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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

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