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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2015
Jul. 01, 2014
Jul. 01, 2013
Life Insurance Benefits [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Benefit plan expense $ 12us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedBenefitPostretirementLifeInsuranceMember
$ (1)us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedBenefitPostretirementLifeInsuranceMember
$ 16us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedBenefitPostretirementLifeInsuranceMember
             
Accrued interest payable and other liabilities Total 216us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedBenefitPostretirementLifeInsuranceMember
204us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= us-gaap_DefinedBenefitPostretirementLifeInsuranceMember
               
401 (k) plan [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Percentage of amount allowable under federal tax regulations 25.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_FourZeroOneKPlanMember
                 
Percentage of compensation contributed under federal tax regulations 8.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_FourZeroOneKPlanMember
                 
Benefit plan expense 28us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_FourZeroOneKPlanMember
27us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_FourZeroOneKPlanMember
33us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_FourZeroOneKPlanMember
             
Salary Continuation Agreement [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Benefit plan expense 12us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_SalaryContinuationPlanMember
12us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_SalaryContinuationPlanMember
47us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_SalaryContinuationPlanMember
             
Accrued interest payable and other liabilities Total 247us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_SalaryContinuationPlanMember
260us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_SalaryContinuationPlanMember
               
Annual benefit for 20 years 25cfbk_DefinedBenefitPlanAnnualCostOrChange
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cfbk_SalaryContinuationPlanMember
                 
Duration of Annual benefit 20 years                  
Multi-employer pension plan [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Unfunded liability       192cfbk_DefinedBenefitPlanUnfundedLiability
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
35cfbk_DefinedBenefitPlanUnfundedLiability
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
192cfbk_DefinedBenefitPlanUnfundedLiability
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
       
CFBank's contributions       49us-gaap_PensionAndOtherPostretirementBenefitContributions
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
80us-gaap_PensionAndOtherPostretirementBenefitContributions
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
         
Funded status                 96.51%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
82.95%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
Total contributions made to Pentegra DB Plan           136,478us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
196,473us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
     
Percentage of amount allowable under federal tax regulations           5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
     
Multi-employer pension plan [Member] | Scenario, Forecast [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
CFBank's contributions               $ 64us-gaap_PensionAndOtherPostretirementBenefitContributions
/ us-gaap_MultiemployerPlanTypeAxis
= us-gaap_MultiemployerPlansPensionMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember