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Other Borrowings (Assets Pledged As Collateral With FRB) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Assets pledged as collateral with the FRB | $ 56,586,000.00 us-gaap_LoansPledgedAsCollateral | $ 48,312,000.00 us-gaap_LoansPledgedAsCollateral
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Assets pledged as collateral with the FRB | 18,111,000 us-gaap_LoansPledgedAsCollateral / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 19,591,000 us-gaap_LoansPledgedAsCollateral / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Real Estate, Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Assets pledged as collateral with the FRB | $ 38,475,000 us-gaap_LoansPledgedAsCollateral / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialMember | $ 28,721,000 us-gaap_LoansPledgedAsCollateral / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cfbk_RealEstateCommercialMember

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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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