EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	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	$ 1,270	$ 1,125	$ 965
Employee stock ownership plan, shares held under plan (in shares)	1,224,697	1,333,504
Employee stock ownership plan, unallocated shares (in shares)	0	0
Cash surrender value of life insurance	$ 34,495	$ 26,301
Bonus expense	3,265	2,943	2,316
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	34,495	26,301
Plan cost	602	502	$ 447
Plan obligation	$ 4,081	$ 3,667