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Fair Value (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2012
Fair Value [Abstract] |  |  |  |
Unpaid principal balance of impairment loan at collateral | $ 3,141 |  |  | $ 5,909
Valuation allowance | 1,149 |  |  | 611
Impaired loans partial charge offs | 306 |  |  |
Amount of charge-offs on loans |  | $ 536 | $ 1,802 |

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- Definition Impaired Financing Receivable Partial Charge Offs + References No definition available. + Details
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Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
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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
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Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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