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STOCK OPTIONS - Schedule of Nonvested Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Number of Shares        
Outstanding at beginning of year (in shares) 336,798 250,700 250,700  
Granted (in shares) 90,000 150,598    
Vested (in shares) (45,899) (17,400)    
Forfeited (in shares) (9,400) (4,000)    
Balance (in shares) 371,499 379,898 336,798 250,700
Weighted-Average Exercise Price        
Outstanding at beginning of year (in USD per share) $ 25.54 $ 23.73 $ 23.73  
Granted (in USD per share) 32.59 27.64    
Vested (in USD per share) 25.64 23.13    
Forfeited (in USD per share) 23.41 23.17    
Balance (in USD per share) $ 27.28 $ 25.31 $ 25.54 $ 23.73
Weighted-Average Remaining Contractual Life in Years        
Outstanding 7 years 8 months 12 days 7 years 11 months 5 days 7 years 10 months 17 days 7 years 7 months 24 days
Granted 9 years 8 months 19 days 9 years 7 months 13 days    
Vested 7 years 11 months 4 days 7 years 10 months 28 days    
Forfeited 5 years 8 months 26 days 7 years 1 month 17 days    
Aggregate Intrinsic Value        
Outstanding $ 1,747 $ 69 $ 69  
Granted 0 657    
Vested 228 154    
Forfeited 81 53    
Outstanding $ 1,340 $ 2,538 $ 1,747 $ 69