EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	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	$ 1,330	$ 1,270	$ 965
Employee stock ownership plan, shares held under plan (in shares)	1,225,828	1,224,697
Employee stock ownership plan, unallocated shares (in shares)	0	0
Cash surrender value of life insurance	$ 35,510	$ 34,495
Bonus expense	3,164	3,265	2,943
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	35,510	34,495
Plan cost	592	602	$ 502
Plan obligation	$ 4,383	$ 4,081