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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Additional disclosures        
Compensation expense, net of forfeitures     $ 1,094 $ 954
Restricted Stock        
STOCK-BASED COMPENSATION        
Weighted average market value (in dollars per share)     $ 33.84  
Service period over which value of the shares is amortized to compensation expense     3 years  
Number of Nonvested Restricted Shares        
Outstanding at beginning of period (in shares)     221,968  
Awarded (in shares)     56,499  
Vested (in shares)     (56,681)  
Forfeited (in shares)     (18,417)  
Outstanding at end of period (in shares) 203,369   203,369  
Additional disclosures        
Compensation expense, net of forfeitures $ 598 $ 488 $ 1,094 $ 954
Restricted Stock | Performance based vesting        
Number of Nonvested Restricted Shares        
Awarded (in shares)     30,603