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Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current tax provision |  |  |  |
Federal |  | $ 5,379 | $ 9,710 | $ 7,097
State |  | 2,623 | 3,794 | 2,931
Total current |  | 8,002 | 13,504 | 10,028
Deferred tax provision (benefit) |  |  |  |
Federal |  | 4,444 | (206) | 382
State |  | 416 | 48 | 80
Total deferred |  | 4,860 | (158) | 462
Total income tax provision |  | 12,862 | $ 13,346 | $ 10,490
Write-down to net deferred tax assets recorded as income tax expense | $ 3,000 | $ 3,000 |  |

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