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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain (loss) on securities transactions $ 1 $ (6) $ 15 $ (20)
Income tax expense (benefit) (6,768) (4,902) (12,889) (10,100)
Other operating expense (12,832) (13,349) (25,921) (26,340)
Total before tax 28,239 20,615 54,039 42,716
Net of tax 21,471 15,682 41,150 32,554
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 0 0 0
Income tax expense (benefit) 0 0 0 0
Net of tax 0 0 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 (19) (215) (190) (457)
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) (47) (98) (92)
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) 17 65 72 135
Total before tax (68) (262) (288) (549)
Net of tax $ (51) $ (197) $ (216) $ (414)