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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
 1 Months Ended 3 Months Ended
Oct. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Vested balance age 59 years 6 months      
SERP        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     $ 600,000  
Fair value of plan assets   $ 10,851,000 10,622,000  
Trading (losses) gains related to the SERP assets   63,000   $ 1,078,000
Pension And Other Postretirement Defined Benefit Plans Liabilities Deferrals Net of Distribution Stated at Fair Value   (13,209,000)    
Liabilities deferrals net of distribution stated at fair value     $ 12,524,000  
Change in fair value of liability unrealized gains   $ 163,000    
Change in fair value of retirement plan liability of unrealized gains (loss)"       $ (1,427,000)