| Document And Entity Information | Jul. 18, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 18, 2024 |
| Entity Registrant Name | BV FINANCIAL, INC. |
| Entity Central Index Key | 0001302387 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-36094 |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 14-1920944 |
| Entity Address, Address Line One | 7114 North Point Blvd. |
| Entity Address, City or Town | Baltimore |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 21219 |
| City Area Code | 410 |
| Local Phone Number | 477-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | BVFL |
| Security Exchange Name | NASDAQ |
