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STOCK OPTIONS - Schedule of Nonvested 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) 250,700 267,200 267,200  
Granted (in shares) 9,000 21,000    
Vested (in shares) (6,000) (10,400)    
Ending balance (in shares) 253,700 277,800 250,700 267,200
Weighted-Average Exercise Price        
Beginning balance (in USD per share) $ 23.73 $ 23.72 $ 23.72  
Granted (in USD per share) 26.00 23.00    
Vested (in USD per share) 23.90 23.23    
Ending balance (in USD per share) $ 23.80 $ 23.68 $ 23.73 $ 23.72
Weighted-Average Remaining Contractual Life in Years        
Outstanding 7 years 5 months 16 days 8 years 1 month 2 days 7 years 7 months 24 days 8 years 2 months 19 days
Granted 9 years 11 months 16 days 8 years 9 months 15 days    
Vested 9 years 1 month 24 days 7 years 5 months 19 days    
Aggregate Intrinsic Value        
Outstanding $ 557 $ 89 $ 69 $ 0
Granted 0 21    
Vested $ 13 $ 8