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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension benefits        
Components of the plan's net periodic pension cost        
Service cost $ 20 $ 22 $ 60 $ 67
Interest cost 795 824 2,386 2,473
Expected return on plan assets (749) (729) (2,249) (2,188)
Amortization of unrecognized actuarial gain (44) (11) (131) (32)
Net periodic pension expense (benefit) 22 106 66 320
Postretirement benefits        
Components of the plan's net periodic pension cost        
Service cost 19 16 57 49
Interest cost 49 45 147 136
Amortization of unrecognized actuarial gain (14) (28) (41) (84)
Net periodic pension expense (benefit) $ 54 $ 33 $ 163 $ 101