Associated Banc-Corp (ASB) 10-K 8 Feb 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-31343
Entity Registrant Name	ASSOCIATED BANC-CORP
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	39-1098068
Entity Address, Address Line One	433 Main Street
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	54301
City Area Code	920
Local Phone Number	491-7500
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,422,814,728
Entity Common Stock, Shares Outstanding		151,087,726
Documents Incorporated by Reference	Portions of the registrant's Proxy Statement for the Annual Meeting of Shareholders to be held on April 30, 2024 are incorporated by reference in this Form 10-K into Part III.
Entity Central Index Key	0000007789
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Auditor Location	Chicago, Illinois
Auditor Firm ID	185
Auditor Name	KPMG LLP
NEW YORK STOCK EXCHANGE, INC.
Entity Information [Line Items]
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	ASB
Security Exchange Name	NYSE
NEW YORK STOCK EXCHANGE, INC. | 2023 Subordinated Notes
Entity Information [Line Items]
Title of 12(b) Security	6.625% Fixed-Rate Reset Subordinated Notes due 2033
Trading Symbol	ASBA
Security Exchange Name	NYSE
Series E Preferred Stock | NEW YORK STOCK EXCHANGE, INC.
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
Series F Preferred Stock [Member] | NEW YORK STOCK EXCHANGE, INC.
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.625% Non-Cum. Perp Pref Stock, Srs F
Trading Symbol	ASB PrF
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and Due from Banks	$ 484,384	$ 436,952
Interest-bearing deposits in other financial institutions	425,089	156,693
Federal funds sold and securities purchased under agreements to resell	14,350	27,810
Debt Securities, Available-for-sale	3,600,892	2,742,025
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	3,860,160	3,960,398
Equity securities	41,651	25,216
FHLB and Federal Reserve Bank stocks, at cost	229,171	295,496
Residential loans held for sale	33,011	20,383
Commercial Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	90,303	0
Loans	29,216,218	28,799,569
Allowance for loan losses	(351,094)	(312,720)
Loans, net	28,865,124	28,486,849
Tax credit and other investments	258,067	276,773
Premises and equipment, net	372,978	376,906
Bank and corporate owned life insurance	682,649	676,530
Goodwill	1,104,992	1,104,992
Other intangible assets, net	40,471	49,282
Servicing Asset at Fair Value, Amount	84,390	77,351
Interest receivable	169,569	144,449
Other assets	658,604	547,621
Total assets	41,015,855	39,405,727
Liabilities and stockholders' equity
Noninterest-bearing demand deposits	6,119,956	7,760,811
Interest-bearing deposits	27,326,093	21,875,343
Total deposits	33,446,049	29,636,154
Federal funds purchased and securities sold under agreements to repurchase	326,780	585,139
Commercial paper	0	20,798
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,940,194	4,319,861
Other long-term funding	541,269	248,071
Allowance for unfunded commitments	34,776	38,776
Accrued expenses and other liabilities	552,814	541,438
Total liabilities	36,841,882	35,390,237
Stockholders’ equity
Preferred equity	194,112	194,112
Common stock	1,752	1,752
Surplus	1,714,822	1,712,733
Retained earnings	2,946,805	2,904,882
Accumulated other comprehensive (loss)	(171,096)	(272,799)
Treasury stock, at cost	(512,421)	(525,190)
Total common equity	3,979,861	3,821,378
Total stockholders’ equity	4,173,973	4,015,490
Total liabilities and stockholders’ equity	$ 41,015,855	$ 39,405,727
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	200,000	200,000
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Common shares issued	175,216,409	175,216,409
Common shares outstanding	151,036,674	150,444,019

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Stockholders’ equity
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		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income
Interest and fees on loans		$ 1,720,406	$ 992,642	$ 693,729
Interest and dividends on investment securities
Taxable		146,006	75,444	37,916
Tax-exempt		63,233	65,691	58,710
Other interest		28,408	11,475	7,833
Total interest income		1,958,052	1,145,252	798,189
Interest expense
Interest on deposits		673,624	98,309	18,622
Interest on federal funds purchased and securities sold under agreements to repurchase		12,238	3,480	143
Interest on other short-term funding		1	2	22
Interest on FHLB advances		196,535	75,487	36,493
Interest on long-term funding		36,080	10,653	17,053
Total interest expense		918,479	187,931	72,334
Net interest income		1,039,573	957,321	725,855
Provision for credit losses		83,021	32,998	(88,011)
Net interest income after provision for credit losses		956,552	924,323	813,866
Noninterest income
Noninterest Income In Scope of Topic 606		186,560	201,953	212,278
Capital markets, net		24,649	29,917	30,602
Mortgage banking, net		19,429	18,873	50,751
Gain (Loss) on Sale of Mortgage Loans		(136,239)	0	0
Bank Owned Life Insurance Income		10,266	11,431	13,254
Asset gains, net	[1]	454	1,338	11,009
Investment securities (losses) gains, net		(58,903)	3,746	(16)
Gains on sale of branches, net(a)		0	0	1,038
Other		9,691	10,715	11,366
Total noninterest income		63,182	282,370	332,364
Noninterest expense
Personnel		468,355	454,101	426,687
Technology		102,018	90,700	81,689
Occupancy		57,204	59,794	63,513
Business development and advertising		28,405	25,525	21,149
Equipment		19,663	19,632	21,104
Legal and professional		19,911	18,250	21,923
Loan and foreclosure costs		5,408	5,925	8,143
FDIC assessment		67,072	22,650	18,150
Other intangible amortization		8,811	8,811	8,844
Other		36,837	41,675	38,721
Total noninterest expense		813,682	747,063	709,924
Income before income tax expense		206,052	459,630	436,307
Income tax expense		23,097	93,508	85,313
Net income		182,956	366,122	350,994
Preferred stock dividends		11,500	11,500	17,111
Net income available to common equity		$ 171,456	$ 354,622	$ 333,883
Earnings per common share
Basic		$ 1.14	$ 2.36	$ 2.20
Diluted		$ 1.13	$ 2.34	$ 2.18
Average common shares outstanding
Basic		149,968	149,162	150,773
Diluted		150,860	150,496	151,987
Wealth management fees
Noninterest income
Noninterest Income In Scope of Topic 606	[2]	$ 82,502	$ 84,122	$ 89,854
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606		49,045	62,310	64,406
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606		45,121	44,132	43,124
Revenue from Contract with Customer, Including Assessed Tax		45,020	44,014	43,014
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606		9,891	11,389	14,894
Revenue from Contract with Customer, Including Assessed Tax		$ 17,268	$ 15,903	$ 17,086
[1]Includes the deposit premium on the sale of branches net of miscellaneous costs to sell. See Note 2 Acquisitions and Dispositions for additional details on the branch sales.[2](a)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 182,956	$ 366,122	$ 350,994
AFS investment securities
Net unrealized gains (losses)	41,145	(250,273)	(63,714)
Unrealized (losses) on AFS securities transferred to HTM securities	0	(67,604)	0
Amortization of net unrealized losses on AFS securities transferred to HTM securities	9,025	9,870	1,551
Reclassification adjustment for net losses realized in net income	64,940	1,922	16
Income tax (expense) benefit	(30,560)	78,159	15,557
Other comprehensive income (loss) on AFS investment securities	84,550	(227,926)	(46,591)
Fair value adjustment on cash flow hedges	(13,254)	3,626	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	13,930	(212)	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(956)	(54)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(280)	3,360	0
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(326)	(325)	(148)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0	1,494
Net actuarial gain (loss)	24,091	(51,745)	25,519
Amortization of actuarial loss (gain)	(29)	658	4,594
Income tax (expense) benefit	(6,304)	13,495	(7,803)
Other comprehensive income (loss) on defined benefit pension and postretirement obligations	17,432	(37,917)	23,656
Other Comprehensive Income (Loss), Net of Tax	101,703	(262,483)	(22,935)
Comprehensive income	$ 284,659	$ 103,639	$ 328,059

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Performance/Service Based RSAs, RSA, [Member]	Board Authorized Purchase Program [Member]	Series C Preferred Stock	Series D Preferred Stock	Series E Preferred Stock	Series F Preferred Stock [Member]	Preferred Equity	Common Stock [Member]	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Treasury Stock Performance/Service Based RSAs, RSA, [Member]	Treasury Stock Board Authorized Purchase Program [Member]
Beginning balance at Dec. 31, 2020		$ 4,090,933							$ 353,512	$ 1,752	$ 1,720,329	$ 2,458,920	$ 12,618	$ (456,198)
Preferred stock shares outstanding, beginning balance (in shares) at Dec. 31, 2020									364,000
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2020										175,216,000
Comprehensive income:
Net income		350,994										350,994
Other Comprehensive Income, Other, Net of Tax		(22,935)											(22,935)
Other comprehensive (loss)		(22,935)											(22,935)
Comprehensive income		328,059
Purchase of preferred stock		(164,458)							$ (160,317)			(4,141)
Common stock issued:
Stock-based compensation plans, net		25,702									(22,069)	0		47,771
Purchase of Treasury Stock			$ (4,847)	$ (132,955)											$ (4,847)	$ (132,955)
Cash dividends
Common stock dividends		(116,061)										(116,061)
Preferred stock dividends		(17,111)										(17,111)
Stock-based compensation expense, net		15,591									15,591
Other														0
Ending balance at Dec. 31, 2021		4,024,853							$ 193,195	$ 1,752	1,713,851	2,672,601	(10,317)	(546,229)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2021									200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2021										175,216,000
Cash dividends
Purchase of preferred stock									(164,000)
Preferred Stock, Dividends, Per Share, Cash Paid					$ 0.70252	$ 0.95613	$ 1.46875	$ 1.40625
Net income		366,122										366,122
Other comprehensive (loss)		(262,483)											(262,483)
Comprehensive income		103,639
Stock-based compensation plans, net		11,061									(17,397)			28,458
Purchase of Treasury Stock			(6,480)												(6,480)
Common stock dividends		(123,137)										(123,137)
Preferred stock dividends	[1]	(11,500)										(11,500)
Stock-based compensation expense, net		16,280									16,280
Other		(938)							$ 916			(916)		(938)
Ending balance at Dec. 31, 2022		4,015,490							194,112	$ 1,752	1,712,733	2,904,882	(272,799)	(525,190)
Ending balance (Cumulative Effect, Period of Adoption, Adjustment [Member]) at Dec. 31, 2022		1,713										1,713
Ending balance (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2022		$ 4,026,566							$ 193,195	$ 1,752	1,713,851	2,674,314	(10,317)	(546,229)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2022									200,000
Preferred stock shares outstanding, ending balance (in shares) (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2022									200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2022		150,444,019								175,216,000
Common stock shares outstanding, ending balance (in shares) (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2022										175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid							1.46875	1.40625
Net income		$ 182,956										182,956
Other comprehensive (loss)		101,703											101,703
Comprehensive income		284,659
Stock-based compensation plans, net		4,297									(15,065)			19,362
Purchase of Treasury Stock			$ (6,593)												$ (6,593)
Common stock dividends		(129,534)										(129,534)
Preferred stock dividends	[2]	(11,500)										(11,500)
Stock-based compensation expense, net		17,155									17,155
Other														0
Ending balance at Dec. 31, 2023		$ 4,173,973							$ 194,112	$ 1,752	$ 1,714,822	$ 2,946,805	$ (171,096)	$ (512,421)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2023									200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2023		151,036,674								175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid							$ 1.46875	$ 1.40625
[1] (a) Series C, $0.70252 per share; Series D, $0.95613 per share; Series E, $1.46875 per share; and Series F, $1.40625 per share. (b) MSRs at December 31, 2021 were carried at LOCOM. On January 1, 2022, the Corporation made the irrevocable election to account for MSRs at fair value. (c) Series E, $1.46875 per share; and Series F, $1.40625 per share.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)
Cash Flows from Operating Activities
Net income	$ 182,956		$ 366,122		$ 350,994
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	83,021		32,998		(88,011)
Depreciation and amortization	46,989		45,088		46,508
Change in MSRs valuation(a)	(10,660)		(22,264)		(16,186)
Amortization of other intangible assets	8,811		8,811		8,844
Amortization and accretion on earning assets, funding, and other, net	38,508		14,980		15,088
Net amortization of tax credit investments	34,246		34,684		34,070
Losses on sales of investment securities, net	64,864		1,674		16
Asset (gains), net	(454)	[1]	(1,338)	[1]	(11,009)	[1]
(Gains) on sale of branches, net	0		0		(1,038)
(Gain) loss on mortgage banking activities, net	(2,919)		(3,654)		39,106
Gain (Loss) on Sale of Mortgage Loans	136,239		0		0
Mortgage loans originated and acquired for sale	(395,834)		(600,114)		(1,749,556)
Proceeds from sales of mortgage loans held for sale	367,707		715,035		1,774,791
(Increase) decrease in interest receivable	(25,120)		(63,921)		9,735
(Increase) decrease in net tax position	(77,849)		40,611		(6,177)
(Decrease) increase in interest payable	78,539		12,608		(10,675)
(Decrease) increase in expense payable	16,329		(5,297)		24,645
(Decrease) increase in net derivative position	(93,916)		269,774		120,418
Net change in other assets and other liabilities	(14,556)		(6,539)		66,201
Net cash provided by operating activities	442,740		846,566		529,551
Cash flows from investing activities
Net decrease (increase) in loans	(1,546,391)		(4,579,431)		198,631
Purchases of:
AFS securities	(1,936,635)		(959,977)		(2,744,244)
HTM securities	(38,677)		(301,052)		(622,485)
FHLB and Federal Reserve Bank stocks and equity securities	(146,308)		(128,620)		(2,760)
Proceeds from:
Proceeds from Sale of Debt Securities, Available-for-sale	715,066		110,177		158,708
Sales of FHLB and Federal Reserve Bank stocks and equity securities	202,451		528		35
Prepayments, calls, and maturities of AFS securities	397,675		494,197		1,216,657
Prepayments, calls, and maturities of HTM securities	143,001		196,605		299,761
Sales, prepayments, calls and maturities of other assets	21,267		33,795		29,833
Proceeds from Sale of Mortgage Portfolio	844,362		0		0
Premises, equipment, and software, net of disposals	(61,813)		(62,711)		(52,281)
Net change in tax credit and alternative investments	(30,255)		(58,323)		(68,455)
Net cash (used in) investing activities	(1,436,257)		(5,254,811)		(1,584,186)
Cash flows from financing activities
Net increase in deposits	3,809,948		1,169,983		2,015,423
Net decrease in deposits due to branch sales	0		0		(31,083)
Net increase (decrease) in short-term funding	(279,157)		251,674		101,946
Net increase (decrease) in short-term FHLB advances	(2,385,000)		3,125,000		0
Repayment of long-term FHLB advances	(599)		(413,558)		(18,437)
Proceeds from long-term FHLB advances	1,369		1,775		6,950
Proceeds from Issuance of Long-term Debt	292,740		0		0
(Repayment) proceeds of finance lease principal	(86)		306		(965)
Repayment of senior notes	0		0		(300,000)
Proceeds from issuance of common stock for stock-based compensation plans	4,297		11,061		25,702
Redemption of preferred shares	0		0		(164,458)
Cash dividends on common stock	(129,534)		(123,137)		(116,061)
Cash dividends on preferred stock	(11,500)		(11,500)		(17,111)
payments for repurchase of common stock for tax withholding	0		938		0
Net cash provided by financing activities	1,295,885		4,004,185		1,364,102
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	302,368		(404,060)		309,467
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	621,455		1,025,515		716,048
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	923,823		621,455		1,025,515
Restricted Cash	0		0		0
Supplemental disclosures of cash flow information
Cash paid for interest	838,828		174,675		81,604
Cash paid for income and franchise taxes	69,417		18,395		57,728
Loans and bank premises transferred to OREO	9,841		5,591		35,553
Capitalized mortgage servicing rights	3,564		7,279		16,151
Loans transferred into held for sale from portfolio, net	1,058,305		18		6,010
Transfer of AFS securities to HTM securities	0		1,621,990		0
Unsettled trades to purchase securities	0		0		4,459
Write-up of equity securities without readily determinable fair values	5,785		5,690		0
Fair value adjustment on cash flow hedges	(13,254)		3,626		0
Other Assets [Member]
Supplemental disclosures of cash flow information
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(1,757)		1,405		482
Liability
Supplemental disclosures of cash flow information
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(5,084)		16,163		0
Fair Value, Measurements, Recurring [Member]
Supplemental disclosures of cash flow information
Fair value adjustment on cash flow hedges	(280)		3,360		0
ABRC [Member]
Proceeds from:
Net cash received in business segment sale	0		0		2,415
Performance/Service Based RSAs, RSA, [Member]
Cash flows from financing activities
Payments for Repurchase of Common Stock	6,593		6,480		4,847
Board Authorized Purchase Program [Member]
Cash flows from financing activities
Payments for Repurchase of Common Stock	$ 0		$ 0		$ 132,955
[1]Includes the deposit premium on the sale of branches net of miscellaneous costs to sell. See Note 2 Acquisitions and Dispositions for additional details on the branch sales.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Standards Update and Change in Accounting Principle [Text Block]	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. The following is a description of the more significant of those policies. Business Associated Banc-Corp is a bank holding company headquartered in Wisconsin. The Corporation provides a full range of banking and related financial services to consumer and commercial customers through its network of bank and nonbank subsidiaries. The Corporation is subject to competition from other financial and non-financial institutions that offer similar or competing products and services. The Corporation is regulated by federal and state agencies and is subject to periodic examinations by those agencies. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Parent Company and its subsidiaries. Investments in unconsolidated entities (none of which are considered to be variable interest entities in which the Corporation is the primary beneficiary) are accounted for using the cost method of accounting when the Corporation has determined that the cost method is appropriate. Investments not meeting the criteria for cost method accounting are accounted for using the equity method of accounting. Investments in unconsolidated entities are included in tax credit and other investments on the consolidated balance sheets, and the Corporation’s share of income or loss is recorded in other noninterest income, while distributions in excess of the investment are recorded in asset gains, net. All significant intercompany balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. The determination of the ACLL is particularly susceptible to significant change. 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. Investment Securities Securities are classified as HTM, AFS, or equity investments on the consolidated balance sheets at the time of purchase. Investment securities classified as HTM, which management has the positive intent and ability to hold to maturity, are reported at amortized cost. Investment securities classified as AFS are intended to be held for an indefinite period of time. These securities are carried at fair value and unrealized gains and losses, net of related deferred income taxes, are included in stockholders' equity as a separate component of OCI. Investment securities classified as equity securities are carried at fair value with changes in fair value immediately reflected in the consolidated statements of income. Any decision to sell AFS securities would be based on various factors, including, but not limited to, asset/liability management strategies, changes in interest rates or prepayment risks, liquidity needs, or regulatory capital considerations. Realized gains or losses on investment security sales (using specific identification method) are included in investment securities gains (losses), net, on the consolidated statements of income. Premiums and discounts are amortized or accreted into interest income over the estimated life (earlier of call date, maturity, or estimated life) of the related security, using a prospective method that approximates level yield. In certain situations, management may elect to transfer certain investment securities from the AFS classification to the HTM classification. In such cases, the investment securities are reclassified at fair value at the time of transfer. Any unrealized gain or loss included in accumulated other comprehensive income (loss) at the time of transfer is retained therein and amortized over the remaining life of the investment security as an adjustment to yield. Management measures expected credit losses on HTM securities on a collective basis by major security type. Accrued interest receivable on HTM securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts and is included in HTM investment securities, net, at amortized cost on the consolidated balance sheets. For AFS securities, the Corporation evaluates whether any decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses on investments is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses on investments is recognized in OCI. Changes in the allowance for credit losses on investments are recorded as provision for, or reversal of, credit loss expense. Losses are charged against the allowance when management believes the AFS security is uncollectible or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on AFS securities is excluded from the estimate of credit losses. See Note 3 for additional information on investment securities. 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. See Note 3 for additional information on the FHLB and Federal Reserve Bank Stocks. Loans Held for Sale 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 on 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. Commercial Loans Held for Sale: Commercial loans held for sale are carried at LOCOM. The estimated fair value is based on a discounted cash flow analysis. Loans Management has the ability and intention to hold certain loans for the foreseeable future, until maturity, or pay-off. These loans are reported at their outstanding principal balances, net of any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the effective interest method. An ACLL is established for estimated credit losses in the loan portfolio. See Allowance for Credit Losses on Loans below for further policy discussion. See Note 4 for additional information on loans. Nonaccrual Loans: Management considers a loan to be nonaccrual when it believes it will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. The accrual of interest income for commercial loans is discontinued when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due. The accrual of interest income for consumer loans is discontinued when loans reach specific delinquency levels. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on a nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal. The determination as to the ultimate collectability of the loan's remaining recorded investment must be supported by a current, well documented credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months. See Note 4 for additional information on nonaccrual loans. Troubled Debt Restructurings (“Restructured Loans”) : Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. As a result of the issuance of ASU 2022-02, any loans restructured prior to January 2023 were considered TDRs, but that designation was eliminated prospectively, resulting in comparable periods no longer being comparable. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. See Note 4 for additional information on restructured loans. Allowance for Credit Losses on Loans: The allowance for loan losses is a reserve for estimated lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimate of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flow of these loans. Actual credit losses, net of recoveries, are deducted from the allowance for loan losses. A provision for credit losses, which is a charge against earnings, is recorded to bring the allowance for loan losses to a level that, in management’s judgment, is appropriate to absorb the expected lifetime losses in the loan portfolio. The Corporation applies a methodology that is designed to assess the appropriateness of the allowance for loan losses within the Corporation's loan segmentation. The methodology also focuses on the evaluation of several factors, including but not limited to: evaluation of facts and issues related to specific loans, management’s ongoing review and grading of the loan portfolio using a dual risk rating system consisting of probability of default and loss given default models, which are based on loan grades for commercial loans and credit reports for consumer loans applied based on portfolio segmentation leveraging industry breakouts in commercial and industrial and property types in CRE for commercial loans and loan types for consumer loans, consideration of historical loan loss and delinquency experience on each portfolio category, trends in past due and nonaccrual loans, the level of potential problem loans, the risk characteristics of the various classifications of loans, changes in the size and character of the loan portfolio, concentrations of loans to specific borrowers or industries, existing economic conditions and economic forecasts, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect potential credit losses. The Corporation utilizes the Moody's Baseline economic forecast in the allowance model and applies that forecast over a reasonable and supportable period with reversion to historical losses. For additional detail on the reasonable and supportable period and reversion inputs, see Note 4. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flows of the loan. Because each of the criteria used is subject to change, the analysis of the allowance for loan losses is not necessarily indicative of the trend of future loan losses in any particular loan category. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio. Management individually analyzes loans that do not share similar risk characteristics to other loans in the portfolio. Management has determined that commercial loan relationships over $500,000 that have nonaccrual status meet this definition. Probable TDRs are loans the Corporation has reviewed individually to determine whether there is a high likelihood that the loans will default and will require modification in the near future. Probable TDRs are classified as Pass, Special Mention, Potential Problem or Nonaccrual within the Corporation's credit quality analysis depending on the specific circumstances surrounding the individual credits. Accrued interest receivable on loans is excluded from the estimate of credit losses. The ACLL attributable to the loan is allocated based on management’s estimate of the borrower’s ability to repay the loan given the availability of collateral, other sources of cash flows, as well as evaluation of legal options available to the Corporation. The amount of expected loan loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the fair value of the underlying collateral less applicable selling costs, or the observable market price of the loan. If foreclosure is probable or the loan is collateral dependent, impairment is measured using the fair value of the loan’s collateral, less costs to sell. Large groups of homogeneous loans, such as residential mortgage, home equity, auto finance, and other consumer, are collectively evaluated for impairment. The allowance for unfunded commitments leverages the same methodology utilized to measure the allowance for loan losses. The Corporation estimates expected credit losses over the contractual period in which the Corporation is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Corporation. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. See Note 4 for additional information on the ACLL and Note 16 for additional information on the allowance for unfunded commitments. A portion of the ACLL is comprised of adjustments for qualitative factors not reflected in the quantitative model. Management believes that the level of the ACLL is appropriate. While management uses currently available information to recognize losses on loans, future adjustments to the ACLL may be necessary based on newly received appraisals, updated commercial customer financial statements, rapidly deteriorating cash flow, and changes in economic conditions that affect our customers. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Corporation’s ACLL. Such agencies may require additions to the ACLL or may require that certain loan balances be charged off or downgraded into criticized loan categories when their credit evaluations differ from those of management based on their judgments about information available to them at the time of their examinations. See Loans above for further policy discussion and see Note 4 for additional information on the allowance for loan losses. OREO OREO is included in other assets on the consolidated balance sheets and is comprised of property acquired through a foreclosure proceeding or acceptance of a deed-in-lieu of foreclosure, and loans classified as in-substance foreclosure. OREO is recorded at the lower of the book value or fair value of the underlying property collateral, less estimated selling costs. This fair value becomes the new cost basis for the foreclosed asset. The initial write-down, if any, will be recorded as a charge off against the allowance for loan losses. Any subsequent write-downs to reflect current fair value, as well as gains and losses on disposition and revenues and expenses incurred in maintaining such properties, are expensed as incurred. OREO also includes bank premises formerly but no longer used for banking, property originally acquired for future expansion but no longer intended to be used for that purpose, and property currently held for sale. Banking premises are transferred at the lower of carrying value or fair value, less estimated selling costs and any write-down is expensed as incurred. Premises and Equipment and Software Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed on the straight-line method over the estimated useful lives of the related assets or the lease term. Maintenance and repairs are charged to expense as incurred, while additions or major improvements are capitalized and depreciated over the estimated useful lives. Leasehold improvements are amortized on a straight-line basis over the lesser of the lease terms, including extension options which the Corporation has determined are reasonably certain to be exercised, or the estimated useful lives of the improvements. Software, included in other assets on the consolidated balance sheets, is amortized on a straight-line basis over the contract terms or the estimated useful life of the software. See Note 6 for additional information on premises and equipment. Goodwill and Intangible Assets Goodwill and Other Intangible Assets: The excess of the cost of an acquisition over the fair value of the net assets acquired consists primarily of goodwill and CDIs. CDIs have estimated finite lives and are amortized on a straight-line basis to expense over a 10-year period. The Corporation reviews long-lived assets and certain identifiable intangibles for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, in which case an impairment charge would be recorded. Goodwill is evaluated for impairment on an annual basis, or whenever events or changes in circumstances indicate the fair value of a reporting unit is below its carrying amount. The impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired. If the carrying value of a reporting unit exceeds its calculated fair value, an impairment charge is assessed, limited to the amount of goodwill allocated to that reporting unit. See Note 5 for additional information on goodwill and other intangible assets. Mortgage Servicing Rights : The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Upon sale of loans, MSRs assets are capitalized and recorded at the current fair value of future net cash flows expected to be realized for performing servicing activities. The Corporation has made the irrevocable election to account for its MSRs asset under the fair value measurement method. Under this methodology, changes in the fair value are recognized in earnings as they occur through mortgage banking, net on the consolidated statements of income. MSRs are not traded in active markets. A cash flow model is used to determine fair value. Key assumptions and estimates, including projected prepayment speeds, assumed servicing costs, ancillary income, costs to service delinquent loans, costs of foreclosure, and discount rates with option-adjusted spreads, used by this model are based on current market sources. Assumptions used to value MSRs are considered significant unobservable inputs. A separate third-party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults and other relevant factors. Fair value estimates from outside sources are received periodically to corroborate the results of the valuation model. See Note 5 for additional information on MSRs. Prior to January 1, 2022 and the irrevocable election to account for MSRs under fair value, upon sale of loans, MSRs assets were capitalized and recorded at the current fair value of future net cash flows expected to be realized for performing servicing activities. MSRs, when purchased, are initially recorded at fair value. As the Corporation had not elected to subsequently measure any class of servicing assets under the fair value measurement method, the Corporation followed the amortization method. MSRs were amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date. MSRs were carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value, on the consolidated balance sheets. The Corporation periodically evaluated its MSRs asset for impairment. Impairment was 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 MSRs asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the MSRs asset generally increases, requiring less valuation reserve. A valuation allowance was established, through a charge to earnings, to the extent the amortized cost of the MSRs exceeded the estimated fair value by stratification. If it was later determined that all or a portion of the temporary impairment no longer existed for a stratification, the valuation was reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability was considered remote when considering interest rates and loan pay off activity) was recognized as a write-down of the MSRs asset and the related valuation allowance (to the extent a valuation allowance was available) and then against earnings. A direct write-down permanently reduces the carrying value of the MSRs asset and valuation allowance, precluding subsequent recoveries. See Note 5 for additional information on MSRs. Income Taxes Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes, which arise principally from temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities, are included in the amounts provided for income taxes. In assessing the realizability of DTAs, management considers whether it is more likely than not that some portion or all of the DTAs will not be realized. The ultimate realization of DTAs is dependent upon the generation of future taxable income and tax planning strategies which will create taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, the amount of taxes paid in available carryback years, projected future taxable income, and, if necessary, tax planning strategies in making this assessment. The Corporation files a consolidated federal income tax return and separate or combined state income tax returns. Accordingly, amounts equal to tax benefits of those subsidiaries having taxable federal or state losses or credits are offset by other subsidiaries that incur federal or state tax liabilities. It is the Corporation’s policy to provide for uncertainty in income taxes as a part of income tax expense based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. To the extent the Corporation prevails in matters for which a liability for an unrecognized tax benefit was established or is required to pay amounts in excess of the liability established, the Corporation’s effective tax rate in a given financial statement period may be impacted. See Note 13 for additional information on income taxes. Derivative and Hedging Activities Derivative instruments, including derivative instruments embedded in other contracts, are carried at fair value on the consolidated balance sheets. Changes in the fair value are 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. For a derivative designated as a cash flow hedge, 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 capital markets, net on the consolidated statements of income. The free-standing derivative instruments included: interest rate risk management, foreign currency exchange solutions, and until early 2022, commodity hedging. The Corporation is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts fail to fulfill contractual obligations. If a counterparty fails to perform, the Corporation's 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 and investment securities. Federal regulations require the Corporation to clear and compound SOFR 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 and the London Clearing House 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. The Corporation applied the shortcut method of accounting for certain derivatives that are designated as fair value hedges. This method permits the assumption of perfect effectiveness. The gains or losses on the derivative, and the offsetting losses or gains on the hedged item attributable to the hedged risk, are recognized in interest expense. These items, along with the net interest from the derivative, are reported in the same income statement line as the fixed-rate debt expense. To assess effectiveness of the foreign currency exchange forward contracts that are designated as fair value hedges, the Corporation has elected to utilize the critical terms match method. Under the critical terms match method, if the hedging relationship meets certain criteria, it allows the Corporation to assume that the hedging relationship is perfectly effective, eliminating the quantitative aspect of assessing effectiveness. 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 capital markets, net. To assess effectiveness of interest rate swaps that are designated as cash flow hedges, the Corporation performs a quantitative analysis using a period by period regression method. When the relationship between the hedged item and hedging instrument is highly effective at achieving offsetting changes in cash flows attributable to the hedged risk, changes in the fair value of these cash flow hedges are recorded in accumulated other comprehensive income (loss) and are subsequently reclassified to interest income as interest payments are made on such variable rate loans. See Note 14 for additional information on derivatives and hedging activ

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2023
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions: The Corporation did not have any business acquisitions during 2021, 2022 or 2023. Dispositions: The Corporation did not have any business dispositions during 2022 or 2023. 2021: On March 1, 2021, the Corporation completed the sale of its wealth management subsidiary, Whitnell, to Rockefeller for a purchase price of $8 million. The Corporation reported a first quarter 2021 pre-tax gain of $2 million, included in asset gains, net on the consolidated statements of income, in conjunction with the sale.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of AFS and HTM securities at December 31, 2023 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities U.S. Treasury securities $ 39,984 $ — $ (4,083) $ 35,902 Obligations of state and political subdivisions (municipal securities) 94,008 23 (2,214) 91,817 Residential mortgage-related securities: FNMA/FHLMC 1,274,052 294 (153,552) 1,120,794 GNMA 2,021,242 24,254 (2,822) 2,042,675 Commercial mortgage-related securities: FNMA/FHLMC 18,691 — (1,755) 16,937 GNMA 161,928 — (7,135) 154,793 Asset backed securities: FFELP 135,832 5 (1,862) 133,975 SBA 1,077 2 (28) 1,051 Other debt securities 3,000 — (50) 2,950 Total AFS investment securities $ 3,749,814 $ 24,579 $ (173,501) $ 3,600,892 HTM investment securities U.S. Treasury securities $ 999 $ — $ (36) $ 963 Obligations of state and political subdivisions (municipal securities) 1,682,473 5,638 (134,053) 1,554,059 Residential mortgage-related securities: FNMA/FHLMC 941,973 27,007 (164,587) 804,393 GNMA 48,979 92 (2,901) 46,170 Private-label 345,083 9,796 (65,372) 289,507 Commercial mortgage-related securities: FNMA/FHLMC 780,995 12,699 (160,781) 632,914 GNMA 59,733 386 (7,500) 52,619 Total HTM investment securities $ 3,860,235 $ 55,619 $ (535,230) $ 3,380,624 The amortized cost and fair values of AFS and HTM securities at December 31, 2022 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities U.S. Treasury securities $ 124,441 $ — $ (15,063) $ 109,378 Agency securities 15,000 — (1,468) 13,532 Obligations of state and political subdivisions (municipal securities) 235,693 96 (5,074) 230,714 Residential mortgage-related securities: FNMA/FHLMC 1,820,642 404 (216,436) 1,604,610 GNMA 502,537 314 (5,255) 497,596 Commercial mortgage-related securities: FNMA/FHLMC 19,038 — (1,896) 17,142 GNMA 115,031 — (4,569) 110,462 Asset backed securities: FFELP 157,138 — (5,947) 151,191 SBA 4,512 15 (51) 4,477 Other debt securities 3,000 — (78) 2,922 Total AFS investment securities $ 2,997,032 $ 830 $ (255,837) $ 2,742,025 HTM investment securities U.S. Treasury securities $ 999 $ — $ (62) $ 936 Obligations of state and political subdivisions (municipal securities) 1,732,351 1,994 (182,697) 1,551,647 Residential mortgage-related securities: FNMA/FHLMC 961,231 31,301 (175,760) 816,771 GNMA 52,979 85 (3,436) 49,628 Private-label 364,728 11,697 (72,920) 303,505 Commercial mortgage-related securities: FNMA/FHLMC 778,796 15,324 (178,281) 615,839 GNMA 69,369 577 (7,254) 62,691 Total HTM investment securities $ 3,960,451 $ 60,978 $ (620,411) $ 3,401,018 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 AFS and HTM securities at December 31, 2023, are shown below: AFS HTM ($ in thousands) Amortized Fair Amortized Fair Due in one year or less $ 2,395 $ 2,372 $ 6,099 $ 6,096 Due after one year through five years 42,606 38,464 52,391 52,328 Due after five years through ten years 64,728 62,839 157,279 153,795 Due after ten years 27,263 26,993 1,467,704 1,342,803 Total debt securities 136,992 130,669 1,683,472 1,555,022 Residential mortgage-related securities: FNMA/FHLMC 1,274,052 1,120,794 941,973 804,393 GNMA 2,021,242 2,042,675 48,979 46,170 Private-label — — 345,083 289,507 Commercial mortgage-related securities: FNMA/FHLMC 18,691 16,937 780,995 632,914 GNMA 161,928 154,793 59,733 52,619 Asset backed securities: FFELP 135,832 133,975 — — SBA 1,077 1,051 — — Total investment securities $ 3,749,814 $ 3,600,892 $ 3,860,235 $ 3,380,624 Ratio of fair value to amortized cost 96.0 % 87.6 % On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2023: ($ in thousands) AAA AA A Not Rated Total U.S. Treasury securities $ 999 $ — $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 760,329 915,303 5,687 1,155 1,682,473 Residential mortgage-related securities: FNMA/FHLMC 941,973 — — — 941,973 GNMA 48,979 — — — 48,979 Private-label 345,083 — — — 345,083 Commercial mortgage-related securities: FNMA/FHLMC 780,995 — — — 780,995 GNMA 59,733 — — — 59,733 Total HTM securities $ 2,938,090 $ 915,303 $ 5,687 $ 1,155 $ 3,860,235 The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2022: ($ in thousands) AAA AA A Not Rated Total U.S. Treasury securities $ 999 $ — $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 806,529 917,059 7,604 1,158 1,732,351 Residential mortgage-related securities: FNMA/FHLMC 961,231 — — — 961,231 GNMA 52,979 — — — 52,979 Private-label 364,728 — — — 364,728 Commercial mortgage-related securities: FNMA/FHLMC 778,796 — — — 778,796 GNMA 69,369 — — — 69,369 Total HTM securities $ 3,034,630 $ 917,059 $ 7,604 $ 1,158 $ 3,960,451 The following table summarizes gross realized gains and losses on AFS securities, the gain on sale and net write-up of equity securities, and proceeds from the sale of AFS investment securities for each of the three years ended December 31 shown below: ($ in thousands) 2023 2022 2021 Gross realized gains on AFS securities $ 83 $ 21 $ 421 Gross realized (losses) on AFS securities (65,022) (1,943) (437) Gain on sale and net write-up of equity securities 6,037 5,668 — Investment securities gains (losses), net $ (58,903) $ 3,746 $ (16) Proceeds from sales of AFS investment securities $ 715,066 $ 110,177 $ 158,708 During the fourth quarter of 2023, the Corporation sold lower yielding AFS securities with a carrying value of $715 million at a net loss of $65 million and reinvested the proceeds in higher yielding and lower risk-weighted GNMA securities. Additionally, during the fourth quarter of 2023, the Corporation sold 1,000 shares of its Visa Class B restricted shares and wrote up its remaining shares based on that market price, resulting in a gain of $6 million. During the fourth quarter of 2022, the Corporation sold $110 million of lower yielding municipal securities at a loss of $2 million and reinvested the proceeds into higher yielding and lower risk-weighted GNMA securities. During the third quarter of 2022, the Corporation sold its Visa Class B restricted shares obtained in the acquisition of First Staunton, which were carried at a zero-cost basis. The remaining shares of Visa Class B restricted shares held by the Corporation, which are carried at fair value, were subsequently written up to reflect the new observable price resulting from that sale. During the second quarter of 2021, the Corporation sold $107 million of lower yielding FFELP student loan asset backed securities at an immaterial gain and reinvested the proceeds into higher yielding MBS. During the first quarter of 2021, the Corporation sold $51 million of lower yielding U.S. Treasury and Agency securities at an immaterial loss to take advantage of the steeper yield curve by reinvesting the proceeds into similar but higher yielding, longer duration securities. Investment securities with a carrying value of $1.6 billion at December 31, 2023 and $2.3 billion at December 31, 2022 were pledged as required to secure certain deposits or for other purposes. Accrued interest receivable on HTM securities totaled $18 million and $19 million at December 31, 2023 and 2022, respectively. Accrued interest receivable on AFS securities totaled $15 million and $9 million at December 31, 2023 and 2022, respectively. Accrued interest receivable on both HTM and AFS securities is included in interest receivable on the consolidated balance sheets. There was no interest income reversed for investments going into nonaccrual for the years ended December 31, 2023 and 2022. A security is considered past due once it is 30 days past due under the terms of the agreement. At both December 31, 2023 and 2022, the Corporation had no past due HTM securities. The allowance for credit losses on HTM securities was approximately $75,000 and $54,000 at December 31, 2023 and 2022, respectively, attributable entirely to the Corporation's municipal securities, included in HTM investment securities, net, at amortized cost on the consolidated balance sheets. The Corporation also holds U.S. Treasury, municipal, and mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and private-label residential mortgage-related securities that have credit enhancement which covers the first 15% of losses and, as a result, no allowance for credit losses has been recorded related to these securities. The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2023: Less than 12 months 12 months or more Total ($ in thousands) Number Unrealized Fair Number Unrealized Fair Unrealized (Losses) Fair AFS investment securities U.S. Treasury securities — $ — $ — 1 $ (4,083) $ 35,902 $ (4,083) $ 35,902 Obligations of state and political subdivisions (municipal securities) 41 (347) 23,762 92 (1,867) 53,022 (2,214) 76,784 Residential mortgage-related securities: FNMA/FHLMC 18 (333) 22,870 71 (153,219) 1,080,337 (153,552) 1,103,207 GNMA 13 (924) 156,847 5 (1,898) 26,643 (2,822) 183,490 Commercial mortgage-related securities: FNMA/FHLMC — — — 1 (1,755) 16,937 (1,755) 16,937 GNMA 9 (3,160) 103,055 22 (3,975) 51,738 (7,135) 154,793 Asset backed securities: FFELP — — — 14 (1,862) 125,339 (1,862) 125,339 SBA — — — 5 (28) 761 (28) 761 Other debt securities 1 (9) 991 2 (42) 1,958 (50) 2,950 Total 82 $ (4,773) $ 307,527 213 $ (168,728) $ 1,392,635 $ (173,501) $ 1,700,162 HTM investment securities U.S. Treasury securities — $ — $ — 1 $ (36) $ 963 $ (36) $ 963 Obligations of state and political subdivisions (municipal securities) 182 (1,535) 180,270 537 (132,518) 792,940 (134,053) 973,210 Residential mortgage-related securities: FNMA/FHLMC 20 (511) 30,323 94 (164,076) 771,042 (164,587) 801,365 GNMA 2 (17) 2,128 78 (2,884) 34,626 (2,901) 36,754 Private-label — — — 18 (65,372) 289,507 (65,372) 289,507 Commercial mortgage-related securities: FNMA/FHLMC 1 (121) 8,144 44 (160,660) 624,770 (160,781) 632,914 GNMA — — — 13 (7,500) 52,619 (7,500) 52,619 Total 205 $ (2,184) $ 220,865 785 $ (533,046) $ 2,566,468 $ (535,230) $ 2,787,333 For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2022: Less than 12 months 12 months or more Total ($ in thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair AFS investment securities U.S. Treasury securities — $ — $ — 7 $ (15,063) $ 109,378 $ (15,063) $ 109,378 Agency securities — — — 1 (1,468) 13,532 (1,468) 13,532 Obligations of state and political subdivisions (municipal securities) 358 (5,066) 201,260 4 (8) 1,916 (5,074) 203,176 Residential mortgage-related securities: FNMA/FHLMC 24 (31,266) 260,986 84 (185,170) 1,321,420 (216,436) 1,582,406 GNMA 23 (4,415) 220,276 2 (840) 11,096 (5,255) 231,372 Commercial mortgage-related securities: FNMA/FHLMC 1 (1,896) 17,142 — — — (1,896) 17,142 GNMA 33 (3,920) 101,036 4 (649) 9,426 (4,569) 110,462 Asset backed securities: FFELP 3 (1,668) 44,304 12 (4,278) 106,887 (5,947) 151,191 SBA 2 (1) 417 6 (50) 2,057 (51) 2,474 Other debt securities 2 (30) 1,970 1 (49) 951 (78) 2,922 Total 446 $ (48,263) $ 847,391 121 $ (207,575) $ 1,576,665 $ (255,837) $ 2,424,055 HTM investment securities U.S. Treasury securities 1 $ (62) $ 936 — $ — $ — $ (62) $ 936 Obligations of state and political subdivisions (municipal securities) 771 (96,282) 1,079,216 156 (86,415) 231,022 (182,697) 1,310,238 Residential mortgage-related securities: FNMA/FHLMC 79 (18,925) 143,201 22 (156,836) 671,570 (175,760) 814,770 GNMA 81 (3,436) 44,476 — — — (3,436) 44,476 Private-label 3 (9,509) 58,733 15 (63,411) 244,772 (72,920) 303,505 Commercial mortgage-related securities: FNMA/FHLMC 4 (3,814) 20,338 39 (174,467) 576,911 (178,281) 597,249 GNMA 8 (2,528) 34,612 6 (4,726) 28,080 (7,254) 62,691 Total 947 $ (134,556) $ 1,381,511 238 $ (485,855) $ 1,752,354 $ (620,411) $ 3,133,865 The Corporation reviews the AFS investment securities portfolio on a quarterly basis to monitor its credit exposure. A determination as to whether a security’s decline in fair value is the result of credit risk takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in this impairment analysis include the extent to which the security has been in an unrealized loss position, the change in security rating, 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 losses at December 31, 2023 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. 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 bank 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. The Corporation had FHLB stock of $143 million and $209 million at December 31, 2023 and 2022, respectively. The Corporation had Federal Reserve Bank stock of $87 million at both December 31, 2023 and 2022. Accrued interest receivable on FHLB stock totaled $4 million and $3 million at December 31, 2023 and 2022, respectively. There was no accrued interest receivable on Federal Reserve Bank stock at both December 31, 2023 and December 31, 2022. Accrued interest receivable on both FHLB stock and Federal Reserve Bank stock is included in interest receivable on the consolidated balance sheets. 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 and other mutual funds. At December 31, 2023 and 2022, the Corporation had equity securities with readily determinable fair values of $7 million and $6 million, respectively. Equity securities without readily determinable fair values: The Corporation's portfolio of equity securities without readily determinable fair values, which primarily consists of Visa Class B restricted shares and an investment in a private SBA loan fund, was carried at $35 million and $19 million at December 31, 2023 and 2022, respectively.

