Earnings Per Common Share (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
Numerator:
Net income available to common shareholders	$ 5,782	$ 4,250	$ 16,506	$ 10,965
Denominator:
Weighted-average common shares outstanding - basic	7,400,174	7,281,594	7,369,473	6,905,017
Common stock equivalents	346,031	386,882	372,010	386,147
Weighted-average common shares outstanding - diluted	7,746,205	7,668,476	7,741,483	7,291,164
Earnings per common share:
Basic	$ 0.78	$ 0.58	$ 2.24	$ 1.59
Diluted	$ 0.75	$ 0.55	$ 2.13	$ 1.50