| Cover | Mar. 29, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Mar. 29, 2024 |
| Entity Registrant Name | 1st FRANKLIN FINANCIAL CORPORATION |
| Entity Incorporation, State or Country Code | GA |
| Entity File Number | 2-27985 |
| Entity Tax Identification Number | 58-0521233 |
| Entity Address, Address Line One | 135 East Tugalo Street |
| Entity Address, Address Line Two | P.O. Box 880 |
| Entity Address, City or Town | Toccoa |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30577 |
| City Area Code | 706 |
| Local Phone Number | 886-7571 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000038723 |
| Current Fiscal Year End Date | --12-31 |
