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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income taxes:      
Federal $ 7,139 $ 6,429 $ 6,184
State 573 548 441
Total current tax expense 7,712 6,977 6,625
Deferred income tax expense (benefit) 2,904 356 (1,256)
Income tax expense $ 10,616 $ 7,333 $ 5,369