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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassifications out of accumulated other comprehensive income, net of tax      
Interest expense $ (86,552) $ (53,992) $ (17,014)
Other-than-temporary impairment losses     (753)
Provision for income taxes (43,942) (45,384) (81,251)
Net income 186,483 178,871 87,554
Amount Reclassified from Accumulated Other Comprehensive Loss      
Reclassifications out of accumulated other comprehensive income, net of tax      
Net income 8,080 1,557 319
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 (349) 155 275
Provision for income taxes 77 (34) (105)
Net income (272) 121 170
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 2,655 655 (1,421)
Provision for income taxes (584) (145) 542
Net income 2,071 510 (879)
Noncredit Other-Than-Temporary Impairment Losses | Amount Reclassified from Accumulated Other Comprehensive Loss      
Reclassifications out of accumulated other comprehensive income, net of tax      
Other-than-temporary impairment losses     753
Provision for income taxes     (287)
Net income     466
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 8,053 1,187 908
Provision for income taxes (1,772) (261) (346)
Net income $ 6,281 $ 926 $ 562