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Foreclosed Assets (Expenses Related To Foreclosed Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Foreclosed Assets [Abstract] |  |
Net loss (gain) on sales | $ 7 | $ (4)
Operating expenses, net of rental income | 11 | 69
Foreclosed assets, net | $ 18 | $ 65

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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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- References No definition available. + Details
Name: | us-gaap_ForeclosedAssetsAbstract
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