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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions $ 29,333 $ 27,003 $ 61,672 $ 36,898
Tax (expense) benefit (6,471) (5,540) (13,151) (7,449)
Other operating expense (10,730) (11,437) (21,355) (22,847)
Net of tax 22,831 21,431 48,457 29,380
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 on securities transactions 0 0 330 429
Tax (expense) benefit 0 0 (81) (105)
Net of tax 0 0 249 324
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 (711) (581) (1,475) (1,183)
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) (54) (111) (107)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions (767) (635) (1,586) (1,290)
Tax (expense) benefit 188 155 388 316
Net of tax $ (579) $ (480) $ (1,198) $ (974)