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Foreclosed Assets (Expenses Related To Foreclosed Assets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure Foreclosed Assets Expenses Related To Foreclosed Assets [Abstract] |  |  |
Net loss (gain) on sales |  | $ (28)cfbk_NetGainLossOnSaleOfForeclosedAssets | $ (338)cfbk_NetGainLossOnSaleOfForeclosedAssets
Provision for unrealized losses |  |  | 962 cfbk_AdditionsChargedToExpenseInValuationAllowance
Operating expenses, net of rental income | 328 cfbk_ForeclosedRealEstateOperatingExpenseNetOfRentalIncome | 73 cfbk_ForeclosedRealEstateOperatingExpenseNetOfRentalIncome | 28 cfbk_ForeclosedRealEstateOperatingExpenseNetOfRentalIncome
Foreclosed assets, net | $ 328 us-gaap_ForeclosedRealEstateExpense | $ 45 us-gaap_ForeclosedRealEstateExpense | $ 652 us-gaap_ForeclosedRealEstateExpense

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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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- Details
Name: | cfbk_DisclosureForeclosedAssetsExpensesRelatedToForeclosedAssetsAbstract
Namespace Prefix: | cfbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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- 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