Loans

Loans	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans The period end loan composition was as follows: ($ in thousands) Dec 31, 2023 Dec 31, 2022 Commercial and industrial $ 9,731,555 $ 9,759,454 Commercial real estate - owner occupied 1,061,700 991,722 Commercial and business lending 10,793,255 10,751,176 Commercial real estate - investor 5,124,245 5,080,344 Real estate construction 2,271,398 2,155,222 Commercial real estate lending 7,395,644 7,235,565 Total commercial 18,188,898 17,986,742 Residential mortgage 7,864,891 8,511,550 Auto finance 2,256,162 1,382,073 Home equity 628,526 624,353 Other consumer 277,740 294,851 Total consumer 11,027,319 10,812,828 Total loans $ 29,216,218 $ 28,799,569 Accrued interest receivable on loans totaled $132 million at December 31, 2023, and $113 million at December 31, 2022, and is included in interest receivable on the consolidated balance sheets. Interest accrued but not received is reversed against interest income when a loan is placed on nonaccrual. The amount of accrued interest reversed totaled $2 million for the year ended December 31, 2023, approximately $491,000 for the year ended December 31, 2022, and approximately $574,000 for the year ended December 31, 2021. The Corporation has granted loans to its directors, executive officers, or their related interests. These loans were made on substantially the same terms, including rates and collateral, as those prevailing at the time for comparable transactions with other unrelated customers, and do not involve more than a normal risk of collection. These loans to related parties are summarized below: ($ in thousands) 2023 2022 Balance at beginning of year $ 3,376 $ 45,245 New loans 2,564 2,656 Repayments (253) (1,416) Change due to status of executive officers and directors (280) (43,110) Balance at end of year $ 5,406 $ 3,376 The following table presents loans by credit quality indicator by origination year at December 31, 2023: Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2023 2022 2021 2020 2019 Prior Total Commercial and industrial: Risk rating: Pass $ 1,380 $ 1,693,629 $ 1,736,617 $ 2,877,173 $ 1,824,362 $ 398,046 $ 383,695 $ 449,006 $ 9,362,529 Special mention — 21,779 4,017 46,610 8,525 3,529 — 25,341 109,801 Potential problem 804 81,543 10,515 39,748 47,279 17,732 94 291 197,202 Nonaccrual 6,414 — 13,317 14,188 33,891 627 — — 62,022 Commercial and industrial $ 8,598 $ 1,796,951 $ 1,764,466 $ 2,977,719 $ 1,914,057 $ 419,934 $ 383,789 $ 474,638 $ 9,731,555 Commercial real estate - owner occupied: Risk rating: Pass $ — $ 15,393 $ 204,039 $ 188,003 $ 239,218 $ 136,535 $ 135,730 $ 92,339 $ 1,011,259 Special mention — 271 — — 6,150 2,635 — 1,293 10,349 Potential problem — 292 14,735 2,791 6,416 8,537 3,086 2,841 38,699 Nonaccrual — — 1,394 — — — — — 1,394 Commercial real estate - owner occupied $ — $ 15,957 $ 220,168 $ 190,794 $ 251,783 $ 147,708 $ 138,816 $ 96,473 $ 1,061,700 Commercial and business lending: Risk rating: Pass $ 1,380 $ 1,709,023 $ 1,940,657 $ 3,065,177 $ 2,063,580 $ 534,581 $ 519,426 $ 541,345 $ 10,373,788 Special mention — 22,050 4,017 46,610 14,675 6,164 — 26,634 120,150 Potential problem 804 81,836 25,250 42,539 53,695 26,269 3,180 3,132 235,900 Nonaccrual 6,414 — 14,710 14,188 33,891 627 — — 63,416 Commercial and business lending $ 8,598 $ 1,812,909 $ 1,984,635 $ 3,168,514 $ 2,165,840 $ 567,642 $ 522,606 $ 571,111 $ 10,793,255 Commercial real estate - investor: Risk rating: Pass $ — $ 155,109 $ 1,263,866 $ 1,266,866 $ 1,080,425 $ 471,371 $ 358,996 $ 239,230 $ 4,835,865 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Potential problem — — 106,002 50,152 15,000 983 — 24,025 196,163 Commercial real estate - investor $ — $ 155,611 $ 1,374,116 $ 1,342,492 $ 1,121,633 $ 472,355 $ 388,768 $ 269,269 $ 5,124,245 Real estate construction: Risk rating: Pass $ — $ 23,307 $ 422,277 $ 1,176,608 $ 547,825 $ 87,680 $ 5,740 $ 7,954 $ 2,271,392 Nonaccrual — — — — — — — 6 6 Real estate construction $ — $ 23,307 $ 422,277 $ 1,176,608 $ 547,825 $ 87,680 $ 5,740 $ 7,960 $ 2,271,398 Commercial real estate lending: Risk rating: Pass $ — $ 178,416 $ 1,686,143 $ 2,443,474 $ 1,628,250 $ 559,052 $ 364,737 $ 247,184 $ 7,107,256 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Potential problem — — 106,002 50,152 15,000 983 — 24,025 196,163 Nonaccrual — — — — — — — 6 6 Commercial real estate lending $ — $ 178,918 $ 1,796,393 $ 2,519,100 $ 1,669,458 $ 560,035 $ 394,508 $ 277,230 $ 7,395,644 Total commercial: Risk rating: Pass $ 1,380 $ 1,887,439 $ 3,626,800 $ 5,508,651 $ 3,691,830 $ 1,093,633 $ 884,162 $ 788,529 $ 17,481,044 Special mention — 22,552 8,265 72,084 40,882 6,164 29,772 32,648 212,368 Potential problem 804 81,836 131,253 92,691 68,695 27,253 3,180 27,157 432,063 Nonaccrual 6,414 — 14,710 14,188 33,891 627 — 6 63,422 Total commercial $ 8,598 $ 1,991,827 $ 3,781,028 $ 5,687,614 $ 3,835,298 $ 1,127,677 $ 917,114 $ 848,341 $ 18,188,898 Residential mortgage: Risk rating: Pass $ — $ — $ 352,321 $ 1,617,409 $ 2,110,577 $ 1,414,186 $ 647,778 $ 1,650,542 $ 7,792,813 Special mention — — — — — — 95 57 152 Potential problem — — 490 93 — — 174 26 784 Nonaccrual — — 1,425 9,567 9,259 10,397 6,628 33,865 71,142 Residential mortgage $ — $ — $ 354,236 $ 1,627,070 $ 2,119,836 $ 1,424,583 $ 654,675 $ 1,684,490 $ 7,864,891 Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2023 2022 2021 2020 2019 Prior Total Auto finance: Risk rating: Pass $ — $ — $ 1,218,820 $ 952,912 $ 75,209 $ 163 $ 456 $ 132 $ 2,247,691 Special mention — — 619 1,850 205 — — — 2,674 Nonaccrual — — 1,032 4,332 430 — 3 — 5,797 Auto finance $ — $ — $ 1,220,471 $ 959,094 $ 75,844 $ 163 $ 458 $ 132 $ 2,256,162 Home equity: Risk rating: Pass $ 8,703 $ 521,000 $ 1,678 $ 29,863 $ 6,084 $ 2,327 $ 4,891 $ 53,350 $ 619,192 Special mention 179 200 — 87 — 29 15 378 708 Potential problem 10 75 10 — — — 33 — 118 Nonaccrual 1,302 160 29 495 132 144 368 7,180 8,508 Home equity $ 10,195 $ 521,434 $ 1,717 $ 30,445 $ 6,217 $ 2,500 $ 5,308 $ 60,907 $ 628,526 Other consumer: Risk rating: Pass $ 121 $ 198,214 $ 6,419 $ 3,732 $ 2,658 $ 1,127 $ 460 $ 64,121 $ 276,731 Special mention 26 843 9 — 3 20 — 6 881 Nonaccrual 27 71 10 1 6 2 8 29 128 Other consumer $ 174 $ 199,129 $ 6,438 $ 3,733 $ 2,668 $ 1,149 $ 468 $ 64,156 $ 277,740 Total consumer: Risk rating: Pass $ 8,824 $ 719,213 $ 1,579,238 $ 2,603,916 $ 2,194,529 $ 1,417,802 $ 653,584 $ 1,768,145 $ 10,936,428 Special mention 205 1,043 628 1,936 208 49 110 441 4,416 Potential problem 10 75 500 93 — — 207 26 901 Nonaccrual 1,330 231 2,496 14,396 9,827 10,544 7,007 41,073 85,574 Total consumer $ 10,369 $ 720,563 $ 1,582,862 $ 2,620,341 $ 2,204,564 $ 1,428,395 $ 660,909 $ 1,809,685 $ 11,027,319 Total loans: Risk rating: Pass $ 10,204 $ 2,606,652 $ 5,206,038 $ 8,112,567 $ 5,886,359 $ 2,511,435 $ 1,537,747 $ 2,556,674 $ 28,417,472 Special mention 205 23,595 8,893 74,020 41,091 6,213 29,882 33,089 216,784 Potential problem 814 81,910 131,753 92,784 68,695 27,253 3,387 27,183 432,965 Nonaccrual 7,744 231 17,206 28,584 43,718 11,170 7,007 41,080 148,997 Total loans $ 18,966 $ 2,712,389 $ 5,363,890 $ 8,307,956 $ 6,039,862 $ 2,556,071 $ 1,578,023 $ 2,658,026 $ 29,216,218 (a) Revolving loans converted to term loans are those converted during the reporting period and are also reported in their year of origination. The following table presents loans by credit quality indicator by origination year at December 31, 2022: Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2022 2021 2020 2019 2018 Prior Total Commercial and industrial: Risk rating: Pass $ 1,423 $ 1,938,777 $ 3,245,546 $ 2,367,008 $ 567,833 $ 573,120 $ 330,642 $ 432,906 $ 9,455,833 Special mention — 93,209 3,411 23,607 — — 19 32,497 152,744 Potential problem 447 24,549 41,400 4,193 21,887 38,169 218 6,133 136,549 Nonaccrual 3,926 — 5,210 — 9,119 — — — 14,329 Commercial and industrial $ 5,796 $ 2,056,535 $ 3,295,567 $ 2,394,809 $ 598,839 $ 611,289 $ 330,879 $ 471,535 $ 9,759,454 Commercial real estate - owner occupied: Risk rating: Pass $ — $ 12,447 $ 211,645 $ 225,627 $ 163,965 $ 160,370 $ 73,487 $ 97,420 $ 944,961 Special mention — — — — 1,136 1,491 9,713 — 12,339 Potential problem — 1,325 1,238 11,141 5,523 10,769 370 4,055 34,422 Commercial real estate - owner occupied $ — $ 13,772 $ 212,883 $ 236,769 $ 170,624 $ 172,630 $ 83,570 $ 101,475 $ 991,722 Commercial and business lending: Risk rating: Pass $ 1,423 $ 1,951,224 $ 3,457,191 $ 2,592,636 $ 731,798 $ 733,490 $ 404,129 $ 530,326 $ 10,400,794 Special mention — 93,209 3,411 23,607 1,136 1,491 9,732 32,497 165,083 Potential problem 447 25,874 42,638 15,335 27,410 48,938 589 10,188 170,971 Nonaccrual 3,926 — 5,210 — 9,119 — — — 14,329 Commercial and business lending $ 5,796 $ 2,070,307 $ 3,508,450 $ 2,631,578 $ 769,463 $ 783,919 $ 414,449 $ 573,010 $ 10,751,176 Commercial real estate - investor: Risk rating: Pass $ 38,412 $ 106,280 $ 1,633,094 $ 1,419,000 $ 683,121 $ 530,444 $ 262,858 $ 210,299 $ 4,845,096 Special mention — — 61,968 24,149 7,361 9,400 — 10,455 113,333 Potential problem — — 16,147 21,303 27,635 1,333 19,017 7,099 92,535 Nonaccrual — — 2,177 25,668 — — — 1,535 29,380 Commercial real estate - investor $ 38,412 $ 106,280 $ 1,713,387 $ 1,490,120 $ 718,117 $ 541,177 $ 281,875 $ 229,387 $ 5,080,344 Real estate construction: Risk rating: Pass $ — $ 29,892 $ 900,593 $ 913,107 $ 241,230 $ 12,062 $ 2,226 $ 9,775 $ 2,108,885 Special mention — — — — 12,174 33,087 — — 45,261 Potential problem — — — — 970 — — — 970 Nonaccrual — — — — — — — 105 105 Real estate construction $ — $ 29,892 $ 900,593 $ 913,107 $ 254,374 $ 45,149 $ 2,226 $ 9,880 $ 2,155,222 Commercial real estate lending: Risk rating: Pass $ 38,412 $ 136,173 $ 2,533,687 $ 2,332,107 $ 924,351 $ 542,505 $ 265,083 $ 220,073 $ 6,953,981 Special mention — — 61,968 24,149 19,535 42,487 — 10,455 158,595 Potential problem — — 16,147 21,303 28,605 1,333 19,017 7,099 93,505 Nonaccrual — — 2,177 25,668 — — — 1,640 29,485 Commercial real estate lending $ 38,412 $ 136,173 $ 2,613,980 $ 2,403,227 $ 972,492 $ 586,326 $ 284,101 $ 239,267 $ 7,235,565 Total commercial: Risk rating: Pass $ 39,835 $ 2,087,396 $ 5,990,879 $ 4,924,743 $ 1,656,149 $ 1,275,996 $ 669,213 $ 750,399 $ 17,354,774 Special mention — 93,209 65,379 47,756 20,671 43,978 9,732 42,952 323,677 Potential problem 447 25,874 58,785 36,638 56,016 50,271 19,606 17,287 264,476 Nonaccrual 3,926 — 7,387 25,668 9,119 — — 1,640 43,814 Total commercial $ 44,208 $ 2,206,480 $ 6,122,430 $ 5,034,805 $ 1,741,955 $ 1,370,245 $ 698,550 $ 812,278 $ 17,986,742 Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2022 2021 2020 2019 2018 Prior Total Residential mortgage: Risk rating: Pass $ — $ — $ 1,410,566 $ 2,184,125 $ 1,716,663 $ 817,164 $ 370,724 $ 1,951,406 $ 8,450,648 Special mention — — — 284 96 — — 63 444 Potential problem — — 455 71 — 738 29 685 1,978 Nonaccrual — — 8,506 3,851 6,219 3,744 5,014 31,145 58,480 Residential mortgage $ — $ — $ 1,419,527 $ 2,188,332 $ 1,722,979 $ 821,645 $ 375,768 $ 1,983,299 $ 8,511,550 Auto finance: Risk rating: Pass $ — $ — $ 1,271,205 $ 106,102 $ 333 $ 1,267 $ 446 $ 61 $ 1,379,414 Special mention — — 1,052 118 — — — — 1,170 Nonaccrual — — 1,149 331 — 9 — — 1,490 Auto finance $ — $ — $ 1,273,406 $ 106,551 $ 333 $ 1,276 $ 446 $ 61 $ 1,382,073 Home equity: Risk rating: Pass $ 7,254 $ 508,212 $ 31,389 $ 6,508 $ 2,112 $ 6,197 $ 6,966 $ 54,827 $ 616,211 Special mention 47 102 — — — — 47 310 458 Potential problem — 15 — — — 34 2 146 197 Nonaccrual 1,590 — 306 102 131 307 319 6,322 7,487 Home equity $ 8,891 $ 508,329 $ 31,695 $ 6,610 $ 2,243 $ 6,538 $ 7,333 $ 61,605 $ 624,353 Other consumer: Risk rating: Pass $ 64 $ 199,942 $ 7,429 $ 5,256 $ 2,468 $ 1,238 $ 174 $ 77,611 $ 294,117 Special mention 6 490 11 — 5 5 — 25 537 Nonaccrual 78 56 11 21 10 56 10 34 197 Other consumer $ 147 $ 200,488 $ 7,452 $ 5,276 $ 2,482 $ 1,300 $ 184 $ 77,670 $ 294,851 Total consumer: Risk rating: Pass $ 7,318 $ 708,154 $ 2,720,589 $ 2,301,991 $ 1,721,576 $ 825,866 $ 378,310 $ 2,083,904 $ 10,740,390 Special mention 52 592 1,063 403 101 5 47 398 2,609 Potential problem — 15 455 71 — 772 31 831 2,175 Nonaccrual 1,668 56 9,973 4,304 6,360 4,116 5,343 37,501 67,654 Total consumer $ 9,038 $ 708,817 $ 2,732,080 $ 2,306,769 $ 1,728,037 $ 830,759 $ 383,731 $ 2,122,635 $ 10,812,828 Total loans: Risk rating: Pass $ 47,152 $ 2,795,551 $ 8,711,468 $ 7,226,734 $ 3,377,725 $ 2,101,861 $ 1,047,522 $ 2,834,303 $ 28,095,164 Special mention 52 93,801 66,443 48,159 20,772 43,983 9,778 43,350 326,286 Potential problem 447 25,889 59,240 36,709 56,016 51,043 19,637 18,118 266,651 Nonaccrual 5,595 56 17,360 29,972 15,479 4,116 5,343 39,141 111,467 Total loans $ 53,246 $ 2,915,297 $ 8,854,510 $ 7,341,574 $ 3,469,992 $ 2,201,004 $ 1,082,280 $ 2,934,912 $ 28,799,569 (a) Revolving loans converted to term loans are those reported during the reporting period and are also reported in their year of origination. The following table presents gross charge offs by origination year at December 31, 2023: Gross Charge Offs by Origination Year ($ in thousands) Rev Loans Amortized Cost Basis 2023 2022 2021 2020 2019 Prior Total Commercial and industrial $ 4,130 $ 717 $ 9,594 $ 25,270 $ 5,958 $ — $ 18 $ 45,687 Commercial real estate-owner occupied — — — — — 25 — 25 Commercial and business lending 4,130 717 9,594 25,270 5,958 25 18 45,713 Commercial real estate-investor — — — — — — 252 252 Real estate construction — — — — — — 25 25 Commercial real estate lending — — — — — — 277 277 Total commercial 4,130 717 9,594 25,270 5,958 25 295 45,989 Residential mortgage — 2 32 42 148 5 723 952 Auto finance — 795 4,524 626 — 5 — 5,950 Home equity 53 21 3 31 — 22 294 424 Other consumer 4,884 — 72 124 131 72 170 5,453 Total consumer 4,937 818 4,630 823 279 105 1,187 12,779 Total gross charge offs $ 9,068 $ 1,535 $ 14,224 $ 26,093 $ 6,237 $ 130 $ 1,482 $ 58,768 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 policies for ACLL, nonaccrual loans, and charge offs. See Note 1 for the Corporation's accounting policy for loans. 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 warrant specific attention from management. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Accruing loan modifications could be pass or special mention, depending on the risk rating on the loan. 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. Management has determined commercial loan relationships in nonaccrual status, and commercial and consumer loan relationships with their terms restructured in a loan modification, meet the criteria to be individually evaluated. Commercial loans classified as special mention, potential problem, and nonaccrual are reviewed at a minimum on a quarterly basis, while pass credits, which are performing rated credits, are generally 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 December 31, 2023: Accruing ($ in thousands) Current 30-59 Days 60-89 Days 90+ Days Nonaccrual (a)(b) Total Commercial and industrial $ 9,663,587 $ 5,374 $ 191 $ 380 $ 62,022 $ 9,731,555 Commercial real estate - owner occupied 1,059,948 — 358 — 1,394 1,061,700 Commercial and business lending 10,723,536 5,374 549 380 63,416 10,793,255 Commercial real estate - investor 5,086,117 — 18,697 19,432 — 5,124,245 Real estate construction 2,271,392 — — — 6 2,271,398 Commercial real estate lending 7,357,509 — 18,697 19,432 6 7,395,644 Total commercial 18,081,044 5,374 19,246 19,812 63,422 18,188,898 Residential mortgage 7,780,304 13,294 152 — 71,142 7,864,891 Auto finance 2,232,906 14,712 2,674 73 5,797 2,256,162 Home equity 615,810 3,500 708 — 8,508 628,526 Other consumer 273,644 1,233 932 1,803 128 277,740 Total consumer 10,902,664 32,739 4,467 1,876 85,574 11,027,319 Total loans $ 28,983,708 $ 38,113 $ 23,712 $ 21,689 $ 148,997 $ 29,216,218 (a) Of the total nonaccrual loans, $80 million, or 53%, were current with respect to payment at December 31, 2023. (b) No interest income was recognized on nonaccrual loans for the year ended December 31, 2023. In addition, there were $23 million of nonaccrual loans for which there was no related ACLL at December 31, 2023. The following table presents loans by past due status at December 31, 2022: Accruing ($ in thousands) Current 30-59 Days 60-89 Days 90+ Days Nonaccrual (a)(b) Total Commercial and industrial $ 9,738,561 $ 716 $ 5,566 $ 282 $ 14,329 $ 9,759,454 Commercial real estate - owner occupied 991,493 218 12 — — 991,722 Commercial and business lending 10,730,053 934 5,578 282 14,329 10,751,176 Commercial real estate - investor 5,049,897 1,067 — — 29,380 5,080,344 Real estate construction 2,155,077 39 — — 105 2,155,222 Commercial real estate lending 7,204,975 1,105 — — 29,485 7,235,565 Total commercial 17,935,028 2,040 5,578 282 43,814 17,986,742 Residential mortgage 8,443,072 9,811 63 124 58,480 8,511,550 Auto finance 1,371,176 8,238 1,170 — 1,490 1,382,073 Home equity 611,259 5,149 458 — 7,487 624,353 Other consumer 291,722 1,018 592 1,322 197 294,851 Total consumer 10,717,229 24,216 2,283 1,446 67,654 10,812,828 Total loans $ 28,652,257 $ 26,256 $ 7,861 $ 1,728 $ 111,467 $ 28,799,569 (a) Of the total nonaccrual loans, $64 million, or 58%, were current with respect to payment at December 31, 2022. (b) No interest income was recognized on nonaccrual loans for the year ended December 31, 2022. In addition, there were $11 million of nonaccrual loans for which there was no related ACLL at December 31, 2022. Loan Modifications and Troubled Debt Restructurings Under ASU 2022-02, effective January 1, 2023, loan modifications are reported if concessions have been granted to borrowers that are experiencing financial difficulty. Information on these loan modifications originated after the effective date is presented according to the new accounting guidance. Reporting periods prior to the adoption of ASU 2022-02 present information on TDRs under the previous disclosure requirements. See Note 1 for the Corporation's accounting policy for loan modifications and TDRs. The following tables show the composition of loan modifications made to borrowers experiencing financial difficulty by the loan portfolio and type of concessions granted during the twelve months ended December 31, 2023. Each of the types of concessions granted comprised less than 1% of their respective classes of loan portfolios at December 31, 2023. Interest Rate Concession ($ in thousands) Amortized Cost Commercial and industrial $ 306 Auto 255 Home equity 77 Other consumer 1,449 Total loans modified $ 2,087 Term Extension ($ in thousands) Amortized Cost Residential mortgage $ 208 Home equity 25 Total loans modified $ 233 Combination - Interest Rate Concession and Term Extension ($ in thousands) Amortized Cost Residential mortgage $ 865 Home equity 339 Total loans modified $ 1,204 The following tables summarize, by loan portfolio, the financial effect of the Corporation's loan modifications on the modified loans as of December 31, 2023: Interest Rate Concession Loan Type Financial Effect, Weighted Average Contractual Interest Rate (Decrease) Increase (a) Commercial and industrial (19) % Residential mortgage 1 % Auto (9) % Home equity — % Other consumer (21) % Weighted average of total loans modified (11) % (a) Due to market conditions, some interest rate concessions on floating rate loans may involve an increase in rate that was lower in comparison to the rate of increase for floating rate loans not modified. Term Extension Loan Type Financial Effect, Weighted Average Term Increase (a) Residential mortgage 65 months Home equity 85 months Weighted average of total loans modified 71 months (a) During the twelve months ended December 31, 2023, term extensions changed the weighted average term on modified loans from 175 to 245 months. The Corporation closely monitors the performance of loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following table depicts the performance of loans that have been modified in the twelve months ended December 31, 2023: Payment Status (Amortized Cost Basis) ($ in thousands) Current 30-89 Days Past Due 90+ Days Past Due Nonaccrual Commercial and industrial $ 306 $ — $ — $ — Residential mortgage 405 — — 668 Auto 218 36 — — Home equity 258 47 — 137 Other consumer 1,449 — — — Total loans modified $ 2,636 $ 83 $ — $ 805 The following table provides the amortized cost of loan modifications by loan portfolio and type of concession that were modified in the previous twelve months and subsequently had a payment default, as of December 31, 2023: Amortized Cost of Loan Modifications that Subsequently Defaulted ($ in thousands) Interest Rate Concession Term Extension Combination Interest Rate Reduction and Term Extension Residential mortgage $ — $ 208 $ 248 Home equity — — 27 Total loans modified $ — $ 208 $ 275 The following table presents nonaccrual and performing restructured loans by loan portfolio at December 31, 2022, prior to the adoption of ASU 2022-02: December 31, 2022 ($ in thousands) Performing Restructured Loans Nonaccrual Restructured Loans (a) Commercial and industrial $ 12,453 $ — Commercial real estate - owner occupied 316 — Commercial real estate - investor 128 2,074 Real estate construction 195 9 Residential mortgage 16,829 17,117 Home equity 2,148 927 Other consumer 798 — Total restructured loans $ 32,868 $ 20,127 (a) Nonaccrual restructured loans have been included within nonaccrual loans. The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance at December 31, 2022: December 31, 2022 ($ in thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 2 $ 281 $ 281 Residential mortgage 55 10,557 10,777 Home equity 15 531 557 Total loans modified 72 $ 11,370 $ 11,616 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-modification outstanding recorded investment. For the year ended December 31, 2022, restructured loan modifications of commercial loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of consumer loans for the year ended December 31, 2022 primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions. The following table provides the number of loans modified during the previous twelve months which subsequently defaulted during the year ended December 31, 2022, and the recorded investment in these restructured loans at the time of default as of December 31, 2022: December 31, 2022 ($ in thousands) Number of Recorded Residential mortgage 4 $ 1,178 The nature and extent of the impairment of modified loans, including those which have experienced a subsequent payment default, are considered in the determination of an appropriate level of the ACLL. Allowance for Credit Losses on Loans The ACLL is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the ACLL represents management’s estimate of an amount appropriate to provide for expected lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimates of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. A main factor in the determination of the ACLL is the economic forecast. The forecast the Corporation used for December 31, 2023 was the Moody's baseline scenario from November 2023, which was reviewed against the December 31, 2023 baseline scenario with no material updates made, over a 2 year reasonable and supportable period with straight-line reversion to historical losses over the second year of the period. See Note 1 for the Corporation's accounting policy on the ACLL. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). See Note 16 for additional information on the change in the allowance for unfunded commitments. The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2023: ($ in thousands) Dec 31, 2022 Charge Offs Recoveries Net Charge Offs Provision for Credit Losses Dec 31, 2023 ACLL / Loans Allowance for loan losses Commercial and industrial $ 119,076 $ (45,687) $ 3,015 $ (42,672) $ 51,859 $ 128,263 Commercial real estate — owner occupied 9,475 (25) 11 (15) 1,150 10,610 Commercial and business lending 128,551 (45,713) 3,026 (42,687) 53,009 138,873 Commercial real estate — investor 54,398 (252) 3,016 2,763 10,697 67,858 Real estate construction 45,589 (25) 80 55 7,910 53,554 Commercial real estate lending 99,986 (277) 3,095 2,819 18,607 121,412 Total commercial 228,538 (45,989) 6,121 (39,868) 71,616 260,285 Residential mortgage 38,298 (952) 541 (411) (79) 37,808 Auto finance 19,619 (5,950) 1,241 (4,709) 10,051 24,961 Home equity 14,875 (424) 1,262 837 (310) 15,403 Other consumer 11,390 (5,453) 978 (4,475) 5,723 12,638 Total consumer 84,182 (12,779) 4,021 (8,758) 15,384 90,809 Total loans $ 312,720 $ (58,768) $ 10,142 $ (48,626) $ 87,000 $ 351,094 Allowance for unfunded commitments Commercial and industrial $ 12,997 $ — $ — $ — $ 321 $ 13,319 Commercial real estate — owner occupied 103 — — — 46 149 Commercial and business lending 13,101 — — — 367 13,468 Commercial real estate — investor 710 — — — (230) 480 Real estate construction 20,583 — — — (3,558) 17,024 Commercial real estate lending 21,292 — — — (3,788) 17,504 Total commercial 34,393 — — — (3,421) 30,972 Home equity 2,699 — — — (70) 2,629 Other consumer 1,683 — — — (509) 1,174 Total consumer 4,382 — — — (579) 3,803 Total loans $ 38,776 $ — $ — $ — $ (4,000) $ 34,776 Allowance for credit losses on loans Commercial and industrial $ 132,073 $ (45,687) $ 3,015 $ (42,672) $ 52,181 $ 141,582 1.45 % Commercial real estate — owner occupied 9,579 (25) 11 (15) 1,195 10,759 1.01 % Commercial and business lending 141,652 (45,713) 3,026 (42,687) 53,376 152,341 1.41 % Commercial real estate — investor 55,108 (252) 3,016 2,763 10,467 68,338 1.33 % Real estate construction 66,171 (25) 80 55 4,351 70,578 3.11 % Commercial real estate lending 121,279 (277) 3,095 2,819 14,819 138,916 1.88 % Total commercial 262,931 (45,989) 6,121 (39,868) 68,195 291,257 1.60 % Residential mortgage 38,298 (952) 541 (411) (79) 37,808 0.48 % Auto finance 19,619 (5,950) 1,241 (4,709) 10,051 24,961 1.11 % Home equity 17,574 (424) 1,262 837 (380) 18,032 2.87 % Other consumer 13,073 (5,453) 978 (4,475) 5,214 13,812 4.97 % Total consumer 88,565 (12,779) 4,021 (8,758) 14,805 94,613 0.86 % Total loans $ 351,496 $ (58,768) $ 10,142 $ (48,626) $ 83,000 $ 385,870 1.32 % The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2022: ($ in thousands) Dec 31, 2021 Charge Offs Recoveries Net Charge Offs Provision for Credit Losses Dec 31, 2022 ACLL / Loans Allowance for loan losses Commercial and industrial $ 89,857 $ (4,491) $ 5,282 $ 791 $ 28,428 $ 119,076 Commercial real estate — owner occupied 11,473 — 13 13 (2,011) 9,475 Commercial and business lending 101,330 (4,491) 5,295 804 26,418 128,551 Commercial real estate — investor 72,803 (50) 50 — (18,405) 54,398 Real estate construction 37,643 (48) 106 58 7,887 45,589 Commercial real estate lending 110,446 (98) 156 58 (10,518) 99,986 Total commercial 211,776 (4,588) 5,451 862 15,900 228,538 Residential mortgage 40,787 (567) 908 341 (2,830) 38,298 Auto finance 1,999 (1,041) 98 (943) 18,563 19,619 Home equity 14,011 (587) 1,385 798 66 14,875 Other consumer 11,441 (3,363) 1,010 (2,353) 2,301 11,390 Total consumer 68,239 (5,558) 3,401 (2,157) 18,100 84,182 Total loans $ 280,015 $ (10,146) $ 8,852 $ (1,294) $ 34,000 $ 312,720 Allowance for unfunded commitments Commercial and industrial $ 18,459 $ — $ — $ — $ (5,462) $ 12,997 Commercial real estate — owner occupied 208 — — — (105) 103 Commercial and business lending 18,667 — — — (5,566) 13,101 Commercial real estate — investor 936 — — — (226) 710 Real estate construction 15,586 — — — 4,997 20,583 Commercial real estate lending 16,522 — — — 4,770 21,292 Total commercial 35,189 — — — (796) 34,393 Home equity 2,592 — — — 107 2,699 Other consumer 1,995 — — — (311) 1,683 Total consumer 4,587 — — — (204) 4,382 Total loans $ 39,776 $ — $ — $ — $ (1,000) $ 38,776 Allowance for credit losses on loans Commercial and industrial $ 108,316 $ (4,491) $ 5,282 $ 791 $ 22,967 $ 132,073 1.35 % Commercial real estate — owner occupied 11,681 — 13 13 (2,115) 9,579 0.97 % Commercial and business lending 119,997 (4,491) 5,295 804 20,852 141,652 1.32 % Commercial real estate — investor 73,739 (50) 50 — (18,631) 55,108 1.08 % Real estate construction 53,229 (48) 106 58 12,884 66,171 3.07 % Commercial real estate lending 126,968 (98) 156 58 (5,748) 121,279 1.68 % Total commercial 246,965 (4,588) 5,451 862 15,104 262,931 1.46 % Residential mortgage 40,787 (567) 908 341 (2,830) 38,298 0.45 % Auto finance 1,999 (1,041) 98 (943) 18,563 19,619 1.42 % Home equity 16,603 (587) 1,385 798 173 17,574 2.81 % Other consumer 13,436 (3,363) 1,010 (2,353) 1,990 13,073 4.43 % Total consumer 72,825 (5,558) 3,401 (2,157) 17,896 88,565 0.82 % Total loans $ 319,791 $ (10,146) $ 8,852 $ (1,294) $ 33,000 $ 351,496 1.22 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Other Intangible Assets Goodwill Goodwill is not amortized but is instead subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. See Note 1 for the Corporation’s accounting policy for goodwill and other intangible assets. The Corporation conducted its most recent annual impairment testing in May 2023, 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 KBW Nasdaq Regional Banking Index (KRX), 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 2023 impairment test that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2023, 2022, or 2021. The Corporation had goodwill of $1.1 billion at both December 31, 2023 and 2022. Other Intangible Assets The Corporation has CDIs and historically had other intangible assets, both of which are amortized. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in thousands) 2023 2022 2021 Core deposit intangibles Gross carrying amount at the beginning of the year $ 88,109 $ 88,109 $ 88,109 Accumulated amortization (47,638) (38,827) (30,016) Net book value $ 40,471 $ 49,282 $ 58,093 Amortization during the year $ 8,811 $ 8,811 $ 8,811 Other intangibles Gross carrying amount at the beginning of the year $ — $ — $ 2,000 Reductions due to sale — — (1,317) Accumulated amortization — — (683) Net book value $ — $ — $ — Amortization during the year $ — $ — $ 33 Mortgage Servicing Rights The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. On January 1, 2022, the Corporation made the irrevocable election to account for its MSRs under the fair value measurement method, with any change in fair value being recognized through earnings in mortgage banking, net on the consolidated statements of income. See Note 1 for the Corporation’s accounting policy for MSRs. See Note 16 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 18 which further discusses fair value measurement relative to the MSRs asset. A summary of changes in the balance of the MSRs asset under the fair value measurement method for the years ended December 31, 2023 and 2022 is as follows: ($ in thousands) 2023 2022 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 77,351 $ 54,862 Cumulative effect of accounting methodology change N/A 2,296 Balance at beginning of period, adjusted $ 77,351 $ 57,158 Additions 3,564 7,279 Paydowns (7,185) (9,350) Valuation: Change in fair value model assumptions 8,881 5,715 Changes in fair value of asset 1,778 16,549 Mortgage servicing rights at end of period $ 84,390 $ 77,351 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) (a) $ 7,364,492 $ 6,711,820 Mortgage servicing rights to servicing portfolio (a) 1.15 % 1.15 % (a) During the fourth quarter of 2023, the Corporation transferred $969 million of residential mortgages into held for sale and subsequently sold them for $844 million. After sale, the servicing has been retained for a short period until full servicing can be transferred to the purchaser. Prior to January 1, 2022, the Corporation accounted for its MSRs under the amortization methodology. See Note 1 for the Corporation’s accounting policy for MSRs when they were still under the amortization methodology. A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance under the amortization methodology for the year ended December 31, 2021 is as follows: ($ in thousands) 2021 Mortgage servicing rights Mortgage servicing rights at beginning of year $ 59,967 Additions 16,151 Amortization (19,436) Mortgage servicing rights at end of year $ 56,682 Valuation allowance at beginning of year (18,006) (Additions) recoveries, net 16,186 Valuation allowance at end of year (1,820) Mortgage servicing rights, net $ 54,862 Fair value of mortgage servicing rights $ 57,259 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) 6,994,834 Mortgage servicing rights, net to servicing portfolio 0.78 % Mortgage servicing rights expense (a) $ 3,250 (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 on the consolidated statements of income. The projections of amortization expense for CDIs and decay for MSRs are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2023. The actual 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 CDIs and decay for MSRs: ($ in thousands) Core Deposit Intangibles Mortgage Servicing Rights Year ending December 31, 2024 $ 8,811 $ 10,555 2025 8,811 11,404 2026 8,811 10,710 2027 8,811 9,922 2028 3,485 9,005 Beyond 2028 1,742 32,794 Total estimated amortization expense and MSRs decay (a) $ 40,471 $ 84,390

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment See Note 1 for the Corporation’s accounting policy for premises and equipment. A summary of premises and equipment at December 31, 2023 and 2022 is as follows: 2023 2022 ($ in thousands) Estimated Cost Accumulated Net Book Net Book Land — $ 63,984 $ — $ 63,984 $ 65,516 Land improvements 3 – 20 years 21,659 10,409 11,250 10,074 Buildings and improvements 5 – 40 years 399,575 187,572 212,004 213,496 Computers and related equipment 4 – 8 years 57,265 46,420 10,845 12,606 Furniture, fixtures and other equipment 3 – 20 years 124,108 88,481 35,627 33,110 Operating leases — 43,782 19,070 24,712 25,617 Leasehold improvements 2 – 20 years 39,607 25,051 14,556 16,487 Total premises and equipment $ 749,981 $ 377,003 $ 372,978 $ 376,906 Depreciation and amortization of premises and equipment totaled $30 million for 2023, $31 million for 2022, and $33 million for 2021.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Capital Leases in Financial Statements of Lessee Disclosure	Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. The Corporation also has a finance lease for retail and corporate offices. These leases have original terms of 1 year or longer with remaining maturities up to 39 years, some of which include options to extend the lease term. An analysis of the lease options has been completed and any purchase options or 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 and finance lease costs and cash flows resulting from these leases are presented below: Twelve Months Ended December 31, ($ in thousands) 2023 2022 2021 Operating lease costs $ 6,281 $ 6,812 $ 8,712 Finance lease costs 92 119 107 Operating lease cash flows 7,171 8,440 11,183 Finance lease cash flows 92 125 137 The lease classifications on the consolidated balance sheets were as follows: Consolidated Balance Sheets Category ($ in thousands) December 31, 2023 December 31, 2022 Operating lease right-of-use asset Premises and equipment $ 24,712 $ 25,617 Finance lease right-of-use asset Other assets 368 455 Operating lease liability Accrued expenses and other liabilities 27,311 28,357 Finance lease liability Other long-term funding 383 469 The lease payment obligations, weighted-average remaining lease term, and weighted-average original discount rate were as follows: December 31, 2023 December 31, 2022 ($ in thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Retail and corporate offices $ 25,729 5.76 3.12 % $ 26,140 5.92 2.62 % Land 4,050 6.98 3.48 % 4,766 7.59 3.14 % Equipment 408 2.50 4.62 % — 0.00 — % Total operating leases $ 30,187 5.88 3.19 % $ 30,906 6.17 2.70 % Finance leases Retail and corporate offices $ 394 4.25 1.32 % $ 485 5.25 1.32 % Total finance leases $ 394 4.25 1.32 % $ 485 5.25 1.32 % Contractual 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) Operating Leases Finance Leases Total Leases Twelve months ending December 31, 2024 $ 6,459 $ 93 $ 6,552 2025 5,628 93 5,721 2026 5,043 93 5,135 2027 4,373 93 4,465 2028 3,428 23 3,451 Beyond 2028 5,257 — 5,257 Total lease payments $ 30,187 $ 394 $ 30,581 Less: interest 2,877 11 2,887 Present value of lease payments $ 27,311 $ 383 $ 27,694 At December 31, 2023 and 2022, additional operating leases, primarily retail and corporate offices, that had not yet commenced totaled $3 million and $13 million, respectively. The leases that had not yet commenced as of December 31, 2023 will commence between January 2024 and April 2025 with lease terms of 1 year to 7 years. The Corporation conducts a portion of its business through certain facilities and equipment under non-cancelable operating leases. The Corporation also leases a subdivision of some of its facilities and receives rental income from such lease agreements. The approximate minimum annual rental payments and rental receipts under non-cancelable agreements and leases are as follows: ($ in thousands) Payments Receipts 2024 $ 6,352 $ 3,522 2025 5,436 3,854 2026 5,117 3,539 2027 4,447 3,146 2028 3,448 2,338 Beyond 2028 5,447 12,446 Total $ 30,247 $ 28,843

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
Deposits [Abstract]
Deposits	Deposits The distribution of deposits at December 31, 2023 and 2022 are as follows: ($ in thousands) 2023 2022 Noninterest-bearing demand $ 6,119,956 $ 7,760,811 Savings 4,835,701 4,604,848 Interest-bearing demand 8,843,967 7,100,727 Money market 6,330,453 8,239,610 Brokered CDs 4,447,479 541,916 Other time deposits 2,868,494 1,388,242 Total deposits $ 33,446,049 $ 29,636,154 Time deposits in excess of $250,000 were $523 million and $282 million at December 31, 2023 and 2022, respectively. Aggregate annual maturities of all time deposits at December 31, 2023, are as follows: Maturities During Year Ending December 31, ($ in thousands) 2024 $ 7,100,729 2025 175,549 2026 20,680 2027 11,694 2028 7,315 Thereafter 5 Total $ 7,315,973

Short and Long-Term Funding

Short and Long-Term Funding	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	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), and long-term funding (funding with original contractual maturities greater than one year): ($ in thousands) December 31, 2023 December 31, 2022 Short-term funding Federal funds purchased $ 220,160 $ 344,170 Securities sold under agreements to repurchase 106,620 240,969 Federal funds purchased and securities sold under agreements to repurchase 326,780 585,139 Commercial paper — 20,798 Total short-term funding $ 326,780 $ 605,937 Long-term funding Corporation subordinated notes, at par $ 550,000 $ 250,000 Discount and capitalized costs (7,748) (544) Subordinated debt fair value hedge (a) (1,366) (1,855) Finance leases 383 469 Total long-term funding $ 541,269 $ 248,071 Total short and long-term funding, excluding FHLB advances $ 868,049 $ 854,007 FHLB advances Short-term FHLB advances $ 740,000 $ 3,125,000 Long-term FHLB advances 1,209,907 1,209,170 FHLB advances fair value hedge (a) (9,713) (14,308) Total FHLB advances $ 1,940,194 $ 4,319,861 Total short and long-term funding $ 2,808,243 $ 5,173,869 (a) For additional information on the fair value hedges, see Note 14. Securities Sold Under Agreement to Repurchase 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). The Corporation utilizes repurchase agreements to facilitate the needs of its customers. The fair value of securities pledged to secure repurchase agreements may decline. At December 31, 2023, the Corporation had pledged securities valued at 191% of the gross outstanding balance of repurchase agreements to manage this risk. The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of December 31, 2023 and 2022 are presented in the following table: Overnight and Continuous ($ in thousands) December 31, 2023 December 31, 2022 Repurchase agreements Agency mortgage-related securities $ 106,620 $ 240,969 Long-Term Funding 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. In February 2023, the Corporation issued $300 million of 10-year subordinated notes, due March 1, 2033 and redeemable (i) on the reset date of March 1, 2028 and any interest payment date thereafter, (ii) at any time on or after the three month period prior to the maturity date, and (iii) upon the occurrence of a Regulatory Capital Treatment Event (as defined in the Global Note). The subordinated notes have a fixed coupon interest rate of 6.625% until the reset date, after which the rate will be equal to the Five-Year U.S. Treasury Rate as of the reset date plus 2.812% per annum. The notes were issued at a discount. Finance Leases Finance leases are used in conjunction with branch operations. See Note 7 for additional disclosure regarding the Corporation’s leases. FHLB Advances Under agreements with the FHLB of Chicago, FHLB advances are secured by pledging qualifying collateral of the subsidiary bank (such as residential mortgage, residential mortgage loans held for sale, home equity, CRE and investment securities). At December 31, 2023, the Corporation had $10.5 billion of total collateral capacity, primarily supported by pledged consumer and CRE loans and investment securities. At December 31, 2023, the FHLB advances had maturity or call dates ranging from 2024 through 2029 , and had a weighted average interest rate of 4.93%, compared to 4.06% at December 31, 2022. The Corporation prepaid $400 million in long-term FHLB advances during the first quarter of 2022 with no prepayment fee. The table below summarizes the expected maturities of the Corporation’s long-term funding at December 31, 2023: ($ in thousands) Long Term Funding Year 2024 $ 248,884 2025 394,797 2026 604,540 2027 671 2028 198,966 Beyond 2028 293,605 Total long-term funding $ 1,741,463

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Preferred Equity: In June 2015, the Corporation issued 2.6 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 6.125% Non-Cumulative Perpetual Preferred Stock, Series C, liquidation preference $1,000 per share. On June 15, 2021, the Corporation redeemed all remaining Series C depositary shares for $65 million. In September 2016, the Corporation issued 4.0 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 5.375% Non-Cumulative Perpetual Preferred Stock, Series D, liquidation preference $1,000 per share. On July 25, 2017, the Board of Directors authorized the repurchase of up to $15 million of depositary shares of the Corporation's Series D Preferred Stock. During 2018, the Corporation repurchased approximately 22,000 depositary shares for $1 million. On September 15, 2021, the Corporation redeemed all remaining Series D depositary shares for $99 million. In September 2018, the Corporation issued 4.0 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 5.875% Non-Cumulative Perpetual Preferred Stock, Series E, liquidation preference $1,000 per share. Dividends on the Series E Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.875%. Shares of the Series E Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series E Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment. The Series E Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on December 15, 2023, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends. Except in certain limited circumstances, the Series E Preferred Stock does not have any voting rights. In June 2020, the Corporation issued 4.0 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 5.625% Non-Cumulative Perpetual Preferred Stock, Series F, liquidation preference $1,000 per share. Dividends on the Series F Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.625%. Shares of the Series F Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series F Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment. The Series F Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on September 15, 2025, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends. Except in certain limited circumstances, the Series F Preferred Stock does not have any voting rights. Subsidiary Equity: At December 31, 2023, subsidiary equity equaled $4.1 billion. See Note 19 for additional information on regulatory requirements for the Bank. Common Stock Repurchases: In 2023, the Board of Directors did not approve any additional authorizations for the repurchase of the Corporation's common stock. In 2021, the Board of Directors approved additional authorizations for the repurchase of up to $100 million of the Corporation’s common stock. During both 2023 and 2022, the Corporation did not repurchase any shares under the share repurchase program. As of December 31, 2023, $80 million remained available to repurchase shares of common stock under previously approved Board of Director authorizations. Any repurchase of shares under this authorization will be based on market and investment opportunities, capital levels, growth prospects, and any necessary regulatory approvals and other 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. The Corporation also repurchased shares in satisfaction of minimum tax withholding obligations in connection with settlements of equity compensation totaling $7 million (297,564 shares at an average cost per common share of $22.16) during 2023, compared to $6 million (267,605 shares at an average cost per common share of $24.22) during 2022. Other Comprehensive Income (Loss): See the Consolidated Statements of Comprehensive Income for a summary of activity in other comprehensive income (loss) and see Note 22 for a summary of the components of accumulated other comprehensive income (loss).

