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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