EARNINGS PER SHARE - Computation of earnings per share (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
Earnings Per Share [Abstract]
Net income	$ 2,734	$ 2,703	$ 4,781	$ 5,137
Less: Undistributed earnings allocated to participating securities	(43)	(32)	(77)	(58)
Net income allocated to common stock	2,691	2,671	4,704	5,079
Weighted average common shares issued	2,834	2,813	2,831	2,810
Less: Unvested restricted stock awards	(38)	(33)	(38)	(31)
Weighted average common shares outstanding used to calculate basic earnings per common share	2,796	2,780	2,793	2,779
Add: Dilutive effect of stock options	7	20	8	16
Weighted average common shares outstanding used to calculate diluted earnings per common share	$ 2,803	$ 2,800	$ 2,801	$ 2,795
Earnings per common share (basic)	$ 0.96	$ 0.96	$ 1.68	$ 1.83
Earnings per common share (diluted)	$ 0.96	$ 0.95	$ 1.68	$ 1.82