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EMPLOYEE BENEFIT PLANS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
USD ($)
employee
Dec. 31, 2017
USD ($)
EMPLOYEE BENEFIT PLANS      
Contribution liability $ 6,194 $ 6,017  
Stop loss coverage $ 130    
Number of Participant | employee 566 570  
Claims and Administrative service fees $ 5,638 $ 6,139 $ 6,178
SERP      
EMPLOYEE BENEFIT PLANS      
Defined contribution plan term 30 years    
Deferred compensation liability $ 12,789 9,179  
Compensation expense 4,291 505 514
Profit Sharing Plan      
EMPLOYEE BENEFIT PLANS      
Contribution expense $ 1,223 $ 1,109 $ 920
Employees contributions vesting period 6 years