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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net gain on securities transactions $ 30,592 $ 25,715 $ 67,490 $ 76,549
Tax (expense) benefit (6,330) (5,478) (13,779) (15,816)
Other operating expense (10,289) (11,298) (34,826) (35,451)
Net of tax 24,230 20,206 53,610 60,638
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 0 133 429 404
Tax (expense) benefit 0 (32) (105) (99)
Net of tax 0 101 324 305
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 (593) (411) (1,775) (1,232)
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 (53) (4) (160) (11)
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 (646) (415) (1,935) (1,243)
Tax (expense) benefit 159 102 474 305
Net of tax $ (487) $ (313) $ (1,461) $ (938)