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Foreclosed Assets - Expenses Related To Foreclosed Assets (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] |  |  |  |
Net loss (gain) on sale of foreclosed assets | $ (9) | $ (8) | $ (9) | $ (8)
Provision for unrealized losses | 780 |  | 962 | 1,139
Operating expenses, net of rental income | 5 | 8 | 29 | 54
Foreclosed assets, net | $ (776) |  | $ (982) | $ (1,185)

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- 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 Foreclosed Real Estate operating expense net of rental income. + References No definition available. + Details
Name: | cfbk_ForeclosedRealEstateOperatingExpenseNetOfRentalIncome
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net Gain Loss On Sale Of Foreclosed Assets + References No definition available. + Details
Name: | cfbk_NetGainLossOnSaleOfForeclosedAssets
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

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- Definition Amount of expense recognized during the period for the foreclosure on real estate assets. + References No definition available. + Details
Name: | us-gaap_ForeclosedRealEstateExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration