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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Additional disclosures    
Compensation expense, net of forfeitures $ 674 $ 496
Restricted Stock    
STOCK-BASED COMPENSATION    
Weighted average market value (in dollars per share) $ 42.24  
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) 155,712  
Awarded (in shares) 97,430  
Vested (in shares) (52,872)  
Forfeited (in shares) (1,785)  
Outstanding at end of period (in shares) 198,485  
Additional disclosures    
Compensation expense, net of forfeitures $ 674 $ 496
Restricted Stock | Performance-based vesting    
Number of Nonvested Restricted Shares    
Awarded (in shares) 76,629