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Loan Commitments And Other Related Activities (Contractual Amounts Of Financial Instruments With Off-Balance-Sheet Risk) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Commitments to make loans [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 86,001 | $ 1,072,963
Variable Rate | 135,429 | 31,239
Unused lines of credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | 33,620 | 20,395
Variable Rate | 73,812 | 65,788
Standby letters of credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 4,851 | $ 3,997

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- Definition Contractual Amount Of Financial Instruments With Off Balance Sheet Risk At Fixed Rate + References No definition available. + Details
Name: | cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual Amount Of Financial Instruments With Off Balance Sheet Risk At Variable Rate + References No definition available. + Details
Name: | cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Contingencies And Commitments [Line Items] + References No definition available. + Details
Name: | cfbk_OtherContingenciesAndCommitmentsLineItems
Namespace Prefix: | cfbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_LoanOriginationCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |