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Fair Value (Aggregate Fair Value, Contractual Balance And Gain Or Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value [Abstract]
Aggregate fair value	$ 2,241	$ 1,849
Contractual balance	$ 2,241	$ 1,849

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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

X

- 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