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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, 2020 | Dec. 31, 2019
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Commitments to make loans [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 1,072,963 | $ 314,705
Variable Rate | 31,239 | 43,979
Unused lines of credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | 20,395 | 10,678
Variable Rate | 65,788 | 55,684
Standby letters of credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 3,997 | $ 1,415

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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: |

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