Earnings per Share - Summary of earnings per share computation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic
Net income	$ 14,143	$ 8,734	$ 3,644
Less: Earnings allocated to preferred stock			23
Net income allocated to common shareholders	$ 14,143	$ 8,734	$ 3,621
Weighted average common shares outstanding	7,388,702	7,374,013	6,163,549
Basic earnings per common share	$ 1.91	$ 1.18	$ 0.59
Diluted
Net income	$ 14,143	$ 8,734	$ 3,621
Weighted average shares outstanding for basic earnings per common share	7,388,702	7,374,013	6,163,549
Add: Dilutive effects of share based awards	396,034	359,359	68,695
Average shares and dilutive potential common shares	7,784,736	7,733,372	6,232,244
Diluted earnings per common share	$ 1.82	$ 1.13	$ 0.58