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Earnings per share - Basic and Diluted (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 4,323,960	$ 1,684,869	$ 11,670,286	$ 4,782,007
Weighted average common shares outstanding (in shares)	12,718,861	8,234,783	12,049,151	7,994,661
Effect of dilutive stock options (in shares)	98,695	85,991	94,687	79,185
Diluted shares (in shares)	12,817,556	8,320,774	12,143,838	8,073,846
Basic earnings per common share (in dollars per share)	$ 0.34	$ 0.20	$ 0.97	$ 0.60
Diluted earnings per common share (in dollars per share)	$ 0.34	$ 0.20	$ 0.96	$ 0.59

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