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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income taxes:      
Federal $ 5,536 $ 7,139 $ 6,429
State 990 573 548
Total current tax expense 6,526 7,712 6,977
Deferred income tax expense (benefit) (125) 2,904 356
Income tax expense $ 6,401 $ 10,616 $ 7,333