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v3.20.1

Loans And Leases (Schedule Of Debtor Troubled Debt Restructuring, Subsequent Periods) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual TDRs, Total | $ 85 | $ 100
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Nonaccrual TDRs, Total | $ 85 | $ 100

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- Definition Financing Receivable Recorded Investment Nonaccrual Trouble Debt Restructured + References No definition available. + Details
Name: | cfbk_FinancingReceivableRecordedInvestmentNonaccrualTroubleDebtRestructured
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
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |