| Document And Entity Information | Oct. 18, 2022 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 18, 2022 |
| Entity Registrant Name | BANK OF THE JAMES FINANCIAL GROUP, INC. |
| Entity File Number | 001-35402 |
| Entity Incorporation, State or Country Code | VA |
| Entity Tax Identification Number | 20-0500300 |
| Entity Address, Address Line One | 828 Main Street |
| Entity Address, City or Town | Lynchburg |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 24504 |
| City Area Code | 434 |
| Local Phone Number | 846-2000 |
| Entity Central Index Key | 0001275101 |
| Written communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $2.14 par value |
| Trading Symbol | BOTJ |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
