PENSION PLAN, Plan's funded status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CHANGES IN BENEFIT OBLIGATIONS [Roll Forward]
Benefit obligation-beginning of year	$ 21,105	$ 23,492	$ 22,916
Service cost	33	28	29
Interest cost	812	755	840
Actuarial loss (gain)	2,103	(1,951)	721
Benefits paid	(1,221)	(1,219)	(1,014)
Benefit obligation at end of year	22,832	21,105	23,492
CHANGE IN PLAN ASSETS [Roll Forward]
Fair value of plan assets-beginning of year	16,835	19,055	17,548
Actual return on plan assets	3,203	(1,000)	2,521
Benefits paid	(1,221)	(1,220)	(1,014)
Fair value of plan assets-end of year	18,817	16,835	19,055
BENEFIT OBLIGATION IN EXCESS OF FAIR VALUE FUNDED STATUS:	$ (4,015)	$ (4,270)	$ (4,437)