EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Employee Retirement Plan [Member]
Net periodic pension cost
Service cost	$ 112	$ 84
Interest cost	122	112
Recognized net actuarial loss	140	62
Net period benefit cost	374	258
Other Postretirement Benefit Plan
Net periodic pension cost
Service cost	12	13
Interest cost	33	36
Recognized net actuarial loss	13	10
Recognized prior service cost	(6)	(6)
Net period benefit cost	$ 52	$ 53