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RETIREMENT PLANS - Supplemental employee retirement plan defined benefit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block      
Net loss (gain) during the period $ (1,761) $ (5,323) $ (5,883)
Amortization of prior service cost     (1)
Amortization of unrecognized (gain) loss (752) (1,259) (2,072)
Total recognized in other comprehensive (income) loss (2,513) (6,582) (7,956)
Supplemental Employee Retirement Plans, Defined Benefit      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block      
Net loss (gain) during the period (144) (1,604) 54
Amortization of prior service cost 0 0 0
Amortization of unrecognized (gain) loss (84) (418) (441)
Total recognized in other comprehensive (income) loss $ (228) $ (2,022) $ (387)