheets. Adoption of this change was voluntary and has been adopted retrospectively with all prior periods presented herein revised.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 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		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans		$ 248,579	$ 249,649	$ 768,216	$ 716,329
Interest and dividends on investment securities
Taxable		23,485	29,895	79,248	90,622
Tax-exempt		14,491	11,883	42,950	31,883
Other interest		4,865	4,036	13,086	9,366
Total interest income		291,420	295,464	903,500	848,201
Interest expense
Interest on deposits		61,585	50,116	191,408	121,959
Interest on federal funds purchased and securities sold under agreements to repurchase		145	504	1,058	1,564
Interest on other short-term funding		33	38	121	150
Interest on FHLB advances		15,896	19,318	53,194	53,720
Interest on long-term funding		7,396	6,095	22,188	15,183
Total interest expense		85,054	76,072	267,969	192,576
Net interest income		206,365	219,392	635,532	655,625
Provision for credit losses		2,000	(5,000)	16,000	(1,000)
Net interest income after provision for credit losses		204,365	224,392	619,532	656,625
Noninterest income
Noninterest Income In Scope of Topic 606		72,713	72,718	216,373	218,270
Capital markets, net		4,300	5,099	12,215	15,189
Mortgage banking, net		10,940	4,012	25,118	16,640
Bank and corporate owned life insurance		4,337	3,540	11,482	10,705
Asset gains (losses), net(b)	[1]	877	(1,037)	2,316	1,353
Investment securities gains (losses), net		3,788	30	5,931	(1,985)
Other		2,537	2,802	8,344	7,529
Total noninterest income		100,850	88,300	287,890	271,522
Noninterest expense
Personnel		123,170	124,476	366,449	366,141
Technology		20,572	17,563	59,698	54,730
Occupancy		15,164	14,519	45,466	44,947
Business development and advertising		7,991	8,213	21,284	21,973
Equipment		6,335	5,838	17,580	17,347
Legal and professional		5,724	5,476	14,342	17,173
Loan and foreclosure costs		1,638	2,439	5,599	5,844
FDIC assessment		4,000	7,750	12,250	24,250
Other intangible amortization		2,686	2,233	7,237	5,926
Other		12,021	13,634	34,479	40,323
Total noninterest expense		200,930	204,413	590,380	628,636
Income (loss) before income taxes		104,286	108,279	317,042	299,510
Income tax expense		20,947	22,349	62,356	54,932
Net income		83,339	85,929	254,686	244,578
Preferred stock dividends		3,801	2,409	11,402	7,077
Net income available to common equity		$ 79,539	$ 83,521	$ 243,285	$ 237,501
Earnings per common share
Basic		$ 0.50	$ 0.49	$ 1.49	$ 1.40
Diluted		$ 0.49	$ 0.48	$ 1.48	$ 1.38
Average common shares outstanding
Basic		159,126	170,516	161,727	168,249
Diluted		160,382	172,802	163,061	170,876
Insurance commissions and fees
Noninterest income
Noninterest Income In Scope of Topic 606		$ 20,954	$ 21,636	$ 69,403	$ 68,279
Wealth management fees(a)
Noninterest income
Noninterest Income In Scope of Topic 606		21,015	21,224	61,885	62,198
Service charges on deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606		16,561	16,904	47,102	49,714
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606		10,501	9,826	29,973	29,454
Service charges and account fees		10,456	9,783	29,848	29,341
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606		3,683	3,128	8,010	8,624
Service charges and account fees		5,085	4,307	14,246	12,559
Operating Segments | Risk Management and Shared Services
Interest expense
Net interest income		13,919	14,770	38,583	47,770
Provision for credit losses		(15,919)	(21,512)	(38,721)	(49,081)
Noninterest income
Total noninterest income		6,265	2,183	14,983	8,242
Noninterest expense
Acquisition related costs(c)	[2]	1,629	2,271	5,995	29,983
Total noninterest expense		23,981	22,959	65,399	100,654
Income (loss) before income taxes		1,790	6,572	10,209	(22,712)
Income tax expense		1,295	1,388	1,816	(10,460)
Net income		$ 495	$ 5,185	$ 8,393	(12,252)
Huntington National Bank
Related acquisition asset losses net of asset gains		less than $1 million		less than $1 million
Bank Mutual
Related acquisition asset losses net of asset gains			approximately $1 million
Noninterest income
Asset gains (losses), net(b)					$ 2,000
[1]	(b) The nine months ended September 30, 2019 include less than $1 million of Huntington related asset losses; the three months and nine months ended September 30, 2018 include approximately $1 million and $2 million of Bank Mutual acquisition related asset losses net of asset gains, respectively.
[2]	(c) Includes Bank Mutual, Huntington branch, and First Staunton acquisition related costs only.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 83,339	$ 85,929	$ 254,686	$ 244,578
Investment securities available for sale
Net unrealized gains (losses)	33,173	(21,345)	123,139	(82,099)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities	(8)	(52)	279	(684)
Reclassification adjustment for net losses (gains) realized in net income	(3,788)	(30)	(5,931)	1,985
Reclassification from OCI due to change in accounting principle	0	0	0	(84)
Reclassification of certain tax effects from OCI	0	0	0	(8,419)
Income tax (expense) benefit	(7,410)	5,456	(29,651)	20,796
Other comprehensive income (loss) on investment securities available for sale	21,967	(15,971)	87,836	(68,505)
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(36)	(37)	(111)	(112)
Amortization of actuarial loss (gain)	229	551	357	1,480
Reclassification of certain tax effects from OCI	0	0	0	(5,235)
Income tax (expense) benefit	(49)	(174)	(62)	(390)
Other comprehensive income (loss) on pension and postretirement obligations	144	340	184	(4,257)
Total other comprehensive income (loss)	22,111	(15,631)	88,020	(72,762)
Comprehensive income	$ 105,450	$ 70,298	$ 342,706	$ 171,816

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Preferred Equity	Common Stock	Surplus	Retained Earnings	Retained EarningsSeries C Preferred Stock	Retained EarningsSeries D Preferred Stock	Retained EarningsSeries E Preferred Stock	Accumulated Other Comprehensive Income (Loss)	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				69,456
Other comprehensive income (loss)		(31,177)								(31,177)
Adoption of new accounting standards		(13,738)								(13,738)
Comprehensive income		24,541
Common stock issued
Stock-based compensation plans, net		10,691			(7,665)	20,136					(1,780)
Acquisition of Bank Mutual		481,688		134	390,258						91,296
Purchase of common stock returned to authorized but unissued		(26,480)		(11)	(26,469)
Purchase of treasury stock		(5,240)									(5,240)
Cash dividends
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)		(25,710)				(25,710)
Preferred stock(a)	[1]	(2,339)				(2,339)
Purchase of preferred stock		(78)	(76)			(2)
Stock-based compensation expense, net		3,675			3,675
Tax Act reclassification		13,654				13,654
Change in accounting principle		84				84
Other		771				771
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, 2017		3,237,443	159,929	1,618	1,338,722	1,934,696				(62,758)	(134,764)
Comprehensive income
Net income		244,578
Other comprehensive income (loss)		(72,762)								(72,762)
Comprehensive income		171,816
Cash dividends
Proceeds from Issuance of Preferred Stock and Preference Stock		97,315
Change in accounting principle										(84)
Ending balance at Sep. 30, 2018		3,797,038	256,716	1,752	1,709,078	2,128,490				(135,520)	(163,478)
Cash dividends
Decrease Adjustment Options RSA and RSU					561
Increase Adjustment Options, RSA and RSU						272					289
Preferred Stock, Dividends, Per Share, Cash Paid							$ 0.3828125	$ 0.3359375
Beginning balance at Mar. 31, 2018		3,712,699	159,853	1,741	1,698,521	2,010,746				(107,673)	(50,488)
Comprehensive income
Net income		89,192				89,192
Other comprehensive income (loss)		(12,215)								(12,215)
Comprehensive income		76,977
Common stock issued
Stock-based compensation plans, net		5,456			1,455	(485)					4,486
Acquisition of Bank Mutual		6,720		3	6,717
Purchase of common stock returned to authorized but unissued		(6,595)		(3)	(6,592)
Purchase of treasury stock		(477)									(477)
Cash dividends
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)		(26,107)				(26,107)
Preferred stock(a)	[1]	(2,329)				(2,329)
Common stock warrants exercised		0		10	(10)
Purchase of preferred stock		(459)	(452)			(6)
Stock-based compensation expense, net		4,497			4,497
Other		(139)				(139)
Ending balance at Jun. 30, 2018		3,770,244	159,401	1,751	1,704,587	2,070,872				(119,888)	(46,479)
Comprehensive income
Net income		85,929				85,929
Other comprehensive income (loss)		(15,631)								(15,631)
Comprehensive income		70,298
Common stock issued
Stock-based compensation plans, net	[2]	1,246			(129)	(289)					1,664
Purchase of treasury stock		(118,663)									(118,663)
Cash dividends
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)		(25,614)				(25,614)
Preferred stock(a)	[1],[3]	(2,409)				(2,409)
Proceeds from Issuance of Preferred Stock and Preference Stock		97,315	97,315
Common stock warrants exercised		0		1	(1)
Stock-based compensation expense, net		4,620			4,620
Ending balance at Sep. 30, 2018		3,797,038	256,716	1,752	1,709,078	2,128,490				(135,520)	(163,478)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid									$ 0.3671875
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				86,686
Other comprehensive income (loss)		21,597								21,597
Comprehensive income		108,283
Common stock issued
Stock-based compensation plans, net		7,045			(32,220)						39,265
Purchase of treasury stock		(37,467)									(37,467)
Cash dividends
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)		(28,183)				(28,183)
Preferred stock(a)	[4]	(3,801)				(3,801)
Stock-based compensation expense, net		9,397			9,397
Other		(293)				(293)
Ending balance at Mar. 31, 2019		3,835,870	256,716	1,752	1,689,792	2,235,824				(103,375)	(244,840)
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		254,686
Other comprehensive income (loss)		88,020								88,020
Comprehensive income		342,706
Cash dividends
Proceeds from Issuance of Preferred Stock and Preference Stock		0
Ending balance at Sep. 30, 2019		3,920,855	256,716	1,752	1,713,971	2,341,158				(36,953)	(355,791)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid									$ 0.3671875
Beginning balance at Mar. 31, 2019		3,835,870	256,716	1,752	1,689,792	2,235,824				(103,375)	(244,840)
Comprehensive income
Net income		84,661				84,661
Other comprehensive income (loss)		44,311								44,311
Comprehensive income		128,972
Common stock issued
Stock-based compensation plans, net		827			(211)						1,038
Purchase of treasury stock		(40,433)									(40,433)
Cash dividends
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)		(27,776)				(27,776)
Preferred stock(a)	[4]	(3,801)				(3,801)
Stock-based compensation expense, net		6,134			6,134
Ending balance at Jun. 30, 2019		3,899,794	256,716	1,752	1,695,715	2,288,909				(59,063)	(284,235)
Comprehensive income
Net income		83,339				83,339
Other comprehensive income (loss)		22,111								22,111
Comprehensive income		105,450
Common stock issued
Stock-based compensation plans, net		1,198			12,561						(11,363)
Purchase of treasury stock		(60,193)									(60,193)
Cash dividends
Common stock ($0.15 per share in 2018 and $0.17 per share in 2019)		(27,289)				(27,289)
Preferred stock(a)	[4]	(3,801)				(3,801)
Stock-based compensation expense, net		5,696			5,696
Ending balance at Sep. 30, 2019		$ 3,920,855	$ 256,716	$ 1,752	$ 1,713,971	$ 2,341,158				$ (36,953)	$ (355,791)
[1]	(b) Series C, $0.3828125 per share and Series D, $0.3359375 per share.
[2]	(a) As previously disclosed in the Corporation's 2018 Annual Report on Form 10-K, an adjustment was made to the September 30, 2018 stockholders' equity balances related to the grant and vesting of options, restricted stock awards, and restricted stock units awarded. This adjustment decreased Surplus approximately $561,000 , increased Retained Earnings approximately $272,000 , and increased Treasury Stock approximately $289,000 . The reclassification had no impact on earnings, expenses, or total stockholders' equity.
[3]	(c) Series E, $0.3671875 per share.
[4]	(a) Series C, $0.3828125 per share; Series D, $0.3359375 per share; and Series E, $0.3671875 per share.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Common Stock, Dividends, Per Share, Cash Paid	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.15

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended				9 Months Ended		12 Months Ended
		Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash Flow From Operating Activities
Net income		$ 83,339	$ 86,686	$ 85,929	$ 69,456	$ 254,686	$ 244,578
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses		2,000		(5,000)		16,000	(1,000)
Depreciation and amortization						43,704	36,273
Addition to (recovery of) valuation allowance on mortgage servicing rights, net						177	(669)
Amortization of mortgage servicing rights						8,749	7,143
Amortization of other intangible assets		2,686		2,233		7,237	5,926
Amortization and accretion on earning assets, funding, and other, net						17,607	(425)
Net amortization of tax credit investments						15,512	14,388
Losses (gains) on sales of investment securities, net						(5,931)	1,985
Asset (gains) losses, net	[1]	(877)		1,037		(2,316)	(1,353)
(Gain) loss on mortgage banking activities, net						(15,966)	(4,519)
Mortgage loans originated and acquired for sale						(824,289)	(847,619)
Proceeds from sales of mortgage loans held for sale						1,048,729	826,929
Pension Contribution						0	(41,877)
Changes in certain assets and liabilities
(Increase) decrease in interest receivable						2,476	(14,791)
Increase (decrease) in interest payable						589	4,671
Increase (decrease) in expense payable						(15,932)	41,938
Increase (decrease) in cash collateral						(8,237)	37,272
Increase (decrease) in net derivative position						(109,948)	(21,428)
Net change in other assets and other liabilities						37,138	15,321
Net cash provided by (used in) operating activities						469,986	302,743
Cash Flow From Investing Activities
Net increase in loans						(72,644)	(322,589)
Purchases of
Available for sale securities						(460,124)	(737,580)
Held to maturity securities						(322,590)	(553,258)
Federal Home Loan Bank and Federal Reserve Bank stocks						(214,554)	(267,432)
Premises, equipment, and software, net of disposals						(50,385)	(42,941)
Proceeds from
Sales of available for sale securities						1,367,450	601,130
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks						257,646	231,964
Prepayments, calls, and maturities of available for sale investment securities						400,648	487,858
Prepayments, calls, and maturities of held to maturity investment securities						168,378	168,125
Sales, prepayments, calls, and maturities of other assets						6,674	22,132
Net change in tax credit and alternative investments						(50,117)	(30,579)
Cash Acquired from Acquisition						551,250	59,472
Net cash provided by (used in) investing activities						1,581,631	(383,698)
Cash Flow From Financing Activities
Net increase (decrease) in deposits						(1,200,004)	204,700
Net increase (decrease) in short-term funding						(48,630)	(528,285)
Net increase (decrease) in short-term FHLB advances						(685,000)	121,000
Repayment of long-term FHLB advances						(763,036)	(1,900,012)
Proceeds from long-term FHLB advances						751,573	1,841,776
Proceeds from issuance of long-term funding						0	300,000
Proceeds from issuance of preferred shares				97,315		0	97,315
Proceeds from issuance of common stock for stock-based compensation plans						9,070	17,393
Purchase of preferred shares						0	(646)
Purchase of common stock returned to authorized but unissued						0	(33,075)
Purchase of treasury stock						(138,093)	(124,380)
Cash dividends on common stock						(83,248)	(77,431)
Cash dividends on preferred stock						(11,402)	(7,077)
Net cash provided by (used in) financing activities						(2,168,770)	(88,722)
Net increase (decrease) in cash, cash equivalents, and restricted cash						(117,154)	(169,677)
Cash, cash equivalents, and restricted cash at beginning of period			876,698		716,018	876,698	716,018	$ 716,018
Cash, cash equivalents, and restricted cash at end of period		759,545		546,341		759,545	546,341	876,698
Supplemental disclosures of cash flow information
Cash paid for interest						266,192	185,875
Cash paid for (received from) income and franchise taxes						38,979	17,335
Loans and bank premises transferred to OREO						7,734	20,781
Capitalized mortgage servicing rights						8,900	7,826
Loans transferred into held for sale from portfolio, net						326,476	56,550
Acquisition
Fair value of assets acquired, including cash and cash equivalents									$ 695,848	$ 2,567,560
Fair value ascribed to goodwill and intangible assets									29,837	261,142
Fair value of liabilities assumed									725,764	2,340,294
Equity issued in (adjustments related to) acquisition						(79)	488,408
Restricted Cash and Cash Equivalents
Cash and cash equivalents									562,798	457,728
Restricted cash									196,747	88,613
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows		$ 759,545	$ 876,698	$ 546,341	$ 716,018	$ 876,698	$ 716,018	$ 876,698	$ 759,545	$ 546,341
[1]	(b) The nine months ended September 30, 2019 include less than $1 million of Huntington related asset losses; the three months and nine months ended September 30, 2018 include approximately $1 million and $2 million of Bank Mutual acquisition related asset losses net of asset gains, respectively.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 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 the Corporation and Parent Company 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. Within the tables presented, certain columns and rows may not sum due to the use of rounded numbers for disclosure purposes.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions Huntington Wisconsin Branch Acquisition On February 15, 2019, the Corporation received regulatory approval for the acquisition of the Wisconsin branches of Huntington. This all cash transaction closed on June 14, 2019 . The conversion of the branches happened simultaneously with the close of the transaction and the acquisition expanded the Bank's presence into 13 new Wisconsin communities. As a result of the acquisition and other consolidations, a net of 14 branch locations were added. The Huntington branch acquisition constituted a business combination. The acquisition has been accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair value on the acquisition date. The determination of estimated fair values required management to make certain estimates that are subjective in nature and may require adjustments upon the availability of new information regarding facts and circumstances which existed at the date of acquisition (i.e., appraisals) for up to a year following the acquisition. The Corporation continues to review information relating to events or circumstances existing at the acquisition date. Management anticipates that this review could result in adjustments to the acquisition date valuation amounts presented herein but does not anticipate that these adjustments will be material. The Corporation recorded approximately $7 million in goodwill related to the Huntington branch acquisition during the second quarter of 2019 and approximately $210,000 during the third quarter of 2019. Upon review of information relating to events and circumstances existing at the acquisition date, and in accordance with applicable accounting guidance, the Corporation remeasured select previously reported fair value amounts. The adjustment to goodwill was driven by an update that decreased the fair value of furniture acquired. Goodwill created by the acquisition is tax deductible. See Note 8 for additional information on goodwill, as well as the carrying amount and amortization of core deposit intangible assets related to the Huntington branch acquisition. The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Huntington branch acquisition: ($ in Thousands) Purchase Accounting Adjustments June 14, 2019 Assets Cash and cash equivalents $ — $ 551,250 Loans (1,552 ) 116,346 Premises and equipment, net 4,800 22,430 Goodwill 7,286 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 22,630 22,630 OREO (included in other assets on the face of the consolidated balance sheets) (2,561 ) 5,263 Other assets — 559 Total assets $ 725,764 Liabilities Deposits $ 156 $ 725,173 Other liabilities 70 590 Total liabilities $ 725,764 The following is a description of the methods used to determine the fair value of significant assets and liabilities presented on the balance sheet above. Loans: Fair values for loans were based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan, amortization status and current discount rates. Loans were grouped together according to similar characteristics when applying various valuation techniques. Core deposit intangible: This intangible asset represents the value of the relationships with deposit customers. The fair value was estimated based on a discounted cash flow methodology that gave appropriate consideration to expected customer attrition rates, net maintenance cost of the deposit base, alternative cost of funds, and the interest costs associated with customer deposits. The CDI will be amortized on a straight-line basis over 10 years . Other Acquisitions On July 25, 2019 , the Corporation entered into an agreement to acquire Illinois-based First Staunton for cash consideration of approximately $76 million . Upon completion of the transaction, the Bank expects to acquire approximately $350 million in loans, approximately $440 million in deposits, and 9 branches. Regulatory approval for the transaction was received from the OCC on October 10, 2019. The transaction is subject to customary closing conditions, and is expected to close in first quarter of 2020.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 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. GAAP 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 have been two changes to the Corporation's significant accounting policies since December 31, 2018 , which are 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. Leases with original terms of less than 12 months are not capitalized. 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. Derivative and Hedging Activities Derivative instruments, including derivative instruments embedded in other contracts, are carried at fair value on the consolidated balance sheets with changes in the fair value recorded to earnings or accumulated other comprehensive income, as appropriate. On the date the derivative contract is entered into, the Corporation designates the derivative as a fair value hedge (i.e., a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e., a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a free-standing derivative instrument. For a derivative designated as a fair value hedge, the changes in the fair value of the derivative instrument and the changes in the fair value of the hedged asset or liability are recognized in current period earnings as an increase or decrease to the carrying value of the hedged item on the balance sheet and in the related income statement account. Amounts within accumulated other comprehensive income are reclassified into earnings in the period the hedged item affects earnings. For a derivative designated as a free-standing derivative instrument, changes in fair value are reported in current period earnings. The free-standing derivative instruments included: interest rate risk management, commodity hedging, and foreign currency exchange solutions. The Corporation is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet. The Corporation uses master netting arrangements to mitigate counterparty credit risk in derivative transactions. To the extent the derivatives are subject to master netting arrangements, the Corporation takes into account the impact of master netting arrangements that allow the Corporation to settle all derivative contracts executed with the same counterparty on a net basis, and to offset the net derivative position with the related cash collateral. In the third quarter of 2019, the Corporation elected to offset derivative transactions with the same counterparty on the consolidated balance sheets when a derivative transaction has a legally enforceable master netting arrangement and when it is eligible for netting. Derivative balances and related cash collateral are presented net on the consolidated balance sheets. Refer to Change in Accounting Policy section within this note for additional discussion. In addition, the Corporation is exposed to changes in the fair value of certain 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. See Note 10 for additional information on derivative and hedging activities. Change in Accounting Policy The Corporation enters into ISDA master netting agreements with a portion of the Corporation’s derivative counterparties. Where legally enforceable, these master netting agreements give the Corporation, in the event of default by the counterparty, the right to liquidate securities and offset cash with the same counterparty. Under ASC 815-10-45-5, payables and receivables in respect of cash collateral received from or paid to a given counterparty can be offset against derivative fair values under a master netting arrangement. GAAP does not permit similar offsetting for security collateral. Prior to the third quarter of 2019, the Corporation elected to account for all derivatives’ fair values and related cash collateral on a gross basis on its consolidated balance sheets. In the third quarter of 2019, the Corporation elected to offset derivative assets and liabilities and cash collateral with the same counterparty where it has a legally enforceable master netting agreement in place. The change had no impact on either earnings or equity. The Corporation believes that this change is a preferable method of accounting as it provides a better reflection of the assets and liabilities on the face of the consolidated balance sheets. Adoption of this change is voluntary and has been adopted retrospectively with all prior periods presented herein being revised for comparability and as required. A reduction of $33 million was reflected between other assets as well as accrued expenses and other liabilities as of December 31, 2018 on the consolidated balance sheets. Change in Accounting Estimate During the third quarter of 2019, the Corporation reassessed its estimate of the useful lives of certain fixed assets. The Corporation revised its original useful life estimate from 7 years to 12 years for furniture assets. This is considered a change in accounting estimate, per ASC 250-10, where adjustments should be made prospectively. The impact of this change in accounting estimate for third quarter of 2019 to net income in the consolidated statements of income and premises and equipment, net in the consolidated balance sheets was approximately $230,000 . New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2019-07 Codification Updates to SEC Sections-Amendments to SEC Paragraphs Pursuant to SEC Final Releases No. 33-10532, Disclosure Updates and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates The FASB issued this amendment to align the guidance in various SEC sections of the Codification with the requirements of certain SEC final rules. This amendment became effective upon issuance. 3rd Quarter 2019 No material impact on results of operations, financial position and liquidity. ASU 2019-04 Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments The FASB issued this amendment to clarify certain aspects of accounting for credit losses, hedging activities, and financial instruments. Within ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, the amendment allows an entity to designate partial-term fair value hedges of interest rate risk and measure the hedged item by using an assumed maturity, clarifies that an entity can start to amortize the hedged items basis adjustment in a fair value hedge, and it requires entities to disclose for fair value hedging relationships the carrying amounts of hedged assets and liabilities and the cumulative amount of fair value hedge basis adjustments. In addition, it permits a one-time election to reclassify securities that could be used in a hedge from held to maturity to available for sale without risk of tainting the remainder of the held to maturity portfolio. For entities that have adopted the amendments in Update 2017-12 as of the issuance date of this Update, the effective date is as of the beginning of the first annual period beginning after the issuance date of this Update. For those entities, early adoption was permitted, including adoption on any date on or after the issuance of this Update. 3rd Quarter 2019 During the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale. 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 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Entities were required to 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. Standard Description Date of adoption Effect on financial statements 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 ASU. 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 required 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 could 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. Future Accounting Pronouncements The expected impact of accounting pronouncements recently issued or proposed but not yet required to be adopted are displayed in the table below: Standard Description Date of anticipated adoption Effect on financial statements ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The FASB issued an amendment to replace the current incurred loss impairment methodology. Under the new guidance, entities will be required to measure expected credit losses by utilizing forward-looking information to assess an entity's allowance for credit losses. The guidance also requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. This amendment is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. ASU 2018-19 was issued to clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. ASU 2019-04 was issued and provides entities alternatives for measurement of accrued interest receivable, clarifies the steps entities should take when recording the transfer of loans or debt securities between measurement classifications or categories and clarifies that entities should include expected recoveries on financial assets. ASU 2019-05 was issued to provide entities that have certain instruments within the scope of Subtopic 320-20 with an option to irrevocably elect the fair value option in Subtopic 825-10. Early adoption is permitted. 1st Quarter 2020 The Corporation has developed a CECL allowance model which calculates reserves over the life of the loan and is largely driven by portfolio characteristics, risk-grading, economic outlook, and key methodology assumptions. Those assumptions are based upon the existing probability of default and loss given default framework and existing DFAST systems. The Corporation will utilize a single economic forecast over a 1-year reasonable and supportable forecast period with 1-year straight-line reversion to historical losses. The Corporation's cross functional team is currently performing parallel testing and sensitivity analysis and will refine the model as needed. The Corporation anticipates a 30-40% increase in the allowance for credit losses from projected year-end 2019 levels. A majority of the increase is the result of economic uncertainty. The total estimated impact equates to an approximately 25 bp net, after tax, reduction in expected tangible common equity. The Corporation anticipates increases in the longer dated portfolios and decreases in the shorter dated portfolios. The Corporation is in the process of finalizing model validations and approval of all models and assumptions through the steering committee which may have an impact on the estimate provided. The overall estimate for CECL is largely dependent on the composition of the portfolio, credit quality and economic conditions and forecasts at the time of adoption. Standard Description Date of anticipated adoption Effect on financial statements ASU 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement The FASB issued an amendment to add, modify, and remove disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the FASB Concepts Statement "Conceptual Framework for Financial Reporting", including the consideration of costs and benefits. The amendment is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. 1st Quarter 2020 The Corporation is currently evaluating the impact on its results of operations, financial position and liquidity. ASU 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The FASB issued an amendment to simplify the subsequent quantitative measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Entities should apply the amendment prospectively. Early adoption is permitted, including in an interim period, for impairment tests performed after January 1, 2017. 2nd Quarter 2020, consistent with the Corporation's annual impairment test in May of each year. The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity. The Corporation has not had to perform a step one quantitative analysis since 2012, which concluded no impairment was necessary. ASU 2018-14 The FASB issued an amendment to modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments also added requirements to disclose the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The amendment also clarifies the disclosure requirements in paragraph 715-20-50-3, which states that certain information for defined benefit pension plans should be disclosed. The amendments in this Update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The amendment is effective for fiscal years ending after December 15, 2020. Entities should apply the amendments in this Update on a retrospective basis to all periods presented. Early adoption is permitted. 1st Quarter 2021 The Corporation is currently evaluating the impact on its results of operations, financial position and liquidity.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 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 September 30, For the Nine Months Ended September 30, (In Thousands, except per share data) 2019 2018 2019 2018 Net income $ 83,339 $ 85,929 $ 254,686 $ 244,578 Preferred stock dividends (3,801 ) (2,409 ) (11,402 ) (7,077 ) Net income available to common equity $ 79,539 $ 83,521 $ 243,285 $ 237,501 Common shareholder dividends (27,091 ) (25,486 ) (82,741 ) (77,035 ) Unvested share-based payment awards (198 ) (128 ) (506 ) (396 ) Undistributed earnings $ 52,250 $ 57,907 $ 160,037 $ 160,070 Undistributed earnings allocated to common shareholders 51,870 57,620 158,970 159,297 Undistributed earnings allocated to unvested share-based payment awards 380 288 1,067 772 Undistributed earnings $ 52,250 $ 57,907 $ 160,037 $ 160,070 Basic Distributed earnings to common shareholders $ 27,091 $ 25,486 $ 82,741 $ 77,035 Undistributed earnings allocated to common shareholders 51,870 57,620 158,970 159,297 Total common shareholders earnings, basic $ 78,961 $ 83,106 $ 241,711 $ 236,332 Diluted Distributed earnings to common shareholders $ 27,091 $ 25,486 $ 82,741 $ 77,035 Undistributed earnings allocated to common shareholders 51,870 57,620 158,970 159,297 Total common shareholders earnings, diluted $ 78,961 $ 83,106 $ 241,711 $ 236,332 Weighted average common shares outstanding 159,126 170,516 161,727 168,249 Effect of dilutive common stock awards 1,256 2,188 1,334 2,101 Effect of dilutive common stock warrants — 98 — 526 Diluted weighted average common shares outstanding 160,382 172,802 163,061 170,876 Basic earnings per common share $ 0.50 $ 0.49 $ 1.49 $ 1.40 Diluted earnings per common share $ 0.49 $ 0.48 $ 1.48 $ 1.38 Non-dilutive common stock options of approximately 3 million and 1 million for the three months ended September 30, 2019 and 2018 , respectively, and 3 million and 1 million for the nine months ended September 30, 2019 and 2018 , respectively, were excluded from the earnings per common share calculation.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 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 nine 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 nine months ended September 30, 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 (498 ) 15.57 Forfeited or expired (114 ) 22.42 Outstanding at September 30, 2019 5,718 $ 20.01 6.43 $ 11,541 Options Exercisable at September 30, 2019 3,535 $ 18.12 5.14 $ 10,901 (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 nine months ended September 30, 2019 , the intrinsic value of stock options exercised was approximately $3 million , compared to $10 million for the nine months ended September 30, 2018 . The total fair value of stock options vested was $4 million for the nine months ended September 30, 2019 and 2018 . The Corporation recognized compensation expense for the vesting of stock options of $4 million for the nine months ended September 30, 2019 and $3 million for the nine months ended September 30, 2018 . Included in compensation expense for 2019 was $1 million of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At September 30, 2019 , the Corporation had approximately $5 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 stock awards under the 2017 Incentive Compensation Plan. The following table summarizes information about the Corporation’s restricted stock awards activity for the nine months ended September 30, 2019 : Restricted Stock Awards Shares (a) Weighted Average Grant Date Fair Value Outstanding at December 31, 2018 1,993 $ 21.92 Granted 1,172 22.20 Vested (693 ) 20.56 Forfeited (67 ) 23.85 Outstanding at September 30, 2019 2,405 $ 22.39 (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 $18 million was recorded for the nine months ended September 30, 2019 and $10 million was recorded for the nine months ended September 30, 2018 . Included in compensation expense for the first nine months of 2019 was approximately $3 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $23 million of unrecognized compensation costs related to restricted stock awards at September 30, 2019 that are expected to be recognized over the remaining requisite service periods that extend through first quarter 2023 . The Corporation has the ability to issue shares from treasury or new shares upon the exercise of stock options or the granting of restricted stock awards. The Board of Directors has authorized management to repurchase shares of the Corporation’s common stock in the market, to be made available for issuance in connection with the Corporation’s employee incentive plans and for other corporate purposes. The repurchase of shares will be based on market and investment opportunities, capital levels, growth prospects, and regulatory constraints. Such repurchases may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs, or similar facilities.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 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 amortized cost and fair values of securities available for sale and held to maturity at September 30, 2019 were as follows: ($ in Thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) (a) $ 535,977 $ 17,441 $ — $ 553,418 Residential mortgage-related securities FNMA / FHLMC 141,678 1,657 (326 ) 143,009 GNMA 1,075,922 5,983 (1,322 ) 1,080,584 Private-label 749 9 — 758 Commercial mortgage-related securities FNMA / FHLMC 19,996 1,795 — 21,791 GNMA 1,363,848 10,095 (9,996 ) 1,363,948 FFELP asset backed securities 272,871 40 (3,123 ) 269,789 Other debt securities 3,000 — (7 ) 2,993 Total investment securities available for sale $ 3,414,042 $ 37,021 $ (14,774 ) $ 3,436,289 Investment securities held to maturity U. S. Treasury securities $ 999 $ 21 $ — $ 1,019 Obligations of state and political subdivisions (municipal securities) (a) 1,346,234 73,235 (733 ) 1,418,736 Residential mortgage-related securities FNMA / FHLMC 86,140 1,467 (17 ) 87,590 GNMA 295,370 4,832 (94 ) 300,108 GNMA commercial mortgage-related securities 471,675 7,115 (4,959 ) 473,832 Total investment securities held to maturity $ 2,200,419 $ 86,669 $ (5,803 ) $ 2,281,285 (a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale. The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2018 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value 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 September 30, 2019 are shown below: Available for Sale Held to Maturity ($ in Thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 3,045 $ 3,049 $ 29,063 $ 29,208 Due after one year through five years 24,894 25,227 91,045 92,075 Due after five years through ten years 295,533 304,383 128,365 132,716 Due after ten years 215,505 223,752 1,098,760 1,165,757 Total debt securities 538,977 556,411 1,347,233 1,419,755 Residential mortgage-related securities FNMA / FHLMC 141,678 143,009 86,140 87,590 GNMA 1,075,922 1,080,584 295,370 300,108 Private-label 749 758 — — Commercial mortgage-related securities FNMA / FHLMC 19,996 21,791 — — GNMA 1,363,848 1,363,948 471,675 473,832 FFELP asset backed securities 272,871 269,789 — — Total investment securities $ 3,414,042 $ 3,436,289 $ 2,200,419 $ 2,281,285 Ratio of fair value to amortized cost 100.7 % 103.7 % Investment securities gains (losses), net includes proceeds from the sale of investment securities as well as any applicable write-ups or write-downs of investment securities. The proceeds from the sale and write-up of investment securities for the nine months ended September 30, 2019 and 2018 are shown below: Nine Months Ended September 30, ($ in Thousands) 2019 2018 Gross gains on available for sale securities $ 6,347 $ 1,954 Gross gains on held to maturity securities — — Total gains 6,347 1,954 Gross (losses) on available for sale securities (13,861 ) (3,938 ) Gross (losses) on held to maturity securities — — Total (losses) (13,861 ) (3,938 ) Write-up of equity securities without readily determinable fair values 13,444 — Investment securities gains (losses), net $ 5,931 $ (1,985 ) Proceeds from sales of investment securities $ 1,367,450 $ 601,130 During the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale, as permitted by the adoption of ASU 2019-04 during the quarter. The Corporation sold shorter duration, lower yielding municipal securities that were included in the transfer for proceeds of $157 million at a gain of $3 million , with the proceeds being reinvested into longer duration, higher yielding held to maturity municipal securities. Additionally, during the first nine months of 2019, the Corporation sold $1.2 billion of taxable, floating rate ABS and shorter duration MBS, CMBS, and CMO Agency securities, with the proceeds utilized to pay down borrowings and to reinvest into higher yielding Agency related mortgage securities with slightly longer durations, repositioning the portfolio for a declining rate environment. The Corporation also donated 42,039 shares of Visa Class B restricted shares to the Corporation's Charitable Remainder Trust during the second quarter of 2019, and the subsequent sale of those shares by the Trust resulted in an observable market price. As a result, the Corporation wrote up its remaining 77,000 Visa Class B restricted shares to fair value. Based on the existing transfer restriction and the uncertainty of covered litigation, the shares were previously carried at a zero cost basis. During 2018, the Corporation executed a strategy to improve the yield on securities and increase interest income during the current and future calendar years. During the third quarter of 2018, the Corporation sold mortgage-related securities totaling approximately $108 million at a slight gain with all the proceeds reinvested into higher-yielding securities. The taxable equivalent yield of the securities sold was 3.08% while the reinvestment was at 3.51% . During the first six months of 2018, the Corporation also sold $40 million of lower yielding GNMA commercial mortgage-related securities. In addition, 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. That strategy was completed during August 2018. Investment securities with a carrying value of approximately $3.0 billion at both September 30, 2019 and December 31, 2018 were required to be pledged to secure certain deposits or for other purposes as required or permitted by law. The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2019 : Less than 12 months 12 months or more Total ($ in Thousands) Number of Securities Unrealized (Losses) Fair Value Number of Securities Unrealized (Losses) Fair Value Unrealized (Losses) Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) 1 $ — $ 348 — $ — $ — $ — $ 348 Residential mortgage-related securities FNMA / FHLMC 6 (38 ) 21,554 10 (289 ) 65,798 (326 ) 87,352 GNMA 4 (440 ) 67,563 3 (881 ) 86,930 (1,322 ) 154,493 GNMA commercial mortgage-related securities 15 (420 ) 179,281 44 (9,576 ) 653,148 (9,996 ) 832,429 FFELP asset backed securities 18 (2,853 ) 241,852 2 (270 ) 13,213 (3,123 ) 255,065 Other debt securities 3 (7 ) 2,993 — — — (7 ) 2,993 Total 47 $ (3,758 ) $ 513,592 59 $ (11,016 ) $ 819,089 $ (14,774 ) $ 1,332,681 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 25 $ (705 ) $ 34,087 10 $ (28 ) $ 3,846 $ (733 ) $ 37,934 Residential mortgage-related securities FNMA / FHLMC 3 (8 ) 3,674 1 (9 ) 840 (17 ) 4,514 GNMA 1 (25 ) 6,490 8 (69 ) 6,938 (94 ) 13,429 GNMA commercial mortgage-related securities 2 (56 ) 29,467 21 (4,903 ) 390,602 (4,959 ) 420,069 Total 31 $ (794 ) $ 73,718 40 $ (5,009 ) $ 402,227 $ (5,803 ) $ 475,945 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 ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair 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 September 30, 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 September 30, 2019 for mortgage-related securities have declined due to the decrease in overall interest rates. The U.S. Treasury 3 year and 5 year rates decreased by 90 bp and 96 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. FHLB and Federal Reserve Bank stocks: The Corporation is required to maintain Federal Reserve Bank 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 September 30, 2019 and December 31, 2018 , the Corporation had FHLB stock of $129 million and $173 million , respectively. The Corporation had Federal Reserve Bank stock of $78 million at September 30, 2019 and $77 million at December 31, 2018 . Equity Securities Equity securities with readily determinable fair values: The Corporation's portfolio of equity securities with readily determinable fair values is primarily comprised of CRA Qualified Investment mutual funds. At both September 30, 2019 and December 31, 2018 , the Corporation had equity securities with readily determinable fair values of $2 million . Equity securities without readily determinable fair values: The Corporation's portfolio of equity securities without readily determinable fair values consists of Visa Class B restricted shares that the Corporation received in 2008 as part of Visa's initial public offering. During the second quarter of 2019, the Corporation donated 42,039 shares of Visa Class B restricted shares to the Corporation's Charitable Remainder Trust, and the subsequent sale of those shares by the Trust resulted in an observable market price. As a result, the Corporation wrote up their remaining 77,000 Visa Class B restricted shares to fair value. Based on the existing transfer restriction and the uncertainty of the covered litigation, the Visa Class B restricted shares were previously carried at a zero cost basis. Thus, the Corporation had equity securities without readily determinable fair values of $13 million at September 30, 2019 and $0 at December 31, 2018