Compensation Related Costs, Gen

Compensation Related Costs, General	12 Months Ended
	Dec. 31, 2023
Compensation Related Costs [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Stock-Based Compensation Stock-Based Compensation Plan In February 2020, the Board of Directors, with subsequent approval of the Corporation’s shareholders, approved the adoption of the 2020 Incentive Compensation Plan. All remaining shares available for grant under the 2017 Incentive Compensation Plan were rolled into the 2020 Plan. As of December 31, 2023, approximately 7.2 million shares remained available for grant under the 2020 Plan. Under the 2020 Plan, options are generally exercisable up to ten years from the date of grant, have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date, and vest ratably over 4 years. The Corporation also issues restricted stock awards under the 2020 Plan. The shares of restricted stock are restricted as to transfer, but are not restricted as to dividend payment or voting rights. Restricted stock units receive dividend equivalents but do not have voting rights. The transfer restrictions lapse over three years or four years, depending upon whether the awards are performance-based or service-based. Performance-based awards are based on total shareholder return, return on capital metrics, and continued employment or meeting the requirements for retirement, and service-based awards are contingent upon continued employment or meeting the requirements for retirement. Performance-based restricted stock awards granted during 2022 and 2023 will cliff-vest after the three The 2020 Plan provides that restricted stock awards and stock options will immediately become fully vested upon retirement from the Corporation of retirement eligible colleagues. See Note 1 for the Corporation’s accounting policy for stock based compensation. Accounting for Stock-Based Compensation 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 colleagues who meet the definition of retirement eligible under the 2017 Plan and the 2020 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 on the consolidated statements of income. A summary of the Corporation’s stock option activity for the year ended December 31, 2023 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Aggregate Intrinsic Value (a) Outstanding at December 31, 2022 3,994 $ 21.06 5.11 years $ 10,525 Exercised 178 17.26 Forfeited or expired 24 19.54 Outstanding at December 31, 2023 3,792 $ 21.25 4.26 years $ 5,834 Options exercisable at December 31, 2023 3,583 $ 21.44 4.15 years $ 5,139 (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 years ended December 31, 2023, 2022, and 2021, the intrinsic value of stock options exercised was approximately $518,000, $4 million, and $9 million, respectively. The total fair value of stock options that vested was approximately $943,000 for the year ended December 31, 2023, $2 million for the year ended December 31, 2022, and $4 million for the year ended December 31, 2021. For the years ended December 31, 2023, 2022, and 2021, the Corporation recognized compensation expense of approximately $333,000, approximately $710,000, and $1 million, respectively, for the vesting of stock options. Compensation expense for 2023 related to the accelerated vesting of stock options granted to retirement eligible colleagues was immaterial. At December 31, 2023, the Corporation had approximately $32,000 of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominantly through the first quarter of 2024. The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2023: Restricted Stock Shares (a) Weighted Average Outstanding at December 31, 2022 2,303 $ 20.81 Granted 880 22.10 Vested 778 21.02 Forfeited 55 21.90 Outstanding at December 31, 2023 2,349 $ 21.20 (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. Expense for restricted stock awards of $17 million was recorded for the year ended December 31, 2023, $16 million for the year ended December 31, 2022 and $15 million for the year ended December 31, 2021. Included in compensation expense for 2023 was $3 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $20 million of unrecognized compensation costs related to restricted stock awards at December 31, 2023 that are expected to be recognized over the remaining requisite service periods that extend predominantly through the first quarter of 2027. 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. As described in Note 10, 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, if any, 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.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit 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. The funded status and amounts recognized on the 2023 and 2022 consolidated balance sheets, as measured on December 31, 2023 and 2022, respectively, for the RAP and Postretirement Plan were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2023 2023 2022 2022 Change in fair value of plan assets Fair value of plan assets at beginning of year $ 407,405 $ — $ 497,796 $ — Actual return on plan assets 60,565 — (74,140) — Employer contributions — 171 — 193 Gross benefits paid (14,513) (171) (16,252) (193) Fair value of plan assets at end of year (a) $ 453,457 $ — $ 407,405 $ — Change in benefit obligation Net benefit obligation at beginning of year $ 208,315 $ 1,530 $ 261,321 $ 1,975 Service cost 3,189 — 3,670 — Interest cost 10,887 78 7,152 53 Actuarial (gain) loss 3,475 (12) (47,577) (305) Gross benefits paid (14,513) (171) (16,252) (193) Net benefit obligation at end of year (a) $ 211,353 $ 1,425 $ 208,315 $ 1,530 Funded (unfunded) status $ 242,104 $ (1,425) $ 199,089 $ (1,530) Noncurrent assets $ 242,104 $ — $ 199,089 $ — Current liabilities — (158) — (164) Noncurrent liabilities — (1,267) — (1,366) Asset (liability) recognized on the consolidated balance sheets $ 242,104 $ (1,425) $ 199,089 $ (1,530) (a) The fair value of the plan assets represented 215% and 196% of the net benefit obligation of the pension plan at December 31, 2023 and 2022, respectively. Amounts recognized in accumulated other comprehensive (income) loss, net of tax, as of December 31, 2023 and 2022 were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2023 2023 2022 2022 Prior service cost $ (884) $ (308) $ (1,064) $ (362) Net actuarial loss (gain) 27,089 (301) 44,919 (316) Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss $ 26,204 $ (609) $ 43,855 $ (678) Other changes in plan assets and benefit obligations recognized in OCI, net of tax, in 2023 and 2022 were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2023 2023 2022 2022 Net actuarial gain (loss) $ 24,228 $ 12 $ (53,466) $ 305 Amortization of prior service cost (250) (75) (250) (75) Amortization of actuarial loss (gain) — (29) 658 — Income tax benefit (expense) (6,327) 23 13,553 (58) Total recognized in OCI $ 17,650 $ (68) $ (39,504) $ 171 The components of net periodic pension cost for the RAP for 2023, 2022, and 2021 were as follows: ($ in thousands) 2023 2022 2021 Service cost $ 3,189 $ 3,670 $ 7,779 Interest cost 10,887 7,152 6,570 Expected return on plan assets (32,862) (26,903) (25,675) Amortization of prior service cost (250) (250) (73) Amortization of actuarial loss — 658 4,594 Recognized settlement loss — — 434 Total net periodic pension (income) $ (19,037) $ (15,673) $ (6,370) The components of net periodic benefit cost for the Postretirement Plan for 2023, 2022, and 2021 were as follows: ($ in thousands) 2023 2022 2021 Interest cost $ 78 $ 53 $ 52 Amortization of prior service cost (75) (75) (75) Amortization of actuarial (gain) (29) — — Total net periodic benefit (income) $ (26) $ (22) $ (24) 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 on the consolidated statements of income. The service cost components are included in personnel on the consolidated statements of income. RAP Postretirement RAP Postretirement 2023 2023 2022 2022 Weighted average assumptions used to determine benefit obligations Discount rate 5.40 % 5.40 % 5.40 % 5.40 % Rate of increase in compensation levels 2.50 % N/A 2.50 % N/A Interest crediting rate 3.77 % N/A 3.46 % N/A Weighted average assumptions used to determine net periodic benefit costs Discount rate 5.40 % 5.40 % 2.80 % 2.80 % Rate of increase in compensation levels 2.50 % N/A 2.50 % N/A Expected long-term rate of return on plan assets 7.30 % N/A 6.00 % N/A The expected long-term (more than 20 years) rate of return was estimated using market benchmarks for equities and bonds applied to the RAP’s anticipated asset allocations. The expected return on equities was computed utilizing a valuation framework, which projected future returns based on current equity valuations rather than historical returns. The actual rates of return for the RAP assets were 15.80% and (15.03)% for 2023 and 2022, respectively. The RAP’s investments are exposed to various risks, such as interest rate, market, and credit risks. Due to the level of risks associated with certain investments and the level of uncertainty related to changes in the value of the investments, it is at least reasonably possible that changes in risks in the near term could materially affect the amounts reported. The investment objective for the RAP is to ensure there are sufficient assets to pay pension obligations when they come due while mitigating risks and providing prudent governance. The RAP has a diversified portfolio designed to provide liquidity, current income, and growth of income and principal, with anticipated asset allocation ranges of: equity securities 50 to 70%, fixed-income securities 30 to 50%, alternative securities 0 to 15%, and other cash equivalents 0 to 10%. Based on changes in economic and market conditions, the Corporation could be outside of the allocation ranges for brief periods of time. The asset allocation for the RAP as of the December 31, 2023 and 2022 measurement dates, respectively, by asset category were as follows: Asset Category 2023 2022 Equity securities 54 % 53 % Fixed-income securities 34 % 35 % Group annuity contracts 10 % 10 % Other 2 % 2 % Total 100 % 100 % The RAP assets include cash equivalents, such as money market accounts, mutual funds, common / collective trust funds (which include investments in equity and bond securities), and a group annuity contract. Money market accounts are stated at cost plus accrued interest, mutual funds are valued at quoted market prices, investments in common / collective trust funds are valued at the amount at which units in the funds can be withdrawn, and the group annuity contract is valued at fair value by discounting the related cash flows based on current yields of similar instruments with comparable durations and considering the credit worthiness of the issuer. Based on these inputs, the following table summarizes the fair value of the RAP’s investments as of December 31, 2023 and 2022: Fair Value Measurements Using ($ in thousands) December 31, 2023 Level 1 Level 2 Level 3 RAP investments Money market account $ 10,040 $ 10,040 $ — $ — Common /collective trust funds 164,891 164,891 — — Mutual funds 234,840 234,840 — — Group annuity contracts 43,687 — — 43,687 Total RAP investments $ 453,457 $ 409,771 $ — $ 43,687 Fair Value Measurements Using ($ in thousands) December 31, 2022 Level 1 Level 2 Level 3 RAP investments Money market account $ 6,628 $ 6,628 $ — $ — Common /collective trust funds 155,654 155,654 — — Mutual funds 204,184 204,184 — — Group annuity contracts 40,939 — — 40,939 Total RAP investments $ 407,405 $ 366,466 $ — $ 40,939 The following presents a summary of the changes in the fair value of the RAP's Level 3 asset during the periods indicated. Fair Value Reconciliation of Level 3 RAP Investments 2023 2022 Fair value of group annuity contract at beginning of period $ 40,939 $ 49,213 Return on plan assets 5,313 (5,671) Benefits paid (2,565) (2,604) Fair value of group annuity contract at end of period $ 43,687 $ 40,939 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 to the RAP during 2023 and 2022. The projected benefit payments were calculated using the same assumptions as those used to calculate the benefit obligations listed above. The projected benefit payments for the RAP and Postretirement Plan at December 31, 2023, reflecting expected future services, were as follows: ($ in thousands) RAP Postretirement Plan Estimated future benefit payments 2024 $ 20,198 $ 163 2025 22,320 158 2026 21,163 152 2027 19,804 146 2028 19,842 140 2029-2033 83,328 595 The health care trend rate is an assumption as to how much the Postretirement Plan’s medical costs will change each year in the future. There are no remaining participants under age 65 in the Postretirement Plan. The actual change in 2023 health care premium rates for post-65 coverage was an increase of 4.00%. The health care trend rate assumption for post-65 coverage assumes a 5.00% rate of increase for 2024 and future years. The Corporation also has a 401(k) and Employee Stock Ownership Plan (the “401(k) plan”). The Corporation’s contribution is determined by the Compensation and Benefits Committee of the Board of Directors. Total expenses related to contributions to the 401(k) plan were $16 million, $15 million, and $13 million for 2023, 2022, and 2021, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The current and deferred amounts of income tax expense (benefit) were as follows: Years Ended December 31, ($ in thousands) 2023 2022 2021 Current Federal $ 29,319 $ 58,982 $ 57,916 State 5,283 22,092 12,035 Total current 34,602 81,074 69,951 Deferred Federal (8,371) 12,531 9,115 State (3,135) (97) 6,247 Total deferred (11,506) 12,434 15,362 Total income tax expense $ 23,097 $ 93,508 $ 85,313 Temporary differences between the amounts reported on the financial statements and the tax bases of assets and liabilities resulted in deferred taxes. DTAs and liabilities at December 31, 2023 and 2022, included in other assets and accrued expenses and other liabilities on the consolidated balance sheets, respectively, were as follows: ($ in thousands) 2023 2022 Deferred tax assets Allowance for loan losses $ 83,378 $ 79,142 Allowance for other losses 8,933 10,558 Accrued liabilities 14,089 2,842 Deferred compensation 28,429 30,246 Federal tax credits carryforward 8,849 — Benefit of state tax losses and credit carryforwards 9,068 7,476 Nonaccrual interest 901 891 Partnerships 2,365 — Lease liability 6,785 7,390 Net unrealized losses on AFS securities 48,632 80,148 Net unrealized losses on pension and postretirement benefits 8,506 14,803 Other 9,403 4,545 Total deferred tax assets $ 229,338 $ 238,041 Deferred tax liabilities Prepaid expenses $ 66,381 $ 64,480 Goodwill 22,161 23,119 Mortgage banking activities 20,799 20,145 Deferred loan fee income 8,097 4,269 State deferred taxes 1,387 1,389 Lease financing 15,297 3,145 Bank premises and equipment 20,389 20,860 Purchase accounting 7,898 10,381 Basis difference from equity securities and other investments 7,593 5,582 Other 1,207 821 Total deferred tax liabilities $ 171,209 $ 154,191 Net deferred tax assets $ 58,129 $ 83,850 At December 31, 2023, the Corporation had state net operating loss carryforwards of $126 million (of which $2 million was acquired from various acquisitions) that will begin expiring in 2024. The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows: 2023 2022 2021 Federal income tax rate at statutory rate 21.0 % 21.0 % 21.0 % Increases (decreases) resulting from: Tax-exempt interest and dividends (7.4) % (3.4) % (3.0) % State income taxes (net of federal benefit) 0.3 % 4.2 % 3.8 % Bank owned life insurance (1.1) % (0.5) % (0.6) % Tax effect of tax credits and benefits, net of related expenses (4.7) % (1.6) % (1.8) % Net tax (benefit) from stock-based compensation — % (0.2) % — % Restructuring in conjunction with ABRC sale — % — % (0.1) % FDIC premium 3.0 % 0.7 % 0.5 % Other 0.1 % 0.1 % (0.2) % Effective income tax rate 11.2 % 20.3 % 19.6 % Savings banks acquired by the Corporation in 1997 and 2004 qualified under provisions of the Internal Revenue Code that permitted them to deduct from taxable income an allowance for bad debts that differed from the provision for such losses charged to income for financial reporting purposes. Accordingly, no provision for income taxes has been made for $100 million of retained income at December 31, 2023. If income taxes had been provided, the deferred tax liability would have been approximately $25 million. Management does not expect this amount to become taxable in the future; therefore, no provision for income taxes has been made. The Corporation and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Corporation’s federal income tax returns are open and subject to examination from the 2020 tax return year and forward. The years open to examination by state and local government authorities varies by jurisdiction. A reconciliation of the beginning and ending amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was as f ollows: ($ in thousands) 2023 2022 Balance at beginning of year $ 2,233 $ 2,324 Subtractions for tax positions related to prior years (441) (486) Additions for tax positions related to current year 435 395 Balance at end of year $ 2,227 $ 2,233 The Corporation recognizes interest and penalties accrued related to unrecognized tax benefits in the income tax expense line on the consolidated statements of income. Interest and penalty benefits, as well as accrued interest and penalties, were immaterial at both December 31, 2023 and 2022. At December 31, 2023 and 2022, the Corporation believes it has appropriately accounted for any unrecognized tax benefits. Management does not anticipate significant adjustments to the total amount of unrecognized tax benefits within the next twelve months.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	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, foreign currency, 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 values of which are determined by interest rates and/or foreign currency exchange 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 $93 million and $92 million of investment securities as collateral at December 31, 2023, and 2022, respectively. Cash is often pledged as collateral for derivatives that are not centrally cleared. The Corporation's required cash collateral was $5 million at December 31, 2023, compared to $3 million at December 31, 2022. See Note 18 for fair value information and disclosures and see Note 1 for the Corporation's accounting policy for derivative and hedging activities. To qualify for hedge accounting, a hedging relationship must be highly effective at mitigating the risk associated with the exposure being hedged. The Corporation performs effectiveness assessments of its derivative financial instruments prospectively at inception and both prospectively and retrospectively quarterly thereafter. The initial prospective assessment is performed on a quantitative basis unless the hedging relationship meets certain conditions, and subsequent assessments are performed on a quantitative basis unless certain conditions are met where a qualitative basis may be used. If it is determined that a derivative financial instrument is not highly effective at hedging the designated exposure, hedge accounting is discontinued. Fair Value Hedges of Interest Rate Risk The Corporation is exposed to changes in the fair value of its fixed-rate debt 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 rates. Interest rate swaps designated as fair value hedges involve receiving payment of fixed-rate amounts from a counterparty in exchange for the Corporation paying variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. Fair Value Hedges of Foreign Currency Exchange Rate Risk The Corporation is exposed to changes in the fair value of its foreign currency denominated loans due to changes in foreign currency exchange rates. The Corporation uses foreign currency exchange forward contracts to manage its exposure to changes in fair value on these foreign currency denominated loans. Cash Flow Hedges of Interest Rate Risk The Corporation is exposed to variability in cash flows on its floating rate assets due to changes in benchmark interest rates. The Corporation uses interest rate swaps to hedge certain forecasted transactions for the variability in cash flows attributable to the contractually specified interest rate in order to add stability to net interest income and to manage its exposure to interest rate movements. Interest rate swaps designated as cash flow hedges involve receiving fixed-rate amounts from a counterparty in exchange for the Corporation making variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. These items, along with the net interest from the derivative, are reported in the same income statement line as the interest income from the floating-rate assets. Derivatives to Accommodate Customer Needs The Corporation 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 until early 2022, commodity prices. As of the end of the first quarter of 2022, the Corporation no longer had any outstanding commodity contracts. 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 until the end of the first quarter of 2022, commodity contracts. See Note 15 for additional information and disclosures on balance sheet offsetting. Interest rate-related and other instruments: The Corporation provides interest rate risk management services to commercial customers, primarily 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, except in rare circumstances where the indices are not identical which creates a negligible basis mismatch. The Corporation also enters into credit risk participation agreements with financial institution counterparties for interest rate swaps related to loans as either a participant or a lead bank. The risk participation agreements entered into by the Corporation as a participant bank provide credit protection to the financial institution counterparty should the borrower fail to perform on its interest rate derivative contract with that financial institution. 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: As of the end of the first quarter of 2022, the Corporation no longer had any outstanding commodity contracts. Historically, commodity contracts were entered into primarily for the benefit of commercial customers seeking to manage their exposure to fluctuating commodity prices. The Corporation mitigated 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 values of these commitments are 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 on the consolidated statements of income. Interest rate-related instruments for MSRs hedge: The fair value of the Corporation's MSRs asset changes in response to changes in primary mortgage loan rates and other assumptions. To mitigate the earnings volatility caused by changes in the fair value of MSRs, the Corporation designates certain financial instruments as an economic hedge. Changes in the fair value of these instruments are generally expected to partially offset changes in the fair value of MSRs and are 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 on the consolidated statements of income. The following table presents the total notional amounts and gross fair values of the Corporation's derivatives, as well as the balance sheet netting adjustments as of December 31, 2023 and December 31, 2022. 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 December 31, 2023 and December 31, 2022. 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. December 31, 2023 December 31, 2022 Asset Liability Asset Liability ($ in thousands) Notional Amount Fair Notional Amount Fair Notional Amount Fair Notional Amount Fair Designated as hedging instruments: Interest rate-related instruments $ 2,300,000 $ 8,075 $ 550,000 $ 930 $ 900,000 $ 4,349 $ 1,150,000 $ 1,260 Foreign currency exchange forwards 231,566 632 189,212 2,946 261,595 416 167,088 972 Total designated as hedging instruments 8,707 3,876 4,765 2,233 Not designated as hedging instruments: Interest rate-related and other instruments 3,603,513 111,623 6,528,471 195,662 4,246,823 62,401 4,599,391 251,398 Foreign currency exchange forwards 87,526 2,954 135,654 2,746 68,570 437 34,240 402 Mortgage banking (a) 29,490 439 51,500 673 21,265 86 33,000 46 Total not designated as hedging instruments 115,016 199,082 62,925 251,847 Gross derivatives before netting 123,723 202,958 67,690 254,079 Less: Legally enforceable master netting agreements 18,234 18,234 2,788 2,788 Less: Cash collateral pledged/received 35,855 — 26,898 217 Total derivative instruments, after netting $ 69,634 $ 184,724 $ 38,003 $ 251,073 (a) The notional amount of the mortgage derivative asset includes interest rate lock commitments, while the notional amount of the mortgage derivative liability includes forward commitments. 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) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Carrying Amount of the Hedged Assets/(Liabilities) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) ($ in thousands) December 31, 2023 December 31, 2022 Other long-term funding $ (548,634) $ 1,366 $ (248,145) $ 1,855 FHLB Advances (590,287) 9,713 (585,692) 14,308 Total $ (1,138,921) $ 11,079 $ (833,837) $ 16,163 (a) Excludes hedged items where only foreign currency risk is the designated hedged risk. At December 31, 2023 and 2022, the carrying amount excluded for foreign currency denominated loans was $421 million and $429 million, respectively. The Corporation terminated its $500 million fair value hedge during the fourth quarter of 2019. At December 31, 2023, the amortized cost basis of the closed portfolios which had previously been used in the terminated hedging relationship was $267 million and is included in loans on the consolidated balance sheets. This amount includes $1 million of hedging adjustments on the discontinued hedging relationships, which are not presented in the table above. The tables below identify the effect of fair value and cash flow hedge accounting on the Corporation's consolidated statements of income during the twelve months ended December 31, 2023, 2022, and 2021: Location and Amount Recognized on the Consolidated Statements of Income in Fair Value and Cash Flow Hedging Relationships For the Years Ended December 31, 2023 2022 2021 ($ in thousands) Interest Income Interest Expense Loss on Mortgage Portfolio Sale Interest Income Interest Expense Interest Income Total amounts of income/expense presented on the consolidated statements of income in which the effects of the fair value or cash flow hedges are recorded (a) $ (14,176) $ 17,536 $ (125) $ (263) $ 334 $ (1,376) The effects of fair value and cash flow hedging: Impact on fair value hedging relationships in Subtopic 815-20 Interest contracts: Hedged items (245) 5,084 (125) (529) (16,163) (1,376) Derivatives designated as hedging instruments (a) (13,930) 12,451 — 266 16,497 — (a) Includes net settlements on the derivatives. Location and Amount Recognized on the Consolidated Statements of Income in Fair Value Hedging Relationships For the Years Ended December 31, 2023 2022 2021 ($ in thousands) Capital Markets, Net Capital Markets, Net Capital Markets, Net Total amounts of income/expense presented on the consolidated statements of income in which the effects of fair value hedges are recorded $ — $ (9) $ 55 The effects of fair value hedging: Impact on fair value hedging relationships in Subtopic 815-20 Foreign currency contracts: Hedged items 9,322 (26,686) 1,012 Derivatives designated as hedging instruments (9,322) 26,677 (957) The following table presents the effect of cash flow hedge accounting on accumulated other comprehensive income (loss) for the twelve months ended December 31, 2023, 2022, and 2021: For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Interest rate-related instruments designated as cash flow hedging instruments Amount of gain (loss) recognized in OCI on cash flow hedge derivative (a) $ (13,254) $ 3,626 $ — Amount of (gain) loss reclassified from accumulated other comprehensive income (loss) into interest income (a) 13,930 (266) — (a) The entirety of gains (losses) recognized in OCI as well as those reclassified from accumulated other comprehensive income (loss) into interest income were included components in the assessment of hedge effectiveness. Amounts reported in accumulated other comprehensive income (loss) related to cash flow hedge derivatives are reclassified to interest income as interest payments are made on the hedged variable interest rate assets. The Corporation estimates that $7 million will be reclassified as a decrease to interest income over the next 12 months. This amount could differ from amounts actually recognized due to changes in interest rates, hedge de-designations, or the addition of other hedges subsequent to December 31, 2023. The maximum length of time over which the Corporation is hedging its exposure to the variability in future cash flows is 35 months as of December 31, 2023. The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income during the twelve months ended December 31, 2023, 2022, and 2021: Consolidated Statements of Income Category of For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Derivative Instruments Interest rate-related and other instruments — customer and mirror, net Capital markets, net $ 392 $ 515 $ 2,432 Interest rate-related instruments — MSRs hedge Mortgage banking, net (1,096) (12,622) — Foreign currency exchange forwards Capital markets, net 1,670 203 730 Commodity contracts Capital markets, net — (16) (1,316) Interest rate lock commitments (mortgage) Mortgage banking, net 353 (2,531) (7,007) Forward commitments (mortgage) Mortgage banking, net (627) (123) 2,075

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 2023
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate-Related Instruments and Foreign Exchange Forwards (“Interest and Foreign Exchange Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers and foreign exchange forwards to manage customers' exposure to fluctuating foreign exchange rates. The Corporation typically mitigates these risks by entering into equal and offsetting agreements with highly rated third-party financial institutions, though in rare circumstances the agreements are not perfectly equal and offsetting, which creates a negligible basis mismatch. The Corporation is party to master netting arrangements with some of its financial institution counterparties that create single net settlements of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest and 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 with assets and liabilities offset resulting in a net position which is further offset by any cash collateral, and is reported in other assets and accrued expenses and other liabilities on the face of the consolidated balance sheets. For disclosure purposes, the net position on the consolidated balance sheets can be further netted down by investment securities collateral received or pledged. See Note 14 for additional information on the Corporation’s derivative and hedging activities. The following table presents the interest rate and foreign exchange assets and liabilities subject to an enforceable master netting arrangement as of December 31, 2023 and 2022. The interest rate 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 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) Gross Amounts Recognized Derivative Liabilities Offset Cash Collateral Received Security Collateral Received Net Derivative assets December 31, 2023 $ 87,075 $ (18,234) $ (35,855) $ 32,985 $ (32,985) $ — December 31, 2022 63,029 (2,788) (26,898) 33,342 (30,753) 2,589 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) Gross Amounts Recognized Derivative Assets Offset Cash Collateral Pledged Security Collateral Pledged Net Derivative liabilities December 31, 2023 $ 18,767 $ (18,234) $ — $ 533 $ — $ 533 December 31, 2022 3,096 (2,788) (217) 91 — 91

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related and other commitments (see below) as well as derivative instruments (see Note 14). The following is a summary of lending-related commitments: ($ in thousands) December 31, 2023 December 31, 2022 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 11,170,147 $ 12,444,275 Commercial letters of credit (a) 3,697 3,188 Standby letters of credit (c) 212,029 270,692 (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 December 31, 2023 or 2022. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14. (c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $2 million and $3 million at December 31, 2023 and 2022, respectively, as an estimate of the fair value of these financial instruments. Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in thousands) Year Ended December 31, 2023 Year Ended December 31, 2022 Allowance for unfunded commitments Balance at beginning of period $ 38,776 $ 39,776 Provision for unfunded commitments (4,000) (1,000) Balance at end of period $ 34,776 $ 38,776 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 in other assets and accrued expenses and other liabilities on the consolidated balance sheets. The Corporation’s derivative and hedging activity is further described in Note 14. 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, 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 December 31, 2023, was $219 million, compared to $250 million at December 31, 2022, included in tax credit and other investments 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 $34 million, $34 million, and $33 million during the years ended December 31, 2023, 2022, and 2021, respectively. The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $215 million at December 31, 2023 and $246 million at December 31, 2022. The Corporation’s unfunded equity contributions relating to investments in qualified affordable housing and historic projects are recorded in accrued expenses and other liabilities on the consolidated balance sheets. The Corporation’s remaining unfunded equity contributions totaled $27 million and $40 million at December 31, 2023 and 2022, respectively. During the years ended December 31, 2023, 2022 and 2021, 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 companies through either direct investment 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 $40 million and $27 million at December 31, 2023 and 2022, respectively, included in tax credit and other investments 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. Management believes that the legal proceedings currently pending against it should not have a material adverse effect on the Corporation’s consolidated financial condition. However, in light of the uncertainties involved in such proceedings, there is no assurance that the ultimate resolution of these matters will not significantly exceed the reserves the Corporation has currently accrued or that a matter will not have material reputational or other qualitative consequences. As a result, the outcome of a particular matter may be material to the Corporation’s operating results for a particular period, depending on, among other factors, the size of the loss or liability imposed and the level of the Corporation’s income for that period. 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 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, fees and charges. 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. In recent consent orders with financial institutions, the CFPB has asserted that certain overdraft charges constitute “unfair and abusive acts and practices.” In certain instances, these financial institutions have agreed to make restitution to customers and to pay civil money penalties. Included in the practices that the CFPB has asserted are “unfair and abusive” are (1) overdraft fees on transactions that had a sufficient balance at the time authorized but then later settled with an insufficient balance (“APSN Fees”), and (2) repeat insufficient funds fees on transactions resubmitted for payment after they were initially declined (“Representment Fees”). In light of these orders, the Corporation has undertaken a review of its current and past practices regarding APSN Fees and Representment Fees. Such review could result in changes to our overdraft fee policies, which would reduce our fee income in future periods and which could also result in a decision to make remediation payments to current and past customers who incurred such fees. The Corporation’s financial results may be materially impacted in any period in which the Corporation determines to make any such remediation payments. In addition to the review described above, the Corporation received an arbitration request in July 2023 which, among other things, sought to recover APSN Fees and Representment Fees on behalf of certain current and former deposit customers of the Corporation (the "arbitration request"). After mediation of the arbitration request, a settlement in principle of $2.1 million including attorneys' fees was reached in the fourth quarter of 2023. 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. The Corporation also sells qualifying residential mortgage loans guaranteed by U.S. government agencies into GNMA pools. As a result of make whole requests, the Corporation has repurchased loans with aggregate principal balances of $5 million and $6 million for the years ended December 31, 2023 and 2022, respectively. There were no loss reimbursement and settlement claims paid for the years ended December 31, 2023, or 2022. Make whole requests since January 1, 2022 generally arose from loans originated since January 1, 2021 with such balances totaling $3.8 billion at the time of sale, consisting primarily of loans sold to GSEs. As of December 31, 2023, $3.5 billion of those loans originated since January 1, 2021 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 mortgage repurchase reserve, included in accrued expenses and other liabilities on the consolidated balance sheets, was approximately $835,000 at December 31, 2023 and $1 million at December 31, 2022. 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 December 31, 2023 and December 31, 2022, there were $15 million and $7 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 December 31, 2023 and December 31, 2022, there were $16 million and $19 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been immaterial historical losses to the Corporation.

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Parent Company Only Financial Information	Parent Company Only Financial Information Presented below are condensed financial statements for the Parent Company: Balance Sheets December 31, ($ in thousands) 2023 2022 Assets Cash and due from banks $ 22,473 $ 14,899 Interest-bearing deposits in other financial institutions 20,428 29,856 Notes and interest receivable from subsidiaries 562,640 172,066 Investments in and receivable due from subsidiaries 4,080,536 4,036,273 Other assets 48,589 48,097 Total assets $ 4,734,666 $ 4,301,191 Liabilities and Stockholders' Equity Commercial paper $ — $ 20,798 Subordinated notes, at par 550,000 250,000 Long-term funding capitalized costs and fair value hedge liability (9,114) (2,399) Total long-term funding 540,886 247,601 Accrued expenses and other liabilities 19,807 17,301 Total liabilities 560,693 285,701 Preferred equity 194,112 194,112 Common equity 3,979,861 3,821,378 Total stockholders’ equity 4,173,973 4,015,490 Total liabilities and stockholders’ equity $ 4,734,666 $ 4,301,191 Statements of Income For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Income Income from subsidiaries $ 192,559 $ 373,581 $ 361,198 Interest income on notes receivable from subsidiaries 30,363 5,632 3,247 Other income 1,175 1,262 682 Total income 224,097 380,475 365,127 Expense Interest expense on short and long-term funding 36,081 10,655 10,942 Other expense 7,352 6,118 7,330 Total expense 43,434 16,772 18,272 Income before income tax expense 180,663 363,702 346,856 Income tax (benefit) (2,292) (2,420) (4,138) Net income 182,956 366,122 350,994 Preferred stock dividends 11,500 11,500 17,111 Net income available to common equity $ 171,456 $ 354,622 $ 333,883 Statements of Cash Flows For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Cash Flows from Operating Activities Net income $ 182,956 $ 366,122 $ 350,994 Adjustments to reconcile net income to net cash provided by operating activities: (Increase) decrease in equity in undistributed net income (loss) of subsidiaries 107,441 (343,582) 28,802 Net change in other assets and accrued expenses and other liabilities (35,863) 14,159 17,102 Net cash provided by operating activities 254,534 36,699 396,898 Cash Flows from Investing Activities Net (increase) decrease in notes receivable from subsidiaries (385,000) 115,000 20,000 Net cash provided by (used in) investing activities (385,000) 115,000 20,000 Cash Flows from Financing Activities Net (decrease) in commercial paper (20,798) (13,932) (24,616) Proceeds from issuance of long-term funding 292,740 — — Proceeds from issuance of common stock for stock-based compensation plans 4,297 11,061 25,702 Redemption of preferred stock — — (164,458) Purchase of treasury stock, open market purchases — — (132,955) Purchase of treasury stock, stock-based compensation plans (6,593) (6,480) (4,847) Cash dividends on common stock (129,534) (123,137) (116,061) Cash dividends on preferred stock (11,500) (11,500) (17,111) Other — (938) — Net cash used in financing activities 128,612 (144,928) (434,346) Net increase (decrease) in cash and cash equivalents (1,854) 6,771 (17,448) Cash and cash equivalents at beginning of year 44,755 37,984 55,432 Cash and cash equivalents at end of year $ 42,901 $ 44,755 $ 37,984

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
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). See Note 1 for the Corporation’s accounting policy for fair value measurements. 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 AFS Investment Securities: 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 AFS investment securities are classified predominantly within Level 2 of the fair value hierarchy. See Note 3 for additional disclosure regarding the Corporation’s AFS 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 and other 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 3 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 - Both Designated and Not Designated as Hedging Instruments): The Corporation uses interest rate-related instruments (swaps and caps) to hedge its exposure to changes in fair value of its fixed-rate debt as well as to hedge its exposure to variability in cash flows on its floating rate assets, both due to changes in benchmark interest rates. Additionally, the Corporation also 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 14 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 December 31, 2023 and 2022, and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments for interest rate-related instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments for interest rate-related instruments in their entirety are classified within Level 2 of the fair value hierarchy. Derivative Financial Instruments (Foreign Currency Exchange Forwards - Both Designated and Not Designated as Hedging Instruments): 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 14 for additional disclosures regarding the Corporation’s foreign currency exchange forwards. For Level 3 assets and liabilities measured at fair value on a recurring basis as of December 31, 2023, the Corporation utilized the following valuation techniques and significant unobservable inputs: Mortgage Servicing Rights: The Corporation sells residential mortgage loans in the secondary market and typically retains the rights to service the loans sold. Upon sale, an MSRs asset is capitalized, which represents the then current fair value of future net cash flows expected to be realized for performing servicing activities. The Corporation has made the irrevocable election to account for its MSRs asset under the fair value measurement method. Under this methodology, changes in the fair value are recognized in earnings as they occur through mortgage banking, net on the consolidated statements of income. MSRs are not traded in active markets. A cash flow model is used to determine fair value. Key assumptions and estimates, including projected prepayment speeds, assumed servicing costs, ancillary income, costs to service delinquent loans, costs of foreclosure, and discount rates with option-adjusted spreads, used by this model are based on current market sources. Assumptions used to value MSRs are considered significant unobservable inputs. A separate third-party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults, and other relevant factors. Fair value estimates from outside sources are received periodically to corroborate the results of the valuation model. Due to the nature of the valuation inputs, MSRs are classified within Level 3 of the fair value hierarchy. See Note 5 for additional disclosure regarding the Corporation’s MSRs. 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. 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 14 for additional disclosure regarding the Corporation’s mortgage derivatives. The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of December 31, 2023 and 2022, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in thousands) Fair Value Hierarchy December 31, 2023 December 31, 2022 Assets AFS investment securities: U.S. Treasury securities Level 1 $ 35,902 $ 109,378 Agency securities Level 2 — 13,532 Obligations of state and political subdivisions (municipal securities) Level 2 91,817 230,714 Residential mortgage-related securities: FNMA/FHLMC Level 2 1,120,794 1,604,610 GNMA Level 2 2,042,675 497,596 Commercial mortgage-related securities: FNMA/FHLMC Level 2 16,937 17,142 GNMA Level 2 154,793 110,462 Asset backed securities: FFELP Level 2 133,975 151,191 SBA Level 2 1,051 4,477 Other debt securities Level 2 2,950 2,922 Total AFS investment securities Level 1 $ 35,902 $ 109,378 Total AFS investment securities Level 2 3,564,990 2,632,647 Equity securities with readily determinable fair values Level 1 6,883 5,991 Residential loans held for sale Level 2 33,011 20,383 Mortgage servicing rights, net Level 3 84,390 77,351 Interest rate-related instruments designated as hedging instruments (a) Level 2 8,075 4,349 Foreign currency exchange forwards designated as hedging instruments (a) Level 2 632 416 Interest rate-related and other instruments not designated as hedging instruments (a) Level 2 111,623 62,401 Foreign currency exchange forwards not designated as hedging instruments (a) Level 2 2,954 437 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 439 86 Liabilities Interest rate-related instruments designated as hedging instruments (a) Level 2 $ 930 $ 1,260 Foreign currency exchange forwards designated as hedging instruments (a) Level 2 2,946 972 Interest rate-related and other instruments not designated as hedging instruments (a) Level 2 195,662 251,398 Foreign currency exchange forwards not designated as hedging instruments (a) Level 2 2,746 402 Forward commitments to sell residential mortgage loans Level 3 673 46 (a) Figures are presented gross before netting. See Note 14 and Note 15 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 years ended December 31, 2023 and 2022, for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ in thousands) Interest rate lock commitments to originate residential mortgage loans held for sale Forward commitments to sell residential mortgage loans Total Balance December 31, 2021 $ 2,617 $ (30) $ 2,647 New production 10,442 (2,028) 12,470 Closed loans / settlements (913) 24,766 (25,679) Other (12,060) (22,662) 10,603 Change in mortgage derivative (2,531) 76 (2,607) Balance December 31, 2022 $ 86 $ 46 $ 40 New production $ 6,557 $ (1,816) $ 8,373 Closed loans / settlements (4,171) 2,494 (6,665) Other (2,033) (51) (1,982) Change in mortgage derivative 352 627 (274) Balance December 31, 2023 $ 439 $ 673 $ (234) 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 LOCOM, including the general classification of such instruments pursuant to the valuation hierarchy. Commercial Loans Held For Sale: 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 December 31, 2023, the Corporation utilized the following valuation techniques and significant unobservable inputs: Individually Evaluated Loans: The Corporation individually evaluates loans when a commercial loan relationship over $500,000 is in nonaccrual status or, prior to 2023, when a commercial or consumer loan relationship had its terms restructured in a TDR or when a loan met the Corporation's definition of a probable TDR. On January 1, 2023, the Corporation adopted ASU 2022-02 prospectively. As a result, loans that were restructured prior to adoption are no longer considered TDRs and are not individually evaluated. See Note 4 for additional information regarding the Corporation’s individually evaluated loans. 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 76,000 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 76,000 shares of Visa Class B to convert to 120,650 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 3 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 December 31, 2023 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 December 31, 2023: ($ in thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2022 $ 19,225 Carrying value changes 5,785 Purchases 10,011 Sales (252) Carrying value as of December 31, 2023 $ 34,769 Cumulative upward carrying value changes between January 1, 2018 and December 31, 2023 $ 24,671 Cumulative downward carrying value changes between January 1, 2018 and December 31, 2023 $ — 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: ($ in thousands) Fair Value Hierarchy Fair Value Consolidated Statements of Income Category of Adjustment Recognized on the Consolidated Statements of Income (a) December 31, 2023 Assets Individually evaluated loans (b) Level 3 $ 47,221 Provision for credit losses $ 45,709 OREO (c) Level 2 3,139 Other noninterest expense / provision for credit losses (d) 2,532 Equity securities without readily determinable fair values Level 3 24,671 Investment securities gains (losses), net 5,785 December 31, 2022 Assets Individually evaluated loans (b) Level 3 $ 23,584 Provision for credit losses $ 4,405 OREO (c) Level 2 2,196 Other noninterest expense / provision for credit losses (d) 971 Equity securities without readily determinable fair values Level 3 19,134 Investment securities gains (losses), net 5,690 (a) Includes the full year impact on the consolidated statements of income. (b) On January 1, 2023, the Corporation adopted ASU 2022-02. Under this update, TDRs were eliminated and replaced with a modified loan classification which were no longer individually evaluated. As a result, amounts reported for 2023 and forward will not be comparable to prior period reported amounts. (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. (d) When a property's value is written down at the time it is transferred to OREO, the charge off is booked to the provision for credit losses. When a property is already in OREO and subsequently written down, the charge off is booked to other noninterest expense. Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a nonrecurring basis include the fair value analysis in the goodwill impairment test as well as intangible assets and other nonfinancial long-lived assets measured at fair value for the purpose of impairment assessment. The table below presents the unobservable inputs that are readily quantifiable pertaining to Level 3 measurements: December 31, 2023 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Option adjusted spread 6% - 8% 6% Mortgage servicing rights Discounted cash flow Constant prepayment rate 1% - 100% 4% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 18% - 53% 53% Interest rate lock commitments to originate residential mortgage loans held for sale Discounted cash flow Closing ratio 31% - 100% 89% 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: December 31, 2023 December 31, 2022 ($ in thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 484,384 $ 484,384 $ 436,952 $ 436,952 Interest-bearing deposits in other financial institutions Level 1 425,089 425,089 156,693 156,693 Federal funds sold and securities purchased under agreements to resell Level 1 14,350 14,350 27,810 27,810 AFS investment securities Level 1 35,902 35,902 109,378 109,378 AFS investment securities Level 2 3,564,990 3,564,990 2,632,647 2,632,647 HTM investment securities, net Level 1 999 963 999 936 HTM investment securities, net Level 2 3,859,161 3,379,586 3,959,399 3,400,028 Equity securities with readily determinable fair values Level 1 6,883 6,883 5,991 5,991 Equity securities without readily determinable fair values (d) 10,000 10,000 — — Equity securities without readily determinable fair values Level 3 24,769 24,769 19,225 19,225 FHLB and Federal Reserve Bank stocks Level 2 229,171 229,171 295,496 295,496 Residential loans held for sale Level 2 33,011 33,011 20,383 20,383 Commercial loans held for sale Level 2 90,303 90,303 — — Loans, net Level 3 28,865,124 27,371,086 28,486,849 27,481,426 Bank and corporate owned life insurance Level 2 682,649 682,649 676,530 676,530 Mortgage servicing rights, net Level 3 84,390 84,390 77,351 77,351 Derivatives (other assets) (a) Level 2 123,284 123,284 67,603 67,603 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 439 439 86 86 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 26,130,076 $ 26,130,076 $ 27,705,996 $ 27,705,996 Brokered CDs and other time deposits (b) Level 2 7,315,973 7,315,973 1,930,158 1,930,158 Short-term funding Level 2 326,780 326,757 605,937 605,205 FHLB advances Level 2 1,940,194 1,944,600 4,319,861 4,322,264 Other long-term funding Level 2 541,269 534,983 248,071 242,151 Standby letters of credit (c) Level 2 2,157 2,157 2,881 2,881 Derivatives (accrued expenses and other liabilities) (a) Level 2 202,285 202,285 254,033 254,033 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 673 673 46 46 (a) Figures are presented gross before netting. See Note 14 and Note 15 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. (b) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (c) The commitment on standby letters of credit was $212 million and $271 million at December 31, 2023 and 2022, respectively. See Note 16 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (d) These securities are measured at fair value using Net Asset Value per share (or its equivalent) as a practical expedient.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2023
Banking and Thrift, Other Disclosure [Abstract]
Regulatory Matters	Regulatory Matters Regulatory Capital Requirements The Corporation and its subsidiary bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Corporation’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Corporation must meet specific capital guidelines that involve quantitative measures of the Corporation’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Corporation’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Corporation to maintain minimum amounts and ratios (set forth in the table below) of total and CET1 capital to risk-weighted assets, and of tier 1 capital to average assets. Management believes, as of December 31, 2023 and 2022, that the Corporation meets all capital adequacy requirements to which it is subject. For additional information on the capital requirements applicable for the Corporation and the Bank, please see Part I, Item 1. As of December 31, 2023 and 2022, the most recent notifications from the OCC and the FDIC categorized the subsidiary bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the subsidiary bank must maintain minimum ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the institution’s category. The actual capital amounts and ratios of the Corporation and its significant subsidiary are presented below. No deductions from capital were made for interest rate risk in 2023 or 2022. Actual For Capital Adequacy To Be Well Capitalized Under Prompt Corrective Action Provisions (a) ($ in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31 , 2023 Associated Banc-Corp Total capital $ 3,997,205 12.21 % $ 2,618,596 ≥ 8.00 % Tier 1 capital 3,269,050 9.99 % 1,963,947 ≥ 6.00 % CET1 3,074,938 9.39 % 1,472,960 ≥ 4.50 % Leverage 3,269,050 8.06 % 1,622,053 ≥ 4.00 % Associated Bank, N.A. Total capital $ 3,803,052 11.64 % $ 2,614,469 ≥ 8.00 % $ 3,268,086 ≥ 10.00 % Tier 1 capital 3,167,182 9.69 % 1,960,852 ≥ 6.00 % 2,614,469 ≥ 8.00 % CET1 3,167,182 9.69 % 1,470,639 ≥ 4.50 % 2,124,256 ≥ 6.50 % Leverage 3,167,182 7.82 % 1,620,970 ≥ 4.00 % 2,026,212 ≥ 5.00 % As of December 31 , 2022 Associated Banc-Corp Total capital $ 3,680,227 11.33 % $ 2,597,589 ≥ 8.00 % Tier 1 capital 3,229,690 9.95 % 1,948,192 ≥ 6.00 % CET1 3,035,578 9.35 % 1,461,144 ≥ 4.50 % Leverage 3,229,690 8.59 % 1,504,035 ≥ 4.00 % Associated Bank, N.A. Total capital $ 3,594,845 11.09 % $ 2,593,728 ≥ 8.00 % $ 3,242,160 ≥ 10.00 % Tier 1 capital 3,243,349 10.00 % 1,945,296 ≥ 6.00 % 2,593,728 ≥ 8.00 % CET1 3,243,349 10.00 % 1,458,972 ≥ 4.50 % 2,107,404 ≥ 6.50 % Leverage 3,243,349 8.63 % 1,503,666 ≥ 4.00 % 1,879,583 ≥ 5.00 % (a) Prompt corrective action provisions are not applicable at the bank holding company level.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share See Note 1 for the Corporation’s accounting policy on earnings per common share. Presented below are the calculations for basic and diluted earnings per common share: For the Years Ended December 31, ($ in thousands, except per share data) 2023 2022 2021 Net income $ 182,956 $ 366,122 $ 350,994 Preferred stock dividends (11,500) (11,500) (17,111) Net income available to common equity $ 171,456 $ 354,622 $ 333,883 Common shareholder dividends $ (128,748) $ (122,417) $ (115,212) Unvested share-based payment awards (785) (720) (849) Undistributed earnings $ 41,922 $ 231,485 $ 217,822 Undistributed earnings allocated to common shareholders $ 41,675 $ 229,995 $ 216,299 Undistributed earnings allocated to unvested share-based payment awards 247 1,490 1,523 Undistributed earnings $ 41,922 $ 231,485 $ 217,822 Basic Distributed earnings to common shareholders $ 128,748 $ 122,417 $ 115,212 Undistributed earnings allocated to common shareholders 41,675 229,995 216,299 Total common shareholders earnings, basic $ 170,424 $ 352,412 $ 331,510 Diluted Distributed earnings to common shareholders $ 128,748 $ 122,417 $ 115,212 Undistributed earnings allocated to common shareholders 41,675 229,995 216,299 Total common shareholders earnings, diluted $ 170,424 $ 352,412 $ 331,510 Weighted average common shares outstanding 149,968 149,162 150,773 Effect of dilutive common stock awards 892 1,334 1,214 Diluted weighted average common shares outstanding 150,860 150,496 151,987 Basic earnings per common share $ 1.14 $ 2.36 $ 2.20 Diluted earnings per common share $ 1.13 $ 2.34 $ 2.18 Approximately 3 million anti-dilutive common stock options were excluded from the earnings per share calculation at December 31, 2023, 2 million at December 31, 2022, and 3 million at December 31, 2021.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2023
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 Note 1, 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, primarily loans) and credits providers of funds (liabilities, primarily deposits) based on the maturity, prepayment, and/or re-pricing 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 interest income (expense) in the accompanying tables. The provision for credit losses 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 ACLL model using methodologies described in Note 1. 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, when applicable, amortization of CDIs and other intangible assets associated with acquisitions, acquisition-related costs, and asset gains on disposed business units) 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 description of each business segment is presented below. Corporate and Commercial Specialty: The Corporate and Commercial Specialty segment serves a wide range of customers including private clients, larger businesses, developers, not-for-profits, municipalities, and financial institutions by providing lending and deposit solutions as well as the support to deliver, fund, and manage such banking solutions. In addition, this segment provides a variety of investment, fiduciary, and retirement planning products and services to individuals, private clients, and small to mid-sized businesses. In serving this segment, we compete based on an in-depth understanding of our customers’ financial needs, the ability to match market competitive solutions to those needs, and the highest standards of relationship and service excellence in the delivery of these services. Delivery of services is provided through our corporate and commercial units, our CRE unit, as well as our specialized industries and commercial financial services units. Within this segment we provide the following products and services: (1) lending solutions, such as commercial loans and lines of credit, CRE financing, construction loans, letters of credit, leasing, ABL & equipment finance, and, for our larger clients, loan syndications; (2) deposit and cash management solutions such as commercial checking and interest-bearing deposit products, cash vault and night depository services, liquidity solutions, payables and receivables solutions, and information services; (3) specialized financial services such as interest rate risk management, and foreign exchange solutions; (4) fiduciary services such as administration of pension, profit-sharing and other employee benefit plans, fiduciary and corporate agency services, and institutional asset management; and (5) investable funds solutions such as savings, money market deposit accounts, IRA accounts, CDs, fixed and variable annuities, full-service, discount and online investment brokerage; investment advisory services; and trust and investment management accounts. During the first quarter of 2021, the Corporation sold its wealth management subsidiary, Whitnell. Community, Consumer, and Business: The Community, Consumer, and Business segment serves individuals, as well as small and mid-sized businesses, by providing lending and deposit solutions. In serving this segment, we compete based on providing a broad range of solutions to meet the needs of our customers in their entire financial lifecycle, convenient access to our services through multiple channels such as branches, phone based services, online and mobile banking, and a relationship based business model which assists our customers in navigating any changes and challenges in their financial circumstances. Delivery of services is provided through our various consumer banking and community banking units. Within this segment we provide the following products and services: (1) lending solutions such as residential mortgages, home equity loans and lines of credit, personal and installment loans, auto finance loans, business loans, and business lines of credit, and (2) deposit and transactional solutions such as checking, credit and debit cards, online banking and bill pay, and money transfer services. Risk Management and Shared Services: 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). Effective during the third quarter of 2022, the product and marketing functions were moved to the Risk Management and Shared Services segment from the Community, Consumer, and Business and Corporate and Commercial Specialty segments in order to centralize these functions under common leadership. Effective during the first quarter of 2022, certain support functions and a select group of banking regions were realigned into the Community, Consumer, and Business segment from the Corporate and Commercial Specialty segment. Effective during 2021, select back office support functions that specifically support Community, Consumer and Business were reorganized under that segment from the Risk Management and Shared Services segment. Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ 958,046 $ 566,566 $ 361,634 Net intersegment interest income (expense) (391,276) (103,360) 18,001 Segment net interest income 566,769 463,205 379,636 Noninterest income 136,995 145,751 165,345 Total revenue 703,764 608,956 544,980 Provision for credit losses 55,801 49,543 60,311 Noninterest expense 248,926 234,234 219,655 Income before income taxes 399,037 325,179 265,015 Income tax expense 71,766 59,000 46,906 Net income $ 327,271 $ 266,179 $ 218,109 Allocated goodwill $ 525,836 $ 525,836 $ 525,836 Community, Consumer, and Business For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ 285,175 $ 322,725 $ 289,075 Net intersegment interest income 447,100 176,164 62,376 Segment net interest income 732,276 498,889 351,451 Noninterest income 108,858 118,848 151,474 Total revenue 841,133 617,737 502,925 Provision for credit losses 28,258 20,755 20,622 Noninterest expense 435,986 417,042 401,206 Income before income taxes 376,889 179,939 81,097 Income tax expense 79,147 37,787 17,030 Net income $ 297,742 $ 142,152 $ 64,067 Allocated goodwill $ 579,156 $ 579,156 $ 579,156 Risk Management and Shared Services For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ (203,647) $ 68,031 $ 75,146 Net intersegment (expense) (55,824) (72,803) (80,378) Segment net interest income (259,471) (4,772) (5,232) Noninterest income (182,671) 17,772 15,546 Total revenue (442,142) 12,999 10,314 Provision for credit losses (1,038) (37,300) (168,944) Noninterest expense 128,770 95,787 89,063 Income (loss) before income taxes (569,873) (45,488) 90,195 Income tax expense (benefit) (127,816) (3,279) 21,377 Net income (loss) $ (442,057) $ (42,209) $ 68,818 Allocated goodwill $ — $ — $ — Consolidated Total For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ 1,039,573 $ 957,321 $ 725,855 Net intersegment interest income — — — Segment net interest income 1,039,573 957,321 725,855 Noninterest income 63,182 282,370 332,364 Total revenue 1,102,756 1,239,691 1,058,219 Provision for credit losses 83,021 32,998 (88,011) Noninterest expense 813,682 747,063 709,924 Income before income taxes 206,052 459,630 436,307 Income tax expense 23,097 93,508 85,313 Net income $ 182,956 $ 366,122 $ 350,994 Allocated goodwill $ 1,104,992 $ 1,104,992 $ 1,104,992

