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Derivative Instruments (Schedule Of Notional Amount Of Loans Sold) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments [Abstract] |  |
Notional amount of loans sold | $ 2,229,042 | $ 411,257

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Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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