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Fair Value (Financial Instruments Measured At Fair Value On A Non-Recurring Basis) (Details) (Financial instruments measured at fair value on a non-recurring basis [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commercial Portfolio Segment [Member] | Income approach [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | $ 157 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions | (16.00%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Single-Family Residential[Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | 123 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember | 316 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions | 2.35%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember | (8.33%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Single-Family Residential[Member] | Minimum [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions |  | (17.67%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Single-Family Residential[Member] | Maximum [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions |  | 2.35%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Multi-Family Residential [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value |  | 1,301 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialMultiFamilyMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions |  | (20.59%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialMultiFamilyMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Real Estate, Commercial, Owner Occupied [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | 225 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember | 234 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions | (12.21%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember | (12.21%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Real Estate, Commercial, Land Acquisition [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value |  | 629 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember
Real Estate, Commercial, Land Acquisition [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | $ 289 cfbk_ImpairedLoansAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions | 8.10%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember | 1.44%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Real Estate, Commercial, Land Acquisition [Member] | Minimum [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions |  | (8.59%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember
Real Estate, Commercial, Land Acquisition [Member] | Maximum [Member] | Comparable sales approach [Member] |  |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions |  | 8.10%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = cfbk_ComparableSalesApproachValuationTechniqueMember

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