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Fair Value (Assets Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Impaired loans: |  |
Total impaired loans | $ 6,861 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance | $ 7,093 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans | 776 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 794 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Commercial Portfolio Segment [Member] | Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans | 153 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 157 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Single-Family Residential[Member] | Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans | 122 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember | 123 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Multi-Family Residential [Member] | Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans |  |
Real Estate, Commercial, Non-Owner Occupied [Member] | Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans |  |
Real Estate, Commercial, Owner Occupied [Member] | Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans | 222 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember | 225 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember
Real Estate, Commercial, Land Acquisition [Member] | Financial instruments measured at fair value on a non-recurring basis [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans: |  |
Total impaired loans | $ 279 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember | $ 289 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember

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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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