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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |
Employee stock ownership plan, maximum employer contribution as a percentage of participant's qualified compensation | 5.00% |  |
Employee stock ownership plan, total contributions accrued or paid | $ 445 | $ 491 |
Employee stock ownership plan, fair value of shares subject to repurchase obligation |  |  | $ 31,661
Employee stock ownership plan, shares held under plan (in shares) | 1,319,225 |  | 1,319,225
Employee stock ownership plan, unallocated shares (in shares) | 50,000 |  | 50,000
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of life insurance | $ 18,035 |  | $ 17,804
Bonus expense | 1,103 | 931 |
Unfunded Plan | Nonqualified Plan | Executive Incentive Retirement Plan | Postretirement Life Insurance |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of life insurance | 18,035 |  | 17,804
Plan cost | 317 | $ 275 |
Plan obligation | $ 2,305 |  | $ 2,002

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