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EMPLOYEE STOCK COMPENSATION - Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Number of Shares        
Outstanding at beginning of period (in shares) 186,973 210,973 210,973  
Exercised (in shares)     (24,000)  
Outstanding at end of period (in shares) 186,973 186,973 186,973 210,973
Exercisable at end of period (in shares) 123,125   123,125  
Weighted-Average Exercise Price Per Share        
Outstanding at beginning of period (in dollars per share) $ 13.54 $ 13.99 $ 13.99  
Exercised (in dollars per share)     17.50  
Outstanding at end of period (in dollars per share) 13.54 $ 13.54 13.54 $ 13.99
Exercisable at end of period (in dollars per share) $ 13.67   $ 13.67  
Weighted-Average Remaining Contract Term        
Outstanding 6 years 20 days 6 years 3 months 19 days   6 years 11 months 18 days
Exercised     8 years 2 months 18 days  
Exercisable at end of period 5 years 9 months      
Aggregated Intrinsic Value        
Outstanding $ 1,002 $ 1,123 $ 1,002 $ 1,405
Excercised 0      
Exercisable at end of period $ 644   $ 644