Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic
Net income	$ 8,250	$ 3,595	$ 19,706	$ 9,310
Undistributed earnings allocated to participating securities	(109)	(44)	(216)	(154)
Net income allocated to common shares	$ 8,141	$ 3,551	$ 19,490	$ 9,156
Weighted average common shares outstanding (shares)	15,133,407	15,148,833	15,071,327	15,235,617
Basic earnings per common share (in dollars per share)	$ 0.54	$ 0.23	$ 1.29	$ 0.60
Diluted
Net income allocated to common shares	$ 8,141	$ 3,551	$ 19,490	$ 9,156
Weighted average common shares outstanding for basic earnings per common share (shares)	15,133,407	15,148,833	15,071,327	15,235,617
Add: Dilutive effects of assumed exercises of stock options	67,206	33,900	62,246	48,573
Average shares and dilutive potential common shares (shares)	15,200,613	15,182,733	15,133,573	15,284,190
Diluted earnings per common share (in dollars per share)	$ 0.54	$ 0.23	$ 1.29	$ 0.60