| Document and Entity Information | Apr. 28, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 28, 2022 |
| Entity Registrant Name | Primis Financial Corp. |
| Entity Central Index Key | 0001325670 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-33037 |
| Entity Incorporation State Country Code | VA |
| Entity Tax Identification Number | 20-1417448 |
| Entity Address, Address Line One | 6830 Old Dominion Drive |
| Entity Address, City or Town | McLean |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 22101 |
| City Area Code | (703) |
| Local Phone Number | 893-7400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | COMMON STOCK |
| Trading Symbol | FRST |
| Security Exchange Name | NASDAQ |
