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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Funded Status of Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plan [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Benefit obligation at beginning of year $ 976 $ 870
Service cost 0 0
Interest cost 23 28
Plan participants' contributions 0 0
Actuarial (gain) loss 108 91
Benefits paid (6) (13)
Benefit obligation at end of year 1,101 976
Fair value of plan assets at beginning of year 971 847
Actual return on plan assets 97 137
Employer contribution 0 0
Plan participants' contributions 0 0
Benefits paid (6) (13)
Fair value of plan assets at end of year 1,062 971
Funded status at end of year (39) (5)
Other Postretirement Benefits Plan [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Benefit obligation at beginning of year 1,326 1,349
Service cost 46 33
Interest cost 39 50
Plan participants' contributions 185 184
Actuarial (gain) loss 11 (63)
Benefits paid (260) (227)
Benefit obligation at end of year 1,347 1,326
Fair value of plan assets at beginning of year 0 0
Actual return on plan assets 0 0
Employer contribution 75 43
Plan participants' contributions 185 184
Benefits paid (260) (227)
Fair value of plan assets at end of year 0 0
Funded status at end of year $ (1,347) $ (1,326)