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DEFERRED COMPENSATION LIABILITY (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Post Retirement Benefits With Individual Employees [Line Items]      
Total expense recognized $ 1,303 $ 1,369 $ 324
Total deferred compensation liability $ 15,800 $ 14,500  
Executive Vice President and Chief Financial Officer [Member]      
Post Retirement Benefits With Individual Employees [Line Items]      
Retirement age 67 years    
Imputed interest rate 2.30% 2.60%  
Chairman, President and CEO [Member]      
Post Retirement Benefits With Individual Employees [Line Items]      
Retirement age 72 years    
Imputed interest rate 2.30% 2.60%  
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 With Individual Employees [Line Items]      
Total expense recognized $ 1,300 $ 1,800 $ 400