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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 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	$ 739	$ 727
Employee stock ownership plan, fair value of shares subject to repurchase obligation			$ 31,661
Employee stock ownership plan, shares held under plan (in shares)	1,314,277		1,319,225
Employee stock ownership plan, unallocated shares (in shares)	0		50,000
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	$ 18,376		$ 17,804
Bonus expense	1,718	1,451
Unfunded Plan | Nonqualified Plan | Executive Incentive Retirement Plan | Postretirement Life Insurance
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	18,376		17,804
Plan cost	381	$ 329
Plan obligation	$ 2,361		$ 2,002

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
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-SubTopic 40
-Section 50
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Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

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