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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:                      
Federal                 $ 2,761 $ 3,578 $ 3,619
State                 385 489 496
Total current                 3,146 4,067 4,115
Deferred:                      
Federal                 3,189 (267) 391
State                 1,567 (50) 74
Total deferred                 4,756 (317) 465
Total income tax expense $ 4,979 $ 847 $ 983 $ 1,093 $ 1,052 $ 1,003 $ 730 $ 965 $ 7,902 $ 3,750 $ 4,580