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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 store | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Stock split description |  | On May 4, 2012, the Company completed a 1-for-5 reverse stock split, whereby every 5 shares of the Company's common stock were reclassified into one share of common stock. |
Reverse stock split ratio |  | 0.2 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |
Number of full-service banking offices | 4 us-gaap_NumberOfStores |  |
Collateral pledged to secure advances | $ 36,887,000.00 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 | $ 28,493,000.00 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 |
Balances of loans of all other classes while impairment evaluation | 250,000 cfbk_MinimumOutstandingImpairedCommercialLoans |  |
Allowance for loans loss reduction | 250,000 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet |  |
Tax benefit greater than being realized on examination | 50.00%cfbk_PercentageOfRecognizedTaxBenefits |  |
Loan servicing fees, net | 17,000 us-gaap_ServicingFeesNet | 19,000 us-gaap_ServicingFeesNet | 26,000 us-gaap_ServicingFeesNet
Estimated life of intangible asset | 4 years 6 months |  |
Cash [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Collateral pledged to secure advances | $ 3,300,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | $ 3,300,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 / us-gaap_InvestmentTypeAxis = us-gaap_CashMember |
Minimum [Member] | Land, buildings and improvements [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 3 years |  |
Minimum [Member] | Furniture, fixtures and equipment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 2 years |  |
Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Home equity lines of credit combined with the balance of the prior mortgage liens | 89.90%cfbk_CombinedPercentageOfCommercialRealEstateAndCommercialConstructionInPortfolioLoans / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Land, buildings and improvements [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 40 years |  |
Maximum [Member] | Furniture, fixtures and equipment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 25 years |  |
Single-family residential [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Residential real estate loan amount for portfolio | 85.00%cfbk_PercentageOfResidentialRealEstateLoansInLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_SingleFamilyResidentialRealEstateMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Multi-family residential [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Residential real estate loan amount for portfolio | 85.00%cfbk_PercentageOfResidentialRealEstateLoansInLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_MultiFamilyResidentialRealEstateMember |  |
Multi-family residential [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Fixed rates loans limit, period | 3 years |  |
Multi-family residential [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Fixed rates loans limit, period | 5 years |  |
Commercial Real Estate [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Fixed rates loans limit, period | 3 years |  |
Commercial Real Estate [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Residential real estate loan amount for portfolio | 80.00%cfbk_PercentageOfResidentialRealEstateLoansInLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Fixed rates loans limit, period | 5 years |  |
Construction Loans [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Residential real estate loan amount for portfolio | 75.00%cfbk_PercentageOfResidentialRealEstateLoansInLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConstructionLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maturity of construction loans convert to permanent loans | 30 years |  |

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