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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
	Mar. 31, 2015	Dec. 31, 2014
Commercial Portfolio Segment [Member]
Impaired loans:
Impaired loans at Fair Value	$ 153cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	$ 157cfbk_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	122cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember	123cfbk_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	222cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember	225cfbk_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	$ 279cfbk_ImpairedLoansAtFairValue / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialLandAcquisitionMember	$ 289cfbk_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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Fair value inputs net comparable market transactions difference adjustments.

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Impaired loans at fair value.

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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

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