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STOCK OPTIONS - Schedule of 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) 471,442 340,377 340,377  
Granted (in shares) 90,000 150,598    
Exercised (in shares) (6,000) (7,033)    
Forfeited (in shares) (11,800) (6,000)    
Balance (in shares) 543,642 477,942 471,442 340,377
Weighted-Average Exercise Price        
Outstanding at beginning of year (in USD per share) $ 24.98 $ 23.43 $ 23.43  
Granted (in USD per share) 32.59 27.64    
Exercised (in USD per share) 23.33 11.94    
Forfeited (in USD per share) 23.41 23.17    
Balance (in USD per share) $ 26.29 $ 24.93 $ 24.98 $ 23.43
Weighted-Average Remaining Contractual Life in Years        
Outstanding 7 years 1 month 6 days 7 years 6 months 26 days 7 years 3 months 18 days 7 years 4 months 2 days
Granted 9 years 8 months 19 days 9 years 7 months 13 days    
Exercised 5 years 11 months 23 days 4 years 5 months 23 days    
Forfeited 5 years 8 months 26 days 7 years 1 month 17 days    
Aggregate Intrinsic Value        
Outstanding $ 2,393 $ 3,376 $ 2,696 $ 194
Granted 0 657    
Exercised 41 141    
Forfeited $ 81 $ 53    
Exercisable        
Outstanding (in shares) 172,143 98,044    
Weighted-average exercise price (in USD per share) $ 24.16 $ 23.45    
Weighted-Average Remaining Contractual Life in Years 5 years 9 months 14 days 6 years 2 months 1 day    
Aggregate Intrinsic Value $ 1,053 $ 838