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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
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Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total | $ 422 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured | $ 2,571 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
Financing Receivable Recorded Investment Nonaccrual Status | 1,548 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 5,738 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total | 249 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 442 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Financing Receivable Recorded Investment Nonaccrual Status | 369 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 563 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Single-Family Residential[Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total | 173 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember | 190 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Financing Receivable Recorded Investment Nonaccrual Status | 549 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember | 479 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Multi-Family Residential [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total |  | 1,701 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialMultiFamilyMember
Financing Receivable Recorded Investment Nonaccrual Status |  | 1,701 us-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 | 477 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialNonOwnerOccupiedMember | 1,453 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialNonOwnerOccupiedMember
Real Estate, Commercial, Owner Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total |  | 238 cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember
Financing Receivable Recorded Investment Nonaccrual Status |  | $ 1,070 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialOwnerOccupiedMember

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