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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

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