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Loans (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]      
Loans $ 266,259us-gaap_LoansAndLeasesReceivableNetReportedAmount   257,085us-gaap_LoansAndLeasesReceivableNetReportedAmount
Cash payments of interest 83us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod 54us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod  
Loans 90 days or more past due and still accruing interest 366us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing    
Allocated specific reserves to modified TDRs 54cfbk_AllocatedSpecificReservesToModifiedTdrs   64cfbk_AllocatedSpecificReservesToModifiedTdrs
Number of days of default payment 90 days    
Total TDR's 5,500us-gaap_FinancingReceivableModificationsRecordedInvestment   5,700us-gaap_FinancingReceivableModificationsRecordedInvestment
Accruing TDR's 5,087cfbk_TroubleDebtRestructuringAccrualFinancialReceivables   5,233cfbk_TroubleDebtRestructuringAccrualFinancialReceivables
Recorded investment of loans undergoing modifications, not TDRs 2,500cfbk_LoansModifiedNotTroubledDebtRestructuringsRecordedInvestment 379cfbk_LoansModifiedNotTroubledDebtRestructuringsRecordedInvestment  
Minimum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Percent of participation agreement interest     80.00%cfbk_LoansParticipationAgreementPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Percent of participation agreement interest     95.00%cfbk_LoansParticipationAgreementPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Mortgage Purchase Program Member [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Percent of loans risk rated for capital adequacy 100.00%cfbk_PercentOfLoansHeldRiskRatedForCapitalAdequacy
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_MortgagesMember
   
Northpointe [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Ownership interest in each loan is participates 5.00%cfbk_OwnershipInterestInEachLoan
/ dei_LegalEntityAxis
= cfbk_NorthpointeMember
  20.00%cfbk_OwnershipInterestInEachLoan
/ dei_LegalEntityAxis
= cfbk_NorthpointeMember
Single-Family Residential[Member] | Mortgage Purchase Program Member [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loans $ 27,837us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialSingleFamilyMember
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_MortgagesMember
  24,996us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfbk_RealEstateMortgageResidentialSingleFamilyMember
/ us-gaap_ParticipatingMortgageLoansAxis
= us-gaap_MortgagesMember