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Securities (Narrative) (Details) (Issued by U.S. Government-Sponsored Entities and Agencies [Member]) | Jun. 30, 2013 | Dec. 31, 2012
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Issued by U.S. Government-Sponsored Entities and Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Minimum percentage of securities hold | 10.00% | 10.00%

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- Definition Minimum percentage of securities hold. + References No definition available. + Details
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Namespace Prefix: | cfbk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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