EARNINGS PER SHARE - Computation of earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 2,344	$ 1,694	$ 6,259	$ 5,180
Less: Undistributed earnings allocated to participating securities	(33)	(16)	(73)	(41)
Net income allocated to common stock	2,311	1,678	6,186	5,139
Weighted average common shares issued	2,804	2,785	2,795	2,777
Less: Unvested restricted stock awards	(40)	(26)	(33)	(22)
Weighted average common shares outstanding used to calculate basic earnings per common share	2,764	2,759	2,762	2,755
Add: Dilutive effect of stock options	15	20	18	19
Weighted average common shares outstanding used to calculate diluted earnings per common share	$ 2,779	$ 2,779	$ 2,780	$ 2,774
Earnings per common share (basic)	$ 0.84	$ 0.61	$ 2.24	$ 1.87
Earnings per common share (diluted)	$ 0.83	$ 0.60	$ 2.23	$ 1.85