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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

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