NET DEFERRED TAX ASSET AND INCOME TAXES - Components of income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred expense (benefit)	$ 888	$ 957	$ 945
Income tax provision	2,914	2,589	3,563
Components of income tax provision
Federal	1,831	1,344	2,186
State	195	288	432
Current provision	2,026	1,632	2,618
Federal	840	852	896
State	48	105	49
Deferred expense (benefit)	888	957	945
Income tax provision	$ 2,914	$ 2,589	$ 3,563