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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, 2017 | Dec. 31, 2016
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Commitments To Make Loans [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 15,856 | $ 21,335
Variable Rate | 21,716 | 22,171
Unused Lines Of Credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | 8,068 | 3,714
Variable Rate | 38,760 | 29,621
Standby Letters Of Credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 1,115 | $ 991

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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: |