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Accumulated Other Comprehensive Income (Loss) - Reclassifications (Loss) (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 Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains on sales of available for sale securities |  |  |  |  |  |  |  |  | $ 11,895 | $ 4,415 | $ 4,269
Income tax expense | $ (7,641) | $ (5,621) | $ (4,623) | $ (3,490) | $ (8,298) | $ (6,337) | $ (7,749) | $ (6,941) | (21,375) | (29,325) | (28,999)
Subordinated debentures and term loans |  |  |  |  |  |  |  |  | 6,944 | 8,309 | 8,233
Salaries and employee benefits |  |  |  |  |  |  |  |  | 155,937 | 144,037 | 131,704
Total reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | 8,615 | 3,140 | 3,018
Unrealized gains (losses) on available for sale securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | 9,397 | 3,488 | 3,373
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | (716) | (264) | (371)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on available for sale securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains on sales of available for sale securities |  |  |  |  |  |  |  |  | 11,895 | 4,415 | 4,269
Income tax expense |  |  |  |  |  |  |  |  | (2,498) | (927) | (896)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | 190 | 70 | 99
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on cash flow hedges | Interest rate contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subordinated debentures and term loans |  |  |  |  |  |  |  |  | (906) | (334) | (470)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on defined benefit plans |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | 18 | 22 | (4)
Salaries and employee benefits |  |  |  |  |  |  |  |  | (84) | (106) | 20
Total reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | $ (66) | $ (84) | $ 16

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