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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                              
Current federal income tax expense                         $ 59,019 $ 53,290 $ 46,758
Current state income tax expense                         7,511 13,733 11,020
Total current tax expense                         66,530 67,023 57,778
Deferred federal income tax expense (benefit)                         18,459 (5,523) (6,642)
Deferred state income tax expense (benefit)                         515 (105) (87)
Total deferred expense (benefit)                         18,974 (5,628) (6,729)
Total income tax expense $ 35,396 $ 17,409 $ 17,382 $ 15,318 $ 16,429 $ 15,484 $ 15,069 $ 14,413 $ 13,485 $ 13,054 $ 12,776 $ 11,734 $ 85,504 $ 61,395 $ 51,049