EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
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	$ 343	$ 301
Employee stock ownership plan, shares held under plan (in shares)	1,322,530		1,333,504
Employee stock ownership plan, unallocated shares (in shares)	0		0
Cash surrender value of life insurance	$ 26,458		$ 26,301
Bonus expense	715	819
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	26,458		26,301
Plan cost	285	$ 275
Plan obligation	$ 3,893		$ 3,667