Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic
Net income	$ 2,416	$ 3,299	$ 3,836	$ 4,740	$ 5,715	$ 8,576
Undistributed earnings allocated to participating securities	(45)		(101)		(106)	(228)
Net income allocated to common shares	$ 2,371		$ 3,735		$ 5,609	$ 8,348
Weighted average common shares outstanding	15,072,423		15,685,478		15,279,486	15,750,905
Basic earnings per common share	$ 0.16		$ 0.24		$ 0.37	$ 0.53
Diluted
Net income allocated to common shares	$ 2,371		$ 3,735		$ 5,609	$ 8,348
Weighted average common shares outstanding	15,072,423		15,685,478		15,279,486	15,750,905
Add: Dilutive effects of assumed exercises of stock options	40,195		266,120		54,801	255,594
Average shares and dilutive potential common shares	15,112,618		15,951,598		15,334,287	16,006,499
Diluted earnings per common share	$ 0.16		$ 0.23		$ 0.37	$ 0.52