Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest and Dividend Income, Operating [Abstract]
Interest and Fee Income, Loans and Leases	$ 455,623	$ 465,728	$ 1,336,703	$ 1,376,988
Interest and Dividend Income, Securities, by Taxable Status [Abstract]
Interest Income, Securities, Operating, Taxable	73,727	51,229	214,689	148,055
Interest Income, Securities, Operating, Tax Exempt	13,888	14,660	41,746	44,103
Other Interest and Dividend Income	13,353	8,701	35,274	24,834
Interest and Dividend Income, Operating, Total	556,591	540,318	1,628,412	1,593,980
Interest Expense, Operating and Nonoperating [Abstract]
Interest Expense, Deposits	202,344	231,623	609,139	678,916
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase	2,107	3,385	7,733	8,551
Interest Expense, Other Short-Term Borrowings	212	6,144	907	16,929
Interest on FHLB Funding	35,965	24,799	86,944	80,612
Interest Expense, Long-Term Debt	10,741	11,858	32,526	32,012
Interest Expense, Operating and Nonoperating, Total	251,369	277,809	737,250	817,021
Interest Income (Expense), Operating, Total	305,222	262,509	891,163	776,960
Provision for Loan, Lease, and Other Losses	16,000	20,991	46,999	68,000
Interest Income (Expense), after Provision for Loan Loss, Total	289,223	241,518	844,164	708,960
Noninterest Income [Abstract]
Capital Market Fees Net	10,764	4,317	20,873	13,052
Fees and Commissions, Mortgage Banking and Servicing	3,541	2,132	11,577	7,299
Gain (Loss) on Sale of Mortgage Loans	0	0	(6,976)	0
Bank Owned Life Insurance Income	4,051	4,001	13,391	11,156
Gain (Loss) on Disposition of Assets	3,340	(474)	727	(1,407)
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	1	100	13	4,047
Noninterest Income, Other Operating Income	2,670	2,504	7,147	7,054
Noninterest Income, Total	81,265	67,221	207,019	197,365
Noninterest Expense [Abstract]
Labor and Related Expense	135,703	121,036	386,593	362,012
Information Technology and Data Processing	28,590	27,217	82,237	80,579
Occupancy, Net	12,757	13,536	40,782	40,297
Marketing and Advertising Expense	8,362	6,683	22,496	20,735
Equipment Expense	4,368	4,653	13,389	13,702
Professional Fees	5,232	5,639	17,989	14,740
Payments of Financing Costs	1,638	2,748	6,937	6,519
Federal Deposit Insurance Corporation Premium Expense	9,980	8,223	30,124	29,300
Amortization of Intangible Assets	2,203	2,203	6,608	6,608
Other Noninterest Expense	7,369	8,659	29,017	19,622
Noninterest Expense, Total	216,202	200,597	636,173	594,115
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	154,286	108,142	415,010	312,211
Income Tax Expense (Benefit)	29,554	20,124	77,362	27,451
Net Income (Loss) Attributable to Parent, Total	124,732	88,018	337,648	284,760
Preferred Stock Dividends and Other Adjustments	2,875	2,875	8,625	8,625
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ 121,857	$ 85,143	$ 329,023	$ 276,135
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.73	$ 0.56	$ 1.98	$ 1.83
Earnings Per Share, Diluted	$ 0.73	$ 0.56	$ 1.96	$ 1.82
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	165,029	150,247	165,064	149,993
Weighted Average Number of Shares Outstanding, Diluted	166,703	151,492	166,645	151,244
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	$ 25,315	$ 24,144	$ 70,837	$ 68,466
Deposit Account [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	13,861	13,708	39,822	38,410
Credit and Debit Card [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	12,308	11,731	33,950	34,973
Financial Service, Other [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	$ 5,414	$ 5,057	$ 15,659	$ 14,316