Cover
| Cover | Jun. 02, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 2, 2022 |
| Entity File Number | 001-38647 |
| Entity Registrant Name | FVCBankcorp, Inc. |
| Entity Central Index Key | 0001675644 |
| Entity Tax Identification Number | 47-5020283 |
| Entity Incorporation, State or Country Code | VA |
| Entity Address, Address Line One | 11325 Random Hills Road |
| Entity Address, City or Town | Fairfax |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 22030 |
| City Area Code | 703 |
| Local Phone Number | 436-3800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | FVCB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |