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EMPLOYEE BENEFIT PLANS - Salary Continuation Plan (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
employee
Dec. 31, 2014
employee
EMPLOYEE BENEFIT PLANS          
Defined Benefit Plan, Executive Officers Added to Plan | employee       2 1
Defined Benefit Plan, Benefit Term after Retirement or Death 15 years        
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]          
Defined Benefit Plan, Benefit Obligation $ 1,600        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 577 $ 545 $ 432