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Loan Commitments and Other Related Activities (Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments To Make Loans [Member]    
Other Contingencies And Commitments [Line Items]    
Fixed Rate $ 14,992cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember		 $ 8,169cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember
Variable Rate 17,339cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember		 11,569cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember
Unused Lines Of Credit [Member]    
Other Contingencies And Commitments [Line Items]    
Fixed Rate 189cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember		 47cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtFixedRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
Variable Rate $ 26,955cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember		 $ 22,993cfbk_ContractualAmountOfFinancialInstrumentsWithOffBalanceSheetRiskAtVariableRate
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember