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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2020
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 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   $ 12,113,000 $ 10,622,000   $ 12,113,000   $ 10,622,000
Trading gains related to the SERP assets   366,000   $ 326,000 1,491,000 $ 263,000  
Pension And Other Postretirement Defined Benefit Plans Liabilities Deferrals Net of Distribution Stated at Fair Value         15,070,000   $ 12,524,000
Change in fair value of liability unrealized gains   $ 381,000   $ 458,000 $ 1,478,000 $ 483,000