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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Current Federal income tax expense $ 3,720 $ 2,945 $ (125)
Current State income tax expense (benefit) 605 570 (37)
Total current income tax expense 4,325 3,515 (162)
Deferred Federal income tax expense (benefit) 1,100 (1,208) (397)
Deferred State income tax expense (benefit) 1,492 275 (11)
Total deferred income tax expense (benefit) 2,592 (933) (408)
Provision (benefit) from income taxes, Federal 4,820 1,737 (522)
Provision (benefit) from income taxes, State 2,097 845 (48)
Provision for income taxes $ 6,917 $ 2,582 $ (570)