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Contingent Liabilities (Details Textual) (USD $) In Thousands, unless otherwise specified | Jul. 25, 2012 | Aug. 10, 2011
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Contingent Liabilities (Textual) [Abstract] |  |
Cost of annuitization of benefits |  | $ 579
Cost of obtaining the letter of credit |  | 1
Letters of Credit Outstanding, Amount | $ 908 |

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- Details
Name: | cfbk_ContingentLiabilitiesTextualAbstract
Namespace Prefix: | cfbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Cost of annuitization of benefits. + References No definition available. + Details
Name: | cfbk_CostOfAnnuitizationOfBenefits
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cost of obtaining the letter of credit. + References No definition available. + Details
Name: | cfbk_CostOfObtainingLetterOfCredit
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant