EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of net periodic benefit cost [Abstract]
Service cost with interest to end of year	$ 67	$ 66	$ 54
Interest cost	46	48	36
Amortization of prior service credit/(cost	74	57	(18)
Amortization of (gain)/loss	(15)	(10)	0
Total net periodic benefit cost	$ 172	$ 161	$ 72