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Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net Gain (Loss) on Securities $ 40 $ 562 $ 2,247
Income Tax Expense (17,759) (17,351) (18,648)
Net Income 85,888 81,825 84,137
Salaries and Employee Benefits (83,244) (84,145) (68,570)
Total Reclassifications for the Period 32 390  
Unrealized Gains and Losses on Available-for-Sale Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total Reclassifications for the Period 32 444  
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total Reclassifications for the Period 32 444 1,775
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for-Sale Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net Gain (Loss) on Securities 40 562 2,247
Income Tax Expense (8) (118) (472)
Net Income 32 444 1,775
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Post Retirement Plan Items Actuarial Gains (Losses) | Postretirement Medical and Life Benefit Plan      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income Tax Expense 0 0 0
Net Income 0 0 0
Salaries and Employee Benefits $ 0 $ 0 $ 0