Loans

Loans	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Loans	Loans The period end loan composition was as follows: ($ in Thousands) September 30, 2019 December 31, 2018 Commercial and industrial $ 7,495,623 $ 7,398,044 Commercial real estate — owner occupied 915,524 920,443 Commercial and business lending 8,411,147 8,318,487 Commercial real estate — investor 3,803,277 3,751,554 Real estate construction 1,356,508 1,335,031 Commercial real estate lending 5,159,784 5,086,585 Total commercial 13,570,932 13,405,072 Residential mortgage 7,954,801 8,277,712 Home equity 879,642 894,473 Other consumer 349,335 363,171 Total consumer 9,183,778 9,535,357 Total loans (a)(b) $ 22,754,710 $ 22,940,429 (a) During the third quarter of 2019, the Corporation sold approximately $240 million of portfolio mortgages as well as $33 million of nonaccrual and performing restructured loans. (b) Includes $2 million and $5 million of purchased credit-impaired loans at September 30, 2019 and December 31, 2018 , respectively. The following table presents commercial and consumer loans by credit quality indicator at September 30, 2019 : ($ in Thousands) Pass Special Mention Potential Problem Nonaccrual Total Commercial and industrial $ 7,293,226 $ 86,434 $ 59,427 $ 56,536 $ 7,495,623 Commercial real estate - owner occupied 866,287 26,546 22,624 68 915,524 Commercial and business lending 8,159,513 112,980 82,051 56,604 8,411,147 Commercial real estate - investor 3,634,780 114,343 49,353 4,800 3,803,277 Real estate construction 1,332,930 22,492 544 542 1,356,508 Commercial real estate lending 4,967,710 136,835 49,897 5,342 5,159,784 Total commercial 13,127,223 249,815 131,948 61,946 13,570,932 Residential mortgage 7,896,073 430 1,242 57,056 7,954,801 Home equity 868,854 961 — 9,828 879,642 Other consumer 348,498 728 — 109 349,335 Total consumer 9,113,424 2,119 1,242 66,993 9,183,778 Total loans (a) $ 22,240,647 $ 251,934 $ 133,189 $ 128,939 $ 22,754,710 (a) During the third quarter of 2019, the Corporation sold approximately $240 million of portfolio mortgages. In addition, the Corporation sold $33 million of residential mortgages and home equity loans, of which $21 million were pass loans and $12 million were nonaccrual loans. The following table presents commercial and consumer loans by credit quality indicator at December 31, 2018 : ($ in Thousands) Pass Special Mention Potential Problem Nonaccrual Total 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, which 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 September 30, 2019 : Accruing ($ in Thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total Commercial and industrial $ 7,438,395 $ 220 $ 206 $ 266 $ 56,536 $ 7,495,623 Commercial real estate - owner occupied 912,810 2,646 — — 68 915,524 Commercial and business lending 8,351,205 2,867 206 266 56,604 8,411,147 Commercial real estate - investor 3,797,840 — 636 — 4,800 3,803,277 Real estate construction 1,355,371 571 24 — 542 1,356,508 Commercial real estate lending 5,153,211 571 661 — 5,342 5,159,784 Total commercial 13,504,416 3,438 866 266 61,946 13,570,932 Residential mortgage 7,889,681 7,866 197 — 57,056 7,954,801 Home equity 865,017 3,837 961 — 9,828 879,642 Other consumer 345,303 1,321 881 1,720 109 349,335 Total consumer 9,100,001 13,025 2,038 1,720 66,993 9,183,778 Total loans (b) $ 22,604,417 $ 16,462 $ 2,905 $ 1,986 $ 128,939 $ 22,754,710 (a) Of the total nonaccrual loans, $47 million , or 36% , were current with respect to payment at September 30, 2019 . (b)During the third quarter of 2019, the Corporation sold approximately $240 million of portfolio mortgages. In addition, the Corporation sold $33 million of residential mortgages and home equity loans, of which $21 million were accruing current loans, $12 million were nonaccrual loans, and approximately $200,000 were 30-89 days past due accruing loans. The following table presents loans by past due status at December 31, 2018 : Accruing ($ in Thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total 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 $2 million of purchased credit-impaired loans, at September 30, 2019 : ($ in Thousands) Recorded Unpaid Related Average Interest Loans with a related allowance Commercial and industrial $ 48,597 $ 59,132 $ 17,791 $ 45,439 $ 1,003 Commercial real estate — owner occupied 1,912 1,919 19 1,988 78 Commercial and business lending 50,510 61,051 17,811 47,427 1,081 Commercial real estate — investor 1,400 2,575 101 780 21 Real estate construction 409 490 56 419 21 Commercial real estate lending 1,809 3,066 157 1,199 42 Total commercial 52,319 64,116 17,968 48,626 1,123 Residential mortgage 24,621 25,783 3,824 27,173 623 Home equity 3,604 4,011 1,313 6,796 136 Other consumer 1,244 1,246 187 1,246 1 Total consumer 29,468 31,041 5,323 35,214 760 Total loans with a related allowance $ 81,787 $ 95,157 $ 23,291 $ 83,840 $ 1,883 Loans with no related allowance Commercial and industrial $ 21,971 $ 59,697 $ — $ 14,448 $ — Commercial real estate — owner occupied — — — — — Commercial and business lending 21,971 59,697 — 14,448 — Commercial real estate — investor 3,705 3,705 — 637 159 Real estate construction — — — — — Commercial real estate lending 3,705 3,705 — 637 159 Total commercial 25,675 63,402 — 15,086 159 Residential mortgage 11,418 11,732 — 8,732 279 Home equity 1,044 1,063 — 1,017 18 Other consumer — — — — — Total consumer 12,462 12,795 — 9,749 297 Total loans with no related allowance $ 38,138 $ 76,197 $ — $ 24,835 $ 456 Total Commercial and industrial $ 70,568 $ 118,829 $ 17,791 $ 59,887 $ 1,003 Commercial real estate — owner occupied 1,912 1,919 19 1,988 78 Commercial and business lending 72,480 120,748 17,811 61,875 1,081 Commercial real estate — investor 5,104 6,280 101 1,417 180 Real estate construction 409 490 56 419 21 Commercial real estate lending 5,514 6,770 157 1,836 201 Total commercial 77,994 127,518 17,968 63,712 1,282 Residential mortgage 36,039 37,515 3,824 35,905 902 Home equity 4,648 5,075 1,313 7,812 154 Other consumer 1,244 1,246 187 1,246 1 Total consumer 41,931 43,836 5,323 44,964 1,056 Total loans (a) $ 119,925 $ 171,354 $ 23,291 $ 108,675 $ 2,338 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 56% of the unpaid principal balance at September 30, 2019 . The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $5 million of purchased credit-impaired loans, at December 31, 2018 : ($ in Thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized 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 with a related allowance $ 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 with no related allowance $ 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 following table presents nonaccrual and performing restructured loans by loan portfolio: September 30, 2019 December 31, 2018 ($ in Thousands) Performing Restructured Loans Nonaccrual Restructured Loans (a) Performing Restructured Loans Nonaccrual Restructured Loans (a) Commercial and industrial $ 15,398 $ — $ 25,478 $ 249 Commercial real estate — owner occupied 1,912 — 2,080 — Commercial real estate — investor 304 461 799 933 Real estate construction 227 182 311 198 Residential mortgage 3,228 14,090 16,036 22,279 Home equity 2,017 1,559 7,385 2,627 Other consumer 1,243 1 1,174 6 Total restructured loans (b) $ 24,329 $ 16,293 $ 53,263 $ 26,292 (a) Nonaccrual restructured loans have been included within nonaccrual loans. (b) During the third quarter of 2019, the Corporation sold $21 million of performing restructured loans, of which $18 million were residential mortgages and $3 million were home equity loans. In addition, the Corporation sold $7 million of nonaccrual restructured residential mortgage loans. The Corporation had a recorded investment of $7 million in loans modified in troubled debt restructurings during the nine months ended September 30, 2019 , of which $2 million were in accrual status and $5 million were in nonaccrual pending a sustained period of repayment. The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio, the recorded investment and unpaid principal balance for the nine months ended September 30, 2019 and 2018 : Nine Months Ended September 30, 2019 Nine Months Ended September 30, 2018 ($ in Thousands) Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 1 $ 185 $ 185 6 $ 1,954 $ 1,995 Commercial real estate — investor — — — 1 958 1,022 Residential mortgage 47 6,785 6,863 29 5,655 5,733 Home equity 18 520 520 32 1,552 1,582 Other consumer 1 9 9 3 19 21 Total loans modified 67 $ 7,500 $ 7,577 71 $ 10,138 $ 10,353 (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 nine months ended September 30, 2019 , restructured loan modifications of commercial and industrial, and commercial real estate primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of residential mortgage, home equity, and other consumer loans primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the nine months ended September 30, 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 nine months ended September 30, 2019 and 2018 and the recorded investment in these restructured loans as of September 30, 2019 and 2018 : Nine Months Ended September 30, 2019 Nine Months Ended September 30, 2018 ($ in Thousands) Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial and industrial — $ — 3 $ — Commercial real estate — investor 1 461 — — Residential mortgage 27 4,528 12 2,579 Home equity 19 538 28 1,599 Total loans modified 47 $ 5,526 43 $ 4,178 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 nine months ended September 30, 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 (49,845 ) (222 ) — (60 ) (1,754 ) (1,605 ) (4,074 ) (57,560 ) Recoveries 10,322 2,795 31 230 539 1,878 667 16,462 Net Charge offs (39,523 ) 2,573 31 170 (1,215 ) 273 (3,407 ) (41,098 ) Provision for loan losses 36,419 (3,229 ) (971 ) (4,960 ) (5,757 ) (7,690 ) 3,688 17,500 September 30, 2019 $ 105,730 $ 8,599 $ 39,904 $ 23,451 $ 18,623 $ 11,849 $ 6,269 $ 214,425 Allowance for loan losses Individually evaluated for impairment $ 17,791 $ 19 $ 101 $ 56 $ 3,824 $ 1,313 $ 187 $ 23,291 Collectively evaluated for impairment 87,939 8,579 39,803 23,395 14,799 10,536 6,082 191,133 Total allowance for loan losses $ 105,730 $ 8,599 $ 39,904 $ 23,451 $ 18,623 $ 11,849 $ 6,269 $ 214,425 Loans Individually evaluated for impairment $ 70,568 $ 1,912 $ 5,104 $ 409 $ 36,039 $ 4,648 $ 1,244 $ 119,925 Collectively evaluated for impairment 7,424,690 912,935 3,798,039 1,356,088 7,918,265 874,968 348,091 22,633,075 Acquired and accounted for under ASC 310-30 (a) 365 677 134 11 497 26 — 1,710 Total loans $ 7,495,623 $ 915,524 $ 3,803,277 $ 1,356,508 $ 7,954,801 $ 879,642 $ 349,335 $ 22,754,710 (a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality." For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2018 , was as follows: ($ in Thousands) Commercial and Commercial real estate - owner occupied 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 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 related to the oil and gas portfolio was $21 million , or 3.7% of total oil and gas loans, and $12 million , or 1.6% of total oil and gas loans, at September 30, 2019 and December 31, 2018 , respectively. The following table provides a summary of the changes in allowance for loan losses in the Corporation's oil and gas loan portfolio at September 30, 2019 and December 31, 2018 : ($ in Millions) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Balance at beginning of period $ 12 $ 27 Charge offs (39 ) (24 ) Recoveries 5 6 Net Charge offs (34 ) (17 ) Provision for loan losses 44 2 Balance at end of period $ 21 $ 12 Allowance for loan losses Individually evaluated for impairment $ 11 $ — Collectively evaluated for impairment 10 12 Total allowance for loan losses $ 21 $ 12 Loans Individually evaluated for impairment $ 36 $ 22 Collectively evaluated for impairment 545 725 Total loans $ 582 $ 747 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: ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 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 70 2,436 Balance at end of period $ 22,907 $ 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 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 nine months ended September 30, 2019 and for the year ended December 31, 2018 : ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Changes in Accretable Yield Balance at beginning of period $ 1,482 $ — Purchases — 4,853 Accretion (912 ) (4,954 ) Net reclassification from non-accretable yield 23 1,605 Other (a) — (22 ) Balance at end of period $ 595 $ 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. The Corporation's Huntington branch acquisition included no purchased credit-impaired loans. At September 30, 2019 , the Corporation had a total of approximately $15 million in net unaccreted purchase discount, of which approximately $14 million was related to performing loans and approximately $1 million was related to the Corporation's purchased credit-impaired loans. At December 31, 2018 , the Corporation had a total of approximately $20 million in net unaccreted purchase discount, of which approximately $18 million was related to performing loans and approximately $2 million