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2023, 2022, and 2021, respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in thousands) AFS Investment Securities Cash Flow Hedge Derivatives Defined Benefit Accumulated Balance, December 31, 2020 $ 41,325 $ — $ (28,707) $ 12,618 Other comprehensive income (loss) before reclassifications (63,714) — 25,519 (38,195) Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 16 — — 16 HTM investment securities, net, at amortized cost (a) 1,551 — — 1,551 Personnel expense — — 1,346 1,346 Other expense — — 4,594 4,594 Income tax (expense) benefit 15,557 — (7,803) 7,754 Net other comprehensive income (loss) during period (46,591) — 23,656 (22,935) Balance, December 31, 2021 $ (5,266) $ — $ (5,051) $ (10,317) Other comprehensive (loss) before reclassifications $ (250,273) $ — $ (51,745) $ (302,018) Unrealized (losses) on AFS securities transferred to HTM securities (67,604) — — (67,604) Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 1,922 — — 1,922 HTM investment securities, net, at amortized cost (a) 9,870 — — 9,870 Other assets / accrued expenses and other liabilities — 3,626 — 3,626 Interest income — (212) — (212) Personnel expense — — (325) (325) Other expense — — 658 658 Income tax (expense) benefit 78,159 (54) 13,495 91,601 Net other comprehensive income (loss) during period (227,926) 3,360 (37,917) (262,483) Balance, December 31, 2022 $ (233,192) $ 3,360 $ (42,968) $ (272,799) Other comprehensive income before reclassifications $ 41,145 $ — $ 24,091 $ 65,236 Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 64,940 — — 64,940 HTM investment securities, net, at amortized cost (a) 9,025 — — 9,025 Other assets / accrued expenses and other liabilities — (13,254) — (13,254) Interest income — 13,930 — 13,930 Personnel expense — — (326) (326) Other expense — — (29) (29) Income tax (expense) (30,560) (956) (6,304) (37,820) Net other comprehensive income (loss) during period 84,550 (280) 17,432 101,703 Balance, December 31, 2023 $ (148,641) $ 3,080 $ (25,535) $ (171,096)

Revenues (Notes)

Revenues (Notes)	12 Months Ended
	Dec. 31, 2023
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	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 For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Wealth management fees $ 82,502 $ 84,122 $ 89,854 Service charges and deposit account fees 10,907 13,240 15,880 Card-based fees (a) 1,808 1,547 1,397 Other revenue 2,044 2,964 3,208 Noninterest income (in-scope of Topic 606) $ 97,261 $ 101,873 $ 110,340 Noninterest income (out-of-scope of Topic 606) 39,734 43,878 55,004 Total noninterest income $ 136,995 $ 145,751 $ 165,345 Community, Consumer, and Business For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Service charges and deposit account fees $ 38,115 $ 49,052 $ 48,493 Card-based fees (a) 43,286 42,474 41,730 Other revenue 7,082 7,069 10,719 Noninterest income (in-scope of Topic 606) $ 88,483 $ 98,595 $ 100,942 Noninterest income (out-of-scope of Topic 606) 20,375 20,253 50,532 Total noninterest income $ 108,858 $ 118,848 $ 151,474 Risk Management and Shared Services For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Service charges and deposit account fees $ 23 $ 18 $ 32 Card-based fees (a) 28 111 (3) Other revenue 764 1,356 967 Noninterest income (in-scope of Topic 606) $ 815 $ 1,485 $ 996 Noninterest income (out-of-scope of Topic 606) (183,486) 16,286 14,550 Total noninterest income $ (182,671) $ 17,772 $ 15,546 Consolidated Total For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Wealth management fees $ 82,502 $ 84,122 $ 89,854 Service charges and deposit account fees 49,045 62,310 64,406 Card-based fees (a) 45,121 44,132 43,124 Other revenue 9,891 11,389 14,894 Noninterest income (in-scope of Topic 606) $ 186,560 $ 201,953 $ 212,278 Noninterest income (out-of-scope of Topic 606) (123,377) 80,417 120,086 Total noninterest income $ 63,182 $ 282,370 $ 332,364 (a) Certain card-based fees are out-of-scope of Topic 606. Below is a listing of performance obligations for the Corporation's main revenue streams: Revenue Stream Noninterest Income In-Scope of Topic 606 Service charges and deposit account fees Service charges and deposit account fees consist of monthly service fees (i.e. business analyzed 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 and deposit account fees 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 the 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 and advisory fees (b) Brokerage and advisory 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. Payment for these services is 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 and advisory fees are included in wealth management fees.

Recent Developments Recent Deve

Recent Developments Recent Developments Details (Notes)	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Recent Developments	Recent Developments On January 30, 2024, the Corporation's Board of Directors declared a regular quarterly cash dividend of $0.22 per common share, payable on March 15, 2024 to shareholders of record at the close of business on March 1, 2024. The Board of Directors also declared a regular quarterly cash dividend of $0.3671875 per depositary share on Associated's 5.875% Series E Perpetual Preferred Stock, payable on March 15, 2024 to shareholders of record at the close of business on March 1, 2024. The Board of Directors also declared a regular quarterly cash dividend of $0.3515625 per depositary share on Associated's 5.625% Series F Perpetual Preferred Stock, payable on March 15, 2024 to shareholders of record at the close of business on March 1, 2024.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Business and Basis of Financial Statement Presentation	Business Associated Banc-Corp is a bank holding company headquartered in Wisconsin. The Corporation provides a full range of banking and related financial services to consumer and commercial customers through its network of bank and nonbank subsidiaries. The Corporation is subject to competition from other financial and non-financial institutions that offer similar or competing products and services. The Corporation is regulated by federal and state agencies and is subject to periodic examinations by those agencies. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Parent Company and its subsidiaries. Investments in unconsolidated entities (none of which are considered to be variable interest entities in which the Corporation is the primary beneficiary) are accounted for using the cost method of accounting when the Corporation has determined that the cost method is appropriate. Investments not meeting the criteria for cost method accounting are accounted for using the equity method of accounting. Investments in unconsolidated entities are included in tax credit and other investments on the consolidated balance sheets, and the Corporation’s share of income or loss is recorded in other noninterest income, while distributions in excess of the investment are recorded in asset gains, net. All significant intercompany balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. The determination of the ACLL is particularly susceptible to significant change. 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.
Investment Securities	Investment Securities Securities are classified as HTM, AFS, or equity investments on the consolidated balance sheets at the time of purchase. Investment securities classified as HTM, which management has the positive intent and ability to hold to maturity, are reported at amortized cost. Investment securities classified as AFS are intended to be held for an indefinite period of time. These securities are carried at fair value and unrealized gains and losses, net of related deferred income taxes, are included in stockholders' equity as a separate component of OCI. Investment securities classified as equity securities are carried at fair value with changes in fair value immediately reflected in the consolidated statements of income. Any decision to sell AFS securities would be based on various factors, including, but not limited to, asset/liability management strategies, changes in interest rates or prepayment risks, liquidity needs, or regulatory capital considerations. Realized gains or losses on investment security sales (using specific identification method) are included in investment securities gains (losses), net, on the consolidated statements of income. Premiums and discounts are amortized or accreted into interest income over the estimated life (earlier of call date, maturity, or estimated life) of the related security, using a prospective method that approximates level yield. In certain situations, management may elect to transfer certain investment securities from the AFS classification to the HTM classification. In such cases, the investment securities are reclassified at fair value at the time of transfer. Any unrealized gain or loss included in accumulated other comprehensive income (loss) at the time of transfer is retained therein and amortized over the remaining life of the investment security as an adjustment to yield. Management measures expected credit losses on HTM securities on a collective basis by major security type. Accrued interest receivable on HTM securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts and is included in HTM investment securities, net, at amortized cost on the consolidated balance sheets. For AFS securities, the Corporation evaluates whether any decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses on investments is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses on investments is recognized in OCI. Changes in the allowance for credit losses on investments are recorded as provision for, or reversal of, credit loss expense. Losses are charged against the allowance when management believes the AFS security is uncollectible or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on AFS securities is excluded from the estimate of credit losses. See Note 3 for additional information on investment securities.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank Stocks	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. See Note 3 for additional information on the FHLB and Federal Reserve Bank Stocks.
Loans Held for Sale	Loans Held for Sale 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 on 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. Commercial Loans Held for Sale: Commercial loans held for sale are carried at LOCOM. The estimated fair value is based on a discounted cash flow analysis.
Loans	Loans Management has the ability and intention to hold certain loans for the foreseeable future, until maturity, or pay-off. These loans are reported at their outstanding principal balances, net of any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the effective interest method. An ACLL is established for estimated credit losses in the loan portfolio. See Allowance for Credit Losses on Loans below for further policy discussion. See Note 4 for additional information on loans. Nonaccrual Loans: Management considers a loan to be nonaccrual when it believes it will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. The accrual of interest income for commercial loans is discontinued when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due. The accrual of interest income for consumer loans is discontinued when loans reach specific delinquency levels. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on a nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal. The determination as to the ultimate collectability of the loan's remaining recorded investment must be supported by a current, well documented credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months. See Note 4 for additional information on nonaccrual loans.
Troubled Debt Restructurings (Restructured Loans)	Troubled Debt Restructurings (“Restructured Loans”) : Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. As a result of the issuance of ASU 2022-02, any loans restructured prior to January 2023 were considered TDRs, but that designation was eliminated prospectively, resulting in comparable periods no longer being comparable. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. See Note 4 for additional information on restructured loans.
Allowance for Loan Losses	Allowance for Credit Losses on Loans: The allowance for loan losses is a reserve for estimated lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimate of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flow of these loans. Actual credit losses, net of recoveries, are deducted from the allowance for loan losses. A provision for credit losses, which is a charge against earnings, is recorded to bring the allowance for loan losses to a level that, in management’s judgment, is appropriate to absorb the expected lifetime losses in the loan portfolio. The Corporation applies a methodology that is designed to assess the appropriateness of the allowance for loan losses within the Corporation's loan segmentation. The methodology also focuses on the evaluation of several factors, including but not limited to: evaluation of facts and issues related to specific loans, management’s ongoing review and grading of the loan portfolio using a dual risk rating system consisting of probability of default and loss given default models, which are based on loan grades for commercial loans and credit reports for consumer loans applied based on portfolio segmentation leveraging industry breakouts in commercial and industrial and property types in CRE for commercial loans and loan types for consumer loans, consideration of historical loan loss and delinquency experience on each portfolio category, trends in past due and nonaccrual loans, the level of potential problem loans, the risk characteristics of the various classifications of loans, changes in the size and character of the loan portfolio, concentrations of loans to specific borrowers or industries, existing economic conditions and economic forecasts, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect potential credit losses. The Corporation utilizes the Moody's Baseline economic forecast in the allowance model and applies that forecast over a reasonable and supportable period with reversion to historical losses. For additional detail on the reasonable and supportable period and reversion inputs, see Note 4. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flows of the loan. Because each of the criteria used is subject to change, the analysis of the allowance for loan losses is not necessarily indicative of the trend of future loan losses in any particular loan category. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio. Management individually analyzes loans that do not share similar risk characteristics to other loans in the portfolio. Management has determined that commercial loan relationships over $500,000 that have nonaccrual status meet this definition. Probable TDRs are loans the Corporation has reviewed individually to determine whether there is a high likelihood that the loans will default and will require modification in the near future. Probable TDRs are classified as Pass, Special Mention, Potential Problem or Nonaccrual within the Corporation's credit quality analysis depending on the specific circumstances surrounding the individual credits. Accrued interest receivable on loans is excluded from the estimate of credit losses. The ACLL attributable to the loan is allocated based on management’s estimate of the borrower’s ability to repay the loan given the availability of collateral, other sources of cash flows, as well as evaluation of legal options available to the Corporation. The amount of expected loan loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the fair value of the underlying collateral less applicable selling costs, or the observable market price of the loan. If foreclosure is probable or the loan is collateral dependent, impairment is measured using the fair value of the loan’s collateral, less costs to sell. Large groups of homogeneous loans, such as residential mortgage, home equity, auto finance, and other consumer, are collectively evaluated for impairment. The allowance for unfunded commitments leverages the same methodology utilized to measure the allowance for loan losses. The Corporation estimates expected credit losses over the contractual period in which the Corporation is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Corporation. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. See Note 4 for additional information on the ACLL and Note 16 for additional information on the allowance for unfunded commitments. A portion of the ACLL is comprised of adjustments for qualitative factors not reflected in the quantitative model. Management believes that the level of the ACLL is appropriate. While management uses currently available information to recognize losses on loans, future adjustments to the ACLL may be necessary based on newly received appraisals, updated commercial customer financial statements, rapidly deteriorating cash flow, and changes in economic conditions that affect our customers. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Corporation’s ACLL. Such agencies may require additions to the ACLL or may require that certain loan balances be charged off or downgraded into criticized loan categories when their credit evaluations differ from those of management based on their judgments about information available to them at the time of their examinations. See Loans above for further policy discussion and see Note 4 for additional information on the allowance for loan losses.
Other Real Estate Owned	OREO OREO is included in other assets on the consolidated balance sheets and is comprised of property acquired through a foreclosure proceeding or acceptance of a deed-in-lieu of foreclosure, and loans classified as in-substance foreclosure. OREO is recorded at the lower of the book value or fair value of the underlying property collateral, less estimated selling costs. This fair value becomes the new cost basis for the foreclosed asset. The initial write-down, if any, will be recorded as a charge off against the allowance for loan losses. Any subsequent write-downs to reflect current fair value, as well as gains and losses on disposition and revenues and expenses incurred in maintaining such properties, are expensed as incurred. OREO also includes bank premises formerly but no longer used for banking, property originally acquired for future expansion but no longer intended to be used for that purpose, and property currently held for sale. Banking premises are transferred at the lower of carrying value or fair value, less estimated selling costs and any write-down is expensed as incurred.
Premises and Equipment and Software	Premises and Equipment and Software Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed on the straight-line method over the estimated useful lives of the related assets or the lease term. Maintenance and repairs are charged to expense as incurred, while additions or major improvements are capitalized and depreciated over the estimated useful lives. Leasehold improvements are amortized on a straight-line basis over the lesser of the lease terms, including extension options which the Corporation has determined are reasonably certain to be exercised, or the estimated useful lives of the improvements. Software, included in other assets on the consolidated balance sheets, is amortized on a straight-line basis over the contract terms or the estimated useful life of the software. See Note 6 for additional information on premises and equipment.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill and Other Intangible Assets: The excess of the cost of an acquisition over the fair value of the net assets acquired consists primarily of goodwill and CDIs. CDIs have estimated finite lives and are amortized on a straight-line basis to expense over a 10-year period. The Corporation reviews long-lived assets and certain identifiable intangibles for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, in which case an impairment charge would be recorded. Goodwill is evaluated for impairment on an annual basis, or whenever events or changes in circumstances indicate the fair value of a reporting unit is below its carrying amount. The impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired. If the carrying value of a reporting unit exceeds its calculated fair value, an impairment charge is assessed, limited to the amount of goodwill allocated to that reporting unit. See Note 5 for additional information on goodwill and other intangible assets.
Mortgage Servicing Rights	Mortgage Servicing Rights : The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Upon sale of loans, MSRs assets are capitalized and recorded at the current fair value of future net cash flows expected to be realized for performing servicing activities. The Corporation has made the irrevocable election to account for its MSRs asset under the fair value measurement method. Under this methodology, changes in the fair value are recognized in earnings as they occur through mortgage banking, net on the consolidated statements of income. MSRs are not traded in active markets. A cash flow model is used to determine fair value. Key assumptions and estimates, including projected prepayment speeds, assumed servicing costs, ancillary income, costs to service delinquent loans, costs of foreclosure, and discount rates with option-adjusted spreads, used by this model are based on current market sources. Assumptions used to value MSRs are considered significant unobservable inputs. A separate third-party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults and other relevant factors. Fair value estimates from outside sources are received periodically to corroborate the results of the valuation model. See Note 5 for additional information on MSRs. Prior to January 1, 2022 and the irrevocable election to account for MSRs under fair value, upon sale of loans, MSRs assets were capitalized and recorded at the current fair value of future net cash flows expected to be realized for performing servicing activities. MSRs, when purchased, are initially recorded at fair value. As the Corporation had not elected to subsequently measure any class of servicing assets under the fair value measurement method, the Corporation followed the amortization method. MSRs were amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date. MSRs were carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value, on the consolidated balance sheets. The Corporation periodically evaluated its MSRs asset for impairment. Impairment was 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 MSRs asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the MSRs asset generally increases, requiring less valuation reserve. A valuation allowance was established, through a charge to earnings, to the extent the amortized cost of the MSRs exceeded the estimated fair value by stratification. If it was later determined that all or a portion of the temporary impairment no longer existed for a stratification, the valuation was reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability was considered remote when considering interest rates and loan pay off activity) was recognized as a write-down of the MSRs asset and the related valuation allowance (to the extent a valuation allowance was available) and then against earnings. A direct write-down permanently reduces the carrying value of the MSRs asset and valuation allowance, precluding subsequent recoveries. See Note 5 for additional information on MSRs.
Income Taxes	Income Taxes Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes, which arise principally from temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities, are included in the amounts provided for income taxes. In assessing the realizability of DTAs, management considers whether it is more likely than not that some portion or all of the DTAs will not be realized. The ultimate realization of DTAs is dependent upon the generation of future taxable income and tax planning strategies which will create taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, the amount of taxes paid in available carryback years, projected future taxable income, and, if necessary, tax planning strategies in making this assessment. The Corporation files a consolidated federal income tax return and separate or combined state income tax returns. Accordingly, amounts equal to tax benefits of those subsidiaries having taxable federal or state losses or credits are offset by other subsidiaries that incur federal or state tax liabilities. It is the Corporation’s policy to provide for uncertainty in income taxes as a part of income tax expense based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. To the extent the Corporation prevails in matters for which a liability for an unrecognized tax benefit was established or is required to pay amounts in excess of the liability established, the Corporation’s effective tax rate in a given financial statement period may be impacted. See Note 13 for additional information on income taxes.
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. Changes in the fair value are 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. For a derivative designated as a cash flow hedge, 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 capital markets, net on the consolidated statements of income. The free-standing derivative instruments included: interest rate risk management, foreign currency exchange solutions, and until early 2022, commodity hedging. The Corporation is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts fail to fulfill contractual obligations. If a counterparty fails to perform, the Corporation's 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 and investment securities. Federal regulations require the Corporation to clear and compound SOFR 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 and the London Clearing House 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. The Corporation applied the shortcut method of accounting for certain derivatives that are designated as fair value hedges. This method permits the assumption of perfect effectiveness. The gains or losses on the derivative, and the offsetting losses or gains on the hedged item attributable to the hedged risk, are recognized in interest expense. These items, along with the net interest from the derivative, are reported in the same income statement line as the fixed-rate debt expense. To assess effectiveness of the foreign currency exchange forward contracts that are designated as fair value hedges, the Corporation has elected to utilize the critical terms match method. Under the critical terms match method, if the hedging relationship meets certain criteria, it allows the Corporation to assume that the hedging relationship is perfectly effective, eliminating the quantitative aspect of assessing effectiveness. 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 capital markets, net. To assess effectiveness of interest rate swaps that are designated as cash flow hedges, the Corporation performs a quantitative analysis using a period by period regression method. When the relationship between the hedged item and hedging instrument is highly effective at achieving offsetting changes in cash flows attributable to the hedged risk, changes in the fair value of these cash flow hedges are recorded in accumulated other comprehensive income (loss) and are subsequently reclassified to interest income as interest payments are made on such variable rate loans. See Note 14 for additional information on derivatives and hedging activities.
Securities Sold Under Agreement to Repurchase	Securities Sold Under Agreement to Repurchase 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. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings 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) 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 obligation to repurchase the securities is reflected as a liability within federal funds purchased and securities sold under agreements to repurchase on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts. See Note 9 for additional information on repurchase agreements.
Retirement Plan	Retirement Plans The funded status of the retirement plans is recognized as an asset or liability on the consolidated balance sheets and changes in that funded status are recognized in the year in which the changes occur through OCI. Plan assets and benefit obligations are measured as of fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Corporation monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated. See Note 12 for additional information on the Corporation’s retirement plans.
Stock-Based Compensation	Stock-Based Compensation The fair value of restricted common stock awards is their fair market value on the date of grant. 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. 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. 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 on the consolidated statements of income. See Note 11 for additional information on stock-based compensation.
Comprehensive Income	Comprehensive Income Comprehensive income includes all changes in stockholders’ equity during a period, except those resulting from transactions with stockholders. In addition to net income, other components of the Corporation’s comprehensive income include the after tax effect of changes in net unrealized gain/loss on AFS securities, changes in unrealized gain/loss on cash flow hedge derivatives, and changes in net actuarial gain/loss on defined benefit pension and postretirement plans. Comprehensive income is reported on the accompanying consolidated statements of changes in stockholder’s equity and consolidated statements of comprehensive income. See Note 22 for additional information on accumulated other comprehensive income (loss).
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). As there is no active market for many of the Corporation’s financial instruments, estimates are made using discounted cash flow or other valuation techniques. Inputs into the valuation methods are subjective in nature, involve uncertainties, and require significant judgment and therefore cannot be determined with precision. Accordingly, the derived fair value estimates presented herein are not necessarily indicative of the amounts the Corporation could realize in a current market exchange. Assets and liabilities are categorized into three levels based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy in which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Corporation’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. See Note 18 for additional information on fair value measurements. Below is a brief description of each fair value level. Level 1 — Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Corporation has the ability to access. Level 2 — Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 3 — Level 3 inputs are unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity.
Cash and Cash Equivalents	Cash and Cash Equivalents For purposes of the consolidated statements of cash flows, cash and cash equivalents are considered to include cash and due from banks, interest-bearing deposits in other financial institutions, and federal funds sold and securities purchased under agreements to resell.
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. See Note 20 for additional information on earnings per common share.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2022-02 Financial Instruments-Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures The FASB issued these amendments to eliminate accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables-Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty, and to require that an entity disclose current-period gross writeoffs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments-Credit Losses-Measured at Amortized Cost. The amendments in this Update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, and should be applied prospectively, except as provided in the next sentence. For the transition method related to the recognition and measurement of TDRs, an entity has the option to apply a modified retrospective transition method, resulting in a cumulative-effect adjustment to retained earnings in the period of adoption. Early adoption is permitted if an entity has adopted the amendments in Update 2016-03, including adoption in an interim period. 1st Quarter 2023 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity, but resulted in additional disclosure requirements related to gross charge offs by vintage year and the removal of TDR disclosures, replaced by additional disclosures on the types of modifications of loans to borrowers experiencing financial difficulties. The Corporation has adopted this update prospectively. Future Accounting Pronouncements The expected impact of applicable material accounting pronouncements recently issued or proposed but not yet required to be adopted are discussed in the table below. To the extent that the adoption of new accounting standards materially affects the Corporation's financial condition, results of operations, liquidity or disclosures, the impacts are discussed in the applicable sections of this financial review. Standard Description Date of adoption Effect on financial statements ASU 2023-02 Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method The amendments in this update permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. A reporting entity may make an accounting policy election to apply the proportional amortization method on a tax-credit-program-by-tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. The amendments in this update also remove certain guidance for Qualified Affordable Housing Project investments and require the application of the delayed equity contribution guidance to all tax equity investments. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and must be applied on either a modified retrospective or a retrospective basis. Early adoption is permitted in any interim period, however if adopted in an interim period the entity shall adopt the amendments in this update as of the beginning of the fiscal year that includes the interim period. 1st Quarter 2024 Adoption of this amendment is not expected to have a material impact on the Corporation's current results of operation, financial position, liquidity or disclosures. ASU 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures The amendments in this update improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. The amendments in this update also do not change how a public entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. Fiscal year 2024 and interim periods beginning in 1st quarter 2025 The Corporation is currently evaluating the impact on its results of operation, financial position, liquidity, and disclosures. ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures The amendments in this update address investor requests for more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. This update also includes certain other amendments to improve the effectiveness of income tax disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2024 and are to be applied on a prospective basis. Early adoption is permitted. 1st Quarter 2025 The Corporation is currently evaluating the impact on its disclosures.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of AFS and HTM securities at December 31, 2023 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities U.S. Treasury securities $ 39,984 $ — $ (4,083) $ 35,902 Obligations of state and political subdivisions (municipal securities) 94,008 23 (2,214) 91,817 Residential mortgage-related securities: FNMA/FHLMC 1,274,052 294 (153,552) 1,120,794 GNMA 2,021,242 24,254 (2,822) 2,042,675 Commercial mortgage-related securities: FNMA/FHLMC 18,691 — (1,755) 16,937 GNMA 161,928 — (7,135) 154,793 Asset backed securities: FFELP 135,832 5 (1,862) 133,975 SBA 1,077 2 (28) 1,051 Other debt securities 3,000 — (50) 2,950 Total AFS investment securities $ 3,749,814 $ 24,579 $ (173,501) $ 3,600,892 HTM investment securities U.S. Treasury securities $ 999 $ — $ (36) $ 963 Obligations of state and political subdivisions (municipal securities) 1,682,473 5,638 (134,053) 1,554,059 Residential mortgage-related securities: FNMA/FHLMC 941,973 27,007 (164,587) 804,393 GNMA 48,979 92 (2,901) 46,170 Private-label 345,083 9,796 (65,372) 289,507 Commercial mortgage-related securities: FNMA/FHLMC 780,995 12,699 (160,781) 632,914 GNMA 59,733 386 (7,500) 52,619 Total HTM investment securities $ 3,860,235 $ 55,619 $ (535,230) $ 3,380,624 The amortized cost and fair values of AFS and HTM securities at December 31, 2022 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities U.S. Treasury securities $ 124,441 $ — $ (15,063) $ 109,378 Agency securities 15,000 — (1,468) 13,532 Obligations of state and political subdivisions (municipal securities) 235,693 96 (5,074) 230,714 Residential mortgage-related securities: FNMA/FHLMC 1,820,642 404 (216,436) 1,604,610 GNMA 502,537 314 (5,255) 497,596 Commercial mortgage-related securities: FNMA/FHLMC 19,038 — (1,896) 17,142 GNMA 115,031 — (4,569) 110,462 Asset backed securities: FFELP 157,138 — (5,947) 151,191 SBA 4,512 15 (51) 4,477 Other debt securities 3,000 — (78) 2,922 Total AFS investment securities $ 2,997,032 $ 830 $ (255,837) $ 2,742,025 HTM investment securities U.S. Treasury securities $ 999 $ — $ (62) $ 936 Obligations of state and political subdivisions (municipal securities) 1,732,351 1,994 (182,697) 1,551,647 Residential mortgage-related securities: FNMA/FHLMC 961,231 31,301 (175,760) 816,771 GNMA 52,979 85 (3,436) 49,628 Private-label 364,728 11,697 (72,920) 303,505 Commercial mortgage-related securities: FNMA/FHLMC 778,796 15,324 (178,281) 615,839 GNMA 69,369 577 (7,254) 62,691 Total HTM investment securities $ 3,960,451 $ 60,978 $ (620,411) $ 3,401,018
Investment securities held to maturity	Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of AFS and HTM securities at December 31, 2023 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities U.S. Treasury securities $ 39,984 $ — $ (4,083) $ 35,902 Obligations of state and political subdivisions (municipal securities) 94,008 23 (2,214) 91,817 Residential mortgage-related securities: FNMA/FHLMC 1,274,052 294 (153,552) 1,120,794 GNMA 2,021,242 24,254 (2,822) 2,042,675 Commercial mortgage-related securities: FNMA/FHLMC 18,691 — (1,755) 16,937 GNMA 161,928 — (7,135) 154,793 Asset backed securities: FFELP 135,832 5 (1,862) 133,975 SBA 1,077 2 (28) 1,051 Other debt securities 3,000 — (50) 2,950 Total AFS investment securities $ 3,749,814 $ 24,579 $ (173,501) $ 3,600,892 HTM investment securities U.S. Treasury securities $ 999 $ — $ (36) $ 963 Obligations of state and political subdivisions (municipal securities) 1,682,473 5,638 (134,053) 1,554,059 Residential mortgage-related securities: FNMA/FHLMC 941,973 27,007 (164,587) 804,393 GNMA 48,979 92 (2,901) 46,170 Private-label 345,083 9,796 (65,372) 289,507 Commercial mortgage-related securities: FNMA/FHLMC 780,995 12,699 (160,781) 632,914 GNMA 59,733 386 (7,500) 52,619 Total HTM investment securities $ 3,860,235 $ 55,619 $ (535,230) $ 3,380,624 The amortized cost and fair values of AFS and HTM securities at December 31, 2022 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities U.S. Treasury securities $ 124,441 $ — $ (15,063) $ 109,378 Agency securities 15,000 — (1,468) 13,532 Obligations of state and political subdivisions (municipal securities) 235,693 96 (5,074) 230,714 Residential mortgage-related securities: FNMA/FHLMC 1,820,642 404 (216,436) 1,604,610 GNMA 502,537 314 (5,255) 497,596 Commercial mortgage-related securities: FNMA/FHLMC 19,038 — (1,896) 17,142 GNMA 115,031 — (4,569) 110,462 Asset backed securities: FFELP 157,138 — (5,947) 151,191 SBA 4,512 15 (51) 4,477 Other debt securities 3,000 — (78) 2,922 Total AFS investment securities $ 2,997,032 $ 830 $ (255,837) $ 2,742,025 HTM investment securities U.S. Treasury securities $ 999 $ — $ (62) $ 936 Obligations of state and political subdivisions (municipal securities) 1,732,351 1,994 (182,697) 1,551,647 Residential mortgage-related securities: FNMA/FHLMC 961,231 31,301 (175,760) 816,771 GNMA 52,979 85 (3,436) 49,628 Private-label 364,728 11,697 (72,920) 303,505 Commercial mortgage-related securities: FNMA/FHLMC 778,796 15,324 (178,281) 615,839 GNMA 69,369 577 (7,254) 62,691 Total HTM investment securities $ 3,960,451 $ 60,978 $ (620,411) $ 3,401,018
Amortized cost and fair values of investment securities available for sale and held to maturity by contractual maturity	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 AFS and HTM securities at December 31, 2023, are shown below: AFS HTM ($ in thousands) Amortized Fair Amortized Fair Due in one year or less $ 2,395 $ 2,372 $ 6,099 $ 6,096 Due after one year through five years 42,606 38,464 52,391 52,328 Due after five years through ten years 64,728 62,839 157,279 153,795 Due after ten years 27,263 26,993 1,467,704 1,342,803 Total debt securities 136,992 130,669 1,683,472 1,555,022 Residential mortgage-related securities: FNMA/FHLMC 1,274,052 1,120,794 941,973 804,393 GNMA 2,021,242 2,042,675 48,979 46,170 Private-label — — 345,083 289,507 Commercial mortgage-related securities: FNMA/FHLMC 18,691 16,937 780,995 632,914 GNMA 161,928 154,793 59,733 52,619 Asset backed securities: FFELP 135,832 133,975 — — SBA 1,077 1,051 — — Total investment securities $ 3,749,814 $ 3,600,892 $ 3,860,235 $ 3,380,624 Ratio of fair value to amortized cost 96.0 % 87.6 %
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]	On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2023: ($ in thousands) AAA AA A Not Rated Total U.S. Treasury securities $ 999 $ — $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 760,329 915,303 5,687 1,155 1,682,473 Residential mortgage-related securities: FNMA/FHLMC 941,973 — — — 941,973 GNMA 48,979 — — — 48,979 Private-label 345,083 — — — 345,083 Commercial mortgage-related securities: FNMA/FHLMC 780,995 — — — 780,995 GNMA 59,733 — — — 59,733 Total HTM securities $ 2,938,090 $ 915,303 $ 5,687 $ 1,155 $ 3,860,235 The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2022: ($ in thousands) AAA AA A Not Rated Total U.S. Treasury securities $ 999 $ — $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 806,529 917,059 7,604 1,158 1,732,351 Residential mortgage-related securities: FNMA/FHLMC 961,231 — — — 961,231 GNMA 52,979 — — — 52,979 Private-label 364,728 — — — 364,728 Commercial mortgage-related securities: FNMA/FHLMC 778,796 — — — 778,796 GNMA 69,369 — — — 69,369 Total HTM securities $ 3,034,630 $ 917,059 $ 7,604 $ 1,158 $ 3,960,451
Realized gains and losses and proceeds from sale	The following table summarizes gross realized gains and losses on AFS securities, the gain on sale and net write-up of equity securities, and proceeds from the sale of AFS investment securities for each of the three years ended December 31 shown below: ($ in thousands) 2023 2022 2021 Gross realized gains on AFS securities $ 83 $ 21 $ 421 Gross realized (losses) on AFS securities (65,022) (1,943) (437) Gain on sale and net write-up of equity securities 6,037 5,668 — Investment securities gains (losses), net $ (58,903) $ 3,746 $ (16) Proceeds from sales of AFS investment securities $ 715,066 $ 110,177 $ 158,708
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 AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2023: Less than 12 months 12 months or more Total ($ in thousands) Number Unrealized Fair Number Unrealized Fair Unrealized (Losses) Fair AFS investment securities U.S. Treasury securities — $ — $ — 1 $ (4,083) $ 35,902 $ (4,083) $ 35,902 Obligations of state and political subdivisions (municipal securities) 41 (347) 23,762 92 (1,867) 53,022 (2,214) 76,784 Residential mortgage-related securities: FNMA/FHLMC 18 (333) 22,870 71 (153,219) 1,080,337 (153,552) 1,103,207 GNMA 13 (924) 156,847 5 (1,898) 26,643 (2,822) 183,490 Commercial mortgage-related securities: FNMA/FHLMC — — — 1 (1,755) 16,937 (1,755) 16,937 GNMA 9 (3,160) 103,055 22 (3,975) 51,738 (7,135) 154,793 Asset backed securities: FFELP — — — 14 (1,862) 125,339 (1,862) 125,339 SBA — — — 5 (28) 761 (28) 761 Other debt securities 1 (9) 991 2 (42) 1,958 (50) 2,950 Total 82 $ (4,773) $ 307,527 213 $ (168,728) $ 1,392,635 $ (173,501) $ 1,700,162 HTM investment securities U.S. Treasury securities — $ — $ — 1 $ (36) $ 963 $ (36) $ 963 Obligations of state and political subdivisions (municipal securities) 182 (1,535) 180,270 537 (132,518) 792,940 (134,053) 973,210 Residential mortgage-related securities: FNMA/FHLMC 20 (511) 30,323 94 (164,076) 771,042 (164,587) 801,365 GNMA 2 (17) 2,128 78 (2,884) 34,626 (2,901) 36,754 Private-label — — — 18 (65,372) 289,507 (65,372) 289,507 Commercial mortgage-related securities: FNMA/FHLMC 1 (121) 8,144 44 (160,660) 624,770 (160,781) 632,914 GNMA — — — 13 (7,500) 52,619 (7,500) 52,619 Total 205 $ (2,184) $ 220,865 785 $ (533,046) $ 2,566,468 $ (535,230) $ 2,787,333 For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2022: Less than 12 months 12 months or more Total ($ in thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair AFS investment securities U.S. Treasury securities — $ — $ — 7 $ (15,063) $ 109,378 $ (15,063) $ 109,378 Agency securities — — — 1 (1,468) 13,532 (1,468) 13,532 Obligations of state and political subdivisions (municipal securities) 358 (5,066) 201,260 4 (8) 1,916 (5,074) 203,176 Residential mortgage-related securities: FNMA/FHLMC 24 (31,266) 260,986 84 (185,170) 1,321,420 (216,436) 1,582,406 GNMA 23 (4,415) 220,276 2 (840) 11,096 (5,255) 231,372 Commercial mortgage-related securities: FNMA/FHLMC 1 (1,896) 17,142 — — — (1,896) 17,142 GNMA 33 (3,920) 101,036 4 (649) 9,426 (4,569) 110,462 Asset backed securities: FFELP 3 (1,668) 44,304 12 (4,278) 106,887 (5,947) 151,191 SBA 2 (1) 417 6 (50) 2,057 (51) 2,474 Other debt securities 2 (30) 1,970 1 (49) 951 (78) 2,922 Total 446 $ (48,263) $ 847,391 121 $ (207,575) $ 1,576,665 $ (255,837) $ 2,424,055 HTM investment securities U.S. Treasury securities 1 $ (62) $ 936 — $ — $ — $ (62) $ 936 Obligations of state and political subdivisions (municipal securities) 771 (96,282) 1,079,216 156 (86,415) 231,022 (182,697) 1,310,238 Residential mortgage-related securities: FNMA/FHLMC 79 (18,925) 143,201 22 (156,836) 671,570 (175,760) 814,770 GNMA 81 (3,436) 44,476 — — — (3,436) 44,476 Private-label 3 (9,509) 58,733 15 (63,411) 244,772 (72,920) 303,505 Commercial mortgage-related securities: FNMA/FHLMC 4 (3,814) 20,338 39 (174,467) 576,911 (178,281) 597,249 GNMA 8 (2,528) 34,612 6 (4,726) 28,080 (7,254) 62,691 Total 947 $ (134,556) $ 1,381,511 238 $ (485,855) $ 1,752,354 $ (620,411) $ 3,133,865

