INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 2,635	$ 4,885	$ 2,830
State	771	1,197	591
Total current	3,406	6,082	3,421
Deferred expense (benefit)
Federal	1,268	665	(371)
State	81	42	(24)
Total deferred expense (benefit)	1,349	707	(395)
Income tax expense (benefit)	$ 4,755	$ 6,789	$ 3,026