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 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 2019, 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 2019 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2018 or the first nine months of 2019 . At both September 30, 2019 and December 31, 2018 , the Corporation had goodwill of $1.2 billion . There was an increase of $7 million during the second quarter of 2019 related to the Huntington branch acquisition, and an adjustment of approximately $210,000 in the third quarter of 2019 driven by an update that decreased the fair value of furniture acquired. Other Intangible Assets The Corporation has other intangible assets that are amortized, consisting of CDI, other intangibles (primarily related to customer relationships acquired in connection with the Corporation’s insurance agency acquisitions), and MSR. For CDI and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Core deposit intangibles Gross carrying amount $ 80,730 $ 58,100 Accumulated amortization (10,438 ) (5,326 ) Net book value $ 70,292 $ 52,774 Additions during the period $ 22,630 $ 58,100 Amortization during the year $ 5,112 $ 5,326 Other intangibles Gross carrying amount $ 44,887 $ 44,931 Reductions due to sale (140 ) (43 ) Accumulated amortization (23,950 ) (21,825 ) Net book value $ 20,797 $ 23,062 Additions during the period $ — $ 10,359 Amortization during the year $ 2,125 $ 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 MSR 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 MSR asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the MSR 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 MSR 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 MSR 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 MSR asset. A summary of changes in the balance of the MSR asset and the MSR valuation allowance is as follows: ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 68,433 $ 59,168 Additions from acquisition — 8,136 Additions 8,900 10,722 Amortization (8,749 ) (9,594 ) Mortgage servicing rights at end of period $ 68,584 $ 68,433 Valuation allowance at beginning of period $ (239 ) $ (784 ) (Additions) recoveries, net (177 ) 545 Valuation allowance at end of period $ (416 ) $ (239 ) Mortgage servicing rights, net $ 68,168 $ 68,193 Fair value of mortgage servicing rights $ 70,241 $ 81,012 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 8,688,012 $ 8,600,983 Mortgage servicing rights, net to servicing portfolio 0.78 % 0.79 % Mortgage servicing rights expense (a) $ 8,926 $ 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 September 30, 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: ($ in Thousands) Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights Three Months Ending December 31, 2019 $ 2,018 $ 693 $ 3,234 2020 8,073 2,690 12,262 2021 8,073 2,666 10,074 2022 8,073 2,642 8,259 2023 8,073 2,623 6,777 2024 8,073 2,603 5,574 Beyond 2024 27,909 6,879 22,403 Total Estimated Amortization Expense $ 70,292 $ 20,797 $ 68,584

Short and Long-Term Funding

Short and Long-Term Funding	9 Months Ended
	Sep. 30, 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): ($ in Thousands) September 30, 2019 December 31, 2018 Short-Term Funding Federal funds purchased $ 75 $ 19,710 Securities sold under agreements to repurchase 77,953 91,941 Federal funds purchased and securities sold under agreements to repurchase 78,028 111,651 Commercial paper 30,416 45,423 Total short-term funding $ 108,444 $ 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 (3,201 ) (4,389 ) Total long-term funding 796,799 795,611 Total short and long-term funding, excluding FHLB advances $ 905,243 $ 952,685 FHLB Advances Short-term FHLB advances $ 215,000 $ 900,000 Long-term FHLB advances 2,662,727 2,674,371 Total FHLB advances $ 2,877,727 $ 3,574,371 Total short and long-term funding $ 3,782,970 $ 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 September 30, 2019 , the Corporation pledged agency mortgage-related securities with a fair value of $164 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of September 30, 2019 and December 31, 2018 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total September 30, 2019 Repurchase agreements Agency mortgage-related securities $ 77,953 $ — $ — $ — $ 77,953 Total $ 77,953 $ — $ — $ — $ 77,953 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 , the Bank 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 had a fixed coupon interest rate of 2.75% and were issued at a discount. On October 15, 2019 , these notes were redeemed in full. 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 September 30, 2019 , the Corporation had $2.9 billion of FHLB advances, down $ 697 million from December 31, 2018 . At September 30, 2019 , the Corporation had $2.4 billion of putable FHLB advances with a one-time option where the FHLB can call the advance prior to the contractual maturity. The contractual weighted average life to the put date of these advances was 0.36 years, with put dates ranging from 2019 through 2020. The weighted average life to contractual maturity on these advances was 5.42 years, with those dates ranging from 2022 through 2028. As of September 30, 2019 , due to the lower rate environment, it is probable that none of these advances will be called by the FHLB and will extend to their final maturities. The original contractual maturity or next put date of the Corporation's FHLB advances as of September 30, 2019 and December 31, 2018 are presented in the following table: September 30, 2019 December 31, 2018 ($ in Thousands) Amount Weighted Average Contractual Coupon Rate Amount Weighted Average Contractual Coupon Rate Maturity or put date 1 year or less $ 2,376,052 2.24 % $ 2,262,584 2.06 % After 1 but within 2 288,174 2.57 % 1,285,039 2.39 % After 2 but within 3 5,781 5.11 % 14,393 2.98 % After 3 years 207,720 2.30 % 12,354 4.55 % FHLB advances and overall rate $ 2,877,727 2.28 % $ 3,574,371 2.19 %

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Sep. 30, 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, contracts generally contain language outlining collateral pledging requirements for each counterparty. For non-centrally cleared derivatives, collateral must be posted when the market value exceeds certain mutually agreed upon threshold limits. Securities and cash are often pledged as collateral. The Corporation pledged $47 million of investment securities as collateral at September 30, 2019 , and pledged $36 million of investment securities as collateral at December 31, 2018 . At September 30, 2019 , the Corporation posted $15 million of cash collateral compared to $1 million at December 31, 2018 . Federal regulations require the Corporation to clear all LIBOR interest rate swaps through a clearing house, if possible. For derivatives cleared through central clearing houses the variation margin payments are legally characterized as daily settlements of the derivative rather than collateral. The Corporation's clearing agent for interest rate derivative contracts that are centrally cleared through the Chicago Mercantile Exchange (CME) and the London Clearing House (LCH) settles the variation margin daily. As a result, the variation margin payment and the related derivative instruments are considered a single unit of account for accounting and financial reporting purposes. Depending on the net position, the fair value is reported in other assets or accrued expenses and other liabilities on the consolidated balance sheets. The daily settlement of the derivative exposure does not change or reset the contractual terms of the instrument. 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 in other assets and accrued expenses and other liabilities 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 in other assets and accrued expenses and other liabilities 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 following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of September 30, 2019 and December 31, 2018 . The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of September 30, 2019 and December 31, 2018 . The resulting net derivative asset and liability fair values are included in other assets and accrued expenses and other liabilities, respectively, on the consolidated balance sheets. September 30, 2019 December 31, 2018 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Designated as hedging instruments Interest rate-related instruments $ 500,000 $ 114 $ — $ — $ — $ — $ 500,000 $ 40 Not designated as hedging instruments Interest rate-related instruments 2,799,863 100,376 2,799,863 17,586 2,707,204 52,796 2,707,204 52,653 Foreign currency exchange forwards 211,475 3,153 184,476 2,823 117,879 721 69,153 675 Commodity contracts 259,210 25,388 258,483 24,758 331,727 35,426 315,861 34,340 Mortgage banking (a) 300,515 2,017 227,060 590 191,222 2,208 139,984 2,072 Time deposits 518 13 518 13 11,185 109 11,185 109 Total not designated as hedging instruments 130,947 45,770 91,260 89,849 Gross derivatives before netting 131,061 45,770 91,260 89,889 Less: Legally enforceable master netting agreements 4,629 4,629 5,322 5,322 Less: Cash collateral pledged/received 16,182 14,680 27,593 63 Total derivative instruments, after netting (b) $ 110,250 $ 26,461 $ 58,345 $ 84,504 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. (b) The fair values of derivative assets are included in other assets, while the fair values of derivative liabilities are included in accrued expenses and other liabilities, in the consolidated balance sheets. The following table presents amounts that were recorded on the consolidated balance sheets related to cumulative basis adjustments for fair value hedges: Line Item in the Consolidated Balance Sheets 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) September 30, 2019 Loans and investment securities receivables (a) $ 506,111 $ 6,111 Total $ 506,111 $ 6,111 (a) These amounts include the amortized cost basis of closed portfolios used in designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At September 30, 2019 , the amortized cost basis of the closed portfolios used in these hedging relationships was $947 million ; the positive cumulative basis adjustments associated with these hedging relationships was $6 million; and the amounts of the designated hedged items were $500 million . The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2019 and 2018 : Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 ($ in Thousands) Interest Income Other Income (Expense) Interest Income Other Income (Expense) 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 the fair value hedge is recorded $ (59 ) $ — $ (17 ) $ — $ 160 $ — $ (30 ) $ — The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items 452 — (2,522 ) — 6,674 — (4,931 ) — Derivatives designated as hedging instruments (a) (511 ) — 2,506 — (6,514 ) — 4,902 — (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 for the three and nine months ended September 30, 2019 and 2018 : Consolidated Statements of Income Category of Gain / (Loss) Recognized in Income Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ (619 ) $ 246 $ (2,309 ) $ 354 Foreign currency exchange forwards Capital markets, net 72 (92 ) 284 (22 ) Commodity contracts Capital markets, net 208 (72 ) (456 ) (958 ) Interest rate lock commitments (mortgage) Mortgage banking, net (2,851 ) (1,602 ) (191 ) 147 Forward commitments (mortgage) Mortgage banking, net 1,313 2,271 1,482 1,665

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2019
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate-Related Instruments, Commodity Contracts, and Foreign Exchange Forwards (“Interest, Commodity, and Foreign Exchange Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers, commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, and foreign exchange forwards to manage customers' exposure to fluctuating foreign exchange rates. The Corporation mitigates these risks by entering into equal and offsetting 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, commodity, and foreign exchange 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. Derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral, in other assets and accrued expenses and other liabilities, on the face of the consolidated balance sheets. In the third quarter of 2019, the Corporation elected to offset derivative assets and liabilities and cash collateral with the same counterparty where it has a legally enforceable master netting agreement in place. See the derivatives section within Note 3 for additional information on the change in accounting policy and 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, commodity and foreign exchange 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 Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Liabilities Offset Cash Collateral Received Net amount Derivative assets (a) September 30, 2019 $ 24,930 $ (4,629 ) $ (16,182 ) $ 4,118 $ — $ 4,118 December 31, 2018 65,596 (5,322 ) (27,593 ) 32,681 (31,837 ) 843 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Assets Offset Cash Collateral Pledged Net amount Derivative liabilities (a) September 30, 2019 $ 19,537 $ (4,629 ) $ (14,680 ) $ 228 $ — $ 228 December 31, 2018 22,951 (5,322 ) (63 ) 17,567 (17,551 ) 16 (a) Includes interest, commodity, and foreign exchange agreements

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	9 Months Ended
	Sep. 30, 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: ($ in Thousands) September 30, 2019 December 31, 2018 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 8,909,815 $ 8,720,293 Commercial letters of credit (a) 8,119 7,599 Standby letters of credit (c) 272,376 255,904 (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 was not material at September 30, 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 $3 million and $2 million at September 30, 2019 and December 31, 2018 , respectively, 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 $23 million at September 30, 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, new market projects, and opportunity zone funds for the purpose of community reinvestment and obtaining tax credits and other tax benefits. Return on the Corporation's investment in these projects and funds comes in the form of the tax credits and tax losses that pass through to the Corporation and deferral or elimination of capital gain recognition for tax purposes. The aggregate carrying value of these investments at September 30, 2019 was $224 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 $14 million and $13 million for the nine months ended September 30, 2019 and 2018 , respectively, and $4 million for both the three months ended September 30, 2019 and 2018 . The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $210 million at September 30, 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 $112 million and $51 million at September 30, 2019 and December 31, 2018 , respectively. For the nine months ended September 30, 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 $26 million and $25 million at September 30, 2019 and December 31, 2018 , respectively, 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 and intends to continue to defend itself vigorously with respect to such legal proceedings. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of 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 $2 million for both the nine months ended September 30, 2019 and for the year ended December 31, 2018 . The loss reimbursement and settlement claims paid for the nine months ended September 30, 2019 and for the year ended December 31, 2018 were negligible . Make whole requests during 2018 and the first nine 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 $12.2 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of September 30, 2019 , approximately $7.6 billion of these sold loans remain outstanding. The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The following summarizes the changes in the mortgage repurchase reserve for the nine months ended September 30, 2019 and for the year ended December 31, 2018 : ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Balance at beginning of period $ 752 $ 987 Repurchase provision expense 309 345 Adjustments to provision expense — (450 ) Repurchase/reimbursement charges taken (299 ) (218 ) Amount recorded at acquisition — 88 Balance at end of period $ 762 $ 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 September 30, 2019 and December 31, 2018 , there were approximately $44 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 September 30, 2019 and December 31, 2018 , there were $48 million and $57 million , respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 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 with readily determinable fair values 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 within Level 1 of the fair value hierarchy. See Note 6 for additional disclosure regarding the Corporation’s equity 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 interest rate-related 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 September 30, 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 within 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 commodity derivative financial instruments fall within Level 2 of the fair value hierarchy, the credit valuation adjustments utilize Level 3 inputs, such as probability of default and loss given default of the underlying loans 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 September 30, 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 September 30, 2019 and December 31, 2018 , aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy September 30, 2019 December 31, 2018 Assets Investment securities available for sale U.S. Treasury securities Level 1 $ — $ 999 Obligations of state and political subdivisions (municipal securities) Level 2 553,418 — Residential mortgage-related securities FNMA / FHLMC Level 2 143,009 295,252 GNMA Level 2 1,080,584 2,128,531 Private-label Level 2 758 1,003 Commercial mortgage-related securities FNMA / FHLMC Level 2 21,791 — GNMA Level 2 1,363,948 1,220,797 FFELP asset backed securities Level 2 269,789 297,360 Other debt securities Level 2 2,993 3,000 Total investment securities available for sale Level 1 $ — $ 999 Total investment securities available for sale Level 2 $ 3,436,289 $ 3,945,943 Equity securities with readily determinable fair values Level 1 1,652 1,568 Residential loans held for sale Level 2 137,655 64,321 Interest rate-related instruments (a) Level 2 100,376 52,796 Foreign currency exchange forwards (a) Level 2 3,153 721 Commodity contracts (a) Level 2 25,388 35,426 Purchased options (time deposit) Level 2 13 109 Interest rate products (designated as hedging instruments) Level 2 114 — Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 2,017 2,208 Liabilities Interest rate-related instruments (a) Level 2 $ 17,586 $ 52,653 Foreign currency exchange forwards (a) Level 2 2,823 675 Commodity contracts (a) Level 2 24,758 34,340 Written options (time deposit) Level 2 13 109 Interest rate products (designated as hedging instruments) Level 2 — 40 Forward commitments to sell residential mortgage loans Level 3 590 2,072 (a) Figures are presented gross before netting. See Note 10 Derivative and Hedging Activities and Note 11 Balance Sheet Offsetting for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place. The table below presents a rollforward of the consolidated balance sheets amounts for the nine months ended September 30, 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: ($ in Thousands) Derivative Financial Instruments 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) 1,292 Balance September 30, 2019 $ 1,428 For Level 3 assets and liabilities measured at fair value on a recurring basis as of September 30, 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 September 30, 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 MBS 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. OREO: Certain OREO, 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 OREO, less estimated selling costs. The fair value of OREO, 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 September 30, 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 MSR 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 MSR. The valuation model incorporates prepayment assumptions to project MSR cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the MSR. 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 MSR, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, MSR 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 MSR assets. The discounted cash flow analyses that generate expected market prices utilize the observable characteristics of the MSR 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 either 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 MSR. Equity Securities Without Readily Determinable Fair Values: The Corporation measures equity securities without readily determinable fair values at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer, with such changes recognized in earnings. Included in equity securities without readily determinable fair values are 77,000 Visa Class B restricted shares carried at fair value. These shares are currently subject to certain transfer restrictions and will be convertible into Visa Class A shares upon final resolution of certain litigation matters involving Visa. Based on the current conversion factor, the Corporation expects 77,000 shares of Visa Class B to convert to 124,956 shares of Visa Class A upon the litigation resolution. In its determination of the new carrying values upon observable price changes, the Corporation will adjust the prices if deemed necessary to arrive at the Corporation's estimated fair values. Such adjustments may include adjustments to reflect the different rights and obligations of similar securities and other adjustments. See Note 6 for additional disclosure regarding the Corporation’s equity securities without readily determinable fair values. The following table presents the carrying value of equity securities without readily determinable fair values still held as of September 30, 2019 that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of September 30, 2019 : ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2018 $ — Upward carrying value changes 13,444 Carrying value as of September 30, 2019 $ 13,444 Cumulative upward carrying value changes between January 1, 2018 and September 30, 2019 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2019 $ — 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 September 30, 2019 Assets Impaired loans (a) Level 3 $ 51,501 Provision for credit losses (b) $ (60,627 ) OREO (c) Level 2 2,413 Other noninterest expense (1,453 ) Mortgage servicing rights Level 3 70,241 Mortgage banking, net (177 ) Equity securities Level 3 13,444 Investment securities gains (losses), net 13,444 December 31, 2018 Assets Impaired loans (a) Level 3 $ 26,191 Provision for credit losses (b) $ (14,521 ) OREO (c) Level 2 2,200 Other noninterest expense (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 MSR 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 September 30, 2019 Mortgage servicing rights Discounted cash flow Discount rate 9% Mortgage servicing rights Discounted cash flow Constant prepayment rate 13% Impaired Loans Appraisals / Discounted cash flow Collateral / Discount factor 48% 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: September 30, 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 $ 523,435 $ 523,435 $ 507,187 $ 507,187 Interest-bearing deposits in other financial institutions Level 1 236,010 236,010 221,226 221,226 Federal funds sold and securities purchased under agreements to resell Level 1 100 100 148,285 148,285 Investment securities held to maturity Level 1 999 1,019 — — Investment securities held to maturity Level 2 2,199,420 2,280,265 2,740,511 2,710,271 Investment securities available for sale Level 1 — — 999 999 Investment securities available for sale Level 2 3,436,289 3,436,289 3,945,943 3,945,943 Equity securities with readily determinable fair values Level 1 1,652 1,652 1,568 1,568 Equity securities without readily determinable fair values Level 3 13,444 13,444 — — FHLB and Federal Reserve Bank stocks Level 2 207,443 207,443 250,534 250,534 Residential loans held for sale Level 2 137,655 137,655 64,321 64,321 Commercial loans held for sale Level 2 11,597 11,597 14,943 14,943 Loans, net Level 3 22,540,285 22,422,568 22,702,406 22,317,395 Bank and corporate owned life insurance Level 2 670,739 670,739 663,203 663,203 Derivatives (other assets) (a) Level 2 129,044 129,044 89,052 89,052 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 2,017 2,017 2,208 2,208 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 21,512,804 $ 21,512,804 $ 22,081,992 $ 22,081,992 Brokered CDs and other time deposits (b) Level 2 2,909,759 2,910,112 2,815,401 2,815,401 Short-term funding (c) Level 2 108,444 108,444 157,074 157,074 Long-term funding Level 2 796,799 842,196 795,611 826,612 FHLB advances Level 2 2,877,727 2,938,923 3,574,371 3,565,572 Standby letters of credit (d) Level 2 2,715 2,715 2,482 2,482 Derivatives (accrued expenses and other liabilities) (a) Level 2 45,180 45,180 87,817 87,817 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 590 590 2,072 2,072 (a) Figures are presented gross before netting. See Note 10 Derivative and Hedging Activities and Note 11 Balance Sheet Offsetting for information relating to the impact of netting derivative assets and derivative liabilities as well as the impact from offsetting cash collateral paid to the same derivative counterparty where there is a legally enforceable master netting agreement in place. (b) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (c) The carrying amount is a reasonable estimate of fair value for existing short-term funding. (d) The commitment on standby letters of credit was $272 million at September 30, 2019 and $256 million at December 31, 2018 . See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 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 eight months of Bank Mutual expense due to the timing of the Bank Mutual acquisition. The Huntington branch acquisition closed on June 14, 2019 , and the employees gained as a result of the transaction became eligible to participate in the RAP on the same date, with their vesting service credit based on their prior hours of service with Huntington. 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 and nine months ended September 30, 2019 and 2018 were as follows: Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Components of Net Periodic Benefit Cost RAP Service cost $ 1,598 $ 1,885 $ 5,448 $ 5,670 Interest cost 2,489 1,682 7,314 5,002 Expected return on plan assets (6,099 ) (4,777 ) (18,249 ) (14,287 ) Amortization of prior service cost (18 ) (18 ) (55 ) (56 ) Amortization of actuarial loss 230 549 360 1,474 Total net periodic pension cost $ (1,800 ) $ (680 ) $ (5,183 ) $ (2,197 ) Bank Mutual Pension Plan Interest cost N/A $ 654 N/A $ 1,737 Expected return on plan assets N/A (1,220 ) N/A (2,812 ) Total net periodic pension cost N/A $ (566 ) N/A $ (1,075 ) Postretirement Plan Interest cost $ 26 $ 27 $ 78 $ 80 Amortization of prior service cost (19 ) (19 ) (56 ) (56 ) Amortization of actuarial loss (1 ) 2 (3 ) 6 Total net periodic benefit cost $ 6 $ 11 $ 19 $ 30 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 nine months ended September 30, 2019 . The Corporation made a $6 million contribution to the Bank Mutual Pension Plan and a $4 million contribution to the RAP during the third quarter of 2018, as well as a $31 million contribution to the Bank Mutual Pension Plan during the second quarter of 2018.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 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 and Note 3 in this Quarterly Report on Form 10-Q, 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. GAAP. 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 taxes, 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). All Bank Mutual and Huntington branch 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 September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 110,929 $ 113,298 $ 342,486 $ 339,718 Net intersegment interest income (expense) (17,318 ) (13,018 ) (60,000 ) (36,151 ) Segment net interest income 93,612 100,280 282,485 303,567 Noninterest income 13,452 12,280 39,215 39,156 Total revenue 107,063 112,560 321,700 342,723 Credit provision 12,912 11,232 39,713 32,955 Noninterest expense 39,172 41,828 117,982 122,853 Income (loss) before income taxes 54,979 59,500 164,005 186,914 Income tax expense (benefit) 9,670 12,098 30,536 36,978 Net income $ 45,309 $ 47,402 $ 133,469 $ 149,937 Allocated goodwill $ 525,836 $ 524,525 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 81,517 $ 91,323 $ 254,463 $ 268,137 Net intersegment interest income (expense) 27,651 21,951 76,679 63,301 Segment net interest income 109,167 113,275 331,142 331,438 Noninterest income 81,133 73,838 233,692 224,124 Total revenue 190,300 187,113 564,834 555,562 Credit provision 5,008 5,280 15,007 15,125 Noninterest expense 137,761 139,627 406,984 405,129 Income (loss) before income taxes 47,532 42,206 142,843 135,307 Income tax expense (benefit) 9,982 8,863 30,003 28,415 Net income $ 37,550 $ 33,343 $ 112,839 $ 106,893 Allocated goodwill $ 650,394 $ 644,397 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 13,919 $ 14,770 $ 38,583 $ 47,770 Net intersegment interest income (expense) (10,333 ) (8,933 ) (16,679 ) (27,150 ) Segment net interest income 3,586 5,837 21,905 20,620 Noninterest income 6,265 2,183 14,983 8,242 Total revenue 9,852 8,019 36,888 28,861 Credit provision (15,919 ) (21,512 ) (38,721 ) (49,081 ) Noninterest expense (a) 23,981 22,959 65,399 100,654 Income (loss) before income taxes 1,790 6,572 10,209 (22,712 ) Income tax expense (benefit) 1,295 1,388 1,816 (10,460 ) Net income $ 495 $ 5,185 $ 8,393 $ (12,252 ) Allocated goodwill $ — $ — Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 206,365 $ 219,392 $ 635,532 $ 655,625 Net intersegment interest income (expense) — — — — Segment net interest income 206,365 219,392 635,532 655,625 Noninterest income 100,850 88,300 287,890 271,522 Total revenue 307,216 307,692 923,422 927,146 Credit provision 2,000 (5,000 ) 16,000 (1,000 ) Noninterest expense 200,930 204,413 590,380 628,636 Income (loss) before income taxes 104,286 108,279 317,042 299,510 Income tax expense (benefit) 20,947 22,349 62,356 54,932 Net income $ 83,339 $ 85,929 $ 254,686 $ 244,578 Allocated goodwill $ 1,176,230 $ 1,168,922 (a) For the three months ended both September 30, 2019 and 2018 , the Risk Management and Shared Services segment included approximately $2 million of acquisition related noninterest expense. For the nine months ended September 30, 2019 and 2018 , the Risk Management and Shared Services segment included approximately $6 million and $30 million , respectively, of acquisition related noninterest expense.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 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 September 30, 2019 and 2018 , including changes during the preceding nine and three month periods as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Securities Available For Sale Defined Benefit Pension and Post Retirement Obligations Accumulated Other Comprehensive Income (Loss) Balance January 1, 2019 $ (75,643 ) $ (49,330 ) $ (124,972 ) Other comprehensive income (loss) before reclassifications 123,139 — 123,139 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (5,931 ) — (5,931 ) Personnel expense — (111 ) (111 ) Other expense — 357 357 Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities 279 — 279 Income tax (expense) benefit (29,651 ) (62 ) (29,713 ) Net other comprehensive income (loss) during period 87,836 184 88,020 Balance September 30, 2019 $ 12,194 $ (49,146 ) $ (36,953 ) Balance January 1, 2018 $ (38,453 ) $ (24,305 ) $ (62,758 ) Other comprehensive income (loss) before reclassifications (82,099 ) — (82,099 ) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities loss (gain), net 1,985 — 1,985 Personnel expense — (112 ) (112 ) Other expense — 1,480 1,480 Adjustment for adoption of ASU 2016-01 (84 ) — (84 ) Adjustment for adoption of ASU 2018-02 (8,419 ) (5,235 ) (13,654 ) Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (684 ) — (684 ) Income tax (expense) benefit 20,796 (390 ) 20,406 Net other comprehensive income (loss) during period (68,505 ) (4,257 ) (72,762 ) Balance September 30, 2018 $ (106,958 ) $ (28,562 ) $ (135,520 ) ($ in Thousands) Investments Defined Benefit Accumulated Balance July 1, 2019 $ (9,773 ) $ (49,290 ) $ (59,063 ) Other comprehensive income (loss) before reclassifications 33,173 — 33,173 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (3,788 ) — (3,788 ) Personnel expense — (36 ) (36 ) Other expense — 229 229 Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (8 ) — (8 ) Income tax (expense) benefit (7,410 ) (49 ) (7,458 ) Net other comprehensive income (loss) during period 21,967 144 22,111 Balance September 30, 2019 $ 12,194 $ (49,146 ) $ (36,953 ) Balance July 1, 2018 $ (90,986 ) $ (28,902 ) $ (119,888 ) Other comprehensive income (loss) before reclassifications (21,345 ) — (21,345 ) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities loss (gain), net (30 ) — (30 ) Personnel expense — (37 ) (37 ) Other expense — 551 551 Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (52 ) — (52 ) Income tax (expense) benefit 5,456 (174 ) 5,282 Net other comprehensive income (loss) during period (15,971 ) 340 (15,631 ) Balance September 30, 2018 $ (106,958 ) $ (28,562 ) $ (135,520 )

