| Document And Entity Information | Feb. 15, 2022 |
| Document Information [Line Items] | |
| Entity, Registrant Name | USCB Financial Holdings, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Feb. 15, 2022 |
| Entity, Incorporation, State or Country Code | FL |
| Entity, File Number | 001-41196 |
| Entity, Tax Identification Number | 87-4070846 |
| Entity, Address, Address Line One | 2301 N.W. 87th Avenue |
| Entity, Address, City or Town | Miami |
| Entity, Address, State or Province | FL |
| Entity, Address, Postal Zip Code | 33172 |
| City Area Code | 305 |
| Local Phone Number | 715-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | USCB |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | true |
| Entity, Ex Transition Period | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001901637 |
