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Loan Commitments and Other Related Activities (Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments To Make Loans [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | $ 14,992 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember | $ 8,169 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember
Variable Rate | 17,339 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember | 11,569 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate / us-gaap_FinancialInstrumentAxis = us-gaap_LoanOriginationCommitmentsMember
Unused Lines Of Credit [Member] |  |
Other Contingencies And Commitments [Line Items] |  |
Fixed Rate | 189 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | 47 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Variable Rate | $ 26,955 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | $ 22,993 cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember

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

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- Details
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Namespace Prefix: | cfbk_
Data Type: | xbrli:stringItemType
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- Details
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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: |