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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 | $ 257,831,000 us-gaap_LoansAndLeasesReceivableNetReportedAmount | $ 207,141,000 us-gaap_LoansAndLeasesReceivableNetReportedAmount
Loans 90 days or more past due and still accruing interest | 0 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing |
Allocated specific reserves to modified TDRs | 64,000 cfbk_AllocatedSpecificReservesToModifiedTdrs | 998,000 cfbk_AllocatedSpecificReservesToModifiedTdrs
Total TDR's | 5,700,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | 6,100,000 us-gaap_FinancingReceivableModificationsRecordedInvestment
Accruing TDR's | 5,250,000 cfbk_TroubleDebtRestructuringAccrualFinancialReceivables | 3,517,000 cfbk_TroubleDebtRestructuringAccrualFinancialReceivables
Number of loans modified as a TDR | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2
TDR's charge-offs | 4,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown | 220,000 us-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 | 25,000,000 cfbk_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 | 20,719,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_OtherLoansMember | 17,835,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_OtherLoansMember
Single-family residential [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total TDR's | 196,000 us-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 |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember
Single-Family Residential[Member] | Mortgage Purchase Program Member [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans | $ 25,013,000 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember | $ 12,743,000 us-gaap_LoansAndLeasesReceivableNetReportedAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateMortgageResidentialSingleFamilyMember / us-gaap_ParticipatingMortgageLoansAxis = us-gaap_MortgagesMember

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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