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Fair Value (Financial Instruments Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Commercial Portfolio Segment [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | $ 153 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | $ 157 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Impaired loans: |  |
Valuation Technique(s) | Income approach | Income approach
Fair Value Inputs, Adjustment for differences between the comparable market transactions | (16.00%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | (16.00%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Single-Family Residential[Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | 122 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember | 123 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Impaired loans: |  |
Valuation Technique(s) | Comparable sales approach | Comparable sales approach
Single-Family Residential[Member] | Minimum [Member] |  |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions | 2.35%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 2.35%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Real Estate, Commercial, Owner Occupied [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | 222 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember | 225 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember
Impaired loans: |  |
Valuation Technique(s) | Comparable sales approach | Comparable sales approach
Fair Value Inputs, Adjustment for differences between the comparable market transactions | (12.21%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember | (12.21%)cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember
Real Estate, Commercial, Land Acquisition [Member] |  |
Impaired loans: |  |
Impaired loans at Fair Value | $ 279 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember | $ 289 cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember
Impaired loans: |  |
Valuation Technique(s) | Comparable sales approach | Comparable sales approach
Real Estate, Commercial, Land Acquisition [Member] | Minimum [Member] |  |
Impaired loans: |  |
Fair Value Inputs, Adjustment for differences between the comparable market transactions | 8.10%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 8.10%cfbk_FairValueInputsNetComparableMarketTransactionsDifferenceAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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- Definition Fair value inputs net comparable market transactions difference adjustments. + References No definition available. + Details
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- Definition Impaired loans at fair value. + References No definition available. + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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