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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, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Number of Shares |  |  |  |
Beginning balance (in shares) | 250,700 | 267,200 | 267,200 |
Granted (in shares) | 109,200 | 26,500 |  |
Vested (in shares) | (36,840) | (12,300) |  |
Forfeited (in shares) | (4,000) | (16,800) |  |
Ending balance (in shares) | 319,060 | 264,600 | 250,700 | 267,200
Weighted-Average Exercise Price |  |  |  |
Beginning balance (in USD per share) | $ 23.73 | $ 23.72 | $ 23.72 |
Granted (in USD per share) | 27.00 | 23.21 |  |
Vested (in USD per share) | 25.40 | 23.00 |  |
Forfeited (in USD per share) | 23.17 | 23.17 |  |
Ending balance (in USD per share) | $ 24.66 | $ 23.74 | $ 23.73 | $ 23.72
Weighted-Average Remaining Contractual Life in Years |  |  |  |
Outstanding | 7 years 10 months 10 days | 7 years 9 months 26 days | 7 years 7 months 24 days | 8 years 2 months 19 days
Granted | 9 years 10 months 24 days | 9 years 7 months 2 days |  |
Vested | 9 years 1 month 28 days | 8 years 9 months 22 days |  |
Forfeited | 7 years 4 months 17 days | 8 years 4 months 13 days |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 2,347 | $ 70 | $ 69 | $ 76
Granted | 548 | 21 |  |
Vested | 244 | 12 |  |
Forfeited | $ 53 | $ 14 |  |

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