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Securities (Narrative) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss $ 19,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss $ 15,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Issued by U.S. Government-Sponsored Entities and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Minimum percentage of securities hold 10.00%cfbk_MinimumPercentageOfSecuritiesHold
/ invest_InvestmentAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 10.00%cfbk_MinimumPercentageOfSecuritiesHold
/ invest_InvestmentAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized loss $ 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		 $ 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember