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EMPLOYEE BENEFIT PLANS - Included in AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Supplemental Benefit Plan    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost    
Unrecognized net actuarial (gain) loss $ (18) $ 40
Postretirement Health Benefit Plan    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost    
Unrecognized net actuarial (gain) loss $ (9,269) $ (5,642)