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 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 September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Service charges and deposit account fees $ 3,182 $ 3,669 $ 9,765 $ 11,680 Card-based fees (a) 336 353 1,001 1,014 Other revenue 809 88 (475 ) (69 ) Noninterest Income (in-scope of Topic 606) $ 4,326 $ 4,109 $ 10,291 $ 12,625 Noninterest Income (out-of-scope of Topic 606) 9,125 8,171 28,924 26,531 Total Noninterest Income $ 13,452 $ 12,280 $ 39,215 $ 39,156 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Insurance commissions and fees $ 21,041 $ 21,677 $ 69,483 $ 68,289 Wealth management fees (b) 21,015 21,224 61,885 61,932 Service charges and deposit account fees 13,367 13,210 37,293 37,984 Card-based fees (a) 10,120 9,489 28,829 28,449 Other revenue 2,803 2,918 8,175 8,411 Noninterest Income (in-scope of Topic 606) $ 68,346 $ 68,518 $ 205,666 $ 205,065 Noninterest Income (out-of-scope of Topic 606) 12,787 5,320 28,026 19,059 Total Noninterest Income $ 81,133 $ 73,838 $ 233,692 $ 224,124 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Insurance commissions and fees $ (87 ) $ (41 ) $ (80 ) $ (9 ) Wealth management fees (b) — — — 267 Service charges and deposit account fees 12 25 44 50 Card-based fees (a) 45 (15 ) 143 (9 ) Other revenue 71 122 310 282 Noninterest Income (in-scope of Topic 606) $ 41 $ 91 $ 417 $ 580 Noninterest Income (out-of-scope of Topic 606) 6,224 2,092 14,567 7,662 Total Noninterest Income $ 6,265 $ 2,183 $ 14,983 $ 8,242 Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Insurance commissions and fees $ 20,954 $ 21,636 $ 69,403 $ 68,279 Wealth management fees (b) 21,015 21,224 61,885 62,198 Service charges and deposit account fees 16,561 16,904 47,102 49,714 Card-based fees (a) 10,501 9,826 29,973 29,454 Other revenue 3,683 3,128 8,010 8,624 Noninterest Income (in-scope of Topic 606) $ 72,713 $ 72,718 $ 216,373 $ 218,270 Noninterest Income (out-of-scope of Topic 606) 28,137 15,583 71,517 53,252 Total Noninterest Income $ 100,850 $ 88,300 $ 287,890 $ 271,522 (a) Certain card-based fees are out-of-scope of Topic 606. (b) Includes trust, asset management, brokerage, and annuity 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 consist 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. Using the practical expedient, for contracts with a term of one year or less, the Corporation recognizes incremental costs of obtaining those contracts as an expense when incurred.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. These operating leases have original terms of 1 year or longer with remaining maturities up to 43 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 and cash flows resulting from operating lease are presented below: ($ in Thousands) Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Operating Lease Costs $ 2,708 $ 8,502 Operating Lease Cash Flows 2,968 8,538 The lease classifications on the consolidated balance sheets were as follows: September 30, 2019 ($ in Thousands) Amount Consolidated Balance Sheets Category Operating lease right-of-use asset $ 48,127 Premises and equipment Finance lease right-of-use asset — Other assets Operating lease liability 52,011 Accrued expenses and other liabilities Finance lease liability — Other long-term funding The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: September 30, 2019 ($ in Thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment $ 66 1.08 2.72 % Retail and corporate offices 54,202 6.63 3.36 % Land 6,425 12.11 3.34 % Total operating leases $ 60,693 7.40 3.36 % 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 Three Months Ending December 31, 2019 $ 4,070 2020 10,520 2021 9,828 2022 7,578 2023 5,450 Beyond 2023 23,248 Total lease payments 60,693 Less: interest 8,682 Present value of lease payments $ 52,011 As of September 30, 2019 , additional operating leases, primarily retail and corporate offices, that have not yet commenced total $16 million . These operating leases will commence between January 2020 and July 2023 with lease terms of 3 years to 6 years . Practical Expedients The Corporation elected several practical expedients made available by the FASB. Due to materiality, the Corporation elected not to restate comparative periods upon adoption of the new guidance. In addition, the Corporation elected the package of practical expedients whereby the Corporation did not reassess (i) whether existing contracts are, or contain, leases and (ii) lease classification for existing leases. Lastly, the Corporation elected not to separate lease and nonlease components in determining the consideration in the lease agreement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Leases	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. Leases with original terms of less than 12 months are not capitalized. 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.
Derivative and Hedging Activities	Derivative and Hedging Activities Derivative instruments, including derivative instruments embedded in other contracts, are carried at fair value on the consolidated balance sheets with changes in the fair value recorded to earnings or accumulated other comprehensive income, as appropriate. On the date the derivative contract is entered into, the Corporation designates the derivative as a fair value hedge (i.e., a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e., a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a free-standing derivative instrument. For a derivative designated as a fair value hedge, the changes in the fair value of the derivative instrument and the changes in the fair value of the hedged asset or liability are recognized in current period earnings as an increase or decrease to the carrying value of the hedged item on the balance sheet and in the related income statement account. Amounts within accumulated other comprehensive income are reclassified into earnings in the period the hedged item affects earnings. For a derivative designated as a free-standing derivative instrument, changes in fair value are reported in current period earnings. The free-standing derivative instruments included: interest rate risk management, commodity hedging, and foreign currency exchange solutions. The Corporation is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet. The Corporation uses master netting arrangements to mitigate counterparty credit risk in derivative transactions. To the extent the derivatives are subject to master netting arrangements, the Corporation takes into account the impact of master netting arrangements that allow the Corporation to settle all derivative contracts executed with the same counterparty on a net basis, and to offset the net derivative position with the related cash collateral. In the third quarter of 2019, the Corporation elected to offset derivative transactions with the same counterparty on the consolidated balance sheets when a derivative transaction has a legally enforceable master netting arrangement and when it is eligible for netting. Derivative balances and related cash collateral are presented net on the consolidated balance sheets. Refer to Change in Accounting Policy section within this note for additional discussion. In addition, the Corporation is exposed to changes in the fair value of certain 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. See Note 10 for additional information on derivative and hedging activities.
Change in Accounting Policy	Change in Accounting Policy The Corporation enters into ISDA master netting agreements with a portion of the Corporation’s derivative counterparties. Where legally enforceable, these master netting agreements give the Corporation, in the event of default by the counterparty, the right to liquidate securities and offset cash with the same counterparty. Under ASC 815-10-45-5, payables and receivables in respect of cash collateral received from or paid to a given counterparty can be offset against derivative fair values under a master netting arrangement. GAAP does not permit similar offsetting for security collateral. Prior to the third quarter of 2019, the Corporation elected to account for all derivatives’ fair values and related cash collateral on a gross basis on its consolidated balance sheets. In the third quarter of 2019, the Corporation elected to offset derivative assets and liabilities and cash collateral with the same counterparty where it has a legally enforceable master netting agreement in place. The change had no impact on either earnings or equity. The Corporation believes that this change is a preferable method of accounting as it provides a better reflection of the assets and liabilities on the face of the consolidated balance sheets. Adoption of this change is voluntary and has been adopted retrospectively with all prior periods presented herein being revised for comparability and as required. A reduction of $33 million was reflected between other assets as well as accrued expenses and other liabilities as of December 31, 2018 on the consolidated balance sheets.
Change in Accounting Estimate	Change in Accounting Estimate During the third quarter of 2019, the Corporation reassessed its estimate of the useful lives of certain fixed assets. The Corporation revised its original useful life estimate from 7 years to 12 years for furniture assets. This is considered a change in accounting estimate, per ASC 250-10, where adjustments should be made prospectively. The impact of this change in accounting estimate for third quarter of 2019 to net income in the consolidated statements of income and premises and equipment, net in the consolidated balance sheets was approximately $230,000 .
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2019-07 Codification Updates to SEC Sections-Amendments to SEC Paragraphs Pursuant to SEC Final Releases No. 33-10532, Disclosure Updates and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates The FASB issued this amendment to align the guidance in various SEC sections of the Codification with the requirements of certain SEC final rules. This amendment became effective upon issuance. 3rd Quarter 2019 No material impact on results of operations, financial position and liquidity. ASU 2019-04 Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments The FASB issued this amendment to clarify certain aspects of accounting for credit losses, hedging activities, and financial instruments. Within ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, the amendment allows an entity to designate partial-term fair value hedges of interest rate risk and measure the hedged item by using an assumed maturity, clarifies that an entity can start to amortize the hedged items basis adjustment in a fair value hedge, and it requires entities to disclose for fair value hedging relationships the carrying amounts of hedged assets and liabilities and the cumulative amount of fair value hedge basis adjustments. In addition, it permits a one-time election to reclassify securities that could be used in a hedge from held to maturity to available for sale without risk of tainting the remainder of the held to maturity portfolio. For entities that have adopted the amendments in Update 2017-12 as of the issuance date of this Update, the effective date is as of the beginning of the first annual period beginning after the issuance date of this Update. For those entities, early adoption was permitted, including adoption on any date on or after the issuance of this Update. 3rd Quarter 2019 During the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale. 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 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Entities were required to 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. Standard Description Date of adoption Effect on financial statements 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 ASU. 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 required 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 could 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. Future Accounting Pronouncements The expected impact of accounting pronouncements recently issued or proposed but not yet required to be adopted are displayed in the table below: Standard Description Date of anticipated adoption Effect on financial statements ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The FASB issued an amendment to replace the current incurred loss impairment methodology. Under the new guidance, entities will be required to measure expected credit losses by utilizing forward-looking information to assess an entity's allowance for credit losses. The guidance also requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. This amendment is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. ASU 2018-19 was issued to clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. ASU 2019-04 was issued and provides entities alternatives for measurement of accrued interest receivable, clarifies the steps entities should take when recording the transfer of loans or debt securities between measurement classifications or categories and clarifies that entities should include expected recoveries on financial assets. ASU 2019-05 was issued to provide entities that have certain instruments within the scope of Subtopic 320-20 with an option to irrevocably elect the fair value option in Subtopic 825-10. Early adoption is permitted. 1st Quarter 2020 The Corporation has developed a CECL allowance model which calculates reserves over the life of the loan and is largely driven by portfolio characteristics, risk-grading, economic outlook, and key methodology assumptions. Those assumptions are based upon the existing probability of default and loss given default framework and existing DFAST systems. The Corporation will utilize a single economic forecast over a 1-year reasonable and supportable forecast period with 1-year straight-line reversion to historical losses. The Corporation's cross functional team is currently performing parallel testing and sensitivity analysis and will refine the model as needed. The Corporation anticipates a 30-40% increase in the allowance for credit losses from projected year-end 2019 levels. A majority of the increase is the result of economic uncertainty. The total estimated impact equates to an approximately 25 bp net, after tax, reduction in expected tangible common equity. The Corporation anticipates increases in the longer dated portfolios and decreases in the shorter dated portfolios. The Corporation is in the process of finalizing model validations and approval of all models and assumptions through the steering committee which may have an impact on the estimate provided. The overall estimate for CECL is largely dependent on the composition of the portfolio, credit quality and economic conditions and forecasts at the time of adoption. Standard Description Date of anticipated adoption Effect on financial statements ASU 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement The FASB issued an amendment to add, modify, and remove disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the FASB Concepts Statement "Conceptual Framework for Financial Reporting", including the consideration of costs and benefits. The amendment is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted. 1st Quarter 2020 The Corporation is currently evaluating the impact on its results of operations, financial position and liquidity. ASU 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The FASB issued an amendment to simplify the subsequent quantitative measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Entities should apply the amendment prospectively. Early adoption is permitted, including in an interim period, for impairment tests performed after January 1, 2017. 2nd Quarter 2020, consistent with the Corporation's annual impairment test in May of each year. The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity. The Corporation has not had to perform a step one quantitative analysis since 2012, which concluded no impairment was necessary. ASU 2018-14 The FASB issued an amendment to modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments also added requirements to disclose the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The amendment also clarifies the disclosure requirements in paragraph 715-20-50-3, which states that certain information for defined benefit pension plans should be disclosed. The amendments in this Update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The amendment is effective for fiscal years ending after December 15, 2020. Entities should apply the amendments in this Update on a retrospective basis to all periods presented. Early adoption is permitted. 1st Quarter 2021 The Corporation is currently evaluating the impact on its results of operations, financial position and liquidity.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Huntington branch acquisition: ($ in Thousands) Purchase Accounting Adjustments June 14, 2019 Assets Cash and cash equivalents $ — $ 551,250 Loans (1,552 ) 116,346 Premises and equipment, net 4,800 22,430 Goodwill 7,286 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 22,630 22,630 OREO (included in other assets on the face of the consolidated balance sheets) (2,561 ) 5,263 Other assets — 559 Total assets $ 725,764 Liabilities Deposits $ 156 $ 725,173 Other liabilities 70 590 Total liabilities $ 725,764

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 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 September 30, For the Nine Months Ended September 30, (In Thousands, except per share data) 2019 2018 2019 2018 Net income $ 83,339 $ 85,929 $ 254,686 $ 244,578 Preferred stock dividends (3,801 ) (2,409 ) (11,402 ) (7,077 ) Net income available to common equity $ 79,539 $ 83,521 $ 243,285 $ 237,501 Common shareholder dividends (27,091 ) (25,486 ) (82,741 ) (77,035 ) Unvested share-based payment awards (198 ) (128 ) (506 ) (396 ) Undistributed earnings $ 52,250 $ 57,907 $ 160,037 $ 160,070 Undistributed earnings allocated to common shareholders 51,870 57,620 158,970 159,297 Undistributed earnings allocated to unvested share-based payment awards 380 288 1,067 772 Undistributed earnings $ 52,250 $ 57,907 $ 160,037 $ 160,070 Basic Distributed earnings to common shareholders $ 27,091 $ 25,486 $ 82,741 $ 77,035 Undistributed earnings allocated to common shareholders 51,870 57,620 158,970 159,297 Total common shareholders earnings, basic $ 78,961 $ 83,106 $ 241,711 $ 236,332 Diluted Distributed earnings to common shareholders $ 27,091 $ 25,486 $ 82,741 $ 77,035 Undistributed earnings allocated to common shareholders 51,870 57,620 158,970 159,297 Total common shareholders earnings, diluted $ 78,961 $ 83,106 $ 241,711 $ 236,332 Weighted average common shares outstanding 159,126 170,516 161,727 168,249 Effect of dilutive common stock awards 1,256 2,188 1,334 2,101 Effect of dilutive common stock warrants — 98 — 526 Diluted weighted average common shares outstanding 160,382 172,802 163,061 170,876 Basic earnings per common share $ 0.50 $ 0.49 $ 1.49 $ 1.40 Diluted earnings per common share $ 0.49 $ 0.48 $ 1.48 $ 1.38

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 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 nine 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 nine months ended September 30, 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 (498 ) 15.57 Forfeited or expired (114 ) 22.42 Outstanding at September 30, 2019 5,718 $ 20.01 6.43 $ 11,541 Options Exercisable at September 30, 2019 3,535 $ 18.12 5.14 $ 10,901
Summary of restricted stock awards activity (excluding salary shares)	The following table summarizes information about the Corporation’s restricted stock awards activity for the nine months ended September 30, 2019 : Restricted Stock Awards Shares (a) Weighted Average Grant Date Fair Value Outstanding at December 31, 2018 1,993 $ 21.92 Granted 1,172 22.20 Vested (693 ) 20.56 Forfeited (67 ) 23.85 Outstanding at September 30, 2019 2,405 $ 22.39

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2019 were as follows: ($ in Thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) (a) $ 535,977 $ 17,441 $ — $ 553,418 Residential mortgage-related securities FNMA / FHLMC 141,678 1,657 (326 ) 143,009 GNMA 1,075,922 5,983 (1,322 ) 1,080,584 Private-label 749 9 — 758 Commercial mortgage-related securities FNMA / FHLMC 19,996 1,795 — 21,791 GNMA 1,363,848 10,095 (9,996 ) 1,363,948 FFELP asset backed securities 272,871 40 (3,123 ) 269,789 Other debt securities 3,000 — (7 ) 2,993 Total investment securities available for sale $ 3,414,042 $ 37,021 $ (14,774 ) $ 3,436,289 Investment securities held to maturity U. S. Treasury securities $ 999 $ 21 $ — $ 1,019 Obligations of state and political subdivisions (municipal securities) (a) 1,346,234 73,235 (733 ) 1,418,736 Residential mortgage-related securities FNMA / FHLMC 86,140 1,467 (17 ) 87,590 GNMA 295,370 4,832 (94 ) 300,108 GNMA commercial mortgage-related securities 471,675 7,115 (4,959 ) 473,832 Total investment securities held to maturity $ 2,200,419 $ 86,669 $ (5,803 ) $ 2,281,285 (a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale. The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2018 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value 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 September 30, 2019 were as follows: ($ in Thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) (a) $ 535,977 $ 17,441 $ — $ 553,418 Residential mortgage-related securities FNMA / FHLMC 141,678 1,657 (326 ) 143,009 GNMA 1,075,922 5,983 (1,322 ) 1,080,584 Private-label 749 9 — 758 Commercial mortgage-related securities FNMA / FHLMC 19,996 1,795 — 21,791 GNMA 1,363,848 10,095 (9,996 ) 1,363,948 FFELP asset backed securities 272,871 40 (3,123 ) 269,789 Other debt securities 3,000 — (7 ) 2,993 Total investment securities available for sale $ 3,414,042 $ 37,021 $ (14,774 ) $ 3,436,289 Investment securities held to maturity U. S. Treasury securities $ 999 $ 21 $ — $ 1,019 Obligations of state and political subdivisions (municipal securities) (a) 1,346,234 73,235 (733 ) 1,418,736 Residential mortgage-related securities FNMA / FHLMC 86,140 1,467 (17 ) 87,590 GNMA 295,370 4,832 (94 ) 300,108 GNMA commercial mortgage-related securities 471,675 7,115 (4,959 ) 473,832 Total investment securities held to maturity $ 2,200,419 $ 86,669 $ (5,803 ) $ 2,281,285 (a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale. The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2018 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value 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 September 30, 2019 are shown below: Available for Sale Held to Maturity ($ in Thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 3,045 $ 3,049 $ 29,063 $ 29,208 Due after one year through five years 24,894 25,227 91,045 92,075 Due after five years through ten years 295,533 304,383 128,365 132,716 Due after ten years 215,505 223,752 1,098,760 1,165,757 Total debt securities 538,977 556,411 1,347,233 1,419,755 Residential mortgage-related securities FNMA / FHLMC 141,678 143,009 86,140 87,590 GNMA 1,075,922 1,080,584 295,370 300,108 Private-label 749 758 — — Commercial mortgage-related securities FNMA / FHLMC 19,996 21,791 — — GNMA 1,363,848 1,363,948 471,675 473,832 FFELP asset backed securities 272,871 269,789 — — Total investment securities $ 3,414,042 $ 3,436,289 $ 2,200,419 $ 2,281,285 Ratio of fair value to amortized cost 100.7 % 103.7 %
Realized gains and losses and proceeds from sale	The proceeds from the sale and write-up of investment securities for the nine months ended September 30, 2019 and 2018 are shown below: Nine Months Ended September 30, ($ in Thousands) 2019 2018 Gross gains on available for sale securities $ 6,347 $ 1,954 Gross gains on held to maturity securities — — Total gains 6,347 1,954 Gross (losses) on available for sale securities (13,861 ) (3,938 ) Gross (losses) on held to maturity securities — — Total (losses) (13,861 ) (3,938 ) Write-up of equity securities without readily determinable fair values 13,444 — Investment securities gains (losses), net $ 5,931 $ (1,985 ) Proceeds from sales of investment securities $ 1,367,450 $ 601,130
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 September 30, 2019 : Less than 12 months 12 months or more Total ($ in Thousands) Number of Securities Unrealized (Losses) Fair Value Number of Securities Unrealized (Losses) Fair Value Unrealized (Losses) Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) 1 $ — $ 348 — $ — $ — $ — $ 348 Residential mortgage-related securities FNMA / FHLMC 6 (38 ) 21,554 10 (289 ) 65,798 (326 ) 87,352 GNMA 4 (440 ) 67,563 3 (881 ) 86,930 (1,322 ) 154,493 GNMA commercial mortgage-related securities 15 (420 ) 179,281 44 (9,576 ) 653,148 (9,996 ) 832,429 FFELP asset backed securities 18 (2,853 ) 241,852 2 (270 ) 13,213 (3,123 ) 255,065 Other debt securities 3 (7 ) 2,993 — — — (7 ) 2,993 Total 47 $ (3,758 ) $ 513,592 59 $ (11,016 ) $ 819,089 $ (14,774 ) $ 1,332,681 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 25 $ (705 ) $ 34,087 10 $ (28 ) $ 3,846 $ (733 ) $ 37,934 Residential mortgage-related securities FNMA / FHLMC 3 (8 ) 3,674 1 (9 ) 840 (17 ) 4,514 GNMA 1 (25 ) 6,490 8 (69 ) 6,938 (94 ) 13,429 GNMA commercial mortgage-related securities 2 (56 ) 29,467 21 (4,903 ) 390,602 (4,959 ) 420,069 Total 31 $ (794 ) $ 73,718 40 $ (5,009 ) $ 402,227 $ (5,803 ) $ 475,945 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 ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair 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 Loans (Tables)

