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Loans (Loans Modified As TDRs By Class Of Loans) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 loan | Dec. 31, 2013 loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Recorded Investment | $ 104 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | $ 2,469 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Recorded Investment | 100 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | 2,416 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Financing Receivable, Modifications, Recorded Investment | 5,700 us-gaap_FinancingReceivableModificationsRecordedInvestment | 6,100 us-gaap_FinancingReceivableModificationsRecordedInvestment
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Pre-Modification Recorded Investment | 104 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 126 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Post-Modification Recorded Investment | 100 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 126 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Single-Family Residential[Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Pre-Modification Recorded Investment |  | 346 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Post-Modification Recorded Investment |  | 350 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Multi-Family Residential [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialMultiFamilyMember
Pre-Modification Recorded Investment |  | 1,760 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialMultiFamilyMember
Post-Modification Recorded Investment |  | 1,701 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialMultiFamilyMember
Real Estate, Commercial, Owner Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember
Pre-Modification Recorded Investment |  | 237 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember
Post-Modification Recorded Investment |  | $ 239 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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