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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Additional disclosures        
Compensation expense, net of forfeitures     $ 2,374 $ 1,787
Restricted Stock        
STOCK-BASED COMPENSATION        
Weighted average market value (in dollars per share)     $ 41.98  
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)     155,742  
Awarded (in shares)     108,801  
Vested (in shares)     (70,410)  
Forfeited (in shares)     (1,989)  
Outstanding at end of period (in shares) 192,144   192,144  
Additional disclosures        
Compensation expense, net of forfeitures $ 834 $ 694    
Restricted Stock | Performance-based vesting        
Number of Nonvested Restricted Shares        
Awarded (in shares)     76,877