Earnings per Share - Summary of earnings per share computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic
Net income	$ 2,533	$ 3,468	$ 5,130	$ 6,453
Weighted average common shares outstanding (in shares)	7,407,031	7,385,674	7,419,532	7,384,952
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.47	$ 0.69	$ 0.87
Diluted
Weighted average shares outstanding for basic earnings per share	7,407,031	7,385,674	7,419,532	7,384,952
Add: Dilutive effects of share based awards	158,205	392,647	251,593	374,575
Average shares and dilutive potential common shares	7,565,236	7,778,321	7,671,125	7,759,527
Diluted earnings per share (in dollars per share)	$ 0.33	$ 0.45	$ 0.67	$ 0.83
Stock options and restricted shares not considered in computing diluted earnings per share because they were anti-dilutive	293,250	42,500	293,250	129,500