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EMPLOYEE STOCK COMPENSATION - Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Number of Shares    
Outstanding at beginning of period (in shares) 210,973  
Exercised (in shares) (24,000)  
Outstanding at end of period (in shares) 186,973 210,973
Exercisable at end of period (in shares) 81,541  
Weighted-Average Exercise Price Per Share    
Outstanding at beginning of period (in dollars per share) $ 13.99  
Exercised (in dollars per share) 17.50  
Outstanding at end of period (in dollars per share) 13.54 $ 13.99
Exercisable at end of period (in dollars per share) $ 13.84  
Weighted-Average Remaining Contract Term    
Outstanding 6 years 6 months 21 days 6 years 11 months 18 days
Exercised 8 years 2 months 18 days  
Exercisable at end of period 5 years 11 months 4 days  
Aggregated Intrinsic Value    
Outstanding $ 1,077 $ 1,405
Exercisable at end of period $ 445