PENSION PLAN, Plan's funded status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CHANGES IN BENEFIT OBLIGATIONS [Roll Forward]
Benefit obligation-beginning of year	$ 22,916	$ 23,341	$ 24,299
Service cost	29	28	28
Interest cost	840	888	884
Actuarial loss (gain)	721	(255)	(782)
Benefits paid	(1,014)	(1,086)	(1,088)
Benefit obligation at end of year	23,492	22,916	23,341
CHANGE IN PLAN ASSETS [Roll Forward]
Fair value of plan assets-beginning of year	17,548	17,792	19,000
Actual return on plan assets	2,521	842	(120)
Benefits paid	(1,014)	(1,086)	(1,088)
Fair value of plan assets-end of year	19,055	17,548	17,792
BENEFIT OBLIGATION IN EXCESS OF FAIR VALUE FUNDED STATUS:	$ (4,437)	$ (5,368)	$ (5,549)