EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
STOCK-BASED COMPENSATION PLANS
Stock-based compensation expense	$ 1,472	$ 1,260	$ 1,214
Restricted Stock
STOCK-BASED COMPENSATION PLANS
Stock-based compensation expense	1,472	1,260	1,214
Employee Stock Option [Member]
STOCK-BASED COMPENSATION PLANS
Stock-based compensation expense	$ 0	$ 0	$ 0