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PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Funded status included in other liabilities $ (243) $ (33)
SERP Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Funded status included in other liabilities $ (77) $ (39)