Loans Loans (Tables)	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Loan composition	The period end loan composition was as follows: ($ in Thousands) September 30, 2019 December 31, 2018 Commercial and industrial $ 7,495,623 $ 7,398,044 Commercial real estate — owner occupied 915,524 920,443 Commercial and business lending 8,411,147 8,318,487 Commercial real estate — investor 3,803,277 3,751,554 Real estate construction 1,356,508 1,335,031 Commercial real estate lending 5,159,784 5,086,585 Total commercial 13,570,932 13,405,072 Residential mortgage 7,954,801 8,277,712 Home equity 879,642 894,473 Other consumer 349,335 363,171 Total consumer 9,183,778 9,535,357 Total loans (a)(b) $ 22,754,710 $ 22,940,429 (a) During the third quarter of 2019, the Corporation sold approximately $240 million of portfolio mortgages as well as $33 million of nonaccrual and performing restructured loans. (b) Includes $2 million and $5 million of purchased credit-impaired loans at September 30, 2019 and December 31, 2018 , respectively.
Commercial and consumer loans by credit quality indicator	The following table presents commercial and consumer loans by credit quality indicator at September 30, 2019 : ($ in Thousands) Pass Special Mention Potential Problem Nonaccrual Total Commercial and industrial $ 7,293,226 $ 86,434 $ 59,427 $ 56,536 $ 7,495,623 Commercial real estate - owner occupied 866,287 26,546 22,624 68 915,524 Commercial and business lending 8,159,513 112,980 82,051 56,604 8,411,147 Commercial real estate - investor 3,634,780 114,343 49,353 4,800 3,803,277 Real estate construction 1,332,930 22,492 544 542 1,356,508 Commercial real estate lending 4,967,710 136,835 49,897 5,342 5,159,784 Total commercial 13,127,223 249,815 131,948 61,946 13,570,932 Residential mortgage 7,896,073 430 1,242 57,056 7,954,801 Home equity 868,854 961 — 9,828 879,642 Other consumer 348,498 728 — 109 349,335 Total consumer 9,113,424 2,119 1,242 66,993 9,183,778 Total loans (a) $ 22,240,647 $ 251,934 $ 133,189 $ 128,939 $ 22,754,710 (a) During the third quarter of 2019, the Corporation sold approximately $240 million of portfolio mortgages. In addition, the Corporation sold $33 million of residential mortgages and home equity loans, of which $21 million were pass loans and $12 million were nonaccrual loans. The following table presents commercial and consumer loans by credit quality indicator at December 31, 2018 : ($ in Thousands) Pass Special Mention Potential Problem Nonaccrual Total 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 September 30, 2019 : Accruing ($ in Thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total Commercial and industrial $ 7,438,395 $ 220 $ 206 $ 266 $ 56,536 $ 7,495,623 Commercial real estate - owner occupied 912,810 2,646 — — 68 915,524 Commercial and business lending 8,351,205 2,867 206 266 56,604 8,411,147 Commercial real estate - investor 3,797,840 — 636 — 4,800 3,803,277 Real estate construction 1,355,371 571 24 — 542 1,356,508 Commercial real estate lending 5,153,211 571 661 — 5,342 5,159,784 Total commercial 13,504,416 3,438 866 266 61,946 13,570,932 Residential mortgage 7,889,681 7,866 197 — 57,056 7,954,801 Home equity 865,017 3,837 961 — 9,828 879,642 Other consumer 345,303 1,321 881 1,720 109 349,335 Total consumer 9,100,001 13,025 2,038 1,720 66,993 9,183,778 Total loans (b) $ 22,604,417 $ 16,462 $ 2,905 $ 1,986 $ 128,939 $ 22,754,710 (a) Of the total nonaccrual loans, $47 million , or 36% , were current with respect to payment at September 30, 2019 . (b)During the third quarter of 2019, the Corporation sold approximately $240 million of portfolio mortgages. In addition, the Corporation sold $33 million of residential mortgages and home equity loans, of which $21 million were accruing current loans, $12 million were nonaccrual loans, and approximately $200,000 were 30-89 days past due accruing loans. The following table presents loans by past due status at December 31, 2018 : Accruing ($ in Thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Nonaccrual (a) Total 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 $2 million of purchased credit-impaired loans, at September 30, 2019 : ($ in Thousands) Recorded Unpaid Related Average Interest Loans with a related allowance Commercial and industrial $ 48,597 $ 59,132 $ 17,791 $ 45,439 $ 1,003 Commercial real estate — owner occupied 1,912 1,919 19 1,988 78 Commercial and business lending 50,510 61,051 17,811 47,427 1,081 Commercial real estate — investor 1,400 2,575 101 780 21 Real estate construction 409 490 56 419 21 Commercial real estate lending 1,809 3,066 157 1,199 42 Total commercial 52,319 64,116 17,968 48,626 1,123 Residential mortgage 24,621 25,783 3,824 27,173 623 Home equity 3,604 4,011 1,313 6,796 136 Other consumer 1,244 1,246 187 1,246 1 Total consumer 29,468 31,041 5,323 35,214 760 Total loans with a related allowance $ 81,787 $ 95,157 $ 23,291 $ 83,840 $ 1,883 Loans with no related allowance Commercial and industrial $ 21,971 $ 59,697 $ — $ 14,448 $ — Commercial real estate — owner occupied — — — — — Commercial and business lending 21,971 59,697 — 14,448 — Commercial real estate — investor 3,705 3,705 — 637 159 Real estate construction — — — — — Commercial real estate lending 3,705 3,705 — 637 159 Total commercial 25,675 63,402 — 15,086 159 Residential mortgage 11,418 11,732 — 8,732 279 Home equity 1,044 1,063 — 1,017 18 Other consumer — — — — — Total consumer 12,462 12,795 — 9,749 297 Total loans with no related allowance $ 38,138 $ 76,197 $ — $ 24,835 $ 456 Total Commercial and industrial $ 70,568 $ 118,829 $ 17,791 $ 59,887 $ 1,003 Commercial real estate — owner occupied 1,912 1,919 19 1,988 78 Commercial and business lending 72,480 120,748 17,811 61,875 1,081 Commercial real estate — investor 5,104 6,280 101 1,417 180 Real estate construction 409 490 56 419 21 Commercial real estate lending 5,514 6,770 157 1,836 201 Total commercial 77,994 127,518 17,968 63,712 1,282 Residential mortgage 36,039 37,515 3,824 35,905 902 Home equity 4,648 5,075 1,313 7,812 154 Other consumer 1,244 1,246 187 1,246 1 Total consumer 41,931 43,836 5,323 44,964 1,056 Total loans (a) $ 119,925 $ 171,354 $ 23,291 $ 108,675 $ 2,338 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 56% of the unpaid principal balance at September 30, 2019 . The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $5 million of purchased credit-impaired loans, at December 31, 2018 : ($ in Thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized 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 with a related allowance $ 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 with no related allowance $ 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: September 30, 2019 December 31, 2018 ($ in Thousands) Performing Restructured Loans Nonaccrual Restructured Loans (a) Performing Restructured Loans Nonaccrual Restructured Loans (a) Commercial and industrial $ 15,398 $ — $ 25,478 $ 249 Commercial real estate — owner occupied 1,912 — 2,080 — Commercial real estate — investor 304 461 799 933 Real estate construction 227 182 311 198 Residential mortgage 3,228 14,090 16,036 22,279 Home equity 2,017 1,559 7,385 2,627 Other consumer 1,243 1 1,174 6 Total restructured loans (b) $ 24,329 $ 16,293 $ 53,263 $ 26,292 (a) Nonaccrual restructured loans have been included within nonaccrual loans. (b) During the third quarter of 2019, the Corporation sold $21 million of performing restructured loans, of which $18 million were residential mortgages and $3 million were home equity loans. In addition, the Corporation sold $7 million of nonaccrual restructured residential mortgage loans.
Summary of restructured loans	The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio, the recorded investment and unpaid principal balance for the nine months ended September 30, 2019 and 2018 : Nine Months Ended September 30, 2019 Nine Months Ended September 30, 2018 ($ in Thousands) Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) Number of Loans Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 1 $ 185 $ 185 6 $ 1,954 $ 1,995 Commercial real estate — investor — — — 1 958 1,022 Residential mortgage 47 6,785 6,863 29 5,655 5,733 Home equity 18 520 520 32 1,552 1,582 Other consumer 1 9 9 3 19 21 Total loans modified 67 $ 7,500 $ 7,577 71 $ 10,138 $ 10,353 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-modification outstanding recorded investment.
Troubled debt restructurings subsequent redefault	The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the nine months ended September 30, 2019 and 2018 and the recorded investment in these restructured loans as of September 30, 2019 and 2018 : Nine Months Ended September 30, 2019 Nine Months Ended September 30, 2018 ($ in Thousands) Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial and industrial — $ — 3 $ — Commercial real estate — investor 1 461 — — Residential mortgage 27 4,528 12 2,579 Home equity 19 538 28 1,599 Total loans modified 47 $ 5,526 43 $ 4,178
Changes in the allowance for loan losses by portfolio segment	The following table provides a summary of the changes in allowance for loan losses in the Corporation's oil and gas loan portfolio at September 30, 2019 and December 31, 2018 : ($ in Millions) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Balance at beginning of period $ 12 $ 27 Charge offs (39 ) (24 ) Recoveries 5 6 Net Charge offs (34 ) (17 ) Provision for loan losses 44 2 Balance at end of period $ 21 $ 12 Allowance for loan losses Individually evaluated for impairment $ 11 $ — Collectively evaluated for impairment 10 12 Total allowance for loan losses $ 21 $ 12 Loans Individually evaluated for impairment $ 36 $ 22 Collectively evaluated for impairment 545 725 Total loans $ 582 $ 747 The following table presents a summary of the changes in the allowance for loan losses by portfolio segment for the nine months ended September 30, 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 (49,845 ) (222 ) — (60 ) (1,754 ) (1,605 ) (4,074 ) (57,560 ) Recoveries 10,322 2,795 31 230 539 1,878 667 16,462 Net Charge offs (39,523 ) 2,573 31 170 (1,215 ) 273 (3,407 ) (41,098 ) Provision for loan losses 36,419 (3,229 ) (971 ) (4,960 ) (5,757 ) (7,690 ) 3,688 17,500 September 30, 2019 $ 105,730 $ 8,599 $ 39,904 $ 23,451 $ 18,623 $ 11,849 $ 6,269 $ 214,425 Allowance for loan losses Individually evaluated for impairment $ 17,791 $ 19 $ 101 $ 56 $ 3,824 $ 1,313 $ 187 $ 23,291 Collectively evaluated for impairment 87,939 8,579 39,803 23,395 14,799 10,536 6,082 191,133 Total allowance for loan losses $ 105,730 $ 8,599 $ 39,904 $ 23,451 $ 18,623 $ 11,849 $ 6,269 $ 214,425 Loans Individually evaluated for impairment $ 70,568 $ 1,912 $ 5,104 $ 409 $ 36,039 $ 4,648 $ 1,244 $ 119,925 Collectively evaluated for impairment 7,424,690 912,935 3,798,039 1,356,088 7,918,265 874,968 348,091 22,633,075 Acquired and accounted for under ASC 310-30 (a) 365 677 134 11 497 26 — 1,710 Total loans $ 7,495,623 $ 915,524 $ 3,803,277 $ 1,356,508 $ 7,954,801 $ 879,642 $ 349,335 $ 22,754,710 (a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality." For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2018 , was as follows: ($ in Thousands) Commercial and Commercial real estate - owner occupied 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 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."
Changes in the allowance for unfunded commitments	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 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 70 2,436 Balance at end of period $ 22,907 $ 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 nine months ended September 30, 2019 and for the year ended December 31, 2018 : ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Changes in Accretable Yield Balance at beginning of period $ 1,482 $ — Purchases — 4,853 Accretion (912 ) (4,954 ) Net reclassification from non-accretable yield 23 1,605 Other (a) — (22 ) Balance at end of period $ 595 $ 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."

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 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: ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Core deposit intangibles Gross carrying amount $ 80,730 $ 58,100 Accumulated amortization (10,438 ) (5,326 ) Net book value $ 70,292 $ 52,774 Additions during the period $ 22,630 $ 58,100 Amortization during the year $ 5,112 $ 5,326 Other intangibles Gross carrying amount $ 44,887 $ 44,931 Reductions due to sale (140 ) (43 ) Accumulated amortization (23,950 ) (21,825 ) Net book value $ 20,797 $ 23,062 Additions during the period $ — $ 10,359 Amortization during the year $ 2,125 $ 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 MSR asset and the MSR valuation allowance is as follows: ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 68,433 $ 59,168 Additions from acquisition — 8,136 Additions 8,900 10,722 Amortization (8,749 ) (9,594 ) Mortgage servicing rights at end of period $ 68,584 $ 68,433 Valuation allowance at beginning of period $ (239 ) $ (784 ) (Additions) recoveries, net (177 ) 545 Valuation allowance at end of period $ (416 ) $ (239 ) Mortgage servicing rights, net $ 68,168 $ 68,193 Fair value of mortgage servicing rights $ 70,241 $ 81,012 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 8,688,012 $ 8,600,983 Mortgage servicing rights, net to servicing portfolio 0.78 % 0.79 % Mortgage servicing rights expense (a) $ 8,926 $ 9,049
Summary of estimated future amortization expense	The following table shows the estimated future amortization expense for amortizing intangible assets: ($ in Thousands) Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights Three Months Ending December 31, 2019 $ 2,018 $ 693 $ 3,234 2020 8,073 2,690 12,262 2021 8,073 2,666 10,074 2022 8,073 2,642 8,259 2023 8,073 2,623 6,777 2024 8,073 2,603 5,574 Beyond 2024 27,909 6,879 22,403 Total Estimated Amortization Expense $ 70,292 $ 20,797 $ 68,584

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	9 Months Ended
	Sep. 30, 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): ($ in Thousands) September 30, 2019 December 31, 2018 Short-Term Funding Federal funds purchased $ 75 $ 19,710 Securities sold under agreements to repurchase 77,953 91,941 Federal funds purchased and securities sold under agreements to repurchase 78,028 111,651 Commercial paper 30,416 45,423 Total short-term funding $ 108,444 $ 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 (3,201 ) (4,389 ) Total long-term funding 796,799 795,611 Total short and long-term funding, excluding FHLB advances $ 905,243 $ 952,685 FHLB Advances Short-term FHLB advances $ 215,000 $ 900,000 Long-term FHLB advances 2,662,727 2,674,371 Total FHLB advances $ 2,877,727 $ 3,574,371 Total short and long-term funding $ 3,782,970 $ 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 September 30, 2019 and December 31, 2018 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total September 30, 2019 Repurchase agreements Agency mortgage-related securities $ 77,953 $ — $ — $ — $ 77,953 Total $ 77,953 $ — $ — $ — $ 77,953 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 September 30, 2019 and December 31, 2018 are presented in the following table: September 30, 2019 December 31, 2018 ($ in Thousands) Amount Weighted Average Contractual Coupon Rate Amount Weighted Average Contractual Coupon Rate Maturity or put date 1 year or less $ 2,376,052 2.24 % $ 2,262,584 2.06 % After 1 but within 2 288,174 2.57 % 1,285,039 2.39 % After 2 but within 3 5,781 5.11 % 14,393 2.98 % After 3 years 207,720 2.30 % 12,354 4.55 % FHLB advances and overall rate $ 2,877,727 2.28 % $ 3,574,371 2.19 %

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other derivative instruments not designated as hedging instruments	The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of September 30, 2019 and December 31, 2018 . The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of September 30, 2019 and December 31, 2018 . The resulting net derivative asset and liability fair values are included in other assets and accrued expenses and other liabilities, respectively, on the consolidated balance sheets. September 30, 2019 December 31, 2018 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Designated as hedging instruments Interest rate-related instruments $ 500,000 $ 114 $ — $ — $ — $ — $ 500,000 $ 40 Not designated as hedging instruments Interest rate-related instruments 2,799,863 100,376 2,799,863 17,586 2,707,204 52,796 2,707,204 52,653 Foreign currency exchange forwards 211,475 3,153 184,476 2,823 117,879 721 69,153 675 Commodity contracts 259,210 25,388 258,483 24,758 331,727 35,426 315,861 34,340 Mortgage banking (a) 300,515 2,017 227,060 590 191,222 2,208 139,984 2,072 Time deposits 518 13 518 13 11,185 109 11,185 109 Total not designated as hedging instruments 130,947 45,770 91,260 89,849 Gross derivatives before netting 131,061 45,770 91,260 89,889 Less: Legally enforceable master netting agreements 4,629 4,629 5,322 5,322 Less: Cash collateral pledged/received 16,182 14,680 27,593 63 Total derivative instruments, after netting (b) $ 110,250 $ 26,461 $ 58,345 $ 84,504 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. (b) The fair values of derivative assets are included in other assets, while the fair values of derivative liabilities are included in accrued expenses and other liabilities, in the consolidated balance sheets.
Cumulative basis adjustment for fair value hedges	The following table presents amounts that were recorded on the consolidated balance sheets related to cumulative basis adjustments for fair value hedges: Line Item in the Consolidated Balance Sheets 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) September 30, 2019 Loans and investment securities receivables (a) $ 506,111 $ 6,111 Total $ 506,111 $ 6,111 (a) These amounts include the amortized cost basis of closed portfolios used in designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At September 30, 2019 , the amortized cost basis of the closed portfolios used in these hedging relationships was $947 million ; the positive cumulative basis adjustments associated with these hedging relationships was $6 million; and the amounts of the designated hedged items were $500 million .
Schedule of cash flow hedging instruments, statements of financial performance and financial position location	The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2019 and 2018 : Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 ($ in Thousands) Interest Income Other Income (Expense) Interest Income Other Income (Expense) 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 the fair value hedge is recorded $ (59 ) $ — $ (17 ) $ — $ 160 $ — $ (30 ) $ — The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items 452 — (2,522 ) — 6,674 — (4,931 ) — Derivatives designated as hedging instruments (a) (511 ) — 2,506 — (6,514 ) — 4,902 — (a) Includes net settlements on the derivatives.
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 for the three and nine months ended September 30, 2019 and 2018 : Consolidated Statements of Income Category of Gain / (Loss) Recognized in Income Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ (619 ) $ 246 $ (2,309 ) $ 354 Foreign currency exchange forwards Capital markets, net 72 (92 ) 284 (22 ) Commodity contracts Capital markets, net 208 (72 ) (456 ) (958 ) Interest rate lock commitments (mortgage) Mortgage banking, net (2,851 ) (1,602 ) (191 ) 147 Forward commitments (mortgage) Mortgage banking, net 1,313 2,271 1,482 1,665

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 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, commodity and foreign exchange 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 Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Liabilities Offset Cash Collateral Received Net amount Derivative assets (a) September 30, 2019 $ 24,930 $ (4,629 ) $ (16,182 ) $ 4,118 $ — $ 4,118 December 31, 2018 65,596 (5,322 ) (27,593 ) 32,681 (31,837 ) 843 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Assets Offset Cash Collateral Pledged Net amount Derivative liabilities (a) September 30, 2019 $ 19,537 $ (4,629 ) $ (14,680 ) $ 228 $ — $ 228 December 31, 2018 22,951 (5,322 ) (63 ) 17,567 (17,551 ) 16 (a) Includes interest, commodity, and foreign exchange agreements

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: ($ in Thousands) September 30, 2019 December 31, 2018 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 8,909,815 $ 8,720,293 Commercial letters of credit (a) 8,119 7,599 Standby letters of credit (c) 272,376 255,904 (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 was not material at September 30, 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 $3 million and $2 million at September 30, 2019 and December 31, 2018 , respectively, as an estimate of the fair value of these financial instruments.
Summary of changes in the residential mortgage repurchase reserve	The following summarizes the changes in the mortgage repurchase reserve for the nine months ended September 30, 2019 and for the year ended December 31, 2018 : ($ in Thousands) Nine Months Ended September 30, 2019 Year Ended December 31, 2018 Balance at beginning of period $ 752 $ 987 Repurchase provision expense 309 345 Adjustments to provision expense — (450 ) Repurchase/reimbursement charges taken (299 ) (218 ) Amount recorded at acquisition — 88 Balance at end of period $ 762 $ 752

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2019 and December 31, 2018 , aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy September 30, 2019 December 31, 2018 Assets Investment securities available for sale U.S. Treasury securities Level 1 $ — $ 999 Obligations of state and political subdivisions (municipal securities) Level 2 553,418 — Residential mortgage-related securities FNMA / FHLMC Level 2 143,009 295,252 GNMA Level 2 1,080,584 2,128,531 Private-label Level 2 758 1,003 Commercial mortgage-related securities FNMA / FHLMC Level 2 21,791 — GNMA Level 2 1,363,948 1,220,797 FFELP asset backed securities Level 2 269,789 297,360 Other debt securities Level 2 2,993 3,000 Total investment securities available for sale Level 1 $ — $ 999 Total investment securities available for sale Level 2 $ 3,436,289 $ 3,945,943 Equity securities with readily determinable fair values Level 1 1,652 1,568 Residential loans held for sale Level 2 137,655 64,321 Interest rate-related instruments (a) Level 2 100,376 52,796 Foreign currency exchange forwards (a) Level 2 3,153 721 Commodity contracts (a) Level 2 25,388 35,426 Purchased options (time deposit) Level 2 13 109 Interest rate products (designated as hedging instruments) Level 2 114 — Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 2,017 2,208 Liabilities Interest rate-related instruments (a) Level 2 $ 17,586 $ 52,653 Foreign currency exchange forwards (a) Level 2 2,823 675 Commodity contracts (a) Level 2 24,758 34,340 Written options (time deposit) Level 2 13 109 Interest rate products (designated as hedging instruments) Level 2 — 40 Forward commitments to sell residential mortgage loans Level 3 590 2,072
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 nine months ended September 30, 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: ($ in Thousands) Derivative Financial Instruments 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) 1,292 Balance September 30, 2019 $ 1,428
Equity securities without readily determinable fair value	The following table presents the carrying value of equity securities without readily determinable fair values still held as of September 30, 2019 that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of September 30, 2019 : ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2018 $ — Upward carrying value changes 13,444 Carrying value as of September 30, 2019 $ 13,444 Cumulative upward carrying value changes between January 1, 2018 and September 30, 2019 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2019 $ —
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 September 30, 2019 Assets Impaired loans (a) Level 3 $ 51,501 Provision for credit losses (b) $ (60,627 ) OREO (c) Level 2 2,413 Other noninterest expense (1,453 ) Mortgage servicing rights Level 3 70,241 Mortgage banking, net (177 ) Equity securities Level 3 13,444 Investment securities gains (losses), net 13,444 December 31, 2018 Assets Impaired loans (a) Level 3 $ 26,191 Provision for credit losses (b) $ (14,521 ) OREO (c) Level 2 2,200 Other noninterest expense (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 September 30, 2019 Mortgage servicing rights Discounted cash flow Discount rate 9% Mortgage servicing rights Discounted cash flow Constant prepayment rate 13% Impaired Loans Appraisals / Discounted cash flow Collateral / Discount factor 48%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: September 30, 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 $ 523,435 $ 523,435 $ 507,187 $ 507,187 Interest-bearing deposits in other financial institutions Level 1 236,010 236,010 221,226 221,226 Federal funds sold and securities purchased under agreements to resell Level 1 100 100 148,285 148,285 Investment securities held to maturity Level 1 999 1,019 — — Investment securities held to maturity Level 2 2,199,420 2,280,265 2,740,511 2,710,271 Investment securities available for sale Level 1 — — 999 999 Investment securities available for sale Level 2 3,436,289 3,436,289 3,945,943 3,945,943 Equity securities with readily determinable fair values Level 1 1,652 1,652 1,568 1,568 Equity securities without readily determinable fair values Level 3 13,444 13,444 — — FHLB and Federal Reserve Bank stocks Level 2 207,443 207,443 250,534 250,534 Residential loans held for sale Level 2 137,655 137,655 64,321 64,321 Commercial loans held for sale Level 2 11,597 11,597 14,943 14,943 Loans, net Level 3 22,540,285 22,422,568 22,702,406 22,317,395 Bank and corporate owned life insurance Level 2 670,739 670,739 663,203 663,203 Derivatives (other assets) (a) Level 2 129,044 129,044 89,052 89,052 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 2,017 2,017 2,208 2,208 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 21,512,804 $ 21,512,804 $ 22,081,992 $ 22,081,992 Brokered CDs and other time deposits (b) Level 2 2,909,759 2,910,112 2,815,401 2,815,401 Short-term funding (c) Level 2 108,444 108,444 157,074 157,074 Long-term funding Level 2 796,799 842,196 795,611 826,612 FHLB advances Level 2 2,877,727 2,938,923 3,574,371 3,565,572 Standby letters of credit (d) Level 2 2,715 2,715 2,482 2,482 Derivatives (accrued expenses and other liabilities) (a) Level 2 45,180 45,180 87,817 87,817 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 590 590 2,072 2,072 (a) Figures are presented gross before netting. See Note 10 Derivative and Hedging Activities and Note 11 Balance Sheet Offsetting for information relating to the impact of netting derivative assets and derivative liabilities as well as the impact from offsetting cash collateral paid to the same derivative counterparty where there is a legally enforceable master netting agreement in place. (b) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (c) The carrying amount is a reasonable estimate of fair value for existing short-term funding. (d) The commitment on standby letters of credit was $272 million at September 30, 2019 and $256 million at December 31, 2018 . See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2019 and 2018 were as follows: Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Components of Net Periodic Benefit Cost RAP Service cost $ 1,598 $ 1,885 $ 5,448 $ 5,670 Interest cost 2,489 1,682 7,314 5,002 Expected return on plan assets (6,099 ) (4,777 ) (18,249 ) (14,287 ) Amortization of prior service cost (18 ) (18 ) (55 ) (56 ) Amortization of actuarial loss 230 549 360 1,474 Total net periodic pension cost $ (1,800 ) $ (680 ) $ (5,183 ) $ (2,197 ) Bank Mutual Pension Plan Interest cost N/A $ 654 N/A $ 1,737 Expected return on plan assets N/A (1,220 ) N/A (2,812 ) Total net periodic pension cost N/A $ (566 ) N/A $ (1,075 ) Postretirement Plan Interest cost $ 26 $ 27 $ 78 $ 80 Amortization of prior service cost (19 ) (19 ) (56 ) (56 ) Amortization of actuarial loss (1 ) 2 (3 ) 6 Total net periodic benefit cost $ 6 $ 11 $ 19 $ 30

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 110,929 $ 113,298 $ 342,486 $ 339,718 Net intersegment interest income (expense) (17,318 ) (13,018 ) (60,000 ) (36,151 ) Segment net interest income 93,612 100,280 282,485 303,567 Noninterest income 13,452 12,280 39,215 39,156 Total revenue 107,063 112,560 321,700 342,723 Credit provision 12,912 11,232 39,713 32,955 Noninterest expense 39,172 41,828 117,982 122,853 Income (loss) before income taxes 54,979 59,500 164,005 186,914 Income tax expense (benefit) 9,670 12,098 30,536 36,978 Net income $ 45,309 $ 47,402 $ 133,469 $ 149,937 Allocated goodwill $ 525,836 $ 524,525 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 81,517 $ 91,323 $ 254,463 $ 268,137 Net intersegment interest income (expense) 27,651 21,951 76,679 63,301 Segment net interest income 109,167 113,275 331,142 331,438 Noninterest income 81,133 73,838 233,692 224,124 Total revenue 190,300 187,113 564,834 555,562 Credit provision 5,008 5,280 15,007 15,125 Noninterest expense 137,761 139,627 406,984 405,129 Income (loss) before income taxes 47,532 42,206 142,843 135,307 Income tax expense (benefit) 9,982 8,863 30,003 28,415 Net income $ 37,550 $ 33,343 $ 112,839 $ 106,893 Allocated goodwill $ 650,394 $ 644,397 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 13,919 $ 14,770 $ 38,583 $ 47,770 Net intersegment interest income (expense) (10,333 ) (8,933 ) (16,679 ) (27,150 ) Segment net interest income 3,586 5,837 21,905 20,620 Noninterest income 6,265 2,183 14,983 8,242 Total revenue 9,852 8,019 36,888 28,861 Credit provision (15,919 ) (21,512 ) (38,721 ) (49,081 ) Noninterest expense (a) 23,981 22,959 65,399 100,654 Income (loss) before income taxes 1,790 6,572 10,209 (22,712 ) Income tax expense (benefit) 1,295 1,388 1,816 (10,460 ) Net income $ 495 $ 5,185 $ 8,393 $ (12,252 ) Allocated goodwill $ — $ — Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Net interest income $ 206,365 $ 219,392 $ 635,532 $ 655,625 Net intersegment interest income (expense) — — — — Segment net interest income 206,365 219,392 635,532 655,625 Noninterest income 100,850 88,300 287,890 271,522 Total revenue 307,216 307,692 923,422 927,146 Credit provision 2,000 (5,000 ) 16,000 (1,000 ) Noninterest expense 200,930 204,413 590,380 628,636 Income (loss) before income taxes 104,286 108,279 317,042 299,510 Income tax expense (benefit) 20,947 22,349 62,356 54,932 Net income $ 83,339 $ 85,929 $ 254,686 $ 244,578 Allocated goodwill $ 1,176,230 $ 1,168,922 (a) For the three months ended both September 30, 2019 and 2018 , the Risk Management and Shared Services segment included approximately $2 million of acquisition related noninterest expense. For the nine months ended September 30, 2019 and 2018 , the Risk Management and Shared Services segment included approximately $6 million and $30 million , respectively, of acquisition related noninterest expense.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2019 and 2018 , including changes during the preceding nine and three month periods as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Securities Available For Sale Defined Benefit Pension and Post Retirement Obligations Accumulated Other Comprehensive Income (Loss) Balance January 1, 2019 $ (75,643 ) $ (49,330 ) $ (124,972 ) Other comprehensive income (loss) before reclassifications 123,139 — 123,139 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (5,931 ) — (5,931 ) Personnel expense — (111 ) (111 ) Other expense — 357 357 Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities 279 — 279 Income tax (expense) benefit (29,651 ) (62 ) (29,713 ) Net other comprehensive income (loss) during period 87,836 184 88,020 Balance September 30, 2019 $ 12,194 $ (49,146 ) $ (36,953 ) Balance January 1, 2018 $ (38,453 ) $ (24,305 ) $ (62,758 ) Other comprehensive income (loss) before reclassifications (82,099 ) — (82,099 ) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities loss (gain), net 1,985 — 1,985 Personnel expense — (112 ) (112 ) Other expense — 1,480 1,480 Adjustment for adoption of ASU 2016-01 (84 ) — (84 ) Adjustment for adoption of ASU 2018-02 (8,419 ) (5,235 ) (13,654 ) Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (684 ) — (684 ) Income tax (expense) benefit 20,796 (390 ) 20,406 Net other comprehensive income (loss) during period (68,505 ) (4,257 ) (72,762 ) Balance September 30, 2018 $ (106,958 ) $ (28,562 ) $ (135,520 ) ($ in Thousands) Investments Defined Benefit Accumulated Balance July 1, 2019 $ (9,773 ) $ (49,290 ) $ (59,063 ) Other comprehensive income (loss) before reclassifications 33,173 — 33,173 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (3,788 ) — (3,788 ) Personnel expense — (36 ) (36 ) Other expense — 229 229 Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (8 ) — (8 ) Income tax (expense) benefit (7,410 ) (49 ) (7,458 ) Net other comprehensive income (loss) during period 21,967 144 22,111 Balance September 30, 2019 $ 12,194 $ (49,146 ) $ (36,953 ) Balance July 1, 2018 $ (90,986 ) $ (28,902 ) $ (119,888 ) Other comprehensive income (loss) before reclassifications (21,345 ) — (21,345 ) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities loss (gain), net (30 ) — (30 ) Personnel expense — (37 ) (37 ) Other expense — 551 551 Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (52 ) — (52 ) Income tax (expense) benefit 5,456 (174 ) 5,282 Net other comprehensive income (loss) during period (15,971 ) 340 (15,631 ) Balance September 30, 2018 $ (106,958 ) $ (28,562 ) $ (135,520 )

