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EMPLOYEE BENEFIT PLANS - SERP (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Benefit Plans      
Pension liabilities $ 15,564,000 $ 12,524,000  
Settlement loss   (647,000)  
Vested balance age 65 years    
SERP      
Employee Benefit Plans      
Variable life insurance policies investment amount $ 9,700,000 8,600,000  
Fair value of plan assets 12,264,000 10,622,000  
Trading gains related to the SERP assets 1,643,000 906,000 $ 1,197,000
Pension liabilities 15,564,000 12,524,000  
Change in fair value of liability unrealized gains $ 1,647,000 $ 1,395,000 $ 1,501,000