Calculation of earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income	$ 3,018	$ 3,568
Less: Undistributed earnings allocated to participating securities	(50)	(60)
Net income allocated to common stock	2,968	3,508
Weighted-average common shares issued	5,799	5,734
Less: Unvested restricted stock awards	(97)	(98)
Weighted average common shares outstanding used to calculate basic earnings per common share	5,702	5,636
Add: Dilutive effect of stock options and restricted stock units	12	58
Weighted-average common shares outstanding used to calculate diluted earnings per common share	$ 5,714	$ 5,694
Earnings per common share (basic)	$ 0.52	$ 0.62
Earnings per common share (diluted)	$ 0.52	$ 0.62