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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension benefits    
Components of the plan's net periodic pension cost    
Service cost $ 20 $ 22
Interest cost 795 824
Expected return on plan assets (749) (729)
Amortization of unrecognized actuarial gain (44) (11)
Net periodic pension expense (benefit) 22 106
Postretirement benefits    
Components of the plan's net periodic pension cost    
Service cost 19 16
Interest cost 49 45
Amortization of unrecognized actuarial gain (14) (28)
Net periodic pension expense (benefit) $ 54 $ 33