EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net earnings attributable to Guaranty Bancshares, Inc.	$ 40,447	$ 39,806	$ 27,402
Denominator:
Weighted-average shares outstanding (basic) (in shares)	11,980,209	12,065,182	12,219,420
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	112,638	146,576	36,059
Weighted-average shares outstanding (diluted) (in shares)	12,092,847	12,211,758	12,255,480
Net earnings per share
Basic (in USD per share)	$ 3.38	$ 3.30	$ 2.25
Diluted (in USD per share)	$ 3.34	$ 3.26	$ 2.24