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DEFERRED COMPENSATION LIABILITY (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Post Retirement Benefits [Abstract]      
Restricted deposit account $ 0 $ 0 $ 10,149
Total expense (gain) recognized (860) 1,303 1,369
Total deferred compensation liability $ 14,954 $ 15,814  
Executive Vice President and Chief Financial Officer [Member]      
Post Retirement Benefits [Abstract]      
Retirement age 67 years    
Imputed interest rate 2.60% 2.30%  
Chairman, President and CEO [Member]      
Post Retirement Benefits [Abstract]      
Retirement age 72 years    
Imputed interest rate 2.60% 2.30%  
Required service period 15 years    
Maximum benefit as a percentage of salary 66.00%    
Chief Executive Officer and Chief Financial Officer [Member]      
Post Retirement Benefits [Abstract]      
Total expense (gain) recognized $ (300) $ 1,300 $ 1,800