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Income Taxes - Reconciliation of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of the provision for income taxes, with amounts determined by applying the statutory federal income tax rate to pre-tax income      
Income tax at statutory rate $ 77,977 $ 110,493 $ 112,032
Change in tax rate 0 10,095 0
Tax-exempt interest (1,305) (2,278) (2,270)
Unrecognized tax benefits 3,088 0 0
Other, net 3,336 386 (37)
Income tax expense $ 83,096 $ 118,696 $ 109,725