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Foreclosed Assets (Expenses Related To Foreclosed Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Foreclosed Assets [Abstract] |  |
Net loss (gain) on sales |  | $ (12)
Operating expenses, net of rental income |  | 3
Foreclosed assets, net |  | $ (9)

X
- Definition Foreclosed Assets, Net + References No definition available. + Details
Name: | cfbk_ForeclosedAssetsNet
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_ForeclosedAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration