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Income Taxes (Effective Tax Rates Differ from Federal Statutory Rate) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Federal statutory rate times financial statement income (loss) $ 163us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (312)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (1,280)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Incentive Stock Options 75us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 47us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 3us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Bank owned life insurance income (44)cfbk_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome (44)cfbk_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome (45)cfbk_IncomeTaxReconciliationBankOwnedLifeInsuranceIncome
Increase in deferred tax valuation allowance (201)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 303us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 1,314us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other 7us-gaap_IncomeTaxReconciliationOtherAdjustments 6us-gaap_IncomeTaxReconciliationOtherAdjustments 8us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax (expense) benefit         
Effective tax rate 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations