EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net earnings attributable to Guaranty Bancshares, Inc.	$ 10,784	$ 10,432	$ 21,522	$ 21,394
Denominator:
Weighted-average shares outstanding (basic) (in shares)	11,968,227	12,056,550	12,038,261	12,047,643
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	130,756	195,037	135,252	168,311
Weighted-average shares outstanding (diluted) (in shares)	12,098,983	12,251,587	12,173,513	12,215,954
Net earnings attributable to Guaranty Bancshares, Inc. per share
Basic (in USD per share)	$ 0.90	$ 0.87	$ 1.79	$ 1.78
Diluted (in USD per share)	$ 0.89	$ 0.85	$ 1.77	$ 1.75