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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, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Number of Shares |  |  |  |
Outstanding at beginning of year (in shares) | 331,560 | 334,400 | 334,400 |
Granted (in shares) | 35,000 | 90,000 |  |
Vested (in shares) | (54,340) | (44,940) |  |
Forfeited (in shares) | (23,600) | (9,400) |  |
Balance (in shares) | 288,620 | 370,060 | 331,560 | 334,400
Weighted-Average Exercise Price |  |  |  |
Outstanding at beginning of year (in USD per share) | $ 27.74 | $ 25.72 | $ 25.72 |
Granted (in USD per share) | 29.85 | 32.59 |  |
Vested (in USD per share) | 28.10 | 26.19 |  |
Forfeited (in USD per share) | 33.03 | 29.38 |  |
Balance (in USD per share) | $ 27.78 | $ 27.39 | $ 27.74 | $ 25.72
Weighted-Average Remaining Contractual Life in Years |  |  |  |
Outstanding | 7 years 1 month 28 days | 7 years 8 months 19 days | 7 years 9 months 7 days | 7 years 10 months 28 days
Granted | 9 years 7 months 9 days | 9 years 8 months 19 days |  |
Vested | 7 years 5 months 23 days | 8 years 14 days |  |
Forfeited | 9 years 2 months 4 days | 7 years 2 months 12 days |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 975 | $ 1,673 | $ 1,673 |
Granted | 26 | 0 |  |
Vested | 172 | 199 |  |
Forfeited | 46 | 81 |  |
Outstanding | $ 949 | $ 1,297 | $ 975 | $ 1,673

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