Associated Banc-Corp (ASB) 10-K 12 Feb 25 2024 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2024	Jan. 31, 2025	Jun. 30, 2024
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
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			$ 3,150,869,057
Entity Common Stock, Shares Outstanding		166,245,596
Documents Incorporated by Reference	Portions of the registrant's Proxy Statement for the Annual Meeting of Shareholders to be held on April 29, 2025 are incorporated by reference in this Form 10-K into Part III.
Entity Central Index Key	0000007789
Document Fiscal Year Focus	2024
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 [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 5.875% 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, 2024	Dec. 31, 2023
Assets [Abstract]
Debt Securities, Available-for-sale	$ 4,581,434	$ 3,600,892
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	3,738,687	3,860,160
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,242	41,651
Loans and Leases Receivable, Net of Deferred Income	29,768,586	29,216,218
Loans and Leases Receivable, Allowance	(363,545)	(351,094)
Other Short-Term Investments	258,886	258,067
Property, Plant and Equipment, Net	379,093	372,978
Goodwill	1,104,992	1,104,992
Intangible Assets, Net (Excluding Goodwill)	31,660	40,471
Servicing Asset at Fair Value, Amount	87,683	84,390
Interest Receivable	167,772	169,569
Other Assets	676,987	658,604
Assets, Total	43,023,068	41,015,855
Liabilities and Equity [Abstract]
Noninterest-Bearing Domestic Deposit, Demand	5,775,657	6,119,956
Interest-Bearing Deposit Liabilities, Domestic	28,872,777	27,326,093
Deposits, Total	34,648,434	33,446,049
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	470,369	326,780
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Other Long-Term Debt	837,635	541,269
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	38,776	34,776
Other Liabilities	568,485	552,814
Liabilities, Total	38,417,506	36,841,882
Equity, Attributable to Parent [Abstract]
Preferred Stock, Including Additional Paid in Capital		194,112
Common Stock, Value, Issued		1,752
Additional Paid in Capital, Common Stock		1,714,822
Retained Earnings (Accumulated Deficit)		2,946,805
Accumulated Other Comprehensive Income (Loss), Net of Tax		(171,096)
Treasury Stock, Value		(512,421)
Total Common Equity	4,411,450	3,979,861
Equity, Attributable to Parent, Total	4,605,562	4,173,973
Liabilities and Equity, Total	$ 43,023,068	$ 41,015,855
Preferred Stock, Shares Authorized	750,000	750,000
Preferred Stock, Shares Issued	200,000	200,000
Common Stock, Shares Authorized	250,000,000	250,000,000
Common Stock, Shares, Issued	189,016,409	175,216,409
Common Stock, Shares, Outstanding	166,177,658	151,036,674
Preferred Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Residential Mortgage [Member]
Assets [Abstract]
Loans and Leases Receivable, Net of Deferred Income	$ 7,047,541	$ 7,864,891
Liabilities and Equity [Abstract]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	553	835
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Federal Funds Sold and Securities Purchased under Agreements to Resell	21,955	14,350
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	179,665	229,171
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Liabilities and Equity [Abstract]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Other Long-Term Debt	837,635	541,269
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage [Member]
Assets [Abstract]
Financing Receivable, Held-for-Sale	646,687	33,011
Fair Value, Inputs, Level 2 [Member] | Commercial Loan
Assets [Abstract]
Financing Receivable, Held-for-Sale	32,634	90,303
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Loans and Leases Receivable, Net Amount	29,405,041	28,865,124
Servicing Asset at Fair Value, Amount	87,683	84,390
Liabilities and Equity [Abstract]
Noninterest-Bearing Domestic Deposit, Demand	$ 5,775,657	$ 6,119,956

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2024	Dec. 31, 2023
Equity, Attributable to Parent [Abstract]
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest and Dividend Income, Operating [Abstract]
Interest and Fee Income, Loans and Leases		$ 1,830,241	$ 1,720,406	$ 992,642
Interest and Dividend Income, Securities, by Taxable Status [Abstract]
Interest Income, Securities, Operating, Taxable		198,579	146,006	75,444
Interest Income, Securities, Operating, Tax Exempt		58,572	63,233	65,691
Other Interest and Dividend Income		35,312	28,408	11,475
Interest and Dividend Income, Operating, Total		2,122,704	1,958,052	1,145,252
Interest Expense, Operating and Nonoperating [Abstract]
Interest Expense, Deposits		901,804	673,624	98,309
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase		11,754	12,238	3,480
Interest Expense, Other Short-Term Borrowings		17,597	1	2
Interest on FHLB Funding		98,520	196,535	75,487
Interest Expense, Long-Term Debt		45,781	36,080	10,653
Interest Expense, Operating and Nonoperating, Total		1,075,456	918,479	187,931
Interest Income (Expense), Operating, Total		1,047,248	1,039,573	957,321
Provision for Loan, Lease, and Other Losses		84,986	83,021	32,998
Interest Income (Expense), after Provision for Loan Loss, Total		962,263	956,552	924,323
Noninterest Income [Abstract]
Capital Market Fees Net		22,084	24,649	29,917
Fees and Commissions, Mortgage Banking and Servicing		10,686	19,429	18,873
Gain (Loss) on Sale of Mortgage Loans		(130,406)	(136,239)	0
Bank Owned Life Insurance Income		13,477	10,266	11,431
Gain (Loss) on Disposition of Assets	[1]	(1,042)	454	1,338
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment		(144,147)	(58,903)	3,746
Noninterest Income, Other Operating Income		9,310	9,691	10,715
Noninterest Income, Total		(9,407)	63,182	282,370
Noninterest Expense [Abstract]
Labor and Related Expense		487,956	468,355	454,101
Information Technology and Data Processing		107,563	102,018	90,700
Occupancy, Net		54,622	57,204	59,794
Marketing and Advertising Expense		28,142	28,405	25,525
Equipment Expense		18,431	19,663	19,632
Professional Fees		21,601	19,911	18,250
Payments of Financing Costs		8,471	5,408	5,925
Federal Deposit Insurance Corporation Premium Expense		38,439	67,072	22,650
Amortization of Intangible Assets		8,811	8,811	8,811
Prepayment Fees on Advances, Net		14,243	0	0
Other Noninterest Expense		30,118	36,837	41,675
Noninterest Expense, Total		818,397	813,682	747,063
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		134,459	206,052	459,630
Income Tax Expense (Benefit)		11,314	23,097	93,508
Net Income (Loss) Attributable to Parent, Total		123,145	182,956	366,122
Preferred Stock Dividends and Other Adjustments		11,500	11,500	11,500
Net Income (Loss) Available to Common Stockholders, Basic, Total		$ 111,645	$ 171,456	$ 354,622
Earnings Per Share [Abstract]
Earnings Per Share, Basic		$ 0.73	$ 1.14	$ 2.36
Earnings Per Share, Diluted		$ 0.72	$ 1.13	$ 2.34
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic		151,933	149,968	149,162
Weighted Average Number of Shares Outstanding, Diluted		153,347	150,860	150,496
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606		$ 92,569	$ 82,502	$ 84,122
Deposit Account [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606		51,642	49,045	62,310
Credit and Debit Card [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax		46,921	45,020	44,014
Financial Service, Other [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax		$ 19,499	$ 17,268	$ 15,903
[1]

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 123,145	$ 182,956	$ 366,122
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax	(23,978)	41,145	(250,273)
Net unrealized (losses) on AFS securities transferred to HTM, prior to transfer	0	0	(67,604)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	(8,360)	(9,025)	(9,870)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	148,380	64,940	1,922
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	(33,114)	(30,560)	78,159
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total	99,648	84,550	(227,926)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(21,537)	(13,254)	3,626
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	16,478	13,930	(212)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	710	(956)	(54)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(4,348)	(280)	3,360
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(290)	(326)	(325)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	2,210	24,091	(51,745)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(28)	(29)	658
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(511)	(6,304)	13,495
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,381	17,432	(37,917)
Other Comprehensive Income (Loss), Net of Tax	96,681	101,703	(262,483)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 219,826	$ 284,659	$ 103,639

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Series E Preferred Stock [Member]	Series F Preferred Stock [Member]	Performance/Service Based RSAs, RSA, [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common [Member]	Treasury Stock, Common [Member] Performance/Service Based RSAs, RSA, [Member]
Dividends [Abstract]
Preferred Stock, Shares Outstanding						200,000
Preferred Stock, Shares Outstanding | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]						200,000
Common Stock, Shares, Outstanding							175,216,000
Common Stock, Shares, Outstanding | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]							175,216,000
Equity, Attributable to Parent, Beginning Balance at Dec. 31, 2021		$ 4,024,853				$ 193,195	$ 1,752	$ 1,713,851	$ 2,672,601	$ (10,317)	$ (546,229)
Equity, Attributable to Parent, Beginning Balance (Cumulative Effect, Period of Adoption, Adjustment [Member]) at Dec. 31, 2021		1,713							1,713
Equity, Attributable to Parent, Beginning Balance (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2021		4,026,566				193,195	1,752	1,713,851	2,674,314	(10,317)	(546,229)
Equity, Attributable to Parent, Ending Balance at Dec. 31, 2022		4,015,490				194,112	$ 1,752	1,712,733	2,904,882	(272,799)	(525,190)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income (Loss) Attributable to Parent		366,122							366,122
Other Comprehensive Income (Loss), Net of Tax		(262,483)								(262,483)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		103,639
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture		11,061						(17,397)			28,458
Treasury Stock, Value, Acquired, Cost Method					$ (6,480)							$ (6,480)
Dividends [Abstract]
Dividends, Common Stock, Cash		123,137							123,137
Dividends, Preferred Stock, Cash	[1]	11,500							11,500
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition		16,280						16,280
Stockholders' Equity, Other		$ (938)				$ 916			(916)		(938)
Common Stock, Dividends, Per Share, Cash Paid		$ 0.81
Preferred Stock, Dividends, Per Share, Cash Paid			$ 1.46875	$ 1.40625
Preferred Stock, Shares Outstanding						200,000
Common Stock, Shares, Outstanding							175,216,000
Equity, Attributable to Parent, Ending Balance at Dec. 31, 2023		$ 4,173,973				$ 194,112	$ 1,752	1,714,822	2,946,805	(171,096)	(512,421)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income (Loss) Attributable to Parent		182,956							182,956
Other Comprehensive Income (Loss), Net of Tax		101,703								101,703
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		284,659
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture		4,297						(15,065)			19,362
Treasury Stock, Value, Acquired, Cost Method					(6,593)							(6,593)
Dividends [Abstract]
Dividends, Common Stock, Cash		129,534							129,534
Dividends, Preferred Stock, Cash	[1]	11,500							11,500
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition		$ 17,155						17,155
Stockholders' Equity, Other											0
Common Stock, Dividends, Per Share, Cash Paid		$ 0.85
Preferred Stock, Dividends, Per Share, Cash Paid			1.46875	1.40625
Preferred Stock, Shares Outstanding						200,000
Common Stock, Shares, Outstanding		151,036,674					175,216,000
Equity, Attributable to Parent, Ending Balance at Dec. 31, 2024		$ 4,605,562				$ 194,112	$ 1,890	2,047,349	2,919,252	(74,416)	(482,626)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income (Loss) Attributable to Parent		123,145							123,145
Other Comprehensive Income (Loss), Net of Tax		96,681								$ 96,681
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		219,826
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Stock Issued During Period, Shares, New Issues							13,800,000
Stock Issued During Period, Value, New Issues		331,023					$ 138	330,885
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture		37,576						(16,742)			54,318
Treasury Stock, Value, Acquired, Cost Method		(18,289)			$ (6,234)						(18,289)	$ (6,234)
Dividends [Abstract]
Dividends, Common Stock, Cash		139,197							139,197
Dividends, Preferred Stock, Cash	[1]	11,500							$ 11,500
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition		$ 18,384						$ 18,384
Stockholders' Equity, Other											$ 0
Common Stock, Dividends, Per Share, Cash Paid		$ 0.89
Preferred Stock, Dividends, Per Share, Cash Paid			$ 1.46875	$ 1.40625
Preferred Stock, Shares Outstanding						200,000
Common Stock, Shares, Outstanding		166,177,658					189,016,000
[1]Series E, $1.46875 per share; and Series F, $1.40625 per share.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss)		$ 123,145	$ 182,956	$ 366,122
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Provision for Loan, Lease, and Other Losses		84,986	83,021	32,998
Depreciation		48,845	46,989	45,088
Mortgage Servicing Rights (MSR) Impairment (Recovery)		(4,646)	(10,660)	(22,264)
Amortization of Intangible Assets		8,811	8,811	8,811
Accretion (Amortization) of Discounts and Premiums, Investments		44,857	38,508	14,980
Other Depreciation and Amortization		34,841	34,246	34,684
Marketable Securities, Gain (Loss)		144,326	64,864	1,674
Gain (Loss) on Disposition of Assets	[1]	1,042	(454)	(1,338)
(Gain) loss on mortgage banking activities, net		3,529	2,919	3,654
Gain (Loss) on Sale of Mortgage Loans		130,406	136,239	0
Payments for Origination and Purchases of Loans Held-for-sale		(617,889)	(395,834)	(600,114)
Proceeds from Sale, Loan, Mortgage, Held-for-Sale		584,781	367,707	715,035
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]
Increase (Decrease) in Accrued Interest Receivable, Net		1,797	(25,120)	(63,921)
Increase (Decrease) in Income Taxes		(36,748)	(77,849)	40,611
Increase (Decrease) in Interest Payable, Net		(960)	78,539	12,608
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities		13,315	16,329	(5,297)
Increase (Decrease) in Derivative Assets and Liabilities		(1,127)	(93,916)	269,774
Increase (Decrease) in Other Operating Assets and Liabilities, Net		16,940	(14,556)	(6,539)
Net Cash Provided by (Used in) Operating Activities, Total		580,249	442,740	846,566
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments for (Proceeds from) Loans and Leases		(1,334,611)	(1,546,391)	(4,579,431)
Payments for Investing Activities [Abstract]
Payments to Acquire Debt Securities, Available-for-Sale		(3,315,219)	(1,936,635)	(959,977)
Payments to Acquire Held-to-Maturity Securities		0	(38,677)	(301,052)
Payments to Acquire Federal Home Loan Bank Stock		(154,413)	(146,308)	(128,620)
Proceeds from Investing Activities [Abstract]
Proceeds from Sale of Debt Securities, Available-for-sale		1,141,231	715,066	110,177
Proceeds from Sale of Other Investments		226,758	202,451	528
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale		1,159,775	397,675	494,197
Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities		123,748	143,001	196,605
Proceeds from Maturities, Prepayments and Calls of Other Investments		13,539	21,267	33,795
Proceeds from Sale of Mortgage Portfolio		0	844,362	0
Payments for (Proceeds from) Productive Assets		(44,987)	(61,813)	(62,711)
Net Change in Tax Credit Investments		(34,818)	(30,255)	(58,323)
Net Cash Provided by (Used in) Investing Activities, Total		(2,218,997)	(1,436,257)	(5,254,811)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Increase (Decrease) in Deposits		1,202,385	3,809,948	1,169,983
Proceeds from (Repayments of) Short-Term Debt		143,589	(279,157)	251,674
Increase (Decrease) in Loans from Federal Home Loan Banks		510,000	(2,385,000)	3,125,000
Payments of FHLBank Borrowings, Financing Activities		(601,011)	(599)	(413,558)
Proceeds from FHLBank Borrowings, Financing Activities		2,656	1,369	1,775
Prepayment Fees on Advances, Net		(14,243)	0	0
Proceeds from Issuance of Long-term Debt		298,800	292,740	0
Payments of Debt Issuance Costs		(936)	0	0
Finance Lease, Principal Payments		(88)	(86)	306
Proceeds from Issuance of Common Stock		331,023	0	0
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised		37,576	4,297	11,061
Payments of Ordinary Dividends, Common Stock		(139,197)	(129,534)	(123,137)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock		(11,500)	(11,500)	(11,500)
payments for repurchase of common stock for tax withholding		0	0	(938)
Net Cash Provided by (Used in) Financing Activities, Total		1,734,529	1,295,885	4,004,185
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total		95,781	302,368	(404,060)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance		923,823	621,455	1,025,515
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance		1,019,604	923,823	621,455
Supplemental Cash Flow Information [Abstract]
Interest Paid, Excluding Capitalized Interest, Operating Activities		1,075,196	838,828	174,675
Income Taxes Paid, Net		17,749	69,417	18,395
Real Estate Owned, Transfer to Real Estate Owned		15,827	9,841	5,591
Servicing Asset at Fair Value, Additions		6,707	3,564	7,279
Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale		663,038	1,058,305	18
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Transfer, Amount		0	0	1,621,990
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount		0	5,785	5,690
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		(4,348)	(280)	3,360
Other Liabilities [Member]
Supplemental Cash Flow Information [Abstract]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge		661	(5,084)	16,163
Other Assets [Member]
Supplemental Cash Flow Information [Abstract]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge		4,208	(1,757)	1,405
Performance/Service Based RSAs, RSA, [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for Repurchase of Common Stock		(6,234)	(6,593)	(6,480)
Board Authorized Purchase Program [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for Repurchase of Common Stock		$ (18,289)	$ 0	$ 0
[1]

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
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. 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 2 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 2 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 3 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 3 for additional information on nonaccrual loans. 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. 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 3 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 3. 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. 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 3 for additional information on the ACLL and Note 15 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 3 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 term, 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 5 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 4 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 4 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 12 for additional information on income taxes. Derivative and Hedging Activities Derivative instruments are recorded in the consolidated balance sheets as either an asset or a liability and measured at fair value. Accounting for changes in fair value of derivatives depends on whether the derivative is designated and qualifies in a hedging relationship. At inception, the Corporation designates the derivative contract as either 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 non-designated hedge. Changes in the fair value of a derivative that has been designated and qualifies as a fair value hedge, along with the changes in the fair value of the hedged asset or liability that is attributable to the hedged risk, are recorded in current period earnings. Changes in the fair value of a derivative that has been designated and qualifies as a cash flow hedge are recorded in other comprehensive income, net of income taxes, and reclassified into earnings in the period during which the hedged item affects earnings. Changes in the fair value of derivatives which do not qualify for hedge accounting are reported in current period earnings. For those derivatives to which hedge accounting is applied, the Corporation formally documents the hedging relationship, the risk management objective, and strategy for undertaking the hedge. This documentation identifies the hedging instrument, the hedged item or transaction, the nature of the hedged risk, and, unless the hedge meets all of the criteria to assume there is no ineffectiveness, the method that will be used to assess the effectiveness of the hedging instrument. The Corporation typically assesses effectiveness using statistical regression at inception and on an ongoing basis, the shortcut method, or the critical terms match method. Shortcut method and critical terms match method assume perfect hedge effectiveness and eliminate the quantitative aspect of assessing hedge effectiveness. Hedge accounting is discontinued prospectively when: • The derivative is no longer effective or expected to be effective in offsetting changes in the fair value, cash flows, or changes in net investment of a hedged item (including firm commitments or forecasted transactions); • The derivative expires, is sold, terminated, or exercised; • The forecasted transaction is no longer probable of occurring by the end of the originally specified time period; • The hedged firm commitment no longer meets the definition of a firm commitment; or • the designation of the derivative as a hedging instrument is removed. When hedge accounting is discontinued and the derivative no longer qualifies as an effective fair value or cash flow hedge, the derivative continues to be carried on the balance sheet at fair value and changes in fair value will be recorded in current period earnings unless re-designated. Like other financial instruments, derivatives contain an element of credit risk, which is the possibility that the Corporation will incur a loss because the counterparty fails to meet its contractual obligations. Notional values of interest rate swaps and other off-balance sheet financial instruments significantly exceed the credit risk associated with these instruments and represent contractual balances on which calculations of amounts to be exchanged are based. Credit exposure is limited to the sum of the aggregate fair value of positions that have become favorable to the Corporation, including any accrued interest receivable due from counterparties. Potential credit losses are mitigated by derivatives through central clearing parties, careful evaluation of counterparty credit standing, selection of counterparties from a limited group of high quality institutions, collateral agreements, and other contract provisions. The corporation considers the value of collateral held and collateral provided in determining the net carrying value of derivatives. See Note 13 for additional information on derivatives and hedging activities. 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 8 for additional information on repurchase agreements. 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

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2024
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions: The Corporation did not have any business acquisitions during 2022, 2023 or 2024. Dispositions: The Corporation did not have any business dispositions during 2023 or 2024.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets. The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities Obligations of state and political subdivisions (municipal securities) $ 3,063 $ — $ (58) $ 3,005 Residential mortgage-related securities: FNMA/FHLMC 120,272 190 (9,534) 110,928 GNMA 4,236,199 5,379 (13,851) 4,227,727 Commercial mortgage-related securities: FNMA/FHLMC 18,332 — (1,332) 17,000 GNMA 116,275 — (4,800) 111,475 Asset backed securities: FFELP 108,319 123 (604) 107,839 SBA 495 — (24) 471 Other debt securities 3,000 — (11) 2,989 Total AFS investment securities $ 4,605,954 $ 5,693 $ (30,213) $ 4,581,434 HTM investment securities U.S. Treasury securities $ 1,000 $ — $ (1) $ 999 Obligations of state and political subdivisions (municipal securities) 1,659,722 1,122 (174,202) 1,486,642 Residential mortgage-related securities: FNMA/FHLMC 885,476 22,934 (186,464) 721,946 GNMA 43,693 9 (3,774) 39,927 Private-label 324,182 8,135 (65,963) 266,353 Commercial mortgage-related securities: FNMA/FHLMC 772,456 10,217 (159,078) 623,595 GNMA 52,219 236 (6,424) 46,032 Total HTM investment securities $ 3,738,747 $ 42,653 $ (595,906) $ 3,185,494 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 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, 2024, are shown below: AFS HTM ($ in thousands) Amortized Fair Amortized Fair Due in one year or less $ 1,000 $ 997 $ 17,800 $ 17,746 Due after one year through five years 3,040 3,026 62,054 61,286 Due after five years through ten years 1,390 1,387 187,803 179,653 Due after ten years 633 585 1,393,065 1,228,957 Total debt securities 6,063 5,994 1,660,722 1,487,641 Residential mortgage-related securities: FNMA/FHLMC 120,272 110,928 885,476 721,946 GNMA 4,236,199 4,227,727 43,693 39,927 Private-label — — 324,182 266,353 Commercial mortgage-related securities: FNMA/FHLMC 18,332 17,000 772,456 623,595 GNMA 116,275 111,475 52,219 46,032 Asset backed securities: FFELP 108,319 107,839 — — SBA 495 471 — — Total investment securities $ 4,605,954 $ 4,581,434 $ 3,738,747 $ 3,185,494 Ratio of fair value to amortized cost 99.5 % 85.2 % 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, 2024: ($ in thousands) AAA AA A Not Rated Total U.S. Treasury securities $ 1,000 $ — $ — $ — $ 1,000 Obligations of state and political subdivisions (municipal securities) 767,151 883,438 4,911 4,221 1,659,722 Residential mortgage-related securities: FNMA/FHLMC 885,476 — — — 885,476 GNMA 43,693 — — — 43,693 Private-label 324,182 — — — 324,182 Commercial mortgage-related securities: FNMA/FHLMC 772,456 — — — 772,456 GNMA 52,219 — — — 52,219 Total HTM securities $ 2,846,177 $ 883,438 $ 4,911 $ 4,221 $ 3,738,747 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 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) 2024 2023 2022 Gross realized gains on AFS securities $ — $ 83 $ 21 Gross realized (losses) on AFS securities (148,380) (65,022) (1,943) Gain on sale and net write-up of equity securities 4,233 6,037 5,668 Investment securities (losses) gains, net $ (144,147) $ (58,903) $ 3,746 Proceeds from sales of AFS investment securities $ 1,141,231 $ 715,066 $ 110,177 During the fourth quarter of 2024, the Corporation sold lower yielding AFS securities with a carrying value of $1.1 billion at a net loss of $148 million and reinvested the proceeds into higher yielding and lower risk-weighted GNMA securities. Additionally, during the first quarter of 2024, the Corporation sold its remaining Visa Class B restricted shares at a gain of $4 million. 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 into 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 were carried at fair value, were subsequently written up to reflect the new observable price resulting from that sale. Investment securities with a carrying value of $1.5 billion at December 31, 2024 and $1.6 billion at December 31, 2023 were pledged as required to secure certain deposits or for other purposes. Accrued interest receivable on HTM securities totaled $18 million at both December 31, 2024 and 2023. Accrued interest receivable on AFS securities totaled $21 million and $15 million at December 31, 2024 and 2023, respectively. Accrued interest receivable on both HTM and AFS securities is included in interest receivable on the consolidated balance sheets. The allowance for credit losses on HTM securities was approximately $60,000 and $75,000 at December 31, 2024 and 2023, respectively, attributable entirely to the Corporation's municipal securities, included in HTM investment securities, net, at amortized cost on the consolidated balance sheets. The Corporation also holds U.S. Treasury, municipal, and mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and private-label residential mortgage-related securities that have credit enhancement which covers the first 15% of losses and, as a result, no allowance for credit losses has been recorded related to these securities. The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2024: Less than 12 months 12 months or more Total ($ in thousands) Number Unrealized Fair Number Unrealized Fair Unrealized (Losses) Fair AFS investment securities Obligations of state and political subdivisions (municipal securities) 1 $ (3) $ 542 2 $ (55) $ 828 $ (58) $ 1,370 Residential mortgage-related securities: FNMA/FHLMC 23 (607) 31,983 14 (8,927) 61,596 (9,534) 93,579 GNMA 116 (13,706) 1,660,642 4 (145) 3,945 (13,851) 1,664,587 Commercial mortgage-related securities: FNMA/FHLMC — — — 1 (1,332) 17,000 (1,332) 17,000 GNMA — — — 16 (4,800) 111,475 (4,800) 111,475 Asset backed securities: FFELP — — — 12 (604) 62,830 (604) 62,830 SBA — — — 4 (24) 464 (24) 464 Other debt securities 1 (7) 993 1 (3) 997 (11) 1,989 Total 141 $ (14,323) $ 1,694,159 54 $ (15,890) $ 259,134 $ (30,213) $ 1,953,294 HTM investment securities U.S. Treasury securities — $ — $ — 1 $ (1) $ 999 $ (1) $ 999 Obligations of state and political subdivisions (municipal securities) 370 (11,860) 483,073 641 (162,343) 866,949 (174,202) 1,350,022 Residential mortgage-related securities: FNMA/FHLMC 12 (280) 11,617 106 (186,184) 710,114 (186,464) 721,732 GNMA 7 (183) 8,856 79 (3,591) 31,071 (3,774) 39,927 Private-label — — — 18 (65,963) 266,353 (65,963) 266,353 Commercial mortgage-related securities: FNMA/FHLMC 2 (1,343) 25,518 43 (157,735) 598,077 (159,078) 623,595 GNMA — — — 13 (6,424) 46,032 (6,424) 46,032 Total 391 $ (13,665) $ 529,064 901 $ (582,241) $ 2,519,595 $ (595,906) $ 3,048,660 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, 2023: 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 — $ — $ — 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 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, 2024 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. As of December 31, 2024, 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 $92 million and $143 million at December 31, 2024 and 2023, respectively. The Corporation had Federal Reserve Bank stock of $88 million and $87 million at December 31, 2024 and 2023, respectively. Accrued interest receivable on FHLB stock totaled $2 million and $4 million at December 31, 2024 and 2023, respectively. There was no accrued interest receivable on Federal Reserve Bank stock at both December 31, 2024 and 2023. 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 mutual funds. At December 31, 2024 and 2023, the Corporation had equity securities with readily determinable fair values of $11 million and $7 million, respectively. Equity securities without readily determinable fair values: The Corporation's portfolio of equity securities without readily determinable fair values primarily consists of an investment in a private loan fund. The Corporation had equity securities without readily determinable fair values carried at $13 million and $35 million at December 31, 2024 and 2023, respectively. During the first quarter of 2024, the Corporation sold all of its remaining Visa Class B restricted shares.

Loans

Loans	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans The period end loan composition was as follows: ($ in thousands) Dec 31, 2024 Dec 31, 2023 Commercial and industrial $ 10,573,741 $ 9,731,555 Commercial real estate - owner occupied 1,143,741 1,061,700 Commercial and business lending 11,717,483 10,793,255 Commercial real estate - investor 5,227,975 5,124,245 Real estate construction 1,982,632 2,271,398 Commercial real estate lending 7,210,607 7,395,644 Total commercial 18,928,090 18,188,898 Residential mortgage 7,047,541 7,864,891 Auto finance 2,810,220 2,256,162 Home equity 664,252 628,526 Other consumer 318,483 277,740 Total consumer 10,840,496 11,027,319 Total loans $ 29,768,586 $ 29,216,218 Accrued interest receivable on loans totaled $126 million at December 31, 2024, and $132 million at December 31, 2023, 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 years ended December 31, 2024 and December 31, 2023, and approximately $491,000 for the year ended December 31, 2022. The Corporation has granted loans to its directors, executive officers, or their related interests. These loans were made on substantially the same terms, including rates and collateral, as those prevailing at the time for comparable transactions with other unrelated customers, and do not involve more than a normal risk of collection. These loans to related parties are summarized below: ($ in thousands) 2024 2023 Balance at beginning of year $ 5,406 $ 3,376 New loans 17,395 2,564 Repayments (2,359) (253) Change due to status of executive officers and directors 838 (280) Balance at end of year $ 21,280 $ 5,406 The following table presents loans by credit quality indicator by origination year at December 31, 2024: Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2024 2023 2022 2021 2020 Prior Total Commercial and industrial: Risk rating: Pass $ 248 $ 1,841,790 $ 2,656,953 $ 1,514,277 $ 2,254,758 $ 1,080,180 $ 263,286 $ 510,301 $ 10,121,545 Special mention — 48,829 4,037 4,810 63,390 6,984 515 48 128,613 Substandard 2,015 40,240 90,240 9,677 34,730 126,134 3,347 131 304,500 Nonaccrual 42 — 772 4,468 12,988 855 — — 19,084 Commercial and industrial $ 2,306 $ 1,930,860 $ 2,752,002 $ 1,533,233 $ 2,365,866 $ 1,214,154 $ 267,148 $ 510,480 $ 10,573,741 Commercial real estate - owner occupied: Risk rating: Pass $ — $ 13,760 $ 228,913 $ 175,059 $ 180,132 $ 214,237 $ 114,064 $ 181,982 $ 1,108,147 Special mention — — — 497 — 8,619 — 2,803 11,920 Substandard — 943 2,532 10,009 1,492 701 3,371 3,125 22,173 Nonaccrual — — — 1,501 — — — — 1,501 Commercial real estate - owner occupied $ — $ 14,703 $ 231,446 $ 187,066 $ 181,625 $ 223,557 $ 117,435 $ 187,911 $ 1,143,741 Commercial and business lending: Risk rating: Pass $ 248 $ 1,855,550 $ 2,885,866 $ 1,689,336 $ 2,434,891 $ 1,294,416 $ 377,350 $ 692,283 $ 11,229,693 Special mention — 48,829 4,037 5,307 63,390 15,604 515 2,852 140,532 Substandard 2,015 41,183 92,772 19,686 36,222 126,835 6,719 3,255 326,673 Nonaccrual 42 — 772 5,969 12,988 855 — — 20,585 Commercial and business lending $ 2,306 $ 1,945,563 $ 2,983,447 $ 1,720,298 $ 2,547,491 $ 1,437,710 $ 384,583 $ 698,390 $ 11,717,483 Commercial real estate - investor: Risk rating: Pass $ — $ 190,451 $ 1,334,740 $ 725,652 $ 1,179,867 $ 723,994 $ 321,084 $ 363,288 $ 4,839,076 Special mention — — 69,014 6,385 30,672 12,312 6,870 10,366 135,618 Substandard — — 69,385 53,022 93,151 10,724 384 9,910 236,576 Nonaccrual — — 11,949 — — 4,757 — — 16,705 Commercial real estate - investor $ — $ 190,451 $ 1,485,088 $ 785,058 $ 1,303,690 $ 751,786 $ 328,338 $ 383,563 $ 5,227,975 Real estate construction: Risk rating: Pass $ — $ 30,090 $ 278,754 $ 390,845 $ 807,347 $ 142,137 $ 25,654 $ 7,260 $ 1,682,086 Special mention — — 19,419 — 96,442 — — — 115,862 Substandard — — 28,241 6,000 105,660 44,754 — — 184,654 Nonaccrual — — — — — — — 30 30 Real estate construction $ — $ 30,090 $ 326,414 $ 396,845 $ 1,009,450 $ 186,890 $ 25,654 $ 7,289 $ 1,982,632 Commercial real estate lending: Risk rating: Pass $ — $ 220,541 $ 1,613,494 $ 1,116,496 $ 1,987,215 $ 866,130 $ 346,738 $ 370,548 $ 6,521,163 Special mention — — 88,433 6,385 127,114 12,312 6,870 10,366 251,480 Substandard — — 97,626 59,022 198,811 55,477 384 9,910 421,230 Nonaccrual — — 11,949 — — 4,757 — 30 16,735 Commercial real estate lending $ — $ 220,541 $ 1,811,502 $ 1,181,903 $ 2,313,140 $ 938,677 $ 353,992 $ 390,853 $ 7,210,607 Total commercial: Risk rating: Pass $ 248 $ 2,076,092 $ 4,499,360 $ 2,805,832 $ 4,422,105 $ 2,160,547 $ 724,088 $ 1,062,831 $ 17,750,855 Special mention — 48,829 92,469 11,692 190,504 27,916 7,385 13,217 392,012 Substandard 2,015 41,183 190,399 78,708 235,033 182,313 7,103 13,165 747,903 Nonaccrual 42 — 12,721 5,969 12,988 5,612 — 30 37,320 Total commercial $ 2,306 $ 2,166,104 $ 4,794,949 $ 2,902,201 $ 4,860,631 $ 2,376,387 $ 738,576 $ 1,089,243 $ 18,928,090 Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2024 2023 2022 2021 2020 Prior Total Residential mortgage: Risk rating: Pass $ — $ — $ 172,607 $ 507,186 $ 1,579,182 $ 1,643,341 $ 1,195,752 $ 1,878,251 $ 6,976,319 Special mention — — — — — — — 162 162 Substandard — — 594 327 77 — — 24 1,022 Nonaccrual — — 2,338 2,134 11,420 10,141 8,297 35,708 70,038 Residential mortgage $ — $ — $ 175,539 $ 509,647 $ 1,590,679 $ 1,653,482 $ 1,204,049 $ 1,914,144 $ 7,047,541 Auto finance: Risk rating: Pass $ — $ — $ 1,241,609 $ 858,924 $ 650,880 $ 48,999 $ 67 $ 77 $ 2,800,555 Special mention — — 332 704 1,048 178 — — 2,262 Nonaccrual — — 491 2,162 4,284 466 — — 7,402 Auto finance $ — $ — $ 1,242,431 $ 861,790 $ 656,212 $ 49,643 $ 67 $ 77 $ 2,810,220 Home equity: Risk rating: Pass $ 8,764 $ 569,866 $ 411 $ 1,684 $ 25,372 $ 5,289 $ 1,965 $ 50,841 $ 655,429 Special mention 127 81 41 — — — — 323 445 Nonaccrual 1,677 104 15 103 933 231 215 6,778 8,378 Home equity $ 10,568 $ 570,051 $ 467 $ 1,788 $ 26,305 $ 5,520 $ 2,180 $ 57,941 $ 664,252 Other consumer: Risk rating: Pass $ 308 $ 241,230 $ 14,343 $ 4,808 $ 2,475 $ 1,440 $ 584 $ 49,886 $ 314,767 Special mention — 1,125 8 — 36 7 — — 1,176 Substandard — 2,418 — — — — — — 2,418 Nonaccrual 2 81 5 21 7 4 — 4 122 Other consumer $ 310 $ 244,855 $ 14,356 $ 4,829 $ 2,518 $ 1,451 $ 584 $ 49,891 $ 318,483 Total consumer: Risk rating: Pass $ 9,071 $ 811,096 $ 1,428,969 $ 1,372,603 $ 2,257,910 $ 1,699,069 $ 1,198,368 $ 1,979,055 $ 10,747,070 Special mention 127 1,207 381 704 1,083 185 — 484 4,045 Substandard — 2,418 594 327 77 — — 24 3,440 Nonaccrual 1,679 185 2,849 4,420 16,644 10,842 8,512 42,490 85,941 Total consumer $ 10,878 $ 814,906 $ 1,432,794 $ 1,378,053 $ 2,275,714 $ 1,710,096 $ 1,206,880 $ 2,022,053 $ 10,840,496 Total loans: Risk rating: Pass $ 9,320 $ 2,887,188 $ 5,928,329 $ 4,178,435 $ 6,680,015 $ 3,859,616 $ 1,922,456 $ 3,041,886 $ 28,497,925 Special mention 127 50,036 92,851 12,396 191,587 28,101 7,385 13,701 396,057 Substandard 2,015 43,602 190,993 79,035 235,110 182,313 7,103 13,189 751,344 Nonaccrual 1,721 185 15,570 10,389 29,632 16,453 8,512 42,519 123,260 Total loans $ 13,183 $ 2,981,010 $ 6,227,743 $ 4,280,254 $ 7,136,344 $ 4,086,483 $ 1,945,455 $ 3,111,296 $ 29,768,586 (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, 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 $ 1,693,249 $ 1,736,617 $ 2,877,173 $ 1,824,362 $ 398,046 $ 383,695 $ 449,006 $ 9,362,149 Special mention — 21,779 4,017 46,610 8,525 3,529 — 25,341 109,801 Substandard 804 81,924 10,515 39,748 47,279 17,732 94 291 197,582 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 Substandard — 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 $ 1,708,642 $ 1,940,657 $ 3,065,177 $ 2,063,580 $ 534,581 $ 519,426 $ 541,345 $ 10,373,408 Special mention — 22,050 4,017 46,610 14,675 6,164 — 26,634 120,150 Substandard 804 82,216 25,250 42,539 53,695 26,269 3,180 3,132 236,281 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 $ 1,247,434 $ 1,080,425 $ 471,371 $ 358,996 $ 239,230 $ 4,816,433 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Substandard — — 106,002 69,584 15,000 983 — 24,025 215,595 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 $ 2,424,042 $ 1,628,250 $ 559,052 $ 364,737 $ 247,184 $ 7,087,824 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Substandard — — 106,002 69,584 15,000 983 — 24,025 215,595 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 $ 1,887,058 $ 3,626,800 $ 5,489,219 $ 3,691,830 $ 1,093,633 $ 884,162 $ 788,529 $ 17,461,232 Special mention — 22,552 8,265 72,084 40,882 6,164 29,772 32,648 212,368 Substandard 804 82,216 131,253 112,123 68,695 27,253 3,180 27,157 451,876 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 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 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 Substandard — — 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 Auto finance: Risk rating: Pass $ — $ — $ 1,218,820 $ 952,839 $ 75,209 $ 163 $ 456 $ 132 $ 2,247,618 Special mention — — 619 1,850 205 — — — 2,674 Substandard — — — 73 — — — — 73 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 Substandard 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 $ 196,632 $ 6,419 $ 3,732 $ 2,658 $ 1,127 $ 460 $ 64,121 $ 275,149 Special mention 26 843 9 — 3 20 — 6 881 Substandard — 1,582 — — — — — — 1,582 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 $ 717,632 $ 1,579,238 $ 2,603,843 $ 2,194,529 $ 1,417,802 $ 653,584 $ 1,768,145 $ 10,934,773 Special mention 205 1,043 628 1,936 208 49 110 441 4,416 Substandard 10 1,656 500 166 — — 207 26 2,556 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 $ 2,604,690 $ 5,206,038 $ 8,093,062 $ 5,886,359 $ 2,511,435 $ 1,537,747 $ 2,556,674 $ 28,396,005 Special mention 205 23,595 8,893 74,020 41,091 6,213 29,882 33,089 216,784 Substandard 814 83,872 131,753 112,289 68,695 27,253 3,387 27,183 454,432 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 gross charge offs by origination year at December 31, 2024: Gross Charge Offs by Origination Year ($ in thousands) Rev Loans Amortized Cost Basis 2024 2023 2022 2021 2020 Prior Total Commercial and industrial $ 4,433 $ 128 $ 11,484 $ 8,510 $ 22,959 $ 3 $ — $ 47,517 Commercial real estate-owner occupied — — — — — — 3 3 Commercial and business lending 4,433 128 11,484 8,510 22,959 3 3 47,520 Commercial real estate-investor — 6,617 1 — 4,569 — — 11,187 Real estate construction — — — — — — — — Commercial real estate lending — 6,617 1 — 4,569 — — 11,187 Total commercial 4,433 6,745 11,485 8,510 27,528 3 3 58,707 Residential mortgage — — 134 125 101 153 515 1,029 Auto finance — 418 2,982 5,582 560 — — 9,541 Home equity 93 — — 9 19 10 85 216 Other consumer 6,555 20 96 75 75 42 59 6,922 Total consumer 6,649 438 3,212 5,790 755 205 659 17,709 Total gross charge offs $ 11,082 $ 7,183 $ 14,697 $ 14,300 $ 28,283 $ 209 $ 662 $ 76,415 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. Substandard 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, substandard, 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 recorded investment of consumer loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $23 million at December 31, 2024 and $16 million at December 31, 2023. The following table presents loans by past due status at December 31, 2024: Accruing ($ in thousands) Current 30-59 Days 60-89 Days 90+ Days Nonaccrual (a)(b) Total Commercial and industrial $ 10,552,756 $ 899 $ 361 $ 642 $ 19,084 $ 10,573,741 Commercial real estate - owner occupied 1,140,607 1,533 101 — 1,501 1,143,741 Commercial and business lending 11,693,363 2,432 462 642 20,585 11,717,483 Commercial real estate - investor 5,174,879 5,117 31,274 — 16,705 5,227,975 Real estate construction 1,982,581 21 — — 30 1,982,632 Commercial real estate lending 7,157,460 5,138 31,274 — 16,735 7,210,607 Total commercial 18,850,823 7,570 31,736 642 37,320 18,928,090 Residential mortgage 6,962,610 14,731 162 — 70,038 7,047,541 Auto finance 2,787,967 12,588 2,262 — 7,402 2,810,220 Home equity 651,248 4,181 445 — 8,378 664,252 Other consumer 312,687 1,892 1,236 2,547 122 318,483 Total consumer 10,714,512 33,391 4,105 2,547 85,941 10,840,496 Total loans $ 29,565,335 $ 40,961 $ 35,841 $ 3,189 $ 123,260 $ 29,768,586 (a) Of the total nonaccrual loans, $52 million, or 42%, were current with respect to payment at December 31, 2024. (b) No interest income was recognized on nonaccrual loans for the year ended December 31, 2024. In addition, there were $24 million of nonaccrual loans for which there was no related ACLL at December 31, 2024. The following table presents loans by past due status at December 31, 2023: Accruing ($ 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 $23 million of nonaccrual loans for which there was no related ACLL at December 31, 2023. Loan Modifications and Troubled Debt Restructurings The following tables show the composition of loan modifications made to borrowers experiencing financial difficulty by the loan portfolio and type of concessions granted. Each of the types of concessions granted comprised less than 1% of their respective classes of loan portfolios at both December 31, 2024 and December 31, 2023. Interest Rate Concession Amortized Cost Twelve Months Ended December 31, ($ in thousands) 2024 2023 Commercial and industrial $ 475 $ 306 Residential mortgage 295 — Auto finance 10 255 Home equity — 77 Other consumer 2,239 1,449 Total loans modified $ 3,019 $ 2,087 Term Extension Amortized Cost Twelve Months Ended December 31, ($ in thousands) 2024 2023 Residential mortgage $ — $ 208 Home equity — 25 Total loans modified $ — $ 233 Combination - Interest Rate Concession and Term Extension Amortized Cost Twelve Months Ended December 31, ($ in thousands) 2024 2023 Residential mortgage $ 2,849 $ 865 Home equity 244 339 Total loans modified $ 3,093 $ 1,204 The following tables summarize, by loan portfolio, the financial effect of the Corporation's loan modifications on the modified loans: Interest Rate Concession Financial Effect, Weighted Average Contractual Interest Rate (Decrease) Increase (a) Twelve Months Ended December 31, Loan Type 2024 2023 Commercial and industrial (18) % (19) % Residential mortgage 2 % 1 % Auto finance (7) % (9) % Home equity (3) % — % Other consumer (21) % (21) % Weighted average of total loans modified (8) % (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 Financial Effect, Weighted Average Term Increase (a) Twelve Months Ended December 31, Loan Type 2024 2023 Residential mortgage 108 months 65 months Home equity 63 months 85 months Weighted average of total loans modified 105 months 71 months (a) During the twelve months ended December 31, 2024 and December 31, 2023, term extensions changed the weighted average term on modified loans from 282 to 386 months and 175 to 245 months, respectively. 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, 2024: Payment Status (Amortized Cost Basis) ($ in thousands) Current 30-89 Days Past Due 90+ Days Past Due Commercial and industrial $ 475 $ — $ — Residential mortgage 2,355 453 336 Auto finance 5 3 2 Home equity 244 — — Other consumer 2,239 — — Total loans modified $ 5,318 $ 456 $ 338 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 Commercial and industrial $ 306 $ — $ — Residential mortgage 773 56 245 Auto finance 218 36 — Home equity 310 123 9 Other consumer 1,449 — — Total loans modified $ 3,056 $ 215 $ 253 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, 2024: Amortized Cost of Loan Modifications that Subsequently Defaulted ($ in thousands) Interest Rate Concession Term Extension Combination Interest Rate Reduction and Term Extension Residential mortgage $ — $ — $ 151 Auto finance 2 — — Home equity — — 186 Total loans modified $ 2 $ — $ 337 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 provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance at December 31, 2022, prior to the adoption of ASU 2022-02: ($ 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, prior to the adoption of ASU 2022-02: ($ 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, 2024 was the Moody's baseline scenario from November 2024, which was reviewed against the December 2024 baseline scenario with no material updates made, over a two 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 15 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, 2024: ($ in thousands) Dec 31, 2023 Charge Offs Recoveries Net Charge Offs Provision for Credit Losses Dec 31, 2024 ACLL / Loans Allowance for loan losses Commercial and industrial $ 128,263 $ (47,517) $ 2,148 $ (45,369) $ 53,703 $ 136,596 Commercial real estate — owner occupied 10,610 (3) 7 4 (1,198) 9,417 Commercial and business lending 138,873 (47,520) 2,155 (45,365) 52,505 146,013 Commercial real estate — investor 67,858 (11,187) — (11,187) 14,876 71,547 Real estate construction 53,554 — 65 65 (2,119) 51,499 Commercial real estate lending 121,412 (11,187) 65 (11,122) 12,756 123,046 Total commercial 260,285 (58,707) 2,220 (56,487) 65,262 269,060 Residential mortgage 37,808 (1,029) 280 (750) (4,483) 32,576 Auto finance 24,961 (9,541) 2,905 (6,637) 10,142 28,467 Home equity 15,403 (216) 1,366 1,150 67 16,620 Other consumer 12,638 (6,922) 1,096 (5,826) 10,012 16,824 Total consumer 90,809 (17,709) 5,647 (12,062) 15,738 94,486 Total loans $ 351,094 $ (76,415) $ 7,867 $ (68,549) $ 81,000 $ 363,545 Allowance for unfunded commitments Commercial and industrial $ 13,319 $ — $ — $ — $ 1,137 $ 14,456 Commercial real estate — owner occupied 149 — — — 2 151 Commercial and business lending 13,468 — — — 1,139 14,607 Commercial real estate — investor 480 — — — 98 578 Real estate construction 17,024 — — — 2,567 19,591 Commercial real estate lending 17,504 — — — 2,664 20,169 Total commercial 30,972 — — — 3,803 34,776 Home equity 2,629 — — — (164) 2,465 Other consumer 1,174 — — — 361 1,535 Total consumer 3,803 — — — 197 4,000 Total loans $ 34,776 $ — $ — $ — $ 4,000 $ 38,776 Allowance for credit losses on loans Commercial and industrial $ 141,582 $ (47,517) $ 2,148 $ (45,369) $ 54,840 $ 151,052 1.43 % Commercial real estate — owner occupied 10,759 (3) 7 4 (1,196) 9,568 0.84 % Commercial and business lending 152,341 (47,520) 2,155 (45,365) 53,644 160,620 1.37 % Commercial real estate — investor 68,338 (11,187) — (11,187) 14,973 72,125 1.38 % Real estate construction 70,578 — 65 65 447 71,090 3.59 % Commercial real estate lending 138,916 (11,187) 65 (11,122) 15,421 143,215 1.99 % Total commercial 291,257 (58,707) 2,220 (56,487) 69,065 303,835 1.61 % Residential mortgage 37,808 (1,029) 280 (750) (4,483) 32,576 0.46 % Auto finance 24,961 (9,541) 2,905 (6,637) 10,142 28,467 1.01 % Home equity 18,032 (216) 1,366 1,150 (97) 19,085 2.87 % Other consumer 13,812 (6,922) 1,096 (5,826) 10,373 18,359 5.76 % Total consumer 94,613 (17,709) 5,647 (12,062) 15,935 98,486 0.91 % Total loans $ 385,870 $ (76,415) $ 7,867 $ (68,549) $ 85,000 $ 402,322 1.35 % 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 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2024
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 2024, utilizing a qualitative assessment. Based on this assessment, 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 2024 impairment test that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2024, 2023, or 2022. The Corporation had goodwill of $1.1 billion at both December 31, 2024 and 2023. Core Deposit Intangibles The Corporation has CDIs which are amortized. Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows: ($ in thousands) 2024 2023 2022 Core deposit intangibles Gross carrying amount at the beginning of the year $ 88,109 $ 88,109 $ 88,109 Accumulated amortization (56,449) (47,638) (38,827) Net book value $ 31,660 $ 40,471 $ 49,282 Amortization during the year $ 8,811 $ 8,811 $ 8,811 Mortgage Servicing Rights The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. MSRs are not traded in active markets. As a result, 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, are used in measuring the fair value of the MSRs asset. These assumptions are considered significant unobservable inputs. See Note 1 for the Corporation’s accounting policy for MSRs. See Note 15 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 17 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 is as follows: ($ in thousands) 2024 2023 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 84,390 $ 77,351 Additions 6,707 3,564 Decay (8,060) (7,185) Valuation: Change in fair value model assumptions — 8,881 Changes in fair value of asset 4,646 1,778 Mortgage servicing rights at end of period $ 87,683 $ 84,390 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) (a) $ 6,285,018 $ 7,364,492 Mortgage servicing rights to servicing portfolio (a) 1.40 % 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 $844 million. After sale, the servicing was retained for a short period until full servicing was transferred to the purchaser in January 2024. The projections of amortization expense for CDIs and decay for MSRs are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2024. The actual expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. The following table shows the estimated future yearly amortization expense for CDIs and decay for MSRs: ($ in thousands) Core Deposit Intangibles Mortgage Servicing Rights 2025 $ 8,811 $ 9,767 2026 8,811 11,230 2027 8,811 11,602 2028 3,485 10,945 2029 1,681 9,767 Beyond 2029 61 34,373 Total estimated amortization expense and MSRs decay (a) $ 31,660 $ 87,683

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2024
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 the Corporation's premises and equipment is as follows: December 31, 2024 December 31, 2023 ($ in thousands) Estimated Cost Accumulated Net Book Net Book Land — $ 63,642 $ — $ 63,642 $ 63,984 Land improvements 3 – 20 years 22,911 11,533 11,379 11,250 Buildings and improvements 5 – 40 years 415,690 198,699 216,991 212,004 Computers and related equipment 4 – 8 years 60,198 50,055 10,143 10,845 Furniture, fixtures, and other equipment 3 – 20 years 116,482 91,823 24,658 35,627 Operating leases — 56,818 23,616 33,202 24,712 Leasehold improvements 2 – 20 years 46,192 27,113 19,078 14,556 Total premises and equipment $ 781,932 $ 402,840 $ 379,093 $ 372,978 Depreciation and amortization of premises and equipment totaled $29 million for 2024, $30 million for 2023, and $31 million for 2022.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
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 38 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 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) 2024 2023 2022 Operating lease costs $ 6,414 $ 6,281 $ 6,812 Finance lease costs 373 92 119 Operating lease cash flows 6,617 7,171 8,440 Finance lease cash flows 93 92 125 The right-of-use asset and lease liability by lease classifications on the consolidated balance sheets were as follows: Consolidated Balance Sheets Category ($ in thousands) December 31, 2024 December 31, 2023 Operating lease right-of-use asset Premises and equipment $ 33,202 $ 24,712 Finance lease right-of-use asset Other assets — 368 Operating lease liability Accrued expenses and other liabilities 35,596 27,311 Finance lease liability Other long-term funding 295 383 The lease payment obligations, weighted-average remaining lease term, and weighted-average original discount rate were as follows: December 31, 2024 December 31, 2023 ($ 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 $ 39,072 8.30 4.26 % $ 25,729 5.76 3.12 % Land 3,228 6.63 3.52 % 4,050 6.98 3.48 % Equipment 204 1.50 4.62 % 408 2.50 4.62 % Total operating leases $ 42,505 8.13 4.20 % $ 30,187 5.88 3.19 % Finance leases Retail and corporate offices $ 301 3.25 1.32 % $ 394 4.25 1.32 % Total finance leases $ 301 3.25 1.32 % $ 394 4.25 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 2025 $ 6,760 $ 93 $ 6,853 2026 6,228 93 6,321 2027 5,572 93 5,664 2028 4,845 23 4,868 2029 3,612 — 3,612 Beyond 2029 15,487 — 15,487 Total lease payments $ 42,505 $ 301 $ 42,806 Less: interest 6,909 6 6,915 Present value of lease payments $ 35,596 $ 295 $ 35,891 At December 31, 2024 and 2023, additional operating leases, primarily retail and corporate offices, that had not yet commenced totaled $2 million and $3 million, respectively. The leases that had not yet commenced as of December 31, 2024 will commence between January 2025 and April 2025 with lease terms of 1 year to 7 years. The Corporation conducts a portion of its business through certain facilities and equipment under non-cancelable operating leases. The Corporation also leases a subdivision of some of its facilities and receives rental income from such lease agreements, included within occupancy expense on the consolidated statements of income. The approximate minimum annual rental payments and rental receipts under non-cancelable agreements and leases are as follows: ($ in thousands) Payments Receipts 2025 $ 6,565 $ 3,628 2026 6,293 3,475 2027 5,636 3,170 2028 4,855 2,510 2029 3,604 2,454 Beyond 2029 15,650 11,493 Total $ 42,603 $ 26,730

Deposits

Deposits	12 Months Ended
	Dec. 31, 2024
Deposits [Abstract]
Deposits	Deposits The distribution of deposits is as follows: ($ in thousands) December 31, 2024 December 31, 2023 Noninterest-bearing demand $ 5,775,657 $ 6,119,956 Savings 5,133,295 4,835,701 Interest-bearing demand 9,124,741 8,843,967 Money market 6,637,915 6,330,453 Brokered CDs 4,276,309 4,447,479 Other time deposits 3,700,518 2,868,494 Total deposits $ 34,648,434 $ 33,446,049 Time deposits in excess of $250,000 were $758 million and $523 million at December 31, 2024 and 2023, respectively. Aggregate annual maturities of all time deposits at December 31, 2024, are as follows: Maturities During Year Ending December 31, ($ in thousands) 2025 $ 7,898,330 2026 47,925 2027 17,814 2028 6,204 2029 6,550 Thereafter 5 Total $ 7,976,827

Short and Long-Term Funding

Short and Long-Term Funding	12 Months Ended
	Dec. 31, 2024
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, 2024 December 31, 2023 Short-term funding Federal funds purchased $ 370,325 $ 220,160 Securities sold under agreements to repurchase 100,044 106,620 Federal funds purchased and securities sold under agreements to repurchase $ 470,369 $ 326,780 Long-term funding Corporation senior notes, at par $ 300,000 $ — Corporation subordinated notes, at par 550,000 550,000 Discount and capitalized costs (8,664) (7,748) Subordinated debt fair value hedge (a) (3,996) (1,366) Finance leases 295 383 Total long-term funding $ 837,635 $ 541,269 Total short and long-term funding, excluding FHLB advances $ 1,308,004 $ 868,049 FHLB advances Short-term FHLB advances $ 1,250,000 $ 740,000 Long-term FHLB advances 611,551 1,209,907 FHLB advances fair value hedge (a) (7,744) (9,713) Total FHLB advances $ 1,853,807 $ 1,940,194 Total short and long-term funding $ 3,161,811 $ 2,808,243 (a) For additional information on the fair value hedges, see Note 13. 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, 2024, the Corporation had pledged securities valued at 176% 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 is presented in the following table: Overnight and Continuous ($ in thousands) December 31, 2024 December 31, 2023 Repurchase agreements Agency mortgage-related securities $ 100,044 $ 106,620 Long-Term Funding Senior Notes In August 2024, the Corporation issued $300 million in aggregate principal amount of 6.455% Fixed Rate / Floating Rate Senior Notes Due August 29, 2030. Up to, but excluding, August 29, 2024, to, but excluding, August 29, 2029, the senior notes will have a fixed coupon interest rate of 6.455% per annum, payable semi-annually in arrears. During the period from, and including, August 29, 2029, to, but excluding, the maturity date, the senior notes will have a floating rate per annum equal to Compounded SOFR (as defined in the Global Note issued in connection with the senior notes) plus 3.030%, payable quarterly in arrears. Prior to August 29, 2029, the Corporation may, at its option, redeem the senior notes, in whole or in part, at any time and from time to time, by paying the aggregate principal amount of the notes to be redeemed plus a "make whole" premium plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. On August 29, 2029, the Corporation may redeem the senior notes, in whole, but not in part, by paying the aggregate principal amount of the notes to be redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. At any time and from time to time on or after July 30, 2030 (30 days prior to the maturity date), the Corporation may redeem the senior notes in whole or in part by paying the aggregate principal amount of the senior notes to be redeemed plus accrued and unpaid interest thereon, if any, to, but excluding, the redemption date. The senior notes were issued at a discount. Subordinated Notes 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. 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. Finance Leases Finance leases are used in conjunction with branch operations. See Note 6 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 loans, residential mortgage loans held for sale, home equity loans, CRE loans, and investment securities). At December 31, 2024, the Corporation had $10.9 billion of total collateral capacity, primarily supported by pledged consumer and CRE loans and investment securities. At December 31, 2024, the FHLB advances had maturity or call dates ranging from 2025 through 2031, and had a weighted average interest rate of 3.77%, compared to 4.93% at December 31, 2023. The Corporation prepaid $600 million in long-term FHLB advances during the fourth quarter of 2024, incurring a prepayment fee of $14 million . The table below summarizes the expected maturities of the Corporation’s long-term funding at December 31, 2024: ($ in thousands) Long Term Funding Year 2025 $ 648,841 2026 4,504 2027 510 2028 196,487 2029 3,235 Beyond 2029 587,865 Total long-term funding $ 1,441,442

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Preferred Equity: 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. Common Stock Issuance: On November 18, 2024, the Corporation completed its underwritten public offering of 13.8 million shares of common stock at a price to the public of $25.00 per share. The net proceeds to the Company from the offering were $331 million, after deducting underwriting discounts, commissions, and offering expenses payable by the Corporation. Subsidiary Equity: At December 31, 2024, subsidiary equity equaled $4.5 billion. See Note 18 for additional information on regulatory requirements for the Bank. Common Stock Repurchases: In 2024, the Board of Directors did not approve any additional authorizations for the repurchase of the Corporation's common stock. During 2024, the Corporation repurchased 900,000 shares for $18 million (or an average cost per common share of $20.32), and did not repurchase any shares in 2023 under the share repurchase program. As of December 31, 2024, $61 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 $6 million (302,077 shares at an average cost per common share of $20.64) during 2024, compared to $7 million (297,564 shares at an average cost per common share of $22.16) during 2023. Other Comprehensive Income (Loss): See the Consolidated Statements of Comprehensive Income for a summary of activity in other comprehensive income (loss) and see Note 21 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, 2024
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. As of December 31, 2024, approximately 5.2 million shares remained available for grant under the 2020 Plan. 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 one or more performance measures as selected by the Compensation & Benefits Committee in its discretion, and service-based awards are contingent upon continued employment or meeting the requirements for retirement. Performance-based restricted stock awards granted during 2023 and 2024 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 2020 Plan, expenses related to 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, 2024 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Aggregate Intrinsic Value (a) Outstanding at December 31, 2023 3,792 $ 21.25 4.26 years $ 5,834 Exercised 1,923 20.06 Forfeited or expired 91 24.85 Outstanding at December 31, 2024 1,778 $ 22.36 3.41 years $ 3,693 Options exercisable at December 31, 2024 1,778 $ 22.36 3.41 years $ 3,693 (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, 2024, 2023, and 2022, the intrinsic value of stock options exercised was $10 million, approximately $518,000, and $4 million, respectively. The total fair value of stock options that vested was approximately $489,000 for the year ended December 31, 2024, approximately $943,000 for the year ended December 31, 2023, and $2 million for the year ended December 31, 2022. The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2024: Restricted Stock Shares (a) Weighted Average Outstanding at December 31, 2023 2,349 $ 21.20 Granted 837 20.76 Vested 790 23.64 Forfeited 87 21.96 Outstanding at December 31, 2024 2,310 $ 21.25 (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 $19 million was recorded for the year ended December 31, 2024, $17 million for the year ended December 31, 2023, and $16 million for the year ended December 31, 2022. Included in compensation expense for 2024 was $5 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $18 million of unrecognized compensation costs related to restricted stock awards at December 31, 2024 that are expected to be recognized over the remaining requisite service periods that extend predominantly through the first quarter of 2028. 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 9, 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.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
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) 2024 2023 2022 Current Federal $ 38,353 $ 29,319 $ 58,982 State 9,436 5,283 22,092 Total current 47,789 34,602 81,074 Deferred Federal (30,701) (8,371) 12,531 State (5,775) (3,135) (97) Total deferred (36,475) (11,506) 12,434 Total income tax expense $ 11,314 $ 23,097 $ 93,508 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, included in other assets and accrued expenses and other liabilities on the consolidated balance sheets, respectively, were as follows: ($ in thousands) December 31, 2024 December 31, 2023 Deferred tax assets Allowance for loan losses $ 89,295 $ 83,378 Allowance for other losses 9,840 8,933 Accrued liabilities 26,109 14,089 Deferred compensation 30,404 28,429 Federal tax credits carryforward 18,160 8,849 Benefit of state tax losses and credit carryforwards 4,187 9,068 Capital loss 29,325 — Nonaccrual interest 1,269 901 Partnerships 37,781 2,365 Lease liability 8,881 6,785 Net unrealized losses on AFS securities 16,228 48,632 Net unrealized losses on pension and postretirement benefits 7,995 8,506 Other 3,353 9,403 Total deferred tax assets $ 282,828 $ 229,338 Valuation allowance for deferred tax assets (32,702) — Total deferred tax assets after valuation allowance $ 250,126 $ 229,338 Deferred tax liabilities Prepaid expenses $ 83,251 $ 66,381 Goodwill 22,376 22,161 Mortgage banking activities 21,877 20,799 Deferred loan fee income 7,836 8,097 State deferred taxes — 1,387 Lease financing 13,213 15,297 Bank premises and equipment 30,534 20,389 Purchase accounting 6,246 7,898 Basis difference from equity securities and other investments 3,104 7,593 Other — 1,207 Total deferred tax liabilities $ 188,437 $ 171,209 Net deferred tax assets $ 61,689 $ 58,129 At December 31, 2024, the valuation allowance for DTAs was related to capital loss carryovers. The changes in the valuation allowance were as follows: ($ in thousands) 2024 2023 Valuation allowance for deferred tax assets, beginning of year $ — $ — (Increase) in current year (32,702) — Valuation allowance for deferred tax assets, end of year $ (32,702) $ — At December 31, 2024, the Corporation had state net operating loss carryforwards of $117 million (of which $2 million was acquired from various acquisitions) that will begin expiring in 2025. The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows: 2024 2023 2022 Federal income tax rate at statutory rate 21.0 % 21.0 % 21.0 % Increases (decreases) resulting from: Tax-exempt interest and dividends (10.6) % (7.4) % (3.4) % State income taxes (net of federal benefit) 2.2 % 0.3 % 4.2 % Bank owned life insurance (2.1) % (1.1) % (0.5) % Tax effect of tax credits and benefits, net of related expenses (7.9) % (4.7) % (1.6) % Net tax (benefit) from stock-based compensation (0.2) % — % (0.2) % Net tax (benefit) of portfolio reallocation and legal entity rationalization plan (a) (25.7) % — % — % Changes in valuation allowance 24.3 % — % — % FDIC premium 4.8 % 3.0 % 0.7 % Other nondeductible expenses 2.3 % — % — % Changes in unrecognized tax benefits 0.4 % — % — % Prior year return to provision (0.5) % — % — % Other 0.4 % 0.1 % 0.1 % Effective income tax rate 8.4 % 11.2 % 20.3 % (a) Related to the previously announced strategic reallocation of the investment portfolio and adoption of a legal entity rationalization plan in the second quarter of 2024. 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, 2024. If income taxes had been provided, the deferred tax liability would have been approximately $25 million. Management does not expect this amount to become taxable in the future; therefore, no provision for income taxes has been made. The Corporation and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Corporation’s federal income tax returns are open and subject to examination from the 2021 tax return year and forward. The years open to examination by state and local government authorities varies by jurisdiction. A reconciliation of the beginning and ending amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was as f ollows: ($ in thousands) 2024 2023 Balance at beginning of year $ 2,227 $ 2,233 Changes for tax positions related to prior years 83 (441) Changes for tax positions related to current year 462 435 Balance at end of year $ 2,772 $ 2,227 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, 2024 and 2023. At December 31, 2024 and 2023, 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, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivative and Hedging Activities The Corporation enters into derivative financial instruments to manage exposures that arise from business activities that result in the payment of future known and uncertain cash amounts, the values of which are determined by interest and currency rates as well as other economic conditions. 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 $81 million and $93 million of investment securities as collateral at December 31, 2024, and 2023, respectively. Cash is often pledged as collateral for derivatives that are not centrally cleared. The Corporation's required cash collateral was immaterial at December 31, 2024, compared to $5 million at December 31, 2023. See Note 17 for fair value information and disclosures and see Note 1 for the Corporation's accounting policy for derivative and hedging activities. Fair Value Hedges 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 The Corporation's objectives in using interest rate derivatives are to add stability to interest income and to manage its exposure to interest rate movements. To accomplish this objective, the Corporation uses interest rate swaps as part of its interest rate risk management strategy. 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. Non-Designated Hedges Derivatives to Accommodate Customer Needs Derivatives not designated as hedges may be used to manage the Corporation's exposure to interest or foreign exchange rate movements, or to provide a service to customers, but do not meet the requirements for hedge accounting under U.S. GAAP. Derivatives not designated as hedges are not entered into for speculative purposes. The Corporation executes interest rate swaps or forward currency exchange forwards with commercial lending customers to facilitate their respective risk management strategies. These derivative contracts with customers are simultaneously offset by derivative contracts that the Corporation executes with a third party, such that the Corporation minimizes its net risk exposure resulting from such transactions. As these interest rate swaps and foreign currency exchange forwards do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings in capital markets, net. 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. 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, 2024 and December 31, 2023. 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, 2024 and December 31, 2023. 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, 2024 December 31, 2023 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 (a) $ 1,950,000 $ 2,960 $ 1,150,000 $ 2,976 $ 2,300,000 $ 8,075 $ 550,000 $ 930 Foreign currency exchange forwards 127,518 2,457 216,665 563 231,566 632 189,212 2,946 Total designated as hedging instruments 5,418 3,539 8,707 3,876 Not designated as hedging instruments: Interest rate-related and other instruments 3,858,867 88,541 6,992,894 170,928 3,603,513 111,623 6,528,471 195,662 Foreign currency exchange forwards 68,028 4,315 74,199 4,106 87,526 2,954 135,654 2,746 Mortgage banking (b)(c) 28,580 580 85,000 — 29,490 439 51,500 673 Total not designated as hedging instruments 93,436 175,034 115,016 199,082 Gross derivatives before netting 98,854 178,573 123,723 202,958 Less: Legally enforceable master netting agreements 12,667 12,667 18,234 18,234 Less: Cash collateral pledged/received 35,190 250 35,855 — Total derivative instruments, after netting $ 50,997 $ 165,656 $ 69,634 $ 184,724 (a) The notional amounts of the interest rate-related instruments designated as hedging instruments include forward starting interest rate swaps with an effective date ranging from February 1, 2025 to March 1, 2025. The asset notional amount and fair value on such swaps were $100 million and approximately $333,000, respectively. The liability notional amount and fair value on such swaps were $300 million and $1 million, respectively. (b) 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. (c) At December 31, 2024, the mortgage derivative asset included approximately $254,000 of forward commitments fair value. The following table presents amounts that were recorded on the consolidated balance sheets related to cumulative basis adjustments for fair value hedges: Line Item in the Consolidated Balance Sheets in Which the Hedged Item is Included Carrying Amount of the Hedged Assets/(Liabilities) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Carrying Amount of the Hedged Assets/(Liabilities) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) ($ in thousands) December 31, 2024 December 31, 2023 Other long-term funding $ (296,004) $ 3,996 $ (548,634) $ 1,366 FHLB Advances (592,256) 7,744 (590,287) 9,713 Total $ (888,260) $ 11,740 $ (1,138,921) $ 11,079 (a) Excludes hedged items where only foreign currency risk is the designated hedged risk. At December 31, 2024 and 2023, the carrying amount excluded for foreign currency denominated loans was $344 million and $421 million, respectively. The Corporation terminated its $500 million fair value hedge during the fourth quarter of 2019. At December 31, 2024, the amortized cost basis of the closed portfolios which had previously been used in the terminated hedging relationship was $219 million and is included in loans on the consolidated balance sheets. This amount includes approximately $839,000 of hedging adjustments on the discontinued hedging relationships, which are not presented in the table above. The tables below identify the effect of fair value and cash flow hedge accounting on the Corporation's consolidated statements of income: Location and Amount Recognized on the Consolidated Statements of Income in Fair Value and Cash Flow Hedging Relationships For the Years Ended December 31, 2024 2023 2022 ($ in thousands) Interest Income Interest Expense Interest Income Interest Expense Loss on Mortgage Portfolio Sale Interest Income Interest Expense 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) $ (16,695) $ 19,189 $ (14,176) $ 17,536 $ (125) $ (263) $ 334 The effects of fair value and cash flow hedging: Impact on fair value hedging relationships in Subtopic 815-20 Interest contracts: Hedged items (217) (661) (245) 5,084 (125) (529) (16,163) Derivatives designated as hedging instruments (a) (16,478) 19,850 (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, 2024 2023 2022 ($ 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 $ (3) $ — $ (9) The effects of fair value hedging: Impact on fair value hedging relationships in Subtopic 815-20 Foreign currency contracts: Hedged items (31,226) 9,322 (26,686) Derivatives designated as hedging instruments 31,223 (9,322) 26,677 The following table presents the effect of cash flow hedge accounting on accumulated other comprehensive income (loss): For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Interest rate-related instruments designated as cash flow hedging instruments Amount of (loss) income recognized in OCI on cash flow hedge derivative (a) $ (21,537) $ (13,254) $ 3,626 Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest income (a) 16,478 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 $1 million will be reclassified as a decrease to interest income over the next 12 months. This amount could differ from amounts actually recognized due to changes in interest rates, hedge de-designations, or the addition of other hedges subsequent to December 31, 2024. The maximum length of time over which the Corporation is hedging its exposure to the variability in future cash flows is 36 months as of December 31, 2024. The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income: Consolidated Statements of Income Category of For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Derivative Instruments Interest rate-related and other instruments — customer and mirror, net Capital markets, net $ (133) $ 392 $ 515 Interest rate-related instruments — MSRs hedge Mortgage banking, net (6,531) (1,096) (12,622) Foreign currency exchange forwards Capital markets, net (371) 1,670 203 Commodity contracts Capital markets, net — — (16) Interest rate lock commitments (mortgage) Mortgage banking, net (113) 353 (2,531) Forward commitments (mortgage) Mortgage banking, net 927 (627) (123)

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 2024
Offsetting [Abstract]
Additional Financial Information Disclosure [Text Block]	Balance Sheet Offsetting Interest Rate-Related Instruments and Foreign Exchange Forwards (“Interest and Foreign Exchange Agreements”) The Corporation is permitted to present derivative receivables and derivative payables with the same counterparty and the related cash collateral receivables and payables on a net basis on the consolidated balance sheets when a legally enforceable master netting agreement exists. The Corporation has elected to net such balances where it has determined that the specified conditions are met. The Corporation uses master netting agreements to mitigate counterparty credit risk in these transactions, including derivative contracts. A master netting agreement is a single agreement with a counterparty that permits multiple transactions governed by that agreement to be terminated or accelerated and settled through a single payment in a single currency in the event of a default (e.g., bankruptcy, failure to make a required payment or securities transfer, or failure to deliver collateral or margin when due). Typical master netting agreements for these types of transactions also often contain a collateral/margin agreement that provides for a security interest in, or title transfer of, securities or cash collateral/margin to the party that has the right to demand margin (the "demanding party"). The collateral/margin agreement typically requires a party to transfer collateral/margin to the demanding party with a value equal to the amount of the margin deficit on a net basis across all transactions governed by the master netting agreement, less any threshold. The collateral/margin agreement grants to the demanding party, upon default by the counterparty, the right to offset any amounts payable by the counterparty against any posted collateral or the cash equivalent of any posted collateral/margin. It also grants to the demanding party the right to liquidate collateral/margin and to apply the proceeds to an amount payable by the counterparty. See Note 13 for additional information on the Corporation’s derivative and hedging activities. The following tables present the interest rate and foreign exchange assets and liabilities subject to an enforceable master netting arrangement. 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 these tables: 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, 2024 $ 79,807 $ (12,667) $ (35,190) $ 31,950 $ (31,950) $ — December 31, 2023 87,075 (18,234) (35,855) 32,985 (32,985) — 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, 2024 $ 14,369 $ (12,667) $ (250) $ 1,452 $ — $ 1,452 December 31, 2023 18,767 (18,234) — 533 — 533

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	12 Months Ended
	Dec. 31, 2024
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 13). The following is a summary of lending-related commitments: ($ in thousands) December 31, 2024 December 31, 2023 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 11,173,438 $ 11,170,147 Commercial letters of credit (a) 875 3,697 Standby letters of credit (c) 253,709 212,029 (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, 2024 or 2023. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 13. (c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $3 million and $2 million at December 31, 2024 and 2023, respectively, as an estimate of the fair value of these financial instruments. Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in thousands) Year Ended December 31, 2024 Year Ended December 31, 2023 Allowance for unfunded commitments Balance at beginning of period $ 34,776 $ 38,776 Provision for unfunded commitments 4,000 (4,000) Balance at end of period $ 38,776 $ 34,776 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 13. 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, 2024, was $205 million, compared to $219 million at December 31, 2023, included in tax credit and other investments on the consolidated balance sheets. Under the proportional amortization method, the Corporation amortizes the initial cost of qualified, eligible investments 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, eligible investments of $35 million, $34 million, and $34 million during the years ended December 31, 2024, 2023, and 2022, respectively. The Corporation's remaining investment in qualified, eligible investments accounted for under the proportional amortization method totaled $203 million at December 31, 2024 and $215 million at December 31, 2023. 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 $30 million and $27 million at December 31, 2024 and 2023, respectively. Additionally, at December 31, 2024, the Corporation also invests in a private loan fund, recorded in equity securities on the consolidated balance sheets, which has a remaining unfunded equity contribution of $3 million. During the years ended December 31, 2024, 2023 and 2022, 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 $54 million and $40 million at December 31, 2024 and 2023, 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. 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 $3 million and $5 million for the years ended December 31, 2024 and 2023, respectively. There were no loss reimbursement and settlement claims paid for the years ended December 31, 2024, or 2023. Make whole requests since January 1, 2023 generally arose from loans originated since January 1, 2021 with such balances totaling $4.4 billion at the time of sale, consisting primarily of loans sold to GSEs. As of December 31, 2024, $2.6 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 $553,000 at December 31, 2024 and approximately $835,000 at December 31, 2023. 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, 2024 and December 31, 2023, there were $14 million and $15 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 Mortgage Partnership Finance Traditional program in exchange for a monthly credit enhancement fee. At December 31, 2024 and December 31, 2023, there were $134 million and $16 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, 2024
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) 2024 2023 Assets Cash and due from banks $ 36,158 $ 22,473 Interest-bearing deposits in other financial institutions 212,943 20,428 Notes and interest receivable from subsidiaries 710,126 562,640 Investments in and receivable due from subsidiaries 4,455,525 4,080,536 Other assets 57,649 48,589 Total assets $ 5,472,402 $ 4,734,666 Liabilities and Stockholders' Equity Senior notes, at par $ 300,000 $ — Subordinated notes, at par 550,000 550,000 Long-term funding capitalized costs and fair value hedge liability (12,660) (9,114) Total long-term funding 837,340 540,886 Accrued expenses and other liabilities 29,500 19,807 Total liabilities 866,841 560,693 Preferred equity 194,112 194,112 Common equity 4,411,450 3,979,861 Total stockholders’ equity 4,605,562 4,173,973 Total liabilities and stockholders’ equity $ 5,472,402 $ 4,734,666 Statements of Income For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Income Income from subsidiaries $ 129,224 $ 192,559 $ 373,581 Interest income on notes receivable from subsidiaries 42,834 30,363 5,632 Other income 1,310 1,175 1,262 Total income 173,368 224,097 380,475 Expense Interest expense on short and long-term funding 45,781 36,081 10,655 Other expense 6,727 7,352 6,118 Total expense 52,508 43,434 16,772 Income before income tax expense 120,860 180,663 363,702 Income tax (benefit) (2,286) (2,292) (2,420) Net income 123,145 182,956 366,122 Preferred stock dividends 11,500 11,500 11,500 Net income available to common equity $ 111,645 $ 171,456 $ 354,622 Statements of Cash Flows For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Cash Flows from Operating Activities Net income $ 123,145 $ 182,956 $ 366,122 Adjustments to reconcile net income to net cash provided by operating activities: Decrease (increase) in equity in undistributed net income (loss) of subsidiaries 55,776 107,441 (343,582) Net change in other assets and accrued expenses and other liabilities 12,059 (35,863) 14,159 Net cash provided by operating activities 190,980 254,534 36,699 Cash Flows from Investing Activities Net (increase) in investment in subsidiary (331,023) — — Net (increase) decrease in notes receivable from subsidiaries (145,000) (385,000) 115,000 Net cash (used in) provided by investing activities (476,023) (385,000) 115,000 Cash Flows from Financing Activities Net (decrease) in commercial paper — (20,798) (13,932) Proceeds from issuance of long-term funding 297,864 292,740 — Proceeds from issuance of common stock 331,023 — — Proceeds from issuance of common stock for stock-based compensation plans 37,576 4,297 11,061 Purchase of treasury stock, open market purchases (18,289) — — Purchase of treasury stock, stock-based compensation plans (6,234) (6,593) (6,480) Cash dividends on common stock (139,197) (129,534) (123,137) Cash dividends on preferred stock (11,500) (11,500) (11,500) Other — — (938) Net cash provided by (used in) financing activities 491,243 128,612 (144,928) Net increase (decrease) in cash and cash equivalents 206,200 (1,854) 6,771 Cash and cash equivalents at beginning of year 42,901 44,755 37,984 Cash and cash equivalents at end of year $ 249,101 $ 42,901 $ 44,755

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2024
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 2 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 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 2 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. As of December 31, 2024, this balance also includes residential mortgages included in the mortgage portfolio sale as part of the balance sheet repositioning announced in the fourth quarter of 2024. 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 13 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, 2024 and 2023, 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 13 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, 2024, 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 4 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 13 for additional disclosure regarding the Corporation’s mortgage derivatives. The tables below present the Corporation’s financial instruments measured at fair value on a recurring basis and carrying amounts and estimated fair values of certain financial instruments, aggregated by the level in the fair value hierarchy within which those measurements fall: December 31, 2024 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Assets Cash and due from banks $ 544,059 $ 544,059 $ 544,059 $ — $ — Interest-bearing deposits in other financial institutions 453,590 453,590 453,590 — — Federal funds sold and securities purchased under agreements to resell 21,955 21,955 21,955 — — AFS investment securities: Obligations of state and political subdivisions (municipal securities) 3,005 3,005 — 3,005 — Residential mortgage-related securities: FNMA / FHLMC 110,928 110,928 — 110,928 — GNMA 4,227,727 4,227,727 — 4,227,727 — Commercial mortgage-related securities: FNMA / FHLMC 17,000 17,000 — 17,000 — GNMA 111,475 111,475 — 111,475 — Asset backed securities: FFELP 107,839 107,839 — 107,839 — SBA 471 471 — 471 — Other debt securities 2,989 2,989 — 2,989 — Total AFS investment securities 4,581,434 4,581,434 — 4,581,434 — HTM investment securities: U.S. Treasury securities 1,000 999 999 — — Obligations of state and political subdivisions (municipal securities), net 1,659,662 1,486,582 — 1,486,582 — Residential mortgage-related securities: FNMA / FHLMC 885,476 721,946 — 721,946 — GNMA 43,693 39,927 — 39,927 — Private-label 324,182 266,353 — 266,353 — Commercial mortgage-related securities: FNMA / FHLMC 772,456 623,595 — 623,595 — GNMA 52,219 46,032 — 46,032 — Total HTM investment securities, net 3,738,687 3,185,434 999 3,184,435 — Equity securities: Equity securities 10,742 10,742 10,670 — 72 Equity securities at NAV 12,500 12,500 Total equity securities 23,242 23,242 FHLB and Federal Reserve Bank stocks 179,665 179,665 — 179,665 — Residential loans held for sale 646,687 646,687 — 646,687 — Commercial loans held for sale 32,634 32,634 — 32,634 — Loans, net 29,373,557 28,327,115 — — 28,327,115 Bank and corporate owned life insurance 689,000 689,000 — 689,000 — Mortgage servicing rights, net 87,683 87,683 — — 87,683 Interest rate-related instruments designated as hedging instruments (a) 2,960 2,960 — 2,960 — Foreign currency exchange forwards designated as hedging instruments (a) 2,457 2,457 — 2,457 — Interest rate-related and other instruments not designated as hedging instruments (a) 88,541 88,541 — 88,541 — Foreign currency exchange forwards not designated as hedging instruments (a) 4,315 4,315 — 4,315 — Interest rate lock commitments to originate residential mortgage loans held for sale 327 327 — — 327 Forward commitments to sell residential mortgage loans 254 254 — — 254 Total selected assets at fair value $ 40,471,048 $ 38,871,352 $ 1,031,273 $ 9,412,129 $ 28,415,450 (a) Figures are presented gross before netting. See Note 13 and Note 14 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. December 31, 2024 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Liabilities Deposits: Noninterest-bearing demand $ 5,775,657 $ 5,775,657 $ — $ — $ 5,775,657 Savings 5,133,295 5,133,295 — — 5,133,295 Interest-bearing demand 9,124,741 9,124,741 — — 9,124,741 Money market 6,637,915 6,637,915 — — 6,637,915 Brokered CDs (a) 4,276,309 4,276,309 — 4,276,309 — Other time deposits (a) 3,700,518 3,700,518 — 3,700,518 — Total deposits 34,648,434 34,648,434 — 7,976,827 26,671,607 Federal funds purchased and securities sold under agreements to repurchase 470,369 470,370 — 470,370 — FHLB advances 1,853,807 1,852,685 — 1,852,685 — Other long-term funding 837,635 823,991 — 823,991 — Standby letters of credit (b) 2,546 2,546 — 2,546 — Interest rate-related instruments designated as hedging instruments (c) 2,976 2,976 — 2,976 — Foreign currency exchange forwards designated as hedging instruments (c) 563 563 — 563 — Interest rate-related and other instruments not designated as hedging instruments (c) 170,928 170,928 — 170,928 — Foreign currency exchange forwards not designated as hedging instruments (c) 4,106 4,106 — 4,106 — Total selected liabilities at fair value $ 37,991,364 $ 37,976,599 $ — $ 11,304,992 $ 26,671,607 (a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The commitment on standby letters of credit was $254 million at December 31, 2024. See Note 15 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (c) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place. December 31, 2023 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Assets Cash and due from banks $ 484,384 $ 484,384 $ 484,384 $ — $ — Interest-bearing deposits in other financial institutions 425,089 425,089 425,089 — — Federal funds sold and securities purchased under agreements to resell 14,350 14,350 14,350 — — AFS investment securities: U.S. Treasury securities 35,902 35,902 35,902 — — Obligations of state and political subdivisions (municipal securities) 91,817 91,817 — 91,817 — Residential mortgage-related securities: FNMA / FHLMC 1,120,794 1,120,794 — 1,120,794 — GNMA 2,042,675 2,042,675 — 2,042,675 — Commercial mortgage-related securities: FNMA / FHLMC 16,937 16,937 — 16,937 — GNMA 154,793 154,793 — 154,793 — Asset backed securities: FFELP 133,975 133,975 — 133,975 — SBA 1,051 1,051 — 1,051 — Other debt securities 2,950 2,950 — 2,950 — Total AFS investment securities 3,600,892 3,600,892 35,902 3,564,990 — HTM investment securities: U.S. Treasury securities 999 963 963 — — Obligations of state and political subdivisions (municipal securities), net 1,682,398 1,553,984 — 1,553,984 — Residential mortgage-related securities: FNMA / FHLMC 941,973 804,393 — 804,393 — GNMA 48,979 46,170 — 46,170 — Private-label 345,083 289,507 — 289,507 — Commercial mortgage-related securities: FNMA / FHLMC 780,995 632,914 — 632,914 — GNMA 59,733 52,619 — 52,619 — Total HTM investment securities, net 3,860,160 3,380,550 963 3,379,586 — Equity securities: Equity securities 31,651 31,651 6,883 — 24,769 Equity securities at NAV 10,000 10,000 Total equity securities 41,651 41,651 FHLB and Federal Reserve Bank stocks 229,171 229,171 — 229,171 — Residential loans held for sale 33,011 33,011 — 33,011 — Commercial loans held for sale 90,303 90,303 — 90,303 — Loans, net 28,865,124 27,371,086 — — 27,371,086 Bank and corporate owned life insurance 682,649 682,649 — 682,649 — Mortgage servicing rights, net 84,390 84,390 — — 84,390 Interest rate-related instruments designated as hedging instruments (a) 8,075 8,075 — 8,075 — Foreign currency exchange forwards designated as hedging instruments (a) 632 632 — 632 — Interest rate-related and other instruments not designated as hedging instruments (a) 111,623 111,623 — 111,623 — Foreign currency exchange forwards not designated as hedging instruments (a) 2,954 2,954 — 2,954 — Interest rate lock commitments to originate residential mortgage loans held for sale 439 439 — — 439 Total selected assets at fair value $ 38,534,897 $ 36,561,249 $ 967,570 $ 8,102,995 $ 27,480,684 (a) Figures are presented gross before netting. See Note 13 and Note 14 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. December 31, 2023 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Liabilities Deposits: Noninterest-bearing demand $ 6,119,956 $ 6,119,956 $ — $ — $ 6,119,956 Savings 4,835,701 4,835,701 — — 4,835,701 Interest-bearing demand 8,843,967 8,843,967 — — 8,843,967 Money market 6,330,453 6,330,453 — — 6,330,453 Brokered CDs (a) 4,447,479 4,447,479 — 4,447,479 — Other time deposits (a) 2,868,494 2,868,494 — 2,868,494 — Total deposits 33,446,049 33,446,049 — 7,315,973 26,130,076 Federal funds purchased and securities sold under agreements to repurchase 326,780 326,757 — 326,757 — FHLB advances 1,940,194 1,944,600 — 1,944,600 — Other long-term funding 541,269 534,983 — 534,983 — Standby letters of credit (b) 2,157 2,157 — 2,157 — Interest rate-related instruments designated as hedging instruments (c) 930 930 — 930 — Foreign currency exchange forwards designated as hedging instruments (c) 2,946 2,946 — 2,946 — Interest rate-related and other instruments not designated as hedging instruments (c) 195,662 195,662 — 195,662 — Foreign currency exchange forwards not designated as hedging instruments (c) 2,746 2,746 — 2,746 — Forward commitments to sell residential mortgage loans 673 673 — — 673 Total selected liabilities at fair value $ 36,459,407 $ 36,457,504 $ — $ 10,326,755 $ 26,130,749 (a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The commitment on standby letters of credit was $212 million at December 31, 2023. See Note 15 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (c) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place. The table below presents a rollforward of the consolidated balance sheets amounts for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ 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, 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) New production $ 11,771 $ (4,000) $ 15,771 Closed loans / settlements (8,816) 3,512 (12,328) Other (3,068) (438) (2,630) Change in mortgage derivative (113) (927) 814 Balance December 31, 2024 $ 327 $ (254) $ 580 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, 2024, 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 $500,000 is in nonaccrual status or, prior to 2023, when a commercial or consumer loan relationship had its terms restructured in a TDR or when a loan met the Corporation's definition of a probable TDR. On January 1, 2023, the Corporation adopted ASU 2022-02 prospectively. As a result, loans that were restructured prior to adoption are no longer considered TDRs and are not individually evaluated. See Note 3 for additional information regarding the Corporation’s individually evaluated loans. Equity Securities Without Readily Determinable Fair Values: The Corporation measures equity securities without readily determinable fair values at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer, with such changes recognized in earnings. Included in equity securities without readily determinable fair values were Visa Class B restricted shares carried at fair value, of which the Corporation sold all remaining shares during the first quarter of 2024. In its determination of the new carrying values upon observable price changes, the Corporation will adjust the prices if deemed necessary to arrive at the Corporation's estimated fair values. Such adjustments may include adjustments to reflect the different rights and obligations of similar securities and other adjustments. See Note 2 for additional disclosure regarding the Corporation’s equity securities without readily determinable fair values. The following table presents a rollforward of the fair value of Level 3 equity securities that are measured under the measurement alternative, and the related adjustments recorded during the periods presented for those securities with observable price changes: ($ in thousands) Fair value as of December 31, 2022 $ 19,225 Gains recognized in investment securities gains, net 5,861 Purchases 11 Sales (329) Fair value as of December 31, 2023 $ 24,769 Gains recognized in investment securities gains, net $ 4,054 Purchases 22 Sales (28,772) Fair value as of December 31, 2024 $ 72 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, 2024 Assets Individually evaluated loans Level 3 $ 31,483 Provision for credit losses $ 17,454 OREO (b) Level 2 276 Other noninterest expense / provision for credit losses (c) 1,067 December 31, 2023 Assets Individually evaluated loans Level 3 $ 47,221 Provision for credit losses $ 45,709 OREO (b) Level 2 3,139 Other noninterest expense / provision for credit losses (c) 2,532 Equity securities without readily determinable fair values Level 3 24,671 Investment securities gains (losses), net 5,785 (a) Includes the full year impact on the consolidated statements of income. (b) 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. (c) 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. The table below presents the unobservable inputs that are readily quantifiable pertaining to Level 3 measurements: December 31, 2024 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Option adjusted spread 5% - 8% 5% Mortgage servicing rights Discounted cash flow Constant prepayment rate —% - 100% 4% Individually evaluated loans Appraisals / discounted cash flow Collateral / discount factor —% - 77% 61% Interest rate lock commitments to originate residential mortgage loans held for sale Discounted cash flow Closing ratio 55% - 100% 92%

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2024
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, 2024 and 2023, 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, 2024 and 2023, 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 2024 or 2023. 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 , 2024 Associated Banc-Corp Total capital $ 4,282,597 12.61 % $ 2,716,014 ≥ 8.00 % Tier 1 capital 3,590,948 10.58 % 2,037,010 ≥ 6.00 % CET1 3,396,836 10.01 % 1,527,758 ≥ 4.50 % Leverage 3,590,948 8.73 % 1,644,627 ≥ 4.00 % Associated Bank, N.A. Total capital $ 4,078,042 12.03 % $ 2,710,815 ≥ 8.00 % $ 3,388,519 ≥ 10.00 % Tier 1 capital 3,425,721 10.11 % 2,033,111 ≥ 6.00 % 2,710,815 ≥ 8.00 % CET1 3,425,721 10.11 % 1,524,833 ≥ 4.50 % 2,202,537 ≥ 6.50 % Leverage 3,425,721 8.34 % 1,642,484 ≥ 4.00 % 2,053,105 ≥ 5.00 % 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 % (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, 2024
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) 2024 2023 2022 Net income $ 123,145 $ 182,956 $ 366,122 Preferred stock dividends (11,500) (11,500) (11,500) Net income available to common equity $ 111,645 $ 171,456 $ 354,622 Common shareholder dividends $ (138,508) $ (128,748) $ (122,417) Unvested share-based payment awards (689) (785) (720) Undistributed earnings $ (27,552) $ 41,922 $ 231,485 Undistributed earnings allocated to common shareholders $ (27,552) $ 41,675 $ 229,995 Undistributed earnings allocated to unvested share-based payment awards — 247 1,490 Undistributed earnings $ (27,552) $ 41,922 $ 231,485 Basic Distributed earnings to common shareholders $ 138,508 $ 128,748 $ 122,417 Undistributed earnings allocated to common shareholders (27,552) 41,675 229,995 Total common shareholders earnings, basic $ 110,956 $ 170,424 $ 352,412 Diluted Distributed earnings to common shareholders $ 138,508 $ 128,748 $ 122,417 Undistributed earnings allocated to common shareholders (27,552) 41,675 229,995 Total common shareholders earnings, diluted $ 110,956 $ 170,424 $ 352,412 Weighted average common shares outstanding 151,933 149,968 149,162 Effect of dilutive common stock awards 1,415 892 1,334 Diluted weighted average common shares outstanding 153,347 150,860 150,496 Basic earnings per common share $ 0.73 $ 1.14 $ 2.36 Diluted earnings per common share $ 0.72 $ 1.13 $ 2.34 Excluded from the earnings per common share calculation were 2 million anti-dilutive common stock options for the year ended December 31, 2024, and 3 million and 2 million anti-dilutive common stock options were excluded from the earnings per share calculations for the years ended December 31, 2023 and 2022, respectively.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Segment Reporting The Corporation is managed through operating segments based on our internal structure and management process, which is how we assess performance and allocate resources to the segments. Certain operating segments have been aggregated into our three reportable segments 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. A description of the products and services and the related customers for each reportable segment is as follows: Corporate and Commercial Specialty: The Corporate and Commercial Specialty segment serves a wide range of customers including 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. 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; and (3) specialized financial services such as interest rate risk management, and foreign exchange solutions. Community, Consumer and Business: The Community, Consumer and Business segment serves individuals and businesses by providing lending and deposit solutions and a variety of investment, fiduciary, and retirement planning products and services. 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; (2) deposit and transactional solutions such as checking, credit and debit cards, online banking and bill pay, and money transfer services; (3) fiduciary services such as administration of pension, profit-sharing and other employee benefit plans, fiduciary and corporate agency services, and institutional asset management; and (4) 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. 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 fourth quarter of 2024, the Corporation made the change to move the private wealth operating segment from the Corporate and Commercial Specialty segment to the Community, Consumer and Business segment given its continued alignment with the products, services, and customers of that segment. This impacted the composition of the reportable segments and the Corporation has recast the impacted items of reportable segment information for the earlier presented periods. The financial information of the Corporation’s segments disclosed below has been compiled utilizing the accounting policies described in Note 1, with certain exceptions based on internal management accounting policies. The significant exceptions are as follows: The Corporation allocates certain net interest income, the provision for credit losses, certain noninterest expenses, and income taxes to each operating 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. There were no significant changes in the current year to the methods for allocations to the segments from the prior periods. The Corporation allocates certain 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. This 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 above allocations is recorded within the Risk Management and Shared Services segment to ensure consolidated totals reflect the Corporation's consolidated financial information. Indirect expenses incurred by certain centralized support areas (including facilities, information technology services and applications, management expenses, and FDIC expense) are allocated to segments based on actual usage (for example, volume measurements or FTEs) 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 and remain in the Risk Management and Shared Services segment. This allocation is reflected as allocated indirect expense in the accompanying tables. Income tax expense (benefit) is 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. Financial information about the Corporation’s segments is presented below: As of and for the Year Ended December 31, 2024 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services (a) Consolidated Corporation Net segment interest income (expense) $ 976,878 $ 247,791 $ (177,421) $ 1,047,248 Net intersegment interest (expense) income (429,917) 579,587 (149,670) — Net interest income (expense) 546,961 827,378 (327,091) 1,047,248 Noninterest income (expense) 53,435 198,485 (261,327) (9,407) Total income (expense) before provision 600,396 1,025,863 (588,418) 1,037,841 Provision for credit losses 66,390 24,759 (6,163) 84,986 Total income (expense) after provision 534,006 1,001,104 (582,255) 952,855 Noninterest expense Personnel 79,853 232,787 175,316 487,956 Technology (b) 2,594 47,241 57,728 107,563 Occupancy (b) — 61 54,561 54,622 Business development and advertising 3,543 3,169 21,430 28,142 Equipment (b) 2 5,930 12,499 18,431 Legal and professional 825 1,978 18,798 21,601 Loan and foreclosure costs 1,100 5,018 2,353 8,471 FDIC assessment — — 38,439 38,439 Other intangible amortization — — 8,811 8,811 Loss on prepayments of FHLB advances — — 14,243 14,243 Other noninterest expense (income) 3,338 27,921 (1,141) 30,118 Allocated indirect expense (income) 88,036 205,979 (294,015) — Total noninterest expense 179,291 530,084 109,022 818,397 Net income (loss) before income taxes 354,715 471,020 (691,277) 134,459 Income tax expense (benefit) 64,346 97,460 (150,492) 11,314 Net income (loss) $ 290,369 $ 373,560 $ (540,785) $ 123,145 Loans $ 16,959,921 $ 12,318,648 $ 490,017 $ 29,768,586 Allocated goodwill 525,836 579,156 — 1,104,992 Total assets 17,794,372 13,892,891 11,335,805 43,023,068 (a) Unusual items including a $130 million loss on mortgage portfolio sale and a $148 million loss on investment securities as a result of the balance sheet repositioning announced in the fourth quarter of 2024 are included within the noninterest income (expense) caption. (b) A portion of total depreciation expense of approximately $242,000, $10 million, and $39 million for the Corporate and Commercial Specialty, Community Consumer and Business, and Risk Management and Shared Services segments, respectively, is included in this expense caption. As of and for the Year Ended December 31, 2023 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services (a) Consolidated Corporation Net segment interest income (expense) $ 933,929 $ 309,291 $ (203,647) $ 1,039,573 Net intersegment interest (expense) income (432,073) 487,897 (55,824) — Net interest income (expense) 501,856 797,188 (259,471) 1,039,573 Noninterest income (expense) 51,905 193,948 (182,671) 63,182 Total income (expense) before provision 553,761 991,136 (442,142) 1,102,756 Provision for credit losses 54,302 29,757 (1,038) 83,021 Total income (expense) after provision 499,459 961,379 (441,104) 1,019,734 Noninterest expense Personnel 71,688 236,385 160,282 468,355 Technology (b) 2,931 44,661 54,426 102,018 Occupancy (b) — 95 57,109 57,204 Business development and advertising 4,042 4,001 20,362 28,405 Equipment (b) 1 5,770 13,892 19,663 Legal and professional 1,359 1,933 16,619 19,911 Loan and foreclosure costs 877 3,065 1,466 5,408 FDIC assessment — — 67,072 67,072 Other intangible amortization — — 8,811 8,811 Other noninterest expense 3,501 29,800 3,534 36,837 Allocated indirect expense (income) 83,190 191,613 (274,803) — Total noninterest expense 167,589 517,323 128,770 813,682 Net income (loss) before income taxes 331,870 444,056 (569,873) 206,052 Income tax expense (benefit) 59,143 91,770 (127,816) 23,097 Net income (loss) $ 272,727 $ 352,286 $ (442,057) $ 182,956 Loans $ 16,045,897 $ 12,642,123 $ 528,198 29,216,218 Allocated goodwill 525,836 $ 579,156 — 1,104,992 Total assets 16,897,021 13,453,475 10,665,359 41,015,855 (a) Unusual items including a $136 million loss on mortgage portfolio sale and a $65 million loss on investment securities as a result of the balance sheet repositioning announced in the fourth quarter of 2023 are included within the noninterest income (expense) caption and a $31 million FDIC special assessment is included in the FDIC assessment caption. (b) A portion of total depreciation expense of approximately $164,000, $8 million, and $39 million for the Corporate and Commercial Specialty, Community Consumer and Business, and Risk Management and Shared Services segments, respectively, is included in this expense caption. As of and for the Year Ended December 31, 2022 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Net segment interest income $ 526,870 $ 362,420 $ 68,031 $ 957,321 Net intersegment interest (expense) income (118,059) 190,862 (72,803) — Net interest income (expense) 408,811 553,282 (4,772) 957,321 Noninterest income 58,938 205,660 17,772 282,370 Total income before provision 467,749 758,942 12,999 1,239,691 Provision for credit losses 47,939 22,359 (37,300) 32,998 Total income after provision 419,810 736,583 50,299 1,206,693 Noninterest expense Personnel 71,043 238,962 144,096 454,101 Technology (a) 3,029 33,330 54,341 90,700 Occupancy (a) — 82 59,712 59,794 Business development and advertising 3,703 3,428 18,394 25,525 Equipment (a) 1 5,365 14,266 19,632 Legal and professional 1,025 4,209 13,016 18,250 Loan and foreclosure costs 528 4,308 1,089 5,925 FDIC assessment — — 22,650 22,650 Other intangible amortization — — 8,811 8,811 Other noninterest expense 3,350 31,720 6,605 41,675 Allocated indirect expense (income) 73,548 173,645 (247,193) — Total noninterest expense 156,227 495,049 95,787 747,063 Net income (loss) before income taxes 263,583 241,534 (45,488) 459,630 Income tax expense (benefit) 47,440 49,347 (3,279) 93,508 Net income (loss) $ 216,143 $ 192,187 $ (42,209) $ 366,122 Loans $ 17,083,254 $ 11,231,404 $ 484,911 $ 28,799,569 Allocated goodwill 525,836 579,156 — 1,104,992 Total assets 17,909,477 12,073,694 9,422,556 39,405,727 (a) A portion of total depreciation expense of approximately $15,000, $4 million, and $41 million for the Corporate and Commercial Specialty, Community Consumer and Business, and Risk Management and Shared Services segments, respectively, is included in this expense caption. Expenses included within the other noninterest expense line of the segment information above relate to the remaining segment expenses including office expense and card issuance costs. None of the individual expense categories rise to the level of significance for the segment; however, they are utilized in determining the profit or loss measure for each segment. 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, reportable segments and the financial information of the reported segments are not necessarily comparable with similar information reported by other financial institutions. Furthermore, the information presented is not indicative of how the segments would perform if they operated as independent entities. The chief operating decision maker for each of the segments is the President and Chief Executive Officer of the Corporation. For the Corporate and Commercial Specialty and Community, Consumer and Business segments, the chief operating decision maker utilizes net interest income, net income and average total loans and deposits in allocating resources for each segment predominantly in the annual budget and forecasting process. The chief operating decision maker considers budget-to-actual variances on a monthly basis for both profit measures when making decisions about allocating capital and personnel to the segments. Based on the reviews of these two segments and other company-wide initiatives, the chief operating decision maker is informed about allocation of resources to the Risk Management and Shared Services segment.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2024
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), including changes during the years presented 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, 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 benefit (expense) 78,159 (54) 13,495 91,601 Net other comprehensive (loss) income 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) Other comprehensive (loss) income before reclassifications $ (23,978) $ — $ 2,210 $ (21,768) Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 148,380 — — 148,380 HTM investment securities, net, at amortized cost (a) 8,360 — — 8,360 Other assets / accrued expenses and other liabilities — (21,537) — (21,537) Interest income — 16,478 — 16,478 Personnel expense — — (290) (290) Other expense — — (28) (28) Income tax (expense) benefit (33,114) 710 (511) (32,915) Net other comprehensive income (loss) during period 99,648 (4,348) 1,381 96,681 Balance, December 31, 2024 $ (48,993) $ (1,268) $ (24,154) $ (74,416) (a) Amortization of net unrealized losses on AFS securities transferred to HTM securities.

Revenues (Notes)

Revenues (Notes)	12 Months Ended
	Dec. 31, 2024
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: For the Year Ended December 31, 2024 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Wealth management fees $ — $ 92,569 $ — $ 92,569 Service charges and deposit account fees 11,627 39,977 38 51,642 Card-based fees (a) 1,652 45,287 88 47,027 Other revenue (expense) 315 8,103 (138) 8,280 Noninterest income (loss) (in-scope of Topic 606) $ 13,594 $ 185,936 $ (12) $ 199,518 Noninterest income (loss) (out-of-scope of Topic 606) 39,841 12,549 (261,315) (208,925) Total noninterest income (loss) $ 53,435 $ 198,485 $ (261,327) $ (9,407) (a) Loan fees and certain card based fees are out-of-scope of Topic 606. For the Year Ended December 31, 2023 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Wealth management fees $ — $ 82,502 $ — $ 82,502 Service charges and deposit account fees 10,191 38,831 23 49,045 Card-based fees (a) 1,348 43,745 28 45,121 Other revenue 959 8,168 764 9,891 Noninterest income (in-scope of Topic 606) $ 12,498 $ 173,246 $ 815 $ 186,560 Noninterest income (loss) (out-of-scope of Topic 606) 39,407 20,702 (183,486) (123,377) Total noninterest income (loss) $ 51,905 $ 193,948 $ (182,671) $ 63,182 (a) Loan fees and certain card based fees are out-of-scope of Topic 606. For the Year Ended December 31, 2022 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Wealth management fees $ — $ 84,122 $ — $ 84,122 Service charges and deposit account fees 12,479 49,813 18 62,310 Card-based fees (a) 1,104 42,917 111 44,132 Other revenue 1,734 8,299 1,356 11,389 Noninterest income (in-scope of Topic 606) $ 15,317 $ 185,151 $ 1,485 $ 201,953 Noninterest income (out-of-scope of Topic 606) 43,621 20,510 16,286 80,417 Total noninterest income $ 58,938 $ 205,660 $ 17,772 $ 282,370 (a) Loan fees and 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, 2024
Restructuring and Related Activities [Abstract]
Recent Developments	Recent Developments On January 28, 2025, the Corporation's Board of Directors declared a regular quarterly cash dividend of $0.23 per common share, payable on March 17, 2025 to shareholders of record at the close of business on March 3, 2025. 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 17, 2025 to shareholders of record at the close of business on March 3, 2025. 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 17, 2025 to shareholders of record at the close of business on March 3, 2025.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 123,145	$ 182,956	$ 366,122

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Management and Strategy The Corporation recognizes the security of our banking operations is critical to protecting our customers, maintaining our reputation and preserving the value of the Corporation. The Corporation's Information Security Program establishes policies and procedures for the measurement of the effectiveness and efficiency of information security controls related to both design and operations. The Corporation leverages the following guidelines and frameworks to develop and maintain the Information Security Program: FFIEC Information Security IT Examination Handbook, FFIEC Business Continuity Planning Handbook, FFIEC Cybersecurity Assessment Tool, Center for Internet Security Critical Security Controls, National Institute of Standards and Technology Cybersecurity Framework, National Institute of Standards and Technology Special Publication 800 Series, ISO-27000 Standard and GLBA 501(b). This does not imply that we meet any particular technical standards, specifications, or requirements, only that we use these guidelines and frameworks as a guide to help us identify, assess, and manage cybersecurity risks relevant to our business. In general, the Corporation seeks to address cybersecurity risks through a comprehensive, cross-functional approach that is focused on confidentiality, security and availability of the information that the Corporation collects and stores by identifying, preventing, and mitigating cybersecurity threats and effectively responding to cyber threats when they occur. Among other things, the Information Security Program is focused on the following key areas: • Security Operation and Governance: As discussed in more detail under the heading “Governance,” senior management carries out this mandate through the Operational Risk and Enterprise Risk Management Committees. To maintain alignment and appropriate insight regarding information security activities, an Information Security Steering Committee provides general program insight. • Collaborative Approach: The Corporation has implemented a cross-functional approach to identifying, preventing and mitigating cybersecurity threats and incidents, while also implementing controls and procedures that provide for the prompt escalation of certain cybersecurity incidents so that decisions regarding the public disclosure and reporting of such incidents can be made by management in a timely manner. • Security Competencies: The Information Security organization oversees a program of security competencies and tools designed to protect the confidentiality, integrity, and availability of our data. These assets represent a blend of various management (e.g., policies), operational (e.g., standards and processes), and technical controls (e.g., tools and configurations). • Cyber Defense Center and the Incident Response Plan: The Corporation has a Security Operations Center, known as the “Cyber Defense Center,” which provides continual security monitoring 24 hours per day, seven days per week, where resources deliver threat analysis, vulnerability management, intrusion detection, intrusion hunting and red team exercises. The Corporation’s Incident Response Plan helps reduce the risks related to security incidents by providing guidelines on responding to incidents by focusing on a roadmap for coordinating personnel, policies, and procedures. • Third-Party Risk Management: Management of the Corporation’s third parties, including vendors and service providers, is conducted through a risk-based approach and the level of due diligence is driven from risk factors established by Corporate Risk Management. • Security Awareness and Education: The Corporation provides annual, mandatory training for personnel regarding security awareness as a means to equip the Corporation’s personnel with the understanding of how to properly use and protect the computing resources entrusted to them, and to communicate the Corporation’s information security policies, standards, processes and practices. The Corporation leverages regular assessments to identify current and potential threats and vulnerabilities within the Corporation’s environment, using vulnerability scanning tools, penetration testing, system management tools, and process and procedural reviews. The Corporation conducts a variety of assessments throughout the year, both internally and through third parties. We have not identified risks from known cybersecurity threats, including as a result of any prior cybersecurity incidents, that have materially affected us, including our operations, business strategy, results of operations, or financial condition. We face risks from cybersecurity threats that, if realized, are reasonably likely to materially affect us, including our operations, business strategy, results of operations, or financial condition. See Item 1A, Risk Factors — Operational Risks for additional disclosures with regard to the possible impact of future cybersecurity threats or incidents. Governance The Board of Directors, through the ERC, provides direction and oversight of the enterprise-wide risk management framework of the Corporation, and cybersecurity represents a component of the Corporation's overall approach to enterprise-wide risk management. The ERC reviews and approves the Information Security Policy. The Board of Directors receives regular presentations which include updates on cybersecurity risks, including the threat environment, evolving standards, projects and initiatives, vulnerability assessments, third-party and independent reviews, technological trends and information security considerations arising with respect to the Corporation’s peers and third parties. The Board of Directors also receives information regarding any cybersecurity incident that meets established reporting thresholds, as well as ongoing updates regarding any such incident until it has been addressed. On an annual basis, the full Board of Directors discusses the Corporation’s approach to cybersecurity risk management with the Corporation’s CISO. The CISO, under the guidance of our CIO, CRO, Chief Executive Officer and General Counsel, works collaboratively across the Corporation to implement an information security program. To facilitate the success of the Corporation’s cybersecurity risk management program, multidisciplinary teams throughout the Corporation are deployed to address cybersecurity threats and to respond to cybersecurity incidents. Through ongoing communications with these teams, the CISO and the 2nd Line Information Security Risk Management team monitor the prevention, detection, mitigation and remediation of cybersecurity threats and incidents in real time, and report such threats and incidents to the Corporate Crisis Management Team and ultimately the ERC when appropriate. The CISO has served in various roles in Information Technology and Information Security for over 35 years, including serving in the CISO role of two large public companies, including Associated Bank for 18 years. The CISO holds an undergraduate degree in Management Information Systems and has attained the professional Information Systems Audit and Control Association certification of Certified Information Security Manager in 2005. The CIO holds an undergraduate degree in business management, with a minor in international business, and is currently pursuing a master’s degree in cybersecurity and has served in various roles in information technology for over 40 years, including serving as either the Chief Technology Officer or CIO of four public companies. The CRO has over 30 years of banking experience, holds a degree in computer science, and earned the CERT Certificate in Cybersecurity Oversight from the National Association of Corporate Directors. The Corporation’s Chief Executive Officer and General Counsel each hold degrees in their respective fields, and each has extensive experience managing risks at the Corporation and similar financial institutions, including risks arising from cybersecurity threats.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
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. 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 2 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 2 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 3 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 3 for additional information on nonaccrual loans.
Troubled Debt Restructurings (Restructured Loans)	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. 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 3 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 3. 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. 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 3 for additional information on the ACLL and Note 15 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 3 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 term, 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 5 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 4 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 4 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 12 for additional information on income taxes.
Derivative and Hedging Activities	Derivative and Hedging Activities Derivative instruments are recorded in the consolidated balance sheets as either an asset or a liability and measured at fair value. Accounting for changes in fair value of derivatives depends on whether the derivative is designated and qualifies in a hedging relationship. At inception, the Corporation designates the derivative contract as either 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 non-designated hedge. Changes in the fair value of a derivative that has been designated and qualifies as a fair value hedge, along with the changes in the fair value of the hedged asset or liability that is attributable to the hedged risk, are recorded in current period earnings. Changes in the fair value of a derivative that has been designated and qualifies as a cash flow hedge are recorded in other comprehensive income, net of income taxes, and reclassified into earnings in the period during which the hedged item affects earnings. Changes in the fair value of derivatives which do not qualify for hedge accounting are reported in current period earnings. For those derivatives to which hedge accounting is applied, the Corporation formally documents the hedging relationship, the risk management objective, and strategy for undertaking the hedge. This documentation identifies the hedging instrument, the hedged item or transaction, the nature of the hedged risk, and, unless the hedge meets all of the criteria to assume there is no ineffectiveness, the method that will be used to assess the effectiveness of the hedging instrument. The Corporation typically assesses effectiveness using statistical regression at inception and on an ongoing basis, the shortcut method, or the critical terms match method. Shortcut method and critical terms match method assume perfect hedge effectiveness and eliminate the quantitative aspect of assessing hedge effectiveness. Hedge accounting is discontinued prospectively when: • The derivative is no longer effective or expected to be effective in offsetting changes in the fair value, cash flows, or changes in net investment of a hedged item (including firm commitments or forecasted transactions); • The derivative expires, is sold, terminated, or exercised; • The forecasted transaction is no longer probable of occurring by the end of the originally specified time period; • The hedged firm commitment no longer meets the definition of a firm commitment; or • the designation of the derivative as a hedging instrument is removed. When hedge accounting is discontinued and the derivative no longer qualifies as an effective fair value or cash flow hedge, the derivative continues to be carried on the balance sheet at fair value and changes in fair value will be recorded in current period earnings unless re-designated. Like other financial instruments, derivatives contain an element of credit risk, which is the possibility that the Corporation will incur a loss because the counterparty fails to meet its contractual obligations. Notional values of interest rate swaps and other off-balance sheet financial instruments significantly exceed the credit risk associated with these instruments and represent contractual balances on which calculations of amounts to be exchanged are based. Credit exposure is limited to the sum of the aggregate fair value of positions that have become favorable to the Corporation, including any accrued interest receivable due from counterparties. Potential credit losses are mitigated by derivatives through central clearing parties, careful evaluation of counterparty credit standing, selection of counterparties from a limited group of high quality institutions, collateral agreements, and other contract provisions. The corporation considers the value of collateral held and collateral provided in determining the net carrying value of derivatives. See Note 13 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 8 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 11 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 one or more performance measures as selected by the Compensation & Benefits Committee in its discretion, 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 10 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 stockholders' equity and consolidated statements of comprehensive income. See Note 21 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 17 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. The Corporation does not have any restricted cash as a result of the Federal Reserve reducing the required reserve ratio to zero.
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). See Note 19 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 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 The Corporation has determined the impact on its results of operation, financial position, liquidity, and disclosures is immaterial. 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 has determined the update does not have a significant impact on the consolidated financial statements, other than enhanced disclosures. 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 2023-09 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. Fiscal year 2025 The Corporation will adopt the enhanced income tax related disclosures within the consolidated financial statements for the year ended December 31, 2025. ASU 2024-03 Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40) The amendments in this update require a public business entity to disclose specific information about certain costs and expenses in the notes to its financial statements for interim and annual reporting periods. The objective of the disclosure requirements is to provide disaggregated information about a public business entity's expenses to help investors (a) better understand the entity's performance, (b) better assess the entity's prospects for future cash flows, and (c) compare an entity's performance over time and with that of other entities. The amendments in this update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. Fiscal year 2027 and interim periods beginning in 1st quarter 2028 The Corporation is currently evaluating the impact on its disclosures.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]	Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets. The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities Obligations of state and political subdivisions (municipal securities) $ 3,063 $ — $ (58) $ 3,005 Residential mortgage-related securities: FNMA/FHLMC 120,272 190 (9,534) 110,928 GNMA 4,236,199 5,379 (13,851) 4,227,727 Commercial mortgage-related securities: FNMA/FHLMC 18,332 — (1,332) 17,000 GNMA 116,275 — (4,800) 111,475 Asset backed securities: FFELP 108,319 123 (604) 107,839 SBA 495 — (24) 471 Other debt securities 3,000 — (11) 2,989 Total AFS investment securities $ 4,605,954 $ 5,693 $ (30,213) $ 4,581,434 HTM investment securities U.S. Treasury securities $ 1,000 $ — $ (1) $ 999 Obligations of state and political subdivisions (municipal securities) 1,659,722 1,122 (174,202) 1,486,642 Residential mortgage-related securities: FNMA/FHLMC 885,476 22,934 (186,464) 721,946 GNMA 43,693 9 (3,774) 39,927 Private-label 324,182 8,135 (65,963) 266,353 Commercial mortgage-related securities: FNMA/FHLMC 772,456 10,217 (159,078) 623,595 GNMA 52,219 236 (6,424) 46,032 Total HTM investment securities $ 3,738,747 $ 42,653 $ (595,906) $ 3,185,494 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
Debt Securities, Held-to-Maturity [Table Text Block]	Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets. The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows: ($ in thousands) Amortized Gross Gross Fair Value AFS investment securities Obligations of state and political subdivisions (municipal securities) $ 3,063 $ — $ (58) $ 3,005 Residential mortgage-related securities: FNMA/FHLMC 120,272 190 (9,534) 110,928 GNMA 4,236,199 5,379 (13,851) 4,227,727 Commercial mortgage-related securities: FNMA/FHLMC 18,332 — (1,332) 17,000 GNMA 116,275 — (4,800) 111,475 Asset backed securities: FFELP 108,319 123 (604) 107,839 SBA 495 — (24) 471 Other debt securities 3,000 — (11) 2,989 Total AFS investment securities $ 4,605,954 $ 5,693 $ (30,213) $ 4,581,434 HTM investment securities U.S. Treasury securities $ 1,000 $ — $ (1) $ 999 Obligations of state and political subdivisions (municipal securities) 1,659,722 1,122 (174,202) 1,486,642 Residential mortgage-related securities: FNMA/FHLMC 885,476 22,934 (186,464) 721,946 GNMA 43,693 9 (3,774) 39,927 Private-label 324,182 8,135 (65,963) 266,353 Commercial mortgage-related securities: FNMA/FHLMC 772,456 10,217 (159,078) 623,595 GNMA 52,219 236 (6,424) 46,032 Total HTM investment securities $ 3,738,747 $ 42,653 $ (595,906) $ 3,185,494 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
Investments Classified by Contractual Maturity Date [Table Text Block]	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, 2024, are shown below: AFS HTM ($ in thousands) Amortized Fair Amortized Fair Due in one year or less $ 1,000 $ 997 $ 17,800 $ 17,746 Due after one year through five years 3,040 3,026 62,054 61,286 Due after five years through ten years 1,390 1,387 187,803 179,653 Due after ten years 633 585 1,393,065 1,228,957 Total debt securities 6,063 5,994 1,660,722 1,487,641 Residential mortgage-related securities: FNMA/FHLMC 120,272 110,928 885,476 721,946 GNMA 4,236,199 4,227,727 43,693 39,927 Private-label — — 324,182 266,353 Commercial mortgage-related securities: FNMA/FHLMC 18,332 17,000 772,456 623,595 GNMA 116,275 111,475 52,219 46,032 Asset backed securities: FFELP 108,319 107,839 — — SBA 495 471 — — Total investment securities $ 4,605,954 $ 4,581,434 $ 3,738,747 $ 3,185,494 Ratio of fair value to amortized cost 99.5 % 85.2 %
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, 2024: ($ in thousands) AAA AA A Not Rated Total U.S. Treasury securities $ 1,000 $ — $ — $ — $ 1,000 Obligations of state and political subdivisions (municipal securities) 767,151 883,438 4,911 4,221 1,659,722 Residential mortgage-related securities: FNMA/FHLMC 885,476 — — — 885,476 GNMA 43,693 — — — 43,693 Private-label 324,182 — — — 324,182 Commercial mortgage-related securities: FNMA/FHLMC 772,456 — — — 772,456 GNMA 52,219 — — — 52,219 Total HTM securities $ 2,846,177 $ 883,438 $ 4,911 $ 4,221 $ 3,738,747 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
Schedule of Realized Gain (Loss) [Table Text Block]	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) 2024 2023 2022 Gross realized gains on AFS securities $ — $ 83 $ 21 Gross realized (losses) on AFS securities (148,380) (65,022) (1,943) Gain on sale and net write-up of equity securities 4,233 6,037 5,668 Investment securities (losses) gains, net $ (144,147) $ (58,903) $ 3,746 Proceeds from sales of AFS investment securities $ 1,141,231 $ 715,066 $ 110,177
Schedule of Unrealized Loss on Investments [Table Text Block]	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, 2024: Less than 12 months 12 months or more Total ($ in thousands) Number Unrealized Fair Number Unrealized Fair Unrealized (Losses) Fair AFS investment securities Obligations of state and political subdivisions (municipal securities) 1 $ (3) $ 542 2 $ (55) $ 828 $ (58) $ 1,370 Residential mortgage-related securities: FNMA/FHLMC 23 (607) 31,983 14 (8,927) 61,596 (9,534) 93,579 GNMA 116 (13,706) 1,660,642 4 (145) 3,945 (13,851) 1,664,587 Commercial mortgage-related securities: FNMA/FHLMC — — — 1 (1,332) 17,000 (1,332) 17,000 GNMA — — — 16 (4,800) 111,475 (4,800) 111,475 Asset backed securities: FFELP — — — 12 (604) 62,830 (604) 62,830 SBA — — — 4 (24) 464 (24) 464 Other debt securities 1 (7) 993 1 (3) 997 (11) 1,989 Total 141 $ (14,323) $ 1,694,159 54 $ (15,890) $ 259,134 $ (30,213) $ 1,953,294 HTM investment securities U.S. Treasury securities — $ — $ — 1 $ (1) $ 999 $ (1) $ 999 Obligations of state and political subdivisions (municipal securities) 370 (11,860) 483,073 641 (162,343) 866,949 (174,202) 1,350,022 Residential mortgage-related securities: FNMA/FHLMC 12 (280) 11,617 106 (186,184) 710,114 (186,464) 721,732 GNMA 7 (183) 8,856 79 (3,591) 31,071 (3,774) 39,927 Private-label — — — 18 (65,963) 266,353 (65,963) 266,353 Commercial mortgage-related securities: FNMA/FHLMC 2 (1,343) 25,518 43 (157,735) 598,077 (159,078) 623,595 GNMA — — — 13 (6,424) 46,032 (6,424) 46,032 Total 391 $ (13,665) $ 529,064 901 $ (582,241) $ 2,519,595 $ (595,906) $ 3,048,660 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, 2023: 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 — $ — $ — 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

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2024
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The period end loan composition was as follows: ($ in thousands) Dec 31, 2024 Dec 31, 2023 Commercial and industrial $ 10,573,741 $ 9,731,555 Commercial real estate - owner occupied 1,143,741 1,061,700 Commercial and business lending 11,717,483 10,793,255 Commercial real estate - investor 5,227,975 5,124,245 Real estate construction 1,982,632 2,271,398 Commercial real estate lending 7,210,607 7,395,644 Total commercial 18,928,090 18,188,898 Residential mortgage 7,047,541 7,864,891 Auto finance 2,810,220 2,256,162 Home equity 664,252 628,526 Other consumer 318,483 277,740 Total consumer 10,840,496 11,027,319 Total loans $ 29,768,586 $ 29,216,218
Schedule of Related Party Transactions [Table Text Block]	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) 2024 2023 Balance at beginning of year $ 5,406 $ 3,376 New loans 17,395 2,564 Repayments (2,359) (253) Change due to status of executive officers and directors 838 (280) Balance at end of year $ 21,280 $ 5,406
Financing Receivable Credit Quality Indicators [Table Text Block]	The following table presents loans by credit quality indicator by origination year at December 31, 2024: Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2024 2023 2022 2021 2020 Prior Total Commercial and industrial: Risk rating: Pass $ 248 $ 1,841,790 $ 2,656,953 $ 1,514,277 $ 2,254,758 $ 1,080,180 $ 263,286 $ 510,301 $ 10,121,545 Special mention — 48,829 4,037 4,810 63,390 6,984 515 48 128,613 Substandard 2,015 40,240 90,240 9,677 34,730 126,134 3,347 131 304,500 Nonaccrual 42 — 772 4,468 12,988 855 — — 19,084 Commercial and industrial $ 2,306 $ 1,930,860 $ 2,752,002 $ 1,533,233 $ 2,365,866 $ 1,214,154 $ 267,148 $ 510,480 $ 10,573,741 Commercial real estate - owner occupied: Risk rating: Pass $ — $ 13,760 $ 228,913 $ 175,059 $ 180,132 $ 214,237 $ 114,064 $ 181,982 $ 1,108,147 Special mention — — — 497 — 8,619 — 2,803 11,920 Substandard — 943 2,532 10,009 1,492 701 3,371 3,125 22,173 Nonaccrual — — — 1,501 — — — — 1,501 Commercial real estate - owner occupied $ — $ 14,703 $ 231,446 $ 187,066 $ 181,625 $ 223,557 $ 117,435 $ 187,911 $ 1,143,741 Commercial and business lending: Risk rating: Pass $ 248 $ 1,855,550 $ 2,885,866 $ 1,689,336 $ 2,434,891 $ 1,294,416 $ 377,350 $ 692,283 $ 11,229,693 Special mention — 48,829 4,037 5,307 63,390 15,604 515 2,852 140,532 Substandard 2,015 41,183 92,772 19,686 36,222 126,835 6,719 3,255 326,673 Nonaccrual 42 — 772 5,969 12,988 855 — — 20,585 Commercial and business lending $ 2,306 $ 1,945,563 $ 2,983,447 $ 1,720,298 $ 2,547,491 $ 1,437,710 $ 384,583 $ 698,390 $ 11,717,483 Commercial real estate - investor: Risk rating: Pass $ — $ 190,451 $ 1,334,740 $ 725,652 $ 1,179,867 $ 723,994 $ 321,084 $ 363,288 $ 4,839,076 Special mention — — 69,014 6,385 30,672 12,312 6,870 10,366 135,618 Substandard — — 69,385 53,022 93,151 10,724 384 9,910 236,576 Nonaccrual — — 11,949 — — 4,757 — — 16,705 Commercial real estate - investor $ — $ 190,451 $ 1,485,088 $ 785,058 $ 1,303,690 $ 751,786 $ 328,338 $ 383,563 $ 5,227,975 Real estate construction: Risk rating: Pass $ — $ 30,090 $ 278,754 $ 390,845 $ 807,347 $ 142,137 $ 25,654 $ 7,260 $ 1,682,086 Special mention — — 19,419 — 96,442 — — — 115,862 Substandard — — 28,241 6,000 105,660 44,754 — — 184,654 Nonaccrual — — — — — — — 30 30 Real estate construction $ — $ 30,090 $ 326,414 $ 396,845 $ 1,009,450 $ 186,890 $ 25,654 $ 7,289 $ 1,982,632 Commercial real estate lending: Risk rating: Pass $ — $ 220,541 $ 1,613,494 $ 1,116,496 $ 1,987,215 $ 866,130 $ 346,738 $ 370,548 $ 6,521,163 Special mention — — 88,433 6,385 127,114 12,312 6,870 10,366 251,480 Substandard — — 97,626 59,022 198,811 55,477 384 9,910 421,230 Nonaccrual — — 11,949 — — 4,757 — 30 16,735 Commercial real estate lending $ — $ 220,541 $ 1,811,502 $ 1,181,903 $ 2,313,140 $ 938,677 $ 353,992 $ 390,853 $ 7,210,607 Total commercial: Risk rating: Pass $ 248 $ 2,076,092 $ 4,499,360 $ 2,805,832 $ 4,422,105 $ 2,160,547 $ 724,088 $ 1,062,831 $ 17,750,855 Special mention — 48,829 92,469 11,692 190,504 27,916 7,385 13,217 392,012 Substandard 2,015 41,183 190,399 78,708 235,033 182,313 7,103 13,165 747,903 Nonaccrual 42 — 12,721 5,969 12,988 5,612 — 30 37,320 Total commercial $ 2,306 $ 2,166,104 $ 4,794,949 $ 2,902,201 $ 4,860,631 $ 2,376,387 $ 738,576 $ 1,089,243 $ 18,928,090 Term Loans Amortized Cost Basis by Origination Year (a) ($ in thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2024 2023 2022 2021 2020 Prior Total Residential mortgage: Risk rating: Pass $ — $ — $ 172,607 $ 507,186 $ 1,579,182 $ 1,643,341 $ 1,195,752 $ 1,878,251 $ 6,976,319 Special mention — — — — — — — 162 162 Substandard — — 594 327 77 — — 24 1,022 Nonaccrual — — 2,338 2,134 11,420 10,141 8,297 35,708 70,038 Residential mortgage $ — $ — $ 175,539 $ 509,647 $ 1,590,679 $ 1,653,482 $ 1,204,049 $ 1,914,144 $ 7,047,541 Auto finance: Risk rating: Pass $ — $ — $ 1,241,609 $ 858,924 $ 650,880 $ 48,999 $ 67 $ 77 $ 2,800,555 Special mention — — 332 704 1,048 178 — — 2,262 Nonaccrual — — 491 2,162 4,284 466 — — 7,402 Auto finance $ — $ — $ 1,242,431 $ 861,790 $ 656,212 $ 49,643 $ 67 $ 77 $ 2,810,220 Home equity: Risk rating: Pass $ 8,764 $ 569,866 $ 411 $ 1,684 $ 25,372 $ 5,289 $ 1,965 $ 50,841 $ 655,429 Special mention 127 81 41 — — — — 323 445 Nonaccrual 1,677 104 15 103 933 231 215 6,778 8,378 Home equity $ 10,568 $ 570,051 $ 467 $ 1,788 $ 26,305 $ 5,520 $ 2,180 $ 57,941 $ 664,252 Other consumer: Risk rating: Pass $ 308 $ 241,230 $ 14,343 $ 4,808 $ 2,475 $ 1,440 $ 584 $ 49,886 $ 314,767 Special mention — 1,125 8 — 36 7 — — 1,176 Substandard — 2,418 — — — — — — 2,418 Nonaccrual 2 81 5 21 7 4 — 4 122 Other consumer $ 310 $ 244,855 $ 14,356 $ 4,829 $ 2,518 $ 1,451 $ 584 $ 49,891 $ 318,483 Total consumer: Risk rating: Pass $ 9,071 $ 811,096 $ 1,428,969 $ 1,372,603 $ 2,257,910 $ 1,699,069 $ 1,198,368 $ 1,979,055 $ 10,747,070 Special mention 127 1,207 381 704 1,083 185 — 484 4,045 Substandard — 2,418 594 327 77 — — 24 3,440 Nonaccrual 1,679 185 2,849 4,420 16,644 10,842 8,512 42,490 85,941 Total consumer $ 10,878 $ 814,906 $ 1,432,794 $ 1,378,053 $ 2,275,714 $ 1,710,096 $ 1,206,880 $ 2,022,053 $ 10,840,496 Total loans: Risk rating: Pass $ 9,320 $ 2,887,188 $ 5,928,329 $ 4,178,435 $ 6,680,015 $ 3,859,616 $ 1,922,456 $ 3,041,886 $ 28,497,925 Special mention 127 50,036 92,851 12,396 191,587 28,101 7,385 13,701 396,057 Substandard 2,015 43,602 190,993 79,035 235,110 182,313 7,103 13,189 751,344 Nonaccrual 1,721 185 15,570 10,389 29,632 16,453 8,512 42,519 123,260 Total loans $ 13,183 $ 2,981,010 $ 6,227,743 $ 4,280,254 $ 7,136,344 $ 4,086,483 $ 1,945,455 $ 3,111,296 $ 29,768,586 (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, 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 $ 1,693,249 $ 1,736,617 $ 2,877,173 $ 1,824,362 $ 398,046 $ 383,695 $ 449,006 $ 9,362,149 Special mention — 21,779 4,017 46,610 8,525 3,529 — 25,341 109,801 Substandard 804 81,924 10,515 39,748 47,279 17,732 94 291 197,582 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 Substandard — 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 $ 1,708,642 $ 1,940,657 $ 3,065,177 $ 2,063,580 $ 534,581 $ 519,426 $ 541,345 $ 10,373,408 Special mention — 22,050 4,017 46,610 14,675 6,164 — 26,634 120,150 Substandard 804 82,216 25,250 42,539 53,695 26,269 3,180 3,132 236,281 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 $ 1,247,434 $ 1,080,425 $ 471,371 $ 358,996 $ 239,230 $ 4,816,433 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Substandard — — 106,002 69,584 15,000 983 — 24,025 215,595 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 $ 2,424,042 $ 1,628,250 $ 559,052 $ 364,737 $ 247,184 $ 7,087,824 Special mention — 502 4,248 25,474 26,208 — 29,772 6,014 92,218 Substandard — — 106,002 69,584 15,000 983 — 24,025 215,595 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 $ 1,887,058 $ 3,626,800 $ 5,489,219 $ 3,691,830 $ 1,093,633 $ 884,162 $ 788,529 $ 17,461,232 Special mention — 22,552 8,265 72,084 40,882 6,164 29,772 32,648 212,368 Substandard 804 82,216 131,253 112,123 68,695 27,253 3,180 27,157 451,876 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 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 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 Substandard — — 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 Auto finance: Risk rating: Pass $ — $ — $ 1,218,820 $ 952,839 $ 75,209 $ 163 $ 456 $ 132 $ 2,247,618 Special mention — — 619 1,850 205 — — — 2,674 Substandard — — — 73 — — — — 73 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 Substandard 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 $ 196,632 $ 6,419 $ 3,732 $ 2,658 $ 1,127 $ 460 $ 64,121 $ 275,149 Special mention 26 843 9 — 3 20 — 6 881 Substandard — 1,582 — — — — — — 1,582 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 $ 717,632 $ 1,579,238 $ 2,603,843 $ 2,194,529 $ 1,417,802 $ 653,584 $ 1,768,145 $ 10,934,773 Special mention 205 1,043 628 1,936 208 49 110 441 4,416 Substandard 10 1,656 500 166 — — 207 26 2,556 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 $ 2,604,690 $ 5,206,038 $ 8,093,062 $ 5,886,359 $ 2,511,435 $ 1,537,747 $ 2,556,674 $ 28,396,005 Special mention 205 23,595 8,893 74,020 41,091 6,213 29,882 33,089 216,784 Substandard 814 83,872 131,753 112,289 68,695 27,253 3,387 27,183 454,432 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 gross charge offs by origination year at December 31, 2024: Gross Charge Offs by Origination Year ($ in thousands) Rev Loans Amortized Cost Basis 2024 2023 2022 2021 2020 Prior Total Commercial and industrial $ 4,433 $ 128 $ 11,484 $ 8,510 $ 22,959 $ 3 $ — $ 47,517 Commercial real estate-owner occupied — — — — — — 3 3 Commercial and business lending 4,433 128 11,484 8,510 22,959 3 3 47,520 Commercial real estate-investor — 6,617 1 — 4,569 — — 11,187 Real estate construction — — — — — — — — Commercial real estate lending — 6,617 1 — 4,569 — — 11,187 Total commercial 4,433 6,745 11,485 8,510 27,528 3 3 58,707 Residential mortgage — — 134 125 101 153 515 1,029 Auto finance — 418 2,982 5,582 560 — — 9,541 Home equity 93 — — 9 19 10 85 216 Other consumer 6,555 20 96 75 75 42 59 6,922 Total consumer 6,649 438 3,212 5,790 755 205 659 17,709 Total gross charge offs $ 11,082 $ 7,183 $ 14,697 $ 14,300 $ 28,283 $ 209 $ 662 $ 76,415 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
Financing Receivable, Past Due [Table Text Block]	The following table presents loans by past due status at December 31, 2024: Accruing ($ in thousands) Current 30-59 Days 60-89 Days 90+ Days Nonaccrual (a)(b) Total Commercial and industrial $ 10,552,756 $ 899 $ 361 $ 642 $ 19,084 $ 10,573,741 Commercial real estate - owner occupied 1,140,607 1,533 101 — 1,501 1,143,741 Commercial and business lending 11,693,363 2,432 462 642 20,585 11,717,483 Commercial real estate - investor 5,174,879 5,117 31,274 — 16,705 5,227,975 Real estate construction 1,982,581 21 — — 30 1,982,632 Commercial real estate lending 7,157,460 5,138 31,274 — 16,735 7,210,607 Total commercial 18,850,823 7,570 31,736 642 37,320 18,928,090 Residential mortgage 6,962,610 14,731 162 — 70,038 7,047,541 Auto finance 2,787,967 12,588 2,262 — 7,402 2,810,220 Home equity 651,248 4,181 445 — 8,378 664,252 Other consumer 312,687 1,892 1,236 2,547 122 318,483 Total consumer 10,714,512 33,391 4,105 2,547 85,941 10,840,496 Total loans $ 29,565,335 $ 40,961 $ 35,841 $ 3,189 $ 123,260 $ 29,768,586 (a) Of the total nonaccrual loans, $52 million, or 42%, were current with respect to payment at December 31, 2024. (b) No interest income was recognized on nonaccrual loans for the year ended December 31, 2024. In addition, there were $24 million of nonaccrual loans for which there was no related ACLL at December 31, 2024. The following table presents loans by past due status at December 31, 2023: Accruing ($ 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 $23 million of nonaccrual loans for which there was no related ACLL at December 31, 2023.
Financing Receivable, Modified [Table Text Block]	The following tables show the composition of loan modifications made to borrowers experiencing financial difficulty by the loan portfolio and type of concessions granted. Each of the types of concessions granted comprised less than 1% of their respective classes of loan portfolios at both December 31, 2024 and December 31, 2023. Interest Rate Concession Amortized Cost Twelve Months Ended December 31, ($ in thousands) 2024 2023 Commercial and industrial $ 475 $ 306 Residential mortgage 295 — Auto finance 10 255 Home equity — 77 Other consumer 2,239 1,449 Total loans modified $ 3,019 $ 2,087 Term Extension Amortized Cost Twelve Months Ended December 31, ($ in thousands) 2024 2023 Residential mortgage $ — $ 208 Home equity — 25 Total loans modified $ — $ 233 Combination - Interest Rate Concession and Term Extension Amortized Cost Twelve Months Ended December 31, ($ in thousands) 2024 2023 Residential mortgage $ 2,849 $ 865 Home equity 244 339 Total loans modified $ 3,093 $ 1,204 The following tables summarize, by loan portfolio, the financial effect of the Corporation's loan modifications on the modified loans: Interest Rate Concession Financial Effect, Weighted Average Contractual Interest Rate (Decrease) Increase (a) Twelve Months Ended December 31, Loan Type 2024 2023 Commercial and industrial (18) % (19) % Residential mortgage 2 % 1 % Auto finance (7) % (9) % Home equity (3) % — % Other consumer (21) % (21) % Weighted average of total loans modified (8) % (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 Financial Effect, Weighted Average Term Increase (a) Twelve Months Ended December 31, Loan Type 2024 2023 Residential mortgage 108 months 65 months Home equity 63 months 85 months Weighted average of total loans modified 105 months 71 months (a) During the twelve months ended December 31, 2024 and December 31, 2023, term extensions changed the weighted average term on modified loans from 282 to 386 months and 175 to 245 months, respectively.
Financing Receivable, Modified, Past Due [Table Text Block]	The following table depicts the performance of loans that have been modified in the twelve months ended December 31, 2024: Payment Status (Amortized Cost Basis) ($ in thousands) Current 30-89 Days Past Due 90+ Days Past Due Commercial and industrial $ 475 $ — $ — Residential mortgage 2,355 453 336 Auto finance 5 3 2 Home equity 244 — — Other consumer 2,239 — — Total loans modified $ 5,318 $ 456 $ 338 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 Commercial and industrial $ 306 $ — $ — Residential mortgage 773 56 245 Auto finance 218 36 — Home equity 310 123 9 Other consumer 1,449 — — Total loans modified $ 3,056 $ 215 $ 253
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, 2024: Amortized Cost of Loan Modifications that Subsequently Defaulted ($ in thousands) Interest Rate Concession Term Extension Combination Interest Rate Reduction and Term Extension Residential mortgage $ — $ — $ 151 Auto finance 2 — — Home equity — — 186 Total loans modified $ 2 $ — $ 337 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, 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, prior to the adoption of ASU 2022-02: ($ 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, prior to the adoption of ASU 2022-02: ($ in thousands) Number of Recorded Residential mortgage 4 $ 1,178
Financing Receivable, Allowance for Credit Loss [Table Text Block]	The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2024: ($ in thousands) Dec 31, 2023 Charge Offs Recoveries Net Charge Offs Provision for Credit Losses Dec 31, 2024 ACLL / Loans Allowance for loan losses Commercial and industrial $ 128,263 $ (47,517) $ 2,148 $ (45,369) $ 53,703 $ 136,596 Commercial real estate — owner occupied 10,610 (3) 7 4 (1,198) 9,417 Commercial and business lending 138,873 (47,520) 2,155 (45,365) 52,505 146,013 Commercial real estate — investor 67,858 (11,187) — (11,187) 14,876 71,547 Real estate construction 53,554 — 65 65 (2,119) 51,499 Commercial real estate lending 121,412 (11,187) 65 (11,122) 12,756 123,046 Total commercial 260,285 (58,707) 2,220 (56,487) 65,262 269,060 Residential mortgage 37,808 (1,029) 280 (750) (4,483) 32,576 Auto finance 24,961 (9,541) 2,905 (6,637) 10,142 28,467 Home equity 15,403 (216) 1,366 1,150 67 16,620 Other consumer 12,638 (6,922) 1,096 (5,826) 10,012 16,824 Total consumer 90,809 (17,709) 5,647 (12,062) 15,738 94,486 Total loans $ 351,094 $ (76,415) $ 7,867 $ (68,549) $ 81,000 $ 363,545 Allowance for unfunded commitments Commercial and industrial $ 13,319 $ — $ — $ — $ 1,137 $ 14,456 Commercial real estate — owner occupied 149 — — — 2 151 Commercial and business lending 13,468 — — — 1,139 14,607 Commercial real estate — investor 480 — — — 98 578 Real estate construction 17,024 — — — 2,567 19,591 Commercial real estate lending 17,504 — — — 2,664 20,169 Total commercial 30,972 — — — 3,803 34,776 Home equity 2,629 — — — (164) 2,465 Other consumer 1,174 — — — 361 1,535 Total consumer 3,803 — — — 197 4,000 Total loans $ 34,776 $ — $ — $ — $ 4,000 $ 38,776 Allowance for credit losses on loans Commercial and industrial $ 141,582 $ (47,517) $ 2,148 $ (45,369) $ 54,840 $ 151,052 1.43 % Commercial real estate — owner occupied 10,759 (3) 7 4 (1,196) 9,568 0.84 % Commercial and business lending 152,341 (47,520) 2,155 (45,365) 53,644 160,620 1.37 % Commercial real estate — investor 68,338 (11,187) — (11,187) 14,973 72,125 1.38 % Real estate construction 70,578 — 65 65 447 71,090 3.59 % Commercial real estate lending 138,916 (11,187) 65 (11,122) 15,421 143,215 1.99 % Total commercial 291,257 (58,707) 2,220 (56,487) 69,065 303,835 1.61 % Residential mortgage 37,808 (1,029) 280 (750) (4,483) 32,576 0.46 % Auto finance 24,961 (9,541) 2,905 (6,637) 10,142 28,467 1.01 % Home equity 18,032 (216) 1,366 1,150 (97) 19,085 2.87 % Other consumer 13,812 (6,922) 1,096 (5,826) 10,373 18,359 5.76 % Total consumer 94,613 (17,709) 5,647 (12,062) 15,935 98,486 0.91 % Total loans $ 385,870 $ (76,415) $ 7,867 $ (68,549) $ 85,000 $ 402,322 1.35 % 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 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	The Corporation has CDIs which are amortized. Changes in the gross carrying amount, accumulated amortization, and net book value for CDIs were as follows: ($ in thousands) 2024 2023 2022 Core deposit intangibles Gross carrying amount at the beginning of the year $ 88,109 $ 88,109 $ 88,109 Accumulated amortization (56,449) (47,638) (38,827) Net book value $ 31,660 $ 40,471 $ 49,282 Amortization during the year $ 8,811 $ 8,811 $ 8,811
Schedule of Servicing Assets at Fair Value [Table Text Block]	A summary of changes in the balance of the MSRs asset under the fair value measurement method is as follows: ($ in thousands) 2024 2023 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 84,390 $ 77,351 Additions 6,707 3,564 Decay (8,060) (7,185) Valuation: Change in fair value model assumptions — 8,881 Changes in fair value of asset 4,646 1,778 Mortgage servicing rights at end of period $ 87,683 $ 84,390 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) (a) $ 6,285,018 $ 7,364,492 Mortgage servicing rights to servicing portfolio (a) 1.40 % 1.15 %
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	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, 2024. 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 yearly amortization expense for CDIs and decay for MSRs: ($ in thousands) Core Deposit Intangibles Mortgage Servicing Rights 2025 $ 8,811 $ 9,767 2026 8,811 11,230 2027 8,811 11,602 2028 3,485 10,945 2029 1,681 9,767 Beyond 2029 61 34,373 Total estimated amortization expense and MSRs decay (a) $ 31,660 $ 87,683

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	A summary of the Corporation's premises and equipment is as follows: December 31, 2024 December 31, 2023 ($ in thousands) Estimated Cost Accumulated Net Book Net Book Land — $ 63,642 $ — $ 63,642 $ 63,984 Land improvements 3 – 20 years 22,911 11,533 11,379 11,250 Buildings and improvements 5 – 40 years 415,690 198,699 216,991 212,004 Computers and related equipment 4 – 8 years 60,198 50,055 10,143 10,845 Furniture, fixtures, and other equipment 3 – 20 years 116,482 91,823 24,658 35,627 Operating leases — 56,818 23,616 33,202 24,712 Leasehold improvements 2 – 20 years 46,192 27,113 19,078 14,556 Total premises and equipment $ 781,932 $ 402,840 $ 379,093 $ 372,978

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
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) 2024 2023 2022 Operating lease costs $ 6,414 $ 6,281 $ 6,812 Finance lease costs 373 92 119 Operating lease cash flows 6,617 7,171 8,440 Finance lease cash flows 93 92 125
Assets And Liabilities, Lessee [Table Text Block]	The right-of-use asset and lease liability by lease classifications on the consolidated balance sheets were as follows: Consolidated Balance Sheets Category ($ in thousands) December 31, 2024 December 31, 2023 Operating lease right-of-use asset Premises and equipment $ 33,202 $ 24,712 Finance lease right-of-use asset Other assets — 368 Operating lease liability Accrued expenses and other liabilities 35,596 27,311 Finance lease liability Other long-term funding 295 383
Lessee, 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, 2024 December 31, 2023 ($ 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 $ 39,072 8.30 4.26 % $ 25,729 5.76 3.12 % Land 3,228 6.63 3.52 % 4,050 6.98 3.48 % Equipment 204 1.50 4.62 % 408 2.50 4.62 % Total operating leases $ 42,505 8.13 4.20 % $ 30,187 5.88 3.19 % Finance leases Retail and corporate offices $ 301 3.25 1.32 % $ 394 4.25 1.32 % Total finance leases $ 301 3.25 1.32 % $ 394 4.25 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 2025 $ 6,760 $ 93 $ 6,853 2026 6,228 93 6,321 2027 5,572 93 5,664 2028 4,845 23 4,868 2029 3,612 — 3,612 Beyond 2029 15,487 — 15,487 Total lease payments $ 42,505 $ 301 $ 42,806 Less: interest 6,909 6 6,915 Present value of lease payments $ 35,596 $ 295 $ 35,891
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 2025 $ 6,565 $ 3,628 2026 6,293 3,475 2027 5,636 3,170 2028 4,855 2,510 2029 3,604 2,454 Beyond 2029 15,650 11,493 Total $ 42,603 $ 26,730

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2024
Deposits [Abstract]
Deposit Liabilities, Type	The distribution of deposits is as follows: ($ in thousands) December 31, 2024 December 31, 2023 Noninterest-bearing demand $ 5,775,657 $ 6,119,956 Savings 5,133,295 4,835,701 Interest-bearing demand 9,124,741 8,843,967 Money market 6,637,915 6,330,453 Brokered CDs 4,276,309 4,447,479 Other time deposits 3,700,518 2,868,494 Total deposits $ 34,648,434 $ 33,446,049
Time Deposit Maturities	Aggregate annual maturities of all time deposits at December 31, 2024, are as follows: Maturities During Year Ending December 31, ($ in thousands) 2025 $ 7,898,330 2026 47,925 2027 17,814 2028 6,204 2029 6,550 Thereafter 5 Total $ 7,976,827

Short and Long-term Funding (Ta

Short and Long-term Funding (Tables)	12 Months Ended
	Dec. 31, 2024
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, 2024 December 31, 2023 Short-term funding Federal funds purchased $ 370,325 $ 220,160 Securities sold under agreements to repurchase 100,044 106,620 Federal funds purchased and securities sold under agreements to repurchase $ 470,369 $ 326,780 Long-term funding Corporation senior notes, at par $ 300,000 $ — Corporation subordinated notes, at par 550,000 550,000 Discount and capitalized costs (8,664) (7,748) Subordinated debt fair value hedge (a) (3,996) (1,366) Finance leases 295 383 Total long-term funding $ 837,635 $ 541,269 Total short and long-term funding, excluding FHLB advances $ 1,308,004 $ 868,049 FHLB advances Short-term FHLB advances $ 1,250,000 $ 740,000 Long-term FHLB advances 611,551 1,209,907 FHLB advances fair value hedge (a) (7,744) (9,713) Total FHLB advances $ 1,853,807 $ 1,940,194 Total short and long-term funding $ 3,161,811 $ 2,808,243 (a) For additional information on the fair value hedges, see Note 13.
Schedule of Repurchase Agreements	The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets is presented in the following table: Overnight and Continuous ($ in thousands) December 31, 2024 December 31, 2023 Repurchase agreements Agency mortgage-related securities $ 100,044 $ 106,620
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, 2024: ($ in thousands) Long Term Funding Year 2025 $ 648,841 2026 4,504 2027 510 2028 196,487 2029 3,235 Beyond 2029 587,865 Total long-term funding $ 1,441,442

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
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, 2024 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Aggregate Intrinsic Value (a) Outstanding at December 31, 2023 3,792 $ 21.25 4.26 years $ 5,834 Exercised 1,923 20.06 Forfeited or expired 91 24.85 Outstanding at December 31, 2024 1,778 $ 22.36 3.41 years $ 3,693 Options exercisable at December 31, 2024 1,778 $ 22.36 3.41 years $ 3,693 (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, 2024: Restricted Stock Shares (a) Weighted Average Outstanding at December 31, 2023 2,349 $ 21.20 Granted 837 20.76 Vested 790 23.64 Forfeited 87 21.96 Outstanding at December 31, 2024 2,310 $ 21.25 (a) In thousands

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The funded status and amounts recognized on the 2024 and 2023 consolidated balance sheets for the RAP and Postretirement Plan were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2024 2024 2023 2023 Change in fair value of plan assets Fair value of plan assets at beginning of year $ 453,457 $ — $ 407,405 $ — Actual return on plan assets 43,676 — 60,565 — Employer contributions — 183 — 171 Gross benefits paid (18,163) (183) (14,513) (171) Fair value of plan assets at end of year (a) $ 478,970 $ — $ 453,457 $ — Change in benefit obligation Net benefit obligation at beginning of year $ 211,353 $ 1,425 $ 208,315 $ 1,530 Service cost 3,027 — 3,189 — Interest cost 11,173 73 10,887 78 Actuarial loss (gain) 5,975 729 3,475 (12) Gross benefits paid (18,163) (183) (14,513) (171) Net benefit obligation at end of year (a) $ 213,365 $ 2,043 $ 211,353 $ 1,425 Funded (unfunded) status $ 265,605 $ (2,043) $ 242,104 $ (1,425) Noncurrent assets $ 265,605 $ — $ 242,104 $ — Current liabilities — (212) — (158) Noncurrent liabilities — (1,832) — (1,267) Asset (liability) recognized on the consolidated balance sheets $ 265,605 $ (2,043) $ 242,104 $ (1,425) (a) The fair value of the plan assets represented 224% and 215% of the net benefit obligation of the pension plan at December 31, 2024 and 2023, respectively.
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]	Amounts recognized in accumulated other comprehensive (income) loss, net of tax, were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2024 2024 2023 2023 Prior service cost $ (723) $ (252) $ (884) $ (308) Net actuarial loss (gain) 24,758 267 27,089 (301) Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss $ 24,035 $ 15 $ 26,204 $ (609)
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	Other changes in plan assets and benefit obligations recognized in OCI, net of tax were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2024 2024 2023 2023 Net actuarial gain (loss) $ 3,102 $ (729) $ 24,228 $ 12 Amortization of prior service cost (215) (75) (250) (75) Amortization of actuarial loss (gain) — (28) — (29) Income tax (expense) benefit (718) 208 (6,327) 23 Total recognized in OCI $ 2,169 $ (624) $ 17,650 $ (68)
Schedule of Net Benefit Costs [Table Text Block]	The components of net periodic pension cost for the RAP were as follows: ($ in thousands) 2024 2023 2022 Service cost $ 3,027 $ 3,189 $ 3,670 Interest cost 11,173 10,887 7,152 Expected return on plan assets (34,599) (32,862) (26,903) Amortization of prior service cost (215) (250) (250) Amortization of actuarial loss — — 658 Total net periodic pension (income) $ (20,614) $ (19,037) $ (15,673)
Net period benefit cost for postretirement plan	The components of net periodic benefit cost for the Postretirement Plan were as follows: ($ in thousands) 2024 2023 2022 Interest cost $ 73 $ 78 $ 53 Amortization of prior service cost (75) (75) (75) Amortization of actuarial (gain) (28) (29) — Total net periodic benefit (income) $ (31) $ (26) $ (22)
Defined Benefit Plan, Assumptions [Table Text Block]	RAP Postretirement RAP Postretirement 2024 2024 2023 2023 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 3.81 % N/A 3.77 % N/A Weighted average assumptions used to determine net periodic benefit costs Discount rate 5.40 % 5.40 % 5.40 % 5.40 % Rate of increase in compensation levels 2.50 % N/A 2.50 % N/A Expected long-term rate of return on plan assets 7.40 % N/A 7.30 % N/A
Schedule of Allocation of Plan Assets [Table Text Block]	The asset allocation for the RAP as of the December 31, 2024 and 2023 measurement dates, respectively, by asset category were as follows: Asset Category 2024 2023 Equity securities 55 % 54 % Fixed-income securities 35 % 34 % Group annuity contracts 8 % 10 % Other 2 % 2 % Total 100 % 100 %
Defined Benefit Plan, Plan Assets, Category [Table Text Block]	Based on these inputs, the following tables summarize the fair value of the RAP’s investments: Fair Value Measurements Using ($ in thousands) December 31, 2024 Level 1 Level 2 Level 3 RAP investments Money market account $ 7,892 $ 7,892 $ — $ — Common /collective trust funds 183,059 183,059 — — Mutual funds 247,602 247,602 — — Group annuity contract 40,416 — — 40,416 Total RAP investments $ 478,970 $ 438,554 $ — $ 40,416 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 contract 43,687 — — 43,687 Total RAP investments $ 453,457 $ 409,771 $ — $ 43,687
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 2024 2023 Fair value of group annuity contract at beginning of period $ 43,687 $ 40,939 Return on plan assets (731) 5,313 Benefits paid (2,539) (2,565) Fair value of group annuity contract at end of period $ 40,416 $ 43,687
Schedule of Expected Benefit Payments [Table Text Block]	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, 2024, reflecting expected future services, were as follows: ($ in thousands) RAP Postretirement Plan Estimated future benefit payments 2025 $ 22,579 $ 217 2026 21,689 213 2027 20,165 208 2028 20,135 203 2029 20,179 196 2030-2034 84,031 856

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The current and deferred amounts of income tax expense (benefit) were as follows: Years Ended December 31, ($ in thousands) 2024 2023 2022 Current Federal $ 38,353 $ 29,319 $ 58,982 State 9,436 5,283 22,092 Total current 47,789 34,602 81,074 Deferred Federal (30,701) (8,371) 12,531 State (5,775) (3,135) (97) Total deferred (36,475) (11,506) 12,434 Total income tax expense $ 11,314 $ 23,097 $ 93,508
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	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, included in other assets and accrued expenses and other liabilities on the consolidated balance sheets, respectively, were as follows: ($ in thousands) December 31, 2024 December 31, 2023 Deferred tax assets Allowance for loan losses $ 89,295 $ 83,378 Allowance for other losses 9,840 8,933 Accrued liabilities 26,109 14,089 Deferred compensation 30,404 28,429 Federal tax credits carryforward 18,160 8,849 Benefit of state tax losses and credit carryforwards 4,187 9,068 Capital loss 29,325 — Nonaccrual interest 1,269 901 Partnerships 37,781 2,365 Lease liability 8,881 6,785 Net unrealized losses on AFS securities 16,228 48,632 Net unrealized losses on pension and postretirement benefits 7,995 8,506 Other 3,353 9,403 Total deferred tax assets $ 282,828 $ 229,338 Valuation allowance for deferred tax assets (32,702) — Total deferred tax assets after valuation allowance $ 250,126 $ 229,338 Deferred tax liabilities Prepaid expenses $ 83,251 $ 66,381 Goodwill 22,376 22,161 Mortgage banking activities 21,877 20,799 Deferred loan fee income 7,836 8,097 State deferred taxes — 1,387 Lease financing 13,213 15,297 Bank premises and equipment 30,534 20,389 Purchase accounting 6,246 7,898 Basis difference from equity securities and other investments 3,104 7,593 Other — 1,207 Total deferred tax liabilities $ 188,437 $ 171,209 Net deferred tax assets $ 61,689 $ 58,129
Summary of Valuation Allowance [Table Text Block]	At December 31, 2024, the valuation allowance for DTAs was related to capital loss carryovers. The changes in the valuation allowance were as follows: ($ in thousands) 2024 2023 Valuation allowance for deferred tax assets, beginning of year $ — $ — (Increase) in current year (32,702) — Valuation allowance for deferred tax assets, end of year $ (32,702) $ —
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows: 2024 2023 2022 Federal income tax rate at statutory rate 21.0 % 21.0 % 21.0 % Increases (decreases) resulting from: Tax-exempt interest and dividends (10.6) % (7.4) % (3.4) % State income taxes (net of federal benefit) 2.2 % 0.3 % 4.2 % Bank owned life insurance (2.1) % (1.1) % (0.5) % Tax effect of tax credits and benefits, net of related expenses (7.9) % (4.7) % (1.6) % Net tax (benefit) from stock-based compensation (0.2) % — % (0.2) % Net tax (benefit) of portfolio reallocation and legal entity rationalization plan (a) (25.7) % — % — % Changes in valuation allowance 24.3 % — % — % FDIC premium 4.8 % 3.0 % 0.7 % Other nondeductible expenses 2.3 % — % — % Changes in unrecognized tax benefits 0.4 % — % — % Prior year return to provision (0.5) % — % — % Other 0.4 % 0.1 % 0.1 % Effective income tax rate 8.4 % 11.2 % 20.3 %
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	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) 2024 2023 Balance at beginning of year $ 2,227 $ 2,233 Changes for tax positions related to prior years 83 (441) Changes for tax positions related to current year 462 435 Balance at end of year $ 2,772 $ 2,227

Derivative and Hedging Activiti

Derivative and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other Derivative Instruments Not Designated As Hedging Instruments [Table Text Block]	December 31, 2024 December 31, 2023 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 (a) $ 1,950,000 $ 2,960 $ 1,150,000 $ 2,976 $ 2,300,000 $ 8,075 $ 550,000 $ 930 Foreign currency exchange forwards 127,518 2,457 216,665 563 231,566 632 189,212 2,946 Total designated as hedging instruments 5,418 3,539 8,707 3,876 Not designated as hedging instruments: Interest rate-related and other instruments 3,858,867 88,541 6,992,894 170,928 3,603,513 111,623 6,528,471 195,662 Foreign currency exchange forwards 68,028 4,315 74,199 4,106 87,526 2,954 135,654 2,746 Mortgage banking (b)(c) 28,580 580 85,000 — 29,490 439 51,500 673 Total not designated as hedging instruments 93,436 175,034 115,016 199,082 Gross derivatives before netting 98,854 178,573 123,723 202,958 Less: Legally enforceable master netting agreements 12,667 12,667 18,234 18,234 Less: Cash collateral pledged/received 35,190 250 35,855 — Total derivative instruments, after netting $ 50,997 $ 165,656 $ 69,634 $ 184,724 (a) The notional amounts of the interest rate-related instruments designated as hedging instruments include forward starting interest rate swaps with an effective date ranging from February 1, 2025 to March 1, 2025. The asset notional amount and fair value on such swaps were $100 million and approximately $333,000, respectively. The liability notional amount and fair value on such swaps were $300 million and $1 million, respectively. (b) 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. (c) At December 31, 2024, the mortgage derivative asset included approximately $254,000 of forward commitments fair value.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The following table presents amounts that were recorded on the consolidated balance sheets related to cumulative basis adjustments for fair value hedges: Line Item in the Consolidated Balance Sheets in Which the Hedged Item is Included Carrying Amount of the Hedged Assets/(Liabilities) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Carrying Amount of the Hedged Assets/(Liabilities) (a) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) ($ in thousands) December 31, 2024 December 31, 2023 Other long-term funding $ (296,004) $ 3,996 $ (548,634) $ 1,366 FHLB Advances (592,256) 7,744 (590,287) 9,713 Total $ (888,260) $ 11,740 $ (1,138,921) $ 11,079
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: Location and Amount Recognized on the Consolidated Statements of Income in Fair Value and Cash Flow Hedging Relationships For the Years Ended December 31, 2024 2023 2022 ($ in thousands) Interest Income Interest Expense Interest Income Interest Expense Loss on Mortgage Portfolio Sale Interest Income Interest Expense 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) $ (16,695) $ 19,189 $ (14,176) $ 17,536 $ (125) $ (263) $ 334 The effects of fair value and cash flow hedging: Impact on fair value hedging relationships in Subtopic 815-20 Interest contracts: Hedged items (217) (661) (245) 5,084 (125) (529) (16,163) Derivatives designated as hedging instruments (a) (16,478) 19,850 (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, 2024 2023 2022 ($ 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 $ (3) $ — $ (9) The effects of fair value hedging: Impact on fair value hedging relationships in Subtopic 815-20 Foreign currency contracts: Hedged items (31,226) 9,322 (26,686) Derivatives designated as hedging instruments 31,223 (9,322) 26,677
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 Years Ended December 31, ($ in thousands) 2024 2023 2022 Interest rate-related instruments designated as cash flow hedging instruments Amount of (loss) income recognized in OCI on cash flow hedge derivative (a) $ (21,537) $ (13,254) $ 3,626 Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest income (a) 16,478 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: Consolidated Statements of Income Category of For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Derivative Instruments Interest rate-related and other instruments — customer and mirror, net Capital markets, net $ (133) $ 392 $ 515 Interest rate-related instruments — MSRs hedge Mortgage banking, net (6,531) (1,096) (12,622) Foreign currency exchange forwards Capital markets, net (371) 1,670 203 Commodity contracts Capital markets, net — — (16) Interest rate lock commitments (mortgage) Mortgage banking, net (113) 353 (2,531) Forward commitments (mortgage) Mortgage banking, net 927 (627) (123)

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2024
Offsetting [Abstract]
Offsetting Assets [Table Text Block]	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 these tables: 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, 2024 $ 79,807 $ (12,667) $ (35,190) $ 31,950 $ (31,950) $ — December 31, 2023 87,075 (18,234) (35,855) 32,985 (32,985) — 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, 2024 $ 14,369 $ (12,667) $ (250) $ 1,452 $ — $ 1,452 December 31, 2023 18,767 (18,234) — 533 — 533
Offsetting Liabilities [Table Text Block]	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 these tables: 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, 2024 $ 79,807 $ (12,667) $ (35,190) $ 31,950 $ (31,950) $ — December 31, 2023 87,075 (18,234) (35,855) 32,985 (32,985) — 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, 2024 $ 14,369 $ (12,667) $ (250) $ 1,452 $ — $ 1,452 December 31, 2023 18,767 (18,234) — 533 — 533

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2024
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, 2024 December 31, 2023 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 11,173,438 $ 11,170,147 Commercial letters of credit (a) 875 3,697 Standby letters of credit (c) 253,709 212,029 (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, 2024 or 2023. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 13. (c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $3 million and $2 million at December 31, 2024 and 2023, respectively, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in thousands) Year Ended December 31, 2024 Year Ended December 31, 2023 Allowance for unfunded commitments Balance at beginning of period $ 34,776 $ 38,776 Provision for unfunded commitments 4,000 (4,000) Balance at end of period $ 38,776 $ 34,776

Parent Company Only Financial_2

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2024
Condensed Financial Information Disclosure [Abstract]
Parent Company Balance Sheet	Balance Sheets December 31, ($ in thousands) 2024 2023 Assets Cash and due from banks $ 36,158 $ 22,473 Interest-bearing deposits in other financial institutions 212,943 20,428 Notes and interest receivable from subsidiaries 710,126 562,640 Investments in and receivable due from subsidiaries 4,455,525 4,080,536 Other assets 57,649 48,589 Total assets $ 5,472,402 $ 4,734,666 Liabilities and Stockholders' Equity Senior notes, at par $ 300,000 $ — Subordinated notes, at par 550,000 550,000 Long-term funding capitalized costs and fair value hedge liability (12,660) (9,114) Total long-term funding 837,340 540,886 Accrued expenses and other liabilities 29,500 19,807 Total liabilities 866,841 560,693 Preferred equity 194,112 194,112 Common equity 4,411,450 3,979,861 Total stockholders’ equity 4,605,562 4,173,973 Total liabilities and stockholders’ equity $ 5,472,402 $ 4,734,666
Parent Company Income Statement	Statements of Income For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Income Income from subsidiaries $ 129,224 $ 192,559 $ 373,581 Interest income on notes receivable from subsidiaries 42,834 30,363 5,632 Other income 1,310 1,175 1,262 Total income 173,368 224,097 380,475 Expense Interest expense on short and long-term funding 45,781 36,081 10,655 Other expense 6,727 7,352 6,118 Total expense 52,508 43,434 16,772 Income before income tax expense 120,860 180,663 363,702 Income tax (benefit) (2,286) (2,292) (2,420) Net income 123,145 182,956 366,122 Preferred stock dividends 11,500 11,500 11,500 Net income available to common equity $ 111,645 $ 171,456 $ 354,622
Parent Company Statement of Cash Flows	Statements of Cash Flows For the Years Ended December 31, ($ in thousands) 2024 2023 2022 Cash Flows from Operating Activities Net income $ 123,145 $ 182,956 $ 366,122 Adjustments to reconcile net income to net cash provided by operating activities: Decrease (increase) in equity in undistributed net income (loss) of subsidiaries 55,776 107,441 (343,582) Net change in other assets and accrued expenses and other liabilities 12,059 (35,863) 14,159 Net cash provided by operating activities 190,980 254,534 36,699 Cash Flows from Investing Activities Net (increase) in investment in subsidiary (331,023) — — Net (increase) decrease in notes receivable from subsidiaries (145,000) (385,000) 115,000 Net cash (used in) provided by investing activities (476,023) (385,000) 115,000 Cash Flows from Financing Activities Net (decrease) in commercial paper — (20,798) (13,932) Proceeds from issuance of long-term funding 297,864 292,740 — Proceeds from issuance of common stock 331,023 — — Proceeds from issuance of common stock for stock-based compensation plans 37,576 4,297 11,061 Purchase of treasury stock, open market purchases (18,289) — — Purchase of treasury stock, stock-based compensation plans (6,234) (6,593) (6,480) Cash dividends on common stock (139,197) (129,534) (123,137) Cash dividends on preferred stock (11,500) (11,500) (11,500) Other — — (938) Net cash provided by (used in) financing activities 491,243 128,612 (144,928) Net increase (decrease) in cash and cash equivalents 206,200 (1,854) 6,771 Cash and cash equivalents at beginning of year 42,901 44,755 37,984 Cash and cash equivalents at end of year $ 249,101 $ 42,901 $ 44,755

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The tables below present the Corporation’s financial instruments measured at fair value on a recurring basis and carrying amounts and estimated fair values of certain financial instruments, aggregated by the level in the fair value hierarchy within which those measurements fall: December 31, 2024 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Assets Cash and due from banks $ 544,059 $ 544,059 $ 544,059 $ — $ — Interest-bearing deposits in other financial institutions 453,590 453,590 453,590 — — Federal funds sold and securities purchased under agreements to resell 21,955 21,955 21,955 — — AFS investment securities: Obligations of state and political subdivisions (municipal securities) 3,005 3,005 — 3,005 — Residential mortgage-related securities: FNMA / FHLMC 110,928 110,928 — 110,928 — GNMA 4,227,727 4,227,727 — 4,227,727 — Commercial mortgage-related securities: FNMA / FHLMC 17,000 17,000 — 17,000 — GNMA 111,475 111,475 — 111,475 — Asset backed securities: FFELP 107,839 107,839 — 107,839 — SBA 471 471 — 471 — Other debt securities 2,989 2,989 — 2,989 — Total AFS investment securities 4,581,434 4,581,434 — 4,581,434 — HTM investment securities: U.S. Treasury securities 1,000 999 999 — — Obligations of state and political subdivisions (municipal securities), net 1,659,662 1,486,582 — 1,486,582 — Residential mortgage-related securities: FNMA / FHLMC 885,476 721,946 — 721,946 — GNMA 43,693 39,927 — 39,927 — Private-label 324,182 266,353 — 266,353 — Commercial mortgage-related securities: FNMA / FHLMC 772,456 623,595 — 623,595 — GNMA 52,219 46,032 — 46,032 — Total HTM investment securities, net 3,738,687 3,185,434 999 3,184,435 — Equity securities: Equity securities 10,742 10,742 10,670 — 72 Equity securities at NAV 12,500 12,500 Total equity securities 23,242 23,242 FHLB and Federal Reserve Bank stocks 179,665 179,665 — 179,665 — Residential loans held for sale 646,687 646,687 — 646,687 — Commercial loans held for sale 32,634 32,634 — 32,634 — Loans, net 29,373,557 28,327,115 — — 28,327,115 Bank and corporate owned life insurance 689,000 689,000 — 689,000 — Mortgage servicing rights, net 87,683 87,683 — — 87,683 Interest rate-related instruments designated as hedging instruments (a) 2,960 2,960 — 2,960 — Foreign currency exchange forwards designated as hedging instruments (a) 2,457 2,457 — 2,457 — Interest rate-related and other instruments not designated as hedging instruments (a) 88,541 88,541 — 88,541 — Foreign currency exchange forwards not designated as hedging instruments (a) 4,315 4,315 — 4,315 — Interest rate lock commitments to originate residential mortgage loans held for sale 327 327 — — 327 Forward commitments to sell residential mortgage loans 254 254 — — 254 Total selected assets at fair value $ 40,471,048 $ 38,871,352 $ 1,031,273 $ 9,412,129 $ 28,415,450 (a) Figures are presented gross before netting. See Note 13 and Note 14 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. December 31, 2024 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Liabilities Deposits: Noninterest-bearing demand $ 5,775,657 $ 5,775,657 $ — $ — $ 5,775,657 Savings 5,133,295 5,133,295 — — 5,133,295 Interest-bearing demand 9,124,741 9,124,741 — — 9,124,741 Money market 6,637,915 6,637,915 — — 6,637,915 Brokered CDs (a) 4,276,309 4,276,309 — 4,276,309 — Other time deposits (a) 3,700,518 3,700,518 — 3,700,518 — Total deposits 34,648,434 34,648,434 — 7,976,827 26,671,607 Federal funds purchased and securities sold under agreements to repurchase 470,369 470,370 — 470,370 — FHLB advances 1,853,807 1,852,685 — 1,852,685 — Other long-term funding 837,635 823,991 — 823,991 — Standby letters of credit (b) 2,546 2,546 — 2,546 — Interest rate-related instruments designated as hedging instruments (c) 2,976 2,976 — 2,976 — Foreign currency exchange forwards designated as hedging instruments (c) 563 563 — 563 — Interest rate-related and other instruments not designated as hedging instruments (c) 170,928 170,928 — 170,928 — Foreign currency exchange forwards not designated as hedging instruments (c) 4,106 4,106 — 4,106 — Total selected liabilities at fair value $ 37,991,364 $ 37,976,599 $ — $ 11,304,992 $ 26,671,607 (a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The commitment on standby letters of credit was $254 million at December 31, 2024. See Note 15 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (c) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place. December 31, 2023 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Assets Cash and due from banks $ 484,384 $ 484,384 $ 484,384 $ — $ — Interest-bearing deposits in other financial institutions 425,089 425,089 425,089 — — Federal funds sold and securities purchased under agreements to resell 14,350 14,350 14,350 — — AFS investment securities: U.S. Treasury securities 35,902 35,902 35,902 — — Obligations of state and political subdivisions (municipal securities) 91,817 91,817 — 91,817 — Residential mortgage-related securities: FNMA / FHLMC 1,120,794 1,120,794 — 1,120,794 — GNMA 2,042,675 2,042,675 — 2,042,675 — Commercial mortgage-related securities: FNMA / FHLMC 16,937 16,937 — 16,937 — GNMA 154,793 154,793 — 154,793 — Asset backed securities: FFELP 133,975 133,975 — 133,975 — SBA 1,051 1,051 — 1,051 — Other debt securities 2,950 2,950 — 2,950 — Total AFS investment securities 3,600,892 3,600,892 35,902 3,564,990 — HTM investment securities: U.S. Treasury securities 999 963 963 — — Obligations of state and political subdivisions (municipal securities), net 1,682,398 1,553,984 — 1,553,984 — Residential mortgage-related securities: FNMA / FHLMC 941,973 804,393 — 804,393 — GNMA 48,979 46,170 — 46,170 — Private-label 345,083 289,507 — 289,507 — Commercial mortgage-related securities: FNMA / FHLMC 780,995 632,914 — 632,914 — GNMA 59,733 52,619 — 52,619 — Total HTM investment securities, net 3,860,160 3,380,550 963 3,379,586 — Equity securities: Equity securities 31,651 31,651 6,883 — 24,769 Equity securities at NAV 10,000 10,000 Total equity securities 41,651 41,651 FHLB and Federal Reserve Bank stocks 229,171 229,171 — 229,171 — Residential loans held for sale 33,011 33,011 — 33,011 — Commercial loans held for sale 90,303 90,303 — 90,303 — Loans, net 28,865,124 27,371,086 — — 27,371,086 Bank and corporate owned life insurance 682,649 682,649 — 682,649 — Mortgage servicing rights, net 84,390 84,390 — — 84,390 Interest rate-related instruments designated as hedging instruments (a) 8,075 8,075 — 8,075 — Foreign currency exchange forwards designated as hedging instruments (a) 632 632 — 632 — Interest rate-related and other instruments not designated as hedging instruments (a) 111,623 111,623 — 111,623 — Foreign currency exchange forwards not designated as hedging instruments (a) 2,954 2,954 — 2,954 — Interest rate lock commitments to originate residential mortgage loans held for sale 439 439 — — 439 Total selected assets at fair value $ 38,534,897 $ 36,561,249 $ 967,570 $ 8,102,995 $ 27,480,684 (a) Figures are presented gross before netting. See Note 13 and Note 14 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. December 31, 2023 ($ in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 Liabilities Deposits: Noninterest-bearing demand $ 6,119,956 $ 6,119,956 $ — $ — $ 6,119,956 Savings 4,835,701 4,835,701 — — 4,835,701 Interest-bearing demand 8,843,967 8,843,967 — — 8,843,967 Money market 6,330,453 6,330,453 — — 6,330,453 Brokered CDs (a) 4,447,479 4,447,479 — 4,447,479 — Other time deposits (a) 2,868,494 2,868,494 — 2,868,494 — Total deposits 33,446,049 33,446,049 — 7,315,973 26,130,076 Federal funds purchased and securities sold under agreements to repurchase 326,780 326,757 — 326,757 — FHLB advances 1,940,194 1,944,600 — 1,944,600 — Other long-term funding 541,269 534,983 — 534,983 — Standby letters of credit (b) 2,157 2,157 — 2,157 — Interest rate-related instruments designated as hedging instruments (c) 930 930 — 930 — Foreign currency exchange forwards designated as hedging instruments (c) 2,946 2,946 — 2,946 — Interest rate-related and other instruments not designated as hedging instruments (c) 195,662 195,662 — 195,662 — Foreign currency exchange forwards not designated as hedging instruments (c) 2,746 2,746 — 2,746 — Forward commitments to sell residential mortgage loans 673 673 — — 673 Total selected liabilities at fair value $ 36,459,407 $ 36,457,504 $ — $ 10,326,755 $ 26,130,749 (a) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (b) The commitment on standby letters of credit was $212 million at December 31, 2023. See Note 15 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments. (c) Figures are presented gross before netting. See Note 13 and Note 14 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the same counterparty where there is a legally enforceable master netting agreement in place.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The table below presents a rollforward of the consolidated balance sheets amounts for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ 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, 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) New production $ 11,771 $ (4,000) $ 15,771 Closed loans / settlements (8,816) 3,512 (12,328) Other (3,068) (438) (2,630) Change in mortgage derivative (113) (927) 814 Balance December 31, 2024 $ 327 $ (254) $ 580
Equity Securities without Readily Determinable Fair Value [Table Text Block]	The following table presents a rollforward of the fair value of Level 3 equity securities that are measured under the measurement alternative, and the related adjustments recorded during the periods presented for those securities with observable price changes: ($ in thousands) Fair value as of December 31, 2022 $ 19,225 Gains recognized in investment securities gains, net 5,861 Purchases 11 Sales (329) Fair value as of December 31, 2023 $ 24,769 Gains recognized in investment securities gains, net $ 4,054 Purchases 22 Sales (28,772) Fair value as of December 31, 2024 $ 72
Fair Value Measurements, Nonrecurring [Table Text Block]	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, 2024 Assets Individually evaluated loans Level 3 $ 31,483 Provision for credit losses $ 17,454 OREO (b) Level 2 276 Other noninterest expense / provision for credit losses (c) 1,067 December 31, 2023 Assets Individually evaluated loans Level 3 $ 47,221 Provision for credit losses $ 45,709 OREO (b) Level 2 3,139 Other noninterest expense / provision for credit losses (c) 2,532 Equity securities without readily determinable fair values Level 3 24,671 Investment securities gains (losses), net 5,785 (a) Includes the full year impact on the consolidated statements of income. (b) 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. (c) 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.
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]	The table below presents the unobservable inputs that are readily quantifiable pertaining to Level 3 measurements: December 31, 2024 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Option adjusted spread 5% - 8% 5% Mortgage servicing rights Discounted cash flow Constant prepayment rate —% - 100% 4% Individually evaluated loans Appraisals / discounted cash flow Collateral / discount factor —% - 77% 61% Interest rate lock commitments to originate residential mortgage loans held for sale Discounted cash flow Closing ratio 55% - 100% 92%

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2024
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 2024 or 2023. 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 , 2024 Associated Banc-Corp Total capital $ 4,282,597 12.61 % $ 2,716,014 ≥ 8.00 % Tier 1 capital 3,590,948 10.58 % 2,037,010 ≥ 6.00 % CET1 3,396,836 10.01 % 1,527,758 ≥ 4.50 % Leverage 3,590,948 8.73 % 1,644,627 ≥ 4.00 % Associated Bank, N.A. Total capital $ 4,078,042 12.03 % $ 2,710,815 ≥ 8.00 % $ 3,388,519 ≥ 10.00 % Tier 1 capital 3,425,721 10.11 % 2,033,111 ≥ 6.00 % 2,710,815 ≥ 8.00 % CET1 3,425,721 10.11 % 1,524,833 ≥ 4.50 % 2,202,537 ≥ 6.50 % Leverage 3,425,721 8.34 % 1,642,484 ≥ 4.00 % 2,053,105 ≥ 5.00 % 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 % (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, 2024
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	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) 2024 2023 2022 Net income $ 123,145 $ 182,956 $ 366,122 Preferred stock dividends (11,500) (11,500) (11,500) Net income available to common equity $ 111,645 $ 171,456 $ 354,622 Common shareholder dividends $ (138,508) $ (128,748) $ (122,417) Unvested share-based payment awards (689) (785) (720) Undistributed earnings $ (27,552) $ 41,922 $ 231,485 Undistributed earnings allocated to common shareholders $ (27,552) $ 41,675 $ 229,995 Undistributed earnings allocated to unvested share-based payment awards — 247 1,490 Undistributed earnings $ (27,552) $ 41,922 $ 231,485 Basic Distributed earnings to common shareholders $ 138,508 $ 128,748 $ 122,417 Undistributed earnings allocated to common shareholders (27,552) 41,675 229,995 Total common shareholders earnings, basic $ 110,956 $ 170,424 $ 352,412 Diluted Distributed earnings to common shareholders $ 138,508 $ 128,748 $ 122,417 Undistributed earnings allocated to common shareholders (27,552) 41,675 229,995 Total common shareholders earnings, diluted $ 110,956 $ 170,424 $ 352,412 Weighted average common shares outstanding 151,933 149,968 149,162 Effect of dilutive common stock awards 1,415 892 1,334 Diluted weighted average common shares outstanding 153,347 150,860 150,496 Basic earnings per common share $ 0.73 $ 1.14 $ 2.36 Diluted earnings per common share $ 0.72 $ 1.13 $ 2.34

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Financial information about the Corporation’s segments is presented below: As of and for the Year Ended December 31, 2024 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services (a) Consolidated Corporation Net segment interest income (expense) $ 976,878 $ 247,791 $ (177,421) $ 1,047,248 Net intersegment interest (expense) income (429,917) 579,587 (149,670) — Net interest income (expense) 546,961 827,378 (327,091) 1,047,248 Noninterest income (expense) 53,435 198,485 (261,327) (9,407) Total income (expense) before provision 600,396 1,025,863 (588,418) 1,037,841 Provision for credit losses 66,390 24,759 (6,163) 84,986 Total income (expense) after provision 534,006 1,001,104 (582,255) 952,855 Noninterest expense Personnel 79,853 232,787 175,316 487,956 Technology (b) 2,594 47,241 57,728 107,563 Occupancy (b) — 61 54,561 54,622 Business development and advertising 3,543 3,169 21,430 28,142 Equipment (b) 2 5,930 12,499 18,431 Legal and professional 825 1,978 18,798 21,601 Loan and foreclosure costs 1,100 5,018 2,353 8,471 FDIC assessment — — 38,439 38,439 Other intangible amortization — — 8,811 8,811 Loss on prepayments of FHLB advances — — 14,243 14,243 Other noninterest expense (income) 3,338 27,921 (1,141) 30,118 Allocated indirect expense (income) 88,036 205,979 (294,015) — Total noninterest expense 179,291 530,084 109,022 818,397 Net income (loss) before income taxes 354,715 471,020 (691,277) 134,459 Income tax expense (benefit) 64,346 97,460 (150,492) 11,314 Net income (loss) $ 290,369 $ 373,560 $ (540,785) $ 123,145 Loans $ 16,959,921 $ 12,318,648 $ 490,017 $ 29,768,586 Allocated goodwill 525,836 579,156 — 1,104,992 Total assets 17,794,372 13,892,891 11,335,805 43,023,068 (a) Unusual items including a $130 million loss on mortgage portfolio sale and a $148 million loss on investment securities as a result of the balance sheet repositioning announced in the fourth quarter of 2024 are included within the noninterest income (expense) caption. (b) A portion of total depreciation expense of approximately $242,000, $10 million, and $39 million for the Corporate and Commercial Specialty, Community Consumer and Business, and Risk Management and Shared Services segments, respectively, is included in this expense caption. As of and for the Year Ended December 31, 2023 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services (a) Consolidated Corporation Net segment interest income (expense) $ 933,929 $ 309,291 $ (203,647) $ 1,039,573 Net intersegment interest (expense) income (432,073) 487,897 (55,824) — Net interest income (expense) 501,856 797,188 (259,471) 1,039,573 Noninterest income (expense) 51,905 193,948 (182,671) 63,182 Total income (expense) before provision 553,761 991,136 (442,142) 1,102,756 Provision for credit losses 54,302 29,757 (1,038) 83,021 Total income (expense) after provision 499,459 961,379 (441,104) 1,019,734 Noninterest expense Personnel 71,688 236,385 160,282 468,355 Technology (b) 2,931 44,661 54,426 102,018 Occupancy (b) — 95 57,109 57,204 Business development and advertising 4,042 4,001 20,362 28,405 Equipment (b) 1 5,770 13,892 19,663 Legal and professional 1,359 1,933 16,619 19,911 Loan and foreclosure costs 877 3,065 1,466 5,408 FDIC assessment — — 67,072 67,072 Other intangible amortization — — 8,811 8,811 Other noninterest expense 3,501 29,800 3,534 36,837 Allocated indirect expense (income) 83,190 191,613 (274,803) — Total noninterest expense 167,589 517,323 128,770 813,682 Net income (loss) before income taxes 331,870 444,056 (569,873) 206,052 Income tax expense (benefit) 59,143 91,770 (127,816) 23,097 Net income (loss) $ 272,727 $ 352,286 $ (442,057) $ 182,956 Loans $ 16,045,897 $ 12,642,123 $ 528,198 29,216,218 Allocated goodwill 525,836 $ 579,156 — 1,104,992 Total assets 16,897,021 13,453,475 10,665,359 41,015,855 (a) Unusual items including a $136 million loss on mortgage portfolio sale and a $65 million loss on investment securities as a result of the balance sheet repositioning announced in the fourth quarter of 2023 are included within the noninterest income (expense) caption and a $31 million FDIC special assessment is included in the FDIC assessment caption. (b) A portion of total depreciation expense of approximately $164,000, $8 million, and $39 million for the Corporate and Commercial Specialty, Community Consumer and Business, and Risk Management and Shared Services segments, respectively, is included in this expense caption. As of and for the Year Ended December 31, 2022 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Net segment interest income $ 526,870 $ 362,420 $ 68,031 $ 957,321 Net intersegment interest (expense) income (118,059) 190,862 (72,803) — Net interest income (expense) 408,811 553,282 (4,772) 957,321 Noninterest income 58,938 205,660 17,772 282,370 Total income before provision 467,749 758,942 12,999 1,239,691 Provision for credit losses 47,939 22,359 (37,300) 32,998 Total income after provision 419,810 736,583 50,299 1,206,693 Noninterest expense Personnel 71,043 238,962 144,096 454,101 Technology (a) 3,029 33,330 54,341 90,700 Occupancy (a) — 82 59,712 59,794 Business development and advertising 3,703 3,428 18,394 25,525 Equipment (a) 1 5,365 14,266 19,632 Legal and professional 1,025 4,209 13,016 18,250 Loan and foreclosure costs 528 4,308 1,089 5,925 FDIC assessment — — 22,650 22,650 Other intangible amortization — — 8,811 8,811 Other noninterest expense 3,350 31,720 6,605 41,675 Allocated indirect expense (income) 73,548 173,645 (247,193) — Total noninterest expense 156,227 495,049 95,787 747,063 Net income (loss) before income taxes 263,583 241,534 (45,488) 459,630 Income tax expense (benefit) 47,440 49,347 (3,279) 93,508 Net income (loss) $ 216,143 $ 192,187 $ (42,209) $ 366,122 Loans $ 17,083,254 $ 11,231,404 $ 484,911 $ 28,799,569 Allocated goodwill 525,836 579,156 — 1,104,992 Total assets 17,909,477 12,073,694 9,422,556 39,405,727 (a) A portion of total depreciation expense of approximately $15,000, $4 million, and $41 million for the Corporate and Commercial Specialty, Community Consumer and Business, and Risk Management and Shared Services segments, respectively, is included in this expense caption.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2024
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), including changes during the years presented 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, 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 benefit (expense) 78,159 (54) 13,495 91,601 Net other comprehensive (loss) income 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) Other comprehensive (loss) income before reclassifications $ (23,978) $ — $ 2,210 $ (21,768) Amounts reclassified from accumulated other comprehensive income (loss): Investment securities losses, net 148,380 — — 148,380 HTM investment securities, net, at amortized cost (a) 8,360 — — 8,360 Other assets / accrued expenses and other liabilities — (21,537) — (21,537) Interest income — 16,478 — 16,478 Personnel expense — — (290) (290) Other expense — — (28) (28) Income tax (expense) benefit (33,114) 710 (511) (32,915) Net other comprehensive income (loss) during period 99,648 (4,348) 1,381 96,681 Balance, December 31, 2024 $ (48,993) $ (1,268) $ (24,154) $ (74,416)

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue Recognition [Abstract]
Disaggregation of Revenue [Table Text Block]	The Corporation's disaggregated revenue by major source is presented below: For the Year Ended December 31, 2024 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Wealth management fees $ — $ 92,569 $ — $ 92,569 Service charges and deposit account fees 11,627 39,977 38 51,642 Card-based fees (a) 1,652 45,287 88 47,027 Other revenue (expense) 315 8,103 (138) 8,280 Noninterest income (loss) (in-scope of Topic 606) $ 13,594 $ 185,936 $ (12) $ 199,518 Noninterest income (loss) (out-of-scope of Topic 606) 39,841 12,549 (261,315) (208,925) Total noninterest income (loss) $ 53,435 $ 198,485 $ (261,327) $ (9,407) (a) Loan fees and certain card based fees are out-of-scope of Topic 606. For the Year Ended December 31, 2023 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Wealth management fees $ — $ 82,502 $ — $ 82,502 Service charges and deposit account fees 10,191 38,831 23 49,045 Card-based fees (a) 1,348 43,745 28 45,121 Other revenue 959 8,168 764 9,891 Noninterest income (in-scope of Topic 606) $ 12,498 $ 173,246 $ 815 $ 186,560 Noninterest income (loss) (out-of-scope of Topic 606) 39,407 20,702 (183,486) (123,377) Total noninterest income (loss) $ 51,905 $ 193,948 $ (182,671) $ 63,182 (a) Loan fees and certain card based fees are out-of-scope of Topic 606. For the Year Ended December 31, 2022 ($ in thousands) Corporate and Commercial Specialty Community, Consumer and Business Risk Management and Shared Services Consolidated Corporation Wealth management fees $ — $ 84,122 $ — $ 84,122 Service charges and deposit account fees 12,479 49,813 18 62,310 Card-based fees (a) 1,104 42,917 111 44,132 Other revenue 1,734 8,299 1,356 11,389 Noninterest income (in-scope of Topic 606) $ 15,317 $ 185,151 $ 1,485 $ 201,953 Noninterest income (out-of-scope of Topic 606) 43,621 20,510 16,286 80,417 Total noninterest income $ 58,938 $ 205,660 $ 17,772 $ 282,370 (a) Loan fees and certain card based fees are out-of-scope of Topic 606.
Long-Duration Contracts Revenue Recognition, Policy [Policy 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)	12 Months Ended
	Dec. 31, 2024
Core Deposits [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
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%
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150%

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) branch	Dec. 31, 2023 USD ($) branch	Dec. 31, 2022 branch
Business Acquisition [Line Items]
Number of Businesses Acquired | branch	0	0	0
Number of branches sold in disposition | branch	0	0
Deposits | $	$ 34,648,434	$ 33,446,049
Loans and Leases Receivable, Net of Deferred Income | $	$ 29,768,586	$ 29,216,218

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	$ 4,605,954	$ 3,749,814
Debt Securities, Available-for-Sale, Unrealized Gain	5,693	24,579
Debt Securities, Available-for-sale, Unrealized Loss	(30,213)	(173,501)
Debt Securities, Available-for-sale	4,581,434	3,600,892
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,747	3,860,235
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	42,653	55,619
Held-to-maturity, Gross Unrealized Loss	(595,906)	(535,230)
Debt Securities, Held-to-Maturity, Fair Value	3,185,494	3,380,624
US Treasury Securities [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost		39,984
Debt Securities, Available-for-Sale, Unrealized Gain		0
Debt Securities, Available-for-sale, Unrealized Loss		(4,083)
Debt Securities, Available-for-sale		35,902
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	0	0
Held-to-maturity, Gross Unrealized Loss	(1)	(36)
Debt Securities, Held-to-Maturity, Fair Value	999	963
US States and Political Subdivisions Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	3,063	94,008
Debt Securities, Available-for-Sale, Unrealized Gain	0	23
Debt Securities, Available-for-sale, Unrealized Loss	(58)	(2,214)
Debt Securities, Available-for-sale	3,005	91,817
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,659,722	1,682,473
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	1,122	5,638
Held-to-maturity, Gross Unrealized Loss	(174,202)	(134,053)
Debt Securities, Held-to-Maturity, Fair Value	1,486,642	1,554,059
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	120,272	1,274,052
Debt Securities, Available-for-Sale, Unrealized Gain	190	294
Debt Securities, Available-for-sale, Unrealized Loss	(9,534)	(153,552)
Debt Securities, Available-for-sale	110,928	1,120,794
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	22,934	27,007
Held-to-maturity, Gross Unrealized Loss	(186,464)	(164,587)
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	4,236,199	2,021,242
Debt Securities, Available-for-Sale, Unrealized Gain	5,379	24,254
Debt Securities, Available-for-sale, Unrealized Loss	(13,851)	(2,822)
Debt Securities, Available-for-sale	4,227,727	2,042,675
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	9	92
Held-to-maturity, Gross Unrealized Loss	(3,774)	(2,901)
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	18,332	18,691
Debt Securities, Available-for-Sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(1,332)	(1,755)
Debt Securities, Available-for-sale	17,000	16,937
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	10,217	12,699
Held-to-maturity, Gross Unrealized Loss	(159,078)	(160,781)
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	116,275	161,928
Debt Securities, Available-for-Sale, Unrealized Gain	0	0
Debt Securities, Available-for-sale, Unrealized Loss	(4,800)	(7,135)
Debt Securities, Available-for-sale	111,475	154,793
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	236	386
Held-to-maturity, Gross Unrealized Loss	(6,424)	(7,500)
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
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
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	324,182	345,083
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	8,135	9,796
Held-to-maturity, Gross Unrealized Loss	(65,963)	(65,372)
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	108,319	135,832
Debt Securities, Available-for-Sale, Unrealized Gain	123	5
Debt Securities, Available-for-sale, Unrealized Loss	(604)	(1,862)
Debt Securities, Available-for-sale	107,839	133,975
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
AFS investment securities
Debt Securities, Available-for-Sale, Amortized Cost	495	1,077
Debt Securities, Available-for-Sale, Unrealized Gain	0	2
Debt Securities, Available-for-sale, Unrealized Loss	(24)	(28)
Debt Securities, Available-for-sale	471	1,051
HTM investment securities
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
Other Debt Obligations [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	(11)	(50)
Debt Securities, Available-for-sale	$ 2,989	$ 2,950

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 1,000
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	3,040
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,390
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	633
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	6,063
Debt Securities, Available-for-Sale, Amortized Cost, Total	4,605,954	$ 3,749,814
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	997
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	3,026
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,387
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	585
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	5,994
Total debt securities, AFS Fair Value	$ 4,581,434	3,600,892
Ratio of Fair Value to Amortized Cost, AFS	99.50%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 17,800
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	62,054
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	187,803
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,393,065
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,660,722
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,747	3,860,235
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	17,746
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	61,286
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	179,653
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,228,957
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	1,487,641
Debt Securities, Held-to-Maturity, Fair Value	$ 3,185,494	3,380,624
Ratio of Fair Value to Amortized Cost, HTM	85.20%
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 120,272	1,274,052
Fair Value
Total debt securities, AFS Fair Value	110,928	1,120,794
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	4,236,199	2,021,242
Fair Value
Total debt securities, AFS Fair Value	4,227,727	2,042,675
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
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	324,182	345,083
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	18,332	18,691
Fair Value
Total debt securities, AFS Fair Value	17,000	16,937
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	116,275	161,928
Fair Value
Total debt securities, AFS Fair Value	111,475	154,793
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	108,319	135,832
Fair Value
Total debt securities, AFS Fair Value	107,839	133,975
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	495	1,077
Fair Value
Total debt securities, AFS Fair Value	471	$ 1,051
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, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 3,738,747	$ 3,860,235
Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	4,221	1,155
Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	2,846,177	2,938,090
Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	883,438	915,303
Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	4,911	5,687
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
US Treasury Securities [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
US Treasury Securities [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
US Treasury Securities [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
US Treasury Securities [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,659,722	1,682,473
US States and Political Subdivisions Debt Securities [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	4,221	1,155
US States and Political Subdivisions Debt Securities [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	767,151	760,329
US States and Political Subdivisions Debt Securities [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	883,438	915,303
US States and Political Subdivisions Debt Securities [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	4,911	5,687
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	324,182	345,083
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	324,182	345,083
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Not Rated [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Fitch, AAA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Fitch, AA Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] | Fitch, A Rating [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 0	$ 0

Investment Securities, Gains, L

Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-Sale, Realized Gain	$ 0	$ 83	$ 21
Debt Securities, Available-for-Sale, Realized Loss	(148,380)	(65,022)	(1,943)
Gain on sale and net write-up of equity securities	4,233	6,037	5,668
Debt Securities, Realized Gain (Loss)	(144,147)	(58,903)	3,746
Proceeds from Sale and Maturity of Marketable Securities	$ 1,141,231	$ 715,066	$ 110,177

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) 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	141	82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (14,323)	$ (4,773)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,694,159	$ 307,527
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	54	213
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (15,890)	$ (168,728)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	259,134	1,392,635
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(30,213)	(173,501)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,953,294	1,700,162
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(13,665)	(2,184)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	529,064	220,865
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(582,241)	(533,046)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	2,519,595	2,566,468
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(595,906)	(535,230)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	3,048,660	$ 2,787,333
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
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		$ (4,083)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		35,902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		(4,083)
Debt Securities, Available-for-sale, Unrealized Loss Position		35,902
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	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	(36)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	999	963
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(1)	(36)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 999	$ 963
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	1	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (3)	$ (347)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 542	$ 23,762
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	2	92
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (55)	$ (1,867)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	828	53,022
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(58)	(2,214)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,370	76,784
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(11,860)	(1,535)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	483,073	180,270
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(162,343)	(132,518)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	866,949	792,940
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(174,202)	(134,053)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	1,350,022	973,210
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	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(65,963)	(65,372)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	266,353	289,507
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(65,963)	(65,372)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 266,353	$ 289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [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	12	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (604)	$ (1,862)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	62,830	125,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(604)	(1,862)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 62,830	$ 125,339
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	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	4	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (24)	$ (28)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	464	761
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(24)	(28)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 464	$ 761
Other Debt Obligations [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	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (7)	$ (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 993	$ 991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (3)	$ (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	997	1,958
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(11)	(50)
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,989	$ 2,950
US Government Sponsored-Enterprise Insured Loans [Member] | Residential 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	23	18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (607)	$ (333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 31,983	$ 22,870
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	14	71
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (8,927)	$ (153,219)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	61,596	1,080,337
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(9,534)	(153,552)
Debt Securities, Available-for-sale, Unrealized Loss Position	93,579	1,103,207
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(280)	(511)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	11,617	30,323
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(186,184)	(164,076)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	710,114	771,042
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(186,464)	(164,587)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 721,732	$ 801,365
US Government Sponsored-Enterprise Insured Loans [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	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	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (1,332)	$ (1,755)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,000	16,937
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,332)	(1,755)
Debt Securities, Available-for-sale, Unrealized Loss Position	17,000	16,937
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,343)	(121)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	25,518	8,144
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(157,735)	(160,660)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	598,077	624,770
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(159,078)	(160,781)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 623,595	$ 632,914
Government National Mortgage Association (GNMA) [Member] | Residential 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	116	13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (13,706)	$ (924)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,660,642	$ 156,847
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	4	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (145)	$ (1,898)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,945	26,643
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(13,851)	(2,822)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,664,587	183,490
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(183)	(17)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	8,856	2,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,591)	(2,884)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	31,071	34,626
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(3,774)	(2,901)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 39,927	$ 36,754
Government National Mortgage Association (GNMA) [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	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ (3,160)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 103,055
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security	16	22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ (4,800)	$ (3,975)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	111,475	51,738
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(4,800)	(7,135)
Debt Securities, Available-for-sale, Unrealized Loss Position	111,475	154,793
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	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(6,424)	(7,500)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	46,032	52,619
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(6,424)	(7,500)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	$ 46,032	$ 52,619
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	391	205
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	0
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	370	182
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	0
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Residential 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	12	20
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | US Government Sponsored-Enterprise Insured Loans [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	2	1
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | Government National Mortgage Association (GNMA) [Member] | Residential 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	7	2
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member] | Government National Mortgage Association (GNMA) [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	0	0
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	901	785
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	1
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	641	537
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	18
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | US Government Sponsored-Enterprise Insured Loans [Member] | Residential 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	106	94
Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member] | US Government Sponsored-Enterprise Insured Loans [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	43	44
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) [Member] | Residential 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	79	78
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) [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	13	13

Investment Securities (Details

Investment Securities (Details Textual) - USD ($) shares in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investment Securities Information [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 1,100,000,000		$ 715,000,000		$ 1,141,231,000	$ 715,066,000	$ 110,177,000
Gain (Loss) on Sale of Investments					148,000,000	65,000,000
Visa B Shares, Amount Sold			1
Debt Instrument, Collateral Amount	1,500,000,000		$ 1,600,000,000		1,500,000,000	1,600,000,000
Interest Receivable	167,772,000		169,569,000		167,772,000	169,569,000
Held to maturity allowance for credit loss	(60,000)		(75,000)		(60,000)	(75,000)
Federal Home Loan Bank Stock	92,000,000		143,000,000		92,000,000	143,000,000
Federal Reserve Bank Stock	88,000,000		87,000,000		88,000,000	87,000,000
Equity Securities with Readily Determined Fair Value	11,000,000		7,000,000		11,000,000	7,000,000
Equity Securities without Readily Determinable Fair Value, Amount	13,000,000		35,000,000		13,000,000	35,000,000
Held-to-Maturity Securities [Member]
Schedule of Investment Securities Information [Line Items]
Interest Receivable	18,000,000		18,000,000		18,000,000	18,000,000
Available-for-sale Securities [Member]
Schedule of Investment Securities Information [Line Items]
Gain (Loss) on Sale of Investments	(148,000,000)		(65,000,000)
Interest Receivable	21,000,000		15,000,000		21,000,000	15,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Schedule of Investment Securities Information [Line Items]
Interest Receivable	2,000,000		4,000,000		2,000,000	4,000,000
US States and Political Subdivisions Debt Securities [Member]
Schedule of 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
Schedule of Investment Securities Information [Line Items]
Gain (Loss) on Sale of Investments		$ 4,000,000	6,000,000
Federal Reserve Bank Stock [Member]
Schedule of Investment Securities Information [Line Items]
Interest Receivable	0		0		0	0
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Investment Securities Information [Line Items]
Held to maturity allowance for credit loss	0		0		0	0
US Treasury Securities [Member]
Schedule of Investment Securities Information [Line Items]
Held to maturity allowance for credit loss	0		0		0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of 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, 2024	Dec. 31, 2023
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 29,768,586	$ 29,216,218
Commercial and Industrial Sector [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,573,741	9,731,555
Commercial Real Estate Owner Occupied Portfolio [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,143,741	1,061,700
Commercial And Business Lending [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,717,483	10,793,255
Commercial Real Estate Investor Portfolio Segment [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,227,975	5,124,245
Construction Loans [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,982,632	2,271,398
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,210,607	7,395,644
Commercial Portfolio Segment [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,928,090	18,188,898
Residential Mortgage [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,047,541	7,864,891
Automobile Loan [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,810,220	2,256,162
Home Equity Line of Credit [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	664,252	628,526
Other Consumer [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	318,483	277,740
Consumer Portfolio Segment [Member]
Loans and Leases Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 10,840,496	$ 11,027,319

Loans, Related Party Loan Rollf

Loans, Related Party Loan Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans and Leases Receivable, Related Parties, Beginning Balance	$ 5,406	$ 3,376
Loans and Leases Receivable, Related Parties, Additions	17,395	2,564
Loans and Leases Receivable, Related Parties, Proceeds	(2,359)	(253)
Change Due To Status of Officers And Directors	838	(280)
Loans and Leases Receivable, Related Parties, Ending Balance	$ 21,280	$ 5,406

Loans, Credit Quality Indicator

Loans, Credit Quality Indicator by Vintage Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 13,183	$ 18,966
Financing Receivable, Revolving	2,981,010	2,712,389
Financing Receivable, Year One, Originated, Current Fiscal Year	6,227,743	5,363,890
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,280,254	8,307,956
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,136,344	6,039,862
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,086,483	2,556,071
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,945,455	1,578,023
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,111,296	2,658,026
Financing Receivable, before Allowance for Credit Loss, Total	29,768,586	29,216,218
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	11,082	9,068
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	7,183	1,535
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	14,697	14,224
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	14,300	26,093
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	28,283	6,237
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	209	130
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	662	1,482
Financing Receivable, Allowance for Credit Loss, Writeoff	76,415	58,768
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	9,320	10,204
Financing Receivable, Revolving	2,887,188	2,604,690
Financing Receivable, Year One, Originated, Current Fiscal Year	5,928,329	5,206,038
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,178,435	8,093,062
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,680,015	5,886,359
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,859,616	2,511,435
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,922,456	1,537,747
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,041,886	2,556,674
Financing Receivable, before Allowance for Credit Loss, Total	28,497,925	28,396,005
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	127	205
Financing Receivable, Revolving	50,036	23,595
Financing Receivable, Year One, Originated, Current Fiscal Year	92,851	8,893
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	12,396	74,020
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	191,587	41,091
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	28,101	6,213
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,385	29,882
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,701	33,089
Financing Receivable, before Allowance for Credit Loss, Total	396,057	216,784
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,015	814
Financing Receivable, Revolving	43,602	83,872
Financing Receivable, Year One, Originated, Current Fiscal Year	190,993	131,753
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	79,035	112,289
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	235,110	68,695
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	182,313	27,253
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,103	3,387
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,189	27,183
Financing Receivable, before Allowance for Credit Loss, Total	751,344	454,432
Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,721	7,744
Financing Receivable, Revolving	185	231
Financing Receivable, Year One, Originated, Current Fiscal Year	15,570	17,206
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10,389	28,584
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	29,632	43,718
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	16,453	11,170
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,512	7,007
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	42,519	41,080
Financing Receivable, before Allowance for Credit Loss, Total	123,260	148,997
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,306	8,598
Financing Receivable, Revolving	2,166,104	1,991,827
Financing Receivable, Year One, Originated, Current Fiscal Year	4,794,949	3,781,028
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,902,201	5,687,614
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,860,631	3,835,298
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,376,387	1,127,677
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	738,576	917,114
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,089,243	848,341
Financing Receivable, before Allowance for Credit Loss, Total	18,928,090	18,188,898
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,433	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	6,745	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	11,485	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	8,510	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	27,528	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	3	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	3	295
Financing Receivable, Allowance for Credit Loss, Writeoff	58,707	45,989
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	248	1,380
Financing Receivable, Revolving	2,076,092	1,887,058
Financing Receivable, Year One, Originated, Current Fiscal Year	4,499,360	3,626,800
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,805,832	5,489,219
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,422,105	3,691,830
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,160,547	1,093,633
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	724,088	884,162
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,062,831	788,529
Financing Receivable, before Allowance for Credit Loss, Total	17,750,855	17,461,232
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	48,829	22,552
Financing Receivable, Year One, Originated, Current Fiscal Year	92,469	8,265
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	11,692	72,084
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	190,504	40,882
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	27,916	6,164
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,385	29,772
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,217	32,648
Financing Receivable, before Allowance for Credit Loss, Total	392,012	212,368
Commercial Portfolio Segment [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,015	804
Financing Receivable, Revolving	41,183	82,216
Financing Receivable, Year One, Originated, Current Fiscal Year	190,399	131,253
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	78,708	112,123
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	235,033	68,695
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	182,313	27,253
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,103	3,180
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,165	27,157
Financing Receivable, before Allowance for Credit Loss, Total	747,903	451,876
Commercial Portfolio Segment [Member] | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	42	6,414
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	12,721	14,710
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,969	14,188
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,988	33,891
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,612	627
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	30	6
Financing Receivable, before Allowance for Credit Loss, Total	37,320	63,422
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,306	8,598
Financing Receivable, Revolving	1,930,860	1,796,951
Financing Receivable, Year One, Originated, Current Fiscal Year	2,752,002	1,764,466
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,533,233	2,977,719
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,365,866	1,914,057
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,214,154	419,934
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	267,148	383,789
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	510,480	474,638
Financing Receivable, before Allowance for Credit Loss, Total	10,573,741	9,731,555
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,433	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	128	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	11,484	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	8,510	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	22,959	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	3	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	18
Financing Receivable, Allowance for Credit Loss, Writeoff	47,517	45,687
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	248	1,380
Financing Receivable, Revolving	1,841,790	1,693,249
Financing Receivable, Year One, Originated, Current Fiscal Year	2,656,953	1,736,617
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,514,277	2,877,173
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,254,758	1,824,362
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,080,180	398,046
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	263,286	383,695
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	510,301	449,006
Financing Receivable, before Allowance for Credit Loss, Total	10,121,545	9,362,149
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	48,829	21,779
Financing Receivable, Year One, Originated, Current Fiscal Year	4,037	4,017
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,810	46,610
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	63,390	8,525
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,984	3,529
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	515	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	48	25,341
Financing Receivable, before Allowance for Credit Loss, Total	128,613	109,801
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,015	804
Financing Receivable, Revolving	40,240	81,924
Financing Receivable, Year One, Originated, Current Fiscal Year	90,240	10,515
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	9,677	39,748
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	34,730	47,279
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	126,134	17,732
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,347	94
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	131	291
Financing Receivable, before Allowance for Credit Loss, Total	304,500	197,582
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	42	6,414
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	772	13,317
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,468	14,188
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,988	33,891
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	855	627
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
Financing Receivable, before Allowance for Credit Loss, Total	19,084	62,022
Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	14,703	15,957
Financing Receivable, Year One, Originated, Current Fiscal Year	231,446	220,168
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	187,066	190,794
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	181,625	251,783
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	223,557	147,708
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	117,435	138,816
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	187,911	96,473
Financing Receivable, before Allowance for Credit Loss, Total	1,143,741	1,061,700
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	3	0
Financing Receivable, Allowance for Credit Loss, Writeoff	3	25
Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	13,760	15,393
Financing Receivable, Year One, Originated, Current Fiscal Year	228,913	204,039
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	175,059	188,003
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	180,132	239,218
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	214,237	136,535
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	114,064	135,730
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	181,982	92,339
Financing Receivable, before Allowance for Credit Loss, Total	1,108,147	1,011,259
Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	271
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	497	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	6,150
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	8,619	2,635
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,803	1,293
Financing Receivable, before Allowance for Credit Loss, Total	11,920	10,349
Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	943	292
Financing Receivable, Year One, Originated, Current Fiscal Year	2,532	14,735
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10,009	2,791
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,492	6,416
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	701	8,537
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,371	3,086
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,125	2,841
Financing Receivable, before Allowance for Credit Loss, Total	22,173	38,699
Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied Portfolio [Member] | 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	1,394
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,501	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	0	0
Financing Receivable, before Allowance for Credit Loss, Total	1,501	1,394
Commercial Portfolio Segment [Member] | Commercial And Business Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,306	8,598
Financing Receivable, Revolving	1,945,563	1,812,909
Financing Receivable, Year One, Originated, Current Fiscal Year	2,983,447	1,984,635
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,720,298	3,168,514
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,547,491	2,165,840
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,437,710	567,642
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	384,583	522,606
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	698,390	571,111
Financing Receivable, before Allowance for Credit Loss, Total	11,717,483	10,793,255
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	4,433	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	128	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	11,484	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	8,510	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	22,959	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	3	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	3	18
Financing Receivable, Allowance for Credit Loss, Writeoff	47,520	45,713
Commercial Portfolio Segment [Member] | Commercial And Business Lending [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	248	1,380
Financing Receivable, Revolving	1,855,550	1,708,642
Financing Receivable, Year One, Originated, Current Fiscal Year	2,885,866	1,940,657
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,689,336	3,065,177
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,434,891	2,063,580
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,294,416	534,581
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	377,350	519,426
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	692,283	541,345
Financing Receivable, before Allowance for Credit Loss, Total	11,229,693	10,373,408
Commercial Portfolio Segment [Member] | Commercial And Business Lending [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	48,829	22,050
Financing Receivable, Year One, Originated, Current Fiscal Year	4,037	4,017
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,307	46,610
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	63,390	14,675
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	15,604	6,164
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	515	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,852	26,634
Financing Receivable, before Allowance for Credit Loss, Total	140,532	120,150
Commercial Portfolio Segment [Member] | Commercial And Business Lending [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,015	804
Financing Receivable, Revolving	41,183	82,216
Financing Receivable, Year One, Originated, Current Fiscal Year	92,772	25,250
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	19,686	42,539
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	36,222	53,695
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	126,835	26,269
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,719	3,180
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,255	3,132
Financing Receivable, before Allowance for Credit Loss, Total	326,673	236,281
Commercial Portfolio Segment [Member] | Commercial And Business Lending [Member] | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	42	6,414
Financing Receivable, Revolving	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year	772	14,710
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,969	14,188
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,988	33,891
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	855	627
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
Financing Receivable, before Allowance for Credit Loss, Total	20,585	63,416
Commercial Portfolio Segment [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	190,451	155,611
Financing Receivable, Year One, Originated, Current Fiscal Year	1,485,088	1,374,116
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	785,058	1,342,492
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,303,690	1,121,633
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	751,786	472,355
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	328,338	388,768
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	383,563	269,269
Financing Receivable, before Allowance for Credit Loss, Total	5,227,975	5,124,245
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	6,617	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	1	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	4,569	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	252
Financing Receivable, Allowance for Credit Loss, Writeoff	11,187	252
Commercial Portfolio Segment [Member] | Commercial Real Estate Investor Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	190,451	155,109
Financing Receivable, Year One, Originated, Current Fiscal Year	1,334,740	1,263,866
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	725,652	1,247,434
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,179,867	1,080,425
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	723,994	471,371
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	321,084	358,996
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	363,288	239,230
Financing Receivable, before Allowance for Credit Loss, Total	4,839,076	4,816,433
Commercial Portfolio Segment [Member] | Commercial Real Estate Investor Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	502
Financing Receivable, Year One, Originated, Current Fiscal Year	69,014	4,248
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,385	25,474
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	30,672	26,208
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12,312	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,870	29,772
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	10,366	6,014
Financing Receivable, before Allowance for Credit Loss, Total	135,618	92,218
Commercial Portfolio Segment [Member] | Commercial Real Estate Investor Portfolio Segment [Member] | Substandard
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	69,385	106,002
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	53,022	69,584
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	93,151	15,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,724	983
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	384	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,910	24,025
Financing Receivable, before Allowance for Credit Loss, Total	236,576	215,595
Commercial Portfolio Segment [Member] | Commercial Real Estate Investor Portfolio Segment [Member] | 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	11,949
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	4,757
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, before Allowance for Credit Loss, Total	16,705
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	30,090	23,307
Financing Receivable, Year One, Originated, Current Fiscal Year	326,414	422,277
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	396,845	1,176,608
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,009,450	547,825
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	186,890	87,680
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	25,654	5,740
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,289	7,960
Financing Receivable, before Allowance for Credit Loss, Total	1,982,632	2,271,398
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	25
Financing Receivable, Allowance for Credit Loss, Writeoff	0	25
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	30,090	23,307
Financing Receivable, Year One, Originated, Current Fiscal Year	278,754	422,277
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	390,845	1,176,608
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	807,347	547,825
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	142,137	87,680
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	25,654	5,740
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,260	7,954
Financing Receivable, before Allowance for Credit Loss, Total	1,682,086	2,271,392
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 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	19,419
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	96,442
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
Financing Receivable, before Allowance for Credit Loss, Total	115,862
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Substandard
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	28,241
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	105,660
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	44,754
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, before Allowance for Credit Loss, Total	184,654
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 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	30	6
Financing Receivable, before Allowance for Credit Loss, Total	30	6
Commercial Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	220,541	178,918
Financing Receivable, Year One, Originated, Current Fiscal Year	1,811,502	1,796,393
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,181,903	2,519,100
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,313,140	1,669,458
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	938,677	560,035
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	353,992	394,508
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	390,853	277,230
Financing Receivable, before Allowance for Credit Loss, Total	7,210,607	7,395,644
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	6,617	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	1	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	4,569	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	277
Financing Receivable, Allowance for Credit Loss, Writeoff	11,187	277
Commercial Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	220,541	178,416
Financing Receivable, Year One, Originated, Current Fiscal Year	1,613,494	1,686,143
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,116,496	2,424,042
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,987,215	1,628,250
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	866,130	559,052
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	346,738	364,737
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	370,548	247,184
Financing Receivable, before Allowance for Credit Loss, Total	6,521,163	7,087,824
Commercial Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	0	502
Financing Receivable, Year One, Originated, Current Fiscal Year	88,433	4,248
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,385	25,474
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	127,114	26,208
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	12,312	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,870	29,772
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	10,366	6,014
Financing Receivable, before Allowance for Credit Loss, Total	251,480	92,218
Commercial Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member] | Substandard
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	97,626	106,002
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	59,022	69,584
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	198,811	15,000
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	55,477	983
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	384	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,910	24,025
Financing Receivable, before Allowance for Credit Loss, Total	421,230	215,595
Commercial Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member] | 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	11,949	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	4,757	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	30	6
Financing Receivable, before Allowance for Credit Loss, Total	16,735	6
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,878	10,369
Financing Receivable, Revolving	814,906	720,563
Financing Receivable, Year One, Originated, Current Fiscal Year	1,432,794	1,582,862
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,378,053	2,620,341
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,275,714	2,204,564
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,710,096	1,428,395
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,206,880	660,909
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,022,053	1,809,685
Financing Receivable, before Allowance for Credit Loss, Total	10,840,496	11,027,319
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	6,649	4,937
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	438	818
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	3,212	4,630
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	5,790	823
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	755	279
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	205	105
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	659	1,187
Financing Receivable, Allowance for Credit Loss, Writeoff	17,709	12,779
Total consumer | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	9,071	8,824
Financing Receivable, Revolving	811,096	717,632
Financing Receivable, Year One, Originated, Current Fiscal Year	1,428,969	1,579,238
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,372,603	2,603,843
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,257,910	2,194,529
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,699,069	1,417,802
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,198,368	653,584
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,979,055	1,768,145
Financing Receivable, before Allowance for Credit Loss, Total	10,747,070	10,934,773
Total consumer | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	127	205
Financing Receivable, Revolving	1,207	1,043
Financing Receivable, Year One, Originated, Current Fiscal Year	381	628
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	704	1,936
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,083	208
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	185	49
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	110
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	484	441
Financing Receivable, before Allowance for Credit Loss, Total	4,045	4,416
Total consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	10
Financing Receivable, Revolving	2,418	1,656
Financing Receivable, Year One, Originated, Current Fiscal Year	594	500
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	327	166
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	77	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	207
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	24	26
Financing Receivable, before Allowance for Credit Loss, Total	3,440	2,556
Total consumer | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,679	1,330
Financing Receivable, Revolving	185	231
Financing Receivable, Year One, Originated, Current Fiscal Year	2,849	2,496
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,420	14,396
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	16,644	9,827
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,842	10,544
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,512	7,007
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	42,490	41,073
Financing Receivable, before Allowance for Credit Loss, Total	85,941	85,574
Total consumer | Residential Mortgage [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	175,539	354,236
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	509,647	1,627,070
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,590,679	2,119,836
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,653,482	1,424,583
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,204,049	654,675
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,914,144	1,684,490
Financing Receivable, before Allowance for Credit Loss, Total	7,047,541	7,864,891
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	134	32
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	125	42
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	101	148
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	153	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	515	723
Financing Receivable, Allowance for Credit Loss, Writeoff	1,029	952
Total consumer | Residential Mortgage [Member] | 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	172,607	352,321
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	507,186	1,617,409
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,579,182	2,110,577
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,643,341	1,414,186
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,195,752	647,778
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,878,251	1,650,542
Financing Receivable, before Allowance for Credit Loss, Total	6,976,319	7,792,813
Total consumer | Residential Mortgage [Member] | 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	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	95
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	162	57
Financing Receivable, before Allowance for Credit Loss, Total	162	152
Total consumer | Residential Mortgage [Member] | Substandard
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	594	490
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	327	93
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	77	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	174
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	24	26
Financing Receivable, before Allowance for Credit Loss, Total	1,022	784
Total consumer | Residential Mortgage [Member] | 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	2,338	1,425
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,134	9,567
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	11,420	9,259
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10,141	10,397
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,297	6,628
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	35,708	33,865
Financing Receivable, before Allowance for Credit Loss, Total	70,038	71,142
Total consumer | Automobile 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	1,242,431	1,220,471
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	861,790	959,094
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	656,212	75,844
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	49,643	163
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	67	458
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	77	132
Financing Receivable, before Allowance for Credit Loss, Total	2,810,220	2,256,162
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	418	795
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	2,982	4,524
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	5,582	626
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	560	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Writeoff	9,541	5,950
Total consumer | Automobile Loan [Member] | 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	1,241,609	1,218,820
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	858,924	952,839
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	650,880	75,209
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	48,999	163
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	67	456
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	77	132
Financing Receivable, before Allowance for Credit Loss, Total	2,800,555	2,247,618
Total consumer | Automobile Loan [Member] | 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	332	619
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	704	1,850
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,048	205
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	178	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
Financing Receivable, before Allowance for Credit Loss, Total	2,262	2,674
Total consumer | Automobile Loan [Member] | Substandard
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		73
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
Financing Receivable, before Allowance for Credit Loss, Total		73
Total consumer | Automobile Loan [Member] | 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	491	1,032
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,162	4,332
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,284	430
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	466	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	3
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, before Allowance for Credit Loss, Total	7,402	5,797
Total consumer | Home Equity Loan
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,568	10,195
Financing Receivable, Revolving	570,051	521,434
Financing Receivable, Year One, Originated, Current Fiscal Year	467	1,717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,788	30,445
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26,305	6,217
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,520	2,500
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,180	5,308
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	57,941	60,907
Financing Receivable, before Allowance for Credit Loss, Total	664,252	628,526
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	93	53
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	21
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	3
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	9	31
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	19	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	10	22
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	85	294
Financing Receivable, Allowance for Credit Loss, Writeoff	216	424
Total consumer | Home Equity Loan | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	8,764	8,703
Financing Receivable, Revolving	569,866	521,000
Financing Receivable, Year One, Originated, Current Fiscal Year	411	1,678
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,684	29,863
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	25,372	6,084
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,289	2,327
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,965	4,891
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	50,841	53,350
Financing Receivable, before Allowance for Credit Loss, Total	655,429	619,192
Total consumer | Home Equity Loan | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	127	179
Financing Receivable, Revolving	81	200
Financing Receivable, Year One, Originated, Current Fiscal Year	41	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	87
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	29
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	15
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	323	378
Financing Receivable, before Allowance for Credit Loss, Total	445	708
Total consumer | Home Equity Loan | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan		10
Financing Receivable, Revolving		75
Financing Receivable, Year One, Originated, Current Fiscal Year		10
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		33
Financing Receivable, Originated, More than Five Years before Current Fiscal Year		0
Financing Receivable, before Allowance for Credit Loss, Total		118
Total consumer | Home Equity Loan | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,677	1,302
Financing Receivable, Revolving	104	160
Financing Receivable, Year One, Originated, Current Fiscal Year	15	29
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	103	495
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	933	132
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	231	144
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	215	368
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,778	7,180
Financing Receivable, before Allowance for Credit Loss, Total	8,378	8,508
Total consumer | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	310	174
Financing Receivable, Revolving	244,855	199,129
Financing Receivable, Year One, Originated, Current Fiscal Year	14,356	6,438
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,829	3,733
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,518	2,668
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,451	1,149
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	584	468
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	49,891	64,156
Financing Receivable, before Allowance for Credit Loss, Total	318,483	277,740
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	6,555	4,884
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	20	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	96	72
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	75	124
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	75	131
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	42	72
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	59	170
Financing Receivable, Allowance for Credit Loss, Writeoff	6,922	5,453
Total consumer | Other Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	308	121
Financing Receivable, Revolving	241,230	196,632
Financing Receivable, Year One, Originated, Current Fiscal Year	14,343	6,419
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,808	3,732
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,475	2,658
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,440	1,127
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	584	460
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	49,886	64,121
Financing Receivable, before Allowance for Credit Loss, Total	314,767	275,149
Total consumer | Other Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	26
Financing Receivable, Revolving	1,125	843
Financing Receivable, Year One, Originated, Current Fiscal Year	8	9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	36	3
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7	20
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	6
Financing Receivable, before Allowance for Credit Loss, Total	1,176	881
Total consumer | Other Consumer [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0	0
Financing Receivable, Revolving	2,418	1,582
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	0	0
Financing Receivable, before Allowance for Credit Loss, Total	2,418	1,582
Total consumer | Other Consumer [Member] | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2	27
Financing Receivable, Revolving	81	71
Financing Receivable, Year One, Originated, Current Fiscal Year	5	10
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	21	1
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7	6
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4	2
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	8
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4	29
Financing Receivable, before Allowance for Credit Loss, Total	$ 122	$ 128

Loans, Loans by Past Due Status

Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 29,768,586	$ 29,216,218
Financing Receivable, Nonaccrual	123,260	148,997
Nonaccrual Loans, Current Portion	$ 52,000	$ 80,000
Percent of current nonaccrual loans	42%	53%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	24,000	23,000
Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	29,565,335	28,983,708
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	40,961	38,113
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	35,841	23,712
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,189	21,689
Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,573,741	9,731,555
Financing Receivable, Nonaccrual	19,084	62,022
Commercial and Industrial Sector [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,552,756	9,663,587
Commercial and Industrial Sector [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	899	5,374
Commercial and Industrial Sector [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	361	191
Commercial and Industrial Sector [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	642	380
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,143,741	1,061,700
Financing Receivable, Nonaccrual	1,501	1,394
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,140,607	1,059,948
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,533	0
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	101	358
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Commercial And Business Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,717,483	10,793,255
Financing Receivable, Nonaccrual	20,585	63,416
Commercial And Business Lending [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,693,363	10,723,536
Commercial And Business Lending [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,432	5,374
Commercial And Business Lending [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	462	549
Commercial And Business Lending [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	642	380
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,227,975	5,124,245
Financing Receivable, Nonaccrual	16,705	0
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,174,879	5,086,117
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,117	0
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,274	18,697
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	19,432
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,982,632	2,271,398
Financing Receivable, Nonaccrual	30	6
Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,982,581	2,271,392
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	21	0
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,210,607	7,395,644
Financing Receivable, Nonaccrual	16,735	6
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,157,460	7,357,509
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,138	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,274	18,697
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	19,432
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,928,090	18,188,898
Financing Receivable, Nonaccrual	37,320	63,422
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,850,823	18,081,044
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,570	5,374
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,736	19,246
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	642	19,812
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,047,541	7,864,891
Financing Receivable, Nonaccrual	70,038	71,142
Residential Mortgage [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,962,610	7,780,304
Residential Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	14,731	13,294
Residential Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	162	152
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,810,220	2,256,162
Financing Receivable, Nonaccrual	7,402	5,797
Automobile Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,787,967	2,232,906
Automobile Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	12,588	14,712
Automobile Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,262	2,674
Automobile Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	73
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	664,252	628,526
Financing Receivable, Nonaccrual	8,378	8,508
Home Equity Line of Credit [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	651,248	615,810
Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,181	3,500
Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	445	708
Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	318,483	277,740
Financing Receivable, Nonaccrual	122	128
Other Consumer [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	312,687	273,644
Other Consumer [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,892	1,233
Other Consumer [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,236	932
Other Consumer [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,547	1,803
Total consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,840,496	11,027,319
Financing Receivable, Nonaccrual	85,941	85,574
Total consumer | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,714,512	10,902,664
Total consumer | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	33,391	32,739
Total consumer | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,105	4,467
Total consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 2,547	$ 1,876

Loans, Modifications (Details)

Loans, Modifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term, Range, From	282 months	175 months
Financing Receivable, Modified, Weighted Average Term, Range, To	386 months	245 months
Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 3,019	$ 2,087
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(8.00%)	(11.00%)
Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 0	$ 233
Financing Receivable, Modified, Weighted Average Term Increase from Modification	105 months	71 months
Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 3,093	$ 1,204
Commercial and Industrial Sector [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 475	$ 306
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(18.00%)	(19.00%)
Residential Mortgage [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 295	$ 0
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	2%	1%
Residential Mortgage [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 0	$ 208
Financing Receivable, Modified, Weighted Average Term Increase from Modification	108 months	65 months
Residential Mortgage [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 2,849	$ 865
Automobile Loan [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 10	$ 255
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(7.00%)	(9.00%)
Home Equity Loan | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 0	$ 77
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(3.00%)	0%
Home Equity Loan | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 0	$ 25
Financing Receivable, Modified, Weighted Average Term Increase from Modification	63 months	85 months
Home Equity Loan | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 244	$ 339
Other Consumer [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified in Period, Amount	$ 2,239	$ 1,449
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	(21.00%)	(21.00%)

Loans, Modifications in Last 12

Loans, Modifications in Last 12 Months, Performance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	$ 5,318	$ 3,056
Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	456	215
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	338	253
Commercial and Industrial Sector [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	475	306
Commercial and Industrial Sector [Member] | 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	0
Commercial and Industrial Sector [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0	0
Residential Mortgage [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	2,355	773
Residential Mortgage [Member] | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	453	56
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	336	245
Automobile Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	5	218
Automobile Loan [Member] | Financial Asset, 30-89 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	3	36
Automobile Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	2	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	244	310
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	0	123
Home Equity Loan | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	0	9
Other Consumer [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	2,239	1,449
Other Consumer [Member] | 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	0
Other Consumer [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Modified in Last 12 Months, Performance [Line Items]
Financing Receivable, Modified in Period, Amount	$ 0	$ 0

Loans, Modified, Subsequent Def

Loans, Modified, Subsequent Default (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	$ 2	$ 0
Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0	208
Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	337	275
Residential Mortgage [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0	0
Residential Mortgage [Member] | Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0	208
Residential Mortgage [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	151	248
Home Equity Loan | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0	0
Home Equity Loan | Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0	0
Home Equity Loan | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	186	$ 27
Automobile Loan [Member] | Interest Rate Below Market Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	2
Automobile Loan [Member] | Extended Maturity [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	0
Automobile Loan [Member] | Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modified, Subsequent Default [Line Items]
Financing Receivable, Modified, Subsequent Default	$ 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]
Financing Receivable, Modifications, Number of Contracts | loan	72
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 11,370
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 11,616
Commercial and Industrial Sector [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	2
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 281
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 281
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	55
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 10,557
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 10,777
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	15
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 531
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 557

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Subsequent Default (Details) - Residential Portfolio Segment [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 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, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 76,415	$ 58,768
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	34,776	38,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	4,000	(4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	38,776	34,776	$ 38,776
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	76,415	58,768
Provision for Loan, Lease, and Other Losses	84,986	83,021	32,998
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	351,094	312,720
Financing Receivable, Allowance for Credit Loss, Writeoff	(76,415)	(58,768)
Financing Receivable, Allowance for Credit Loss, Recovery	7,867	10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(68,549)	(48,626)
Provision for loan losses	81,000	87,000
Financing Receivable, Allowance for Credit Loss, Ending Balance	363,545	351,094	312,720
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(76,415)	(58,768)
Financing Receivable, Allowance for Credit Loss, Recovery	7,867	10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(68,549)	(48,626)
Allowance for Loan Losses [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	128,263	119,076
Financing Receivable, Allowance for Credit Loss, Writeoff	(47,517)	(45,687)
Financing Receivable, Allowance for Credit Loss, Recovery	2,148	3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,369)	(42,672)
Provision for loan losses	53,703	51,859
Financing Receivable, Allowance for Credit Loss, Ending Balance	136,596	128,263	119,076
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(47,517)	(45,687)
Financing Receivable, Allowance for Credit Loss, Recovery	2,148	3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,369)	(42,672)
Allowance for Loan Losses [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	10,610	9,475
Financing Receivable, Allowance for Credit Loss, Writeoff	(3)	(25)
Financing Receivable, Allowance for Credit Loss, Recovery	7	11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	4	(15)
Provision for loan losses	(1,198)	1,150
Financing Receivable, Allowance for Credit Loss, Ending Balance	9,417	10,610	9,475
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(3)	(25)
Financing Receivable, Allowance for Credit Loss, Recovery	7	11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	4	(15)
Allowance for Loan Losses [Member] | Commercial And Business Lending [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	138,873	128,551
Financing Receivable, Allowance for Credit Loss, Writeoff	(47,520)	(45,713)
Financing Receivable, Allowance for Credit Loss, Recovery	2,155	3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,365)	(42,687)
Provision for loan losses	52,505	53,009
Financing Receivable, Allowance for Credit Loss, Ending Balance	146,013	138,873	128,551
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(47,520)	(45,713)
Financing Receivable, Allowance for Credit Loss, Recovery	2,155	3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,365)	(42,687)
Allowance for Loan Losses [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	67,858	54,398
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,187)	(252)
Financing Receivable, Allowance for Credit Loss, Recovery	0	3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,187)	2,763
Provision for loan losses	14,876	10,697
Financing Receivable, Allowance for Credit Loss, Ending Balance	71,547	67,858	54,398
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,187)	(252)
Financing Receivable, Allowance for Credit Loss, Recovery	0	3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,187)	2,763
Allowance for Loan Losses [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	53,554	45,589
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(25)
Financing Receivable, Allowance for Credit Loss, Recovery	65	80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	65	55
Provision for loan losses	(2,119)	7,910
Financing Receivable, Allowance for Credit Loss, Ending Balance	51,499	53,554	45,589
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(25)
Financing Receivable, Allowance for Credit Loss, Recovery	65	80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	65	55
Allowance for Loan Losses [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	121,412	99,986
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,187)	(277)
Financing Receivable, Allowance for Credit Loss, Recovery	65	3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,122)	2,819
Provision for loan losses	12,756	18,607
Financing Receivable, Allowance for Credit Loss, Ending Balance	123,046	121,412	99,986
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,187)	(277)
Financing Receivable, Allowance for Credit Loss, Recovery	65	3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,122)	2,819
Allowance for Loan Losses [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	260,285	228,538
Financing Receivable, Allowance for Credit Loss, Writeoff	(58,707)	(45,989)
Financing Receivable, Allowance for Credit Loss, Recovery	2,220	6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(56,487)	(39,868)
Provision for loan losses	65,262	71,616
Financing Receivable, Allowance for Credit Loss, Ending Balance	269,060	260,285	228,538
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(58,707)	(45,989)
Financing Receivable, Allowance for Credit Loss, Recovery	2,220	6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(56,487)	(39,868)
Allowance for Loan Losses [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	37,808	38,298
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,029)	(952)
Financing Receivable, Allowance for Credit Loss, Recovery	280	541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(750)	(411)
Provision for loan losses	(4,483)	(79)
Financing Receivable, Allowance for Credit Loss, Ending Balance	32,576	37,808	38,298
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,029)	(952)
Financing Receivable, Allowance for Credit Loss, Recovery	280	541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(750)	(411)
Allowance for Loan Losses [Member] | Automobile Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	24,961	19,619
Financing Receivable, Allowance for Credit Loss, Writeoff	(9,541)	(5,950)
Financing Receivable, Allowance for Credit Loss, Recovery	2,905	1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(6,637)	(4,709)
Provision for loan losses	10,142	10,051
Financing Receivable, Allowance for Credit Loss, Ending Balance	28,467	24,961	19,619
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(9,541)	(5,950)
Financing Receivable, Allowance for Credit Loss, Recovery	2,905	1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(6,637)	(4,709)
Allowance for Loan Losses [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	15,403	14,875
Financing Receivable, Allowance for Credit Loss, Writeoff	(216)	(424)
Financing Receivable, Allowance for Credit Loss, Recovery	1,366	1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	1,150	837
Provision for loan losses	67	(310)
Financing Receivable, Allowance for Credit Loss, Ending Balance	16,620	15,403	14,875
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(216)	(424)
Financing Receivable, Allowance for Credit Loss, Recovery	1,366	1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	1,150	837
Allowance for Loan Losses [Member] | Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	12,638	11,390
Financing Receivable, Allowance for Credit Loss, Writeoff	(6,922)	(5,453)
Financing Receivable, Allowance for Credit Loss, Recovery	1,096	978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,826)	(4,475)
Provision for loan losses	10,012	5,723
Financing Receivable, Allowance for Credit Loss, Ending Balance	16,824	12,638	11,390
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(6,922)	(5,453)
Financing Receivable, Allowance for Credit Loss, Recovery	1,096	978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,826)	(4,475)
Allowance for Loan Losses [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	90,809	84,182
Financing Receivable, Allowance for Credit Loss, Writeoff	(17,709)	(12,779)
Financing Receivable, Allowance for Credit Loss, Recovery	5,647	4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(12,062)	(8,758)
Provision for loan losses	15,738	15,384
Financing Receivable, Allowance for Credit Loss, Ending Balance	94,486	90,809	84,182
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(17,709)	(12,779)
Financing Receivable, Allowance for Credit Loss, Recovery	5,647	4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(12,062)	(8,758)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	34,776	38,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	4,000	(4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	38,776	34,776	38,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and Industrial Sector [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	13,319	12,997
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	1,137	321
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	14,456	13,319	12,997
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	149	103
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	2	46
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	151	149	103
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial And Business Lending [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	13,468	13,101
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	1,139	367
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	14,607	13,468	13,101
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	480	710
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	98	(230)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	578	480	710
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Construction Loans [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	17,024	20,583
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	2,567	(3,558)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	19,591	17,024	20,583
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	17,504	21,292
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	2,664	(3,788)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	20,169	17,504	21,292
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	30,972	34,393
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	3,803	(3,421)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	34,776	30,972	34,393
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home Equity Line of Credit [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	2,629	2,699
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(164)	(70)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	2,465	2,629	2,699
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other Consumer [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	1,174	1,683
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	361	(509)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	1,535	1,174	1,683
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Consumer Portfolio Segment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	3,803	4,382
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	197	(579)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	4,000	3,803	4,382
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	(76,415)	(58,768)
Financing Receivable, Allowance for Credit Loss, Recovery	7,867	10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(68,549)	(48,626)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	385,870	351,496
Financing Receivable, Allowance for Credit Loss, Writeoff	(76,415)	(58,768)
Financing Receivable, Allowance for Credit Loss, Recovery	7,867	10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(68,549)	(48,626)
Provision for Loan, Lease, and Other Losses	85,000	83,000
Balance at end of period	$ 402,322	$ 385,870	351,496
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.35%	1.32%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (47,517)	$ (45,687)
Financing Receivable, Allowance for Credit Loss, Recovery	2,148	3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,369)	(42,672)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	141,582	132,073
Financing Receivable, Allowance for Credit Loss, Writeoff	(47,517)	(45,687)
Financing Receivable, Allowance for Credit Loss, Recovery	2,148	3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,369)	(42,672)
Provision for Loan, Lease, and Other Losses	54,840	52,181
Balance at end of period	$ 151,052	$ 141,582	132,073
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.43%	1.45%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (3)	$ (25)
Financing Receivable, Allowance for Credit Loss, Recovery	7	11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	4	(15)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	10,759	9,579
Financing Receivable, Allowance for Credit Loss, Writeoff	(3)	(25)
Financing Receivable, Allowance for Credit Loss, Recovery	7	11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	4	(15)
Provision for Loan, Lease, and Other Losses	(1,196)	1,195
Balance at end of period	$ 9,568	$ 10,759	9,579
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	0.84%	1.01%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial And Business Lending [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (47,520)	$ (45,713)
Financing Receivable, Allowance for Credit Loss, Recovery	2,155	3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,365)	(42,687)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	152,341	141,652
Financing Receivable, Allowance for Credit Loss, Writeoff	(47,520)	(45,713)
Financing Receivable, Allowance for Credit Loss, Recovery	2,155	3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(45,365)	(42,687)
Provision for Loan, Lease, and Other Losses	53,644	53,376
Balance at end of period	$ 160,620	$ 152,341	141,652
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.37%	1.41%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (11,187)	$ (252)
Financing Receivable, Allowance for Credit Loss, Recovery	0	3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,187)	2,763
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	68,338	55,108
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,187)	(252)
Financing Receivable, Allowance for Credit Loss, Recovery	0	3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,187)	2,763
Provision for Loan, Lease, and Other Losses	14,973	10,467
Balance at end of period	$ 72,125	$ 68,338	55,108
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.38%	1.33%
Allowance for Loans Losses and Unfunded Commitments [Member] | Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 0	$ (25)
Financing Receivable, Allowance for Credit Loss, Recovery	65	80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	65	55
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	70,578	66,171
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(25)
Financing Receivable, Allowance for Credit Loss, Recovery	65	80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	65	55
Provision for Loan, Lease, and Other Losses	447	4,351
Balance at end of period	$ 71,090	$ 70,578	66,171
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	3.59%	3.11%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (11,187)	$ (277)
Financing Receivable, Allowance for Credit Loss, Recovery	65	3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,122)	2,819
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	138,916	121,279
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,187)	(277)
Financing Receivable, Allowance for Credit Loss, Recovery	65	3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(11,122)	2,819
Provision for Loan, Lease, and Other Losses	15,421	14,819
Balance at end of period	$ 143,215	$ 138,916	121,279
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.99%	1.88%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (58,707)	$ (45,989)
Financing Receivable, Allowance for Credit Loss, Recovery	2,220	6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(56,487)	(39,868)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	291,257	262,931
Financing Receivable, Allowance for Credit Loss, Writeoff	(58,707)	(45,989)
Financing Receivable, Allowance for Credit Loss, Recovery	2,220	6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(56,487)	(39,868)
Provision for Loan, Lease, and Other Losses	69,065	68,195
Balance at end of period	$ 303,835	$ 291,257	262,931
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.61%	1.60%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (1,029)	$ (952)
Financing Receivable, Allowance for Credit Loss, Recovery	280	541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(750)	(411)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	37,808	38,298
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,029)	(952)
Financing Receivable, Allowance for Credit Loss, Recovery	280	541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(750)	(411)
Provision for Loan, Lease, and Other Losses	(4,483)	(79)
Balance at end of period	$ 32,576	$ 37,808	38,298
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	0.46%	0.48%
Allowance for Loans Losses and Unfunded Commitments [Member] | Automobile Loan [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (9,541)	$ (5,950)
Financing Receivable, Allowance for Credit Loss, Recovery	2,905	1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(6,637)	(4,709)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	24,961	19,619
Financing Receivable, Allowance for Credit Loss, Writeoff	(9,541)	(5,950)
Financing Receivable, Allowance for Credit Loss, Recovery	2,905	1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(6,637)	(4,709)
Provision for Loan, Lease, and Other Losses	10,142	10,051
Balance at end of period	$ 28,467	$ 24,961	19,619
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	1.01%	1.11%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (216)	$ (424)
Financing Receivable, Allowance for Credit Loss, Recovery	1,366	1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	1,150	837
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	18,032	17,574
Financing Receivable, Allowance for Credit Loss, Writeoff	(216)	(424)
Financing Receivable, Allowance for Credit Loss, Recovery	1,366	1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	1,150	837
Provision for Loan, Lease, and Other Losses	(97)	(380)
Balance at end of period	$ 19,085	$ 18,032	17,574
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	2.87%	2.87%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (6,922)	$ (5,453)
Financing Receivable, Allowance for Credit Loss, Recovery	1,096	978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,826)	(4,475)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	13,812	13,073
Financing Receivable, Allowance for Credit Loss, Writeoff	(6,922)	(5,453)
Financing Receivable, Allowance for Credit Loss, Recovery	1,096	978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5,826)	(4,475)
Provision for Loan, Lease, and Other Losses	10,373	5,214
Balance at end of period	$ 18,359	$ 13,812	13,073
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	5.76%	4.97%
Allowance for Loans Losses and Unfunded Commitments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (17,709)	$ (12,779)
Financing Receivable, Allowance for Credit Loss, Recovery	5,647	4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(12,062)	(8,758)
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	94,613	88,565
Financing Receivable, Allowance for Credit Loss, Writeoff	(17,709)	(12,779)
Financing Receivable, Allowance for Credit Loss, Recovery	5,647	4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(12,062)	(8,758)
Provision for Loan, Lease, and Other Losses	15,935	14,805
Balance at end of period	$ 98,486	$ 94,613	$ 88,565
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent	0.91%	0.86%

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loans Information [Line Items]
Interest Receivable	$ 167,772	$ 169,569
Financing Receivable, Accrued Interest, Writeoff	2,000	2,000	$ 491
Mortgage Loans in Process of Foreclosure, Amount	23,000	16,000
Loans and Finance Receivables [Member]
Loans Information [Line Items]
Interest Receivable	$ 126,000	$ 132,000

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary of core deposit intangibles and other intangibles
Amortization of Intangible Assets	$ 8,811	$ 8,811	$ 8,811
Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Finite-Lived Intangible Assets, Gross		88,109	88,109	$ 88,109
Finite-Lived Intangible Assets, Accumulated Amortization	(56,449)	(47,638)	(38,827)
Finite-Lived Intangible Assets, Net, Total	31,660	40,471	49,282
Amortization of Intangible Assets	$ 8,811	$ 8,811	$ 8,811

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, 2024	Dec. 31, 2023	Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount, Beginning Balance		$ 84,390	$ 77,351
Servicing Asset at Fair Value, Additions		6,707	3,564	$ 7,279
Servicing Asset at Fair Value, Disposals		(8,060)	(7,185)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions		0	8,881
Servicing Asset at Fair Value, Other Changes in Fair Value		4,646	1,778
Servicing Asset at Fair Value, Amount, Ending Balance	$ 84,390	87,683	84,390	77,351
Portfolio Of Residential Mortgage Loans Serviced For Others	$ 7,364,492	$ 6,285,018	$ 7,364,492
Mortgage Servicing Rights Net To Servicing Portfolio	1.15%	1.40%	1.15%
Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale		$ 663,038	$ 1,058,305	$ 18
Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Loan and Lease, Transfer from Held-in-Portfolio to Held-for-Sale	$ 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, 2024	Dec. 31, 2023	Dec. 31, 2022
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	3,485
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1,681
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	61
Finite-Lived Intangible Assets, Net, Total	31,660	$ 40,471	$ 49,282
Servicing Contracts [Member]
Estimated future amortization expense
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	9,767
Finite-Lived Intangible Assets, Amortization Expense, Year Two	11,230
Finite-Lived Intangible Assets, Amortization Expense, Year Three	11,602
Finite-Lived Intangible Assets, Amortization Expense, Year Four	10,945
Finite-Lived Intangible Assets, Amortization Expense, Year Five	9,767
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	34,373
Finite-Lived Intangible Assets, Net, Total	$ 87,683

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Details) (Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill, Impaired, Facts and Circumstances Leading to Impairment	no
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Goodwill	$ 1,104,992	$ 1,104,992

Premises and Equipment, Summary

Premises and Equipment, Summary Composition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 781,932
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	402,840
Property, Plant and Equipment, Net, Total	379,093	$ 372,978
Depreciation	48,845	46,989	$ 45,088
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	63,642
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	0
Property, Plant and Equipment, Net, Total	63,642	63,984
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	22,911
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	11,533
Property, Plant and Equipment, Net, Total	11,379	11,250
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	415,690
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	198,699
Property, Plant and Equipment, Net, Total	216,991	212,004
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	60,198
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	50,055
Property, Plant and Equipment, Net, Total	10,143	10,845
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	116,482
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	91,823
Property, Plant and Equipment, Net, Total	24,658	35,627
Operating Leases [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	56,818
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	23,616
Property, Plant and Equipment, Net, Total	33,202	24,712
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	46,192
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	27,113
Property, Plant and Equipment, Net, Total	$ 19,078	$ 14,556

Property, Plant, and Equipment

Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Depreciation	$ 48,845	$ 46,989	$ 45,088
Land Improvement, Building, Leasehold Improvements, ATM, Computers, Furniture, Fixtures, and Auto [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 29,000	$ 30,000	$ 31,000

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating Lease, Cost	$ 6,414	$ 6,281	$ 6,812
Finance Lease, Cost	373	92	119
Operating Lease, Payments	6,617	7,171	8,440
Finance Lease, Payments	$ 93	$ 92	$ 125

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 35,596
Finance Lease, Liability	295	$ 383
Assets
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	33,202	24,712
Other Assets [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Right-of-Use Asset	0	368
Accrued Liabilities
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	35,596	27,311
Long-Term Debt [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Liability	$ 295	$ 383

Leases Operating Lease Informat

Leases Operating Lease Information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 42,505	$ 30,187
Operating Lease, Weighted Average Remaining Lease Term	8 years 1 month 17 days	5 years 10 months 17 days
Operating Lease, Weighted Average Discount Rate, Percent	4.20%	3.19%
Finance Lease, Liability, Payment, Due	$ 301	$ 394
Finance Lease, Weighted Average Remaining Lease Term	3 years 3 months	4 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	$ 39,072	$ 25,729
Operating Lease, Weighted Average Remaining Lease Term	8 years 3 months 18 days	5 years 9 months 3 days
Operating Lease, Weighted Average Discount Rate, Percent	4.26%	3.12%
Finance Lease, Liability, Payment, Due	$ 301	$ 394
Finance Lease, Weighted Average Remaining Lease Term	3 years 3 months	4 years 3 months
Finance Lease, Weighted Average Discount Rate, Percent	1.32%	1.32%
Land [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 3,228	$ 4,050
Operating Lease, Weighted Average Remaining Lease Term	6 years 7 months 17 days	6 years 11 months 23 days
Operating Lease, Weighted Average Discount Rate, Percent	3.52%	3.48%
Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 204	$ 408
Operating Lease, Weighted Average Remaining Lease Term	1 year 6 months	2 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	4.62%	4.62%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 6,760
Lessee, Operating Lease, Liability, to be Paid, Year Two	6,228
Lessee, Operating Lease, Liability, to be Paid, Year Three	5,572
Lessee, Operating Lease, Liability, to be Paid, Year Four	4,845
Lessee, Operating Lease, Liability, to be Paid, Year Five	3,612
Lessee, Operating Lease, Liability, to be Paid, after Year Five	15,487
Lessee, Operating Lease, Liability, to be Paid, Total	42,505	$ 30,187
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	6,909
Operating Lease, Liability	35,596
Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Finance Lease, Liability, Payments, Due Next Twelve Months	93
Finance Lease, Liability, to be Paid, Year Two	93
Finance Lease, Liability, to be Paid, Year Three	93
Finance Lease, Liability, to be Paid, Year Four	23
Finance Lease, Liability, to be Paid, Year Five	0
Finance Lease, Liability, to be Paid, after Year Five	0
Finance Lease, Liability, to be Paid, Total	301	394
Finance Lease, Liability, Undiscounted Excess Amount	6
Finance Lease, Liability	295	$ 383
Total Leases [Line Items]
Lease, Liability, Payments, Due in Next Twelve Months	6,853
Lease, Liability, Payments, Due Year Two	6,321
Lease, Liability, Payments, Due Year Three	5,664
Lease, Liability, Payments, Due Year Four	4,868
Lease, Liability, Payments, Due Year Five	3,612
Lease, Liability, Payments, Due after Year Five	15,487
Lease, Liability, Payments, Due, Total	42,806
Lease, Liability, Undiscounted Excess Amount	6,915
Lease, Liability	$ 35,891

Leases, Minimum Annual Rent Und

Leases, Minimum Annual Rent Under Operating Lease Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 6,760
Lessee, Operating Lease, Liability, to be Paid, Year Two	6,228
Lessee, Operating Lease, Liability, to be Paid, Year Three	5,572
Lessee, Operating Lease, Liability, to be Paid, Year Four	4,845
Lessee, Operating Lease, Liability, to be Paid, Year Five	3,612
Lessee, Operating Lease, Liability, to be Paid, after Year Five	15,487
Lessee, Operating Lease, Liability, Payments, Due	42,505	$ 30,187
Lessor, Operating Lease, Payment to be Received, Year One	3,628
Lessor, Operating Lease, Payment to be Received, Year Two	3,475
Lessor, Operating Lease, Payment to be Received, Year Three	3,170
Lessor, Operating Lease, Payment to be Received, Year Four	2,510
Lessor, Operating Lease, Payment to be Received, Year Five	2,454
Lessor, Operating Lease, Payment to be Received, after Year Five	11,493
Lessor, Operating Lease, Payments to be Received	26,730
Rental Payments
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, to be Paid, Year One	6,565
Lessee, Operating Lease, Liability, to be Paid, Year Two	6,293
Lessee, Operating Lease, Liability, to be Paid, Year Three	5,636
Lessee, Operating Lease, Liability, to be Paid, Year Four	4,855
Lessee, Operating Lease, Liability, to be Paid, Year Five	3,604
Lessee, Operating Lease, Liability, to be Paid, after Year Five	15,650
Lessee, Operating Lease, Liability, Payments, Due	$ 42,603

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Liability	$ 2	$ 3
Operating Leases, Rent Expense, Net	$ 3	$ 2	$ 3
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 [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	38 years
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	7 years

Deposits, Composition (Details)

Deposits, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deposits, by Type [Abstract]
Noninterest-Bearing Domestic Deposit, Demand	$ 5,775,657	$ 6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Deposits, Negotiable Order of Withdrawal (NOW)	9,124,741	8,843,967
Deposits, Money Market Deposits	6,637,915	6,330,453
Brokered Certificates Of Deposit	4,276,309	4,447,479
Interest-Bearing Domestic Deposit, Other Time Deposit	3,700,518	2,868,494
Deposits, Total	$ 34,648,434	$ 33,446,049

Deposits, Time Deposit Maturiti

Deposits, Time Deposit Maturities (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
Time Deposit Maturities, Year One	$ 7,898,330
Time Deposit Maturities, Year Two	47,925
Time Deposit Maturities, Year Three	17,814
Time Deposit Maturities, Year Four	6,204
Time Deposit Maturities, Year Five	6,550
Time Deposit Maturities, after Year Five	5
Time Deposits, Total	$ 7,976,827

Deposits (Details)

Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deposits [Abstract]
Time Deposits, $250,000 Or More	$ 758	$ 523

Short and Long-term Funding, Co

Short and Long-term Funding, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Short-Term Debt [Abstract]
Federal Funds Purchased	$ 370,325	$ 220,160
Securities Sold under Agreements to Repurchase	100,044	106,620
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	470,369	326,780
Debt Instrument [Line Items]
Senior Notes	300,000	0
Subordinated Debt	550,000	550,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(8,664)	(7,748)
Finance Lease, Liability	295	383
Other Long-term Debt	837,635	541,269
TotalShortTermLongTermExcludingFHLB	1,308,004	868,049
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	1,250,000	740,000
Long-Term Federal Home Loan Bank Advances	611,551	1,209,907
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Debt, Long-Term and Short-Term, Combined Amount, Total	3,161,811	2,808,243
Fair Value Hedging
Debt Instrument [Line Items]
Subordinated Debt	(3,996)	(1,366)
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	$ (7,744)	$ (9,713)

Short and Long-term Funding Rem

Short and Long-term Funding Remaining Contractual Maturity of Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
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	$ 100,044	$ 106,620

Short and Long-term Funding Lon

Short and Long-term Funding Long-term Funding, Maturities (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Long-Term Debt, Maturity, Year One	$ 648,841
Long-Term Debt, Maturity, Year Two	4,504
Long-Term Debt, Maturity, Year Three	510
Long-Term Debt, Maturity, Year Four	196,487
Long-Term Debt, Maturity, Year Five	3,235
Long-Term Debt, Maturity, after Year Five	587,865
Long-Term Debt	$ 1,441,442

Short and Long-term Funding Sho

Short and Long-term Funding Short and Long-term Funding (Details Textuals) - USD ($) $ in Thousands					12 Months Ended
	Aug. 29, 2029	Aug. 29, 2024	Feb. 06, 2023	Nov. 13, 2014	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Fair Value of Pledged Securities to Securities Sold under Agreements to Repurchase					176%
Senior Notes					$ 300,000	$ 0
Debt Instrument, Rate Conversion Date		Aug. 29, 2029
Debt Instrument, Redemption Period, Start Date			Mar. 01, 2028
Interest Added to 5 Year UST Rate			2.812%
Debt, Weighted Average Interest Rate					3.77%	4.93%
FHLB Advances, Prepayment Amount					$ 600,000
FHLB Advances, Prepayment Penalty					14,243
Maximum [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged					$ 10,900,000
Two Thousand Twenty Four Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Issuance Date Month, Year		August 2024
Senior Notes		$ 300,000
Debt Instrument, Interest Rate, Stated Percentage		6.455%
Debt Instrument, Maturity Date		Aug. 29, 2030
Interest Added to Compound SOFR, effective floating rate		3.03%
Debt Instrument, Redemption Period, Start Date	Aug. 29, 2029
Debt Instrument, Redemption		Jul. 30, 2030
Two Thousand Fourteen Subordinated Notes [Member]
Debt Instrument [Line Items]
Junior Subordinated Debentures Issued				$ 250,000
Debt Instrument, Term				10 years
Debt Instrument Call Date Earliest Month Year				October 2024
Subordinated Borrowing, Interest Rate				4.25%
Debt Instrument, Maturity Date Month, Year				January 2025
Two Thousand Twenty Three Subordinated Notes
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			Mar. 01, 2033
Junior Subordinated Debentures Issued			$ 300,000
Debt Instrument, Term			10 years
Subordinated Borrowing, Interest Rate			6.625%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Nov. 18, 2024	Jun. 01, 2020	Sep. 19, 2018	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Preferred Stock, Shares Issued				200,000	200,000
Common Stock, Shares, Issued	13,800,000			189,016,409	175,216,409
Shares Issued, Price Per Share	$ 25
Stock Issued During Period, Value, New Issues	$ 331,000			$ 331,023
Subsidiary equity balance				4,500,000
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued			4,000,000
Preferred Stock, Dividend Rate, Percentage			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, Common [Member]
Class of Stock [Line Items]
Share Repurchase Program, Authorized, Amount				0
Purchase of stock, value				$ 18,000
Treasury stock acquired average cost per share (in usd per share)				$ 20.32
Stock Repurchased During Period, Shares				900,000
Common Stock [Member]
Class of Stock [Line Items]
Payments Related to Tax Withholding for Share-based Compensation				$ 6,000	$ 7,000
Shares Paid for Tax Withholding for Share Based Compensation				302,077	297,564
Minimum tax withholding settlement average cost per share (in usd per share)				$ 20.64	$ 22.16
Share Repurchase Program, Remaining Authorized, Amount				$ 61,000
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues				$ 138

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, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	3,792
Exercised (in shares)	1,923
Forfeited or expired (in shares)	91
Stock Options Shares Outstanding, Ending balance (in shares)	1,778	3,792
Options exercisable (in shares)	1,778
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)	$ 21.25
Exercised, Weighted Average Exercise Price (in usd per share)	20.06
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	24.85
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	22.36	$ 21.25
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 22.36
Stock Options Outstanding, Weighted Average Remaining Contractual Term	3 years 4 months 28 days	4 years 3 months 3 days
Options exercisable, Weighted Average Remaining Contractual Term	3 years 4 months 28 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 3,693	$ 5,834
Options exercisable, Aggregate Intrinsic Value	$ 3,693

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2024 $ / 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	2,349
Granted (in shares) | shares	837
Vested (in shares) | shares	790
Forfeited (in shares) | shares	87
Outstanding Shares, Ending balance (in shares) | shares	2,310
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance (in usd per share) | $ / shares	$ 21.20
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	20.76
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	23.64
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	21.96
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 21.25

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award	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 one or more performance measures as selected by the Compensation & Benefits Committee in its discretion, and service-based awards are contingent upon continued employment or meeting the requirements for retirement.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 10,000	$ 518	$ 4,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value	$ 489	$ 943	2,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years	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
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	$ 19,000	$ 17,000	$ 16,000
Share-Based Payment Arrangement, Accelerated Cost	5,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 18,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter of 2028
2020 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	5.2

Retirement Plans, Pension and P

Retirement Plans, Pension and Postretirement Plans Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in Benefit Obligation
Fair Value Of Plan Assets As A Percentage Of Net Benefit Obligation	224%	215%
RAP
Defined Benefit Plan Disclosure [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.
Change in Fair Value of Plan Assets
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance	$ 453,457	$ 407,405
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	43,676	60,565
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(18,163)	(14,513)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	478,970	453,457	$ 407,405
Change in Benefit Obligation
Defined Benefit Plan, Benefit Obligation, Beginning Balance	211,353	208,315
Defined Benefit Plan, Service Cost	3,027	3,189	3,670
Defined Benefit Plan, Interest Cost	11,173	10,887	7,152
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	5,975	3,475
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(18,163)	(14,513)
Defined Benefit Plan, Benefit Obligation, Ending Balance	213,365	211,353	208,315
Defined Benefit Plan, Funded (Unfunded) Status of Plan	265,605	242,104
Assets for Plan Benefits, Defined Benefit Plan	265,605	242,104
Liability, Defined Benefit Plan, Current	0	0
Liability, Defined Benefit Plan, Noncurrent	0	0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	$ 265,605	242,104
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [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.
Change in Fair Value of Plan Assets
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance	$ 0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	0	0
Defined Benefit Plan, Plan Assets, Contributions by Employer	183	171
Defined Benefit Plan, Plan Assets, Benefits Paid	(183)	(171)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	0	0	0
Change in Benefit Obligation
Defined Benefit Plan, Benefit Obligation, Beginning Balance	1,425	1,530
Defined Benefit Plan, Service Cost	0	0
Defined Benefit Plan, Interest Cost	73	78	53
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	729	(12)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(183)	(171)
Defined Benefit Plan, Benefit Obligation, Ending Balance	2,043	1,425	$ 1,530
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(2,043)	(1,425)
Assets for Plan Benefits, Defined Benefit Plan	0	0
Liability, Defined Benefit Plan, Current	(212)	(158)
Liability, Defined Benefit Plan, Noncurrent	(1,832)	(1,267)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position, Total	$ (2,043)	$ (1,425)

Retirement Plans, Amounts Recog

Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income Table (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
RAP
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	$ (723)	$ (884)
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	24,758	27,089
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total	24,035	26,204
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	(252)	(308)
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	267	(301)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax, Total	$ 15	$ (609)

Retirement Plans, Other Changes

Retirement Plans, Other Changes in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	$ (290)	$ (326)	$ (325)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	2,210	24,091	(51,745)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(511)	(6,304)	13,495
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	1,381	17,432	$ (37,917)
RAP
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	3,102	24,228
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(215)	(250)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(718)	(6,327)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2,169	17,650
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(729)	12
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(75)	(75)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(28)	(29)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	208	23
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	$ (624)	$ (68)

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, 2024	Dec. 31, 2023	Dec. 31, 2022
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Service Cost	$ 3,027	$ 3,189	$ 3,670
Defined Benefit Plan, Interest Cost	11,173	10,887	7,152
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(34,599)	(32,862)	(26,903)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(215)	(250)	(250)
Defined Benefit Plan, Amortization of Gain (Loss)	0	0	658
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ (20,614)	$ (19,037)	$ (15,673)

Retirement Plans Retirement Pla

Retirement Plans Retirement Plans, Components of Net Pension Cost for the Post Retirement Plan Table (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost	$ 73	$ 78	$ 53
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(75)	(75)	(75)
Defined Benefit Plan, Amortization of Gain (Loss)	(28)	(29)	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (31)	$ (26)	$ (22)

Retirement Plans, Weighted Aver

Retirement Plans, Weighted Average Assumptions used to Determine Benefit and Net Periodic Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
RAP
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.40%	5.40%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.50%	2.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	3.81%	3.77%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.40%	5.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.50%	2.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets	7.40%	7.30%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.40%	5.40%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.40%	5.40%

Retirement Plans, Asset Allocat

Retirement Plans, Asset Allocation for Pension Plan Table (Details) - RAP	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100%	100%
Defined Benefit Plan, Equity Securities, US [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	55%	54%
Defined Benefit Plan, Debt Security [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	35%	34%
Defined Benefit Plan, Group Annuity Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	8%	10%
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	2%	2%

Retirement Plans, Fair Value of

Retirement Plans, Fair Value of Pension Plan Investments Table (Details) - RAP - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plan Investments
RAP Investment Amount	$ 478,970	$ 453,457	$ 407,405
Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
RAP Investment Amount	438,554	409,771
Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Fair Value, Inputs, Level 3 [Member]
Pension Plan Investments
RAP Investment Amount	40,416	43,687
Money Market Funds [Member]
Pension Plan Investments
RAP Investment Amount	7,892	10,040
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
RAP Investment Amount	7,892	10,040
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Defined Benefit Plan, Common Collective Trust
Pension Plan Investments
RAP Investment Amount	183,059	164,891
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
RAP Investment Amount	183,059	164,891
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Defined Benefit Plan, Common Collective Trust | Fair Value, Inputs, Level 3 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Mutual Fund [Member]
Pension Plan Investments
RAP Investment Amount	247,602	234,840
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
RAP Investment Amount	247,602	234,840
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Group Annuity Contracts [Member]
Pension Plan Investments
RAP Investment Amount	40,416	43,687
Group Annuity Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Group Annuity Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
RAP Investment Amount	0	0
Group Annuity Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Pension Plan Investments
RAP Investment Amount	$ 40,416	$ 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 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance	$ 453,457	$ 407,405
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	478,970	453,457
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance	43,687
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	40,416	43,687
Group Annuity Contracts [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance	43,687
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	40,416	43,687
Group Annuity Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance	43,687	40,939
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held	(731)	5,313
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlement	(2,539)	(2,565)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance	$ 40,416	$ 43,687

Retirement Plans, Estimated Fut

Retirement Plans, Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2024 USD ($)
RAP
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Year One	$ 22,579
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	21,689
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	20,165
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	20,135
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	20,179
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years	84,031
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Year One	217
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	213
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	208
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	203
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	196
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years	$ 856

Retirement Plans (Details Textu

Retirement Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2031	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
RAP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [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.
Defined Benefit Plan Actual Return on Plan Assets Percentage		10.16%	15.80%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [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.
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 183	171
Defined Benefit Plan, Health Care Cost Trend, Actual Rate Change		35.72%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year		6%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		5%
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2031
401(k) plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Cost		$ 17,000	$ 16,000	$ 15,000
Minimum [Member] | RAP | Defined Benefit Plan, Equity Securities, US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		50%
Minimum [Member] | RAP | Defined Benefit Plan, Debt Security [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		30%
Minimum [Member] | RAP | Other Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Minimum [Member] | RAP | Defined Benefit Plan, Alternative Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0%
Maximum [Member] | RAP | Defined Benefit Plan, Equity Securities, US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		70%
Maximum [Member] | RAP | Defined Benefit Plan, Debt Security [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		50%
Maximum [Member] | RAP | Other Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		10%
Maximum [Member] | RAP | Defined Benefit Plan, Alternative Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [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, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 38,353	$ 29,319	$ 58,982
Current State and Local Tax Expense (Benefit)	9,436	5,283	22,092
Current Income Tax Expense (Benefit), Total	47,789	34,602	81,074
Deferred Federal Income Tax Expense (Benefit)	(30,701)	(8,371)	12,531
Deferred State and Local Income Tax Expense (Benefit)	(5,775)	(3,135)	(97)
Deferred Income Tax Expense (Benefit), Total	(36,475)	(11,506)	12,434
Income Tax Expense (Benefit), Total	$ 11,314	$ 23,097	$ 93,508

Income Taxes, Deferred Tax Asse

Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Gross [Abstract]
Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss	$ 89,295	$ 83,378
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	9,840	8,933
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	26,109	14,089
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	30,404	28,429
Tax Credit Carryforward, Amount	18,160	8,849
Deferred Tax Assets, Other Loss Carryforwards	4,187	9,068
Deferred Tax Assets, Capital Loss Carryforwards	29,325	0
Deferred Tax Asset, Interest Carryforward	1,269	901
Deferred Tax Assets, Partnerships	37,781	2,365
Deferred Tax Assets, Leasing Arrangements	8,881	6,785
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	(16,228)	(48,632)
Deferred Tax Asset, Net Unrealized Losses on Benefit Plans	7,995	8,506
Deferred Tax Assets, Other	3,353	9,403
Deferred Tax Assets, Gross, Total	282,828	229,338
Deferred Tax Assets, Valuation Allowance	32,702	0	$ 0
Deferred Tax Assets, Net of Valuation Allowance	250,126	229,338
Deferred Tax Liabilities, Gross [Abstract]
Deferred Tax Liabilities, Prepaid Expenses	83,251	66,381
Deferred Tax Liabilities, Goodwill and Intangible Assets	22,376	22,161
Deferred Tax Liabilities, Mortgage Servicing Rights	21,877	20,799
Loans and Leases Receivable, Deferred Income	7,836	8,097
State income taxes	0	1,387
Deferred Tax Liabilities, Leasing Arrangements	13,213	15,297
Deferred Tax Liabilities, Property, Plant and Equipment	30,534	20,389
Purchase accounting	6,246	7,898
Deferred Tax Liability, Basis Difference From Equity Securities and Other Investments	3,104	7,593
Deferred Tax Liabilities, Other	0	1,207
Deferred Tax Liabilities, Gross, Total	188,437	171,209
Deferred Tax Assets, Net	$ 61,689	$ 58,129

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 32,702	$ 0	$ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (32,702)	$ 0

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, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%	21%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	10.60%	7.40%	3.40%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	2.20%	0.30%	4.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent	2.10%	1.10%	0.50%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	7.90%	4.70%	1.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent	(0.20%)	0%	(0.20%)
Effective income tax rate reconciliation, Portfolio optimization	(25.70%)	0%	0%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	24.30%	0%	0%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	4.80%	3%	0.70%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	2.30%	0%	0%
Effective Income Tax Rate Reconciliation, Changes in unrecognized tax benefits	0.40%	0%	0%
Effective Income Tax Rate Reconciliation, prior year return to provision	(0.50%)	0%	0%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.40%	0.10%	0.10%
Effective Income Tax Rate Reconciliation, Percent, Total	8.40%	11.20%	20.30%

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, 2024	Dec. 31, 2023
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	$ 2,227	$ 2,233
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(83)	441
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	462	435
Unrecognized Tax Benefits, Ending Balance	$ 2,772	$ 2,227

Income Taxes, Textuals (Details

Income Taxes, Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
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	117
Operating tax loss carryforwards from acquisitions	$ 2
Operating Loss Carryforwards, Expiration Date	2025

Derivative and Hedging Activi_2

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	$ 100,000
Derivative Liability, Notional Amount	300,000
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	254
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	333
Derivative Liability, Notional Amount	1,000
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	79,807	$ 87,075
Derivative Liability, Subject to Master Netting Arrangement, before Offset	14,369	18,767
Derivative Asset, Fair Value, Gross Liability	12,667	18,234
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	12,667	18,234
Derivative Asset, Collateral, Obligation to Return Cash, Offset	35,190	35,855
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	250	0
Derivative Asset	31,950	32,985
Derivative Liability	1,452	533
Interest Rate Lock Commitments [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	327	439
Interest Rate Lock Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	327	439
Interest Rate Lock Commitments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	0
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	98,854	123,723
Derivative Asset, Fair Value, Gross Liability	12,667	18,234
Derivative Asset, Collateral, Obligation to Return Cash, Offset	35,190	35,855
Derivative Asset	50,997	69,634
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	178,573	202,958
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	12,667	18,234
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	250	0
Derivative Liability	165,656	184,724
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	2,960	8,075
Derivative Liability	2,976	930
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	2,960	8,075
Derivative Liability	2,976	930
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	2,457	632
Derivative Liability	563	2,946
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	5,418	8,707
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	1,950,000	2,300,000
Designated as Hedging Instrument [Member] | Other Assets [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	127,518	231,566
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	3,539	3,876
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	1,150,000	550,000
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	216,665	189,212
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	88,541	111,623
Derivative Liability	170,928	195,662
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	0
Derivative Liability	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	88,541	111,623
Derivative Liability	170,928	195,662
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	4,315	2,954
Derivative Liability	4,106	2,746
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	580	439
Not Designated as Hedging Instrument [Member] | Forward commitments to sell residential mortgage loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	0	673
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	93,436	115,016
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	3,858,867	3,603,513
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	68,028	87,526
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	28,580	29,490
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	175,034	199,082
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	6,992,894	6,528,471
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	74,199	135,654
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Forward commitments to sell residential mortgage loans [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	$ 85,000	$ 51,500

Derivative and Hedging Activi_3

Derivative and Hedging Activities Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount excluded for foreign currency loans	$ 344,000	$ 421,000
Derivative Financial Instruments, Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability	(888,260)	(1,138,921)
Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	11,740	11,079
Long-Term Debt [Member] | Derivative Financial Instruments, Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability	(296,004)	(548,634)
Long-Term Debt [Member] | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	3,996	1,366
Federal Home Loan Bank Advances | Derivative Financial Instruments, Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability	(592,256)	(590,287)
Federal Home Loan Bank Advances | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 7,744	$ 9,713

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, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ (16,695)	$ (14,176)	$ (263)
Interest Income [Member] | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	(217)	(245)	(529)
Interest Income [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	(16,478)	(13,930)	266
Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	19,189	17,536	334
Other Operating Income (Expense) [Member] | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	(661)	5,084	(16,163)
Other Operating Income (Expense) [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	19,850	12,451	16,497
Capital market fees, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(3)	0	(9)
Capital market fees, net | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Foreign Currency Fair Value Hedge	(31,226)	9,322	(26,686)
Capital market fees, net | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Foreign Currency Fair Value Hedging Instruments	$ 31,223	(9,322)	$ 26,677
Loss on Mortgage Sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		(125)
Loss on Mortgage Sale | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge		(125)
Loss on Mortgage Sale | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments		$ 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, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	$ (21,537)	$ (13,254)	$ 3,626
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 16,478	$ 13,930	$ (266)

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, 2024	Dec. 31, 2023	Dec. 31, 2022
Capital market fees, net | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (133)	$ 392	$ 515
Capital market fees, net | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(371)	1,670	203
Capital market fees, net | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	0	(16)
Mortgage banking, net | Interest Rate Related Instruments - MSRs Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(6,531)	(1,096)	(12,622)
Mortgage banking, net | Interest Rate Lock Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(113)	353	(2,531)
Mortgage banking, net | Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 927	$ (627)	$ (123)

Derivative and Hedging Activi_6

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Underlying Hedged Asset, Amortized Cost Basis	$ 219,000
Additional Collateral, Aggregate Fair Value	81,000	$ 93,000
Derivative collateral right to reclaim cash	0	$ 5,000
Derivative Liability Notional Amount, Terminated			$ 500,000
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months	$ 1,000
Maximum Length of Time Hedged in Cash Flow Hedge	36 months
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 839

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract [Member] - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Offsetting Assets [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	$ 79,807	$ 87,075
Derivative Asset, Fair Value, Gross Liability	12,667	18,234
Derivative Asset, Collateral, Obligation to Return Cash, Offset	35,190	35,855
Derivative Asset	31,950	32,985
Derivative Collateral Obligation to Return Collateral	(31,950)	(32,985)
Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction	0	0
Offsetting Liabilities [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	14,369	18,767
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	12,667	18,234
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	250	0
Derivative Liability	1,452	533
Derivative Collateral Right to Reclaim Collateral	0	0
Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction	$ 1,452	$ 533

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, 2024	Dec. 31, 2023
Schedule of lending-related and other commitments [Line Items]
LendingRelatedCommitments, FairValue	$ 0	$ 0
Commitments to Extend Credit [Member]
Schedule of lending-related and other commitments [Line Items]
Other Commitment	11,173,438	11,170,147
Letter of Credit [Member]
Schedule of lending-related and other commitments [Line Items]
Other Commitment	875	3,697
Standby Letters of Credit [Member]
Schedule of lending-related and other commitments [Line Items]
Other Commitment	253,709	212,029
Standby letters of credit, fair value	$ 3,000	$ 2,000

Commitments, Changes in the All

Commitments, Changes in the Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance	$ 34,776	$ 38,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	4,000	(4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	$ 38,776	$ 34,776

Commitments, Off-Balance Shee_4

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of lending-related and other commitments [Line Items]
Investment, Proportional Amortization Method, Elected, Amount	$ 203,000	$ 215,000
Investment Program, Proportional Amortization Method, Elected, Impairment Loss	0	0	$ 0
Loans repurchased under make whole requests	3,000	5,000
Loans Sold To Outside Investors Loss Reimbursement Settlement Paid	$ 0	0
Make Whole Requests, Loan Origination Date, Majority	Jan. 01, 2021
Loans Sold To Outside Investors Original Amount	$ 4,400,000
Loans sold to outside investors remaining outstanding amount	2,600,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	38,776	34,776
Financing Receivable, before Allowance for Credit Loss	29,768,586	29,216,218
Residential Mortgage [Member]
Schedule of lending-related and other commitments [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	553	835
Residential Mortgage [Member] | Recourse [Member]
Schedule of lending-related and other commitments [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,000	15,000
Residential Mortgage [Member] | Recourse [Member] | Credit Risk [Member]
Schedule of lending-related and other commitments [Line Items]
Financing Receivable, before Allowance for Credit Loss	134,000	16,000
Loss on Sale of Investments	0	0
Affordable Housing Projects and Other [Member]
Schedule of lending-related and other commitments [Line Items]
Other Investments	205,000	219,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense	35,000	34,000	$ 34,000
Accrued Liabilities	30,000	27,000
Private SBA Loan Fund [Member]
Schedule of lending-related and other commitments [Line Items]
Equity Securities, FV-NI	3,000
Loan Pool CRA Investments [Member]
Schedule of lending-related and other commitments [Line Items]
Other Investments	$ 54,000	$ 40,000

Parent Company Only Financial_3

Parent Company Only Financial Information, Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets [Abstract]
Other Assets	$ 676,987	$ 658,604
Assets	43,023,068	41,015,855
Liabilities and Equity [Abstract]
Senior Notes	300,000	0
Subordinated Debt	550,000	550,000
Long-Term Debt, Total	1,441,442
Other Liabilities	568,485	552,814
Liabilities, Total	38,417,506	36,841,882
Preferred Stock, Including Additional Paid in Capital		194,112
Common Stock, Value, Issued		1,752
Equity, Attributable to Parent, Total	4,605,562	4,173,973	$ 4,015,490	$ 4,024,853
Liabilities and Equity	43,023,068	41,015,855
Parent Company Only
Assets [Abstract]
Cash and Due from Banks	36,158	22,473
Interest-Bearing Deposits in Banks and Other Financial Institutions	212,943	20,428
Financing Receivable, after Allowance for Credit Loss, Noncurrent	710,126	562,640
Investments in and Receivable Due from Subsidiaries	4,455,525	4,080,536
Other Assets	57,649	48,589
Assets	5,472,402	4,734,666
Liabilities and Equity [Abstract]
Senior Notes	300,000	0
Subordinated Debt	550,000	550,000
Other Long-term Debt and Capitalized Costs	(12,660)	(9,114)
Long-Term Debt, Total	837,340	540,886
Other Liabilities	29,500	19,807
Liabilities, Total	866,841	560,693
Preferred Stock, Including Additional Paid in Capital	194,112	194,112
Common Stock, Value, Issued	4,411,450	3,979,861
Equity, Attributable to Parent, Total	4,605,562	4,173,973
Liabilities and Equity	$ 5,472,402	$ 4,734,666

Parent Company Only Financial_4

Parent Company Only Financial Information, Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues [Abstract]
Interest and Fee Income, Loans and Leases	$ 1,830,241	$ 1,720,406	$ 992,642
Operating Expenses [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	134,459	206,052	459,630
Income Tax Expense (Benefit)	11,314	23,097	93,508
Net Income (Loss) Attributable to Parent, Total	123,145	182,956	366,122
Preferred Stock Dividends and Other Adjustments	11,500	11,500	11,500
Net Income (Loss) Available to Common Stockholders, Basic	111,645	171,456	354,622
Parent Company Only
Revenues [Abstract]
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	(129,224)	(192,559)	(373,581)
Interest and Fee Income, Loans and Leases	42,834	30,363	5,632
Other Operating Income	1,310	1,175	1,262
Revenues	173,368	224,097	380,475
Operating Expenses [Abstract]
Interest Expense, Debt	45,781	36,081	10,655
Other Expenses	6,727	7,352	6,118
Operating Expenses, Total	52,508	43,434	16,772
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	120,860	180,663	363,702
Income Tax Expense (Benefit)	(2,286)	(2,292)	(2,420)
Net Income (Loss) Attributable to Parent, Total	123,145	182,956	366,122
Preferred Stock Dividends and Other Adjustments	11,500	11,500	11,500
Net Income (Loss) Available to Common Stockholders, Basic	$ 111,645	$ 171,456	$ 354,622

Parent Company Only Financial_5

Parent Company Only Financial Information, Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss) Attributable to Parent	$ 123,145	$ 182,956	$ 366,122
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(16,940)	14,556	6,539
Net Cash Provided by (Used in) Operating Activities, Total	580,249	442,740	846,566
Net Cash Provided by (Used in) Investing Activities [Abstract]
Net Cash Provided by (Used in) Investing Activities, Total	(2,218,997)	(1,436,257)	(5,254,811)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from (Repayments of) Short-Term Debt	143,589	(279,157)	251,674
Proceeds from Issuance of Long-term Debt	298,800	292,740	0
Proceeds from Issuance of Common Stock	331,023	0	0
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised	37,576	4,297	11,061
Payments of Ordinary Dividends, Common Stock	139,197	129,534	123,137
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	11,500	11,500	11,500
Stockholders' Equity, Other			(938)
Net Cash Provided by (Used in) Financing Activities	1,734,529	1,295,885	4,004,185
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	95,781	302,368	(404,060)
Treasury Stock, Common [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Stockholders' Equity, Other	0	0	(938)
Performance/Service Based RSAs, RSA, [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for Repurchase of Common Stock	6,234	6,593	6,480
Parent Company Only
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss) Attributable to Parent	123,145	182,956	366,122
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Increase decrease in equity in undistributed net income loss of subsidiaries	55,776	107,441	(343,582)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	12,059	(35,863)	14,159
Net Cash Provided by (Used in) Operating Activities, Total	190,980	254,534	36,699
Net Cash Provided by (Used in) Investing Activities [Abstract]
Net (increase) in investment in subsidiary	331,023	0	0
Increase (Decrease) in Notes Receivable, Related Parties	(145,000)	(385,000)	115,000
Net Cash Provided by (Used in) Investing Activities, Total	(476,023)	(385,000)	115,000
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from (Repayments of) Short-Term Debt	0	(20,798)	(13,932)
Proceeds from Issuance of Long-term Debt	297,864	292,740	0
Proceeds from Issuance of Common Stock	331,023	0	0
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised	37,576	4,297	11,061
Payments for Repurchase of Common Stock	18,289	0	0
Payments of Ordinary Dividends, Common Stock	139,197	129,534	123,137
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	11,500	11,500	11,500
Net Cash Provided by (Used in) Financing Activities	491,243	128,612	(144,928)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	206,200	(1,854)	6,771
Cash and Cash Equivalents, at Carrying Value	42,901	44,755	37,984
Cash and Cash Equivalents, at Carrying Value	249,101	42,901	44,755
Parent Company Only | Performance/Service Based RSAs, RSA, [Member]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for Repurchase of Common Stock	$ 6,234	$ 6,593	$ 6,480

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 4,581,434	$ 3,600,892
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,747	3,860,235
Debt Securities, Held-to-Maturity, Fair Value	3,185,494	3,380,624
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,242	41,651
Assets	43,023,068	41,015,855
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Deposits, Money Market Deposits	6,637,915	6,330,453
Time Deposits	7,976,827
Deposits	34,648,434	33,446,049
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	470,369	326,780
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Other Long-Term Debt	837,635	541,269
Liabilities	38,417,506	36,841,882
Standby Letters of Credit [Member]
Liabilities, Fair Value Disclosure [Abstract]
Other Commitment	253,709	212,029
Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	31,950	32,985
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	1,452	533
Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	21,955	14,350
Equity Securities, FV-NI	10,742	31,651
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,242	41,651
FHLB and Federal Reserve Bank stocks	179,665	229,171
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	646,687	33,011
Loan, Held-for-Sale, Fair Value Disclosure	32,634	90,303
Loans and Leases Receivable, Net Amount	29,373,557	28,865,124
Loans Receivable, Fair Value Disclosure	28,327,115	27,371,086
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Servicing Asset	87,683	84,390
Assets	40,471,048	38,534,897
Assets, Fair Value Disclosure	38,871,352	36,561,249
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Interest-Bearing Domestic Deposit, Demand	9,124,741	8,843,967
Deposits, Money Market Deposits	6,637,915	6,330,453
Brokered CDs, Carrying Amount	4,276,309	4,447,479
Brokered CDs, Fair Value	4,276,309	4,447,479
Time Deposits, at Carrying Value	3,700,518	2,868,494
Time Deposits	3,700,518	2,868,494
Deposits	34,648,434	33,446,049
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	470,369	326,780
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	470,370	326,757
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Federal Home Loan Bank Borrowings, Fair Value Disclosure	1,852,685	1,944,600
Other Long-Term Debt	837,635	541,269
Long-term Debt, Fair Value	823,991	534,983
Long-term Line of Credit	2,546	2,157
Liabilities	37,991,364	36,459,407
Liabilities, Fair Value Disclosure	37,976,599	36,457,504
Fair Value, Recurring [Member] | Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	254
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		673
Fair Value, Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	327	439
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,960	8,075
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	2,976	930
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	2,457	632
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	563	2,946
Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	88,541	111,623
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	170,928	195,662
Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	4,315	2,954
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	4,106	2,746
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		35,902
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Debt Securities, Held-to-Maturity, Fair Value	999	963
US Treasury Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		35,902
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Debt Securities, Held-to-Maturity, Fair Value	999	963
US States and Political Subdivisions Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,005	91,817
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,659,722	1,682,473
Debt Securities, Held-to-Maturity, Fair Value	1,486,642	1,554,059
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,005	91,817
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,659,662	1,682,398
Debt Securities, Held-to-Maturity, Fair Value	1,486,582	1,553,984
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	110,928	1,120,794
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,227,727	2,042,675
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	110,928	1,120,794
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,227,727	2,042,675
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	324,182	345,083
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,000	16,937
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	111,475	154,793
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,000	16,937
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	111,475	154,793
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,839	133,975
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,839	133,975
US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	471	1,051
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	471	1,051
Other Debt And Other Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,989	2,950
Other Debt And Other Equity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,989	2,950
Available-for-Sale Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,581,434	3,600,892
Held-to-Maturity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,687	3,860,160
Debt Securities, Held-to-Maturity, Fair Value	3,185,434	3,380,550
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	21,955	14,350
Equity Securities, FV-NI	10,670	6,883
FHLB and Federal Reserve Bank stocks	0	0
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	0	0
Loan, Held-for-Sale, Fair Value Disclosure	0	0
Loans Receivable, Fair Value Disclosure	0	0
Life Insurance, Corporate or Bank Owned, Amount	0	0
Servicing Asset	0	0
Assets, Fair Value Disclosure	1,031,273	967,570
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	0	0
Deposits, Savings Deposits	0	0
Interest-Bearing Domestic Deposit, Demand	0	0
Deposits, Money Market Deposits	0	0
Brokered CDs, Fair Value	0	0
Time Deposits	0	0
Deposits	0	0
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	0	0
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0	0
Long-term Debt, Fair Value	0	0
Long-term Line of Credit	0	0
Liabilities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		35,902
Debt Securities, Held-to-Maturity, Fair Value	999	963
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Other Debt And Other Equity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] | Available-for-Sale Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	35,902
Fair Value, Inputs, Level 1 [Member] | Held-to-Maturity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	999	963
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
FHLB and Federal Reserve Bank stocks	179,665	229,171
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Other Long-Term Debt	837,635	541,269
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	0	0
Interest-Bearing Deposits in Banks and Other Financial Institutions	0	0
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	0	0
Equity Securities, FV-NI	0	0
FHLB and Federal Reserve Bank stocks	179,665	229,171
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	646,687	33,011
Loan, Held-for-Sale, Fair Value Disclosure	32,634	90,303
Loans Receivable, Fair Value Disclosure	0	0
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Servicing Asset	0	0
Assets, Fair Value Disclosure	9,412,129	8,102,995
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	0	0
Deposits, Savings Deposits	0	0
Interest-Bearing Domestic Deposit, Demand	0	0
Deposits, Money Market Deposits	0	0
Brokered CDs, Fair Value	4,276,309	4,447,479
Time Deposits	3,700,518	2,868,494
Deposits	7,976,827	7,315,973
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	470,370	326,757
Federal Home Loan Bank Borrowings, Fair Value Disclosure	1,852,685	1,944,600
Long-term Debt, Fair Value	823,991	534,983
Long-term Line of Credit	2,546	2,157
Liabilities, Fair Value Disclosure	11,304,992	10,326,755
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,960	8,075
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	2,976	930
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,457	632
Foreign Currency Contract, Asset, Fair Value Disclosure	2,457	632
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	563	2,946
Foreign Currency Contracts, Liability, Fair Value Disclosure	563	2,946
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	88,541	111,623
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	170,928	195,662
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	4,315	2,954
Foreign Currency Contract, Asset, Fair Value Disclosure	4,315	2,954
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	4,106	2,746
Foreign Currency Contracts, Liability, Fair Value Disclosure	4,106	2,746
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,005	91,817
Debt Securities, Held-to-Maturity, Fair Value	1,486,582	1,553,984
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	110,928	1,120,794
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,227,727	2,042,675
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,000	16,937
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	111,475	154,793
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Fair Value, Inputs, Level 2 [Member] | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,839	133,975
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	471	1,051
Fair Value, Inputs, Level 2 [Member] | Other Debt And Other Equity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,989	2,950
Fair Value, Inputs, Level 2 [Member] | Available-for-Sale Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,581,434	3,564,990
Fair Value, Inputs, Level 2 [Member] | Held-to-Maturity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	3,184,435	3,379,586
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	72	24,769	$ 19,225
Loans and Leases Receivable, Net Amount	29,405,041	28,865,124
Derivative Assets	254
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	0	0
Interest-Bearing Deposits in Banks and Other Financial Institutions	0	0
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	0	0
Equity Securities, FV-NI	72	24,769
FHLB and Federal Reserve Bank stocks	0	0
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	0	0
Loan, Held-for-Sale, Fair Value Disclosure	0	0
Loans Receivable, Fair Value Disclosure	28,327,115	27,371,086
Life Insurance, Corporate or Bank Owned, Amount	0	0
Servicing Asset	87,683	84,390
Assets, Fair Value Disclosure	28,415,450	27,480,684
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Interest-Bearing Domestic Deposit, Demand	9,124,741	8,843,967
Deposits, Money Market Deposits	6,637,915	6,330,453
Brokered CDs, Fair Value	0	0
Time Deposits	0	0
Deposits	26,671,607	26,130,076
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	0	0
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0	0
Long-term Debt, Fair Value	0	0
Long-term Line of Credit	0	0
Liabilities, Fair Value Disclosure	26,671,607	26,130,749
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	254
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		673
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	327	439
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	580	439
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Other Debt And Other Equity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-Sale Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] | Held-to-Maturity Securities [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, NAV [Member] | Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	$ 12,500	$ 10,000

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Derivative Financial Instruments, Assets [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ 439	$ 86
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	11,771	6,557
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	(8,816)	(4,171)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	(3,068)	(2,033)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Derivative Assets And Liabilities, Net Mortgage Derivative Gain (Loss) Included In Earnings.	(113)	352
Ending Balance	327	439
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	673	46
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	(4,000)	(1,816)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	3,512	2,494
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	(438)	(51)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Derivative Assets And Liabilities, Net Mortgage Derivative Gain (Loss) Included In Earnings.	(927)	627
Ending Balance	(254)	673
Derivative [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	(234)	40
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	15,771	8,373
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	(12,328)	(6,665)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings	(2,630)	(1,982)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis, Derivative Assets And Liabilities, Net Mortgage Derivative Gain (Loss) Included In Earnings.	814	(274)
Ending Balance	$ 580	$ (234)

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Securities without Readily Determinable Fair Value [Line Items]
Equity Securities, FV-NI	$ 72	$ 24,769	$ 19,225
Equity Securities, FV-NI, Realized Gain (Loss)	4,054	5,861
Payments to Acquire Equity Securities, FV-NI	22	11
Proceeds from Sale of Equity Securities, FV-NI	$ (28,772)	$ (329)

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, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities without Readily Determinable Fair Value, Amount	$ 13,000	$ 35,000
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	0	5,785	$ 5,690
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate	276	3,139
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount	1,067	2,532
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Individually Evaluated for Credit Loss	31,483	47,221
Provision for Loan and Lease Losses	$ 17,454	45,709
Equity Securities without Readily Determinable Fair Value, Amount		24,671
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount		$ 5,785

Fair Value Measurements, Unobse

Fair Value Measurements, Unobservable Inputs, Readily Quantifiable to Level 3 (details) - Fair Value, Inputs, Level 3 [Member]	12 Months Ended
	Dec. 31, 2024
Valuation Technique, Discounted Cash Flow [Member] | Servicing Contracts [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	5%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	0%
Valuation Technique, Discounted Cash Flow [Member] | Servicing Contracts [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [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 [Member] | Servicing Contracts [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	5%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	4%
Valuation Technique, Discounted Cash Flow [Member] | Interest Rate Lock Commitments [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	55%
Valuation Technique, Discounted Cash Flow [Member] | Interest Rate Lock Commitments [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [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 [Member] | Interest Rate Lock Commitments [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	92%
Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	0%
Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	77%
Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	61%

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Banking Regulation, Total Capital, Actual	$ 4,282,597	$ 3,997,205
Banking Regulation, Total Risk-Based Capital Ratio, Actual	12.61%	12.21%
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 2,716,014	$ 2,618,596
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum	8%	8%
Banking Regulation, Tier 1 Risk-Based Capital, Actual	$ 3,590,948	$ 3,269,050
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual	10.58%	9.99%
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 2,037,010	$ 1,963,947
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	6%	6%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual	$ 3,396,836	$ 3,074,938
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual	10.01%	9.39%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 1,527,758	$ 1,472,960
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	4.50%	4.50%
Banking Regulation, Tier 1 Leverage Capital, Actual	$ 3,590,948	$ 3,269,050
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual	8.73%	8.06%
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum	$ 1,644,627	$ 1,622,053
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum	4%	4%
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Banking Regulation, Total Capital, Actual	$ 4,078,042	$ 3,803,052
Banking Regulation, Total Risk-Based Capital Ratio, Actual	12.03%	11.64%
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 2,710,815	$ 2,614,469
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum	8%	8%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum	$ 3,388,519	$ 3,268,086
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum	10%	10%
Banking Regulation, Tier 1 Risk-Based Capital, Actual	$ 3,425,721	$ 3,167,182
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual	10.11%	9.69%
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 2,033,111	$ 1,960,852
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	6%	6%
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum	$ 2,710,815	$ 2,614,469
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	8%	8%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual	$ 3,425,721	$ 3,167,182
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual	10.11%	9.69%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 1,524,833	$ 1,470,639
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	4.50%	4.50%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum	$ 2,202,537	$ 2,124,256
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	6.50%	6.50%
Banking Regulation, Tier 1 Leverage Capital, Actual	$ 3,425,721	$ 3,167,182
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual	8.34%	7.82%
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum	$ 1,642,484	$ 1,620,970
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum	4%	4%
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum	$ 2,053,105	$ 2,026,212
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum	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, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 123,145	$ 182,956	$ 366,122
Preferred Stock Dividends and Other Adjustments	(11,500)	(11,500)	(11,500)
Net Income (Loss) Available to Common Stockholders, Basic	111,645	171,456	354,622
Dividends, Common Stock	(138,508)	(128,748)	(122,417)
Unvested Share based Payment Awards	(689)	(785)	(720)
Undistributed Earnings, Basic, Total	(27,552)	41,922	231,485
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	(27,552)	41,675	229,995
Undistributed Earnings Allocated To Unvested Share Based Payment Awards	0	247	1,490
Earnings Per Share, Basic [Abstract]
Distributed Earnings	138,508	128,748	122,417
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	(27,552)	41,675	229,995
Common Shareholders Earnings Basic	110,956	170,424	352,412
Earnings Per Share, Diluted [Abstract]
Distributed Earnings To Common Shareholders Diluted	138,508	128,748	122,417
Undistributed Earnings, Diluted	(27,552)	41,675	229,995
Common Shareholders Earnings Diluted	$ 110,956	$ 170,424	$ 352,412
Weighted Average Number of Shares Outstanding, Basic	151,933	149,968	149,162
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements	1,415	892	1,334
Weighted Average Number of Shares Outstanding, Diluted	153,347	150,860	150,496
Earnings Per Share, Basic	$ 0.73	$ 1.14	$ 2.36
Earnings Per Share, Diluted	$ 0.72	$ 1.13	$ 2.34

Earnings Per Common Share Narra

Earnings Per Common Share Narrative (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2	3	2

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Interest Income (Expense), Operating	$ 1,047,248	$ 1,039,573	$ 957,321
Noninterest Income	(9,407)	63,182	282,370
Provision for Loan, Lease, and Other Losses	84,986	83,021	32,998
Interest Income (Expense), after Provision for Loan Loss	962,263	956,552	924,323
Labor and Related Expense	487,956	468,355	454,101
Information Technology and Data Processing	107,563	102,018	90,700
Occupancy, Net	54,622	57,204	59,794
Marketing and Advertising Expense	28,142	28,405	25,525
Equipment Expense	18,431	19,663	19,632
Professional Fees	21,601	19,911	18,250
Payments of Financing Costs	8,471	5,408	5,925
Federal Deposit Insurance Corporation Premium Expense	38,439	67,072	22,650
Amortization of Intangible Assets	8,811	8,811	8,811
FHLB Advances, Prepayment Penalty	14,243
Other Noninterest Expense	30,118	36,837	41,675
Noninterest Expense	818,397	813,682	747,063
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	134,459	206,052	459,630
Income Tax Expense (Benefit)	11,314	23,097	93,508
Net Income (Loss)	123,145	182,956	366,122
Loans and Leases Receivable, Net of Deferred Income	29,768,586	29,216,218
Goodwill	1,104,992	1,104,992
Assets	43,023,068	41,015,855
Gain (Loss) on Sale of Mortgage Loans_narrative	(130,000)	(136,000)
Gain (Loss) on Sale of Investments	148,000	65,000
FDIC Special Assessment		31,000
Corporate and Commercial Specialty [Member]
Segment Reporting Information [Line Items]
A portion of total depreciation Technology expense	242	164	15
Community, Consumer and Business [Member]
Segment Reporting Information [Line Items]
A portion of total depreciation Occupancy expense	10,000	8,000	4,000
Risk Management and Shared Services [Member]
Segment Reporting Information [Line Items]
A portion of total depreciation Equipment expense	39,000	39,000	41,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Operating	1,047,248	1,039,573	957,321
Net intersegment interest income (expense)	0	0	0
Segment net interest income	1,047,248	1,039,573	957,321
Noninterest Income	(9,407)	63,182	282,370
Interest income (expense) before provision	1,037,841	1,102,756	1,239,691
Provision for Loan, Lease, and Other Losses	84,986	83,021	32,998
Interest Income (Expense), after Provision for Loan Loss	952,855	1,019,734	1,206,693
Labor and Related Expense	487,956	468,355	454,101
Information Technology and Data Processing	107,563	102,018	90,700
Occupancy, Net	54,622	57,204	59,794
Marketing and Advertising Expense	28,142	28,405	25,525
Equipment Expense	18,431	19,663	19,632
Professional Fees	21,601	19,911	18,250
Payments of Financing Costs	8,471	5,408	5,925
Federal Deposit Insurance Corporation Premium Expense	38,439	67,072	22,650
Amortization of Intangible Assets	8,811	8,811	8,811
FHLB Advances, Prepayment Penalty	14,243
Other Noninterest Expense	30,118	36,837	41,675
Allocated indirect expense	0	0	0
Noninterest Expense	818,397	813,682	747,063
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	134,459	206,052	459,630
Income Tax Expense (Benefit)	11,314	23,097	93,508
Net Income (Loss)	123,145	182,956	366,122
Loans and Leases Receivable, Net of Deferred Income	29,768,586	29,216,218	28,799,569
Goodwill	1,104,992	1,104,992	1,104,992
Assets	43,023,068	41,015,855	39,405,727
Operating Segments [Member] | Corporate and Commercial Specialty [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Operating	976,878	933,929	526,870
Net intersegment interest income (expense)	(429,917)	(432,073)	(118,059)
Segment net interest income	546,961	501,856	408,811
Noninterest Income	53,435	51,905	58,938
Interest income (expense) before provision	600,396	553,761	467,749
Provision for Loan, Lease, and Other Losses	66,390	54,302	47,939
Interest Income (Expense), after Provision for Loan Loss	534,006	499,459	419,810
Labor and Related Expense	79,853	71,688	71,043
Information Technology and Data Processing	2,594	2,931	3,029
Occupancy, Net	0	0	0
Marketing and Advertising Expense	3,543	4,042	3,703
Equipment Expense	2	1	1
Professional Fees	825	1,359	1,025
Payments of Financing Costs	1,100	877	528
Federal Deposit Insurance Corporation Premium Expense	0	0	0
Amortization of Intangible Assets	0	0	0
FHLB Advances, Prepayment Penalty	0
Other Noninterest Expense	3,338	3,501	3,350
Allocated indirect expense	88,036	83,190	73,548
Noninterest Expense	179,291	167,589	156,227
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	354,715	331,870	263,583
Income Tax Expense (Benefit)	64,346	59,143	47,440
Net Income (Loss)	290,369	272,727	216,143
Loans and Leases Receivable, Net of Deferred Income	16,959,921	16,045,897	17,083,254
Goodwill	525,836	525,836	525,836
Assets	17,794,372	16,897,021	17,909,477
Operating Segments [Member] | Community, Consumer and Business [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Operating	247,791	309,291	362,420
Net intersegment interest income (expense)	579,587	487,897	190,862
Segment net interest income	827,378	797,188	553,282
Noninterest Income	198,485	193,948	205,660
Interest income (expense) before provision	1,025,863	991,136	758,942
Provision for Loan, Lease, and Other Losses	24,759	29,757	22,359
Interest Income (Expense), after Provision for Loan Loss	1,001,104	961,379	736,583
Labor and Related Expense	232,787	236,385	238,962
Information Technology and Data Processing	47,241	44,661	33,330
Occupancy, Net	61	95	82
Marketing and Advertising Expense	3,169	4,001	3,428
Equipment Expense	5,930	5,770	5,365
Professional Fees	1,978	1,933	4,209
Payments of Financing Costs	5,018	3,065	4,308
Federal Deposit Insurance Corporation Premium Expense	0	0	0
Amortization of Intangible Assets	0	0	0
FHLB Advances, Prepayment Penalty	0
Other Noninterest Expense	27,921	29,800	31,720
Allocated indirect expense	205,979	191,613	173,645
Noninterest Expense	530,084	517,323	495,049
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	471,020	444,056	241,534
Income Tax Expense (Benefit)	97,460	91,770	49,347
Net Income (Loss)	373,560	352,286	192,187
Loans and Leases Receivable, Net of Deferred Income	12,318,648	12,642,123	11,231,404
Goodwill	579,156	579,156	579,156
Assets	13,892,891	13,453,475	12,073,694
Operating Segments [Member] | Risk Management and Shared Services [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Operating	(177,421)	(203,647)	68,031
Net intersegment interest income (expense)	(149,670)	(55,824)	(72,803)
Segment net interest income	(327,091)	(259,471)	(4,772)
Noninterest Income	(261,327)	(182,671)	17,772
Interest income (expense) before provision	(588,418)	(442,142)	12,999
Provision for Loan, Lease, and Other Losses	(6,163)	(1,038)	(37,300)
Interest Income (Expense), after Provision for Loan Loss	(582,255)	(441,104)	50,299
Labor and Related Expense	175,316	160,282	144,096
Information Technology and Data Processing	57,728	54,426	54,341
Occupancy, Net	54,561	57,109	59,712
Marketing and Advertising Expense	21,430	20,362	18,394
Equipment Expense	12,499	13,892	14,266
Professional Fees	18,798	16,619	13,016
Payments of Financing Costs	2,353	1,466	1,089
Federal Deposit Insurance Corporation Premium Expense	38,439	67,072	22,650
Amortization of Intangible Assets	8,811	8,811	8,811
FHLB Advances, Prepayment Penalty	14,243
Other Noninterest Expense	(1,141)	3,534	6,605
Allocated indirect expense	(294,015)	(274,803)	(247,193)
Noninterest Expense	109,022	128,770	95,787
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(691,277)	(569,873)	(45,488)
Income Tax Expense (Benefit)	(150,492)	(127,816)	(3,279)
Net Income (Loss)	(540,785)	(442,057)	(42,209)
Loans and Leases Receivable, Net of Deferred Income	490,017	528,198	484,911
Goodwill	0	0	0
Assets	$ 11,335,805	$ 10,665,359	$ 9,422,556

Segment Reporting (Details Text

Segment Reporting (Details Textuals)	12 Months Ended
	Dec. 31, 2024 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, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (171,096)
Net unrealized (losses) on AFS securities transferred to HTM, prior to transfer	0	$ 0	$ (67,604)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	(8,360)	(9,025)	(9,870)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(21,537)	(13,254)	3,626
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	16,478	13,930	(212)
Labor and Related Expense	(487,956)	(468,355)	(454,101)
Other Comprehensive Income (Loss), Net of Tax, Total	96,681	101,703	(262,483)
Ending Balance		(171,096)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(148,641)	(233,192)	(5,266)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(23,978)	41,145	(250,273)
Net unrealized (losses) on AFS securities transferred to HTM, prior to transfer			(67,604)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	148,380	64,940	1,922
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	(8,360)	(9,025)	(9,870)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	0	0
Labor and Related Expense	0	0	0
Other Expenses	0	0	0
Other Comprehensive Income (Loss), Tax	(33,114)	(30,560)	78,159
Other Comprehensive Income (Loss), Net of Tax, Total	99,648	84,550	(227,926)
Ending Balance	(48,993)	(148,641)	(233,192)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,080	3,360	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	0
Net unrealized (losses) on AFS securities transferred to HTM, prior to transfer			0
Debt Securities, Available-for-Sale, Realized Gain (Loss)	0	0	0
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	0	0	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(21,537)	(13,254)	3,626
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	16,478	13,930	(212)
Labor and Related Expense	0	0	0
Other Expenses	0	0	0
Other Comprehensive Income (Loss), Tax	710	(956)	(54)
Other Comprehensive Income (Loss), Net of Tax, Total	(4,348)	(280)	3,360
Ending Balance	(1,268)	3,080	3,360
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(25,535)	(42,968)	(5,051)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2,210	24,091	(51,745)
Net unrealized (losses) on AFS securities transferred to HTM, prior to transfer			0
Debt Securities, Available-for-Sale, Realized Gain (Loss)	0	0	0
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	0	0	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	0	0
Labor and Related Expense	(290)	(326)	(325)
Other Expenses	(28)	(29)	658
Other Comprehensive Income (Loss), Tax	(511)	(6,304)	13,495
Other Comprehensive Income (Loss), Net of Tax, Total	1,381	17,432	(37,917)
Ending Balance	(24,154)	(25,535)	(42,968)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(171,096)	(272,799)	(10,317)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(21,768)	65,236	(302,018)
Net unrealized (losses) on AFS securities transferred to HTM, prior to transfer			(67,604)
Debt Securities, Available-for-Sale, Realized Gain (Loss)	148,380	64,940	1,922
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	(8,360)	(9,025)	(9,870)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(21,537)	(13,254)	3,626
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	16,478	13,930	(212)
Labor and Related Expense	(290)	(326)	(325)
Other Expenses	(28)	(29)	658
Other Comprehensive Income (Loss), Tax	(32,915)	(37,820)	91,601
Other Comprehensive Income (Loss), Net of Tax, Total	96,681	101,703	(262,483)
Ending Balance	$ (74,416)	$ (171,096)	$ (272,799)

Revenues Revenue Recognition by

Revenues Revenue Recognition by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Noninterest Income	$ (9,407)	$ 63,182	$ 282,370
Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	92,569	82,502	84,122
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	51,642	49,045	62,310
Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	199,518	186,560	201,953
Noninterest Income, Outside of Scope of Topic 606	(208,925)	(123,377)	80,417
Noninterest Income	(9,407)	63,182	282,370
Operating Segments [Member] | Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	92,569	82,502	84,122
Operating Segments [Member] | Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	51,642	49,045	62,310
Operating Segments [Member] | Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	47,027	45,121	44,132
Operating Segments [Member] | Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	8,280	9,891	11,389
Operating Segments [Member] | Corporate and Commercial Specialty [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	13,594	12,498	15,317
Noninterest Income, Outside of Scope of Topic 606	39,841	39,407	43,621
Noninterest Income	53,435	51,905	58,938
Operating Segments [Member] | Corporate and Commercial Specialty [Member] | Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	0	0	0
Operating Segments [Member] | Corporate and Commercial Specialty [Member] | Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	11,627	10,191	12,479
Operating Segments [Member] | Corporate and Commercial Specialty [Member] | Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	1,652	1,348	1,104
Operating Segments [Member] | Corporate and Commercial Specialty [Member] | Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	315	959	1,734
Operating Segments [Member] | Community, Consumer and Business [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	185,936	173,246	185,151
Noninterest Income, Outside of Scope of Topic 606	12,549	20,702	20,510
Noninterest Income	198,485	193,948	205,660
Operating Segments [Member] | Community, Consumer and Business [Member] | Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	92,569	82,502	84,122
Operating Segments [Member] | Community, Consumer and Business [Member] | Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	39,977	38,831	49,813
Operating Segments [Member] | Community, Consumer and Business [Member] | Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	45,287	43,745	42,917
Operating Segments [Member] | Community, Consumer and Business [Member] | Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	8,103	8,168	8,299
Operating Segments [Member] | Risk Management and Shared Services [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	(12)	815	1,485
Noninterest Income, Outside of Scope of Topic 606	(261,315)	(183,486)	16,286
Noninterest Income	(261,327)	(182,671)	17,772
Operating Segments [Member] | Risk Management and Shared Services [Member] | Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	0	0	0
Operating Segments [Member] | Risk Management and Shared Services [Member] | Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	38	23	18
Operating Segments [Member] | Risk Management and Shared Services [Member] | Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	88	28	111
Operating Segments [Member] | Risk Management and Shared Services [Member] | Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Noninterest Income In Scope of Topic 606	$ (138)	$ 764	$ 1,356

Recent Developments (Details)

Recent Developments (Details) - $ / shares	Jan. 28, 2025	Jun. 01, 2020	Sep. 19, 2018
Series E Preferred Stock [Member]
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage			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. 28, 2025
Subsequent Event [Member] | Common Stock [Member]
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 17, 2025
Dividends Payable, Date of Record	Mar. 03, 2025
Subsequent Event [Member] | Common Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.23
Subsequent Event [Member] | Series E Preferred Stock [Member]
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 17, 2025
Dividends Payable, Date of Record	Mar. 03, 2025
Subsequent Event [Member] | Series E Preferred Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.3671875
Preferred Stock, Dividend Rate, Percentage	5.875%
Subsequent Event [Member] | Series F Preferred Stock [Member]
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 17, 2025
Dividends Payable, Date of Record	Mar. 03, 2025
Subsequent Event [Member] | Series F Preferred Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.3515625
Preferred Stock, Dividend Rate, Percentage	5.625%

Uncategorized Items - asb-20241

Label	Element	Value
Other Postretirement Benefits Plan [Member]
Retirement Benefits [Text Block]	us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock	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 2024 and 2023 consolidated balance sheets for the RAP and Postretirement Plan were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2024 2024 2023 2023 Change in fair value of plan assets Fair value of plan assets at beginning of year $ 453,457 $ — $ 407,405 $ — Actual return on plan assets 43,676 — 60,565 — Employer contributions — 183 — 171 Gross benefits paid (18,163) (183) (14,513) (171) Fair value of plan assets at end of year (a) $ 478,970 $ — $ 453,457 $ — Change in benefit obligation Net benefit obligation at beginning of year $ 211,353 $ 1,425 $ 208,315 $ 1,530 Service cost 3,027 — 3,189 — Interest cost 11,173 73 10,887 78 Actuarial loss (gain) 5,975 729 3,475 (12) Gross benefits paid (18,163) (183) (14,513) (171) Net benefit obligation at end of year (a) $ 213,365 $ 2,043 $ 211,353 $ 1,425 Funded (unfunded) status $ 265,605 $ (2,043) $ 242,104 $ (1,425) Noncurrent assets $ 265,605 $ — $ 242,104 $ — Current liabilities — (212) — (158) Noncurrent liabilities — (1,832) — (1,267) Asset (liability) recognized on the consolidated balance sheets $ 265,605 $ (2,043) $ 242,104 $ (1,425) (a) The fair value of the plan assets represented 224% and 215% of the net benefit obligation of the pension plan at December 31, 2024 and 2023, respectively. Amounts recognized in accumulated other comprehensive (income) loss, net of tax, were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2024 2024 2023 2023 Prior service cost $ (723) $ (252) $ (884) $ (308) Net actuarial loss (gain) 24,758 267 27,089 (301) Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss $ 24,035 $ 15 $ 26,204 $ (609) Other changes in plan assets and benefit obligations recognized in OCI, net of tax were as follows: RAP Postretirement RAP Postretirement ($ in thousands) 2024 2024 2023 2023 Net actuarial gain (loss) $ 3,102 $ (729) $ 24,228 $ 12 Amortization of prior service cost (215) (75) (250) (75) Amortization of actuarial loss (gain) — (28) — (29) Income tax (expense) benefit (718) 208 (6,327) 23 Total recognized in OCI $ 2,169 $ (624) $ 17,650 $ (68) The components of net periodic pension cost for the RAP were as follows: ($ in thousands) 2024 2023 2022 Service cost $ 3,027 $ 3,189 $ 3,670 Interest cost 11,173 10,887 7,152 Expected return on plan assets (34,599) (32,862) (26,903) Amortization of prior service cost (215) (250) (250) Amortization of actuarial loss — — 658 Total net periodic pension (income) $ (20,614) $ (19,037) $ (15,673) The components of net periodic benefit cost for the Postretirement Plan were as follows: ($ in thousands) 2024 2023 2022 Interest cost $ 73 $ 78 $ 53 Amortization of prior service cost (75) (75) (75) Amortization of actuarial (gain) (28) (29) — Total net periodic benefit (income) $ (31) $ (26) $ (22) 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 2024 2024 2023 2023 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 3.81 % N/A 3.77 % N/A Weighted average assumptions used to determine net periodic benefit costs Discount rate 5.40 % 5.40 % 5.40 % 5.40 % Rate of increase in compensation levels 2.50 % N/A 2.50 % N/A Expected long-term rate of return on plan assets 7.40 % N/A 7.30 % 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 10.16% and 15.80% for 2024 and 2023, 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, 2024 and 2023 measurement dates, respectively, by asset category were as follows: Asset Category 2024 2023 Equity securities 55 % 54 % Fixed-income securities 35 % 34 % Group annuity contracts 8 % 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 tables summarize the fair value of the RAP’s investments: Fair Value Measurements Using ($ in thousands) December 31, 2024 Level 1 Level 2 Level 3 RAP investments Money market account $ 7,892 $ 7,892 $ — $ — Common /collective trust funds 183,059 183,059 — — Mutual funds 247,602 247,602 — — Group annuity contract 40,416 — — 40,416 Total RAP investments $ 478,970 $ 438,554 $ — $ 40,416 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 contract 43,687 — — 43,687 Total RAP investments $ 453,457 $ 409,771 $ — $ 43,687 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 2024 2023 Fair value of group annuity contract at beginning of period $ 43,687 $ 40,939 Return on plan assets (731) 5,313 Benefits paid (2,539) (2,565) Fair value of group annuity contract at end of period $ 40,416 $ 43,687 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 2024 and 2023. 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, 2024, reflecting expected future services, were as follows: ($ in thousands) RAP Postretirement Plan Estimated future benefit payments 2025 $ 22,579 $ 217 2026 21,689 213 2027 20,165 208 2028 20,135 203 2029 20,179 196 2030-2034 84,031 856 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 2024 health care premium rates for post-65 coverage was an increase of 35.72%. The health care trend rate assumption for post-65 coverage assumes a 6.00% rate of increase for 2025, declining to an ultimate trend rate of 5.00% by the year 2031. 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 $17 million, $16 million, and $15 million for 2024, 2023, and 2022, respectively.