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Fair Value (Aggregate Fair Value, Contractual Balance And Gain Or Loss) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Fair Value [Abstract] |  |
Aggregate fair value | $ 1,355 | $ 580
Contractual balance | $ 1,355 | $ 580

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- Definition Fair value option loans held as assets contractual amount. + References No definition available. + Details
Name: | cfbk_FairValueOptionLoansHeldAsAssetsContractualAmount
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
Name: | us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant