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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, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Number of Shares |  |  |  |
Outstanding at beginning of year (in shares) | 336,798 | 250,700 | 250,700 |
Granted (in shares) | 90,000 | 150,598 |  |
Vested (in shares) | (45,899) | (17,400) |  |
Forfeited (in shares) | (9,400) | (4,000) |  |
Balance (in shares) | 371,499 | 379,898 | 336,798 | 250,700
Weighted-Average Exercise Price |  |  |  |
Outstanding at beginning of year (in USD per share) | $ 25.54 | $ 23.73 | $ 23.73 |
Granted (in USD per share) | 32.59 | 27.64 |  |
Vested (in USD per share) | 25.64 | 23.13 |  |
Forfeited (in USD per share) | 23.41 | 23.17 |  |
Balance (in USD per share) | $ 27.28 | $ 25.31 | $ 25.54 | $ 23.73
Weighted-Average Remaining Contractual Life in Years |  |  |  |
Outstanding | 7 years 8 months 12 days | 7 years 11 months 5 days | 7 years 10 months 17 days | 7 years 7 months 24 days
Granted | 9 years 8 months 19 days | 9 years 7 months 13 days |  |
Vested | 7 years 11 months 4 days | 7 years 10 months 28 days |  |
Forfeited | 5 years 8 months 26 days | 7 years 1 month 17 days |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 1,747 | $ 69 | $ 69 |
Granted | 0 | 657 |  |
Vested | 228 | 154 |  |
Forfeited | 81 | 53 |  |
Outstanding | $ 1,340 | $ 2,538 | $ 1,747 | $ 69

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