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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Net gain on securities transactions                 $ 81 $ 72 $ 2,221
Income tax expense $ 12,346 $ 9,285 $ 3,715 $ 5,257 $ 8,026 $ 9,938 $ 8,802 $ 7,689 30,603 34,455 25,530
Net of tax $ (40,567) $ (27,143) $ (14,311) $ (14,931) $ (25,951) $ (31,399) $ (24,393) $ (30,890) (96,951) (112,633) (118,387)
Compensation and employee benefits                 130,868 116,849 111,496
Securities available for sale                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Net gain on securities transactions                 0 0 0
Income tax expense                 0 0 0
Net of tax                 0 0 0
Post-retirement obligations - Amortization of actuarial losses | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Income tax expense                 (115) (49) (109)
Net of tax                 333 140 290
Compensation and employee benefits                 $ 448 $ 189 $ 399