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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, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Number of Shares        
Outstanding at beginning of year (in shares) 340,377 314,391 314,391  
Granted (in shares) 150,598 37,500    
Exercised (in shares) (7,033)      
Forfeited (in shares) (6,000) (19,000)    
Balance (in shares) 477,942 332,891 340,377 314,391
Weighted-Average Exercise Price        
Outstanding at beginning of year (in USD per share) $ 23.43 $ 23.28 $ 23.28  
Granted (in USD per share) 27.64 23.44    
Exercised (in USD per share) 11.94      
Forfeited (in USD per share) 23.17 23.16    
Balance (in USD per share) $ 24.93 $ 23.31 $ 23.43 $ 23.28
Weighted-Average Remaining Contractual Life in Years        
Outstanding 7 years 6 months 26 days 7 years 5 months 12 days 7 years 4 months 2 days 8 years
Granted 9 years 7 months 14 days 9 years 6 months    
Exercised 4 years 5 months 23 days      
Forfeited 7 years 1 month 17 days 8 years 1 month 24 days    
Aggregate Intrinsic Value        
Outstanding $ 3,376 $ 230 $ 194 $ 225
Granted 657 21    
Exercised 141      
Forfeited $ 53 $ 16    
Exercisable        
Outstanding (in shares) 98,044 58,491    
Weighted-average exercise price (in USD per share) $ 23.45 $ 21.24    
Weighted-Average Remaining Contractual Life in Years 6 years 2 months 1 day 6 years 6 months 11 days    
Aggregate Intrinsic Value $ 838 $ 161