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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain (loss) on securities transactions $ (5) $ 14
Income tax expense (8,393) (6,121)
Other operating expense (13,489) (13,173)
Total before tax 34,467 25,800
Net Income 26,074 19,679
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Unrealized gains and losses on available-for-sale debt securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain (loss) on securities transactions 0 0
Income tax expense 0 0
Net Income 0 0
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial loss    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other operating expense (109) (171)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan prior service cost    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other operating expense (49) (49)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee Benefit Plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Income tax expense 40 55
Total before tax (158) (220)
Net Income $ (118) $ (165)