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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

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