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Contingent Liabilities - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | Aug. 17, 2012
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Contingent Liabilities [Abstract] |
Cost of annuitization of benefits | $ 908
Cost of obtaining the letter of credit | $ 9

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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

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