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Earnings Per Share - Basic (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic Earnings Per share        
Net income $ 5,752 $ 4,494 $ 16,008 $ 13,691
Weighted average shares outstanding (in shares) 13,715,141 12,208,313 13,692,657 12,183,363
Basic earnings per share (in dollars per share) $ 0.42 $ 0.37 $ 1.17 $ 1.12