EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
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	$ 404	$ 383
Employee stock ownership plan, shares held under plan (in shares)	1,334,895
Employee stock ownership plan, unallocated shares (in shares)	0
Cash surrender value of life insurance	$ 35,836		$ 35,510
Bonus expense	880	478
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	35,836		35,510
Plan cost	358	$ 296	592
Plan obligation	$ 4,705		$ 4,383