EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Liabilities in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Pension Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Other assets	$ 50	$ 55
Accrued interest and other liabilities	0	0
Other Postretirement Benefits Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Other assets	0	0
Accrued interest and other liabilities	$ 1,013	$ 935