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Accumulated Other Comprehensive Income (Loss) - Reclassifications (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains on sales of available for sale securities |  |  |  |  |  |  |  |  | $ 4,415 | $ 4,269 | $ 2,631
Income tax expense | $ (8,298) | $ (6,337) | $ (7,749) | $ (6,941) | $ (5,949) | $ (8,478) | $ (7,961) | $ (6,611) | (29,325) | (28,999) | (37,524)
Subordinated debentures and term loans |  |  |  |  |  |  |  |  | 8,309 | 8,233 | 7,572
Salaries and employee benefits |  |  |  |  |  |  |  |  | 144,037 | 131,704 | 119,812
Total reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | 3,140 | 3,018 | 1,667
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 |  |  |  |  |  |  |  |  | 3,488 | 3,373 | 1,710
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 |  |  |  |  |  |  |  |  | (264) | (371) |
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 |  |  |  |  |  |  |  |  |  |  | (640)
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 |  |  |  |  |  |  |  |  | 4,415 | 4,269 | 2,631
Income tax expense |  |  |  |  |  |  |  |  | (927) | (896) | (921)
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 |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | (334) | (470) |
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 |  |  |  |  |  |  |  |  |  |  | 345
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 |  |  |  |  |  |  |  |  |  |  | (985)
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 |  |  |  |  |  |  |  |  | 22 | (4) | (209)
Salaries and employee benefits |  |  |  |  |  |  |  |  | (106) | 20 | 806
Total reclassifications for the period, net of tax |  |  |  |  |  |  |  |  | $ (84) | $ 16 | $ 597

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