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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                              
Current federal income tax expense                         $ 39,498 $ 59,019 $ 53,290
Current state income tax expense                         15,931 7,511 13,733
Total current tax expense                         55,429 66,530 67,023
Deferred federal income tax expense (benefit)                         (2,634) 18,459 (5,523)
Deferred state income tax expense (benefit)                         (863) 515 (105)
Total deferred expense (benefit)                         (3,497) 18,974 (5,628)
Total income tax expense $ 13,197 $ 13,928 $ 12,528 $ 12,279 $ 35,396 $ 17,409 $ 17,382 $ 15,318 $ 16,429 $ 15,484 $ 15,069 $ 14,413 $ 51,932 $ 85,504 $ 61,395