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Earnings per share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 9,121	$ 3,932	$ 13,852	$ 7,346
Weighted average basic common shares outstanding (in shares)	13,951,643	12,201,185	13,946,856	11,708,746
Effect of dilutive stock options (in shares)	94,857	119,313	89,934	113,751
Weighted average dilutive shares outstanding (in shares)	14,046,500	12,320,498	14,036,790	11,822,497
Basic earnings per common share (in dollars per share)	$ 0.65	$ 0.32	$ 0.99	$ 0.63
Diluted earnings per common share (in dollars per share)	$ 0.65	$ 0.32	$ 0.99	$ 0.62

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