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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Plan [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Service cost $ 0 $ 0
Interest cost 20 23
Expected return on plan assets (30) (27)
Prior service cost 0 0
Recognized net actuarial loss (gain) 19 16
Total net periodic benefit cost 9 12
Other Postretirement Benefits Plan [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Service cost 63 46
Interest cost 33 39
Expected return on plan assets 0 0
Prior service cost (31) (31)
Recognized net actuarial loss (gain) (5) (14)
Total net periodic benefit cost $ 60 $ 40