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Loans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 loan	Dec. 31, 2013 loan
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 257,831,000us-gaap_LoansAndLeasesReceivableNetReportedAmount	$ 207,141,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
Loans 90 days or more past due and still accruing interest	0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Allocated specific reserves to modified TDRs	64,000cfbk_AllocatedSpecificReservesToModifiedTdrs	998,000cfbk_AllocatedSpecificReservesToModifiedTdrs
Total TDR's	5,700,000us-gaap_FinancingReceivableModificationsRecordedInvestment	6,100,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Accruing TDR's	5,250,000cfbk_TroubleDebtRestructuringAccrualFinancialReceivables	3,517,000cfbk_TroubleDebtRestructuringAccrualFinancialReceivables
Number of loans modified as a TDR	1us-gaap_FinancingReceivableModificationsNumberOfContracts2	4us-gaap_FinancingReceivableModificationsNumberOfContracts2
TDR's charge-offs	4,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	220,000us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Mortgage Purchase Program Member [Member]
Accounts Notes And Loans Receivable [Line Items]
Percent of participation agreement interest	80.00%cfbk_LoansParticipationAgreementPercentage / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember
Ownership interest in each loan is participates	20.00%cfbk_OwnershipInterestInEachLoan / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember
Aggregate purchase price of loans, maximum	25,000,000cfbk_LoansAquiredMaximumAggregateValue / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember
Percent of loans risk rated for capital adequacy	100.00%cfbk_PercentOfLoansHeldRiskRatedForCapitalAdequacy / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember
Northpointe Bank [Member] | Mortgage Purchase Program Member [Member]
Accounts Notes And Loans Receivable [Line Items]
Ownership interest in each loan is participates	5.00%cfbk_OwnershipInterestInEachLoan / dei_LegalEntityAxis = cfbk_NorthpointeBankMember / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember
Minimum [Member] | Northpointe Bank [Member]
Accounts Notes And Loans Receivable [Line Items]
Percent of participation agreement interest	80.00%cfbk_LoansParticipationAgreementPercentage / dei_LegalEntityAxis = cfbk_NorthpointeBankMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Northpointe Bank [Member]
Accounts Notes And Loans Receivable [Line Items]
Percent of participation agreement interest	95.00%cfbk_LoansParticipationAgreementPercentage / dei_LegalEntityAxis = cfbk_NorthpointeBankMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Other Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR's	20,719,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_OtherLoansMember	17,835,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_OtherLoansMember
Single-family residential [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR's	196,000us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_SingleFamilyResidentialRealEstateMember
Single-Family Residential[Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans modified as a TDR		1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Single-Family Residential[Member] | Mortgage Purchase Program Member [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 25,013,000us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember	$ 12,743,000us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember

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Number of financing receivables that have been modified by troubled debt restructurings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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