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STOCK OPTIONS - Schedule of Nonvested 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) 336,798 250,700  
Granted (in shares) 101,000 159,598  
Vested (in shares) (88,440) (54,500)  
Forfeited (in shares) (16,359) (19,000)  
Balance (in shares) 332,999 336,798 250,700
Weighted-Average Exercise Price      
Outstanding at beginning of year (in USD per share) $ 25.54 $ 23.73  
Granted (in USD per share) 32.29 27.80  
Vested (in USD per share) 25.51 23.72  
Forfeited (in USD per share) 26.07 25.58  
Balance (in USD per share) $ 27.62 $ 25.54 $ 23.73
Weighted-Average Remaining Contractual Life in Years      
Outstanding 7 years 9 months 7 years 10 months 17 days 7 years 7 months 24 days
Granted 9 years 6 months 4 days 9 years 4 months 24 days  
Vested 6 years 8 months 9 days 6 years 4 months 6 days  
Forfeited 6 years 8 months 16 days 8 years 7 months 2 days  
Aggregate Intrinsic Value      
Outstanding $ 1,747 $ 69  
Granted 5 480  
Vested 400 378  
Forfeited 96 109  
Outstanding $ 1,018 $ 1,747 $ 69