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EMPLOYEE BENEFIT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service Cost $ 72 $ 74
Interest cost 228 217
Expected return on plan assets (373) (369)
Amortization of unrecognized actuarial loss 117 84
Net periodic pension costs 44 6
Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service Cost 38 40
Interest cost 142 130
Amortization of net prior service credit 83 83
Amortization of unrecognized actuarial loss 0 0
Net periodic pension costs $ 263 $ 253