EARNINGS PER SHARE - Computation of earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 2,047	$ 2,434
Less: Undistributed earnings allocated to participating securities	(34)	(26)
Net income allocated to common stock	2,013	2,408
Weighted average common shares issued	2,828	2,806
Less: Unvested restricted stock awards	(40)	(29)
Weighted average common shares outstanding used to calculate basic earnings per common share	2,788	2,777
Add: Dilutive effect of stock options	9	12
Weighted average common shares outstanding used to calculate diluted earnings per common share	$ 2,797	$ 2,789
Earnings per common share (basic)	$ 0.72	$ 0.87
Earnings per common share (diluted)	$ 0.72	$ 0.86