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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Income Taxes [Abstract]      
Proceeds from sale of common stock     $ 22,500,000us-gaap_ProceedsFromIssuanceOfCommonStock
Net operating loss carry forwards   26,732,000us-gaap_OperatingLossCarryforwards  
Alternative minimum tax credit carryforwards   75,000us-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  
Effective income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Additional bad debt deductions provided by Federal income tax laws   2,250,000us-gaap_IncomeTaxReconciliationDeductionsOther  
Deferred tax liability not recorded   765,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityPolicyholdersSurplus  
Unrecognized Tax Benefits $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits