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Loans (Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Nonaccrual Troubled Debt Restructurings, Total $ 422cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured $ 2,571cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
Financing Receivable Recorded Investment Nonaccrual Status 1,548us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 5,738us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Portfolio Segment [Member]    
Financing Receivable, Modifications [Line Items]    
Nonaccrual Troubled Debt Restructurings, Total 249cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
442cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Financing Receivable Recorded Investment Nonaccrual Status 369us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
563us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Single-Family Residential[Member]    
Financing Receivable, Modifications [Line Items]    
Nonaccrual Troubled Debt Restructurings, Total 173cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialSingleFamilyMember
190cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialSingleFamilyMember
Financing Receivable Recorded Investment Nonaccrual Status 549us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialSingleFamilyMember
479us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialSingleFamilyMember
Multi-Family Residential [Member]    
Financing Receivable, Modifications [Line Items]    
Nonaccrual Troubled Debt Restructurings, Total   1,701cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialMultiFamilyMember
Financing Receivable Recorded Investment Nonaccrual Status   1,701us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialMultiFamilyMember
Real Estate, Commercial, Non-Owner Occupied [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Recorded Investment Nonaccrual Status 477us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateCommercialNonOwnerOccupiedMember
1,453us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateCommercialNonOwnerOccupiedMember
Real Estate, Commercial, Owner Occupied [Member]    
Financing Receivable, Modifications [Line Items]    
Nonaccrual Troubled Debt Restructurings, Total   238cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateCommercialOwnerOccupiedMember
Financing Receivable Recorded Investment Nonaccrual Status   $ 1,070us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateCommercialOwnerOccupiedMember