Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest and Dividend Income, Operating [Abstract]
Interest and Fee Income, Loans and Leases	$ 1,782,390	$ 1,830,241	$ 1,720,406
Interest and Dividend Income, Securities, by Taxable Status [Abstract]
Interest Income, Securities, Operating, Taxable	288,200	198,579	146,006
Interest Income, Securities, Operating, Tax Exempt	55,598	58,572	63,233
Other Interest and Dividend Income	46,568	35,312	28,408
Interest and Dividend Income, Operating, Total	2,172,756	2,122,704	1,958,052
Interest Expense, Operating and Nonoperating [Abstract]
Interest Expense, Deposits	803,918	901,804	673,624
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase	10,415	11,754	12,238
Interest Expense, Other Short-Term Borrowings	1,016	17,597	1
Interest on FHLB Funding	113,253	98,520	196,535
Interest Expense, Long-Term Debt	43,009	45,781	36,080
Interest Expense, Operating and Nonoperating, Total	971,611	1,075,456	918,479
Interest Income (Expense), Operating, Total	1,201,145	1,047,248	1,039,573
Provision for Loan, Lease, and Other Losses	53,996	84,986	83,021
Interest Income (Expense), after Provision for Loan Loss, Total	1,147,149	962,263	956,552
Noninterest Income [Abstract]
Capital Market Fees Net	32,048	22,084	24,649
Fees and Commissions, Mortgage Banking and Servicing	14,502	10,686	19,429
Gain (Loss) on Sale of Mortgage Loans	(6,976)	(130,406)	(136,239)
Bank Owned Life Insurance Income	17,195	13,477	10,266
Gain (Loss) on Disposition of Assets	1,565	(1,042)	454
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	49	(144,147)	(58,903)
Noninterest Income, Other Operating Income	9,944	9,310	9,691
Noninterest Income, Total	286,400	(9,407)	63,182
Noninterest Expense [Abstract]
Labor and Related Expense	521,723	487,956	468,355
Information Technology and Data Processing	110,877	107,563	102,018
Occupancy, Net	55,011	54,622	57,204
Marketing and Advertising Expense	31,614	28,142	28,405
Equipment Expense	20,277	18,431	19,663
Professional Fees	23,934	21,601	19,911
Payments of Loan Costs	8,264	8,471	5,408
Federal Deposit Insurance Corporation Premium Expense	36,713	38,439	67,072
Amortization of Intangible Assets	8,811	8,811	8,811
Loss on prepayments of FHLB advances	0	14,243	0
Prepayment Fees on Advances, Net	0	14,243	0
Other Noninterest Expense	38,415	30,118	36,837
Noninterest Expense, Total	855,639	818,397	813,682
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	577,910	134,459	206,052
Income Tax Expense (Benefit)	103,133	11,314	23,097
Net Income (Loss) Attributable to Parent, Total	474,777	123,145	182,956
Preferred Stock Dividends and Other Adjustments	11,500	11,500	11,500
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ 463,277	$ 111,645	$ 171,456
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 2.79	$ 0.73	$ 1.14
Earnings Per Share, Diluted	$ 2.77	$ 0.72	$ 1.13
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	165,079	151,933	149,968
Weighted Average Number of Shares Outstanding, Diluted	166,613	153,347	150,860
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	$ 96,579	$ 92,569	$ 82,502
Deposit Account [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	53,649	51,642	49,045
Credit and Debit Card [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	46,629	46,921	45,020
Financial Service, Other [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 21,216	$ 19,499	$ 17,268