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EMPLOYEE BENEFIT PLANS - Components of net periodic cost (benefit) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EMPLOYEE BENEFIT PLANS      
Pension settlement loss $ 647,000    
Retirement Income Plan      
EMPLOYEE BENEFIT PLANS      
Service cost for benefits earned during the period 0 $ 0 $ 0
Interest cost on projected benefit obligation 230,000 255,000 251,000
Expected return on plan assets (292,000) (468,000) (501,000)
Amortization of net losses 98,000 87,000 81,000
Pension settlement loss 647,000 0 0
Net periodic cost (benefit) 683,000 (126,000) (169,000)
Employer contributions $ 550,000 $ 0 $ 770,000