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STOCK OPTIONS - Schedule of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Number of Shares        
Beginning balance (in shares) 340,377 314,391 314,391  
Granted (in shares) 9,000 21,000    
Exercised (in shares) (2,010)      
Forfeited (in shares) (1,000) (10,400)    
Ending balance (in shares) 346,367 324,991 340,377 314,391
Weighted-Average Exercise Price        
Beginning balance (in USD per share) $ 23.43 $ 23.28 $ 23.28  
Granted (in USD per share) 26.00 23.00    
Exercised (in USD per share) 11.94      
Forfeited (in USD per share) 24.00 23.23    
Ending balance (in USD per share) $ 23.56 $ 23.27 $ 23.43 $ 23.28
Weighted-Average Remaining Contractual Life in Years        
Outstanding 7 years 2 months 9 days 7 years 10 months 10 days 7 years 4 months 2 days 8 years
Granted 9 years 11 months 16 days 8 years 9 months 15 days    
Exercised 3 years 29 days      
Forfeited 5 years 6 months 18 days 7 years 8 months 27 days    
Aggregate Intrinsic Value        
Outstanding $ 844 $ 238 $ 194 $ 225
Granted 0 21    
Intrinsic value of options exercised 28      
Forfeited $ 2 $ 8    
Exercisable        
Outstanding (in shares) 92,667 47,191    
Weighted-average exercise price (in USD per share) $ 22.91 $ 20.83    
Weighted-average remaining contractual life in years 6 years 5 months 16 days 6 years 6 months 4 days    
Aggregate intrinsic value $ 287 $ 149