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v3.20.1

Foreclosed Assets (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 property
Single-Family Residential [Member] |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Number of properties transferred into REO | 1

X
- Definition Number Of Properties Transferred Into Real Estate Owned + References No definition available. + Details
Name: | cfbk_NumberOfPropertiesTransferredIntoRealEstateOwned
Namespace Prefix: | cfbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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