| Document And Entity Information | Jan. 26, 2023 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Summit Financial Group, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Jan. 26, 2023 |
| Entity, Incorporation, State or Country Code | WV |
| Entity, File Number | 0-16587 |
| Entity, Tax Identification Number | 55-0672148 |
| Entity, Address, Address Line One | 300 North Main Street |
| Entity, Address, City or Town | Moorefield |
| Entity, Address, State or Province | WV |
| Entity, Address, Postal Zip Code | 26836 |
| City Area Code | 304 |
| Local Phone Number | 530-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, Par Value $2.50 per share |
| Trading Symbol | SMMF |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000811808 |
