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Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis, Including Financial Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial Assets:      
Total securities available for sale $ 10,445us-gaap_AvailableForSaleSecurities $ 9,672us-gaap_AvailableForSaleSecurities  
Loans held for sale 1,672us-gaap_LoansHeldForSaleFairValueDisclosure 3,285us-gaap_LoansHeldForSaleFairValueDisclosure  
Yield maintenance provisions 318us-gaap_DerivativeAssets 599us-gaap_DerivativeAssets 990us-gaap_DerivativeAssets
Interest rate lock commitments 25cfbk_InterestRateLockCommitmentsFairValueDisclosure 16cfbk_InterestRateLockCommitmentsFairValueDisclosure  
Financial Liabilities:      
Interest-rate swaps 318cfbk_InterestRateSwapsFairValueDisclosure 599cfbk_InterestRateSwapsFairValueDisclosure  
Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 10,445us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
9,672us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Loans held for sale 1,672us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
3,285us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Yield maintenance provisions 318us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
599us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Interest rate lock commitments 25cfbk_InterestRateLockCommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
16cfbk_InterestRateLockCommitmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Financial Liabilities:      
Interest-rate swaps 318cfbk_InterestRateSwapsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
599cfbk_InterestRateSwapsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 10,445us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
9,672us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Loans held for sale 1,672us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
3,285us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | Corporate Debt [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 2,936us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
4,363us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | State and Municipal [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 886us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
1,919us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 5,011us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities - Residential [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 727us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
983us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Total securities available for sale 885us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
2,407us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CollateralizedMortgageObligationsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | Yield maintenance provisions (embedded derivatives) [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Yield maintenance provisions 318us-gaap_DerivativeAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
599us-gaap_DerivativeAssets
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Assets:      
Interest rate lock commitments 25cfbk_InterestRateLockCommitmentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
16cfbk_InterestRateLockCommitmentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]      
Financial Liabilities:      
Interest-rate swaps $ 318cfbk_InterestRateSwapsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 599cfbk_InterestRateSwapsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember