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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