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Subordinated Debentures (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Sep. 30, 2012
Dec. 31, 2008
Dec. 31, 2003
Subsidiary, Sale of Stock [Line Items]              
Subordinated debentures $ 5,155,000us-gaap_SubordinatedDebt $ 5,155,000us-gaap_SubordinatedDebt         $ 5,155,000us-gaap_SubordinatedDebt
Holding Company's investment in the common stock   155,000us-gaap_CommonStockHeldInTrust          
Holding Company may redeem the subordinated debentures in a principal amount with integral multiples           $ 1cfbk_MultipleOfAmountForRedemptionOfSubordinateDebentures  
Percentage in which holding company redeem subordinated debentures           100.00%cfbk_PercentageOfPrincipalAmountOfSubordinatedDebentures  
Maturity date of subordinated debentures Dec. 30, 2033            
Cumulative deferred interest payments 0cfbk_CumulativeDeferredInterestPayments 210,000cfbk_CumulativeDeferredInterestPayments   293,000cfbk_CumulativeDeferredInterestPayments 348,000cfbk_CumulativeDeferredInterestPayments    
Current interest paid $ 2,097,000us-gaap_InterestPaid $ 1,956,000us-gaap_InterestPaid $ 2,835,000us-gaap_InterestPaid        
Trust preferred securities and subordinated debentures have a variable rate of interest 2.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1            
Trust preferred securities and subordinated debentures have a stated percentage 3.11%us-gaap_DebtInstrumentInterestRateEffectivePercentage 3.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage          
Private Placement [Member]              
Subsidiary, Sale of Stock [Line Items]              
Holding Company, closed a pooled private offering             5,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Trust preferred securities with a liquidation amount             $ 1us-gaap_PreferredStockLiquidationPreference
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Subordinated [Member]              
Subsidiary, Sale of Stock [Line Items]              
Number of years with no principal repayment 5 years            
Maximum number of years for deferred interest payments 5 years