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Branch Sale (Narrative) (Details) $ in Millions | 3 Months Ended
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Sep. 30, 2021 USD ($)
Branch Sale [Abstract] |
Gain on sale of deposits | $ 1.9

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- Definition Gain On Sale Of Deposits + References No definition available. + Details
Name: | cfbk_GainOnSaleOfDeposits
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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