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Fair Value (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value [Abstract] |  |
Unpaid principal balance of impairment loan at collateral | $ 3,337 | $ 3,465
Valuation allowance | $ 886 | $ 985

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- Definition Mortgage servicing rights (MSR) valuation allowances. + References No definition available. + Details
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Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unpaid principal balance of impaired loans carried at fair value of collateral. + References No definition available. + Details
Name: | cfbk_UnpaidPrincipalBalanceOfImpairedLoansCarriedAtFairValueOfCollateral
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration