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STOCK-BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Additional disclosures        
Compensation expense, net of forfeitures     $ 1,540 $ 1,094
Restricted Stock        
STOCK-BASED COMPENSATION        
Weighted average market value (in dollars per share)     $ 42.03  
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)     198,485  
Awarded (in shares)     10,398  
Vested (in shares)     (14,056)  
Outstanding at end of period (in shares) 194,827   194,827  
Additional disclosures        
Compensation expense, net of forfeitures $ 866 $ 598    
Restricted Stock | Performance-based vesting        
Number of Nonvested Restricted Shares        
Awarded (in shares)     76,629