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Foreclosed Assets - Activity In Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning valuation allowance | $ 1,139 | $ 1,139 | $ 1,139 |
Additions charged to expense | 780 |  | 962 | 1,139
Direct write-downs | (1,919) |  | (2,101) |
Ending valuation allowance | $ 0 | $ 1,139 | $ 0 | $ 1,139

X
- Definition Additions charged to expense in valuation allowance. + References No definition available. + Details
Name: | cfbk_AdditionsChargedToExpenseInValuationAllowance
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Direct write downs to valuation allowance. + References No definition available. + Details
Name: | cfbk_DirectWriteDownsToValuationAllowance
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Valuation Allowance On Foreclosed Asset Beginning Balance + References No definition available. + Details
Name: | cfbk_ValuationAllowanceOnForeclosedAssetBeginningBalance
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Valuation Allowance On Foreclosed Asset Ending Balance + References No definition available. + Details
Name: | cfbk_ValuationAllowanceOnForeclosedAssetEndingBalance
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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