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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Interest and Dividend Income, Operating [Abstract]      
Interest and Fee Income, Loans and Leases $ 467,602 $ 399,795 $ 323,107
Interest and Dividend Income, Securities, by Classification [Abstract]      
Interest Income, Securities, US Treasury and Other US Government 41,718 52,786 36,047
Interest Income, Securities, State and Municipal 5,524 10,966 10,964
Other Interest and Dividend Income 8,121 8,123 8,129
Interest and Dividend Income, Operating, Total 522,965 471,670 378,247
Interest Expense, Deposits [Abstract]      
Interest Expense, NOW Accounts, Money Market Accounts, and Savings Deposits 82,789 71,776 17,646
Interest Expense, Time Deposits 29,594 12,677 3,314
Interest Expense, Borrowings [Abstract]      
Interest Expense, Short-term Borrowings 3,135 4,721 1,395
Interest Expense, Long-term Debt 9,428 9,383 8,833
Total interest expense 124,946 98,557 31,188
Net interest income 398,019 373,113 347,059
Financing Receivable, Credit Loss, Expense (Reversal) 14,543 2,904 4,557
Interest Income (Expense), after Provision for Loan Loss, Total 383,476 370,209 342,502
Noninterest Income [Abstract]      
Debit card fee income 25,873 26,522 26,046
Bank Owned Life Insurance Income 7,770 5,338 6,100
ATM Fees 1,840 2,178 2,273
Gains (Losses) on Sales of Other Real Estate 42 (3) 5,611
Real Estate Owned, Valuation Allowance, Valuation Increase 30 60 12,039
Gain (Loss) on Sale of Investments (526) (7,875) 0
Gain on equity securities, net 3,080 971 2,955
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 9,263 7,572 12,108
Noninterest Income, Other 5,835 3,652 9,326
Total other income 122,588 92,634 135,935
Noninterest Expense [Abstract]      
Salaries 147,311 139,237 133,299
Employee benefits 41,724 42,264 40,490
Occupancy expense 12,816 13,114 13,866
Furniture and equipment expense 9,983 12,233 11,901
Data processing fees 40,564 37,637 32,627
Professional fees and services 31,146 29,173 30,837
Marketing 6,318 5,471 5,335
Insurance 6,735 7,640 5,413
Communication 4,097 4,210 3,891
State tax expense 4,500 4,657 4,585
Amortization of Intangible Assets 1,215 1,323 1,487
Foundation contribution expense 2,000 1,000 4,000
Miscellaneous 12,930 11,280 10,247
Total other expense 321,339 309,239 297,978
Income before income taxes 184,725 153,604 180,459
Income taxes 33,305 26,870 32,108
Net Income (Loss) Attributable to Parent $ 151,420 $ 126,734 $ 148,351
Earnings Per Share [Abstract]      
Basic (in dollars per share) $ 9.38 $ 7.84 $ 9.13
Diluted (in dollars per share) $ 9.32 $ 7.80 $ 9.06
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 6,148 $ 0 $ 0
Fiduciary and Trust [Member]      
Noninterest Income [Abstract]      
Revenue from Contract with Customer, Including Assessed Tax 42,489 35,474 34,091
Deposit Account [Member]      
Noninterest Income [Abstract]      
Revenue from Contract with Customer, Including Assessed Tax 9,001 8,445 10,091
Bank Servicing [Member]      
Noninterest Income [Abstract]      
Revenue from Contract with Customer, Including Assessed Tax 11,743 10,300 15,295
Noninterest Income, Other $ 11,700 $ 10,300 $ 15,300