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Loan composition	The period end loan composition was as follows: ($ in thousands) Dec 31, 2023 Dec 31, 2022 Commercial and industrial $ 9,731,555 $ 9,759,454 Commercial real estate - owner occupied 1,061,700 991,722 Commercial and business lending 10,793,255 10,751,176 Commercial real estate - investor 5,124,245 5,080,344 Real estate construction 2,271,398 2,155,222 Commercial real estate lending 7,395,644 7,235,565 Total commercial 18,188,898 17,986,742 Residential mortgage 7,864,891 8,511,550 Auto finance 2,256,162 1,382,073 Home equity 628,526 624,353 Other consumer 277,740 294,851 Total consumer 11,027,319 10,812,828 Total loans $ 29,216,218 $ 28,799,569
Loans to Related Parties	The Corporation has granted loans to its directors, executive officers, or their related interests. These loans were made on substantially the same terms, including rates and collateral, as those prevailing at the time for comparable transactions with other unrelated customers, and do not involve more than a normal risk of collection. These loans to related parties are summarized below: ($ in thousands) 2023 2022 Balance at beginning of year $ 3,376 $ 45,245 New loans 2,564 2,656 Repayments (253) (1,416) Change due to status of executive officers and directors (280) (43,110) Balance at end of year $ 5,406 $ 3,376
Loans, Credit Quality Indicator by Vintage Year	The following table presents loans by credit quality indicator by origination year at December 31, 2023: Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2023 2022 2021 2020 2019 Prior Total Commercial and industrial: Risk rating: Pass $ 1,380 $ 1,693,629 $ 1,736,617 $ 2,877,173 $ 1,824,362 $ 398,046 $ 383,695 $ 449,006 $ 9,362,529 Special mention — 21,779 4,017 46,610 8,525 3,529 — 25,341 109,801 Potential problem 804 81,543 10,515 39,748 47,279 17,732 94 291 197,202 Nonaccrual 6,414 — 13,317 14,188 33,891 627 — — 62,022 Commercial and industrial $ 8,598 $ 1,796,951 $ 1,764,466 $ 2,977,719 $ 1,914,057 $ 419,934 $ 383,789 $ 474,638 $ 9,731,555 Commercial real estate - owner occupied: Risk rating: Pass $ — $ 15,393 $ 204,039 $ 188,003 $ 239,218 $ 136,535 $ 135,730 $ 92,339 $ 1,011,259 Special mention — 271 — — 6,150 2,635 — 1,293 10,349 Potential problem — 292 14,735 2,791 6,416 8,537 3,086 2,841 38,699 Nonaccrual — — 1,394 — — — — — 1,394 Commercial real estate - owner occupied $ — $ 15,957 $ 220,168 $ 190,794 $ 251,783 $ 147,708 $ 138,816 $ 96,473 $ 1,061,700 Commercial and business lending: Risk rating: Pass $ 1,380 $ 1,709,023 $ 1,940,657 $ 3,065,177 $ 2,063,580 $ 534,581 $ 519,426 $ 541,345 $ 10,373,788 Special mention — 22,050 4,017 46,610 14,675 6,164 — 26,634 120,150 Potential problem 804 81,836 25,250 42,539 53,695 26,269 3,180 3,132 235,900 Nonaccrual 6,414 — 14,710 14,188 33,891 627 — — 63,416 Commercial and business lending $ 8,598 $ 1,812,909 $ 1,984,635 $ 3,168,514 $ 2,165,840 $ 567,642 $ 522,606 $ 571,111 $ 10,793,255 Commercial real estate - investor: Risk rating: Pass $ — $ 155,109 $ 1,263,866 $ 1,266,866 $ 1,080,425 $ 471,371 $ 358,996 $ 239,230 $ 4,835,865 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Potential problem — — 106,002 50,152 15,000 983 — 24,025 196,163 Commercial real estate - investor $ — $ 155,611 $ 1,374,116 $ 1,342,492 $ 1,121,633 $ 472,355 $ 388,768 $ 269,269 $ 5,124,245 Real estate construction: Risk rating: Pass $ — $ 23,307 $ 422,277 $ 1,176,608 $ 547,825 $ 87,680 $ 5,740 $ 7,954 $ 2,271,392 Nonaccrual — — — — — — — 6 6 Real estate construction $ — $ 23,307 $ 422,277 $ 1,176,608 $ 547,825 $ 87,680 $ 5,740 $ 7,960 $ 2,271,398 Commercial real estate lending: Risk rating: Pass $ — $ 178,416 $ 1,686,143 $ 2,443,474 $ 1,628,250 $ 559,052 $ 364,737 $ 247,184 $ 7,107,256 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Potential problem — — 106,002 50,152 15,000 983 — 24,025 196,163 Nonaccrual — — — — — — — 6 6 Commercial real estate lending $ — $ 178,918 $ 1,796,393 $ 2,519,100 $ 1,669,458 $ 560,035 $ 394,508 $ 277,230 $ 7,395,644 Total commercial: Risk rating: Pass $ 1,380 $ 1,887,439 $ 3,626,800 $ 5,508,651 $ 3,691,830 $ 1,093,633 $ 884,162 $ 788,529 $ 17,481,044 Special mention — 22,552 8,265 72,084 40,882 6,164 29,772 32,648 212,368 Potential problem 804 81,836 131,253 92,691 68,695 27,253 3,180 27,157 432,063 Nonaccrual 6,414 — 14,710 14,188 33,891 627 — 6 63,422 Total commercial $ 8,598 $ 1,991,827 $ 3,781,028 $ 5,687,614 $ 3,835,298 $ 1,127,677 $ 917,114 $ 848,341 $ 18,188,898 Residential mortgage: Risk rating: Pass $ — $ — $ 352,321 $ 1,617,409 $ 2,110,577 $ 1,414,186 $ 647,778 $ 1,650,542 $ 7,792,813 Special mention — — — — — — 95 57 152 Potential problem — — 490 93 — — 174 26 784 Nonaccrual — — 1,425 9,567 9,259 10,397 6,628 33,865 71,142 Residential mortgage $ — $ — $ 354,236 $ 1,627,070 $ 2,119,836 $ 1,424,583 $ 654,675 $ 1,684,490 $ 7,864,891 Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2023 2022 2021 2020 2019 Prior Total Auto finance: Risk rating: Pass $ — $ — $ 1,218,820 $ 952,912 $ 75,209 $ 163 $ 456 $ 132 $ 2,247,691 Special mention — — 619 1,850 205 — — — 2,674 Nonaccrual — — 1,032 4,332 430 — 3 — 5,797 Auto finance $ — $ — $ 1,220,471 $ 959,094 $ 75,844 $ 163 $ 458 $ 132 $ 2,256,162 Home equity: Risk rating: Pass $ 8,703 $ 521,000 $ 1,678 $ 29,863 $ 6,084 $ 2,327 $ 4,891 $ 53,350 $ 619,192 Special mention 179 200 — 87 — 29 15 378 708 Potential problem 10 75 10 — — — 33 — 118 Nonaccrual 1,302 160 29 495 132 144 368 7,180 8,508 Home equity $ 10,195 $ 521,434 $ 1,717 $ 30,445 $ 6,217 $ 2,500 $ 5,308 $ 60,907 $ 628,526 Other consumer: Risk rating: Pass $ 121 $ 198,214 $ 6,419 $ 3,732 $ 2,658 $ 1,127 $ 460 $ 64,121 $ 276,731 Special mention 26 843 9 — 3 20 — 6 881 Nonaccrual 27 71 10 1 6 2 8 29 128 Other consumer $ 174 $ 199,129 $ 6,438 $ 3,733 $ 2,668 $ 1,149 $ 468 $ 64,156 $ 277,740 Total consumer: Risk rating: Pass $ 8,824 $ 719,213 $ 1,579,238 $ 2,603,916 $ 2,194,529 $ 1,417,802 $ 653,584 $ 1,768,145 $ 10,936,428 Special mention 205 1,043 628 1,936 208 49 110 441 4,416 Potential problem 10 75 500 93 — — 207 26 901 Nonaccrual 1,330 231 2,496 14,396 9,827 10,544 7,007 41,073 85,574 Total consumer $ 10,369 $ 720,563 $ 1,582,862 $ 2,620,341 $ 2,204,564 $ 1,428,395 $ 660,909 $ 1,809,685 $ 11,027,319 Total loans: Risk rating: Pass $ 10,204 $ 2,606,652 $ 5,206,038 $ 8,112,567 $ 5,886,359 $ 2,511,435 $ 1,537,747 $ 2,556,674 $ 28,417,472 Special mention 205 23,595 8,893 74,020 41,091 6,213 29,882 33,089 216,784 Potential problem 814 81,910 131,753 92,784 68,695 27,253 3,387 27,183 432,965 Nonaccrual 7,744 231 17,206 28,584 43,718 11,170 7,007 41,080 148,997 Total loans $ 18,966 $ 2,712,389 $ 5,363,890 $ 8,307,956 $ 6,039,862 $ 2,556,071 $ 1,578,023 $ 2,658,026 $ 29,216,218 (a) Revolving loans converted to term loans are those converted during the reporting period and are also reported in their year of origination. The following table presents loans by credit quality indicator by origination year at December 31, 2022: Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2022 2021 2020 2019 2018 Prior Total Commercial and industrial: Risk rating: Pass $ 1,423 $ 1,938,777 $ 3,245,546 $ 2,367,008 $ 567,833 $ 573,120 $ 330,642 $ 432,906 $ 9,455,833 Special mention — 93,209 3,411 23,607 — — 19 32,497 152,744 Potential problem 447 24,549 41,400 4,193 21,887 38,169 218 6,133 136,549 Nonaccrual 3,926 — 5,210 — 9,119 — — — 14,329 Commercial and industrial $ 5,796 $ 2,056,535 $ 3,295,567 $ 2,394,809 $ 598,839 $ 611,289 $ 330,879 $ 471,535 $ 9,759,454 Commercial real estate - owner occupied: Risk rating: Pass $ — $ 12,447 $ 211,645 $ 225,627 $ 163,965 $ 160,370 $ 73,487 $ 97,420 $ 944,961 Special mention — — — — 1,136 1,491 9,713 — 12,339 Potential problem — 1,325 1,238 11,141 5,523 10,769 370 4,055 34,422 Commercial real estate - owner occupied $ — $ 13,772 $ 212,883 $ 236,769 $ 170,624 $ 172,630 $ 83,570 $ 101,475 $ 991,722 Commercial and business lending: Risk rating: Pass $ 1,423 $ 1,951,224 $ 3,457,191 $ 2,592,636 $ 731,798 $ 733,490 $ 404,129 $ 530,326 $ 10,400,794 Special mention — 93,209 3,411 23,607 1,136 1,491 9,732 32,497 165,083 Potential problem 447 25,874 42,638 15,335 27,410 48,938 589 10,188 170,971 Nonaccrual 3,926 — 5,210 — 9,119 — — — 14,329 Commercial and business lending $ 5,796 $ 2,070,307 $ 3,508,450 $ 2,631,578 $ 769,463 $ 783,919 $ 414,449 $ 573,010 $ 10,751,176 Commercial real estate - investor: Risk rating: Pass $ 38,412 $ 106,280 $ 1,633,094 $ 1,419,000 $ 683,121 $ 530,444 $ 262,858 $ 210,299 $ 4,845,096 Special mention — — 61,968 24,149 7,361 9,400 — 10,455 113,333 Potential problem — — 16,147 21,303 27,635 1,333 19,017 7,099 92,535 Nonaccrual — — 2,177 25,668 — — — 1,535 29,380 Commercial real estate - investor $ 38,412 $ 106,280 $ 1,713,387 $ 1,490,120 $ 718,117 $ 541,177 $ 281,875 $ 229,387 $ 5,080,344 Real estate construction: Risk rating: Pass $ — $ 29,892 $ 900,593 $ 913,107 $ 241,230 $ 12,062 $ 2,226 $ 9,775 $ 2,108,885 Special mention — — — — 12,174 33,087 — — 45,261 Potential problem — — — — 970 — — — 970 Nonaccrual — — — — — — — 105 105 Real estate construction $ — $ 29,892 $ 900,593 $ 913,107 $ 254,374 $ 45,149 $ 2,226 $ 9,880 $ 2,155,222 Commercial real estate lending: Risk rating: Pass $ 38,412 $ 136,173 $ 2,533,687 $ 2,332,107 $ 924,351 $ 542,505 $ 265,083 $ 220,073 $ 6,953,981 Special mention — — 61,968 24,149 19,535 42,487 — 10,455 158,595 Potential problem — — 16,147 21,303 28,605 1,333 19,017 7,099 93,505 Nonaccrual — — 2,177 25,668 — — — 1,640 29,485 Commercial real estate lending $ 38,412 $ 136,173 $ 2,613,980 $ 2,403,227 $ 972,492 $ 586,326 $ 284,101 $ 239,267 $ 7,235,565 Total commercial: Risk rating: Pass $ 39,835 $ 2,087,396 $ 5,990,879 $ 4,924,743 $ 1,656,149 $ 1,275,996 $ 669,213 $ 750,399 $ 17,354,774 Special mention — 93,209 65,379 47,756 20,671 43,978 9,732 42,952 323,677 Potential problem 447 25,874 58,785 36,638 56,016 50,271 19,606 17,287 264,476 Nonaccrual 3,926 — 7,387 25,668 9,119 — — 1,640 43,814 Total commercial $ 44,208 $ 2,206,480 $ 6,122,430 $ 5,034,805 $ 1,741,955 $ 1,370,245 $ 698,550 $ 812,278 $ 17,986,742 Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2022 2021 2020 2019 2018 Prior Total Residential mortgage: Risk rating: Pass $ — $ — $ 1,410,566 $ 2,184,125 $ 1,716,663 $ 817,164 $ 370,724 $ 1,951,406 $ 8,450,648 Special mention — — — 284 96 — — 63 444 Potential problem — — 455 71 — 738 29 685 1,978 Nonaccrual — — 8,506 3,851 6,219 3,744 5,014 31,145 58,480 Residential mortgage $ — $ — $ 1,419,527 $ 2,188,332 $ 1,722,979 $ 821,645 $ 375,768 $ 1,983,299 $ 8,511,550 Auto finance: Risk rating: Pass $ — $ — $ 1,271,205 $ 106,102 $ 333 $ 1,267 $ 446 $ 61 $ 1,379,414 Special mention — — 1,052 118 — — — — 1,170 Nonaccrual — — 1,149 331 — 9 — — 1,490 Auto finance $ — $ — $ 1,273,406 $ 106,551 $ 333 $ 1,276 $ 446 $ 61 $ 1,382,073 Home equity: Risk rating: Pass $ 7,254 $ 508,212 $ 31,389 $ 6,508 $ 2,112 $ 6,197 $ 6,966 $ 54,827 $ 616,211 Special mention 47 102 — — — — 47 310 458 Potential problem — 15 — — — 34 2 146 197 Nonaccrual 1,590 — 306 102 131 307 319 6,322 7,487 Home equity $ 8,891 $ 508,329 $ 31,695 $ 6,610 $ 2,243 $ 6,538 $ 7,333 $ 61,605 $ 624,353 Other consumer: Risk rating: Pass $ 64 $ 199,942 $ 7,429 $ 5,256 $ 2,468 $ 1,238 $ 174 $ 77,611 $ 294,117 Special mention 6 490 11 — 5 5 — 25 537 Nonaccrual 78 56 11 21 10 56 10 34 197 Other consumer $ 147 $ 200,488 $ 7,452 $ 5,276 $ 2,482 $ 1,300 $ 184 $ 77,670 $ 294,851 Total consumer: Risk rating: Pass $ 7,318 $ 708,154 $ 2,720,589 $ 2,301,991 $ 1,721,576 $ 825,866 $ 378,310 $ 2,083,904 $ 10,740,390 Special mention 52 592 1,063 403 101 5 47 398 2,609 Potential problem — 15 455 71 — 772 31 831 2,175 Nonaccrual 1,668 56 9,973 4,304 6,360 4,116 5,343 37,501 67,654 Total consumer $ 9,038 $ 708,817 $ 2,732,080 $ 2,306,769 $ 1,728,037 $ 830,759 $ 383,731 $ 2,122,635 $ 10,812,828 Total loans: Risk rating: Pass $ 47,152 $ 2,795,551 $ 8,711,468 $ 7,226,734 $ 3,377,725 $ 2,101,861 $ 1,047,522 $ 2,834,303 $ 28,095,164 Special mention 52 93,801 66,443 48,159 20,772 43,983 9,778 43,350 326,286 Potential problem 447 25,889 59,240 36,709 56,016 51,043 19,637 18,118 266,651 Nonaccrual 5,595 56 17,360 29,972 15,479 4,116 5,343 39,141 111,467 Total loans $ 53,246 $ 2,915,297 $ 8,854,510 $ 7,341,574 $ 3,469,992 $ 2,201,004 $ 1,082,280 $ 2,934,912 $ 28,799,569 (a) Revolving loans converted to term loans are those reported during the reporting period and are also reported in their year of origination. The following table presents gross charge offs by origination year at December 31, 2023: Gross Charge Offs by Origination Year ($ in thousands) Rev Loans Amortized Cost Basis 2023 2022 2021 2020 2019 Prior Total Commercial and industrial $ 4,130 $ 717 $ 9,594 $ 25,270 $ 5,958 $ — $ 18 $ 45,687 Commercial real estate-owner occupied — — — — — 25 — 25 Commercial and business lending 4,130 717 9,594 25,270 5,958 25 18 45,713 Commercial real estate-investor — — — — — — 252 252 Real estate construction — — — — — — 25 25 Commercial real estate lending — — — — — — 277 277 Total commercial 4,130 717 9,594 25,270 5,958 25 295 45,989 Residential mortgage — 2 32 42 148 5 723 952 Auto finance — 795 4,524 626 — 5 — 5,950 Home equity 53 21 3 31 — 22 294 424 Other consumer 4,884 — 72 124 131 72 170 5,453 Total consumer 4,937 818 4,630 823 279 105 1,187 12,779 Total gross charge offs $ 9,068 $ 1,535 $ 14,224 $ 26,093 $ 6,237 $ 130 $ 1,482 $ 58,768
Loans, Past Due Status	The following table presents loans by past due status at December 31, 2023: Accruing ($ in thousands) Current 30-59 Days 60-89 Days 90+ Days Nonaccrual (a)(b) Total Commercial and industrial $ 9,663,587 $ 5,374 $ 191 $ 380 $ 62,022 $ 9,731,555 Commercial real estate - owner occupied 1,059,948 — 358 — 1,394 1,061,700 Commercial and business lending 10,723,536 5,374 549 380 63,416 10,793,255 Commercial real estate - investor 5,086,117 — 18,697 19,432 — 5,124,245 Real estate construction 2,271,392 — — — 6 2,271,398 Commercial real estate lending 7,357,509 — 18,697 19,432 6 7,395,644 Total commercial 18,081,044 5,374 19,246 19,812 63,422 18,188,898 Residential mortgage 7,780,304 13,294 152 — 71,142 7,864,891 Auto finance 2,232,906 14,712 2,674 73 5,797 2,256,162 Home equity 615,810 3,500 708 — 8,508 628,526 Other consumer 273,644 1,233 932 1,803 128 277,740 Total consumer 10,902,664 32,739 4,467 1,876 85,574 11,027,319 Total loans $ 28,983,708 $ 38,113 $ 23,712 $ 21,689 $ 148,997 $ 29,216,218 (a) Of the total nonaccrual loans, $80 million, or 53%, were current with respect to payment at December 31, 2023. (b) No interest income was recognized on nonaccrual loans for the year ended December 31, 2023. In addition, there were $23 million of nonaccrual loans for which there was no related ACLL at December 31, 2023. The following table presents loans by past due status at December 31, 2022: Accruing ($ in thousands) Current 30-59 Days 60-89 Days 90+ Days Nonaccrual (a)(b) Total Commercial and industrial $ 9,738,561 $ 716 $ 5,566 $ 282 $ 14,329 $ 9,759,454 Commercial real estate - owner occupied 991,493 218 12 — — 991,722 Commercial and business lending 10,730,053 934 5,578 282 14,329 10,751,176 Commercial real estate - investor 5,049,897 1,067 — — 29,380 5,080,344 Real estate construction 2,155,077 39 — — 105 2,155,222 Commercial real estate lending 7,204,975 1,105 — — 29,485 7,235,565 Total commercial 17,935,028 2,040 5,578 282 43,814 17,986,742 Residential mortgage 8,443,072 9,811 63 124 58,480 8,511,550 Auto finance 1,371,176 8,238 1,170 — 1,490 1,382,073 Home equity 611,259 5,149 458 — 7,487 624,353 Other consumer 291,722 1,018 592 1,322 197 294,851 Total consumer 10,717,229 24,216 2,283 1,446 67,654 10,812,828 Total loans $ 28,652,257 $ 26,256 $ 7,861 $ 1,728 $ 111,467 $ 28,799,569 (a) Of the total nonaccrual loans, $64 million, or 58%, were current with respect to payment at December 31, 2022. (b) No interest income was recognized on nonaccrual loans for the year ended December 31, 2022. In addition, there were $11 million of nonaccrual loans for which there was no related ACLL at December 31, 2022.
Loans, Modifications	The following tables show the composition of loan modifications made to borrowers experiencing financial difficulty by the loan portfolio and type of concessions granted during the twelve months ended December 31, 2023. Each of the types of concessions granted comprised less than 1% of their respective classes of loan portfolios at December 31, 2023. Interest Rate Concession ($ in thousands) Amortized Cost Commercial and industrial $ 306 Auto 255 Home equity 77 Other consumer 1,449 Total loans modified $ 2,087 Term Extension ($ in thousands) Amortized Cost Residential mortgage $ 208 Home equity 25 Total loans modified $ 233 Combination - Interest Rate Concession and Term Extension ($ in thousands) Amortized Cost Residential mortgage $ 865 Home equity 339 Total loans modified $ 1,204 The following tables summarize, by loan portfolio, the financial effect of the Corporation's loan modifications on the modified loans as of December 31, 2023: Interest Rate Concession Loan Type Financial Effect, Weighted Average Contractual Interest Rate (Decrease) Increase (a) Commercial and industrial (19) % Residential mortgage 1 % Auto (9) % Home equity — % Other consumer (21) % Weighted average of total loans modified (11) % (a) Due to market conditions, some interest rate concessions on floating rate loans may involve an increase in rate that was lower in comparison to the rate of increase for floating rate loans not modified. Term Extension Loan Type Financial Effect, Weighted Average Term Increase (a) Residential mortgage 65 months Home equity 85 months Weighted average of total loans modified 71 months (a) During the twelve months ended December 31, 2023, term extensions changed the weighted average term on modified loans from 175 to 245 months.
Loans, Modifications in Last 12 Months, Performance	The following table depicts the performance of loans that have been modified in the twelve months ended December 31, 2023: Payment Status (Amortized Cost Basis) ($ in thousands) Current 30-89 Days Past Due 90+ Days Past Due Nonaccrual Commercial and industrial $ 306 $ — $ — $ — Residential mortgage 405 — — 668 Auto 218 36 — — Home equity 258 47 — 137 Other consumer 1,449 — — — Total loans modified $ 2,636 $ 83 $ — $ 805
Loans, Modified, Subsequent Default	The following table provides the amortized cost of loan modifications by loan portfolio and type of concession that were modified in the previous twelve months and subsequently had a payment default, as of December 31, 2023: Amortized Cost of Loan Modifications that Subsequently Defaulted ($ in thousands) Interest Rate Concession Term Extension Combination Interest Rate Reduction and Term Extension Residential mortgage $ — $ 208 $ 248 Home equity — — 27 Total loans modified $ — $ 208 $ 275
Loans, TDR Performance and Nonaccrual	The following table presents nonaccrual and performing restructured loans by loan portfolio at December 31, 2022, prior to the adoption of ASU 2022-02: December 31, 2022 ($ in thousands) Performing Restructured Loans Nonaccrual Restructured Loans (a) Commercial and industrial $ 12,453 $ — Commercial real estate - owner occupied 316 — Commercial real estate - investor 128 2,074 Real estate construction 195 9 Residential mortgage 16,829 17,117 Home equity 2,148 927 Other consumer 798 — Total restructured loans $ 32,868 $ 20,127 (a) Nonaccrual restructured loans have been included within nonaccrual loans.
Loans, TDR, Summary	The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance at December 31, 2022: December 31, 2022 ($ in thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 2 $ 281 $ 281 Residential mortgage 55 10,557 10,777 Home equity 15 531 557 Total loans modified 72 $ 11,370 $ 11,616 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-modification outstanding recorded investment.
Loans, TDR, Subsequent Default	The following table provides the number of loans modified during the previous twelve months which subsequently defaulted during the year ended December 31, 2022, and the recorded investment in these restructured loans at the time of default as of December 31, 2022: December 31, 2022 ($ in thousands) Number of Recorded Residential mortgage 4 $ 1,178
Changes in the allowance for credit losses by portfolio segment	The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2023: ($ in thousands) Dec 31, 2022 Charge Offs Recoveries Net Charge Offs Provision for Credit Losses Dec 31, 2023 ACLL / Loans Allowance for loan losses Commercial and industrial $ 119,076 $ (45,687) $ 3,015 $ (42,672) $ 51,859 $ 128,263 Commercial real estate — owner occupied 9,475 (25) 11 (15) 1,150 10,610 Commercial and business lending 128,551 (45,713) 3,026 (42,687) 53,009 138,873 Commercial real estate — investor 54,398 (252) 3,016 2,763 10,697 67,858 Real estate construction 45,589 (25) 80 55 7,910 53,554 Commercial real estate lending 99,986 (277) 3,095 2,819 18,607 121,412 Total commercial 228,538 (45,989) 6,121 (39,868) 71,616 260,285 Residential mortgage 38,298 (952) 541 (411) (79) 37,808 Auto finance 19,619 (5,950) 1,241 (4,709) 10,051 24,961 Home equity 14,875 (424) 1,262 837 (310) 15,403 Other consumer 11,390 (5,453) 978 (4,475) 5,723 12,638 Total consumer 84,182 (12,779) 4,021 (8,758) 15,384 90,809 Total loans $ 312,720 $ (58,768) $ 10,142 $ (48,626) $ 87,000 $ 351,094 Allowance for unfunded commitments Commercial and industrial $ 12,997 $ — $ — $ — $ 321 $ 13,319 Commercial real estate — owner occupied 103 — — — 46 149 Commercial and business lending 13,101 — — — 367 13,468 Commercial real estate — investor 710 — — — (230) 480 Real estate construction 20,583 — — — (3,558) 17,024 Commercial real estate lending 21,292 — — — (3,788) 17,504 Total commercial 34,393 — — — (3,421) 30,972 Home equity 2,699 — — — (70) 2,629 Other consumer 1,683 — — — (509) 1,174 Total consumer 4,382 — — — (579) 3,803 Total loans $ 38,776 $ — $ — $ — $ (4,000) $ 34,776 Allowance for credit losses on loans Commercial and industrial $ 132,073 $ (45,687) $ 3,015 $ (42,672) $ 52,181 $ 141,582 1.45 % Commercial real estate — owner occupied 9,579 (25) 11 (15) 1,195 10,759 1.01 % Commercial and business lending 141,652 (45,713) 3,026 (42,687) 53,376 152,341 1.41 % Commercial real estate — investor 55,108 (252) 3,016 2,763 10,467 68,338 1.33 % Real estate construction 66,171 (25) 80 55 4,351 70,578 3.11 % Commercial real estate lending 121,279 (277) 3,095 2,819 14,819 138,916 1.88 % Total commercial 262,931 (45,989) 6,121 (39,868) 68,195 291,257 1.60 % Residential mortgage 38,298 (952) 541 (411) (79) 37,808 0.48 % Auto finance 19,619 (5,950) 1,241 (4,709) 10,051 24,961 1.11 % Home equity 17,574 (424) 1,262 837 (380) 18,032 2.87 % Other consumer 13,073 (5,453) 978 (4,475) 5,214 13,812 4.97 % Total consumer 88,565 (12,779) 4,021 (8,758) 14,805 94,613 0.86 % Total loans $ 351,496 $ (58,768) $ 10,142 $ (48,626) $ 83,000 $ 385,870 1.32 % The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2022: ($ in thousands) Dec 31, 2021 Charge Offs Recoveries Net Charge Offs Provision for Credit Losses Dec 31, 2022 ACLL / Loans Allowance for loan losses Commercial and industrial $ 89,857 $ (4,491) $ 5,282 $ 791 $ 28,428 $ 119,076 Commercial real estate — owner occupied 11,473 — 13 13 (2,011) 9,475 Commercial and business lending 101,330 (4,491) 5,295 804 26,418 128,551 Commercial real estate — investor 72,803 (50) 50 — (18,405) 54,398 Real estate construction 37,643 (48) 106 58 7,887 45,589 Commercial real estate lending 110,446 (98) 156 58 (10,518) 99,986 Total commercial 211,776 (4,588) 5,451 862 15,900 228,538 Residential mortgage 40,787 (567) 908 341 (2,830) 38,298 Auto finance 1,999 (1,041) 98 (943) 18,563 19,619 Home equity 14,011 (587) 1,385 798 66 14,875 Other consumer 11,441 (3,363) 1,010 (2,353) 2,301 11,390 Total consumer 68,239 (5,558) 3,401 (2,157) 18,100 84,182 Total loans $ 280,015 $ (10,146) $ 8,852 $ (1,294) $ 34,000 $ 312,720 Allowance for unfunded commitments Commercial and industrial $ 18,459 $ — $ — $ — $ (5,462) $ 12,997 Commercial real estate — owner occupied 208 — — — (105) 103 Commercial and business lending 18,667 — — — (5,566) 13,101 Commercial real estate — investor 936 — — — (226) 710 Real estate construction 15,586 — — — 4,997 20,583 Commercial real estate lending 16,522 — — — 4,770 21,292 Total commercial 35,189 — — — (796) 34,393 Home equity 2,592 — — — 107 2,699 Other consumer 1,995 — — — (311) 1,683 Total consumer 4,587 — — — (204) 4,382 Total loans $ 39,776 $ — $ — $ — $ (1,000) $ 38,776 Allowance for credit losses on loans Commercial and industrial $ 108,316 $ (4,491) $ 5,282 $ 791 $ 22,967 $ 132,073 1.35 % Commercial real estate — owner occupied 11,681 — 13 13 (2,115) 9,579 0.97 % Commercial and business lending 119,997 (4,491) 5,295 804 20,852 141,652 1.32 % Commercial real estate — investor 73,739 (50) 50 — (18,631) 55,108 1.08 % Real estate construction 53,229 (48) 106 58 12,884 66,171 3.07 % Commercial real estate lending 126,968 (98) 156 58 (5,748) 121,279 1.68 % Total commercial 246,965 (4,588) 5,451 862 15,104 262,931 1.46 % Residential mortgage 40,787 (567) 908 341 (2,830) 38,298 0.45 % Auto finance 1,999 (1,041) 98 (943) 18,563 19,619 1.42 % Home equity 16,603 (587) 1,385 798 173 17,574 2.81 % Other consumer 13,436 (3,363) 1,010 (2,353) 1,990 13,073 4.43 % Total consumer 72,825 (5,558) 3,401 (2,157) 17,896 88,565 0.82 % Total loans $ 319,791 $ (10,146) $ 8,852 $ (1,294) $ 33,000 $ 351,496 1.22 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	The Corporation has CDIs and historically had other intangible assets, both of which are amortized. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in thousands) 2023 2022 2021 Core deposit intangibles Gross carrying amount at the beginning of the year $ 88,109 $ 88,109 $ 88,109 Accumulated amortization (47,638) (38,827) (30,016) Net book value $ 40,471 $ 49,282 $ 58,093 Amortization during the year $ 8,811 $ 8,811 $ 8,811 Other intangibles Gross carrying amount at the beginning of the year $ — $ — $ 2,000 Reductions due to sale — — (1,317) Accumulated amortization — — (683) Net book value $ — $ — $ — Amortization during the year $ — $ — $ 33
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 MSRs asset under the fair value measurement method for the years ended December 31, 2023 and 2022 is as follows: ($ in thousands) 2023 2022 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 77,351 $ 54,862 Cumulative effect of accounting methodology change N/A 2,296 Balance at beginning of period, adjusted $ 77,351 $ 57,158 Additions 3,564 7,279 Paydowns (7,185) (9,350) Valuation: Change in fair value model assumptions 8,881 5,715 Changes in fair value of asset 1,778 16,549 Mortgage servicing rights at end of period $ 84,390 $ 77,351 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) (a) $ 7,364,492 $ 6,711,820 Mortgage servicing rights to servicing portfolio (a) 1.15 % 1.15 % (a) During the fourth quarter of 2023, the Corporation transferred $969 million of residential mortgages into held for sale and subsequently sold them for $844 million. After sale, the servicing has been retained for a short period until full servicing can be transferred to the purchaser. Prior to January 1, 2022, the Corporation accounted for its MSRs under the amortization methodology. See Note 1 for the Corporation’s accounting policy for MSRs when they were still under the amortization methodology. A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance under the amortization methodology for the year ended December 31, 2021 is as follows: ($ in thousands) 2021 Mortgage servicing rights Mortgage servicing rights at beginning of year $ 59,967 Additions 16,151 Amortization (19,436) Mortgage servicing rights at end of year $ 56,682 Valuation allowance at beginning of year (18,006) (Additions) recoveries, net 16,186 Valuation allowance at end of year (1,820) Mortgage servicing rights, net $ 54,862 Fair value of mortgage servicing rights $ 57,259 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) 6,994,834 Mortgage servicing rights, net to servicing portfolio 0.78 % Mortgage servicing rights expense (a) $ 3,250 (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 on the consolidated statements of income.
Summary of estimated future amortization expense	The projections of amortization expense for CDIs and decay for MSRs are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2023. The actual 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 CDIs and decay for MSRs: ($ in thousands) Core Deposit Intangibles Mortgage Servicing Rights Year ending December 31, 2024 $ 8,811 $ 10,555 2025 8,811 11,404 2026 8,811 10,710 2027 8,811 9,922 2028 3,485 9,005 Beyond 2028 1,742 32,794 Total estimated amortization expense and MSRs decay (a) $ 40,471 $ 84,390

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	A summary of premises and equipment at December 31, 2023 and 2022 is as follows: 2023 2022 ($ in thousands) Estimated Cost Accumulated Net Book Net Book Land — $ 63,984 $ — $ 63,984 $ 65,516 Land improvements 3 – 20 years 21,659 10,409 11,250 10,074 Buildings and improvements 5 – 40 years 399,575 187,572 212,004 213,496 Computers and related equipment 4 – 8 years 57,265 46,420 10,845 12,606 Furniture, fixtures and other equipment 3 – 20 years 124,108 88,481 35,627 33,110 Operating leases — 43,782 19,070 24,712 25,617 Leasehold improvements 2 – 20 years 39,607 25,051 14,556 16,487 Total premises and equipment $ 749,981 $ 377,003 $ 372,978 $ 376,906

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Lease, Cost [Table Text Block]	Operating and finance lease costs and cash flows resulting from these leases are presented below: Twelve Months Ended December 31, ($ in thousands) 2023 2022 2021 Operating lease costs $ 6,281 $ 6,812 $ 8,712 Finance lease costs 92 119 107 Operating lease cash flows 7,171 8,440 11,183 Finance lease cash flows 92 125 137
Assets And Liabilities, Lessee [Table Text Block]	The lease classifications on the consolidated balance sheets were as follows: Consolidated Balance Sheets Category ($ in thousands) December 31, 2023 December 31, 2022 Operating lease right-of-use asset Premises and equipment $ 24,712 $ 25,617 Finance lease right-of-use asset Other assets 368 455 Operating lease liability Accrued expenses and other liabilities 27,311 28,357 Finance lease liability Other long-term funding 383 469
Lessee, Operating Lease, Information [Table Text Block]	The lease payment obligations, weighted-average remaining lease term, and weighted-average original discount rate were as follows: December 31, 2023 December 31, 2022 ($ in thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Retail and corporate offices $ 25,729 5.76 3.12 % $ 26,140 5.92 2.62 % Land 4,050 6.98 3.48 % 4,766 7.59 3.14 % Equipment 408 2.50 4.62 % — 0.00 — % Total operating leases $ 30,187 5.88 3.19 % $ 30,906 6.17 2.70 % Finance leases Retail and corporate offices $ 394 4.25 1.32 % $ 485 5.25 1.32 % Total finance leases $ 394 4.25 1.32 % $ 485 5.25 1.32 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Contractual 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) Operating Leases Finance Leases Total Leases Twelve months ending December 31, 2024 $ 6,459 $ 93 $ 6,552 2025 5,628 93 5,721 2026 5,043 93 5,135 2027 4,373 93 4,465 2028 3,428 23 3,451 Beyond 2028 5,257 — 5,257 Total lease payments $ 30,187 $ 394 $ 30,581 Less: interest 2,877 11 2,887 Present value of lease payments $ 27,311 $ 383 $ 27,694
Lessee, Operating Lease, Disclosure [Table Text Block]	The approximate minimum annual rental payments and rental receipts under non-cancelable agreements and leases are as follows: ($ in thousands) Payments Receipts 2024 $ 6,352 $ 3,522 2025 5,436 3,854 2026 5,117 3,539 2027 4,447 3,146 2028 3,448 2,338 Beyond 2028 5,447 12,446 Total $ 30,247 $ 28,843

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
Deposits [Abstract]
Deposit Liabilities, Type	The distribution of deposits at December 31, 2023 and 2022 are as follows: ($ in thousands) 2023 2022 Noninterest-bearing demand $ 6,119,956 $ 7,760,811 Savings 4,835,701 4,604,848 Interest-bearing demand 8,843,967 7,100,727 Money market 6,330,453 8,239,610 Brokered CDs 4,447,479 541,916 Other time deposits 2,868,494 1,388,242 Total deposits $ 33,446,049 $ 29,636,154
Time deposits by maturity	Aggregate annual maturities of all time deposits at December 31, 2023, are as follows: Maturities During Year Ending December 31, ($ in thousands) 2024 $ 7,100,729 2025 175,549 2026 20,680 2027 11,694 2028 7,315 Thereafter 5 Total $ 7,315,973

Short and Long-term Funding (Ta

Short and Long-term Funding (Tables)	12 Months Ended
	Dec. 31, 2023
Short-Term Debt [Abstract]
Short and Long-Term Funding Composition	The following table presents the components of short-term funding (funding with original contractual maturities of one year or less), and long-term funding (funding with original contractual maturities greater than one year): ($ in thousands) December 31, 2023 December 31, 2022 Short-term funding Federal funds purchased $ 220,160 $ 344,170 Securities sold under agreements to repurchase 106,620 240,969 Federal funds purchased and securities sold under agreements to repurchase 326,780 585,139 Commercial paper — 20,798 Total short-term funding $ 326,780 $ 605,937 Long-term funding Corporation subordinated notes, at par $ 550,000 $ 250,000 Discount and capitalized costs (7,748) (544) Subordinated debt fair value hedge (a) (1,366) (1,855) Finance leases 383 469 Total long-term funding $ 541,269 $ 248,071 Total short and long-term funding, excluding FHLB advances $ 868,049 $ 854,007 FHLB advances Short-term FHLB advances $ 740,000 $ 3,125,000 Long-term FHLB advances 1,209,907 1,209,170 FHLB advances fair value hedge (a) (9,713) (14,308) Total FHLB advances $ 1,940,194 $ 4,319,861 Total short and long-term funding $ 2,808,243 $ 5,173,869 (a) For additional information on the fair value hedges, see Note 14.
Schedule of Repurchase Agreements	The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of December 31, 2023 and 2022 are presented in the following table: Overnight and Continuous ($ in thousands) December 31, 2023 December 31, 2022 Repurchase agreements Agency mortgage-related securities $ 106,620 $ 240,969
Schedule of Maturities of Long-term Debt [Table Text Block]	The table below summarizes the expected maturities of the Corporation’s long-term funding at December 31, 2023: ($ in thousands) Long Term Funding Year 2024 $ 248,884 2025 394,797 2026 604,540 2027 671 2028 198,966 Beyond 2028 293,605 Total long-term funding $ 1,741,463

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Company's Stock Option Activities	A summary of the Corporation’s stock option activity for the year ended December 31, 2023 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Aggregate Intrinsic Value (a) Outstanding at December 31, 2022 3,994 $ 21.06 5.11 years $ 10,525 Exercised 178 17.26 Forfeited or expired 24 19.54 Outstanding at December 31, 2023 3,792 $ 21.25 4.26 years $ 5,834 Options exercisable at December 31, 2023 3,583 $ 21.44 4.15 years $ 5,139 (a) In thousands
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)	The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2023: Restricted Stock Shares (a) Weighted Average Outstanding at December 31, 2022 2,303 $ 20.81 Granted 880 22.10 Vested 778 21.02 Forfeited 55 21.90 Outstanding at December 31, 2023 2,349 $ 21.20 (a) In thousands

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Change in Benefit Obligation	The funded status and amounts recognized on the 2023 and 2022 consolidated balance sheets, as measured on December 31, 2023 and 2022, respectively, for the RAP and Postretirement Plan were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2023 2023 2022 2022 Change in fair value of plan assets Fair value of plan assets at beginning of year $ 407,405 $ — $ 497,796 $ — Actual return on plan assets 60,565 — (74,140) — Employer contributions — 171 — 193 Gross benefits paid (14,513) (171) (16,252) (193) Fair value of plan assets at end of year (a) $ 453,457 $ — $ 407,405 $ — Change in benefit obligation Net benefit obligation at beginning of year $ 208,315 $ 1,530 $ 261,321 $ 1,975 Service cost 3,189 — 3,670 — Interest cost 10,887 78 7,152 53 Actuarial (gain) loss 3,475 (12) (47,577) (305) Gross benefits paid (14,513) (171) (16,252) (193) Net benefit obligation at end of year (a) $ 211,353 $ 1,425 $ 208,315 $ 1,530 Funded (unfunded) status $ 242,104 $ (1,425) $ 199,089 $ (1,530) Noncurrent assets $ 242,104 $ — $ 199,089 $ — Current liabilities — (158) — (164) Noncurrent liabilities — (1,267) — (1,366) Asset (liability) recognized on the consolidated balance sheets $ 242,104 $ (1,425) $ 199,089 $ (1,530) (a) The fair value of the plan assets represented 215% and 196% of the net benefit obligation of the pension plan at December 31, 2023 and 2022, respectively.
AOCI Components	Amounts recognized in accumulated other comprehensive (income) loss, net of tax, as of December 31, 2023 and 2022 were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2023 2023 2022 2022 Prior service cost $ (884) $ (308) $ (1,064) $ (362) Net actuarial loss (gain) 27,089 (301) 44,919 (316) Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss $ 26,204 $ (609) $ 43,855 $ (678)
Changes in OCI	Other changes in plan assets and benefit obligations recognized in OCI, net of tax, in 2023 and 2022 were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2023 2023 2022 2022 Net actuarial gain (loss) $ 24,228 $ 12 $ (53,466) $ 305 Amortization of prior service cost (250) (75) (250) (75) Amortization of actuarial loss (gain) — (29) 658 — Income tax benefit (expense) (6,327) 23 13,553 (58) Total recognized in OCI $ 17,650 $ (68) $ (39,504) $ 171
Net period benefit cost for the pension plans	The components of net periodic pension cost for the RAP for 2023, 2022, and 2021 were as follows: ($ in thousands) 2023 2022 2021 Service cost $ 3,189 $ 3,670 $ 7,779 Interest cost 10,887 7,152 6,570 Expected return on plan assets (32,862) (26,903) (25,675) Amortization of prior service cost (250) (250) (73) Amortization of actuarial loss — 658 4,594 Recognized settlement loss — — 434 Total net periodic pension (income) $ (19,037) $ (15,673) $ (6,370)
Net period benefit cost for postretirement plan	The components of net periodic benefit cost for the Postretirement Plan for 2023, 2022, and 2021 were as follows: ($ in thousands) 2023 2022 2021 Interest cost $ 78 $ 53 $ 52 Amortization of prior service cost (75) (75) (75) Amortization of actuarial (gain) (29) — — Total net periodic benefit (income) $ (26) $ (22) $ (24)
Weighted Average Benefit Assumptions	RAP Postretirement RAP Postretirement 2023 2023 2022 2022 Weighted average assumptions used to determine benefit obligations Discount rate 5.40 % 5.40 % 5.40 % 5.40 % Rate of increase in compensation levels 2.50 % N/A 2.50 % N/A Interest crediting rate 3.77 % N/A 3.46 % N/A Weighted average assumptions used to determine net periodic benefit costs Discount rate 5.40 % 5.40 % 2.80 % 2.80 % Rate of increase in compensation levels 2.50 % N/A 2.50 % N/A Expected long-term rate of return on plan assets 7.30 % N/A 6.00 % N/A
Plan Asset Allocation Percentages	The asset allocation for the RAP as of the December 31, 2023 and 2022 measurement dates, respectively, by asset category were as follows: Asset Category 2023 2022 Equity securities 54 % 53 % Fixed-income securities 34 % 35 % Group annuity contracts 10 % 10 % Other 2 % 2 % Total 100 % 100 %
Schedule Of Pension Plan Investments [Table Text Block]	Based on these inputs, the following table summarizes the fair value of the RAP’s investments as of December 31, 2023 and 2022: Fair Value Measurements Using ($ in thousands) December 31, 2023 Level 1 Level 2 Level 3 RAP investments Money market account $ 10,040 $ 10,040 $ — $ — Common /collective trust funds 164,891 164,891 — — Mutual funds 234,840 234,840 — — Group annuity contracts 43,687 — — 43,687 Total RAP investments $ 453,457 $ 409,771 $ — $ 43,687 Fair Value Measurements Using ($ in thousands) December 31, 2022 Level 1 Level 2 Level 3 RAP investments Money market account $ 6,628 $ 6,628 $ — $ — Common /collective trust funds 155,654 155,654 — — Mutual funds 204,184 204,184 — — Group annuity contracts 40,939 — — 40,939 Total RAP investments $ 407,405 $ 366,466 $ — $ 40,939
Schedule of Changes in Fair Value of Plan Assets	The following presents a summary of the changes in the fair value of the RAP's Level 3 asset during the periods indicated. Fair Value Reconciliation of Level 3 RAP Investments 2023 2022 Fair value of group annuity contract at beginning of period $ 40,939 $ 49,213 Return on plan assets 5,313 (5,671) Benefits paid (2,565) (2,604) Fair value of group annuity contract at end of period $ 43,687 $ 40,939
Expected Benefit Payments	The projected benefit payments were calculated using the same assumptions as those used to calculate the benefit obligations listed above. The projected benefit payments for the RAP and Postretirement Plan at December 31, 2023, reflecting expected future services, were as follows: ($ in thousands) RAP Postretirement Plan Estimated future benefit payments 2024 $ 20,198 $ 163 2025 22,320 158 2026 21,163 152 2027 19,804 146 2028 19,842 140 2029-2033 83,328 595

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Current and Deferred Income Tax Expense (Benefit)	The current and deferred amounts of income tax expense (benefit) were as follows: Years Ended December 31, ($ in thousands) 2023 2022 2021 Current Federal $ 29,319 $ 58,982 $ 57,916 State 5,283 22,092 12,035 Total current 34,602 81,074 69,951 Deferred Federal (8,371) 12,531 9,115 State (3,135) (97) 6,247 Total deferred (11,506) 12,434 15,362 Total income tax expense $ 23,097 $ 93,508 $ 85,313
Schedule of Deferred Tax Assets and Liabilities	Temporary differences between the amounts reported on the financial statements and the tax bases of assets and liabilities resulted in deferred taxes. DTAs and liabilities at December 31, 2023 and 2022, included in other assets and accrued expenses and other liabilities on the consolidated balance sheets, respectively, were as follows: ($ in thousands) 2023 2022 Deferred tax assets Allowance for loan losses $ 83,378 $ 79,142 Allowance for other losses 8,933 10,558 Accrued liabilities 14,089 2,842 Deferred compensation 28,429 30,246 Federal tax credits carryforward 8,849 — Benefit of state tax losses and credit carryforwards 9,068 7,476 Nonaccrual interest 901 891 Partnerships 2,365 — Lease liability 6,785 7,390 Net unrealized losses on AFS securities 48,632 80,148 Net unrealized losses on pension and postretirement benefits 8,506 14,803 Other 9,403 4,545 Total deferred tax assets $ 229,338 $ 238,041 Deferred tax liabilities Prepaid expenses $ 66,381 $ 64,480 Goodwill 22,161 23,119 Mortgage banking activities 20,799 20,145 Deferred loan fee income 8,097 4,269 State deferred taxes 1,387 1,389 Lease financing 15,297 3,145 Bank premises and equipment 20,389 20,860 Purchase accounting 7,898 10,381 Basis difference from equity securities and other investments 7,593 5,582 Other 1,207 821 Total deferred tax liabilities $ 171,209 $ 154,191 Net deferred tax assets $ 58,129 $ 83,850
Schedule of Effective Income Tax Rate Reconciliation	The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows: 2023 2022 2021 Federal income tax rate at statutory rate 21.0 % 21.0 % 21.0 % Increases (decreases) resulting from: Tax-exempt interest and dividends (7.4) % (3.4) % (3.0) % State income taxes (net of federal benefit) 0.3 % 4.2 % 3.8 % Bank owned life insurance (1.1) % (0.5) % (0.6) % Tax effect of tax credits and benefits, net of related expenses (4.7) % (1.6) % (1.8) % Net tax (benefit) from stock-based compensation — % (0.2) % — % Restructuring in conjunction with ABRC sale — % — % (0.1) % FDIC premium 3.0 % 0.7 % 0.5 % Other 0.1 % 0.1 % (0.2) % Effective income tax rate 11.2 % 20.3 % 19.6 %
Summary Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was as f ollows: ($ in thousands) 2023 2022 Balance at beginning of year $ 2,233 $ 2,324 Subtractions for tax positions related to prior years (441) (486) Additions for tax positions related to current year 435 395 Balance at end of year $ 2,227 $ 2,233

Derivative and Hedging Activiti

Derivative and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other Derivative Instruments Not Designated As Hedging Instruments [Table Text Block]	December 31, 2023 December 31, 2022 Asset Liability Asset Liability ($ in thousands) Notional Amount Fair Notional Amount Fair Notional Amount Fair Notional Amount Fair Designated as hedging instruments: Interest rate-related instruments $ 2,300,000 $ 8,075 $ 550,000 $ 930 $ 900,000 $ 4,349 $ 1,150,000 $ 1,260 Foreign currency exchange forwards 231,566 632 189,212 2,946 261,595 416 167,088 972 Total designated as hedging instruments 8,707 3,876 4,765 2,233 Not designated as hedging instruments: Interest rate-related and other instruments 3,603,513 111,623 6,528,471 195,662 4,246,823 62,401 4,599,391 251,398 Foreign currency exchange forwards 87,526 2,954 135,654 2,746 68,570 437 34,240 402 Mortgage banking (a) 29,490 439 51,500 673 21,265 86 33,000 46 Total not designated as hedging instruments 115,016 199,082 62,925 251,847 Gross derivatives before netting 123,723 202,958 67,690 254,079 Less: Legally enforceable master netting agreements 18,234 18,234 2,788 2,788 Less: Cash collateral pledged/received 35,855 — 26,898 217 Total derivative instruments, after netting $ 69,634 $ 184,724 $ 38,003 $ 251,073 (a) The notional amount of the mortgage derivative asset includes interest rate lock commitments, while the notional amount of the mortgage derivative liability includes forward commitments.
Balance Sheet Recording of Fair Value Hedge [Table]	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) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Carrying Amount of the Hedged Assets/(Liabilities) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) ($ in thousands) December 31, 2023 December 31, 2022 Other long-term funding $ (548,634) $ 1,366 $ (248,145) $ 1,855 FHLB Advances (590,287) 9,713 (585,692) 14,308 Total $ (1,138,921) $ 11,079 $ (833,837) $ 16,163
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The tables below identify the effect of fair value and cash flow hedge accounting on the Corporation's consolidated statements of income during the twelve months ended December 31, 2023, 2022, and 2021: Location and Amount Recognized on the Consolidated Statements of Income in Fair Value and Cash Flow Hedging Relationships For the Years Ended December 31, 2023 2022 2021 ($ in thousands) Interest Income Interest Expense Loss on Mortgage Portfolio Sale Interest Income Interest Expense Interest Income Total amounts of income/expense presented on the consolidated statements of income in which the effects of the fair value or cash flow hedges are recorded (a) $ (14,176) $ 17,536 $ (125) $ (263) $ 334 $ (1,376) The effects of fair value and cash flow hedging: Impact on fair value hedging relationships in Subtopic 815-20 Interest contracts: Hedged items (245) 5,084 (125) (529) (16,163) (1,376) Derivatives designated as hedging instruments (a) (13,930) 12,451 — 266 16,497 — (a) Includes net settlements on the derivatives.
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table presents the effect of cash flow hedge accounting on accumulated other comprehensive income (loss) for the twelve months ended December 31, 2023, 2022, and 2021: For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Interest rate-related instruments designated as cash flow hedging instruments Amount of gain (loss) recognized in OCI on cash flow hedge derivative (a) $ (13,254) $ 3,626 $ — Amount of (gain) loss reclassified from accumulated other comprehensive income (loss) into interest income (a) 13,930 (266) — (a) The entirety of gains (losses) recognized in OCI as well as those reclassified from accumulated other comprehensive income (loss) into interest income were included components in the assessment of hedge effectiveness.
Gain (loss) on derivative instruments not designated as hedging instruments	The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income during the twelve months ended December 31, 2023, 2022, and 2021: Consolidated Statements of Income Category of For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Derivative Instruments Interest rate-related and other instruments — customer and mirror, net Capital markets, net $ 392 $ 515 $ 2,432 Interest rate-related instruments — MSRs hedge Mortgage banking, net (1,096) (12,622) — Foreign currency exchange forwards Capital markets, net 1,670 203 730 Commodity contracts Capital markets, net — (16) (1,316) Interest rate lock commitments (mortgage) Mortgage banking, net 353 (2,531) (7,007) Forward commitments (mortgage) Mortgage banking, net (627) (123) 2,075