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 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 September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Service charges and deposit account fees $ 3,182 $ 3,669 $ 9,765 $ 11,680 Card-based fees (a) 336 353 1,001 1,014 Other revenue 809 88 (475 ) (69 ) Noninterest Income (in-scope of Topic 606) $ 4,326 $ 4,109 $ 10,291 $ 12,625 Noninterest Income (out-of-scope of Topic 606) 9,125 8,171 28,924 26,531 Total Noninterest Income $ 13,452 $ 12,280 $ 39,215 $ 39,156 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Insurance commissions and fees $ 21,041 $ 21,677 $ 69,483 $ 68,289 Wealth management fees (b) 21,015 21,224 61,885 61,932 Service charges and deposit account fees 13,367 13,210 37,293 37,984 Card-based fees (a) 10,120 9,489 28,829 28,449 Other revenue 2,803 2,918 8,175 8,411 Noninterest Income (in-scope of Topic 606) $ 68,346 $ 68,518 $ 205,666 $ 205,065 Noninterest Income (out-of-scope of Topic 606) 12,787 5,320 28,026 19,059 Total Noninterest Income $ 81,133 $ 73,838 $ 233,692 $ 224,124 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Insurance commissions and fees $ (87 ) $ (41 ) $ (80 ) $ (9 ) Wealth management fees (b) — — — 267 Service charges and deposit account fees 12 25 44 50 Card-based fees (a) 45 (15 ) 143 (9 ) Other revenue 71 122 310 282 Noninterest Income (in-scope of Topic 606) $ 41 $ 91 $ 417 $ 580 Noninterest Income (out-of-scope of Topic 606) 6,224 2,092 14,567 7,662 Total Noninterest Income $ 6,265 $ 2,183 $ 14,983 $ 8,242 Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2019 2018 2019 2018 Insurance commissions and fees $ 20,954 $ 21,636 $ 69,403 $ 68,279 Wealth management fees (b) 21,015 21,224 61,885 62,198 Service charges and deposit account fees 16,561 16,904 47,102 49,714 Card-based fees (a) 10,501 9,826 29,973 29,454 Other revenue 3,683 3,128 8,010 8,624 Noninterest Income (in-scope of Topic 606) $ 72,713 $ 72,718 $ 216,373 $ 218,270 Noninterest Income (out-of-scope of Topic 606) 28,137 15,583 71,517 53,252 Total Noninterest Income $ 100,850 $ 88,300 $ 287,890 $ 271,522 (a) Certain card-based fees are out-of-scope of Topic 606. (b) Includes trust, asset management, brokerage, and annuity fees.
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 consist 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)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lease, Cost and Cash Flows	Operating lease costs and cash flows resulting from operating lease are presented below: ($ in Thousands) Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Operating Lease Costs $ 2,708 $ 8,502 Operating Lease Cash Flows 2,968 8,538
Components of lease expense	The lease classifications on the consolidated balance sheets were as follows: September 30, 2019 ($ in Thousands) Amount Consolidated Balance Sheets Category Operating lease right-of-use asset $ 48,127 Premises and equipment Finance lease right-of-use asset — Other assets Operating lease liability 52,011 Accrued expenses and other liabilities Finance lease liability — Other long-term funding
Operating lease information	The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: September 30, 2019 ($ in Thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment $ 66 1.08 2.72 % Retail and corporate offices 54,202 6.63 3.36 % Land 6,425 12.11 3.34 % Total operating leases $ 60,693 7.40 3.36 %
Amortization of operating lease liabilities	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 Three Months Ending December 31, 2019 $ 4,070 2020 10,520 2021 9,828 2022 7,578 2023 5,450 Beyond 2023 23,248 Total lease payments 60,693 Less: interest 8,682 Present value of lease payments $ 52,011

Acquisitions Huntington Acquisi

Acquisitions Huntington Acquisition (Details) - USD ($) $ in Thousands	Jun. 14, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
June 14, 2019
Goodwill		$ 1,176,230	$ 1,169,023
Total liabilities		$ 725,764		$ 2,340,294
Huntington National Bank
Purchase Accounting Adjustments
Cash and cash equivalents	$ 0
Loans	(1,552)
Premises and equipment, net	4,800
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	22,630
OREO (included in other assets on the face of the consolidated balance sheets)	(2,561)
Other assets	0
Deposits	156
Other liabilities	70
June 14, 2019
Cash and cash equivalents	551,250
Loans	116,346
Premises and equipment, net	22,430
Goodwill	7,286
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	22,630
OREO (included in other assets on the face of the consolidated balance sheets)	5,263
Other assets	559
Total assets	725,764
Deposits	725,173
Other liabilities	590
Total liabilities	$ 725,764

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Millions	Jul. 25, 2019USD ($)branch	Jun. 14, 2019USD ($)branch	Sep. 30, 2019acquisition
Business Acquisition [Line Items]
Number of Businesses Acquired | acquisition			1
Huntington National Bank
Business Acquisition [Line Items]
Business Combination, Control Obtained Description		This all cash transaction closed on June 14, 2019
Effective Date of Acquisition		Jun. 14, 2019
New Communities		13
Acquired Net Branches | branch		14
Goodwill acquired		$ 7
Amortization period		10 years
First Staunton Bancshares [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement	Jul. 25, 2019
Business Acquisition, Name of Acquired Entity	First Staunton
Estimated Consideration Transferred	$ 76
Estimate Acquired Loans	$ 350
Estimate Acquired Net Branches | branch	9
Estimate Acquired Deposits	$ 440

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets			$ 589,420			$ 516,538
Accrued expenses and other liabilities	[1]		470,073			409,787
Transfer of securities from held to maturity to available for sale			692,000
Operating lease right-of-use asset			48,127
Operating lease liability			$ 52,011
Furniture and Fixtures
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life			12 years	7 years
Effect of change on net income			$ 230
Effect of Change | Change in Accounting Policy for Netting Agreements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets						(33,000)
Accrued expenses and other liabilities						$ (33,000)
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset					$ 52,000
Operating lease liability					$ 56,000
Accounting Standards Update 2019-04
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transfer of securities from held to maturity to available for sale			$ 692,000
Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated reduction to tangible common equity		(0.25%)
Reasonable and Supportable Period2016-13 [Text Block]		1 year
Straight Line Reversion to Historical Losses 2016-13 [Text Block]		1 year
Minimum | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percent increase in allowance for credit losses		30.00%
Maximum | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percent increase in allowance for credit losses		40.00%
[1]	(b) During the third quarter of 2019, the Corporation made a change in accounting policy to offset derivative assets and liabilities and cash collateral with the same counterparty where it has a legally enforceable master netting agreement in place. The change had no impact on either earnings or equity. The Corporation believes that this change is a preferable method of accounting as it provides a better reflection of the assets and liabilities on the face of the consolidated balance sheets. Adoption of this change was voluntary and has been adopted retrospectively with all prior periods presented herein revised.

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Calculations for basic and diluted earnings per common share
Net income	$ 83,339	$ 84,661	$ 86,686	$ 85,929	$ 89,192	$ 69,456	$ 254,686	$ 244,578
Preferred stock dividends	(3,801)			(2,409)			(11,402)	(7,077)
Net income available to common equity	79,539			83,521			243,285	237,501
Common shareholder dividends	(27,091)			(25,486)			(82,741)	(77,035)
Unvested share-based payment awards	(198)			(128)			(506)	(396)
Undistributed earnings	52,250			57,907			160,037	160,070
Undistributed earnings allocated to common shareholders	51,870			57,620			158,970	159,297
Undistributed earnings allocated to unvested share-based payment awards	380			288			1,067	772
Undistributed earnings	52,250			57,907			160,037	160,070
Basic
Distributed earnings to common shareholders	27,091			25,486			82,741	77,035
Undistributed earnings allocated to common shareholders	51,870			57,620			158,970	159,297
Total common shareholders earnings, basic	78,961			83,106			241,711	236,332
Diluted
Distributed earnings to common shareholders	27,091			25,486			82,741	77,035
Undistributed earnings allocated to common shareholders	51,870			57,620			158,970	159,297
Total common shareholders earnings, diluted	$ 78,961			$ 83,106			$ 241,711	$ 236,332
Weighted average common shares outstanding	159,126			170,516			161,727	168,249
Effect of dilutive common stock awards	1,256			2,188			1,334	2,101
Effect of dilutive common stock warrants	0			98			0	526
Diluted weighted average common shares outstanding	160,382			172,802			163,061	170,876
Basic earnings per common share	$ 0.50			$ 0.49			$ 1.49	$ 1.40
Diluted earnings per common share	$ 0.49			$ 0.48			$ 1.48	$ 1.38

Earnings Per Common Share (De_2

Earnings Per Common Share (Details Textuals) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 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	3	1

Stock-Based Compensation Fair V

Stock-Based Compensation Fair Value Assumptions of Stock Options (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 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	9 Months Ended	12 Months Ended
	Sep. 30, 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	(498)
Forfeited or expired	(114)
September 30, 2019	5,718	5,281
September 30, 2019	3,535
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
December 31, 2018	$ 19.09
Granted	22.77
Exercised	15.57
Forfeited	22.42
September 30, 2019	20.01	$ 19.09
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 18.12
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 5 months 4 days	6 years 2 months 4 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 1 month 20 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 11,541	$ 12,392
Options exercisable, Aggregate Intrinsic Value	$ 10,901

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
December 31, 2018 | shares	1,993
Granted | shares	1,172
Vested | shares	(693)
Forfeited | shares	(67)
September 30, 2019 | shares	2,405
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	22.20
Vested, Weighted Average Grant Date Fair Value | $ / shares	20.56
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	23.85
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 22.39

Stock-Based Compensation (Detai

Stock-Based Compensation (Details Textuals) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Intrinsic value of stock options exercised	$ 3	$ 10
Total fair value of vested stock options	$ 4	4
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%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting	$ 4	$ 3
Recognized compensation expense for accelerated vesting	1
Unvested share-based payment awards	$ 5
Remaining requisite service periods, extend through	first quarter 2023
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
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
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting	$ 18	$ 10
Recognized compensation expense for accelerated vesting	3
Unvested share-based payment awards	$ 23
Remaining requisite service periods, extend through	first quarter 2023

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands		3 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Investment securities available for sale
Amortized Cost		$ 3,414,042	$ 4,041,902
Gross Unrealized Gains		37,021	3,649
Gross Unrealized (Losses)		(14,774)	(98,610)
Fair Value	[1]	3,436,289	3,946,941
Investment securities held to maturity
Held to Maturity, Amortized Cost	[1]	2,200,419	2,740,511
Held-to-maturity, Gross Unrealized Gains		86,669	17,593
Held-to-maturity, Gross Unrealized Loss		(5,803)	(47,835)
Held-to-maturity, Fair Value		2,281,285	2,710,271
Transfer of securities from held to maturity to available for sale		692,000
Debt Securities, AFS, Principal Sold		157,000
U. S. Treasury securities
Investment securities available for sale
Amortized Cost			1,000
Gross Unrealized Gains			0
Gross Unrealized (Losses)			(1)
Fair Value			999
Investment securities held to maturity
Held to Maturity, Amortized Cost		999
Held-to-maturity, Gross Unrealized Gains		21
Held-to-maturity, Gross Unrealized Loss		0
Held-to-maturity, Fair Value		1,019
Obligations of state and political subdivisions (municipal securities)(a)
Investment securities available for sale
Amortized Cost		535,977
Gross Unrealized Gains		17,441
Gross Unrealized (Losses)		0
Fair Value		553,418
Investment securities held to maturity
Held to Maturity, Amortized Cost		1,346,234	1,790,683
Held-to-maturity, Gross Unrealized Gains		73,235	8,255
Held-to-maturity, Gross Unrealized Loss		(733)	(15,279)
Held-to-maturity, Fair Value		1,418,736	1,783,659
Private-label
Investment securities available for sale
Amortized Cost		749	1,007
Gross Unrealized Gains		9	0
Gross Unrealized (Losses)		0	(4)
Fair Value		758	1,003
Investment securities held to maturity
Held to Maturity, Amortized Cost		0
Held-to-maturity, Fair Value		0
FFELP asset backed securities
Investment securities available for sale
Amortized Cost		272,871	297,347
Gross Unrealized Gains		40	711
Gross Unrealized (Losses)		(3,123)	(698)
Fair Value		269,789	297,360
Investment 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)		(7)	0
Fair Value		2,993	3,000
FNMA / FHLMC | Residential mortgage-related securities
Investment securities available for sale
Amortized Cost		141,678	296,296
Gross Unrealized Gains		1,657	2,466
Gross Unrealized (Losses)		(326)	(3,510)
Fair Value		143,009	295,252
Investment securities held to maturity
Held to Maturity, Amortized Cost		86,140	92,788
Held-to-maturity, Gross Unrealized Gains		1,467	169
Held-to-maturity, Gross Unrealized Loss		(17)	(1,795)
Held-to-maturity, Fair Value		87,590	91,162
FNMA / FHLMC | Commercial mortgage-related securities
Investment securities available for sale
Amortized Cost		19,996
Gross Unrealized Gains		1,795
Gross Unrealized (Losses)		0
Fair Value		21,791
Investment securities held to maturity
Held to Maturity, Amortized Cost		0
Held-to-maturity, Fair Value		0
GNMA | Residential mortgage-related securities
Investment securities available for sale
Amortized Cost		1,075,922	2,169,943
Gross Unrealized Gains		5,983	473
Gross Unrealized (Losses)		(1,322)	(41,885)
Fair Value		1,080,584	2,128,531
Investment securities held to maturity
Held to Maturity, Amortized Cost		295,370	351,606
Held-to-maturity, Gross Unrealized Gains		4,832	1,611
Held-to-maturity, Gross Unrealized Loss		(94)	(8,181)
Held-to-maturity, Fair Value		300,108	345,035
GNMA | Commercial mortgage-related securities
Investment securities available for sale
Amortized Cost		1,363,848	1,273,309
Gross Unrealized Gains		10,095	0
Gross Unrealized (Losses)		(9,996)	(52,512)
Fair Value		1,363,948	1,220,797
Investment securities held to maturity
Held to Maturity, Amortized Cost		471,675	505,434
Held-to-maturity, Gross Unrealized Gains		7,115	7,559
Held-to-maturity, Gross Unrealized Loss		(4,959)	(22,579)
Held-to-maturity, Fair Value		$ 473,832	$ 490,414
[1]	(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Amortized Cost
Available for Sale, Due in one year or less		$ 3,045
Available for Sale, Due after one year through five years		24,894
Available for Sale, Due after five years through ten years		295,533
Available for Sale, Due after ten years		215,505
Available for Sale, Total debt securities		538,977
Available for Sale, amortized cost		3,414,042	$ 4,041,902
Fair Value
Available for Sale, Due in one year or less		3,049
Available for Sale, Due after one year through five years		25,227
Available for Sale, Due after five years through ten years		304,383
Available for Sale, Due after ten years		223,752
Available for Sale, Total debt securities		556,411
Investment securities available for sale, at fair value(a)	[1]	$ 3,436,289	3,946,941
Available for Sale, Ratio of Fair Value to Amortized Cost		100.70%
Amortized Cost
Held to Maturity, Due in one year or less		$ 29,063
Held to Maturity, Due after one year through five years		91,045
Held to Maturity, Due after five years through ten years		128,365
Held to Maturity, Due after ten years		1,098,760
Held to Maturity, Total Debt Securities		1,347,233
Held to Maturity, Amortized Cost	[1]	2,200,419	2,740,511
Fair Value
Held to Maturity, Due in one year or less		29,208
Held to Maturity, Due after one year through five years		92,075
Held to Maturity, Due after five years through ten years		132,716
Held to Maturity, Due after ten years		1,165,757
Held to Maturity, Securities, Debt Securities		1,419,755
Held to Maturity, Total debt securities at fair value		$ 2,281,285	2,710,271
Held to Maturity, Ratio of Fair Value to Amortized Cost		103.70%
Private-label
Amortized Cost
Available for Sale, amortized cost		$ 749	1,007
Fair Value
Investment securities available for sale, at fair value(a)		758	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		272,871	297,347
Fair Value
Investment securities available for sale, at fair value(a)		269,789	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		141,678	296,296
Fair Value
Investment securities available for sale, at fair value(a)		143,009	295,252
Amortized Cost
Held to Maturity, Amortized Cost		86,140	92,788
Fair Value
Held to Maturity, Total debt securities at fair value		87,590	91,162
FNMA/FHLMC | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost		19,996
Fair Value
Investment securities available for sale, at fair value(a)		21,791
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		1,075,922	2,169,943
Fair Value
Investment securities available for sale, at fair value(a)		1,080,584	2,128,531
Amortized Cost
Held to Maturity, Amortized Cost		295,370	351,606
Fair Value
Held to Maturity, Total debt securities at fair value		300,108	345,035
GNMA | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost		1,363,848	1,273,309
Fair Value
Investment securities available for sale, at fair value(a)		1,363,948	1,220,797
Amortized Cost
Held to Maturity, Amortized Cost		471,675	505,434
Fair Value
Held to Maturity, Total debt securities at fair value		$ 473,832	$ 490,414
[1]	(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.

Investment Securities Gain_Loss

Investment Securities Gain/Loss Sale of Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Gross gains on available for sale securities	$ 6,347	$ 1,954
Gross gains on held to maturity securities	0	0
Total gains	6,347	1,954
Gross (losses) on available for sale securities	(13,861)	(3,938)
Gross (losses) on held to maturity securities	0	0
Total (losses)	(13,861)	(3,938)
Write-up of equity securities without readily determinable fair values	13,444	0
Investment securities gains (losses), net	5,931	(1,985)
Proceeds from sales of investment securities	$ 1,367,450	$ 601,130

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Sep. 30, 2019USD ($)security	Dec. 31, 2018USD ($)security
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (3,758)	$ (5,262)
Unrealized losses on available for sale securities, 12 months or more	(11,016)	(93,347)
Total unrealized losses on available for sale securities	(14,774)	(98,610)
Fair value of unrealized losses on available for sale securities, less than 12 months	513,592	613,612
Fair value of unrealized losses on available for sale securities, 12 months or more	819,089	3,009,417
Total fair value of unrealized losses on available for sale securities	$ 1,332,681	$ 3,623,028
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	47	41
Available for sale, number of securities, 12 months or more | security	59	190
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	$ (794)	$ (4,053)
Unrealized losses on held to maturity securities, 12 months or more	(5,009)	(43,780)
Total unrealized losses on held to maturity securities	$ (5,803)	$ (47,835)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	40	865
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 73,718	$ 390,929
Fair value of unrealized losses on held to maturity securities, 12 months or more	402,227	1,349,063
Total fair value of unrealized losses on held to maturity securities	$ 475,945	$ 1,739,992
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	31	298
US Treasury Securities
Investment securities available for sale
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
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)(a)
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ 0
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	0
Fair value of unrealized losses on available for sale securities, less than 12 months	348
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	348
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	(705)	$ (2,860)
Unrealized losses on held to maturity securities, 12 months or more	(28)	(12,419)
Total unrealized losses on held to maturity securities	(733)	(15,279)
Fair value of unrealized losses on held to maturity securities, less than 12 months	34,087	313,212
Fair value of unrealized losses on held to maturity securities, 12 months or more	3,846	509,374
Total fair value of unrealized losses on held to maturity securities	$ 37,934	$ 822,586
Obligations of state and political subdivisions (municipal securities)(a) | Held to maturity, number of securities, less than 12 months
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	25	272
Obligations of state and political subdivisions (municipal securities)(a) | Held to maturity, number of securities, 12 months or more
Available-for-sale, Number of Securities
Available for sale, number of securities, 12 months or more | security	0
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	10	752
Private-label
Investment securities available for sale
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
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
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (2,853)	$ (698)
Unrealized losses on available for sale securities, 12 months or more	(270)	0
Total unrealized losses on available for sale securities	(3,123)	(698)
Fair value of unrealized losses on available for sale securities, less than 12 months	241,852	142,432
Fair value of unrealized losses on available for sale securities, 12 months or more	13,213	0
Total fair value of unrealized losses on available for sale securities	$ 255,065	$ 142,432
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	18	13
Available for sale, number of securities, 12 months or more | security	2	0
Other Debt securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (7)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(7)
Fair value of unrealized losses on available for sale securities, less than 12 months	2,993
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	$ 2,993
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	3
Available for sale, number of securities, 12 months or more | security	0
FNMA/FHLMC | Residential Related Securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (38)	$ (31)
Unrealized losses on available for sale securities, 12 months or more	(289)	(3,479)
Total unrealized losses on available for sale securities	(326)	(3,510)
Fair value of unrealized losses on available for sale securities, less than 12 months	21,554	17,993
Fair value of unrealized losses on available for sale securities, 12 months or more	65,798	189,405
Total fair value of unrealized losses on available for sale securities	$ 87,352	$ 207,398
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	6	15
Available for sale, number of securities, 12 months or more | security	10	17
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	$ (8)	$ (780)
Unrealized losses on held to maturity securities, 12 months or more	(9)	(1,015)
Total unrealized losses on held to maturity securities	(17)	(1,795)
Fair value of unrealized losses on held to maturity securities, less than 12 months	3,674	57,896
Fair value of unrealized losses on held to maturity securities, 12 months or more	840	28,888
Total fair value of unrealized losses on held to maturity securities	$ 4,514	$ 86,784
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	3	13
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	1	22
GNMA | Residential Related Securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (440)	$ (4,529)
Unrealized losses on available for sale securities, 12 months or more	(881)	(37,355)
Total unrealized losses on available for sale securities	(1,322)	(41,885)
Fair value of unrealized losses on available for sale securities, less than 12 months	67,563	452,183
Fair value of unrealized losses on available for sale securities, 12 months or more	86,930	1,598,159
Total fair value of unrealized losses on available for sale securities	$ 154,493	$ 2,050,342
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	4	12
Available for sale, number of securities, 12 months or more | security	3	79
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	$ (25)	$ (414)
Unrealized losses on held to maturity securities, 12 months or more	(69)	(7,767)
Total unrealized losses on held to maturity securities	(94)	(8,181)
Fair value of unrealized losses on held to maturity securities, less than 12 months	6,490	19,822
Fair value of unrealized losses on held to maturity securities, 12 months or more	6,938	320,387
Total fair value of unrealized losses on held to maturity securities	$ 13,429	$ 340,209
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	1	13
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	8	66
GNMA | Commercial mortgage-related securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (420)	$ 0
Unrealized losses on available for sale securities, 12 months or more	(9,576)	(52,512)
Total unrealized losses on available for sale securities	(9,996)	(52,512)
Fair value of unrealized losses on available for sale securities, less than 12 months	179,281	0
Fair value of unrealized losses on available for sale securities, 12 months or more	653,148	1,220,854
Total fair value of unrealized losses on available for sale securities	$ 832,429	$ 1,220,854
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	15	0
Available for sale, number of securities, 12 months or more | security	44	93
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	$ (56)	$ 0
Unrealized losses on held to maturity securities, 12 months or more	(4,903)	(22,579)
Total unrealized losses on held to maturity securities	(4,959)	(22,579)
Fair value of unrealized losses on held to maturity securities, less than 12 months	29,467	0
Fair value of unrealized losses on held to maturity securities, 12 months or more	390,602	490,414
Total fair value of unrealized losses on held to maturity securities	$ 420,069	$ 490,414
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	2	0
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	21	25

Investment Securities (Details

Investment Securities (Details Textual) - USD ($) $ in Millions	Feb. 01, 2018	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value				$ 108
Investment Securities (Textuals) [Abstract]
Transfer of securities from held to maturity to available for sale		$ 692
Debt Securities, AFS, Principal Sold		157
Debt Securities, Available-for-sale, Gain (Loss)		$ 3
Carrying amount of Securities Sold						$ 1,200
Visa Restricted Stock Donated			42,039
Visa Restricted Stock Owned		77,000
Debt Securities, Available-for-sale, Sold at Par Value				$ 108
Pledged Financial Instruments, Not Separately Reported, Securities		$ 3,000				3,000	$ 3,000
Federal Home Loan Bank Stock		129				129	173
Federal Reserve Bank Stock		78				78	77
Equity securities with readily determinable fair values, Fair Value		2				2	2
Equity Securities without Readily Determinable Fair Value, Amount		$ 13				$ 13	$ 0
Bank Mutual
Business Acquisition [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value	$ 453
Investment Securities (Textuals) [Abstract]
Debt Securities, Available-for-sale, Sold at Par Value	$ 453
Securities Sold [Member]
Business Acquisition [Line Items]
Taxable Equivalent Yield				3.08%
Securities Reinvest [Member]
Business Acquisition [Line Items]
Taxable Equivalent Yield				3.51%
GNMA [Member] | Commercial mortgage-related securities
Business Acquisition [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value					$ 40
Investment Securities (Textuals) [Abstract]
Debt Securities, Available-for-sale, Sold at Par Value					$ 40

