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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Additional disclosures    
Compensation expense, net of forfeitures $ 496 $ 466
Restricted Stock    
STOCK-BASED COMPENSATION    
Weighted average market value (in dollars per share) $ 32.63  
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) 48,492  
Vested (in shares) (44,319)  
Forfeited (in shares) (17,808)  
Outstanding at end of period (in shares) 208,333  
Additional disclosures    
Compensation expense, net of forfeitures $ 496 $ 466
Restricted Stock | Performance based vesting    
Number of Nonvested Restricted Shares    
Awarded (in shares) 30,603