EARNINGS PER SHARE - Computation of earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 1,694	$ 1,919	$ 5,180	$ 5,165
Less: Undistributed earnings allocated to participating securities	(16)	(15)	(41)	(41)
Net income allocated to common stock	1,678	1,904	5,139	5,124
Weighted average common shares issued	2,785	2,758	2,777	2,754
Less: Unvested restricted stock awards	(26)	(21)	(22)	(22)
Weighted average common shares outstanding used to calculate basic earnings per common share	2,759	2,737	2,755	2,732
Add: Dilutive effect of stock options	20	14	19	15
Weighted average common shares outstanding used to calculate diluted earnings per common share	$ 2,779	$ 2,751	$ 2,774	$ 2,747
Earnings per common share (basic)	$ 0.61	$ 0.70	$ 1.87	$ 1.88
Earnings per common share (diluted)	$ 0.60	$ 0.69	$ 1.85	$ 1.87