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Foreclosed Assets (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Foreclosed Assets [Abstract] |  |  |
Expenses related to foreclosed assets | $ 0 | $ 0 | $ 0

X
- Definition Foreclosed Assets, Net + References No definition available. + Details
Name: | cfbk_ForeclosedAssetsNet
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ForeclosedAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration