EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net earnings attributable to Guaranty Bancshares, Inc.	$ 10,903	$ 9,253	$ 32,425	$ 30,647
Denominator:
Weighted-average shares outstanding (basic) (in shares)	11,907,233	12,067,769	11,994,105	12,054,426
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	125,158	143,620	125,344	155,058
Weighted-average shares outstanding (diluted) (in shares)	12,032,391	12,211,389	12,119,449	12,209,484
Net earnings attributable to Guaranty Bancshares, Inc. per share
Basic (in USD per share)	$ 0.92	$ 0.77	$ 2.70	$ 2.54
Diluted (in USD per share)	$ 0.91	$ 0.76	$ 2.68	$ 2.51