EMPLOYEE BENEFIT PLANS (Components of net periodic benefit cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits
Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	24	26	47	52
Expected return on plan assets	(35)	(37)	(69)	(72)
Recognized net actuarial (gain) loss	48	47	96	93
Net pension expense (benefit)	37	36	74	73
SERP Benefits
Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Service cost	0	0	0	0
Interest cost	8	10	17	20
Expected return on plan assets	(16)	(15)	(31)	(31)
Recognized net actuarial (gain) loss	19	20	37	40
Net pension expense (benefit)	$ 11	$ 15	$ 23	$ 29