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Loans And Leases (Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total | $ 115 | $ 144
Commercial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual Troubled Debt Restructurings, Total | $ 115 | $ 144

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- Definition Financing Receivable Recorded Investment Nonaccrual Trouble Debt Restructured + References No definition available. + Details
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Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |