Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Interest and Dividend Income, Operating [Abstract]
Interest and Fee Income, Loans and Leases	$ 506,528	$ 447,781	$ 933,516	$ 881,080
Interest and Dividend Income, Securities, by Taxable Status [Abstract]
Interest Income, Securities, Operating, Taxable	88,347	71,174	164,023	140,962
Interest Income, Securities, Operating, Tax Exempt	13,725	13,902	27,463	27,858
Other Interest and Dividend Income	14,694	12,679	26,335	21,921
Interest and Dividend Income, Operating, Total	623,294	545,536	1,151,337	1,071,821
Interest Expense, Operating and Nonoperating [Abstract]
Interest Expense, Deposits	203,765	197,656	379,038	406,796
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase	4,085	2,004	7,818	5,626
Interest Expense, Other Short-Term Borrowings	190	287	306	695
Interest on FHLB Funding	35,052	34,889	66,621	50,979
Interest Expense, Long-Term Debt	10,163	10,700	20,326	21,785
Interest Expense, Operating and Nonoperating, Total	253,255	245,536	474,109	485,881
Interest Income (Expense), Operating, Total	370,039	300,000	677,228	585,940
Provision for Loan, Lease, and Other Losses	19,388	17,996	30,389	30,999
Interest Income (Expense), after Provision for Loan Loss, Total	350,651	282,004	646,839	554,941
Noninterest Income [Abstract]
Capital Market Fees Net	7,476	5,765	14,018	10,110
Fees and Commissions, Mortgage Banking and Servicing	2,777	4,213	8,888	8,035
Gain (Loss) on Sale of Mortgage Loans	0	0	0	(6,976)
Bank Owned Life Insurance Income	4,615	4,135	8,430	9,339
Gain (Loss) on Disposition of Assets	789	(1,735)	1,629	(2,613)
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	35	7	6	11
Noninterest Income, Other Operating Income	2,707	2,226	5,571	4,477
Noninterest Income, Total	80,398	66,977	156,256	125,754
Noninterest Expense [Abstract]
Labor and Related Expense	161,168	126,994	296,341	250,890
Information Technology and Data Processing	32,867	26,508	62,603	53,646
Occupancy, Net	14,091	12,644	27,817	28,025
Marketing and Advertising Expense	8,548	7,748	16,374	14,134
Equipment Expense	5,423	4,494	11,033	9,021
Professional Fees	17,454	6,674	24,176	12,757
Payments of Financing Costs	1,552	2,705	3,259	5,299
Federal Deposit Insurance Corporation Premium Expense	10,595	9,708	19,432	20,144
Amortization of Intangible Assets	6,894	2,203	9,096	4,405
Other Noninterest Expense	13,290	9,674	20,914	21,648
Noninterest Expense, Total	271,882	209,352	491,045	419,971
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	159,167	139,629	312,050	260,724
Income Tax Expense (Benefit)	35,603	28,399	68,850	47,808
Net Income (Loss) Attributable to Parent, Total	123,564	111,230	243,200	212,916
Preferred Stock Dividends and Other Adjustments	2,875	2,875	5,750	5,750
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ 120,689	$ 108,355	$ 237,450	$ 207,166
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.64	$ 0.65	$ 1.34	$ 1.25
Earnings Per Share, Diluted	$ 0.63	$ 0.65	$ 1.33	$ 1.24
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	188,084	164,936	176,654	165,081
Weighted Average Number of Shares Outstanding, Diluted	189,899	166,343	178,402	166,506
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	$ 26,217	$ 23,025	$ 51,435	$ 45,522
Deposit Account [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	15,863	13,147	29,916	25,961
Credit and Debit Card [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	14,161	11,200	25,740	21,642
Financial Service, Other [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	$ 5,758	$ 4,995	$ 10,623	$ 10,245