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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, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Number of Shares        
Outstanding at beginning of year (in shares) 250,700 267,200 267,200  
Granted (in shares) 150,598 37,500    
Vested (in shares) (17,400) (13,500)    
Forfeited (in shares) (4,000) (16,800)    
Balance (in shares) 379,898 274,400 250,700 267,200
Weighted-Average Exercise Price        
Outstanding at beginning of year (in USD per share) $ 23.73 $ 23.72 $ 23.72  
Granted (in USD per share) 27.64 23.44    
Vested (in USD per share) 23.13 23.00    
Forfeited (in USD per share) 23.17 23.16    
Balance (in USD per share) $ 25.31 $ 23.75 $ 23.73 $ 23.72
Weighted-Average Remaining Contractual Life in Years        
Outstanding 7 years 11 months 5 days 7 years 7 months 24 days 7 years 7 months 24 days 8 years 2 months 19 days
Granted 9 years 7 months 14 days 9 years 6 months    
Vested 7 years 10 months 28 days 8 years 7 months 2 days    
Forfeited 7 years 1 month 17 days 8 years 1 month 24 days    
Aggregate Intrinsic Value        
Outstanding $ 69 $ 76 $ 76  
Granted 657 21    
Vested 154 14    
Forfeited 53 16    
Outstanding $ 2,538 $ 69 $ 69 $ 76