Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Interest and Dividend Income, Operating [Abstract]
Interest and Fee Income, Loans and Leases	$ 447,781	$ 456,788	$ 881,080	$ 911,260
Interest and Dividend Income, Securities, by Taxable Status [Abstract]
Interest Income, Securities, Operating, Taxable	71,174	50,278	140,962	96,826
Interest Income, Securities, Operating, Tax Exempt	13,902	14,669	27,858	29,443
Other Interest and Dividend Income	12,679	8,539	21,921	16,133
Interest and Dividend Income, Operating, Total	545,536	530,274	1,071,821	1,053,662
Interest Expense, Operating and Nonoperating [Abstract]
Interest Expense, Deposits	197,656	221,062	406,796	447,293
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase	2,004	2,303	5,626	5,166
Interest Expense, Other Short-Term Borrowings	287	6,077	695	10,785
Interest on FHLB Funding	34,889	34,143	50,979	55,814
Interest Expense, Long-Term Debt	10,700	10,096	21,785	20,154
Interest Expense, Operating and Nonoperating, Total	245,536	273,681	485,881	539,211
Interest Income (Expense), Operating, Total	300,000	256,593	585,940	514,451
Provision for Loan, Lease, and Other Losses	17,996	23,008	30,999	47,009
Interest Income (Expense), after Provision for Loan Loss, Total	282,004	233,585	554,941	467,442
Noninterest Income [Abstract]
Capital Market Fees Net	5,765	4,685	10,110	8,735
Fees and Commissions, Mortgage Banking and Servicing	4,213	2,505	8,035	5,166
Gain (Loss) on Sale of Mortgage Loans	0	0	(6,976)	0
Bank Owned Life Insurance Income	4,135	4,584	9,339	7,154
Gain (Loss) on Disposition of Assets	(1,735)	(627)	(2,613)	(933)
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	7	67	11	3,947
Noninterest Income, Other Operating Income	2,226	2,222	4,477	4,549
Noninterest Income, Total	66,977	65,159	125,754	130,144
Noninterest Expense [Abstract]
Labor and Related Expense	126,994	121,581	250,890	240,976
Information Technology and Data Processing	26,508	27,161	53,646	53,362
Occupancy, Net	12,644	13,128	28,025	26,761
Marketing and Advertising Expense	7,748	7,535	14,134	14,052
Equipment Expense	4,494	4,450	9,021	9,049
Professional Fees	6,674	4,429	12,757	9,101
Payments of Financing Costs	2,705	1,793	5,299	3,771
Federal Deposit Insurance Corporation Premium Expense	9,708	7,131	20,144	21,077
Amortization of Intangible Assets	2,203	2,203	4,405	4,405
Other Noninterest Expense	9,674	6,450	21,648	10,963
Noninterest Expense, Total	209,352	195,861	419,971	393,518
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	139,629	102,884	260,724	204,068
Income Tax Expense (Benefit)	28,399	(12,689)	47,808	7,326
Net Income (Loss) Attributable to Parent, Total	111,230	115,573	212,916	196,742
Preferred Stock Dividends and Other Adjustments	2,875	2,875	5,750	5,750
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ 108,355	$ 112,698	$ 207,166	$ 190,992
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.65	$ 0.75	$ 1.25	$ 1.27
Earnings Per Share, Diluted	$ 0.65	$ 0.74	$ 1.24	$ 1.26
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	164,936	149,872	165,081	149,864
Weighted Average Number of Shares Outstanding, Diluted	166,343	151,288	166,506	151,310
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	$ 23,025	$ 22,628	$ 45,522	$ 44,323
Deposit Account [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	13,147	12,263	25,961	24,702
Credit and Debit Card [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	11,200	11,975	21,642	23,242
Financial Service, Other [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	$ 4,995	$ 4,857	$ 10,245	$ 9,259