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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Current Federal income tax expense $ 1,188 $ 3,720 $ 2,945
Current State income tax expense (benefit) 1,224 605 570
Total current income tax expense 2,412 4,325 3,515
Deferred Federal income tax expense (benefit) 3,328 1,100 (1,208)
Deferred State income tax expense (benefit) 518 1,492 275
Total deferred income tax expense (benefit) 3,846 2,592 (933)
Remeasurement resulting from Tax Act, Federal 3,535    
Remeasurement resulting from Tax Act, State 0    
Remeasurement resulting from Tax Act 3,535    
Provision (benefit) from income taxes, Federal 8,051 4,820 1,737
Provision (benefit) from income taxes, State 1,742 2,097 845
Provision for income taxes $ 9,793 $ 6,917 $ 2,582