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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net (loss) gain on securities transactions $ (60) $ (2) $ 257 $ 446
Other operating expense (14,164) (10,706) (35,519) (33,553)
Total before tax 28,004 30,592 89,676 67,490
Tax (expense) benefit (6,630) (6,330) (19,781) (13,779)
Net of tax 21,342 24,230 69,799 53,610
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 (loss) gain on securities transactions (54) 0 275  
Total before tax       429
Tax (expense) benefit 13 0 (67) (105)
Net of tax (41) 0 208 324
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 (738) (593) (2,213) (1,775)
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 (56) (53) (167) (160)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Total before tax (794) (646) (2,380) (1,935)
Tax (expense) benefit 195 159 583 474
Net of tax $ (599) $ (487) $ (1,797) $ (1,461)