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2023
Offsetting [Abstract]
Balance Sheet Offsetting of Derivative Assets and Liabilities	The interest rate 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 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) Gross Amounts Recognized Derivative Liabilities Offset Cash Collateral Received Security Collateral Received Net Derivative assets December 31, 2023 $ 87,075 $ (18,234) $ (35,855) $ 32,985 $ (32,985) $ — December 31, 2022 63,029 (2,788) (26,898) 33,342 (30,753) 2,589 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) Gross Amounts Recognized Derivative Assets Offset Cash Collateral Pledged Security Collateral Pledged Net Derivative liabilities December 31, 2023 $ 18,767 $ (18,234) $ — $ 533 $ — $ 533 December 31, 2022 3,096 (2,788) (217) 91 — 91

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: ($ in thousands) December 31, 2023 December 31, 2022 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 11,170,147 $ 12,444,275 Commercial letters of credit (a) 3,697 3,188 Standby letters of credit (c) 212,029 270,692 (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 December 31, 2023 or 2022. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14. (c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $2 million and $3 million at December 31, 2023 and 2022, respectively, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in thousands) Year Ended December 31, 2023 Year Ended December 31, 2022 Allowance for unfunded commitments Balance at beginning of period $ 38,776 $ 39,776 Provision for unfunded commitments (4,000) (1,000) Balance at end of period $ 34,776 $ 38,776

Parent Company Only Financial_2

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Parent Company Balance Sheet	Balance Sheets December 31, ($ in thousands) 2023 2022 Assets Cash and due from banks $ 22,473 $ 14,899 Interest-bearing deposits in other financial institutions 20,428 29,856 Notes and interest receivable from subsidiaries 562,640 172,066 Investments in and receivable due from subsidiaries 4,080,536 4,036,273 Other assets 48,589 48,097 Total assets $ 4,734,666 $ 4,301,191 Liabilities and Stockholders' Equity Commercial paper $ — $ 20,798 Subordinated notes, at par 550,000 250,000 Long-term funding capitalized costs and fair value hedge liability (9,114) (2,399) Total long-term funding 540,886 247,601 Accrued expenses and other liabilities 19,807 17,301 Total liabilities 560,693 285,701 Preferred equity 194,112 194,112 Common equity 3,979,861 3,821,378 Total stockholders’ equity 4,173,973 4,015,490 Total liabilities and stockholders’ equity $ 4,734,666 $ 4,301,191
Parent Company Income Statement	Statements of Income For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Income Income from subsidiaries $ 192,559 $ 373,581 $ 361,198 Interest income on notes receivable from subsidiaries 30,363 5,632 3,247 Other income 1,175 1,262 682 Total income 224,097 380,475 365,127 Expense Interest expense on short and long-term funding 36,081 10,655 10,942 Other expense 7,352 6,118 7,330 Total expense 43,434 16,772 18,272 Income before income tax expense 180,663 363,702 346,856 Income tax (benefit) (2,292) (2,420) (4,138) Net income 182,956 366,122 350,994 Preferred stock dividends 11,500 11,500 17,111 Net income available to common equity $ 171,456 $ 354,622 $ 333,883
Parent Company Statement of Cash Flows	Statements of Cash Flows For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Cash Flows from Operating Activities Net income $ 182,956 $ 366,122 $ 350,994 Adjustments to reconcile net income to net cash provided by operating activities: (Increase) decrease in equity in undistributed net income (loss) of subsidiaries 107,441 (343,582) 28,802 Net change in other assets and accrued expenses and other liabilities (35,863) 14,159 17,102 Net cash provided by operating activities 254,534 36,699 396,898 Cash Flows from Investing Activities Net (increase) decrease in notes receivable from subsidiaries (385,000) 115,000 20,000 Net cash provided by (used in) investing activities (385,000) 115,000 20,000 Cash Flows from Financing Activities Net (decrease) in commercial paper (20,798) (13,932) (24,616) Proceeds from issuance of long-term funding 292,740 — — Proceeds from issuance of common stock for stock-based compensation plans 4,297 11,061 25,702 Redemption of preferred stock — — (164,458) Purchase of treasury stock, open market purchases — — (132,955) Purchase of treasury stock, stock-based compensation plans (6,593) (6,480) (4,847) Cash dividends on common stock (129,534) (123,137) (116,061) Cash dividends on preferred stock (11,500) (11,500) (17,111) Other — (938) — Net cash used in financing activities 128,612 (144,928) (434,346) Net increase (decrease) in cash and cash equivalents (1,854) 6,771 (17,448) Cash and cash equivalents at beginning of year 44,755 37,984 55,432 Cash and cash equivalents at end of year $ 42,901 $ 44,755 $ 37,984

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
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 December 31, 2023 and 2022, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in thousands) Fair Value Hierarchy December 31, 2023 December 31, 2022 Assets AFS investment securities: U.S. Treasury securities Level 1 $ 35,902 $ 109,378 Agency securities Level 2 — 13,532 Obligations of state and political subdivisions (municipal securities) Level 2 91,817 230,714 Residential mortgage-related securities: FNMA/FHLMC Level 2 1,120,794 1,604,610 GNMA Level 2 2,042,675 497,596 Commercial mortgage-related securities: FNMA/FHLMC Level 2 16,937 17,142 GNMA Level 2 154,793 110,462 Asset backed securities: FFELP Level 2 133,975 151,191 SBA Level 2 1,051 4,477 Other debt securities Level 2 2,950 2,922 Total AFS investment securities Level 1 $ 35,902 $ 109,378 Total AFS investment securities Level 2 3,564,990 2,632,647 Equity securities with readily determinable fair values Level 1 6,883 5,991 Residential loans held for sale Level 2 33,011 20,383 Mortgage servicing rights, net Level 3 84,390 77,351 Interest rate-related instruments designated as hedging instruments (a) Level 2 8,075 4,349 Foreign currency exchange forwards designated as hedging instruments (a) Level 2 632 416 Interest rate-related and other instruments not designated as hedging instruments (a) Level 2 111,623 62,401 Foreign currency exchange forwards not designated as hedging instruments (a) Level 2 2,954 437 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 439 86 Liabilities Interest rate-related instruments designated as hedging instruments (a) Level 2 $ 930 $ 1,260 Foreign currency exchange forwards designated as hedging instruments (a) Level 2 2,946 972 Interest rate-related and other instruments not designated as hedging instruments (a) Level 2 195,662 251,398 Foreign currency exchange forwards not designated as hedging instruments (a) Level 2 2,746 402 Forward commitments to sell residential mortgage loans Level 3 673 46 (a) Figures are presented gross before netting. See Note 14 and Note 15 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.
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 years ended December 31, 2023 and 2022, for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ in thousands) Interest rate lock commitments to originate residential mortgage loans held for sale Forward commitments to sell residential mortgage loans Total Balance December 31, 2021 $ 2,617 $ (30) $ 2,647 New production 10,442 (2,028) 12,470 Closed loans / settlements (913) 24,766 (25,679) Other (12,060) (22,662) 10,603 Change in mortgage derivative (2,531) 76 (2,607) Balance December 31, 2022 $ 86 $ 46 $ 40 New production $ 6,557 $ (1,816) $ 8,373 Closed loans / settlements (4,171) 2,494 (6,665) Other (2,033) (51) (1,982) Change in mortgage derivative 352 627 (274) Balance December 31, 2023 $ 439 $ 673 $ (234)
Equity Securities without Readily Determinable Fair Value	Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of December 31, 2023: ($ in thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2022 $ 19,225 Carrying value changes 5,785 Purchases 10,011 Sales (252) Carrying value as of December 31, 2023 $ 34,769 Cumulative upward carrying value changes between January 1, 2018 and December 31, 2023 $ 24,671 Cumulative downward carrying value changes between January 1, 2018 and December 31, 2023 $ —
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: ($ in thousands) Fair Value Hierarchy Fair Value Consolidated Statements of Income Category of Adjustment Recognized on the Consolidated Statements of Income (a) December 31, 2023 Assets Individually evaluated loans (b) Level 3 $ 47,221 Provision for credit losses $ 45,709 OREO (c) Level 2 3,139 Other noninterest expense / provision for credit losses (d) 2,532 Equity securities without readily determinable fair values Level 3 24,671 Investment securities gains (losses), net 5,785 December 31, 2022 Assets Individually evaluated loans (b) Level 3 $ 23,584 Provision for credit losses $ 4,405 OREO (c) Level 2 2,196 Other noninterest expense / provision for credit losses (d) 971 Equity securities without readily determinable fair values Level 3 19,134 Investment securities gains (losses), net 5,690 (a) Includes the full year impact on the consolidated statements of income. (b) On January 1, 2023, the Corporation adopted ASU 2022-02. Under this update, TDRs were eliminated and replaced with a modified loan classification which were no longer individually evaluated. As a result, amounts reported for 2023 and forward will not be comparable to prior period reported amounts. (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. (d) When a property's value is written down at the time it is transferred to OREO, the charge off is booked to the provision for credit losses. When a property is already in OREO and subsequently written down, the charge off is booked to other noninterest expense.
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 the unobservable inputs that are readily quantifiable pertaining to Level 3 measurements: December 31, 2023 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Option adjusted spread 6% - 8% 6% Mortgage servicing rights Discounted cash flow Constant prepayment rate 1% - 100% 4% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 18% - 53% 53% Interest rate lock commitments to originate residential mortgage loans held for sale Discounted cash flow Closing ratio 31% - 100% 89%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: December 31, 2023 December 31, 2022 ($ in thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 484,384 $ 484,384 $ 436,952 $ 436,952 Interest-bearing deposits in other financial institutions Level 1 425,089 425,089 156,693 156,693 Federal funds sold and securities purchased under agreements to resell Level 1 14,350 14,350 27,810 27,810 AFS investment securities Level 1 35,902 35,902 109,378 109,378 AFS investment securities Level 2 3,564,990 3,564,990 2,632,647 2,632,647 HTM investment securities, net Level 1 999 963 999 936 HTM investment securities, net Level 2 3,859,161 3,379,586 3,959,399 3,400,028 Equity securities with readily determinable fair values Level 1 6,883 6,883 5,991 5,991 Equity securities without readily determinable fair values (d) 10,000 10,000 — — Equity securities without readily determinable fair values Level 3 24,769 24,769 19,225 19,225 FHLB and Federal Reserve Bank stocks Level 2 229,171 229,171 295,496 295,496 Residential loans held for sale Level 2 33,011 33,011 20,383 20,383 Commercial loans held for sale Level 2 90,303 90,303 — — Loans, net Level 3 28,865,124 27,371,086 28,486,849 27,481,426 Bank and corporate owned life insurance Level 2 682,649 682,649 676,530 676,530 Mortgage servicing rights, net Level 3 84,390 84,390 77,351 77,351 Derivatives (other assets) (a) Level 2 123,284 123,284 67,603 67,603 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 439 439 86 86 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 26,130,076 $ 26,130,076 $ 27,705,996 $ 27,705,996 Brokered CDs and other time deposits (b) Level 2 7,315,973 7,315,973 1,930,158 1,930,158 Short-term funding Level 2 326,780 326,757 605,937 605,205 FHLB advances Level 2 1,940,194 1,944,600 4,319,861 4,322,264 Other long-term funding Level 2 541,269 534,983 248,071 242,151 Standby letters of credit (c) Level 2 2,157 2,157 2,881 2,881 Derivatives (accrued expenses and other liabilities) (a) Level 2 202,285 202,285 254,033 254,033 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 673 673 46 46 (a) Figures are presented gross before netting. See Note 14 and Note 15 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. (b) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (c) The commitment on standby letters of credit was $212 million and $271 million at December 31, 2023 and 2022, respectively. See Note 16 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (d) These securities are measured at fair value using Net Asset Value per share (or its equivalent) as a practical expedient.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2023
Banking and Thrift, Other Disclosure [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The actual capital amounts and ratios of the Corporation and its significant subsidiary are presented below. No deductions from capital were made for interest rate risk in 2023 or 2022. Actual For Capital Adequacy To Be Well Capitalized Under Prompt Corrective Action Provisions (a) ($ in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31 , 2023 Associated Banc-Corp Total capital $ 3,997,205 12.21 % $ 2,618,596 ≥ 8.00 % Tier 1 capital 3,269,050 9.99 % 1,963,947 ≥ 6.00 % CET1 3,074,938 9.39 % 1,472,960 ≥ 4.50 % Leverage 3,269,050 8.06 % 1,622,053 ≥ 4.00 % Associated Bank, N.A. Total capital $ 3,803,052 11.64 % $ 2,614,469 ≥ 8.00 % $ 3,268,086 ≥ 10.00 % Tier 1 capital 3,167,182 9.69 % 1,960,852 ≥ 6.00 % 2,614,469 ≥ 8.00 % CET1 3,167,182 9.69 % 1,470,639 ≥ 4.50 % 2,124,256 ≥ 6.50 % Leverage 3,167,182 7.82 % 1,620,970 ≥ 4.00 % 2,026,212 ≥ 5.00 % As of December 31 , 2022 Associated Banc-Corp Total capital $ 3,680,227 11.33 % $ 2,597,589 ≥ 8.00 % Tier 1 capital 3,229,690 9.95 % 1,948,192 ≥ 6.00 % CET1 3,035,578 9.35 % 1,461,144 ≥ 4.50 % Leverage 3,229,690 8.59 % 1,504,035 ≥ 4.00 % Associated Bank, N.A. Total capital $ 3,594,845 11.09 % $ 2,593,728 ≥ 8.00 % $ 3,242,160 ≥ 10.00 % Tier 1 capital 3,243,349 10.00 % 1,945,296 ≥ 6.00 % 2,593,728 ≥ 8.00 % CET1 3,243,349 10.00 % 1,458,972 ≥ 4.50 % 2,107,404 ≥ 6.50 % Leverage 3,243,349 8.63 % 1,503,666 ≥ 4.00 % 1,879,583 ≥ 5.00 % (a) Prompt corrective action provisions are not applicable at the bank holding company level.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2023
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 Years Ended December 31, ($ in thousands, except per share data) 2023 2022 2021 Net income $ 182,956 $ 366,122 $ 350,994 Preferred stock dividends (11,500) (11,500) (17,111) Net income available to common equity $ 171,456 $ 354,622 $ 333,883 Common shareholder dividends $ (128,748) $ (122,417) $ (115,212) Unvested share-based payment awards (785) (720) (849) Undistributed earnings $ 41,922 $ 231,485 $ 217,822 Undistributed earnings allocated to common shareholders $ 41,675 $ 229,995 $ 216,299 Undistributed earnings allocated to unvested share-based payment awards 247 1,490 1,523 Undistributed earnings $ 41,922 $ 231,485 $ 217,822 Basic Distributed earnings to common shareholders $ 128,748 $ 122,417 $ 115,212 Undistributed earnings allocated to common shareholders 41,675 229,995 216,299 Total common shareholders earnings, basic $ 170,424 $ 352,412 $ 331,510 Diluted Distributed earnings to common shareholders $ 128,748 $ 122,417 $ 115,212 Undistributed earnings allocated to common shareholders 41,675 229,995 216,299 Total common shareholders earnings, diluted $ 170,424 $ 352,412 $ 331,510 Weighted average common shares outstanding 149,968 149,162 150,773 Effect of dilutive common stock awards 892 1,334 1,214 Diluted weighted average common shares outstanding 150,860 150,496 151,987 Basic earnings per common share $ 1.14 $ 2.36 $ 2.20 Diluted earnings per common share $ 1.13 $ 2.34 $ 2.18

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ 958,046 $ 566,566 $ 361,634 Net intersegment interest income (expense) (391,276) (103,360) 18,001 Segment net interest income 566,769 463,205 379,636 Noninterest income 136,995 145,751 165,345 Total revenue 703,764 608,956 544,980 Provision for credit losses 55,801 49,543 60,311 Noninterest expense 248,926 234,234 219,655 Income before income taxes 399,037 325,179 265,015 Income tax expense 71,766 59,000 46,906 Net income $ 327,271 $ 266,179 $ 218,109 Allocated goodwill $ 525,836 $ 525,836 $ 525,836 Community, Consumer, and Business For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ 285,175 $ 322,725 $ 289,075 Net intersegment interest income 447,100 176,164 62,376 Segment net interest income 732,276 498,889 351,451 Noninterest income 108,858 118,848 151,474 Total revenue 841,133 617,737 502,925 Provision for credit losses 28,258 20,755 20,622 Noninterest expense 435,986 417,042 401,206 Income before income taxes 376,889 179,939 81,097 Income tax expense 79,147 37,787 17,030 Net income $ 297,742 $ 142,152 $ 64,067 Allocated goodwill $ 579,156 $ 579,156 $ 579,156 Risk Management and Shared Services For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ (203,647) $ 68,031 $ 75,146 Net intersegment (expense) (55,824) (72,803) (80,378) Segment net interest income (259,471) (4,772) (5,232) Noninterest income (182,671) 17,772 15,546 Total revenue (442,142) 12,999 10,314 Provision for credit losses (1,038) (37,300) (168,944) Noninterest expense 128,770 95,787 89,063 Income (loss) before income taxes (569,873) (45,488) 90,195 Income tax expense (benefit) (127,816) (3,279) 21,377 Net income (loss) $ (442,057) $ (42,209) $ 68,818 Allocated goodwill $ — $ — $ — Consolidated Total For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Net interest income $ 1,039,573 $ 957,321 $ 725,855 Net intersegment interest income — — — Segment net interest income 1,039,573 957,321 725,855 Noninterest income 63,182 282,370 332,364 Total revenue 1,102,756 1,239,691 1,058,219 Provision for credit losses 83,021 32,998 (88,011) Noninterest expense 813,682 747,063 709,924 Income before income taxes 206,052 459,630 436,307 Income tax expense 23,097 93,508 85,313 Net income $ 182,956 $ 366,122 $ 350,994 Allocated goodwill $ 1,104,992 $ 1,104,992 $ 1,104,992

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Summary of activity in accumulated other comprehensive income (loss)	The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2023, 2022, and 2021, respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in thousands) AFS Investment Securities Cash Flow Hedge Derivatives Defined Benefit Accumulated Balance, December 31, 2020 $ 41,325 $ — $ (28,707) $ 12,618 Other comprehensive income (loss) before reclassifications (63,714) — 25,519 (38,195) Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 16 — — 16 HTM investment securities, net, at amortized cost (a) 1,551 — — 1,551 Personnel expense — — 1,346 1,346 Other expense — — 4,594 4,594 Income tax (expense) benefit 15,557 — (7,803) 7,754 Net other comprehensive income (loss) during period (46,591) — 23,656 (22,935) Balance, December 31, 2021 $ (5,266) $ — $ (5,051) $ (10,317) Other comprehensive (loss) before reclassifications $ (250,273) $ — $ (51,745) $ (302,018) Unrealized (losses) on AFS securities transferred to HTM securities (67,604) — — (67,604) Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 1,922 — — 1,922 HTM investment securities, net, at amortized cost (a) 9,870 — — 9,870 Other assets / accrued expenses and other liabilities — 3,626 — 3,626 Interest income — (212) — (212) Personnel expense — — (325) (325) Other expense — — 658 658 Income tax (expense) benefit 78,159 (54) 13,495 91,601 Net other comprehensive income (loss) during period (227,926) 3,360 (37,917) (262,483) Balance, December 31, 2022 $ (233,192) $ 3,360 $ (42,968) $ (272,799) Other comprehensive income before reclassifications $ 41,145 $ — $ 24,091 $ 65,236 Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 64,940 — — 64,940 HTM investment securities, net, at amortized cost (a) 9,025 — — 9,025 Other assets / accrued expenses and other liabilities — (13,254) — (13,254) Interest income — 13,930 — 13,930 Personnel expense — — (326) (326) Other expense — — (29) (29) Income tax (expense) (30,560) (956) (6,304) (37,820) Net other comprehensive income (loss) during period 84,550 (280) 17,432 101,703 Balance, December 31, 2023 $ (148,641) $ 3,080 $ (25,535) $ (171,096)

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue Recognition [Abstract]
Disaggregation of Revenue [Table Text Block]	The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Wealth management fees $ 82,502 $ 84,122 $ 89,854 Service charges and deposit account fees 10,907 13,240 15,880 Card-based fees (a) 1,808 1,547 1,397 Other revenue 2,044 2,964 3,208 Noninterest income (in-scope of Topic 606) $ 97,261 $ 101,873 $ 110,340 Noninterest income (out-of-scope of Topic 606) 39,734 43,878 55,004 Total noninterest income $ 136,995 $ 145,751 $ 165,345 Community, Consumer, and Business For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Service charges and deposit account fees $ 38,115 $ 49,052 $ 48,493 Card-based fees (a) 43,286 42,474 41,730 Other revenue 7,082 7,069 10,719 Noninterest income (in-scope of Topic 606) $ 88,483 $ 98,595 $ 100,942 Noninterest income (out-of-scope of Topic 606) 20,375 20,253 50,532 Total noninterest income $ 108,858 $ 118,848 $ 151,474 Risk Management and Shared Services For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Service charges and deposit account fees $ 23 $ 18 $ 32 Card-based fees (a) 28 111 (3) Other revenue 764 1,356 967 Noninterest income (in-scope of Topic 606) $ 815 $ 1,485 $ 996 Noninterest income (out-of-scope of Topic 606) (183,486) 16,286 14,550 Total noninterest income $ (182,671) $ 17,772 $ 15,546 Consolidated Total For the Years Ended December 31, ($ in thousands) 2023 2022 2021 Wealth management fees $ 82,502 $ 84,122 $ 89,854 Service charges and deposit account fees 49,045 62,310 64,406 Card-based fees (a) 45,121 44,132 43,124 Other revenue 9,891 11,389 14,894 Noninterest income (in-scope of Topic 606) $ 186,560 $ 201,953 $ 212,278 Noninterest income (out-of-scope of Topic 606) (123,377) 80,417 120,086 Total noninterest income $ 63,182 $ 282,370 $ 332,364 (a) Certain card-based fees are out-of-scope of Topic 606.
Revenue Recognition 606 [Text Block]	Below is a listing of performance obligations for the Corporation's main revenue streams: Revenue Stream Noninterest Income In-Scope of Topic 606 Service charges and deposit account fees Service charges and deposit account fees consist of monthly service fees (i.e. business analyzed 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 and deposit account fees 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 the 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 and advisory fees (b) Brokerage and advisory 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. Payment for these services is 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 and advisory fees are included in wealth management fees.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting methodology change		$ 2,296
Core Deposits [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150%
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0%

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) branch	Dec. 31, 2022 USD ($) branch	Dec. 31, 2021 branch	Mar. 01, 2021 USD ($)	Feb. 26, 2021 USD ($) branch
Business Acquisition [Line Items]
Business Combinations, Number of Acquisitions | branch		0	0	0
Number of branches sold in disposition | branch		0	0
Deposits		$ 33,446,049	$ 29,636,154			$ 31,000
purchase premium on deposits						4%
disposed net branches | branch						1
Loans		$ 29,216,218	$ 28,799,569			$ 0
Whitnell
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 8,000
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax	$ 2,000

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	$ 3,749,814	$ 2,997,032
Debt Securities, Available-for-sale, Unrealized Gain	24,579	830
Debt Securities, Available-for-sale, Unrealized Loss	(173,501)	(255,837)
Debt Securities, Available-for-sale	3,600,892	2,742,025
HTM investment securities
Investment securities held to maturity	3,860,235	3,960,451
Gross Unrealized Gains	55,619	60,978
Held-to-maturity, Gross Unrealized Loss	(535,230)	(620,411)
Fair Value	3,380,624	3,401,018
US Treasury Securities [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	39,984	124,441
Debt Securities, Available-for-sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(4,083)	(15,063)
Debt Securities, Available-for-sale	35,902	109,378
HTM investment securities
Investment securities held to maturity	999	999
Gross Unrealized Gains	0	0
Held-to-maturity, Gross Unrealized Loss	(36)	(62)
Fair Value	963	936
Agency Securities [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost		15,000
Debt Securities, Available-for-sale, Unrealized Gain		0
Debt Securities, Available-for-sale, Unrealized Loss		(1,468)
Debt Securities, Available-for-sale		13,532
US States and Political Subdivisions Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	94,008	235,693
Debt Securities, Available-for-sale, Unrealized Gain	23	96
Debt Securities, Available-for-sale, Unrealized Loss	(2,214)	(5,074)
Debt Securities, Available-for-sale	91,817	230,714
HTM investment securities
Investment securities held to maturity	1,682,473	1,732,351
Gross Unrealized Gains	5,638	1,994
Held-to-maturity, Gross Unrealized Loss	(134,053)	(182,697)
Fair Value	1,554,059	1,551,647
Residential Related Securities | FNMA/FHLMC [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	1,274,052	1,820,642
Debt Securities, Available-for-sale, Unrealized Gain	294	404
Debt Securities, Available-for-sale, Unrealized Loss	(153,552)	(216,436)
Debt Securities, Available-for-sale	1,120,794	1,604,610
HTM investment securities
Investment securities held to maturity	941,973	961,231
Gross Unrealized Gains	27,007	31,301
Held-to-maturity, Gross Unrealized Loss	(164,587)	(175,760)
Fair Value	804,393	816,771
Residential Related Securities | Government National Mortgage Association (GNMA)
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	2,021,242	502,537
Debt Securities, Available-for-sale, Unrealized Gain	24,254	314
Debt Securities, Available-for-sale, Unrealized Loss	(2,822)	(5,255)
Debt Securities, Available-for-sale	2,042,675	497,596
HTM investment securities
Investment securities held to maturity	48,979	52,979
Gross Unrealized Gains	92	85
Held-to-maturity, Gross Unrealized Loss	(2,901)	(3,436)
Fair Value	46,170	49,628
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	0
Debt Securities, Available-for-sale	0
HTM investment securities
Investment securities held to maturity	345,083	364,728
Gross Unrealized Gains	9,796	11,697
Held-to-maturity, Gross Unrealized Loss	(65,372)	(72,920)
Fair Value	289,507	303,505
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	18,691	19,038
Debt Securities, Available-for-sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(1,755)	(1,896)
Debt Securities, Available-for-sale	16,937	17,142
HTM investment securities
Investment securities held to maturity	780,995	778,796
Gross Unrealized Gains	12,699	15,324
Held-to-maturity, Gross Unrealized Loss	(160,781)	(178,281)
Fair Value	632,914	615,839
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA)
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	161,928	115,031
Debt Securities, Available-for-sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(7,135)	(4,569)
Debt Securities, Available-for-sale	154,793	110,462
HTM investment securities
Investment securities held to maturity	59,733	69,369
Gross Unrealized Gains	386	577
Held-to-maturity, Gross Unrealized Loss	(7,500)	(7,254)
Fair Value	52,619	62,691
FFELP asset backed securities
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	135,832	157,138
Debt Securities, Available-for-sale, Unrealized Gain	5	0
Debt Securities, Available-for-sale, Unrealized Loss	(1,862)	(5,947)
Debt Securities, Available-for-sale	133,975	151,191
HTM investment securities
Investment securities held to maturity	0
Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	1,077	4,512
Debt Securities, Available-for-sale, Unrealized Gain	2	15
Debt Securities, Available-for-sale, Unrealized Loss	(28)	(51)
Debt Securities, Available-for-sale	1,051	4,477
HTM investment securities
Investment securities held to maturity	0
Fair Value	0
Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-sale, Amortized Cost	3,000	3,000
Debt Securities, Available-for-sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(50)	(78)
Debt Securities, Available-for-sale	$ 2,950	$ 2,922

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 2,395
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	42,606
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	64,728
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	27,263
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	136,992
Debt Securities, Available-for-Sale, Amortized Cost, Total	3,749,814	$ 2,997,032
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	2,372
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	38,464
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	62,839
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	26,993
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	130,669
Total debt securities, AFS Fair Value	$ 3,600,892	2,742,025
Ratio of Fair Value to Amortized Cost, AFS	96%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 6,099
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	52,391
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	157,279
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,467,704
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,683,472
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,860,235	3,960,451
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	6,096
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	52,328
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	153,795
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,342,803
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	1,555,022
Debt Securities, Held-to-maturity, Fair Value	$ 3,380,624	3,401,018
Ratio of Fair Value to Amortized Cost, HTM	87.60%
Residential Related Securities | FNMA/FHLMC [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 1,274,052	1,820,642
Fair Value
Total debt securities, AFS Fair Value	1,120,794	1,604,610
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	941,973	961,231
Fair Value
Debt Securities, Held-to-maturity, Fair Value	804,393	816,771
Residential Related Securities | Government National Mortgage Association (GNMA)
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	2,021,242	502,537
Fair Value
Total debt securities, AFS Fair Value	2,042,675	497,596
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	48,979	52,979
Fair Value
Debt Securities, Held-to-maturity, Fair Value	46,170	49,628
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	0
Fair Value
Total debt securities, AFS Fair Value	0
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	345,083	364,728
Fair Value
Debt Securities, Held-to-maturity, Fair Value	289,507	303,505
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	18,691	19,038
Fair Value
Total debt securities, AFS Fair Value	16,937	17,142
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	780,995	778,796
Fair Value
Debt Securities, Held-to-maturity, Fair Value	632,914	615,839
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA)
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	161,928	115,031
Fair Value
Total debt securities, AFS Fair Value	154,793	110,462
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	59,733	69,369
Fair Value
Debt Securities, Held-to-maturity, Fair Value	52,619	62,691
FFELP asset backed securities
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	135,832	157,138
Fair Value
Total debt securities, AFS Fair Value	133,975	151,191
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	1,077	4,512
Fair Value
Total debt securities, AFS Fair Value	1,051	$ 4,477
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-maturity, Fair Value	$ 0

Investment Securities, HTM Cred

Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 3,860,235	$ 3,960,451
Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,155	1,158
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	2,938,090	3,034,630
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	915,303	917,059
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	5,687	7,604
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	999	999
US Treasury Securities [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
US Treasury Securities [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	999	999
US Treasury Securities [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
US Treasury Securities [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,682,473	1,732,351
US States and Political Subdivisions Debt Securities [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,155	1,158
US States and Political Subdivisions Debt Securities [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	760,329	806,529
US States and Political Subdivisions Debt Securities [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	915,303	917,059
US States and Political Subdivisions Debt Securities [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	5,687	7,604
Residential Related Securities | FNMA/FHLMC [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	941,973	961,231
Residential Related Securities | FNMA/FHLMC [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | FNMA/FHLMC [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	941,973	961,231
Residential Related Securities | FNMA/FHLMC [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | FNMA/FHLMC [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | Government National Mortgage Association (GNMA)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	48,979	52,979
Residential Related Securities | Government National Mortgage Association (GNMA) | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | Government National Mortgage Association (GNMA) | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	48,979	52,979
Residential Related Securities | Government National Mortgage Association (GNMA) | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Residential Related Securities | Government National Mortgage Association (GNMA) | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	345,083	364,728
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	345,083	364,728
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	780,995	778,796
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	780,995	778,796
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member] | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	59,733	69,369
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	59,733	69,369
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 0	$ 0

Investment Securities, Gains, L

Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Gross realized gains on AFS securities		$ 83	$ 21	$ 421
Gross realized (losses) on AFS securities		(65,022)	(1,943)	(437)
Gain on sale and net write-up of equity securities		6,037	5,668	0
Investment securities gains (losses), net		(58,903)	3,746	(16)
Proceeds from sales of AFS investment securities	$ 51,000	$ 715,066	$ 110,177	$ 158,708

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	82	446
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (4,773)	$ (48,263)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 307,527	$ 847,391
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	213	121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (168,728)	$ (207,575)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,392,635	1,576,665
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(173,501)	(255,837)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,700,162	2,424,055
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,184)	(134,556)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	220,865	1,381,511
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(533,046)	(485,855)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	2,566,468	1,752,354
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(535,230)	(620,411)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 2,787,333	$ 3,133,865
US Treasury Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	1	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (4,083)	$ (15,063)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	35,902	109,378
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,083)	(15,063)
Debt Securities, Available-for-sale, Unrealized Loss Position	35,902	109,378
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(62)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	936
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(36)	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	963	0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(36)	(62)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 963	$ 936
Agency Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ (1,468)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		13,532
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(1,468)
Debt Securities, Available-for-sale, Unrealized Loss Position		$ 13,532
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	41	358
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (347)	$ (5,066)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 23,762	$ 201,260
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	92	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,867)	$ (8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	53,022	1,916
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2,214)	(5,074)
Debt Securities, Available-for-sale, Unrealized Loss Position	76,784	203,176
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,535)	(96,282)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	180,270	1,079,216
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(132,518)	(86,415)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	792,940	231,022
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(134,053)	(182,697)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	973,210	1,310,238
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(9,509)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	58,733
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(65,372)	(63,411)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	289,507	244,772
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(65,372)	(72,920)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 289,507	$ 303,505
FFELP asset backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ (1,668)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 44,304
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	14	12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,862)	$ (4,278)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	125,339	106,887
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,862)	(5,947)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 125,339	$ 151,191
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	5	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (28)	$ (50)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	761	2,057
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(28)	(51)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 761	$ 2,474
Debt Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (9)	$ (30)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 991	$ 1,970
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	2	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (42)	$ (49)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,958	951
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(50)	(78)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 2,950	$ 2,922
FNMA/FHLMC [Member] | Residential Related Securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	18	24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (333)	$ (31,266)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 22,870	$ 260,986
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	71	84
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (153,219)	$ (185,170)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,080,337	1,321,420
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(153,552)	(216,436)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,103,207	1,582,406
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(511)	(18,925)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	30,323	143,201
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(164,076)	(156,836)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	771,042	671,570
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(164,587)	(175,760)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 801,365	$ 814,770
FNMA/FHLMC [Member] | Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ (1,896)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 17,142
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	1	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,755)	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	16,937	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,755)	(1,896)
Debt Securities, Available-for-sale, Unrealized Loss Position	16,937	17,142
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(121)	(3,814)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	8,144	20,338
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(160,660)	(174,467)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	624,770	576,911
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(160,781)	(178,281)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 632,914	$ 597,249
Government National Mortgage Association (GNMA) | Residential Related Securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	13	23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (924)	$ (4,415)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 156,847	$ 220,276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	5	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,898)	$ (840)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	26,643	11,096
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2,822)	(5,255)
Debt Securities, Available-for-sale, Unrealized Loss Position	183,490	231,372
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(17)	(3,436)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,128	44,476
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,884)	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	34,626	0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(2,901)	(3,436)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 36,754	$ 44,476
Government National Mortgage Association (GNMA) | Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security	9	33
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (3,160)	$ (3,920)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 103,055	$ 101,036
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	22	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3,975)	$ (649)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	51,738	9,426
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(7,135)	(4,569)
Debt Securities, Available-for-sale, Unrealized Loss Position	154,793	110,462
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(2,528)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	34,612
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(7,500)	(4,726)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	52,619	28,080
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(7,500)	(7,254)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 52,619	$ 62,691
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	205	947
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | US Treasury Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	0	1
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | US States and Political Subdivisions Debt Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	182	771
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	0	3
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | FNMA/FHLMC [Member] | Residential Related Securities
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	20	79
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | FNMA/FHLMC [Member] | Commercial Mortgage-Backed Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1	4
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | Government National Mortgage Association (GNMA) | Residential Related Securities
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	2	81
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | Government National Mortgage Association (GNMA) | Commercial Mortgage-Backed Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	0	8
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	785	238
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | US Treasury Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1	0
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | US States and Political Subdivisions Debt Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	537	156
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	18	15
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | FNMA/FHLMC [Member] | Residential Related Securities
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	94	22
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | FNMA/FHLMC [Member] | Commercial Mortgage-Backed Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	44	39
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | Government National Mortgage Association (GNMA) | Residential Related Securities
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	78	0
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | Government National Mortgage Association (GNMA) | Commercial Mortgage-Backed Securities [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	13	6

Investment Securities (Details

Investment Securities (Details Textual) - USD ($) shares in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment Securities Information [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 715,000,000				$ 715,066,000	$ 110,177,000	$ 158,708,000
Visa B Shares, Amount Sold	1
Gain (Loss) on Sale of Investments	$ 65,000,000
Proceeds from sales of AFS investment securities				$ 51,000,000	715,066,000	110,177,000	$ 158,708,000
Debt Instrument, Collateral Amount	1,600,000,000	$ 2,300,000,000			1,600,000,000	2,300,000,000
Interest receivable	169,569,000	144,449,000			169,569,000	144,449,000
Debt Securities, Held-to-maturity, Nonaccrual, Interest Income					0	0
Debt Securities, HTM, Past Due Status	0	0			0	0
Held to maturity allowance for credit loss	(75,000)	(54,000)			(75,000)	(54,000)
Federal Home Loan Bank Stock	143,000,000	209,000,000			143,000,000	209,000,000
Federal Reserve Bank Stock	87,000,000	87,000,000			87,000,000	87,000,000
Equity Securities with Readily Determined Fair Value	7,000,000	6,000,000			7,000,000	6,000,000
Equity Securities without Readily Determinable Fair Value, Amount	35,000,000	19,000,000			35,000,000	19,000,000
FFELP asset backed securities
Investment Securities Information [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale			$ 107,000,000
Held-to-maturity Securities
Investment Securities Information [Line Items]
Interest receivable	18,000,000	19,000,000			18,000,000	19,000,000
Available-for-sale Securities [Member]
Investment Securities Information [Line Items]
Interest receivable	15,000,000	9,000,000			15,000,000	9,000,000
Federal Reserve Bank Stock [Member]
Investment Securities Information [Line Items]
Interest receivable	0	0			0	0
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Investment Securities Information [Line Items]
Interest receivable	4,000,000	3,000,000			4,000,000	3,000,000
US States and Political Subdivisions Debt Securities [Member]
Investment Securities Information [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale		110,000,000
Gain (Loss) on Sale of Investments		(2,000,000)
Visa B Shares
Investment Securities Information [Line Items]
Gain (Loss) on Sale of Investments	(6,000,000)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment Securities Information [Line Items]
Held to maturity allowance for credit loss	0	0			0	0
US Treasury Securities [Member]
Investment Securities Information [Line Items]
Held to maturity allowance for credit loss	0	0			0	0
US States and Political Subdivisions Debt Securities [Member]
Investment Securities Information [Line Items]
Held to maturity allowance for credit loss	$ 0	$ 0			$ 0	$ 0

Loans, Loan Composition (Detail

Loans, Loan Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Feb. 26, 2021
Loans and Leases Receivable [Line Items]
Loans	$ 29,216,218	$ 28,799,569	$ 0
Commercial and industrial
Loans and Leases Receivable [Line Items]
Loans	9,731,555	9,759,454
Commercial real estate - owner occupied
Loans and Leases Receivable [Line Items]
Loans	1,061,700	991,722
Commercial and business lending
Loans and Leases Receivable [Line Items]
Loans	10,793,255	10,751,176
Commercial real estate - investor
Loans and Leases Receivable [Line Items]
Loans	5,124,245	5,080,344
Real estate construction
Loans and Leases Receivable [Line Items]
Loans	2,271,398	2,155,222
Commercial real estate lending
Loans and Leases Receivable [Line Items]
Loans	7,395,644	7,235,565
Total commercial
Loans and Leases Receivable [Line Items]
Loans	18,188,898	17,986,742
Residential mortgage
Loans and Leases Receivable [Line Items]
Loans	7,864,891	8,511,550
Auto
Loans and Leases Receivable [Line Items]
Loans	2,256,162	1,382,073
Home equity
Loans and Leases Receivable [Line Items]
Loans	628,526	624,353
Other consumer
Loans and Leases Receivable [Line Items]
Loans	277,740	294,851
Total consumer
Loans and Leases Receivable [Line Items]
Loans	$ 11,027,319	$ 10,812,828

Loans, Related Party Loan Rollf

Loans, Related Party Loan Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$ 3,376	$ 45,245
New loans	2,564	2,656
Repayments	(253)	(1,416)
Change due to status of executive officers and directors	(280)	(43,110)
Balance at end of year	$ 5,406	$ 3,376

