PENSION AND OTHER POSTRETIREMENT PLANS (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net pension expense:
Net (gain)/loss	$ (97)	$ 151	$ 325
Pension Plans, Defined Benefit [Member]
Net pension expense:
Service cost	0	0	0
Interest cost	104	105	103
Expected return on plan assets	(143)	(139)	(139)
Recognized net actuarial loss	185	135	162
Settlement cost	0	128	78
Net pension expense	146	229	204
Net (gain)/loss	(36)	122	203
Amortization of net loss	(185)	(135)	(162)
Total recognized in other comprehensive income	(221)	(13)	41
Total recognized in net pension expense and other comprehensive income	(75)	216	245
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net pension expense:
Service cost	0	0	0
Interest cost	40	45	46
Expected return on plan assets	(63)	(70)	(76)
Recognized net actuarial loss	80	80	82
Settlement cost	0	0	0
Net pension expense	57	55	52
Net (gain)/loss	(61)	29	122
Amortization of net loss	(80)	(80)	(82)
Total recognized in other comprehensive income	(141)	(51)	40
Total recognized in net pension expense and other comprehensive income	$ (84)	$ 4	$ 92