| Document and Entity Information | Oct. 22, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 22, 2020 |
| Entity Registrant Name | EAGLE FINANCIAL SERVICES, INC. |
| Entity Central Index Key | 0000880641 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-20146 |
| Entity Incorporation, State or Country Code | VA |
| Entity Tax Identification Number | 54-1601306 |
| Entity Address, Address Line One | 2 East Main StreetP.O. Box 391 |
| Entity Address, City or Town | Berryville |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 22611 |
| City Area Code | 540 |
| Local Phone Number | 955-2510 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | None |
| No Trading Symbol Flag | true |
| Name of each exchange on which registered | NONE |