Loans, Credit Quality Indicator

Loans, Credit Quality Indicator by Vintage Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 18,966	$ 53,246
Financing Receivable, Revolving	2,712,389	2,915,297
Financing Receivable, Year One, Originated, Current Fiscal Year	5,363,890	8,854,510
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,307,956	7,341,574
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,039,862	3,469,992
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,556,071	2,201,004
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,578,023	1,082,280
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,658,026	2,934,912
Total	29,216,218	28,799,569
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	9,068
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	1,535
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	14,224
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	26,093
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	6,237
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	130
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	1,482
Charge Offs	58,768
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,204	47,152
Financing Receivable, Revolving	2,606,652	2,795,551
Financing Receivable, Year One, Originated, Current Fiscal Year	5,206,038	8,711,468
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,112,567	7,226,734
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	5,886,359	3,377,725
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,511,435	2,101,861
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,537,747	1,047,522
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,556,674	2,834,303
Total	28,417,472	28,095,164
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	205	52
Financing Receivable, Revolving	23,595	93,801
Financing Receivable, Year One, Originated, Current Fiscal Year	8,893	66,443
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	74,020	48,159
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	41,091	20,772
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,213	43,983
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	29,882	9,778
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	33,089	43,350
Total	216,784	326,286
Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	814	447
Financing Receivable, Revolving	81,910	25,889
Financing Receivable, Year One, Originated, Current Fiscal Year	131,753	59,240
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	92,784	36,709
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	68,695	56,016
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	27,253	51,043
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,387	19,637
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	27,183	18,118
Total	432,965	266,651
Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	7,744	5,595
Financing Receivable, Revolving	231	56
Financing Receivable, Year One, Originated, Current Fiscal Year	17,206	17,360
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	28,584	29,972
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	43,718	15,479
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,170	4,116
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,007	5,343
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	41,080	39,141
Total	148,997	111,467
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	8,598	44,208
Financing Receivable, Revolving	1,991,827	2,206,480
Financing Receivable, Year One, Originated, Current Fiscal Year	3,781,028	6,122,430
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,687,614	5,034,805
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,835,298	1,741,955
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,127,677	1,370,245
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	917,114	698,550
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	848,341	812,278
Total	18,188,898	17,986,742
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	295
Charge Offs	45,989
Total commercial | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,380	39,835
Financing Receivable, Revolving	1,887,439	2,087,396
Financing Receivable, Year One, Originated, Current Fiscal Year	3,626,800	5,990,879
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,508,651	4,924,743
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,691,830	1,656,149
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,093,633	1,275,996
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	884,162	669,213
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	788,529	750,399
Total	17,481,044	17,354,774
Total commercial | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	22,552	93,209
Financing Receivable, Year One, Originated, Current Fiscal Year	8,265	65,379
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	72,084	47,756
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	40,882	20,671
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,164	43,978
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	29,772	9,732
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	32,648	42,952
Total	212,368	323,677
Total commercial | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	804	447
Financing Receivable, Revolving	81,836	25,874
Financing Receivable, Year One, Originated, Current Fiscal Year	131,253	58,785
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	92,691	36,638
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	68,695	56,016
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	27,253	50,271
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,180	19,606
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	27,157	17,287
Total	432,063	264,476
Total commercial | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	6,414	3,926
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	14,710	7,387
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14,188	25,668
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	33,891	9,119
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	627	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6	1,640
Total	63,422	43,814
Total commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	8,598	5,796
Financing Receivable, Revolving	1,796,951	2,056,535
Financing Receivable, Year One, Originated, Current Fiscal Year	1,764,466	3,295,567
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,977,719	2,394,809
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,914,057	598,839
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	419,934	611,289
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	383,789	330,879
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	474,638	471,535
Total	9,731,555	9,759,454
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	18
Charge Offs	45,687
Total commercial | Commercial and industrial | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,380	1,423
Financing Receivable, Revolving	1,693,629	1,938,777
Financing Receivable, Year One, Originated, Current Fiscal Year	1,736,617	3,245,546
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,877,173	2,367,008
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,824,362	567,833
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	398,046	573,120
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	383,695	330,642
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	449,006	432,906
Total	9,362,529	9,455,833
Total commercial | Commercial and industrial | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	21,779	93,209
Financing Receivable, Year One, Originated, Current Fiscal Year	4,017	3,411
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	46,610	23,607
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,525	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,529	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	19
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	25,341	32,497
Total	109,801	152,744
Total commercial | Commercial and industrial | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	804	447
Financing Receivable, Revolving	81,543	24,549
Financing Receivable, Year One, Originated, Current Fiscal Year	10,515	41,400
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39,748	4,193
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	47,279	21,887
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	17,732	38,169
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	94	218
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	291	6,133
Total	197,202	136,549
Total commercial | Commercial and industrial | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	6,414	3,926
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	13,317	5,210
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14,188	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	33,891	9,119
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	627	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Total	62,022	14,329
Total commercial | Commercial real estate - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	15,957	13,772
Financing Receivable, Year One, Originated, Current Fiscal Year	220,168	212,883
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	190,794	236,769
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	251,783	170,624
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	147,708	172,630
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	138,816	83,570
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	96,473	101,475
Total	1,061,700	991,722
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0
Charge Offs	25
Total commercial | Commercial real estate - owner occupied | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	15,393	12,447
Financing Receivable, Year One, Originated, Current Fiscal Year	204,039	211,645
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	188,003	225,627
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	239,218	163,965
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	136,535	160,370
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	135,730	73,487
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	92,339	97,420
Total	1,011,259	944,961
Total commercial | Commercial real estate - owner occupied | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	271	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,150	1,136
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,635	1,491
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	9,713
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,293	0
Total	10,349	12,339
Total commercial | Commercial real estate - owner occupied | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	292	1,325
Financing Receivable, Year One, Originated, Current Fiscal Year	14,735	1,238
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,791	11,141
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,416	5,523
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	8,537	10,769
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,086	370
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,841	4,055
Total	38,699	34,422
Total commercial | Commercial real estate - owner occupied | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,394
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Total	1,394
Total commercial | Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	8,598	5,796
Financing Receivable, Revolving	1,812,909	2,070,307
Financing Receivable, Year One, Originated, Current Fiscal Year	1,984,635	3,508,450
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,168,514	2,631,578
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,165,840	769,463
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	567,642	783,919
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	522,606	414,449
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	571,111	573,010
Total	10,793,255	10,751,176
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	18
Charge Offs	45,713
Total commercial | Commercial and business lending | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,380	1,423
Financing Receivable, Revolving	1,709,023	1,951,224
Financing Receivable, Year One, Originated, Current Fiscal Year	1,940,657	3,457,191
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,065,177	2,592,636
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,063,580	731,798
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	534,581	733,490
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	519,426	404,129
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	541,345	530,326
Total	10,373,788	10,400,794
Total commercial | Commercial and business lending | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	22,050	93,209
Financing Receivable, Year One, Originated, Current Fiscal Year	4,017	3,411
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	46,610	23,607
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	14,675	1,136
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,164	1,491
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	9,732
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26,634	32,497
Total	120,150	165,083
Total commercial | Commercial and business lending | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	804	447
Financing Receivable, Revolving	81,836	25,874
Financing Receivable, Year One, Originated, Current Fiscal Year	25,250	42,638
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	42,539	15,335
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	53,695	27,410
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	26,269	48,938
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,180	589
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,132	10,188
Total	235,900	170,971
Total commercial | Commercial and business lending | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	6,414	3,926
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	14,710	5,210
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14,188	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	33,891	9,119
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	627	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Total	63,416	14,329
Total commercial | Commercial real estate - investor
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	38,412
Financing Receivable, Revolving	155,611	106,280
Financing Receivable, Year One, Originated, Current Fiscal Year	1,374,116	1,713,387
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,342,492	1,490,120
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,121,633	718,117
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	472,355	541,177
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	388,768	281,875
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	269,269	229,387
Total	5,124,245	5,080,344
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	252
Charge Offs	252
Total commercial | Commercial real estate - investor | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	38,412
Financing Receivable, Revolving	155,109	106,280
Financing Receivable, Year One, Originated, Current Fiscal Year	1,263,866	1,633,094
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,266,866	1,419,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,080,425	683,121
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	471,371	530,444
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	358,996	262,858
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	239,230	210,299
Total	4,835,865	4,845,096
Total commercial | Commercial real estate - investor | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	502	0
Financing Receivable, Year One, Originated, Current Fiscal Year	4,248	61,968
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	25,474	24,149
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26,208	7,361
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	9,400
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	29,772	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,014	10,455
Total	92,218	113,333
Total commercial | Commercial real estate - investor | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	106,002	16,147
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	50,152	21,303
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	15,000	27,635
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	983	1,333
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	19,017
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	24,025	7,099
Total	196,163	92,535
Total commercial | Commercial real estate - investor | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan		0
Financing Receivable, Revolving		0
Financing Receivable, Year One, Originated, Current Fiscal Year		2,177
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		25,668
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		1,535
Total		29,380
Total commercial | Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	23,307	29,892
Financing Receivable, Year One, Originated, Current Fiscal Year	422,277	900,593
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,176,608	913,107
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	547,825	254,374
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	87,680	45,149
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,740	2,226
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,960	9,880
Total	2,271,398	2,155,222
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	25
Charge Offs	25
Total commercial | Real estate construction | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	23,307	29,892
Financing Receivable, Year One, Originated, Current Fiscal Year	422,277	900,593
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,176,608	913,107
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	547,825	241,230
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	87,680	12,062
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,740	2,226
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,954	9,775
Total	2,271,392	2,108,885
Total commercial | Real estate construction | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan		0
Financing Receivable, Revolving		0
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		12,174
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		33,087
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Total		45,261
Total commercial | Real estate construction | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan		0
Financing Receivable, Revolving		0
Financing Receivable, Year One, Originated, Current Fiscal Year		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year		970
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Total		970
Total commercial | Real estate construction | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6	105
Total	6	105
Total commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	38,412
Financing Receivable, Revolving	178,918	136,173
Financing Receivable, Year One, Originated, Current Fiscal Year	1,796,393	2,613,980
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,519,100	2,403,227
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,669,458	972,492
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	560,035	586,326
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	394,508	284,101
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	277,230	239,267
Total	7,395,644	7,235,565
Total commercial | Commercial Real Estate | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	38,412
Financing Receivable, Revolving	178,416	136,173
Financing Receivable, Year One, Originated, Current Fiscal Year	1,686,143	2,533,687
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,443,474	2,332,107
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,628,250	924,351
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	559,052	542,505
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	364,737	265,083
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	247,184	220,073
Total	7,107,256	6,953,981
Total commercial | Commercial Real Estate | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	502	0
Financing Receivable, Year One, Originated, Current Fiscal Year	4,248	61,968
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	25,474	24,149
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26,208	19,535
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	42,487
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	29,772	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,014	10,455
Total	92,218	158,595
Total commercial | Commercial Real Estate | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	106,002	16,147
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	50,152	21,303
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	15,000	28,605
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	983	1,333
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	19,017
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	24,025	7,099
Total	196,163	93,505
Total commercial | Commercial Real Estate | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0	2,177
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	25,668
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6	1,640
Total	6	29,485
Total commercial | Commercial Real Estate Lending [Member]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	277
Charge Offs	277
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,369	9,038
Financing Receivable, Revolving	720,563	708,817
Financing Receivable, Year One, Originated, Current Fiscal Year	1,582,862	2,732,080
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,620,341	2,306,769
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,204,564	1,728,037
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,428,395	830,759
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	660,909	383,731
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,809,685	2,122,635
Total	11,027,319	10,812,828
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,937
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	818
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	4,630
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	823
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	279
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	105
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	1,187
Charge Offs	12,779
Total consumer | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	8,824	7,318
Financing Receivable, Revolving	719,213	708,154
Financing Receivable, Year One, Originated, Current Fiscal Year	1,579,238	2,720,589
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,603,916	2,301,991
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,194,529	1,721,576
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,417,802	825,866
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	653,584	378,310
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,768,145	2,083,904
Total	10,936,428	10,740,390
Total consumer | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	205	52
Financing Receivable, Revolving	1,043	592
Financing Receivable, Year One, Originated, Current Fiscal Year	628	1,063
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,936	403
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	208	101
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	49	5
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	110	47
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	441	398
Total	4,416	2,609
Total consumer | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10	0
Financing Receivable, Revolving	75	15
Financing Receivable, Year One, Originated, Current Fiscal Year	500	455
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	93	71
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	772
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	207	31
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26	831
Total	901	2,175
Total consumer | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,330	1,668
Financing Receivable, Revolving	231	56
Financing Receivable, Year One, Originated, Current Fiscal Year	2,496	9,973
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14,396	4,304
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	9,827	6,360
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,544	4,116
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,007	5,343
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	41,073	37,501
Total	85,574	67,654
Total consumer | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	354,236	1,419,527
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,627,070	2,188,332
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,119,836	1,722,979
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,424,583	821,645
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	654,675	375,768
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,684,490	1,983,299
Total	7,864,891	8,511,550
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	32
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	42
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	148
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	723
Charge Offs	952
Total consumer | Residential mortgage | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	352,321	1,410,566
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,617,409	2,184,125
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,110,577	1,716,663
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,414,186	817,164
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	647,778	370,724
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,650,542	1,951,406
Total	7,792,813	8,450,648
Total consumer | Residential mortgage | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	284
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	96
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	95	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	57	63
Total	152	444
Total consumer | Residential mortgage | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	490	455
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	93	71
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	738
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	174	29
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26	685
Total	784	1,978
Total consumer | Residential mortgage | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,425	8,506
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	9,567	3,851
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	9,259	6,219
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,397	3,744
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,628	5,014
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	33,865	31,145
Total	71,142	58,480
Total consumer | Auto
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,220,471	1,273,406
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	959,094	106,551
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	75,844	333
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	163	1,276
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	458	446
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	132	61
Total	2,256,162	1,382,073
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	795
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	4,524
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	626
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0
Charge Offs	5,950
Total consumer | Auto | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,218,820	1,271,205
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	952,912	106,102
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	75,209	333
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	163	1,267
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	456	446
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	132	61
Total	2,247,691	1,379,414
Total consumer | Auto | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	619	1,052
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,850	118
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	205	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Total	2,674	1,170
Total consumer | Auto | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,032	1,149
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,332	331
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	430	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	9
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Total	5,797	1,490
Total consumer | Home Equity Loan
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,195	8,891
Financing Receivable, Revolving	521,434	508,329
Financing Receivable, Year One, Originated, Current Fiscal Year	1,717	31,695
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	30,445	6,610
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,217	2,243
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,500	6,538
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,308	7,333
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	60,907	61,605
Total	628,526	624,353
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	53
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	21
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	3
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	31
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	22
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	294
Charge Offs	424
Total consumer | Home Equity Loan | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	8,703	7,254
Financing Receivable, Revolving	521,000	508,212
Financing Receivable, Year One, Originated, Current Fiscal Year	1,678	31,389
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	29,863	6,508
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,084	2,112
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,327	6,197
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,891	6,966
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	53,350	54,827
Total	619,192	616,211
Total consumer | Home Equity Loan | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	179	47
Financing Receivable, Revolving	200	102
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	87	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	29	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	15	47
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	378	310
Total	708	458
Total consumer | Home Equity Loan | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10	0
Financing Receivable, Revolving	75	15
Financing Receivable, Year One, Originated, Current Fiscal Year	10	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	34
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	33	2
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	146
Total	118	197
Total consumer | Home Equity Loan | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,302	1,590
Financing Receivable, Revolving	160	0
Financing Receivable, Year One, Originated, Current Fiscal Year	29	306
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	495	102
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	132	131
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	144	307
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	368	319
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,180	6,322
Total	8,508	7,487
Total consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	174	147
Financing Receivable, Revolving	199,129	200,488
Financing Receivable, Year One, Originated, Current Fiscal Year	6,438	7,452
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,733	5,276
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,668	2,482
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,149	1,300
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	468	184
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	64,156	77,670
Total	277,740	294,851
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,884
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	72
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	124
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	131
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	72
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	170
Charge Offs	5,453
Total consumer | Other consumer | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	121	64
Financing Receivable, Revolving	198,214	199,942
Financing Receivable, Year One, Originated, Current Fiscal Year	6,419	7,429
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,732	5,256
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,658	2,468
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,127	1,238
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	460	174
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	64,121	77,611
Total	276,731	294,117
Total consumer | Other consumer | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	26	6
Financing Receivable, Revolving	843	490
Financing Receivable, Year One, Originated, Current Fiscal Year	9	11
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3	5
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	20	5
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6	25
Total	881	537
Total consumer | Other consumer | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	27	78
Financing Receivable, Revolving	71	56
Financing Receivable, Year One, Originated, Current Fiscal Year	10	11
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1	21
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6	10
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2	56
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8	10
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	29	34
Total	$ 128	$ 197

Loans, Loans by Past Due Status

Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Feb. 26, 2021
Summarized details of Loans
Financing Receivable, Not Past Due Status	$ 28,983,708	$ 28,652,257
Financing Receivable, Recorded Investment, Nonaccrual Status	148,997	111,467
Loans	29,216,218	28,799,569	$ 0
Nonaccrual Loans, Current Portion	$ 80,000	$ 64,000
Percent of current nonaccrual loans	53%	58%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	23,000	11,000
30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	38,113	26,256
60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	23,712	7,861
90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	21,689	1,728
Commercial and industrial
Summarized details of Loans
Financing Receivable, Not Past Due Status	9,663,587	9,738,561
Financing Receivable, Recorded Investment, Nonaccrual Status	62,022	14,329
Loans	9,731,555	9,759,454
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,374	716
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	191	5,566
Commercial and industrial | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	380	282
Commercial real estate - owner occupied
Summarized details of Loans
Financing Receivable, Not Past Due Status	1,059,948	991,493
Financing Receivable, Recorded Investment, Nonaccrual Status	1,394	0
Loans	1,061,700	991,722
Commercial real estate - owner occupied | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	218
Commercial real estate - owner occupied | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	358	12
Commercial real estate - owner occupied | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Commercial and business lending
Summarized details of Loans
Financing Receivable, Not Past Due Status	10,723,536	10,730,053
Financing Receivable, Recorded Investment, Nonaccrual Status	63,416	14,329
Loans	10,793,255	10,751,176
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,374	934
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	549	5,578
Commercial and business lending | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	380	282
Commercial real estate - investor
Summarized details of Loans
Financing Receivable, Not Past Due Status	5,086,117	5,049,897
Financing Receivable, Recorded Investment, Nonaccrual Status	0	29,380
Loans	5,124,245	5,080,344
Commercial real estate - investor | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	1,067
Commercial real estate - investor | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	18,697	0
Commercial real estate - investor | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	19,432	0
Real estate construction
Summarized details of Loans
Financing Receivable, Not Past Due Status	2,271,392	2,155,077
Financing Receivable, Recorded Investment, Nonaccrual Status	6	105
Loans	2,271,398	2,155,222
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	39
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Real estate construction | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Commercial real estate lending
Summarized details of Loans
Financing Receivable, Not Past Due Status	7,357,509	7,204,975
Financing Receivable, Recorded Investment, Nonaccrual Status	6	29,485
Loans	7,395,644	7,235,565
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	1,105
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	18,697	0
Commercial real estate lending | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	19,432	0
Total commercial
Summarized details of Loans
Financing Receivable, Not Past Due Status	18,081,044	17,935,028
Financing Receivable, Recorded Investment, Nonaccrual Status	63,422	43,814
Loans	18,188,898	17,986,742
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,374	2,040
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	19,246	5,578
Total commercial | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	19,812	282
Residential mortgage
Summarized details of Loans
Financing Receivable, Not Past Due Status	7,780,304	8,443,072
Financing Receivable, Recorded Investment, Nonaccrual Status	71,142	58,480
Loans	7,864,891	8,511,550
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	13,294	9,811
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	152	63
Residential mortgage | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	124
Auto
Summarized details of Loans
Financing Receivable, Not Past Due Status	2,232,906	1,371,176
Financing Receivable, Recorded Investment, Nonaccrual Status	5,797	1,490
Loans	2,256,162	1,382,073
Auto | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	14,712	8,238
Auto | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	2,674	1,170
Auto | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	73	0
Home equity
Summarized details of Loans
Financing Receivable, Not Past Due Status	615,810	611,259
Financing Receivable, Recorded Investment, Nonaccrual Status	8,508	7,487
Loans	628,526	624,353
Home equity | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	3,500	5,149
Home equity | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	708	458
Home equity | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Other consumer
Summarized details of Loans
Financing Receivable, Not Past Due Status	273,644	291,722
Financing Receivable, Recorded Investment, Nonaccrual Status	128	197
Loans	277,740	294,851
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,233	1,018
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	932	592
Other consumer | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,803	1,322
Total consumer
Summarized details of Loans
Financing Receivable, Not Past Due Status	10,902,664	10,717,229
Financing Receivable, Recorded Investment, Nonaccrual Status	85,574	67,654
Loans	11,027,319	10,812,828
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	32,739	24,216
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	4,467	2,283
Total consumer | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	$ 1,876	$ 1,446

Loans, Modifications (Details)

Loans, Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term, Range, From	175 months
Financing Receivable, Modified, Weighted Average Term, Range, To	245 months
Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 2,087
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(11.00%)
Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 233
Financing Receivable, Modified, Weighted Average Term Increase from Modification	71 months
Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 1,204
Commercial and industrial | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 306
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(19.00%)
Residential mortgage | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	1%
Residential mortgage | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 208
Financing Receivable, Modified, Weighted Average Term Increase from Modification	65 months
Residential mortgage | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 865
Auto | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 255
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(9.00%)
Home Equity Loan | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 77
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	0%
Home Equity Loan | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 25
Financing Receivable, Modified, Weighted Average Term Increase from Modification	85 months
Home Equity Loan | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 339
Other consumer | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 1,449
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(21.00%)

Loans, Modifications in Last 12

Loans, Modifications in Last 12 Months, Performance (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	$ 2,636
Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	83
90+ Days Past Due
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Financial Asset, Nonaccrual [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	805
Commercial and industrial | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	306
Commercial and industrial | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Commercial and industrial | 90+ Days Past Due
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Commercial and industrial | Financial Asset, Nonaccrual [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Residential mortgage | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	405
Residential mortgage | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Residential mortgage | 90+ Days Past Due
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Residential mortgage | Financial Asset, Nonaccrual [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	668
Auto | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	218
Auto | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	36
Auto | 90+ Days Past Due
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Auto | Financial Asset, Nonaccrual [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Home Equity Loan | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	258
Home Equity Loan | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	47
Home Equity Loan | 90+ Days Past Due
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Home Equity Loan | Financial Asset, Nonaccrual [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	137
Other consumer | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	1,449
Other consumer | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Other consumer | 90+ Days Past Due
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0
Other consumer | Financial Asset, Nonaccrual [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	$ 0

Loans, Modified, Subsequent Def

Loans, Modified, Subsequent Default (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	$ 0
Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	208
Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	275
Residential mortgage | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0
Residential mortgage | Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	208
Residential mortgage | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	248
Home Equity Loan | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0
Home Equity Loan | Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0
Home Equity Loan | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	$ 27

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 32,868
Nonaccrual Restructured Loans	20,127
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	12,453
Nonaccrual Restructured Loans	0
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	316
Nonaccrual Restructured Loans	0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	128
Nonaccrual Restructured Loans	2,074
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	195
Nonaccrual Restructured Loans	9
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	16,829
Nonaccrual Restructured Loans	17,117
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	2,148
Nonaccrual Restructured Loans	927
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	798
Nonaccrual Restructured Loans	$ 0

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring, Summary (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	72
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 11,370
Unpaid Principal Balance(b)	$ 11,616
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 281
Unpaid Principal Balance(b)	$ 281
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	55
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 10,557
Unpaid Principal Balance(b)	$ 10,777
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	15
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 531
Unpaid Principal Balance(b)	$ 557

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) - Residential mortgage $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4
Financing Receivable, Modified, Subsequent Default | $	$ 1,178

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ 58,768
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	38,776	$ 39,776
Provision for unfunded commitments	(4,000)	(1,000)
Balance at end of period	34,776	38,776	$ 39,776
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	58,768
Provision for credit losses	83,021	32,998	(88,011)
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	312,720	280,015
Charge Offs	(58,768)	(10,146)
Recoveries	10,142	8,852
Net Charge offs	(48,626)	(1,294)
Provision for loan losses	87,000	34,000
Financing Receivable, Allowance for Credit Loss, Ending Balance	351,094	312,720	280,015
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(58,768)	(10,146)
Recoveries	10,142	8,852
Net Charge offs	(48,626)	(1,294)
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	119,076	89,857
Charge Offs	(45,687)	(4,491)
Recoveries	3,015	5,282
Net Charge offs	(42,672)	791
Provision for loan losses	51,859	28,428
Financing Receivable, Allowance for Credit Loss, Ending Balance	128,263	119,076	89,857
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(45,687)	(4,491)
Recoveries	3,015	5,282
Net Charge offs	(42,672)	791
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	9,475	11,473
Charge Offs	(25)	0
Recoveries	11	13
Net Charge offs	(15)	13
Provision for loan losses	1,150	(2,011)
Financing Receivable, Allowance for Credit Loss, Ending Balance	10,610	9,475	11,473
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(25)	0
Recoveries	11	13
Net Charge offs	(15)	13
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	128,551	101,330
Charge Offs	(45,713)	(4,491)
Recoveries	3,026	5,295
Net Charge offs	(42,687)	804
Provision for loan losses	53,009	26,418
Financing Receivable, Allowance for Credit Loss, Ending Balance	138,873	128,551	101,330
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(45,713)	(4,491)
Recoveries	3,026	5,295
Net Charge offs	(42,687)	804
Allowance for Loan Losses [Member] | Commercial real estate - investor
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	54,398	72,803
Charge Offs	(252)	(50)
Recoveries	3,016	50
Net Charge offs	2,763	0
Provision for loan losses	10,697	(18,405)
Financing Receivable, Allowance for Credit Loss, Ending Balance	67,858	54,398	72,803
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(252)	(50)
Recoveries	3,016	50
Net Charge offs	2,763	0
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	45,589	37,643
Charge Offs	(25)	(48)
Recoveries	80	106
Net Charge offs	55	58
Provision for loan losses	7,910	7,887
Financing Receivable, Allowance for Credit Loss, Ending Balance	53,554	45,589	37,643
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(25)	(48)
Recoveries	80	106
Net Charge offs	55	58
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	99,986	110,446
Charge Offs	(277)	(98)
Recoveries	3,095	156
Net Charge offs	2,819	58
Provision for loan losses	18,607	(10,518)
Financing Receivable, Allowance for Credit Loss, Ending Balance	121,412	99,986	110,446
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(277)	(98)
Recoveries	3,095	156
Net Charge offs	2,819	58
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	228,538	211,776
Charge Offs	(45,989)	(4,588)
Recoveries	6,121	5,451
Net Charge offs	(39,868)	862
Provision for loan losses	71,616	15,900
Financing Receivable, Allowance for Credit Loss, Ending Balance	260,285	228,538	211,776
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(45,989)	(4,588)
Recoveries	6,121	5,451
Net Charge offs	(39,868)	862
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	38,298	40,787
Charge Offs	(952)	(567)
Recoveries	541	908
Net Charge offs	(411)	341
Provision for loan losses	(79)	(2,830)
Financing Receivable, Allowance for Credit Loss, Ending Balance	37,808	38,298	40,787
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(952)	(567)
Recoveries	541	908
Net Charge offs	(411)	341
Allowance for Loan Losses [Member] | Auto
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	19,619	1,999
Charge Offs	(5,950)	(1,041)
Recoveries	1,241	98
Net Charge offs	(4,709)	(943)
Provision for loan losses	10,051	18,563
Financing Receivable, Allowance for Credit Loss, Ending Balance	24,961	19,619	1,999
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(5,950)	(1,041)
Recoveries	1,241	98
Net Charge offs	(4,709)	(943)
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	14,875	14,011
Charge Offs	(424)	(587)
Recoveries	1,262	1,385
Net Charge offs	837	798
Provision for loan losses	(310)	66
Financing Receivable, Allowance for Credit Loss, Ending Balance	15,403	14,875	14,011
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(424)	(587)
Recoveries	1,262	1,385
Net Charge offs	837	798
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	11,390	11,441
Charge Offs	(5,453)	(3,363)
Recoveries	978	1,010
Net Charge offs	(4,475)	(2,353)
Provision for loan losses	5,723	2,301
Financing Receivable, Allowance for Credit Loss, Ending Balance	12,638	11,390	11,441
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(5,453)	(3,363)
Recoveries	978	1,010
Net Charge offs	(4,475)	(2,353)
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	84,182	68,239
Charge Offs	(12,779)	(5,558)
Recoveries	4,021	3,401
Net Charge offs	(8,758)	(2,157)
Provision for loan losses	15,384	18,100
Financing Receivable, Allowance for Credit Loss, Ending Balance	90,809	84,182	68,239
Allowance for Credit Losses on Loans [Abstract]
Charge Offs	(12,779)	(5,558)
Recoveries	4,021	3,401
Net Charge offs	(8,758)	(2,157)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	38,776	39,776
Provision for unfunded commitments	(4,000)	(1,000)
Balance at end of period	34,776	38,776	39,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	12,997	18,459
Provision for unfunded commitments	321	(5,462)
Balance at end of period	13,319	12,997	18,459
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - owner occupied
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	103	208
Provision for unfunded commitments	46	(105)
Balance at end of period	149	103	208
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	13,101	18,667
Provision for unfunded commitments	367	(5,566)
Balance at end of period	13,468	13,101	18,667
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - investor
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	710	936
Provision for unfunded commitments	(230)	(226)
Balance at end of period	480	710	936
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	20,583	15,586
Provision for unfunded commitments	(3,558)	4,997
Balance at end of period	17,024	20,583	15,586
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	21,292	16,522
Provision for unfunded commitments	(3,788)	4,770
Balance at end of period	17,504	21,292	16,522
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	34,393	35,189
Provision for unfunded commitments	(3,421)	(796)
Balance at end of period	30,972	34,393	35,189
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	2,699	2,592
Provision for unfunded commitments	(70)	107
Balance at end of period	2,629	2,699	2,592
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	1,683	1,995
Provision for unfunded commitments	(509)	(311)
Balance at end of period	1,174	1,683	1,995
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	4,382	4,587
Provision for unfunded commitments	(579)	(204)
Balance at end of period	3,803	4,382	4,587
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	(58,768)	(10,146)
Recoveries	10,142	8,852
Net Charge offs	(48,626)	(1,294)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	351,496	319,791
Charge Offs	(58,768)	(10,146)
Recoveries	10,142	8,852
Net Charge offs	(48,626)	(1,294)
Provision for credit losses	83,000	33,000
Balance at end of period	$ 385,870	$ 351,496	319,791
Percent of Loans	1.32%	1.22%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (45,687)	$ (4,491)
Recoveries	3,015	5,282
Net Charge offs	(42,672)	791
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	132,073	108,316
Charge Offs	(45,687)	(4,491)
Recoveries	3,015	5,282
Net Charge offs	(42,672)	791
Provision for credit losses	52,181	22,967
Balance at end of period	$ 141,582	$ 132,073	108,316
Percent of Loans	1.45%	1.35%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (25)	$ 0
Recoveries	11	13
Net Charge offs	(15)	13
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	9,579	11,681
Charge Offs	(25)	0
Recoveries	11	13
Net Charge offs	(15)	13
Provision for credit losses	1,195	(2,115)
Balance at end of period	$ 10,759	$ 9,579	11,681
Percent of Loans	1.01%	0.97%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (45,713)	$ (4,491)
Recoveries	3,026	5,295
Net Charge offs	(42,687)	804
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	141,652	119,997
Charge Offs	(45,713)	(4,491)
Recoveries	3,026	5,295
Net Charge offs	(42,687)	804
Provision for credit losses	53,376	20,852
Balance at end of period	$ 152,341	$ 141,652	119,997
Percent of Loans	1.41%	1.32%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (252)	$ (50)
Recoveries	3,016	50
Net Charge offs	2,763	0
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	55,108	73,739
Charge Offs	(252)	(50)
Recoveries	3,016	50
Net Charge offs	2,763	0
Provision for credit losses	10,467	(18,631)
Balance at end of period	$ 68,338	$ 55,108	73,739
Percent of Loans	1.33%	1.08%
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (25)	$ (48)
Recoveries	80	106
Net Charge offs	55	58
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	66,171	53,229
Charge Offs	(25)	(48)
Recoveries	80	106
Net Charge offs	55	58
Provision for credit losses	4,351	12,884
Balance at end of period	$ 70,578	$ 66,171	53,229
Percent of Loans	3.11%	3.07%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (277)	$ (98)
Recoveries	3,095	156
Net Charge offs	2,819	58
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	121,279	126,968
Charge Offs	(277)	(98)
Recoveries	3,095	156
Net Charge offs	2,819	58
Provision for credit losses	14,819	(5,748)
Balance at end of period	$ 138,916	$ 121,279	126,968
Percent of Loans	1.88%	1.68%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (45,989)	$ (4,588)
Recoveries	6,121	5,451
Net Charge offs	(39,868)	862
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	262,931	246,965
Charge Offs	(45,989)	(4,588)
Recoveries	6,121	5,451
Net Charge offs	(39,868)	862
Provision for credit losses	68,195	15,104
Balance at end of period	$ 291,257	$ 262,931	246,965
Percent of Loans	1.60%	1.46%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (952)	$ (567)
Recoveries	541	908
Net Charge offs	(411)	341
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	38,298	40,787
Charge Offs	(952)	(567)
Recoveries	541	908
Net Charge offs	(411)	341
Provision for credit losses	(79)	(2,830)
Balance at end of period	$ 37,808	$ 38,298	40,787
Percent of Loans	0.48%	0.45%
Allowance for Loans Losses and Unfunded Commitments [Member] | Auto
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (5,950)	$ (1,041)
Recoveries	1,241	98
Net Charge offs	(4,709)	(943)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	19,619	1,999
Charge Offs	(5,950)	(1,041)
Recoveries	1,241	98
Net Charge offs	(4,709)	(943)
Provision for credit losses	10,051	18,563
Balance at end of period	$ 24,961	$ 19,619	1,999
Percent of Loans	1.11%	1.42%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (424)	$ (587)
Recoveries	1,262	1,385
Net Charge offs	837	798
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	17,574	16,603
Charge Offs	(424)	(587)
Recoveries	1,262	1,385
Net Charge offs	837	798
Provision for credit losses	(380)	173
Balance at end of period	$ 18,032	$ 17,574	16,603
Percent of Loans	2.87%	2.81%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (5,453)	$ (3,363)
Recoveries	978	1,010
Net Charge offs	(4,475)	(2,353)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	13,073	13,436
Charge Offs	(5,453)	(3,363)
Recoveries	978	1,010
Net Charge offs	(4,475)	(2,353)
Provision for credit losses	5,214	1,990
Balance at end of period	$ 13,812	$ 13,073	13,436
Percent of Loans	4.97%	4.43%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge Offs	$ (12,779)	$ (5,558)
Recoveries	4,021	3,401
Net Charge offs	(8,758)	(2,157)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	88,565	72,825
Charge Offs	(12,779)	(5,558)
Recoveries	4,021	3,401
Net Charge offs	(8,758)	(2,157)
Provision for credit losses	14,805	17,896
Balance at end of period	$ 94,613	$ 88,565	$ 72,825
Percent of Loans	0.86%	0.82%

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans Information [Line Items]
Interest receivable	$ 169,569	$ 144,449
Financing Receivable, Nonaccrual, Interest Income	2,000	491	$ 574
Loans and Finance Receivables [Member]
Loans Information [Line Items]
Interest receivable	$ 132,000	$ 113,000

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 8,811	$ 8,811	$ 8,844
Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year		88,109	88,109	$ 88,109
Accumulated amortization	(47,638)	(38,827)	(30,016)
Total estimated amortization expense and MSRs decay(a)	40,471	49,282	58,093
Amortization of other intangible assets	8,811	8,811	8,811
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year		0	0	$ 2,000
Accumulated amortization	0	0	(683)
Total estimated amortization expense and MSRs decay(a)	0	0	0
Amortization of other intangible assets	0	0	33
Other Intangible Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Summary of core deposit intangibles and other intangibles
Reductions due to sale	$ 0	$ 0	$ (1,317)

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2022	Dec. 31, 2020
Mortgage servicing rights:
Servicing Asset at Amortized Cost				$ 54,862		$ 59,967
Cumulative effect of accounting methodology change					$ 2,296
Servicing Asset at Fair Value, Amount	$ 84,390	$ 84,390	$ 77,351	57,158
Servicing Asset at Fair Value, Additions		3,564	7,279	16,151
Servicing Asset at Fair Value, Disposals		(7,185)	(9,350)
Additions				16,151
Amortization				(19,436)
Servicing Asset at Amortized Cost, Before Valuation Adjustments				56,682
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of year			(1,820)	(18,006)
(Additions) recoveries, net				16,186
Valuation allowance at end of year				(1,820)
Fair value of mortgage servicing rights				57,259
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,364,492	$ 7,364,492	$ 6,711,820	$ 6,994,834
Mortgage servicing rights, net to servicing portfolio	1.15%	1.15%	1.15%	0.78%
Mortgage servicing rights expense (a)				$ 3,250
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions		$ 8,881	$ 5,715
Servicing Asset at Fair Value, Other Changes in Fair Value		1,778	16,549
Loans transferred into held for sale from portfolio, net		$ 1,058,305	$ 18	$ 6,010
Residential mortgage
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Loans transferred into held for sale from portfolio, net	$ 969,000
Proceeds from Sale, Loan, Held-for-Sale	$ 844,000

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Core Deposits [Member]
Estimated future amortization expense
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 8,811
Finite-Lived Intangible Assets, Amortization Expense, Year Two	8,811
Finite-Lived Intangible Assets, Amortization Expense, Year Three	8,811
Finite-Lived Intangible Assets, Amortization Expense, Year Four	8,811
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,485
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	1,742
Total estimated amortization expense and MSRs decay(a)	40,471	$ 49,282	$ 58,093
Servicing Contracts [Member]
Estimated future amortization expense
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	10,555
Finite-Lived Intangible Assets, Amortization Expense, Year Two	11,404
Finite-Lived Intangible Assets, Amortization Expense, Year Three	10,710
Finite-Lived Intangible Assets, Amortization Expense, Year Four	9,922
Finite-Lived Intangible Assets, Amortization Expense, Year Five	9,005
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	32,794
Total estimated amortization expense and MSRs decay(a)	$ 84,390

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Details) (Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill, Impaired, Facts and Circumstances Leading to Impairment	no
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Goodwill	$ 1,104,992	$ 1,104,992	$ 1,104,992

Premises and Equipment, Summary

Premises and Equipment, Summary Composition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Cost	$ 749,981
Accumulated Depreciation	377,003
Net Book Value	372,978	$ 376,906
Depreciation and amortization	46,989	45,088	$ 46,508
Land
Property, Plant and Equipment [Line Items]
Cost	63,984
Accumulated Depreciation	0
Net Book Value	63,984	65,516
Land improvements
Property, Plant and Equipment [Line Items]
Cost	21,659
Accumulated Depreciation	10,409
Net Book Value	11,250	10,074
Buildings and improvements
Property, Plant and Equipment [Line Items]
Cost	399,575
Accumulated Depreciation	187,572
Net Book Value	212,004	213,496
Computers and related equipment
Property, Plant and Equipment [Line Items]
Cost	57,265
Accumulated Depreciation	46,420
Net Book Value	10,845	12,606
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Cost	124,108
Accumulated Depreciation	88,481
Net Book Value	35,627	33,110
Operating leases
Property, Plant and Equipment [Line Items]
Cost	43,782
Accumulated Depreciation	19,070
Net Book Value	24,712	25,617
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	39,607
Accumulated Depreciation	25,051
Net Book Value	$ 14,556	$ 16,487

Property, Plant, and Equipment

Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 46,989	$ 45,088	$ 46,508
Land Improvement, Building, Leasehold Improvements, ATM, Computers, Furniture, Fixtures, and Auto [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 30,000	$ 31,000	$ 33,000

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Cost	$ 6,281	$ 6,812	$ 8,712
Finance Lease, Cost	92	119	107
Operating Lease, Payments	7,171	8,440	11,183
Finance Lease, Payments	$ 92	$ 125	$ 137

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Present value of lease payments	$ 27,311
Finance Lease, Liability	383	$ 469
Assets
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	24,712	25,617
Other Assets [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Right-of-Use Asset	368	455
Accrued Liabilities
Lessee, Lease, Description [Line Items]
Present value of lease payments	27,311	28,357
Long-Term Debt [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Liability	$ 383	$ 469

Leases Operating Lease Informat

Leases Operating Lease Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 30,187	$ 30,906
Operating Lease, Weighted Average Remaining Lease Term	5 years 10 months 17 days	6 years 2 months 1 day
Operating Lease, Weighted Average Discount Rate, Percent	3.19%	2.70%
Finance Lease, Liability, Payment, Due	$ 394	$ 485
Finance Lease, Weighted Average Remaining Lease Term	4 years 3 months	5 years 3 months
Finance Lease, Weighted Average Discount Rate, Percent	1.32%	1.32%
Retail and Corporate Offices [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 25,729	$ 26,140
Operating Lease, Weighted Average Remaining Lease Term	5 years 9 months 3 days	5 years 11 months 1 day
Operating Lease, Weighted Average Discount Rate, Percent	3.12%	2.62%
Finance Lease, Liability, Payment, Due	$ 394	$ 485
Finance Lease, Weighted Average Remaining Lease Term	4 years 3 months	5 years 3 months
Finance Lease, Weighted Average Discount Rate, Percent	1.32%	1.32%
Land
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 4,050	$ 4,766
Operating Lease, Weighted Average Remaining Lease Term	6 years 11 months 23 days	7 years 7 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent	3.48%	3.14%
Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 408	$ 0
Operating Lease, Weighted Average Remaining Lease Term	2 years 6 months	0 years
Operating Lease, Weighted Average Discount Rate, Percent	4.62%	0%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Operating Leases
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 6,459
2025	5,628
2026	5,043
2027	4,373
2028	3,428
Beyond 2028	5,257
Total lease payments	30,187	$ 30,906
Less: interest	2,877
Present value of lease payments	27,311
Finance Leases
Finance Lease, Liability, Payments, Due Next Twelve Months	93
2025	93
2026	93
2027	93
2028	23
Beyond 2028	0
Total lease payments	394	485
Less: interest	11
Present value of lease payments	383	$ 469
Total Leases [Line Items]
Twelve months ending December 31, 2024	6,552
2025	5,721
2026	5,135
2027	4,465
2028	3,451
Beyond 2028	5,257
Lease, Liability, Payments, Due, Total	30,581
Less: interest	2,887
Present value of lease payments	$ 27,694

Leases, Minimum Annual Rent Und

Leases, Minimum Annual Rent Under Operating Lease Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Payments
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 6,459
2025	5,628
2026	5,043
2027	4,373
2028	3,428
Beyond 2028	5,257
Lessee, Operating Lease, Liability, Payments, Due	30,187	$ 30,906
Receipts
Lessor, Operating Lease, Payment to be Received, Year One	3,522
Lessor, Operating Lease, Payment to be Received, Year Two	3,854
Lessor, Operating Lease, Payment to be Received, Year Three	3,539
Lessor, Operating Lease, Payment to be Received, Year Four	3,146
Lessor, Operating Lease, Payment to be Received, Year Five	2,338
Lessor, Operating Lease, Payment to be Received, after Year Five	12,446
Lessor, Operating Lease, Payments to be Received	28,843
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, to be Paid, Year One	6,459
2025	5,628
2026	5,043
2027	4,373
2028	3,428
Beyond 2028	5,257
Lessee, Operating Lease, Liability, Payments, Due	30,187	$ 30,906
Rental Payments
Payments
Lessee, Operating Lease, Liability, to be Paid, Year One	6,352
2025	5,436
2026	5,117
2027	4,447
2028	3,448
Beyond 2028	5,447
Lessee, Operating Lease, Liability, Payments, Due	30,247
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, to be Paid, Year One	6,352
2025	5,436
2026	5,117
2027	4,447
2028	3,448
Beyond 2028	5,447
Lessee, Operating Lease, Liability, Payments, Due	$ 30,247

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Liability	$ 3	$ 13
Operating Leases, Rent Expense, Net of Lease Income	$ 2	$ 3	$ 5
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	39 years
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	7 years

Deposits, Composition (Details)

Deposits, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Feb. 26, 2021
Deposits, by Type [Abstract]
Noninterest-bearing demand deposits	$ 6,119,956	$ 7,760,811
Savings	4,835,701	4,604,848
Interest-bearing demand	8,843,967	7,100,727
Money market	6,330,453	8,239,610
Brokered CDs	4,447,479	541,916
Other time deposits	2,868,494	1,388,242
Total deposits	$ 33,446,049	$ 29,636,154	$ 31,000

Deposits, Time Deposit Maturiti

Deposits, Time Deposit Maturities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
2024	$ 7,100,729
2025	175,549
2026	20,680
2027	11,694
2028	7,315
Thereafter	5
Total	$ 7,315,973

Deposits (Details)

Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deposits [Abstract]
Time Deposits, $250,000 Or More	$ 523	$ 282

Short and Long-term Funding, Co

Short and Long-term Funding, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Short-Term Debt [Abstract]
Federal Funds Purchased	$ 220,160	$ 344,170
Securities Sold under Agreements to Repurchase	106,620	240,969
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	326,780	585,139
Commercial Paper	0	20,798
Short-Term Debt, Total	326,780	605,937
Debt Instrument [Line Items]
Subordinated Debt	550,000	250,000
Other Long-term Debt and Capitalized Costs	(7,748)	(544)
Finance Lease, Liability	383	469
Other Long-term Debt	541,269	248,071
TotalShortTermLongTermExcludingFHLB	868,049	854,007
Advance from Federal Home Loan Bank	740,000	3,125,000
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	740,000	3,125,000
Long-Term Federal Home Loan Bank Advances	1,209,907	1,209,170
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,940,194	4,319,861
Debt, Long-Term and Short-Term, Combined Amount, Total	2,808,243	5,173,869
Fair Value Hedging
Debt Instrument [Line Items]
Subordinated Debt	(1,366)	(1,855)
Advance from Federal Home Loan Bank	(9,713)	(14,308)
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	$ (9,713)	$ (14,308)

Short and Long-term Funding Rem

Short and Long-term Funding Remaining Contractual Maturity of Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Maturity Overnight and on Demand [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement	$ 106,620	$ 240,969

Short and Long-term Funding Lon

Short and Long-term Funding Long-term Funding, Maturities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Disclosure [Line Items]
Long-term Debt	$ 1,741,463
Long Term Funding Maturity within One Year [Domain]
Debt Disclosure [Line Items]
Long-term Debt	248,884
Long Term Funding Maturity One Year to Two Years [Domain]
Debt Disclosure [Line Items]
Long-term Debt	394,797
Long Term Funding Maturity Two Years to Three Years [Domain]
Debt Disclosure [Line Items]
Long-term Debt	604,540
Long Term Funding Maturity Year Three to Year Four [Domain]
Debt Disclosure [Line Items]
Long-term Debt	671
Long Term Funding Maturity Year Four to Year Five [Domain]
Debt Disclosure [Line Items]
Long-term Debt	198,966
Long Term Funding Maturity After Year Five [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 293,605

Short and Long-term Funding Sho

Short and Long-term Funding Short and Long-term Funding (Details Textuals) - USD ($) $ in Millions				3 Months Ended
	Feb. 10, 2023	Feb. 06, 2023	Nov. 13, 2014	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt Instrument, Redemption Period, Start Date		Mar. 01, 2028
Fair Value of Pledged Securities to Securities Sold under Agreements to Repurchase					191%
Interest Added to 5 Year UST Rate	2.812%
Weighted Average Coupon Rate					4.93%	4.06%
Prepayment of FHLB Advances				$ 400
Maximum
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged					$ 10,500
Two Thousand Fourteen Subordinated Notes [Member]
Debt Instrument [Line Items]
Junior Subordinated Debentures Issued			$ 250
Debt Instrument, Term			10 years
Debt Instrument, Maturity Date Month, Year			January 2025
Debt Instrument Call Date Earliest Month Year			October 2024
Subordinated Borrowing, Interest Rate			4.25%
Two Thousand Twenty Three Subordinated Notes
Debt Instrument [Line Items]
Junior Subordinated Debentures Issued		$ 300
Debt Instrument, Term		10 years
Debt Instrument, Maturity Date Month, Year		March 1, 2033
Subordinated Borrowing, Interest Rate		6.625%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions

12 Months Ended

Jan. 30, 2024

Jun. 01, 2020

Sep. 19, 2018

Sep. 15, 2016

Jun. 15, 2015

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2018

Dec. 31, 2021

Sep. 15, 2021

Jun. 15, 2021

Jul. 25, 2017

Stockholders' Equity Note [Abstract]

Subsidiary equity balance

$ 4,100

Class of Stock [Line Items]

Preferred Stock, Shares Issued

200,000

200,000

Series C Preferred Stock

Class of Stock [Line Items]

Preferred Stock, Shares Issued

2,600,000

Preferred Stock, Dividend Rate, Percentage

6.125%

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Preferred Stock, Redemption Price Per Share

$ 1,000

Preferred Stock, Redemption Amount

$ 65

Series D Preferred Stock

Class of Stock [Line Items]

Preferred Stock, Shares Issued

4,000,000

Preferred Stock, Dividend Rate, Percentage

5.375%

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Preferred Stock, Redemption Price Per Share

$ 1,000

Stock repurchase program authorized amount

$ 15

Preferred Stock, Redemption Amount

$ 1

$ 99

Purchase of Preferred Stock Repurchased During Period, Shares

22,000

Series E Preferred Stock

Class of Stock [Line Items]

Preferred Stock, Shares Issued

4,000,000

Preferred Stock, Dividend Rate, Percentage

5.875%

5.875%

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Preferred Stock, Redemption Price Per Share

$ 1,000

Preferred Stock, Participation Rights

Dividends on the Series E Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.875%.

Preferred Stock, Dividend Payment Terms

Shares of the Series E Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series E Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment.

Preferred Stock, Redemption Terms

The Series E Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on December 15, 2023, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends.

Preferred Stock, Voting Rights

Except in certain limited circumstances, the Series E Preferred Stock does not have any voting rights.

Series F Preferred Stock [Member]

Class of Stock [Line Items]

Preferred Stock, Shares Issued

4,000,000

Preferred Stock, Dividend Rate, Percentage

5.625%

Preferred Stock, Liquidation Preference Per Share

$ 1,000

Preferred Stock, Redemption Price Per Share

$ 1,000

Preferred Stock, Participation Rights

Dividends on the Series F Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.625%.

Preferred Stock, Dividend Payment Terms

Shares of the Series F Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series F Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment.

Preferred Stock, Redemption Terms

The Series F Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on September 15, 2025, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends.

Preferred Stock, Voting Rights

Except in certain limited circumstances, the Series F Preferred Stock does not have any voting rights.

