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Foreclosed Assets (Narrative) (Details) - property	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Multi-Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of properties		1
Single-Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Properties transferred into REO	1

X

- Definition

Number of properties.

+ References

No definition available.

+ Details

Name:	cfbk_NumberOfProperties
Namespace Prefix:	cfbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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_RealEstateMortgageResidentialMultiFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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