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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
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 | $ 551 | $ 445 |
Employee stock ownership plan, fair value of shares subject to repurchase obligation |  | 34,300 |
Employee stock ownership plan, shares held under plan (in shares) | 1,322,550 |  | 1,314,277
Employee stock ownership plan, unallocated shares (in shares) | 0 |  | 0
Cash surrender value of life insurance | $ 25,590 |  | $ 19,117
Bonus expense | 1,513 | 1,103 |
Unfunded Plan | Nonqualified Plan | Executive Incentive Retirement Plan | Postretirement Life Insurance |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of life insurance | 25,590 |  | 19,117
Plan cost | 344 | $ 317 |
Plan obligation | $ 3,642 |  | $ 2,420

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