PENSION AND OTHER POSTRETIREMENT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Change in benefit obligation:
Beginning benefit obligation	$ 1,546	$ 2,298
Interest cost	75	53	$ 52
Actuarial (gain) loss	(112)	(611)
Benefits paid	(12)	(194)
Ending benefit obligation	1,497	1,546	2,298
Change in plan assets (primarily equity and fixed income investments and money market funds), at fair value:
Beginning plan assets	1,820	2,303
Actual return	232	(289)
Employer contribution	0	0
Benefits paid	(217)	(194)
Ending plan assets	1,835	1,820	2,303
Funded status at end of year	338	274
SERP Benefits
Change in benefit obligation:
Beginning benefit obligation	700	867
Interest cost	33	20	18
Actuarial (gain) loss	93	(52)
Benefits paid	(133)	(135)
Ending benefit obligation	693	700	867
Change in plan assets (primarily equity and fixed income investments and money market funds), at fair value:
Beginning plan assets	606	848
Actual return	73	(107)
Employer contribution	0	0
Benefits paid	(133)	(135)
Ending plan assets	546	606	$ 848
Funded status at end of year	$ (147)	$ (94)