Treasury Stock

Class of Stock [Line Items]

Stock repurchase program authorized amount

$ 0

$ 100

Purchase of Preferred Stock Repurchased During Period, Shares

0

Common Stock [Member]

Class of Stock [Line Items]

Payments Related to Tax Withholding for Share-based Compensation

$ 7

$ 6

Shares Paid for Tax Withholding for Share Based Compensation

297,564

267,605

Minimum tax withholding settlement average cost per share (in usd per share)

$ 22.16

$ 24.22

Remaining authorized repurchase amount

$ 80

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	3,994
Exercised (in shares)	178
Forfeited or expired (in shares)	24
Stock Options Shares Outstanding, Ending balance (in shares)	3,792	3,994
Options exercisable (in shares)	3,583
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 21.06
Exercised, Weighted Average Exercise Price (in usd per share)	17.26
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	19.54
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	21.25	$ 21.06
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 21.44
Stock Options Outstanding, Weighted Average Remaining Contractual Term	4 years 3 months 3 days	5 years 1 month 9 days
Options exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 24 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 5,834	$ 10,525
Options exercisable, Aggregate Intrinsic Value	$ 5,139

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Beginning balance (in shares) | shares	2,303
Granted (in shares) | shares	880
Vested (in shares) | shares	778
Forfeited (in shares) | shares	55
Outstanding Shares, Ending balance (in shares) | shares	2,349
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	$ 20.81
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	22.10
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	21.02
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	21.90
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 21.20

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised	$ 518,000	$ 4,000,000	$ 9,000,000
Total fair value of vested stock options	$ 943,000	$ 2,000,000	4,000,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150%
Performance-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of transfer restrictions	3 years
Service-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	4 years	4 years
Term of transfer restrictions	4 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	$ 333,000	$ 710,000	1,000,000
Recognized compensation expense for accelerated vesting of stock options	0
Unvested share-based payment awards	$ 32,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter of 2024
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	$ 17,000,000	$ 16,000,000	$ 15,000,000
Recognized compensation expense for accelerated vesting of stock options	3,000,000
Unvested share-based payment awards	$ 20,000,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter of 2027
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years	3 years
2020 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant (in shares)	7.2
Expiration term of awards	10 years
Vesting Period	4 years

Retirement Plans, Pension and P

Retirement Plans, Pension and Postretirement Plans Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Plan Assets As A Percentage Of Net Benefit Obligation	215%	196%
Change in Benefit Obligation
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 0	$ 0	$ 1,494
RAP
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	407,405	497,796
Actual return on plan assets	60,565	(74,140)
Employer contributions	0	0
Gross benefits paid	(14,513)	(16,252)
Fair value of plan assets at end of year(a)	453,457	407,405	497,796
Change in Benefit Obligation
Net benefit obligation at beginning of year	208,315	261,321
Service cost	3,189	3,670	7,779
Interest cost	10,887	7,152	6,570
Actuarial (gain) loss	3,475	(47,577)
Gross benefits paid	(14,513)	(16,252)
Net benefit obligation at end of year(a)	211,353	208,315	261,321
Funded (unfunded) status	242,104	199,089
Noncurrent assets	242,104	199,089
Current liabilities	0	0
Noncurrent liabilities	0	0
Asset (liability) recognized on the consolidated balance sheets	$ 242,104	199,089
Defined Benefit Plan, Description	The Corporation has a noncontributory defined benefit 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.
Postretirement Plan
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	$ 0	0
Actual return on plan assets	0	0
Employer contributions	171	193
Gross benefits paid	(171)	(193)
Fair value of plan assets at end of year(a)	0	0	0
Change in Benefit Obligation
Net benefit obligation at beginning of year	1,530	1,975
Service cost	0	0
Interest cost	78	53	52
Actuarial (gain) loss	(12)	(305)
Gross benefits paid	(171)	(193)
Net benefit obligation at end of year(a)	1,425	1,530	$ 1,975
Funded (unfunded) status	(1,425)	(1,530)
Noncurrent assets	0	0
Current liabilities	(158)	(164)
Noncurrent liabilities	(1,267)	(1,366)
Asset (liability) recognized on the consolidated balance sheets	$ (1,425)	$ (1,530)
Defined Benefit Plan, Description	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.

Retirement Plans, Amounts Recog

Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income Table (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
RAP
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ (884)	$ (1,064)
Net actuarial loss (gain)	27,089	44,919
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss	26,204	43,855
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(308)	(362)
Net actuarial loss (gain)	(301)	(316)
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss	$ (609)	$ (678)

Retirement Plans, Other Changes

Retirement Plans, Other Changes in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ (326)	$ (325)	$ (148)
Amortization of actuarial loss (gain)	24,091	(51,745)	25,519
Income tax benefit (expense)	(6,304)	13,495	(7,803)
Other comprehensive income (loss) on defined benefit pension and postretirement obligations	17,432	(37,917)	$ 23,656
RAP
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	24,228	(53,466)
Amortization of prior service cost	(250)	(250)
Amortization of actuarial loss (gain)	0	658
Income tax benefit (expense)	(6,327)	13,553
Other comprehensive income (loss) on defined benefit pension and postretirement obligations	17,650	(39,504)
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	12	305
Amortization of prior service cost	(75)	(75)
Amortization of actuarial loss (gain)	(29)	0
Income tax benefit (expense)	23	(58)
Other comprehensive income (loss) on defined benefit pension and postretirement obligations	$ (68)	$ 171

Retirement Plans, Components of

Retirement Plans, Components of Net Pension Cost for the Retirement Account Plan Tables (Details) - RAP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net period benefit cost for the pension and postretirement plans
Service cost	$ 3,189	$ 3,670	$ 7,779
Interest cost	10,887	7,152	6,570
Expected return on plan assets	(32,862)	(26,903)	(25,675)
Amortization of prior service cost	(250)	(250)	(73)
Amortization of actuarial loss	0	658	4,594
Recognized settlement loss	0	0	434
Total net periodic pension (income)	$ (19,037)	$ (15,673)	$ (6,370)

Retirement Plans Retirement Pla

Retirement Plans Retirement Plans, Components of Net Pension Cost for the Post Retirement Plan Table (Details) - Postretirement Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost	$ 78	$ 53	$ 52
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(75)	(75)	(75)
Defined Benefit Plan, Amortization of Gain (Loss)	(29)	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (26)	$ (22)	$ (24)

Retirement Plans, Weighted Aver

Retirement Plans, Weighted Average Assumptions used to Determine Benefit and Net Periodic Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
RAP
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.40%	5.40%
Rate of increase in compensation levels	2.50%	2.50%
Interest crediting rate	3.77%	3.46%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.40%	2.80%
Rate of increase in compensation levels	2.50%	2.50%
Expected long-term rate of return on plan assets	7.30%	6%
Postretirement Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	5.40%	5.40%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.40%	2.80%

Retirement Plans, Asset Allocat

Retirement Plans, Asset Allocation for Pension Plan Table (Details) - RAP	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Total	100%	100%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	54%	53%
Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total	34%	35%
Group annuity contracts
Defined Benefit Plan Disclosure [Line Items]
Total	10%	10%
Other
Defined Benefit Plan Disclosure [Line Items]
Total	2%	2%

Retirement Plans, Fair Value of

Retirement Plans, Fair Value of Pension Plan Investments Table (Details) - RAP - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan Investments
RAP Investment Amount	$ 453,457	$ 407,405	$ 497,796
Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	409,771	366,466
Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	43,687	40,939
Money market account
Pension Plan Investments
RAP Investment Amount	10,040	6,628
Money market account | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	10,040	6,628
Money market account | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Money market account | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Defined Benefit Plan, Common Collective Trust
Pension Plan Investments
RAP Investment Amount	164,891	155,654
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	164,891	155,654
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Mutual funds
Pension Plan Investments
RAP Investment Amount	234,840	204,184
Mutual funds | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	234,840	204,184
Mutual funds | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Mutual funds | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts
Pension Plan Investments
RAP Investment Amount	43,687	40,939
Group annuity contracts | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	$ 43,687	$ 40,939

Retirement Plans Retirement P_2

Retirement Plans Retirement Plans, Fair Value Reconciliation of Level 3 Retirement Account Plan Investments (Details) - RAP - Group annuity contracts - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of group annuity contract at beginning of period	$ 40,939	$ 49,213
Return on plan assets	5,313	(5,671)
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlement	(2,565)	(2,604)
Fair value of group annuity contract at end of period	$ 43,687	$ 40,939

Retirement Plans, Estimated Fut

Retirement Plans, Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
RAP
Defined Benefit Plan Disclosure [Line Items]
2024	$ 20,198
2025	22,320
2026	21,163
2027	19,804
2028	19,842
2029-2033	83,328
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
2024	163
2025	158
2026	152
2027	146
2028	140
2029-2033	$ 595

Retirement Plans (Details)

Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RAP
Retirements Plans [Line Items]
Defined Benefit Plan, Description	The Corporation has a noncontributory defined benefit 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.
Actual return on plan assets percentage	15.80%	(15.03%)
Employer contributions	$ 0	$ 0
Interest crediting rate	3.77%	3.46%
Postretirement Plan
Retirements Plans [Line Items]
Defined Benefit Plan, Description	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.
Employer contributions	$ 171	$ 193
Defined Benefit Plan, Health Care Cost Trend, Reduction in Trend Rate Minimum	4%
Ultimate future rate	5%
401(k) plan
Retirements Plans [Line Items]
Total expense related to 401(k)	$ 16,000	$ 15,000	$ 13,000
Minimum [Member] | RAP | Equity securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50%
Minimum [Member] | RAP | Fixed-income securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30%
Minimum [Member] | RAP | Other Cash Equivalents
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Minimum [Member] | RAP | Alternative securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Maximum [Member] | RAP | Equity securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	70%
Maximum [Member] | RAP | Fixed-income securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50%
Maximum [Member] | RAP | Other Cash Equivalents
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%
Maximum [Member] | RAP | Alternative securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15%

Income Taxes, Current and Defer

Income Taxes, Current and Deferred Amounts of Income Tax Expense Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 29,319	$ 58,982	$ 57,916
State	5,283	22,092	12,035
Total current	34,602	81,074	69,951
Deferred:
Federal	(8,371)	12,531	9,115
State	(3,135)	(97)	6,247
Total deferred	(11,506)	12,434	15,362
Total income tax expense	$ 23,097	$ 93,508	$ 85,313

Income Taxes, Deferred Tax Asse

Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Gross deferred tax assets:
Allowance for loan losses	$ 83,378	$ 79,142
Allowance for other losses	8,933	10,558
Accrued liabilities	14,089	2,842
Deferred compensation	28,429	30,246
Tax Credit Carryforward, Amount	8,849	0
Benefit of state tax losses and credit carryforwards	9,068	7,476
Nonaccrual interest	901	891
Deferred Tax Assets, Partnerships	2,365	0
Lease liability	6,785	7,390
Net unrealized losses on AFS securities	48,632	80,148
Net unrealized losses on pension and postretirement benefits	8,506	14,803
Other	9,403	4,545
Total deferred tax assets	229,338	238,041
Gross deferred tax liabilities
Prepaid expenses	66,381	64,480
Goodwill	22,161	23,119
Mortgage banking activities	20,799	20,145
Deferred loan fee income	8,097	4,269
State deferred taxes	1,387	1,389
Lease financing	15,297	3,145
Bank premises and equipment	20,389	20,860
Purchase accounting	7,898	10,381
Deferred Tax Liability, Basis Difference From Equity Securities and Other Investments	7,593	5,582
Other	1,207	821
Total deferred tax liabilities	171,209	154,191
Net deferred tax assets	$ 58,129	$ 83,850

Income Taxes, Major Reasons for

Income Taxes, Major Reasons for the Difference in Effective Income Tax Rate from the Federal Tax Rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation
Federal income tax rate at statutory rate	21%	21%	21%
Increases (decreases) resulting from:
Tax-exempt interest and dividends	(7.40%)	(3.40%)	(3.00%)
State income taxes (net of federal benefit)	0.30%	4.20%	3.80%
Bank owned life insurance	(1.10%)	(0.50%)	(0.60%)
Tax effect of tax credits and benefits, net of related expenses	(4.70%)	(1.60%)	(1.80%)
Net tax (benefit) from stock-based compensation	0%	(0.20%)	0%
Restructuring in conjunction with ABRC sale	0%	0%	(0.10%)
FDIC premium	3%	0.70%	0.50%
Other	0.10%	0.10%	(0.20%)
Effective income tax rate	11.20%	20.30%	19.60%

Income Taxes, Reconciliation of

Income Taxes, Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 2,233	$ 2,324
Subtractions for tax positions related to prior years	(441)	(486)
Additions for tax positions related to current year	435	395
Balance at end of year	$ 2,227	$ 2,233

Income Taxes, Textuals (Details

Income Taxes, Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards [Line Items]
Bad debt from acquired savings banks	$ 100
Deferred tax on bad debt from acquired savings banks	25
Income Tax Examination, Penalties and Interest Expense	0	$ 0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	126
Operating tax loss carryforwards from acquisitions	$ 2
Operating Loss Carryforwards, Expiration Begin Date	begin expiring in 2024

Derivative and Hedging Activi_2

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Assets [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	$ 123,723	$ 67,690
Less: Legally enforceable master netting agreements	18,234	2,788
Less: Cash collateral pledged/received	35,855	26,898
Net Amounts Presented on the Consolidated Balance Sheets	69,634	38,003
Liability
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other liabilities), fair value	202,958	254,079
Less: Legally enforceable master netting Liability	18,234	2,788
Less: Cash collateral pledged/received	0	217
Derivative Liability	184,724	251,073
Not designated as hedging instruments: | Interest Rate Related Instruments Customer and Mirror | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	111,623	62,401
Derivatives (trading and other liabilities), fair value	195,662	251,398
Not designated as hedging instruments: | Foreign currency exchange forwards | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	2,954	437
Derivatives (trading and other liabilities), fair value	2,746	402
Not designated as hedging instruments: | Mortgage banking(a) | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	439	86
Derivatives (trading and other liabilities), fair value	673	46
Not designated as hedging instruments: | Other Assets [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	115,016	62,925
Not designated as hedging instruments: | Other Assets [Member] | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	3,603,513	4,246,823
Not designated as hedging instruments: | Other Assets [Member] | Foreign currency exchange forwards
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	87,526	68,570
Not designated as hedging instruments: | Other Assets [Member] | Mortgage banking(a)
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	29,490	21,265
Not designated as hedging instruments: | Liability
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other liabilities), fair value	199,082	251,847
Not designated as hedging instruments: | Liability | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	6,528,471	4,599,391
Not designated as hedging instruments: | Liability | Foreign currency exchange forwards
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	135,654	34,240
Not designated as hedging instruments: | Liability | Mortgage banking(a)
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	51,500	33,000
Designated as Hedging Instrument [Member] | Interest Rate Related Instruments Customer and Mirror | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	8,075	4,349
Derivatives (trading and other liabilities), fair value	930	1,260
Designated as Hedging Instrument [Member] | Foreign currency exchange forwards | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	632	416
Derivatives (trading and other liabilities), fair value	2,946	972
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	8,707	4,765
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	2,300,000	900,000
Designated as Hedging Instrument [Member] | Other Assets [Member] | Foreign currency exchange forwards
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	231,566	261,595
Designated as Hedging Instrument [Member] | Liability
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other liabilities), fair value	3,876	2,233
Designated as Hedging Instrument [Member] | Liability | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	550,000	1,150,000
Designated as Hedging Instrument [Member] | Liability | Foreign currency exchange forwards
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	$ 189,212	$ 167,088

Derivative and Hedging Activi_3

Derivative and Hedging Activities Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Recording of Fair Value Hedge [Line Items]
Carrying amount excluded for foreign currency loans	$ 421,000	$ 429,000
Derivative Financial Instruments, Liabilities [Member]
Balance Sheet Recording of Fair Value Hedge [Line Items]
Derivative Liability	(1,138,921)	(833,837)
Fair Value Hedging
Balance Sheet Recording of Fair Value Hedge [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	11,079	16,163
Long-Term Debt [Member] | Derivative Financial Instruments, Liabilities [Member]
Balance Sheet Recording of Fair Value Hedge [Line Items]
Derivative Liability	(548,634)	(248,145)
Long-Term Debt [Member] | Fair Value Hedging
Balance Sheet Recording of Fair Value Hedge [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	1,366	1,855
Federal Home Loan Bank Advances | Derivative Financial Instruments, Liabilities [Member]
Balance Sheet Recording of Fair Value Hedge [Line Items]
Derivative Liability	(590,287)	(585,692)
Federal Home Loan Bank Advances | Fair Value Hedging
Balance Sheet Recording of Fair Value Hedge [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 9,713	$ 14,308

Derivative and Hedging Activi_4

Derivative and Hedging Activities Income Impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (14,176)	$ (263)	$ (1,376)
Interest Income [Member] | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(245)	(529)	(1,376)
Interest Income [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(13,930)	266	0
Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	17,536	334
Other Operating Income (Expense) [Member] | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	5,084	(16,163)
Other Operating Income (Expense) [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	12,451	16,497
Capital market fees, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	(9)	55
Capital market fees, net | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	9,322	(26,686)	1,012
Capital market fees, net | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(9,322)	$ 26,677	$ (957)
Loss on Mortgage Sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(125)
Loss on Mortgage Sale | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(125)
Loss on Mortgage Sale | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities, Cash Flow Hedge Impact on AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flow Hedge Impacts on AOCI [Line Items]
Fair value adjustment on cash flow hedges	$ (13,254)	$ 3,626	$ 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 13,930	$ (266)	$ 0

Derivative and Hedging Activi_5

Derivative and Hedging Activities, Income Statement Category of the Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Capital market fees, net | Interest Rate Related Instruments Customer and Mirror
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ 392	$ 515	$ 2,432
Capital market fees, net | Foreign currency exchange forwards
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	1,670	203	730
Capital market fees, net | Commodity contracts
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	0	(16)	(1,316)
Mortgage banking, net | Interest Rate Related Instruments Customer and Mirror
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	(1,096)	(12,622)	0
Mortgage banking, net | Mortgage banking(a)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	353	(2,531)	(7,007)
Mortgage banking, net | Forward commitments (mortgage)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ (627)	$ (123)	$ 2,075

Derivative and Hedging Activi_6

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Underlying Hedged Asset, Amortized Cost Basis	$ 267,000
Additional Collateral, Aggregate Fair Value	93,000	$ 92,000
Derivative collateral right to reclaim cash	5,000	$ 3,000
Derivative Liability Notional Amount, Terminated			$ 500,000
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months	$ 7,000
Maximum Length of Time Hedged in Cash Flow Hedge	35 months
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 1,000
Fair Value, Inputs, Level 2 | Commodity contracts | Fair Value, Measurements, Recurring [Member] | Not designated as hedging instruments:
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Amounts Presented on the Consolidated Balance Sheets	$ 0

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Offsetting Derivative Assets [Abstract]
Gross Amounts Recognized	$ 87,075	$ 63,029
Derivative Liabilities Offset	(18,234)	(2,788)
Cash Collateral Received	(35,855)	(26,898)
Net Amounts Presented on the Consolidated Balance Sheets	32,985	33,342
Gross Amounts Not Offset on the Consolidated Balance Sheets	(32,985)	(30,753)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	2,589
Offsetting Derivative Liabilities [Abstract]
Gross Amounts Recognized	18,767	3,096
Derivative Assets Offset	(18,234)	(2,788)
Cash Collateral Pledged	0	(217)
Derivative Liability	533	91
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 533	$ 91

Commitments, Off-Balance Shee_3

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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)
Schedule of lending-related and other commitments [Line Items]
Lending related commitments	11,170,147	12,444,275
Commercial letters of credit(a)
Schedule of lending-related and other commitments [Line Items]
Lending related commitments	3,697	3,188
Standby letters of credit(c)
Schedule of lending-related and other commitments [Line Items]
Lending related commitments	212,029	270,692
Standby letters of credit, fair value	$ 2,000	$ 3,000

Commitments, Changes in the All

Commitments, Changes in the Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss
Balance at beginning of period	$ 38,776	$ 39,776
Provision for unfunded commitments	(4,000)	(1,000)
Balance at end of period	$ 34,776	$ 38,776

Commitments, Off-Balance Shee_4

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 34,000	$ 34,000	$ 33,000
Remaining Investment in Qualified Affordable Housing Projects	215,000	246,000
Unfunded Equity Contributions Obligation Amount	27,000	40,000
Affordable Housing Project Investment, Write-down, Amount	0	0	$ 0
Loans repurchased under make whole requests	5,000	6,000
Loans sold to outside investors original amount	3,800,000
Loans sold to outside investors remaining outstanding amount	3,500,000
Mortgage Repurchase Reserve	835	1,000
Residential mortgage loans sold with recourse risk	15,000	7,000
Residential mortgage loans sold with credit recourse risk	16,000	19,000
Residential Mortgage Loans with Credit Risk Recourse, Historical Losses	0	0
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	219,000	250,000
PrincipalInvestmentCommitment
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	$ 40,000	$ 27,000

Parent Company Only Financial_3

Parent Company Only Financial Information, Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and Due from Banks	$ 484,384	$ 436,952
Interest-bearing deposits in other financial institutions	425,089	156,693
Other assets	658,604	547,621
Total assets	41,015,855	39,405,727
Liabilities and stockholders' equity
Commercial Paper	0	20,798
Subordinated notes, at par	550,000	250,000
Long-term funding capitalized costs and fair value hedge liability	7,748	544
Total long-term funding	1,741,463
Other Liabilities	552,814	541,438
Total liabilities	36,841,882	35,390,237
Preferred equity	194,112	194,112
Common equity	1,752	1,752
Total stockholders’ equity	4,173,973	4,015,490	$ 4,024,853	$ 4,090,933
Total liabilities and stockholders’ equity	41,015,855	39,405,727
Parent Company Only
Assets
Cash and Due from Banks	22,473	14,899
Interest-bearing deposits in other financial institutions	20,428	29,856
Notes and interest receivable from subsidiaries	562,640	172,066
Investments in and receivable due from subsidiaries	4,080,536	4,036,273
Other assets	48,589	48,097
Total assets	4,734,666	4,301,191
Liabilities and stockholders' equity
Commercial Paper	0	20,798
Subordinated notes, at par	550,000	250,000
Long-term funding capitalized costs and fair value hedge liability	(9,114)	(2,399)
Total long-term funding	540,886	247,601
Other Liabilities	19,807	17,301
Total liabilities	560,693	285,701
Preferred equity	194,112	194,112
Common equity	3,979,861	3,821,378
Total stockholders’ equity	4,173,973	4,015,490
Total liabilities and stockholders’ equity	$ 4,734,666	$ 4,301,191

Parent Company Only Financial_4

Parent Company Only Financial Information, Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income
Interest income on notes receivable from subsidiaries	$ 1,720,406	$ 992,642	$ 693,729
Total revenue	1,102,756	1,239,691	1,058,219
Expense
Income before income tax expense	206,052	459,630	436,307
Income tax expense	23,097	93,508	85,313
Net income	182,956	366,122	350,994
Preferred stock dividends	11,500	11,500	17,111
Net income available to common equity	171,456	354,622	333,883
Parent Company Only
Income
Income from subsidiaries	192,559	373,581	361,198
Interest income on notes receivable from subsidiaries	30,363	5,632	3,247
Other income	1,175	1,262	682
Total revenue	224,097	380,475	365,127
Expense
Interest expense on short and long-term funding	36,081	10,655	10,942
Other expense	7,352	6,118	7,330
Total expense	43,434	16,772	18,272
Income before income tax expense	180,663	363,702	346,856
Income tax expense	(2,292)	(2,420)	(4,138)
Net income	182,956	366,122	350,994
Preferred stock dividends	11,500	11,500	17,111
Net income available to common equity	$ 171,456	$ 354,622	$ 333,883

Parent Company Only Financial_5

Parent Company Only Financial Information, Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net income	$ 182,956	$ 366,122	$ 350,994
Adjustments to reconcile net income to net cash provided by operating activities:
Net change in other assets and other liabilities	(14,556)	(6,539)	66,201
Net cash provided by operating activities	442,740	846,566	529,551
Cash flows from investing activities
Net cash (used in) investing activities	(1,436,257)	(5,254,811)	(1,584,186)
Cash flows from financing activities
Proceeds from (Repayments of) Short-Term Debt	(279,157)	251,674	101,946
Redemption of Corporation's senior notes	0	0	300,000
Proceeds from issuance of common stock for stock-based compensation plans	4,297	11,061	25,702
Purchase of treasury stock, open market purchases	0	(938)	0
Cash dividends on common stock	(129,534)	(123,137)	(116,061)
Cash dividends on preferred stock	(11,500)	(11,500)	(17,111)
Other		(938)
Net cash used in financing activities	1,295,885	4,004,185	1,364,102
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	302,368	(404,060)	309,467
Treasury Stock
Cash flows from financing activities
Other	0	(938)	0
Performance/Service Based RSAs, RSA, [Member]
Cash flows from financing activities
Payments for Repurchase of Common Stock	(6,593)	(6,480)	(4,847)
Parent Company Only
Cash Flows from Operating Activities
Net income	182,956	366,122	350,994
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease in equity in undistributed net income (loss) of subsidiaries	107,441	(343,582)	28,802
Net change in other assets and other liabilities	(35,863)	14,159	17,102
Net cash provided by operating activities	254,534	36,699	396,898
Cash flows from investing activities
Net (increase) decrease in notes receivable from subsidiaries	(385,000)	115,000	20,000
Net cash (used in) investing activities	(385,000)	115,000	20,000
Cash flows from financing activities
Proceeds from (Repayments of) Short-Term Debt	(20,798)	(13,932)	(24,616)
Proceeds from issuance of long-term funding	292,740	0	0
Proceeds from issuance of common stock for stock-based compensation plans	4,297	11,061	25,702
Redemption of preferred stock	0	0	(164,458)
Purchase of treasury stock, open market purchases	0	0	(132,955)
Cash dividends on common stock	(129,534)	(123,137)	(116,061)
Cash dividends on preferred stock	(11,500)	(11,500)	(17,111)
Net cash used in financing activities	128,612	(144,928)	(434,346)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(1,854)	6,771	(17,448)
Cash and cash equivalents at end of year	42,901	44,755	37,984
Cash and cash equivalents at beginning of year	$ 44,755	$ 37,984	$ 55,432

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 3,600,892	$ 2,742,025
Equity Securities with Readily Determined Fair Value	7,000	6,000
Servicing Asset at Fair Value, Amount	84,390	77,351	$ 57,158
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	35,902	109,378
Equity Securities with Readily Determined Fair Value	6,883	5,991
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,564,990	2,632,647
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Servicing Asset at Fair Value, Amount	84,390	77,351
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Interest Rate Fair Value Hedge Asset at Fair Value	8,075	4,349
Foreign Currency Contract, Asset, Fair Value Disclosure	632	416
Liabilities, Fair Value Disclosure [Abstract]
Interest Rate Fair Value Hedge Liability at Fair Value	930	1,260
Foreign Currency Contracts, Liability, Fair Value Disclosure	2,946	972
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	35,902	109,378
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	35,902	109,378
Agency Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		13,532
Agency Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	13,532
US States and Political Subdivisions Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	91,817	230,714
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	91,817	230,714
Residential Related Securities | FNMA/FHLMC [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,120,794	1,604,610
Residential Related Securities | Government National Mortgage Association (GNMA)
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,042,675	497,596
Residential Related Securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FNMA/FHLMC [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,120,794	1,604,610
Residential Related Securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Government National Mortgage Association (GNMA)
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,042,675	497,596
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0
Commercial Mortgage-Backed Securities [Member] | FNMA/FHLMC [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	16,937	17,142
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA)
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	154,793	110,462
Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FNMA/FHLMC [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	16,937	17,142
Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Government National Mortgage Association (GNMA)
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	154,793	110,462
FFELP asset backed securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	133,975	151,191
FFELP asset backed securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	133,975	151,191
US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,051	4,477
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,051	4,477
Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,950	2,922
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,950	2,922
Total AFS investment securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	35,902	109,378
Total AFS investment securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,564,990	2,632,647
Other Debt And Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Equity Securities with Readily Determined Fair Value	6,883	5,991
Residential loans held for sale | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	33,011	20,383
Interest rate-related and other instruments not designated as hedging instruments(a) | Not designated as hedging instruments: | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	111,623	62,401
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	195,662	251,398
Foreign currency exchange forwards not designated as hedging instruments(a) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	2,746	402
Foreign currency exchange forwards not designated as hedging instruments(a) | Not designated as hedging instruments: | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,954	437
Commodity contracts(a) | Not designated as hedging instruments: | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0
Interest rate lock commitments to originate residential mortgage loans held for sale | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	439	86
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	673	46
Interest rate lock commitments to originate residential mortgage loans held for sale | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	439	86
Forward commitments to sell residential mortgage loans | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	$ 673	$ 46

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Financial Instruments, Assets [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ 86	$ 2,617
New production	6,557	10,442
Closed loans / settlements	(4,171)	(913)
Other	(2,033)	(12,060)
Change in mortgage derivative	352	(2,531)
Ending Balance	439	86
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	46	(30)
New production	(1,816)	(2,028)
Closed loans / settlements	2,494	24,766
Other	(51)	(22,662)
Change in mortgage derivative	627	76
Ending Balance	673	46
Total derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	40	2,647
New production	8,373	12,470
Closed loans / settlements	(6,665)	(25,679)
Other	(1,982)	10,603
Change in mortgage derivative	(274)	(2,607)
Ending Balance	$ (234)	$ 40

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2022	$ 19,000
Write-up of equity securities without readily determinable fair values	5,785	$ 5,690	$ 0
Equity Securities without Readily Determinable Fair Value, Additions, Annual Amount	10,011
Equity Securities without Readily Determinable Fair Value, Sales, Annual Amount	(252)
Equity Securities without Readily Determinable Fair Value, Amount	35,000	19,000
Fair Value, Inputs, Level 3
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2022	19,225
Write-up of equity securities without readily determinable fair values	5,785
Equity Securities without Readily Determinable Fair Value, Amount	24,769	$ 19,225
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount	24,671
Cumulative downward carrying value changes between January 1, 2018 and December 31, 2023	0
Fair Value, Inputs, Level 3 and NAV
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Equity Securities without Readily Determinable Fair Value, Amount	$ 34,769

Fair Value Measurements, Asse_3

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity Securities without Readily Determinable Fair Value, Amount	$ 35,000	$ 19,000
Write-up of equity securities without readily determinable fair values	5,785	5,690	$ 0
Equity securities	41,651	25,216
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans Receivable, Fair Value Disclosure	27,371,086	27,481,426
Equity Securities without Readily Determinable Fair Value, Amount	24,769	19,225
Write-up of equity securities without readily determinable fair values	5,785
Equity securities	24,769	19,225
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount	2,532	971
OREO(c)	3,139	2,196
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans Receivable, Fair Value Disclosure	47,221	23,584
Provision for credit losses	45,709	4,405
Equity Securities without Readily Determinable Fair Value, Amount	24,671	19,134
Write-up of equity securities without readily determinable fair values	$ 5,785
Equity securities		$ 5,690

Fair Value Measurements, Unobse

Fair Value Measurements, Unobservable Inputs, Readily Quantifiable to Level 3 (details) - Fair Value, Inputs, Level 3	12 Months Ended
	Dec. 31, 2023
Valuation Technique, Discounted Cash Flow | Servicing Contracts [Member] | Minimum [Member]
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	6%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	1%
Valuation Technique, Discounted Cash Flow | Servicing Contracts [Member] | Maximum
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	8%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	100%
Valuation Technique, Discounted Cash Flow | Servicing Contracts [Member] | Weighted Average [Member]
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	6%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	4%
Valuation Technique, Discounted Cash Flow | Mortgage banking(a) | Minimum [Member]
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	31%
Valuation Technique, Discounted Cash Flow | Mortgage banking(a) | Maximum
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	100%
Valuation Technique, Discounted Cash Flow | Mortgage banking(a) | Weighted Average [Member]
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	89%
Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Minimum [Member]
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	18%
Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Maximum
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	53%
Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Weighted Average [Member]
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	53%

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial assets
Cash and Due from Banks	$ 484,384	$ 436,952
Interest-bearing deposits in other financial institutions	425,089	156,693
Federal funds sold and securities purchased under agreements to resell	14,350	27,810
Debt Securities, Available-for-sale	3,600,892	2,742,025
Investment securities held to maturity	3,860,235	3,960,451
Investment securities held to maturity, fair value	3,380,624	3,401,018
Equity Securities with Readily Determined Fair Value	7,000	6,000
Equity Securities without Readily Determinable Fair Value, Amount	35,000	19,000
Equity securities	41,651	25,216
FHLB and Federal Reserve Bank stocks	229,171	295,496
Commercial Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	90,303	0
Loans and Leases Receivable, Net Amount	28,865,124	28,486,849
Life Insurance, Corporate or Bank Owned, Amount	682,649	676,530
Servicing Asset at Fair Value, Amount	84,390	77,351	$ 57,158
Financial liabilities
Short-term funding	326,780	605,937
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,940,194	4,319,861
Other long-term funding	1,741,463
Commitment on standby letters of credit	212,000	271,000
Fair Value, Inputs, Level 1
Financial assets
Cash and Due from Banks	484,384	436,952
Interest-bearing deposits in other financial institutions	425,089	156,693
Federal funds sold and securities purchased under agreements to resell	14,350	27,810
Debt Securities, Available-for-sale	35,902	109,378
Investment securities held to maturity	999	999
Investment securities held to maturity, fair value	963	936
Equity securities with readily determinable fair value, Carrying Amount	6,883	5,991
Equity Securities with Readily Determined Fair Value	6,883	5,991
Fair Value, Inputs, Level 2
Financial assets
Debt Securities, Available-for-sale	3,564,990	2,632,647
Investment securities held to maturity	3,859,161	3,959,399
Investment securities held to maturity, fair value	3,379,586	3,400,028
FHLB and Federal Reserve Bank stocks	229,171	295,496
Loans Held-for-sale, Fair Value Disclosure	33,011	20,383
Commercial Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	90,303	0
Commercial loans held for sale	90,303	0
Life Insurance, Corporate or Bank Owned, Amount	682,649	676,530
Financial liabilities
Brokered CDs and other time deposits	7,315,973	1,930,158
Brokered CDs and other time deposits, fair value	7,315,973	1,930,158
Short-term funding	326,780	605,937
Short-term funding, fair value	326,757	605,205
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,940,194	4,319,861
Advances, Fair Value Disclosure	1,944,600	4,322,264
Other long-term funding	541,269	248,071
Long-term funding, fair value	534,983	242,151
Standby letters of credit	2,157	2,881
Standby letters of credit, fair value	2,157	2,881
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Assets	123,284	67,603
Derivatives (trading and other assets), fair value	123,284	67,603
Fair Value, Inputs, Level 2 | Liability
Financial liabilities
Derivative Liability	202,285	254,033
Derivatives (trading and other liabilities), fair value	202,285	254,033
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	24,769	19,225
Equity securities	24,769	19,225
Loans and Leases Receivable, Net Amount	28,865,124	28,486,849
Loans Receivable, Fair Value Disclosure	27,371,086	27,481,426
Servicing Asset	84,390	77,351
Servicing Asset at Fair Value, Amount	84,390	77,351
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	26,130,076	27,705,996
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts, fair value	26,130,076	27,705,996
Fair Value, Inputs, Level 3 | Mortgage banking(a)
Financial assets
Derivative Assets	439	86
Financial liabilities
Derivative Liability	673	46
Derivatives (trading and other liabilities), fair value	673	46
Fair Value, Inputs, NAV
Financial assets
Equity securities with readily determinable fair value, Carrying Amount	10,000	0
Equity Securities with Readily Determined Fair Value	$ 10,000	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details) Textuals	12 Months Ended
	Dec. 31, 2023 shares
Fair Value Disclosures [Abstract]
Visa Restricted Stock Owned at Fair Value [Member]	76,000
Visa Restricted Shares Owned	76,000
Visa Class A Shares Current Conversion from Class B	120,650

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Associated Banc-Corp
Regulatory Capital [Abstract]
Total capital	$ 3,997,205	$ 3,680,227
Total Capital Actual Ratio	12.21%	11.33%
Total Capital for Capital Adequacy Purposes Amount	$ 2,618,596	$ 2,597,589
Total Capital for Adequacy Purposes Ratio	8%	8%
Tier 1 Capital Actual Amount	$ 3,269,050	$ 3,229,690
Tier 1 Capital Actual Ratio	9.99%	9.95%
Tier 1 Capital for Adequacy Purposes Amount	$ 1,963,947	$ 1,948,192
Tier 1 Capital for Adequacy Purposes Ratio	6%	6%
Common Equity Tier One Capital	$ 3,074,938	$ 3,035,578
Common Equity Tier One Capital to Risk Weighted Assets	9.39%	9.35%
Common Equity Tier One Capital Required for Capital Adequacy	$ 1,472,960	$ 1,461,144
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 Leverage Capital Actual Amount	$ 3,269,050	$ 3,229,690
Tier 1 Leverage Capital Actual Ratio	8.06%	8.59%
Tier 1 Leverage Capital for Adequacy Purposes Amount	$ 1,622,053	$ 1,504,035
Tier 1 Leverage Capital for Adequacy Purposes Ratio	4%	4%
Associated Bank, N.A.
Regulatory Capital [Abstract]
Total capital	$ 3,803,052	$ 3,594,845
Total Capital Actual Ratio	11.64%	11.09%
Total Capital for Capital Adequacy Purposes Amount	$ 2,614,469	$ 2,593,728
Total Capital for Adequacy Purposes Ratio	8%	8%
Total Capital to be Well Capitalized Amount	$ 3,268,086	$ 3,242,160
Total Capital to be Well Capitalized Ratio	10%	10%
Tier 1 Capital Actual Amount	$ 3,167,182	$ 3,243,349
Tier 1 Capital Actual Ratio	9.69%	10%
Tier 1 Capital for Adequacy Purposes Amount	$ 1,960,852	$ 1,945,296
Tier 1 Capital for Adequacy Purposes Ratio	6%	6%
Tier 1 Capital To Be Well Capitalized Amount	$ 2,614,469	$ 2,593,728
Tier 1 Capital To Be Well Capitalized Ratio	8%	8%
Common Equity Tier One Capital	$ 3,167,182	$ 3,243,349
Common Equity Tier One Capital to Risk Weighted Assets	9.69%	10%
Common Equity Tier One Capital Required for Capital Adequacy	$ 1,470,639	$ 1,458,972
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 Equity Capital to be Well Capitalized Amount	$ 2,124,256	$ 2,107,404
Tier 1 Equity Capital to be Well Capitalized Ratio	6.50%	6.50%
Tier 1 Leverage Capital Actual Amount	$ 3,167,182	$ 3,243,349
Tier 1 Leverage Capital Actual Ratio	7.82%	8.63%
Tier 1 Leverage Capital for Adequacy Purposes Amount	$ 1,620,970	$ 1,503,666
Tier 1 Leverage Capital for Adequacy Purposes Ratio	4%	4%
Tier 1 Leverage Capital To Be Well Capitalized Amount	$ 2,026,212	$ 1,879,583
Tier 1 Leverage Capital To Be Well Capitalized Ratio	5%	5%

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 182,956	$ 366,122	$ 350,994
Preferred stock dividends	(11,500)	(11,500)	(17,111)
Net income available to common equity	171,456	354,622	333,883
Common shareholder dividends	(128,748)	(122,417)	(115,212)
Unvested share-based payment awards	(785)	(720)	(849)
Undistributed earnings	41,922	231,485	217,822
Undistributed earnings allocated to common shareholders	41,675	229,995	216,299
Undistributed earnings allocated to unvested share-based payment awards	247	1,490	1,523
Undistributed earnings	41,922	231,485	217,822
Basic
Distributed earnings to common shareholders	128,748	122,417	115,212
Undistributed earnings allocated to common shareholders	41,675	229,995	216,299
Total common shareholders earnings, basic	170,424	352,412	331,510
Diluted
Distributed earnings to common shareholders	128,748	122,417	115,212
Undistributed earnings allocated to common shareholders	41,675	229,995	216,299
Total common shareholders earnings, diluted	$ 170,424	$ 352,412	$ 331,510
Weighted average common shares outstanding	149,968	149,162	150,773
Effect of dilutive common stock awards	892	1,334	1,214
Diluted weighted average common shares outstanding	150,860	150,496	151,987
Basic earnings per common share	$ 1.14	$ 2.36	$ 2.20
Diluted earnings per common share	$ 1.13	$ 2.34	$ 2.18

Earnings Per Common Share Narra

Earnings Per Common Share Narrative (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3	2	3

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Income Statement Data Abstract
Net interest income	$ 1,039,573	$ 957,321	$ 725,855
Net intersegment interest income (expense)	0	0	0
Segment net interest income	1,039,573	957,321	725,855
Noninterest income	63,182	282,370	332,364
Total revenue	1,102,756	1,239,691	1,058,219
Provision for credit losses	83,021	32,998	(88,011)
Noninterest expense	813,682	747,063	709,924
Income before income taxes	206,052	459,630	436,307
Income tax expense	23,097	93,508	85,313
Net income	182,956	366,122	350,994
Goodwill	1,104,992	1,104,992	1,104,992
Operating Segments | Corporate and Commercial Specialty [Member]
Segment Income Statement Data Abstract
Net interest income	958,046	566,566	361,634
Net intersegment interest income (expense)	(391,276)	(103,360)	18,001
Segment net interest income	566,769	463,205	379,636
Noninterest income	136,995	145,751	165,345
Total revenue	703,764	608,956	544,980
Provision for credit losses	55,801	49,543	60,311
Noninterest expense	248,926	234,234	219,655
Income before income taxes	399,037	325,179	265,015
Income tax expense	71,766	59,000	46,906
Net income	327,271	266,179	218,109
Goodwill	525,836	525,836	525,836
Operating Segments | Community, Consumer and Business [Member]
Segment Income Statement Data Abstract
Net interest income	285,175	322,725	289,075
Net intersegment interest income (expense)	447,100	176,164	62,376
Segment net interest income	732,276	498,889	351,451
Noninterest income	108,858	118,848	151,474
Total revenue	841,133	617,737	502,925
Provision for credit losses	28,258	20,755	20,622
Noninterest expense	435,986	417,042	401,206
Income before income taxes	376,889	179,939	81,097
Income tax expense	79,147	37,787	17,030
Net income	297,742	142,152	64,067
Goodwill	579,156	579,156	579,156
Operating Segments | Risk Management and Shared Services [Member]
Segment Income Statement Data Abstract
Net interest income	(203,647)	68,031	75,146
Net intersegment interest income (expense)	(55,824)	(72,803)	(80,378)
Segment net interest income	(259,471)	(4,772)	(5,232)
Noninterest income	(182,671)	17,772	15,546
Total revenue	(442,142)	12,999	10,314
Provision for credit losses	(1,038)	(37,300)	(168,944)
Noninterest expense	128,770	95,787	89,063
Income before income taxes	(569,873)	(45,488)	90,195
Income tax expense	(127,816)	(3,279)	21,377
Net income	(442,057)	(42,209)	68,818
Goodwill	$ 0	$ 0	$ 0

Segment Reporting (Details Text

Segment Reporting (Details Textuals)	12 Months Ended
	Dec. 31, 2023 segment
Segment Reporting Information [Line Items]
Number of Reportable Segments	3

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (272,799)
HTM investment securities, net, at amortized cost(a)	9,025	$ 9,870	$ 1,551
Personnel	(468,355)	(454,101)	(426,687)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(956)	(54)	0
Net other comprehensive income (loss) during period	101,703	(262,483)	(22,935)
Ending Balance	(171,096)	(272,799)
Fair value adjustment on cash flow hedges	(13,254)	3,626	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	13,930	(212)	0
AFS Investment Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(233,192)	(5,266)	41,325
Other comprehensive income (loss) before reclassifications	41,145	(250,273)	(63,714)
Unrealized (losses) on AFS securities transferred to HTM securities		(67,604)
Investment securities losses, net	64,940	1,922	16
HTM investment securities, net, at amortized cost(a)	9,025	9,870	1,551
Personnel	0	0	0
Other Expenses	0	0	0
Other Comprehensive Income (Loss), Tax	(30,560)	78,159	15,557
Net other comprehensive income (loss) during period	84,550	(227,926)	(46,591)
Ending Balance	(148,641)	(233,192)	(5,266)
Fair value adjustment on cash flow hedges	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	3,360	0	0
Other comprehensive income (loss) before reclassifications	0	0	0
Unrealized (losses) on AFS securities transferred to HTM securities			0
Investment securities losses, net	0	0	0
HTM investment securities, net, at amortized cost(a)	0	0	0
Personnel	0	0	0
Other Expenses	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(956)	(54)	0
Net other comprehensive income (loss) during period	(280)	3,360	0
Ending Balance	3,080	3,360	0
Fair value adjustment on cash flow hedges	(13,254)	3,626
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	13,930	(212)
Defined Benefit Pension and Postretirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(42,968)	(5,051)	(28,707)
Other comprehensive income (loss) before reclassifications	24,091	(51,745)	25,519
Unrealized (losses) on AFS securities transferred to HTM securities		0
Investment securities losses, net	0	0	0
HTM investment securities, net, at amortized cost(a)	0	0	0
Personnel	(326)	(325)	1,346
Other Expenses	(29)	658	4,594
Other Comprehensive Income (Loss), Tax	(6,304)	13,495	(7,803)
Net other comprehensive income (loss) during period	17,432	(37,917)	23,656
Ending Balance	(25,535)	(42,968)	(5,051)
Fair value adjustment on cash flow hedges	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(272,799)	(10,317)	12,618
Other comprehensive income (loss) before reclassifications	65,236	(302,018)	(38,195)
Unrealized (losses) on AFS securities transferred to HTM securities		(67,604)
Investment securities losses, net	64,940	1,922	16
HTM investment securities, net, at amortized cost(a)	9,025	9,870	1,551
Personnel	(326)	(325)	1,346
Other Expenses	(29)	658	4,594
Other Comprehensive Income (Loss), Tax	(37,820)	91,601	7,754
Net other comprehensive income (loss) during period	101,703	(262,483)	(22,935)
Ending Balance	$ (171,096)	(272,799)	$ (10,317)
Fair value adjustment on cash flow hedges		3,626
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		$ (212)

Revenues Revenue Recognition by

Revenues Revenue Recognition by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		$ 186,560	$ 201,953	$ 212,278
Noninterest Income, Outside of Scope of Topic 606		(123,377)	80,417	120,086
Total noninterest income		63,182	282,370	332,364
Wealth management fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606	[1]	82,502	84,122	89,854
Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		49,045	62,310	64,406
Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		45,121	44,132	43,124
Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		9,891	11,389	14,894
Corporate and Commercial Specialty [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		97,261	101,873	110,340
Noninterest Income, Outside of Scope of Topic 606		39,734	43,878	55,004
Corporate and Commercial Specialty [Member] | Wealth management fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		82,502	84,122	89,854
Corporate and Commercial Specialty [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		10,907	13,240	15,880
Corporate and Commercial Specialty [Member] | Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		1,808	1,547	1,397
Corporate and Commercial Specialty [Member] | Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		2,044	2,964	3,208
Community, Consumer and Business [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		88,483	98,595	100,942
Noninterest Income, Outside of Scope of Topic 606		20,375	20,253	50,532
Community, Consumer and Business [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		38,115	49,052	48,493
Community, Consumer and Business [Member] | Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		43,286	42,474	41,730
Community, Consumer and Business [Member] | Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		7,082	7,069	10,719
Risk Management and Shared Services [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		815	1,485	996
Noninterest Income, Outside of Scope of Topic 606		(183,486)	16,286	14,550
Risk Management and Shared Services [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		23	18	32
Risk Management and Shared Services [Member] | Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		28	111	(3)
Risk Management and Shared Services [Member] | Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		764	1,356	967
Operating Segments [Member] | Corporate and Commercial Specialty [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		136,995	145,751	165,345
Operating Segments [Member] | Community, Consumer and Business [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		108,858	118,848	151,474
Operating Segments [Member] | Risk Management and Shared Services [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		$ (182,671)	$ 17,772	$ 15,546
[1](a)

Recent Developments (Details)

Recent Developments (Details) - $ / shares	Jan. 30, 2024	Feb. 10, 2023	Jun. 01, 2020	Sep. 19, 2018
Recent Developments [Line Items]
Interest Added to 5 Year UST Rate		2.812%
Series E Preferred Stock
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.875%			5.875%
Series F Preferred Stock [Member]
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage			5.625%
Subsequent Event [Member]
Recent Developments [Line Items]
Dividends Payable, Date Declared	Jan. 30, 2024
Subsequent Event [Member] | Common Stock [Member]
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 15, 2024
Dividends Payable, Date of Record	Mar. 01, 2024
Subsequent Event [Member] | Common Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Common stock, dividends declared ($ per share)	$ 0.22
Subsequent Event [Member] | Series E Preferred Stock
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 15, 2024
Dividends Payable, Date of Record	Mar. 01, 2024
Subsequent Event [Member] | Series E Preferred Stock | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred stock, dividends declared ($ per share)	$ 0.3671875
Subsequent Event [Member] | Series F Preferred Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred stock, dividends declared ($ per share)	$ 0.3515625
Preferred Stock, Dividend Rate, Percentage	5.625%