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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
Net income $ 13,045 $ 13,036 $ 10,167
Net income available to common shareholders $ 13,045 $ 13,036 $ 10,167
Denominator:      
Weighted-average common shares outstanding - basic 7,005,703 6,318,322 6,204,518
Common stock equivalents 387,674 402,566 356,221
Weighted-average common shares outstanding - diluted 7,393,377 6,720,888 6,560,739
Earnings per common share:      
Basic $ 1.86 $ 2.06 $ 1.64
Diluted $ 1.76 $ 1.94 $ 1.55