Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic
Net income	$ 5,077	$ 3,299
Undistributed earnings allocated to participating securities	(52)	(62)
Net income allocated to common shares	$ 5,025	$ 3,237
Weighted average common shares outstanding	15,022,876	15,486,549
Basic earnings per common share	$ 0.33	$ 0.21
Diluted
Net income allocated to common shares	$ 5,025	$ 3,237
Weighted average common shares outstanding	15,022,876	15,486,549
Add: Dilutive effects of assumed exercises of stock options	46,568	99,706
Average shares and dilutive potential common shares	15,069,444	15,586,255
Diluted earnings per common share	$ 0.33	$ 0.21