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STOCK OPTIONS - Schedule of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Outstanding at beginning of year (in shares) 471,442 340,377  
Granted (in shares) 101,000 159,598  
Exercised (in shares) (14,372) (7,033)  
Forfeited (in shares) (17,800) (21,500)  
Balance (in shares) 540,270 471,442 340,377
Weighted-Average Exercise Price      
Outstanding at beginning of year (in USD per share) $ 24.98 $ 23.43  
Granted (in USD per share) 32.29 27.80  
Exercised (in USD per share) 22.74 11.94  
Forfeited (in USD per share) 26.07 25.58  
Balance (in USD per share) $ 26.37 $ 24.98 $ 23.43
Weighted-Average Remaining Contractual Life in Years      
Outstanding 6 years 11 months 9 days 7 years 3 months 18 days 7 years 4 months 2 days
Granted 9 years 6 months 4 days 9 years 4 months 24 days  
Exercised 4 years 3 months 29 days 4 years 2 months 23 days  
Forfeited 6 years 8 months 16 days 8 years 7 months 2 days  
Aggregate Intrinsic Value      
Outstanding $ 2,696 $ 194  
Granted 5 480  
Exercised 102 132 $ 36
Forfeited 96 109  
Outstanding $ 2,160 $ 2,696 $ 194
Exercisable      
Outstanding (in shares) 207,271.2 134,644  
Weighted-average exercise price (in USD per share) $ 24.37 $ 23.60  
Weighted-average remaining contractual life in years 5 years 7 months 17 days 5 years 10 months 6 days  
Aggregate intrinsic value $ 1,141 $ 950