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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 1,125	$ 965	$ 935
Employee stock ownership plan, shares held under plan (in shares)	1,333,504	1,314,277
Employee stock ownership plan, unallocated shares (in shares)	0	0
Cash surrender value of life insurance	$ 26,301	$ 19,117
Bonus expense	2,943	2,316	2,069
Unfunded Plan | Nonqualified Plan | Executive Incentive Retirement Plan | Postretirement Life Insurance
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	26,301	19,117
Plan cost	502	447	$ 390
Plan obligation	$ 3,667	$ 2,420

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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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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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

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