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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component In Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain (loss) on securities transactions $ 11 $ 85 $ 26 $ 65
Income tax expense (benefit) (7,432) (5,858) (20,321) (15,958)
Other operating expense (15,098) (12,989) (41,019) (39,329)
Total before tax 31,105 24,527 85,144 67,243
Net of tax 23,673 18,638 64,823 51,192
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for- Sale Debt Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain (loss) on securities transactions 0 50 0 50
Income tax expense (benefit) 0 (12) 0 (12)
Net of tax 0 38 0 38
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 (95) (229) (285) (686)
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) (45) (147) (137)
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 (benefit) 37 66 109 201
Total before tax (144) (274) (432) (823)
Net of tax $ (107) $ (208) $ (323) $ (622)