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Consolidated Statements of Income - USD ($)
$ 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 $ 754,459 $ 754,930 $ 687,852
Interest and Dividend Income, Securities, by Taxable Status [Abstract]      
Interest Income, Securities, Operating, Taxable 81,644 51,352 39,510
Interest Income, Securities, Operating, Tax Exempt 32,651 24,036 22,717
Interest Income, Domestic Deposits 17,566 18,918 13,430
Dividend Income, Operating 2,090 1,815 1,410
Interest and Dividend Income, Operating, Total 888,410 851,051 764,919
Interest Expense, Operating and Nonoperating [Abstract]      
Interest Expense, Deposits 241,098 264,608 183,723
Interest Expense, Subordinated Notes and Debentures 9,543 10,497 9,781
Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-Term 3,422 1,691 2,752
Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase 7,609 6,159 6,071
Interest Expense, Total 261,672 282,955 202,327
Interest Income (Expense), Net, Total 626,738 568,096 562,592
Provision for loan losses not covered under FDIC loss share 26,337 21,508 36,605
Interest Income (Expense), after Provision for Loan Loss, Total 600,401 546,588 525,987
Noninterest Income [Abstract]      
Noninterest Income 113,123 69,703 68,725
Noninterest Expense [Abstract]      
Labor and Related Expense 198,666 182,713 164,566
Deposit Costs 103,231 88,645 72,293
Occupancy, Net 20,154 17,231 16,526
Information Technology and Data Processing 20,239 19,671 15,196
Professional Fees 9,605 6,257 5,719
Other Noninterest Expense 77,912 70,530 73,886
Noninterest Expense, Total 429,807 385,047 348,186
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 283,717 231,244 246,526
Income Tax Expense (Benefit) 82,343 45,978 52,467
Net Income (Loss) Attributable to Parent, Total 201,374 185,266 194,059
Preferred Stock Dividends and Other Adjustments 3,750 3,750 3,750
Net Income (Loss) Available to Common Stockholders, Basic, Total $ 197,624 $ 181,516 $ 190,309
Earnings per common share:      
Basic (usd per share) $ 5.34 $ 4.86 $ 5.09
Diluted (usd per share) $ 5.31 $ 4.83 $ 5.07
Deposit Account [Member]      
Noninterest Income [Abstract]      
Noninterest Income $ 19,376 $ 18,344 $ 16,559
Fiduciary and Trust [Member]      
Noninterest Income [Abstract]      
Noninterest Income 10,456 10,452 10,030
Card Services Revenue [Member]      
Noninterest Income [Abstract]      
Noninterest Income 9,995 9,966 10,028
Tax credit activity, net [Member]      
Noninterest Income [Abstract]      
Noninterest Income 7,697 8,954 9,196
Financial Service, Other [Member]      
Noninterest Income [Abstract]      
Noninterest Income $ 65,599 $ 21,987 $ 22,912