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Contingent Liabilities (Details Textual) (USD $) In Thousands, unless otherwise specified	Jul. 25, 2012	Aug. 10, 2011
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

X

- 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