EMPLOYEE BENEFIT PLANS (Components of periodic benefit cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Service cost	$ 0	$ 0
Interest cost	22	23
Expected return on plan assets	(34)	(34)
Recognized net actuarial (gain) loss	32	48
Net pension expense (benefit)	20	37
SERP Benefits
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Service cost	0	0
Interest cost	9	9
Expected return on plan assets	(13)	(15)
Recognized net actuarial (gain) loss	18	18
Net pension expense (benefit)	$ 14	$ 12