| Document And Entity Information | Sep. 29, 2021 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 29, 2021 |
| Entity Registrant Name | CF BANKSHARES INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 0-25045 |
| Entity Tax Identification Number | 34-1877137 |
| Entity Address, Address Line One | 7000 N. High Street |
| Entity Address, City or Town | Worthington |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 43085 |
| City Area Code | 614 |
| Local Phone Number | 334-7979 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $.01 par value |
| Trading Symbol | CFBK |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001070680 |
| Amendment Flag | false |
