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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassifications out of accumulated other comprehensive income, net of tax |  |  |
Interest expense | $ (83,564) | $ (86,552) | $ (53,992)
Other-than-temporary impairment losses | 0 |  | 991
Provision for income taxes | 16,660 | (43,942) | (45,384)
Net income | 120,632 | 186,483 | 178,871
Amount Reclassified from Accumulated Other Comprehensive Loss |  |  |
Reclassifications out of accumulated other comprehensive income, net of tax |  |  |
Net income | 36,974 | 8,080 | 1,557
Gains and Losses on Cash Flow Hedges | Amount Reclassified from Accumulated Other Comprehensive Loss | Interest rate contracts |  |  |
Reclassifications out of accumulated other comprehensive income, net of tax |  |  |
Interest expense | 47,303 | (349) | 155
Provision for income taxes | (10,407) | 77 | (34)
Net income | 36,896 | (272) | 121
Unrealized Gains and Losses on Securities Available for Sale | Amount Reclassified from Accumulated Other Comprehensive Loss |  |  |
Reclassifications out of accumulated other comprehensive income, net of tax |  |  |
Securities (gains) losses, net | (50) | 2,655 | 655
Provision for income taxes | 11 | (584) | (145)
Net income | (39) | 2,071 | 510
Benefit Plans | Amount Reclassified from Accumulated Other Comprehensive Loss |  |  |
Reclassifications out of accumulated other comprehensive income, net of tax |  |  |
Salaries and employee benefits /Pension Plan Termination Expense | 152 | 8,053 | 1,187
Provision for income taxes | (35) | (1,772) | (261)
Net income | $ 117 | $ 6,281 | $ 926

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