Loans Composition (Details)

Loans Composition (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	$ 22,754,710	$ 22,940,429
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	7,495,623	7,398,044
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	915,524	920,443
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	8,411,147	8,318,487
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	3,803,277	3,751,554
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	1,356,508	1,335,031
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	5,159,784	5,086,585
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	13,570,932	13,405,072
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	$ 7,954,801	8,277,712
Approximate Carrying Amount of Loans Sold	approximately $240 million
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	$ 879,642	894,473
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	349,335	363,171
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans(a)(b)	9,183,778	9,535,357
Carrying Amount Of Loans Sold	33,000
Bank Mutual
Loans and Leases Receivable Disclosure [Line Items]
Purchased credit-impaired loans	$ 2,000	$ 5,000

Loans Credit Quality Indicator

Loans Credit Quality Indicator (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 22,754,710	$ 22,940,429
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	22,240,647	22,438,605
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	251,934	123,988
Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	133,189	249,935
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	128,939	127,901
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,495,623	7,398,044
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,293,226	7,162,370
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	86,434	78,075
Commercial and industrial | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	59,427	116,578
Commercial and industrial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	56,536	41,021
Commercial real estate — owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	915,524	920,443
Commercial real estate — owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	866,287	854,265
Commercial real estate — owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	26,546	6,257
Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	22,624	55,964
Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	68	3,957
Commercial and business lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	8,411,147	8,318,487
Commercial and business lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	8,159,513	8,016,635
Commercial and business lending | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	112,980	84,332
Commercial and business lending | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	82,051	172,542
Commercial and business lending | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	56,604	44,978
Commercial real estate — investor
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,803,277	3,751,554
Commercial real estate — investor | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,634,780	3,653,642
Commercial real estate — investor | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	114,343	28,479
Commercial real estate — investor | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	49,353	67,481
Commercial real estate — investor | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,800	1,952
Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,356,508	1,335,031
Real estate construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,332,930	1,321,447
Real estate construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	22,492	8,771
Real estate construction | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	544	3,834
Real estate construction | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	542	979
Commercial real estate lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	5,159,784	5,086,585
Commercial real estate lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,967,710	4,975,089
Commercial real estate lending | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	136,835	37,249
Commercial real estate lending | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	49,897	71,315
Commercial real estate lending | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	5,342	2,931
Total commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	13,570,932	13,405,072
Total commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	13,127,223	12,991,724
Total commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	249,815	121,582
Total commercial | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	131,948	243,856
Total commercial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	61,946	47,909
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 7,954,801	8,277,712
Approximate Carrying Amount of Loans Sold	approximately $240 million
Residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 7,896,073	8,203,729
Residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	430	434
Residential mortgage | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,242	5,975
Residential mortgage | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	57,056	67,574
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	879,642	894,473
Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	868,854	880,808
Home equity | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	961	1,223
Home equity | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	0	103
Home equity | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,828	12,339
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	349,335	363,171
Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	348,498	362,343
Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	728	749
Other consumer | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	0	0
Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	109	79
Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,183,778	9,535,357
Carrying Amount Of Loans Sold	33,000
Total consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,113,424	9,446,881
Total consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,119	2,406
Total consumer | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,242	6,078
Total consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	66,993	$ 79,992
Carrying Amount Of Loans Sold	$ 12,000

Loans Past Due Status (Details)

Loans Past Due Status (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Summarized details of Loans
Current	$ 22,604,417	$ 22,785,019
Nonaccrual(a)	128,939	127,901
Total loans	22,754,710	22,940,429
Nonaccrual Loans, Current Portion	$ 47,000	$ 74,000
Percent of current nonaccrual loans	36.00%	58.00%
30-59 Days Past Due
Summarized details of Loans
Total Past Due	$ 16,462	$ 21,550
60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,905	3,795
90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,986	2,165
30-89 Days Past Due
Summarized details of Loans
Approximate Carrying Amount of Loans Sold	approximately $200,000
Commercial and industrial
Summarized details of Loans
Current	$ 7,438,395	7,356,187
Nonaccrual(a)	56,536	41,021
Total loans	7,495,623	7,398,044
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	220	187
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	206	338
Commercial and industrial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	266	311
Commercial real estate — owner occupied
Summarized details of Loans
Current	912,810	913,787
Nonaccrual(a)	68	3,957
Total loans	915,524	920,443
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,646	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	8,351,205	8,269,974
Nonaccrual(a)	56,604	44,978
Total loans	8,411,147	8,318,487
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,867	2,767
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	206	457
Commercial and business lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	266	311
Commercial real estate — investor
Summarized details of Loans
Current	3,797,840	3,745,835
Nonaccrual(a)	4,800	1,952
Total loans	3,803,277	3,751,554
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	2,954
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	636	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	1,355,371	1,333,722
Nonaccrual(a)	542	979
Total loans	1,356,508	1,335,031
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	571	330
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	24	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	5,153,211	5,079,557
Nonaccrual(a)	5,342	2,931
Total loans	5,159,784	5,086,585
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	571	3,284
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	661	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	13,504,416	13,349,531
Nonaccrual(a)	61,946	47,909
Total loans	13,570,932	13,405,072
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,438	6,051
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	866	1,270
Total commercial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	266	311
Residential mortgage
Summarized details of Loans
Current	7,889,681	8,200,432
Nonaccrual(a)	57,056	67,574
Total loans	$ 7,954,801	8,277,712
Approximate Carrying Amount of Loans Sold	approximately $240 million
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	$ 7,866	9,272
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	197	434
Residential mortgage | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Total consumer
Summarized details of Loans
Total loans	9,183,778	9,535,357
Carrying Amount Of Loans Sold	33,000
Home equity
Summarized details of Loans
Current	865,017	876,085
Nonaccrual(a)	9,828	12,339
Total loans	879,642	894,473
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,837	4,826
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	961	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	345,303	358,970
Nonaccrual(a)	109	79
Total loans	349,335	363,171
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,321	1,401
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	881	868
Other consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,720	1,853
Total consumer
Summarized details of Loans
Current	9,100,001	9,435,487
Nonaccrual(a)	66,993	79,992
Total loans	9,183,778	9,535,357
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	13,025	15,499
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,038	2,525
Total consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,720	$ 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	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 119,925	$ 133,690
Unpaid Principal Balance	171,354	164,766
Related Allowance	23,291	15,304
Average Recorded Investment	108,675	145,707
Interest Income Recognized	$ 2,338	$ 3,626
Net Recorded Investment of the Impaired Loans	56.00%	72.00%
Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 81,787	$ 96,609
Unpaid Principal Balance	95,157	102,483
Related Allowance	23,291	15,304
Average Recorded Investment	83,840	110,079
Interest Income Recognized	1,883	3,699
Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	38,138	37,081
Unpaid Principal Balance	76,197	62,283
Related Allowance	0	0
Average Recorded Investment	24,835	35,627
Interest Income Recognized	456	73
Commercial and industrial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	70,568	63,153
Unpaid Principal Balance	118,829	87,155
Related Allowance	17,791	5,721
Average Recorded Investment	59,887	73,813
Interest Income Recognized	1,003	823
Commercial and industrial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	48,597	40,747
Unpaid Principal Balance	59,132	42,131
Related Allowance	17,791	5,721
Average Recorded Investment	45,439	52,461
Interest Income Recognized	1,003	1,167
Commercial and industrial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	21,971	22,406
Unpaid Principal Balance	59,697	45,024
Related Allowance	0	0
Average Recorded Investment	14,448	21,352
Interest Income Recognized	0	344
Commercial real estate — owner occupied
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,912	5,852
Unpaid Principal Balance	1,919	6,910
Related Allowance	19	24
Average Recorded Investment	1,988	6,154
Interest Income Recognized	78	104
Commercial real estate — owner occupied | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,912	2,080
Unpaid Principal Balance	1,919	2,087
Related Allowance	19	24
Average Recorded Investment	1,988	2,179
Interest Income Recognized	78	104
Commercial real estate — owner occupied | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	0	3,772
Unpaid Principal Balance	0	4,823
Related Allowance	0	0
Average Recorded Investment	0	3,975
Interest Income Recognized	0	0
Commercial and business lending
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	72,480	69,005
Unpaid Principal Balance	120,748	94,065
Related Allowance	17,811	5,745
Average Recorded Investment	61,875	79,967
Interest Income Recognized	1,081	927
Commercial and business lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	50,510	42,827
Unpaid Principal Balance	61,051	44,218
Related Allowance	17,811	5,745
Average Recorded Investment	47,427	54,640
Interest Income Recognized	1,081	1,271
Commercial and business lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	21,971	26,178
Unpaid Principal Balance	59,697	49,847
Related Allowance	0	0
Average Recorded Investment	14,448	25,327
Interest Income Recognized	0	344
Commercial real estate — investor
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	5,104	2,384
Unpaid Principal Balance	6,280	3,625
Related Allowance	101	28
Average Recorded Investment	1,417	1,807
Interest Income Recognized	180	106
Commercial real estate — investor | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,400	799
Unpaid Principal Balance	2,575	805
Related Allowance	101	28
Average Recorded Investment	780	827
Interest Income Recognized	21	38
Commercial real estate — investor | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,705	1,585
Unpaid Principal Balance	3,705	2,820
Related Allowance	0	0
Average Recorded Investment	637	980
Interest Income Recognized	159	68
Real estate construction
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	409	510
Unpaid Principal Balance	490	589
Related Allowance	56	75
Average Recorded Investment	419	533
Interest Income Recognized	21	32
Real estate construction | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	409	510
Unpaid Principal Balance	490	589
Related Allowance	56	75
Average Recorded Investment	419	533
Interest Income Recognized	21	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	5,514	2,894
Unpaid Principal Balance	6,770	4,214
Related Allowance	157	103
Average Recorded Investment	1,836	2,340
Interest Income Recognized	201	138
Commercial real estate lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,809	1,309
Unpaid Principal Balance	3,066	1,394
Related Allowance	157	103
Average Recorded Investment	1,199	1,360
Interest Income Recognized	42	70
Commercial real estate lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,705	1,585
Unpaid Principal Balance	3,705	2,820
Related Allowance	0	0
Average Recorded Investment	637	980
Interest Income Recognized	159	68
Total commercial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	77,994	71,899
Unpaid Principal Balance	127,518	98,279
Related Allowance	17,968	5,848
Average Recorded Investment	63,712	82,307
Interest Income Recognized	1,282	1,065
Total commercial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	52,319	44,136
Unpaid Principal Balance	64,116	45,612
Related Allowance	17,968	5,848
Average Recorded Investment	48,626	56,000
Interest Income Recognized	1,123	1,341
Total commercial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	25,675	27,763
Unpaid Principal Balance	63,402	52,667
Related Allowance	0	0
Average Recorded Investment	15,086	26,307
Interest Income Recognized	159	276
Residential mortgage
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	36,039	50,486
Unpaid Principal Balance	37,515	54,223
Related Allowance	3,824	6,023
Average Recorded Investment	35,905	51,477
Interest Income Recognized	902	1,992
Residential mortgage | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	24,621	41,691
Unpaid Principal Balance	25,783	45,149
Related Allowance	3,824	6,023
Average Recorded Investment	27,173	42,687
Interest Income Recognized	623	1,789
Residential mortgage | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	11,418	8,795
Unpaid Principal Balance	11,732	9,074
Related Allowance	0	0
Average Recorded Investment	8,732	8,790
Interest Income Recognized	279	203
Home equity
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	4,648	10,124
Unpaid Principal Balance	5,075	11,081
Related Allowance	1,313	3,312
Average Recorded Investment	7,812	10,739
Interest Income Recognized	154	566
Home equity | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,604	9,601
Unpaid Principal Balance	4,011	10,539
Related Allowance	1,313	3,312
Average Recorded Investment	6,796	10,209
Interest Income Recognized	136	566
Home equity | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,044	523
Unpaid Principal Balance	1,063	542
Related Allowance	0	0
Average Recorded Investment	1,017	530
Interest Income Recognized	18	0
Other consumer
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,244	1,181
Unpaid Principal Balance	1,246	1,183
Related Allowance	187	121
Average Recorded Investment	1,246	1,184
Interest Income Recognized	1	3
Other consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,244	1,181
Unpaid Principal Balance	1,246	1,183
Related Allowance	187	121
Average Recorded Investment	1,246	1,184
Interest Income Recognized	1	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	41,931	61,791
Unpaid Principal Balance	43,836	66,487
Related Allowance	5,323	9,456
Average Recorded Investment	44,964	63,400
Interest Income Recognized	1,056	2,561
Total consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	29,468	52,473
Unpaid Principal Balance	31,041	56,871
Related Allowance	5,323	9,456
Average Recorded Investment	35,214	54,080
Interest Income Recognized	760	2,358
Total consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	12,462	9,318
Unpaid Principal Balance	12,795	9,616
Related Allowance	0	0
Average Recorded Investment	9,749	9,320
Interest Income Recognized	$ 297	$ 203

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	$ 24,329	$ 53,263
Nonaccrual Restructured Loans(a)	16,293	26,292
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	15,398	25,478
Nonaccrual Restructured Loans(a)	0	249
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,912	2,080
Nonaccrual Restructured Loans(a)	0	0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	304	799
Nonaccrual Restructured Loans(a)	461	933
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	227	311
Nonaccrual Restructured Loans(a)	182	198
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	3,228	16,036
Nonaccrual Restructured Loans(a)	14,090	22,279
Carrying Amount Of Loans Sold	18,000
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	2,017	7,385
Nonaccrual Restructured Loans(a)	1,559	2,627
Carrying Amount Of Loans Sold	3,000
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,243	1,174
Nonaccrual Restructured Loans(a)	1	$ 6
Pass | Total consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Carrying Amount Of Loans Sold	21,000
Nonaccrual | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Carrying Amount Of Loans Sold	$ 7,000

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)loan	Sep. 30, 2018USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	67	71
Recorded Investment(a)	$ 7,500	$ 10,138
Unpaid Principal Balance(b)	$ 7,577	$ 10,353
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	6
Recorded Investment(a)	$ 185	$ 1,954
Unpaid Principal Balance(b)	$ 185	$ 1,995
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 958
Unpaid Principal Balance(b)	$ 0	$ 1,022
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	47	29
Recorded Investment(a)	$ 6,785	$ 5,655
Unpaid Principal Balance(b)	$ 6,863	$ 5,733
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	18	32
Recorded Investment(a)	$ 520	$ 1,552
Unpaid Principal Balance(b)	$ 520	$ 1,582
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	3
Recorded Investment(a)	$ 9	$ 19
Unpaid Principal Balance(b)	$ 9	$ 21

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)loan	Sep. 30, 2018USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	47	43
Recorded Investment | $	$ 5,526	$ 4,178
Total commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	3
Recorded Investment | $	$ 0	$ 0
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment | $	$ 461	$ 0
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	27	12
Recorded Investment | $	$ 4,528	$ 2,579
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	19	28
Recorded Investment | $	$ 538	$ 1,599

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 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	(57,560)	(50,536)
Recoveries	16,462	20,179
Net Charge offs	(41,098)	(30,358)
Provision for loan losses	17,500	2,500
Balance at end of period	214,425	238,023
Allowance for loan losses
Individually evaluated			$ 23,291	$ 15,304
Collectively evaluated			191,133	222,719
Total allowance for loan losses	214,425	265,880	214,425	238,023
Loans
Individually evaluated			119,925	133,690
Collectively evaluated			22,633,075	22,801,887
Acquired and accounted for under ASC 310-30(a)			1,710	4,853
Total loans			22,754,710	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	(49,845)	(30,837)
Recoveries	10,322	13,714
Net Charge offs	(39,523)	(17,123)
Provision for loan losses	36,419	2,890
Balance at end of period	105,730	108,835
Allowance for loan losses
Individually evaluated			17,791	5,721
Collectively evaluated			87,939	103,114
Total allowance for loan losses	108,835	108,835	105,730	108,835
Loans
Individually evaluated			70,568	63,153
Collectively evaluated			7,424,690	7,331,898
Acquired and accounted for under ASC 310-30(a)			365	2,994
Total loans			7,495,623	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	(222)	(1,363)
Recoveries	2,795	639
Net Charge offs	2,573	(724)
Provision for loan losses	(3,229)	(373)
Balance at end of period	8,599	9,255
Allowance for loan losses
Individually evaluated			19	24
Collectively evaluated			8,579	9,231
Total allowance for loan losses	8,599	10,352	8,599	9,255
Loans
Individually evaluated			1,912	5,852
Collectively evaluated			912,935	913,708
Acquired and accounted for under ASC 310-30(a)			677	883
Total loans			915,524	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	(971)	7,031
Balance at end of period	39,904	40,844
Allowance for loan losses
Individually evaluated			101	28
Collectively evaluated			39,803	40,816
Total allowance for loan losses	40,844	40,844	39,904	40,844
Loans
Individually evaluated			5,104	2,384
Collectively evaluated			3,798,039	3,748,883
Acquired and accounted for under ASC 310-30(a)			134	287
Total loans			3,803,277	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	(60)	(298)
Recoveries	230	446
Net Charge offs	170	149
Provision for loan losses	(4,960)	(6,279)
Balance at end of period	23,451	28,240
Allowance for loan losses
Individually evaluated			56	75
Collectively evaluated			23,395	28,165
Total allowance for loan losses	28,240	28,240	23,451	28,240
Loans
Individually evaluated			409	510
Collectively evaluated			1,356,088	1,334,500
Acquired and accounted for under ASC 310-30(a)			11	21
Total loans			1,356,508	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	(1,754)	(1,627)
Recoveries	539	1,271
Net Charge offs	(1,215)	(355)
Provision for loan losses	(5,757)	(3,657)
Balance at end of period	18,623	25,595
Allowance for loan losses
Individually evaluated			3,824	6,023
Collectively evaluated			14,799	19,572
Total allowance for loan losses	18,623	29,607	18,623	25,595
Loans
Individually evaluated			36,039	50,486
Collectively evaluated			7,918,265	8,226,642
Acquired and accounted for under ASC 310-30(a)			497	584
Total loans			7,954,801	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	(1,605)	(3,236)
Recoveries	1,878	2,628
Net Charge offs	273	(608)
Provision for loan losses	(7,690)	(2,252)
Balance at end of period	11,849	19,266
Allowance for loan losses
Individually evaluated			1,313	3,312
Collectively evaluated			10,536	15,954
Total allowance for loan losses	19,266	19,266	11,849	19,266
Loans
Individually evaluated			4,648	10,124
Collectively evaluated			874,968	884,266
Acquired and accounted for under ASC 310-30(a)			26	83
Total loans			879,642	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	(4,074)	(5,261)
Recoveries	667	812
Net Charge offs	(3,407)	(4,448)
Provision for loan losses	3,688	5,138
Balance at end of period	6,269	5,988
Allowance for loan losses
Individually evaluated			187	121
Collectively evaluated			6,082	5,867
Total allowance for loan losses	$ 6,269	$ 5,298	6,269	5,988
Loans
Individually evaluated			1,244	1,181
Collectively evaluated			348,091	361,990
Acquired and accounted for under ASC 310-30(a)			0	0
Total loans			$ 349,335	$ 363,171

Loans Loans Changes in the Allo

Loans Loans Changes in the Allowance for Loan Losses by Oil and Gas Segment (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 238,023	$ 265,880
Charge offs	(57,560)	(50,536)
Recoveries	16,462	20,179
Net Charge offs	(41,098)	(30,358)
Provision for loan losses	17,500	2,500
Balance at end of period	214,425	238,023
Allowance for loan losses
Individually evaluated for impairment			$ 23,291	$ 15,304
Collectively evaluated for impairment			191,133	222,719
Total allowance for loan losses	214,425	265,880	214,425	238,023
Loans
Individually evaluated for impairment			119,925	133,690
Collectively evaluated for impairment			22,633,075	22,801,887
Total loans			22,754,710	22,940,429
Oil and Gas
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	12,000	27,000
Charge offs	(39,000)	(24,000)
Recoveries	5,000	6,000
Net Charge offs	(34,000)	(17,000)
Provision for loan losses	44,000	2,000
Balance at end of period	21,000	12,000
Allowance for loan losses
Individually evaluated for impairment			11,000	0
Collectively evaluated for impairment			10,000	12,000
Total allowance for loan losses	$ 21,000	$ 12,000	21,000	12,000
Loans
Individually evaluated for impairment			36,000	22,000
Collectively evaluated for impairment			545,000	725,000
Total loans			$ 582,000	$ 747,000

Loans, Changes in the Allowan_2

Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Change in the allowance for unfunded commitments
Balance at beginning of period	$ 24,000
Balance at end of period	23,000	$ 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	70	2,436
Balance at end of period	$ 22,907	$ 24,336

Loans Changes to Accretable Yie

Loans Changes to Accretable Yield (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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	(912)	(4,954)
Net reclassification from non-accretable yield	23	1,605
Other(a)	0	(22)
Balance at end of period	$ 595	$ 1,482

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Recorded Investment, loans modified in troubled debt restructuring	$ 7,500	$ 10,138
Restructured Loans Subsequently Accruing	2,000
Ytd Restructured Loans Still On Nonaccrual	5,000
Net unaccreted purchase discount	15,000		$ 20,000
Unaccreted purchase discount, performing loans	14,000		18,000
Unaccreted purchase discount, nonperforming loans	1,000		2,000
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for loan losses	214,425		238,023	$ 265,880
Bank Mutual
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchased credit-impaired loans	2,000		5,000
Huntington National Bank
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchased credit-impaired loans	0
Oil and Gas
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for loan losses	$ 21,000		$ 12,000	$ 27,000
Percent of Loans	3.70%		1.60%

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 2,686	$ 2,233	$ 7,237	$ 5,926
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	80,730		80,730		$ 58,100
Accumulated amortization	(10,438)		(10,438)		(5,326)
Net book value	70,292		70,292		52,774
Amortization of other intangible assets			5,112		5,326
Additions during the period
Summary of core deposit intangibles and other intangibles
Additions during the period			22,630		58,100
Other Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount	44,887		44,887		44,931
Reductions due to sale			(140)		(43)
Accumulated amortization	(23,950)		(23,950)		(21,825)
Net book value	$ 20,797		20,797		23,062
Additions during the period			0		10,359
Amortization of other intangible assets			$ 2,125		$ 2,833

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$ 68,433	$ 59,168
Additions from acquisition	0	8,136
Additions	8,900	10,722
Amortization	(8,749)	(9,594)
Mortgage servicing rights at end of period	68,584	68,433
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period	(239)	(784)
(Additions) recoveries, net	(177)	545
Valuation allowance at end of period	(416)	(239)
Mortgage servicing rights, net	68,168	68,193
Fair value of mortgage servicing rights	70,241	81,012
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 8,688,012	$ 8,600,983
Mortgage servicing rights, net to servicing portfolio	0.78%	0.79%
Mortgage servicing rights expense(a)	$ 8,926	$ 9,049

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Core Deposit Intangibles
Estimated future amortization expense
Three Months Ending December 31, 2019	$ 2,018
Year ending December 31, 2020	8,073
Year ending December 31, 2021	8,073
Year ending December 31, 2022	8,073
Year ending December 31, 2023	8,073
Year ending December 31, 2024	8,073
Beyond 2024	27,909
Net book value	70,292	$ 52,774
Other Intangibles
Estimated future amortization expense
Three Months Ending December 31, 2019	693
Year ending December 31, 2020	2,690
Year ending December 31, 2021	2,666
Year ending December 31, 2022	2,642
Year ending December 31, 2023	2,623
Year ending December 31, 2024	2,603
Beyond 2024	6,879
Net book value	20,797	$ 23,062
Mortgage Servicing Rights
Estimated future amortization expense
Three Months Ending December 31, 2019	3,234
Year ending December 31, 2020	12,262
Year ending December 31, 2021	10,074
Year ending December 31, 2022	8,259
Year ending December 31, 2023	6,777
Year ending December 31, 2024	5,574
Beyond 2024	22,403
Net book value	$ 68,584

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Details Textuals) - USD ($) $ in Thousands	Jun. 14, 2019	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment Loss			$ 0	$ 0
Goodwill		$ 1,176,230	$ 1,176,230	$ 1,169,023
Huntington National Bank
Business Acquisition [Line Items]
Goodwill acquired	$ 7,000	$ 210

Short and Long-Term Funding (Co

Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Short-term Funding [Abstract]
Federal funds purchased	$ 75	$ 19,710
Securities sold under agreements to repurchase	77,953	91,941
Federal funds purchased and securities sold under agreements to repurchase	78,028	111,651
Commercial paper	30,416	45,423
Total short-term funding	108,444	157,074
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
Other long-term funding and capitalized costs	(3,201)	(4,389)
Total long-term funding	796,799	795,611
Total short and long-term funding, excluding FHLB advances	905,243	952,685
FHLB Advances
Short-term FHLB advances	215,000	900,000
Long-term FHLB advances	2,662,727	2,674,371
Total FHLB advances	2,877,727	3,574,371
Total short and long-term funding, excluding FHLB advances	3,782,970	4,527,056
Corporation senior notes, at par, due 2019
Long-Term Funding
Senior notes	250,000	250,000
Bank senior notes, at par, due 2021
Long-Term Funding
Senior notes	$ 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	Sep. 30, 2019	Dec. 31, 2018
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 77,953	$ 91,941
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	77,953	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	77,953	91,941
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	77,953	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	Sep. 30, 2019	Dec. 31, 2018
FHLB_Maturity_ [Line Items]
FHLB advances	$ 2,877,727	$ 3,574,371
Weighted Average Contractual Coupon Rate	2.28%	2.19%
Maturity or put date 1 year or less
FHLB_Maturity_ [Line Items]
FHLB advances	$ 2,376,052	$ 2,262,584
Weighted Average Contractual Coupon Rate	2.24%	2.06%
After 1 but within 2
FHLB_Maturity_ [Line Items]
FHLB advances	$ 288,174	$ 1,285,039
Weighted Average Contractual Coupon Rate	2.57%	2.39%
After 2 but within 3
FHLB_Maturity_ [Line Items]
FHLB advances	$ 5,781	$ 14,393
Weighted Average Contractual Coupon Rate	5.11%	2.98%
After 3 years
FHLB_Maturity_ [Line Items]
FHLB advances	$ 207,720	$ 12,354
Weighted Average Contractual Coupon Rate	2.30%	4.55%

