EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Funded Status of Defined Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Benefit obligation at beginning of year	$ 946	$ 1,128
Service cost	0	0	$ 0
Interest cost	31	22	20
Plan participants' contributions	0	0
Actuarial loss (gain)	63	(199)
Benefits paid	(5)	(5)
Settlement of plan obligation	(139)	0
Benefit obligation at end of year	896	946	1,128
Fair value of plan assets at beginning of year	1,001	1,175
Actual return on plan assets	89	(169)
Employer contribution	0	0
Plan participants' contributions	0	0
Benefits paid	(5)	(5)
Settlement of plan obligation	(139)	0
Fair value of plan assets at end of year	946	1,001	1,175
Funded status at end of year	50	55
Other Postretirement Benefits Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Benefit obligation at beginning of year	935	1,297
Service cost	54	63	63
Interest cost	48	34	33
Plan participants' contributions	129	137
Actuarial loss (gain)	37	(394)
Benefits paid	(190)	(202)
Settlement of plan obligation	0	0
Benefit obligation at end of year	1,013	935	1,297
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	61	65
Plan participants' contributions	129	137
Benefits paid	(190)	(202)
Settlement of plan obligation	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status at end of year	$ (1,013)	$ (935)