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Subordinated Debentures (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2008
Dec. 31, 2003
Subsidiary, Sale of Stock [Line Items]            
Subordinated debentures $ 5,155us-gaap_SubordinatedDebt $ 5,155us-gaap_SubordinatedDebt        
Holding Company's investment in the common stock       155us-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  
Cumulative deferred interest payments     $ 293cfbk_CumulativeDeferredInterestPayments      
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 3.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage 3.11%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 Debt [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