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STOCK OPTIONS - Schedule of Nonvested Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 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) | 59,000 | 109,200 |  |
Vested (in shares) | (33,740) | (36,840) |  |
Forfeited (in shares) | (1,600) | (4,000) |  |
Balance (in shares) | 360,458 | 319,060 | 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) | 32.66 | 27.00 |  |
Vested (in USD per share) | 25.30 | 25.40 |  |
Forfeited (in USD per share) | 23.00 | 23.17 |  |
Balance (in USD per share) | $ 26.91 | $ 24.66 | $ 25.54 | $ 23.73
Weighted-Average Remaining Contractual Life in Years |  |  |  |
Outstanding | 7 years 9 months | 7 years 10 months 10 days | 7 years 10 months 17 days | 7 years 7 months 24 days
Granted | 9 years 10 months 2 days | 9 years 10 months 24 days |  |
Vested | 8 years 1 month 10 days | 9 years 1 month 28 days |  |
Forfeited | 6 years 9 months 18 days | 7 years 4 months 17 days |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 1,747 | $ 69 | $ 69 |
Granted | 24 | 548 |  |
Vested | 258 | 244 |  |
Forfeited | 16 | 53 |  |
Outstanding | $ 2,165 | $ 2,347 | $ 1,747 | $ 69

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