| Document And Entity Information | Jul. 19, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 19, 2021 |
| Entity Registrant Name | GUARANTY BANCSHARES, INC. |
| Entity Central Index Key | 0001058867 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-38087 |
| Entity Incorporation, State or Country Code | TX |
| Entity Tax Identification Number | 75-1656431 |
| Entity Address, Address Line One | 16475 Dallas Parkway |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, City or Town | Addison |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75001 |
| City Area Code | 888 |
| Local Phone Number | 572-9881 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | true |
| Title of 12(b) Security | Common Stock, par value $1.00 per share |
| Trading Symbol | GNTY |
| Security Exchange Name | NASDAQ |
