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EMPLOYEE BENEFIT PLANS - Components of net periodic cost (benefit) (Details) - Retirement Income Plan - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
EMPLOYEE BENEFIT PLANS        
Interest cost $ 37 $ 58 $ 74 $ 116
Expected return on plan assets (72) (73) (144) (146)
Amortization of net losses 18 24 36 48
Net periodic cost (benefit) $ (17) $ 9 $ (34) $ 18