Short and Long-Term Funding (Lo

Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Thousands	Aug. 13, 2018	Nov. 13, 2014	Nov. 30, 2014	Sep. 30, 2019	Dec. 31, 2018
Long-Term Funding
FHLB advances				$ 2,877,727	$ 3,574,371
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed				164,000
Two Thousand Eighteen Senior Notes [Member] [Domain]
Long-Term Funding
Debt Instrument, Issuance Date Month, Year	2018-08
New Senior Debt Issued	$ 300,000
Debt Instrument, Maturity Date Month, Year	2021-08
Debt Instrument Call Date Earliest Month Year	2021-07
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Two Thousand Fourteen Senior Notes [Member]
Long-Term Funding
Debt Instrument, Issuance Date Month, Year		2014-11
New Senior Debt Issued			$ 250,000
Debt Instrument, Maturity Date Month, Year		2019-11
Debt Instrument Call Date Earliest Month Year		2019-10
Debt Instrument, Interest Rate, Stated Percentage			2.75%
Debt Instrument, Called Date		Oct. 15, 2019
FHLBDecreaseinAdvances [Domain]
Long-Term Funding
FHLB advances					$ 697,000
FLHB Advances, Putable [Domain]
Long-Term Funding
FHLB advances				$ 2,400,000
FHLB Short Term Advances [Member]
Long-Term Funding
FHLB Put Contractual Maturity Weighted Average Life1				4 months 9 days
FHLB Long Term Advances [Member]
Long-Term Funding
FHLB Put Contractual Maturity Weighted Average Life1				5 years 5 months 1 day
Two Thousand Fourteen Subordinated Notes
Long-Term Funding
Debt Instrument, Issuance Date Month, Year		2014-11
Junior Subordinated Debentures Issued			$ 250,000
Debt Instrument, Term			10 years
Debt Instrument, Maturity Date Month, Year		2025-01
Debt Instrument Call Date Earliest Month Year		2024-10
Subordinated Borrowing, Interest Rate			4.25%

Derivative and Hedging Activi_3

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Asset
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other assets), fair value	$ 131,061	$ 91,260
Less: Legally enforceable master netting agreements	4,629	5,322
Less: Cash collateral pledged/received	16,182	27,593
Derivative Asset	110,250	58,345
Liability
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other liabilities), fair value	45,770	89,889
Less: Legally enforceable master netting agreements	4,629	5,322
Less: Cash collateral pledged/received	14,680	63
Derivatives (trading liabilities)	26,461	84,504
Designated as hedging instruments
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	500,000
Designated as hedging instruments | Asset | Interest rate-related instruments
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	500,000	0
Derivatives (trading and other assets), fair value	114	0
Designated as hedging instruments | Liability | Interest rate-related instruments
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	0	500,000
Derivatives (trading and other liabilities), fair value	0	40
Not designated as hedging instruments | Asset
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other assets), fair value	130,947	91,260
Not designated as hedging instruments | Asset | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,799,863	2,707,204
Derivatives (trading and other assets), fair value	100,376	52,796
Not designated as hedging instruments | Asset | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	211,475	117,879
Derivatives (trading and other assets), fair value	3,153	721
Not designated as hedging instruments | Asset | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	259,210	331,727
Derivatives (trading and other assets), fair value	25,388	35,426
Not designated as hedging instruments | Asset | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	300,515	191,222
Derivatives (trading and other assets), fair value	2,017	2,208
Not designated as hedging instruments | Asset | Time deposits
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	518	11,185
Derivatives (trading and other assets), fair value	13	109
Not designated as hedging instruments | Liability
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other liabilities), fair value	45,770	89,849
Not designated as hedging instruments | Liability | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	2,799,863	2,707,204
Derivatives (trading and other liabilities), fair value	17,586	52,653
Not designated as hedging instruments | Liability | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	184,476	69,153
Derivatives (trading and other liabilities), fair value	2,823	675
Not designated as hedging instruments | Liability | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	258,483	315,861
Derivatives (trading and other liabilities), fair value	24,758	34,340
Not designated as hedging instruments | Liability | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	227,060	139,984
Derivatives (trading and other liabilities), fair value	590	2,072
Not designated as hedging instruments | Liability | Time deposits
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	518	11,185
Derivatives (trading and other liabilities), fair value	$ 13	$ 109

Derivative and Hedging Activi_4

Derivative and Hedging Activities Cumulative Basis Adjustment for Fair Value Hedges (Details) - Designated as Hedging Instrument $ in Thousands	Sep. 30, 2019USD ($)
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)	$ 6,000
Amortized cost basis of hedged asset	947,000
Derivative Asset, Notional Amount	500,000
Carrying Amount of the Hedged Assets/(Liabilities)
Balance Sheet Recording of Fair Value Hedge [Line Items]
Derivative Asset	506,111
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)
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)	$ 6,111

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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (59)	$ (17)	$ 160	$ (30)
Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0	0	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	452	(2,522)	6,674	(4,931)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0	0	0
Designated as Hedging Instrument | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(511)	2,506	(6,514)	4,902
Designated as Hedging Instrument | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0	$ 0	$ 0	$ 0

Derivative and Hedging Activi_6

Derivative and Hedging Activities Derivative Impact on Perfomance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Capital markets, net | Interest rate-related instruments — customer and mirror, net
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (619)	$ 246	$ (2,309)	$ 354
Capital markets, net | Foreign currency exchange forwards
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	72	(92)	284	(22)
Capital markets, net | Commodity contracts
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	208	(72)	(456)	(958)
Mortgage banking, net | Interest rate lock commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2,851)	(1,602)	(191)	147
Mortgage banking, net | Forward commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 1,313	$ 2,271	$ 1,482	$ 1,665

Derivative and Hedging Activi_7

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 47	$ 36
Derivative collateral right to reclaim cash	$ 15	$ 1

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative assets(a)
Gross Amounts Recognized	$ 24,930	$ 65,596
Derivative Liabilities Offset	(4,629)	(5,322)
Derivative Asset, Collateral, Obligation to Return Cash, Offset	16,182	27,593
Net Amounts Presented on the Consolidated Balance Sheets	4,118	32,681
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	31,837
Net amount	4,118	843
Derivative liabilities(a)
Gross Amounts Recognized	19,537	22,951
Derivative Liability, Fair Value, Gross Asset	4,629	5,322
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	14,680	63
Net Amounts Presented on the Consolidated Balance Sheets	228	17,567
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	17,551
Net amount	$ 228	$ 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	Sep. 30, 2019	Dec. 31, 2018
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 0	$ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
Summary of lending-related and other commitments
Lending related commitments	8,909,815	8,720,293
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	8,119	7,599
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	272,376	255,904
Standby letters of credit, fair value	$ 3,000	$ 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	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Residential mortgage repurchase reserve
Balance at beginning of period	$ 24,000
Balance at end of period	23,000	$ 24,000
Mortgage Repurchase Reserve
Residential mortgage repurchase reserve
Balance at beginning of period	752	987
Repurchase provision expense	309	345
Adjustments to provision expense	0	(450)
Repurchase/reimbursement charges taken	(299)	(218)
Amount recorded at acquisition	0	88
Balance at end of period	$ 762	$ 752

Commitments, Off-Balance Shee_5

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Unfunded Commitments	$ 23,000		$ 23,000		$ 24,000
Expense Related to Qualified Affordable Housing Projects	4,000	$ 4,000	14,000	$ 13,000
Remaining Investment in Qualified Affordable Housing Projects	210,000		210,000		132,000
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount	112,000		112,000		51,000
Loans Repurchased Under Make Whole Requests	2,000		$ 2,000		$ 2,000
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid			negligible		negligible
Loans Sold To Outside Investors Original Amount	12,200,000		$ 12,200,000
Loans Sold To Outside Investors Remaining Outstanding Amount	7,600,000		7,600,000
Residential Mortgage Loans Sold With Recourse Risk	44,000		44,000		$ 47,000
Residential Mortgage Loans Sold With Credit Recourse Risk	48,000		48,000		57,000
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	224,000		224,000		136,000
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	$ 26,000		$ 26,000		$ 25,000

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	[1]	$ 3,436,289	$ 3,946,941
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		3,436,289	3,945,943
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets		2,017	2,208
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities		590	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		1,652	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		1,080,584	2,128,531
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Private-label
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale		758	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		269,789	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		2,993	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		3,436,289	3,945,943
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential loans held for sale
Assets, Fair Value Disclosure [Abstract]
Trading assets		137,655	64,321
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror, net
Assets, Fair Value Disclosure [Abstract]
Trading assets		100,376	52,796
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities		17,586	52,653
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Assets, Fair Value Disclosure [Abstract]
Trading assets		3,153	721
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities		2,823	675
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading assets		25,388	35,426
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities		24,758	34,340
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Purchased options (time deposit)
Assets, Fair Value Disclosure [Abstract]
Trading assets		13	109
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities		13	109
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest rate lock commitments (mortgage)
Assets, Fair Value Disclosure [Abstract]
Trading assets		2,017	2,208
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities		590	2,072
Designated as Hedging Instrument | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Interest Rate Fair Value Hedge Asset at Fair Value		114	0
Liabilities, Fair Value Disclosure [Abstract]
Interest Rate Fair Value Hedge Liability at Fair Value		0	40
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale		143,009	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		21,791	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		1,363,948	1,220,797
Obligations of state and political subdivisions (municipal securities)(a)
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale		553,418
Obligations of state and political subdivisions (municipal securities)(a) | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale		$ 553,418	$ 0
[1]	(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.

Fair Value Measurements Financi

Fair Value Measurements Financial Instruments Classified Within Level 3 (Details) - Derivative Financial Instruments - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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 gain (loss)	1,292	(1,085)
Ending Balance	$ 1,428	$ 140

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2018	$ 0
Upward carrying value changes	13,444	$ 0
Carrying value as of September 30, 2019	13,000
Fair Value, Inputs, Level 3
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2018	0
Upward carrying value changes	13,444
Carrying value as of September 30, 2019	13,444
Cumulative upward carrying value changes between January 1, 2018 and September 30, 2019	13,444
Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2019	$ 0

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 70,241		$ 81,012
Mortgage banking, net	177	$ (669)
Equity securities	13,000		0
Investment securities gains (losses), net	15,096		1,568
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity securities	13,444		0
Investment securities gains (losses), net	13,444		0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
OREO(c)	2,413		2,200
Other noninterest expense	(1,453)		(1,545)
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Impaired loans(a)	51,501		26,191
Provision for credit losses(b)	(60,627)		(14,521)
Mortgage servicing rights	70,241		81,012
Mortgage banking, net	(177)		$ 545
Equity securities	13,444
Investment securities gains (losses), net	$ 13,444

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Unobservable Level 3 Measurements (Details) - Fair Value, Inputs, Level 3	9 Months Ended
	Sep. 30, 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	9.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	13.00%
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	48.00%

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Financial assets
Cash and due from banks		$ 523,435	$ 507,187
Interest-bearing deposits in other financial institutions		236,010	221,226
Federal funds sold and securities purchased under agreements to resell		100	148,285
Investment securities held to maturity	[1]	2,200,419	2,740,511
Investment securities held to maturity, fair value		2,281,285	2,710,271
Investment securities available for sale	[1]	3,436,289	3,946,941
Equity securities with readily determinable fair values, Fair Value		2,000	2,000
Equity Securities without Readily Determinable Fair Value, Amount		13,000	0
Investment securities gains (losses), net		15,096	1,568
FHLB and Federal Reserve Bank stocks		207,443	250,534
Loans, net		22,540,285	22,702,406
Financial liabilities
Short-term funding		108,444	157,074
Other long-term funding		796,799	795,611
FHLB advances		2,877,727	3,574,371
Letters of Credit Outstanding, Amount		272,000	256,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks		523,435	507,187
Cash and due from banks, Fair Value		523,435	507,187
Interest-bearing deposits in other financial institutions		236,010	221,226
Interest-bearing deposits in other financial institutions, fair value		236,010	221,226
Federal funds sold and securities purchased under agreements to resell		100	148,285
Federal funds sold and securities purchased under agreements to resell, fair value		100	148,285
Investment securities held to maturity		999	0
Investment securities held to maturity, fair value		1,019	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		1,652	1,568
Equity securities with readily determinable fair values, Fair Value		1,652	1,568
Fair Value, Inputs, Level 2
Financial assets
Investment securities held to maturity		2,199,420	2,740,511
Investment securities held to maturity, fair value		2,280,265	2,710,271
Investment securities available for sale		3,436,289	3,945,943
Investment securities available for sale, fair value		3,436,289	3,945,943
FHLB and Federal Reserve Bank stocks		207,443	250,534
FHLB and Federal Reserve Bank stocks, fair value		207,443	250,534
Residential Loans Receivable Held-for-sale, Net, Not Part of Disposal Group		137,655	64,321
Residential Held-for-sale, Fair Value Disclosure		137,655	64,321
Commercial loans held for sale		11,597	14,943
Commercial Loans Held-for-sale, Fair Value Disclosure		11,597	14,943
Bank and Corporate Owned Life Insurance		670,739	663,203
Bank owned life insurance, fair value		670,739	663,203
Financial liabilities
Brokered CDs and other time deposits		2,909,759	2,815,401
Brokered CDs and other time deposits, fair value		2,910,112	2,815,401
Short-term funding		108,444	157,074
Short-term funding, fair value		108,444	157,074
Other long-term funding		796,799	795,611
Long-term funding, fair value		842,196	826,612
FHLB advances		2,877,727	3,574,371
Advances, Fair Value Disclosure		2,938,923	3,565,572
Standby letters of credit		2,715	2,482
Standby letters of credit, fair value		2,715	2,482
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset		129,044	89,052
Derivatives (trading and other assets), fair value		129,044	89,052
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)		45,180	87,817
Derivatives (trading and other liabilities), fair value		45,180	87,817
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount		13,444	0
Investment securities gains (losses), net		13,444	0
Loans, net		22,540,285	22,702,406
Loans, net, fair value		22,422,568	22,317,395
Derivative Asset		2,017	2,208
Derivatives (trading and other assets), fair value		2,017	2,208
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts		21,512,804	22,081,992
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value		21,512,804	22,081,992
Derivatives (trading liabilities)		590	2,072
Derivatives (trading and other liabilities), fair value		$ 590	$ 2,072
[1]	(a) As permitted by ASU 2019-04, which was adopted during the third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with a book value of $692 million from held to maturity to available for sale.

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals)	3 Months Ended	9 Months Ended
	Sep. 30, 2019shares	Sep. 30, 2019shares
Fair Value Measurements (Textuals) [Abstract]
Fair Value Inputs Closing Ratio		85.00%
Visa Restricted Stock Owned	77,000
Visa Class A Shares - Current Conversion from Class B	124,956	124,956

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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
RAP
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,598	$ 1,885	$ 5,448	$ 5,670
Interest cost	2,489	1,682	7,314	5,002
Expected return on plan assets	(6,099)	(4,777)	(18,249)	(14,287)
Amortization of prior service cost	(18)	(18)	(55)	(56)
Amortization of actuarial loss	230	549	360	1,474
Total net periodic pension cost	(1,800)	(680)	(5,183)	(2,197)
Bank Mutual Pension Plan
Net period benefit cost for the pension and postretirement plans
Interest cost		654		1,737
Expected return on plan assets		(1,220)		(2,812)
Total net periodic pension cost		(566)		(1,075)
Postretirement Plan
Net period benefit cost for the pension and postretirement plans
Interest cost	26	27	78	80
Amortization of prior service cost	(19)	(19)	(56)	(56)
Amortization of actuarial loss	(1)	2	(3)	6
Total net periodic pension cost	$ 6	$ 11	$ 19	$ 30

Retirement Plans (Details Textu

Retirement Plans (Details Textuals) (Details) - USD ($) $ in Millions	Jun. 14, 2019	Feb. 01, 2018	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer					$ 0
Bank Mutual Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 6	$ 31
RAP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 4
Bank Mutual
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effective Date of Acquisition		Feb. 1, 2018
Huntington National Bank
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effective Date of Acquisition	Jun. 14, 2019

Segment Reporting (Details)

Segment Reporting (Details) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Sep. 30, 2019USD ($)segment	Sep. 30, 2018USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment								3
Segment Income Statement Data Abstract
Net interest income		$ 206,365			$ 219,392			$ 635,532	$ 655,625
Net intersegment interest income (expense)		0			0			0	0
Segment net interest income		206,365			219,392			635,532	655,625
Noninterest income		100,850			88,300			287,890	271,522
Total revenue		307,216			307,692			923,422	927,146
Credit provision		2,000			(5,000)			16,000	(1,000)
Noninterest expense		200,930			204,413			590,380	628,636
Income (loss) before income taxes		104,286			108,279			317,042	299,510
Income tax expense (benefit)		20,947			22,349			62,356	54,932
Net income		83,339	$ 84,661	$ 86,686	85,929	$ 89,192	$ 69,456	254,686	244,578
Segment Balance Sheet Data
Allocated goodwill								1,176,230	1,168,922
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income		110,929			113,298			342,486	339,718
Net intersegment interest income (expense)		(17,318)			(13,018)			(60,000)	(36,151)
Segment net interest income		93,612			100,280			282,485	303,567
Noninterest income		13,452			12,280			39,215	39,156
Total revenue		107,063			112,560			321,700	342,723
Credit provision		12,912			11,232			39,713	32,955
Noninterest expense		39,172			41,828			117,982	122,853
Income (loss) before income taxes		54,979			59,500			164,005	186,914
Income tax expense (benefit)		9,670			12,098			30,536	36,978
Net income		45,309			47,402			133,469	149,937
Segment Balance Sheet Data
Allocated goodwill								525,836	524,525
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income		81,517			91,323			254,463	268,137
Net intersegment interest income (expense)		27,651			21,951			76,679	63,301
Segment net interest income		109,167			113,275			331,142	331,438
Noninterest income		81,133			73,838			233,692	224,124
Total revenue		190,300			187,113			564,834	555,562
Credit provision		5,008			5,280			15,007	15,125
Noninterest expense		137,761			139,627			406,984	405,129
Income (loss) before income taxes		47,532			42,206			142,843	135,307
Income tax expense (benefit)		9,982			8,863			30,003	28,415
Net income		37,550			33,343			112,839	106,893
Segment Balance Sheet Data
Allocated goodwill								650,394	644,397
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income		13,919			14,770			38,583	47,770
Net intersegment interest income (expense)		(10,333)			(8,933)			(16,679)	(27,150)
Segment net interest income		3,586			5,837			21,905	20,620
Noninterest income		6,265			2,183			14,983	8,242
Total revenue		9,852			8,019			36,888	28,861
Credit provision		(15,919)			(21,512)			(38,721)	(49,081)
Noninterest expense		23,981			22,959			65,399	100,654
Income (loss) before income taxes		1,790			6,572			10,209	(22,712)
Income tax expense (benefit)		1,295			1,388			1,816	(10,460)
Net income		$ 495			$ 5,185			8,393	(12,252)
Segment Balance Sheet Data
Allocated goodwill								0	0
Business Combinations, Acquisition Related Costs		approximately $2 million			approximately $2 million
Business Combination, Acquisition Related Costs	[1]	$ 1,629			$ 2,271			$ 5,995	$ 29,983
[1]	(c) Includes Bank Mutual, Huntington branch, and First Staunton acquisition related costs only.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (124,972)				$ (124,972)
Investment securities losses (gains), net							(13,861)	$ (3,938)
Personnel expense	$ (123,170)			$ (124,476)			(366,449)	(366,141)
Adjustment for adoption of ASU 2016-01						$ 84
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities	8			52			(279)	684
Total other comprehensive income (loss)	22,111	$ 44,311	21,597	(15,631)	$ (12,215)	(31,177)	88,020	(72,762)
Ending Balance	(36,953)						(36,953)
Investment Securities Available For Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(9,773)		(75,643)	(90,986)		(38,453)	(75,643)	(38,453)
Other comprehensive income (loss) before reclassifications	33,173			(21,345)			123,139	(82,099)
Investment securities losses (gains), net	(3,788)			(30)			(5,931)	1,985
Personnel expense	0			0			0	0
Other expense	0			0			0	0
Adjustment for adoption of ASU 2016-01								(84)
Adjustment for adoption of ASU 2018-02								(8,419)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities	(8)			(52)			279	(684)
Income tax (expense) benefit	(7,410)			5,456			(29,651)	20,796
Total other comprehensive income (loss)	21,967			(15,971)			87,836	(68,505)
Ending Balance	12,194	(9,773)		(106,958)	(90,986)		12,194	(106,958)
Defined Benefit Pension and Post Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(49,290)		(49,330)	(28,902)		(24,305)	(49,330)	(24,305)
Other comprehensive income (loss) before reclassifications	0			0			0	0
Investment securities losses (gains), net	0			0				0
Personnel expense	(36)			(37)			(111)	(112)
Other expense	229			551			357	1,480
Adjustment for adoption of ASU 2016-01								0
Adjustment for adoption of ASU 2018-02								(5,235)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities	0			0			0	0
Income tax (expense) benefit	(49)			(174)			(62)	(390)
Total other comprehensive income (loss)	144			340			184	(4,257)
Ending Balance	(49,146)	(49,290)		(28,562)	(28,902)		(49,146)	(28,562)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(59,063)		(124,972)	(119,888)		(62,758)	(124,972)	(62,758)
Other comprehensive income (loss) before reclassifications	33,173			(21,345)			123,139	(82,099)
Investment securities losses (gains), net	(3,788)			(30)			(5,931)	1,985
Personnel expense	(36)			(37)			(111)	(112)
Other expense	229			551			357	1,480
Adjustment for adoption of ASU 2016-01								(84)
Adjustment for adoption of ASU 2018-02								(13,654)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities	(8)			(52)			279	(684)
Income tax (expense) benefit	(7,458)			5,282			(29,713)	20,406
Total other comprehensive income (loss)	22,111	44,311	$ 21,597	(15,631)	(12,215)	$ (31,177)	88,020	(72,762)
Ending Balance	$ (36,953)	$ (59,063)		$ (135,520)	$ (119,888)		$ (36,953)	$ (135,520)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	$ 72,713	$ 72,718	$ 216,373	$ 218,270
Noninterest Income (out-of-scope of Topic 606)	28,137	15,583	71,517	53,252
Total noninterest income	100,850	88,300	287,890	271,522
Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	20,954	21,636	69,403	68,279
Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	21,015	21,224	61,885	62,198
Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	16,561	16,904	47,102	49,714
Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	10,501	9,826	29,973	29,454
Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	3,683	3,128	8,010	8,624
Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	4,326	4,109	10,291	12,625
Noninterest Income (out-of-scope of Topic 606)	9,125	8,171	28,924	26,531
Corporate and Commercial Specialty | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	3,182	3,669	9,765	11,680
Corporate and Commercial Specialty | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	336	353	1,001	1,014
Corporate and Commercial Specialty | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	809	88	(475)	(69)
Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	68,346	68,518	205,666	205,065
Noninterest Income (out-of-scope of Topic 606)	12,787	5,320	28,026	19,059
Community, Consumer, and Business | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	21,041	21,677	69,483	68,289
Community, Consumer, and Business | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	21,015	21,224	61,885	61,932
Community, Consumer, and Business | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	13,367	13,210	37,293	37,984
Community, Consumer, and Business | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	10,120	9,489	28,829	28,449
Community, Consumer, and Business | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	2,803	2,918	8,175	8,411
Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	41	91	417	580
Noninterest Income (out-of-scope of Topic 606)	6,224	2,092	14,567	7,662
Risk Management and Shared Services | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	(87)	(41)	(80)	(9)
Risk Management and Shared Services | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	0	0	0	267
Risk Management and Shared Services | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	12	25	44	50
Risk Management and Shared Services | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	45	(15)	143	(9)
Risk Management and Shared Services | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	71	122	310	282
Operating Segments [Member] | Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Total noninterest income	13,452	12,280	39,215	39,156
Operating Segments [Member] | Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Total noninterest income	81,133	73,838	233,692	224,124
Operating Segments [Member] | Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 6,265	$ 2,183	$ 14,983	$ 8,242

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating Lease Costs	$ 2,708	$ 8,502
Operating Lease Cash Flows	$ 2,968	$ 8,538

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating lease right-of-use asset	$ 48,127
Finance lease right-of-use asset	0
Operating lease liability	52,011
Finance lease liability	$ 0

Leases Operating Lease Informat

Leases Operating Lease Information (Details) $ in Thousands	Sep. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Lease payments	$ 60,693
Weighted-average lease term (in years)	7 years 4 months 24 days
Weighted-average discount rate	3.36%
Equipment
Lessee, Lease, Description [Line Items]
Lease payments	$ 66
Weighted-average lease term (in years)	1 year 29 days
Weighted-average discount rate	2.72%
Retail and corporate offices
Lessee, Lease, Description [Line Items]
Lease payments	$ 54,202
Weighted-average lease term (in years)	6 years 7 months 17 days
Weighted-average discount rate	3.36%
Land
Lessee, Lease, Description [Line Items]
Lease payments	$ 6,425
Weighted-average lease term (in years)	12 years 1 month 9 days
Weighted-average discount rate	3.34%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
Three Months Ending December 31, 2019	$ 4,070
2020	10,520
2021	9,828
2022	7,578
2023	5,450
Beyond 2023	23,248
Total lease payments	60,693
Less: interest	8,682
Present value of lease payments	$ 52,011

Leases (Details Textuals)

Leases (Details Textuals) $ in Millions	Sep. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Additional operating leases	$ 16
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	43 years
Additional operating lease terms	6 years