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Income Taxes (Details) (USD $)
0 Months Ended 12 Months Ended
Aug. 20, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]        
Proceeds from sale of common stock $ 22,500,000us-gaap_ProceedsFromIssuanceOfCommonStock     $ 20,221,000us-gaap_ProceedsFromIssuanceOfCommonStock
Net operating loss carry forwards   26,732,000us-gaap_OperatingLossCarryforwards    
Alternative minimum tax credit carryforwards   75,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 60,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Carryforwards utilize limit before the stock offering closed   163,000cfbk_OperatingLossCarryforwardsLimitationsOnUseAmount    
Unutilized operating loss carryforwards that will expire   20,520,000cfbk_DeferredTaxAssetsOperatingLossCarryforwardsThatWillExpireUnutilizedFederal    
Reduced deferred tax assets and valuation allowance   6,977,000us-gaap_OperatingLossCarryforwardsValuationAllowance    
Deferred tax liability to be recorded   765,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityPolicyholdersSurplus    
Effective income tax rate   34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Additional bad debt deductions provided by Federal income tax laws     2,250,000us-gaap_IncomeTaxReconciliationDeductionsOther  
Unrecognized Tax Benefits   $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits