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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain (loss) on securities transactions $ 85 $ (62,967) $ 65 $ (70,019)
Income tax expense (benefit) (5,858) 8,304 (15,958) 619
Other operating expense (12,989) (13,466) (39,329) (41,403)
Total before tax 24,527 (41,627) 67,243 (6,024)
Net of tax 18,638 (33,354) 51,192 (5,498)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain (loss) on securities transactions 50 (62,932) 50 (69,984)
Income tax expense (benefit) (12) 15,419 (12) 17,146
Net of tax 38 (47,513) 38 (52,838)
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 (229) (279) (686) (837)
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 (45) (53) (137) (162)
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) 66 81 201 245
Total before tax (274) (332) (823) (999)
Net of tax $ (208) $ (251) $ (622) $ (754)