Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest and Dividend Income, Operating [Abstract]
Interest and Fee Income, Loans and Leases	$ 465,728	$ 447,912	$ 1,376,988	$ 1,262,538
Interest and Dividend Income, Securities, by Taxable Status [Abstract]
Interest Income, Securities, Operating, Taxable	51,229	38,210	148,055	104,197
Interest Income, Securities, Operating, Tax Exempt	14,660	15,941	44,103	47,960
Other Interest and Dividend Income	8,701	6,575	24,834	17,990
Interest and Dividend Income, Operating, Total	540,318	508,637	1,593,980	1,432,685
Interest Expense, Operating and Nonoperating [Abstract]
Interest Expense, Deposits	231,623	193,131	678,916	464,749
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase	3,385	3,100	8,551	8,504
Interest Expense, Other Short-Term Borrowings	6,144	0	16,929	1
Interest on FHLB Funding	24,799	48,143	80,612	147,365
Interest Expense, Long-Term Debt	11,858	10,019	32,012	25,895
Interest Expense, Operating and Nonoperating, Total	277,809	254,394	817,021	646,514
Interest Income (Expense), Operating, Total	262,509	254,244	776,960	786,171
Provision for Loan, Lease, and Other Losses	20,991	21,943	68,000	62,014
Interest Income (Expense), after Provision for Loan Loss, Total	241,518	232,301	708,960	724,157
Noninterest Income [Abstract]
Capital Market Fees Net	4,317	5,368	13,052	15,544
Fees and Commissions, Mortgage Banking and Servicing	2,132	6,501	7,299	17,814
Bank Owned Life Insurance Income	4,001	2,047	11,156	6,882
Gain (Loss) on Disposition of Assets	(474)	625	(1,407)	590
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	100	(11)	4,047	55
Noninterest Income, Other Operating Income	2,504	2,339	7,054	6,841
Noninterest Income, Total	67,221	66,579	197,365	194,195
Noninterest Expense [Abstract]
Labor and Related Expense	121,036	117,159	362,012	347,669
Information Technology and Data Processing	27,217	26,172	80,579	73,990
Occupancy, Net	13,536	14,125	40,297	42,775
Marketing and Advertising Expense	6,683	7,100	20,735	20,054
Equipment Expense	4,653	5,016	13,702	14,921
Professional Fees	5,639	4,461	14,740	13,149
Payments of Financing Costs	2,748	2,049	6,519	4,822
Federal Deposit Insurance Corporation Premium Expense	8,223	9,150	29,300	25,575
Amortization of Intangible Assets	2,203	2,203	6,608	6,608
Other Noninterest Expense	8,659	8,771	19,622	24,726
Noninterest Expense, Total	200,597	196,205	594,115	574,291
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total	108,142	102,674	312,211	344,061
Income Tax Expense (Benefit)	20,124	19,426	27,451	70,299
Net Income (Loss) Attributable to Parent, Total	88,018	83,248	284,760	273,762
Preferred Stock Dividends and Other Adjustments	2,875	2,875	8,625	8,625
Net Income (Loss) Available to Common Stockholders, Basic, Total	$ 85,143	$ 80,373	$ 276,135	$ 265,137
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.56	$ 0.53	$ 1.83	$ 1.76
Earnings Per Share, Diluted	$ 0.56	$ 0.53	$ 1.82	$ 1.75
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	150,247	150,035	149,993	149,929
Weighted Average Number of Shares Outstanding, Diluted	151,492	151,014	151,244	150,971
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	$ 24,144	$ 20,828	$ 68,466	$ 61,499
Deposit Account [Member]
Noninterest Income [Abstract]
Noninterest Income In Scope of Topic 606	13,708	12,864	38,410	38,230
Credit and Debit Card [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	11,731	11,510	34,973	33,492
Financial Service, Other [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax, Out of Scope Topic 606	$ 5,057	$ 4,509	$ 14,316	$ 13,249