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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 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   $ 11,746,000 $ 10,622,000   $ 11,746,000   $ 10,622,000
Trading (losses) gains related to the SERP assets   895,000   $ 1,015,000 1,124,000 $ (63,000)  
Pension And Other Postretirement Defined Benefit Plans Liabilities Deferrals Net of Distribution Stated at Fair Value         14,443,000   $ 12,524,000
Change in fair value of liability unrealized gains   $ 934,000   $ 1,452,000 $ 1,097,000 $ 25,000