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Earnings Per Share - Basic (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic Earnings Per share        
Net income $ 4,965 $ 4,948 $ 10,256 $ 9,198
Weighted average shares outstanding (in shares) 13,692,358 12,207,570 13,681,229 12,187,324
Basic earnings per share (in dollars per share) $ 0.36 $ 0.41 $ 0.75 $ 0.75