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Loan Commitments And Other Related Activities (Contractual Amounts Of Financial Instruments With Off-Balance-Sheet Risk) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments To Make Loans [Member]
Other Contingencies And Commitments [Line Items]
Fixed Rate	$ 80,528	$ 15,856
Variable Rate	36,542	21,716
Unused Lines Of Credit [Member]
Other Contingencies And Commitments [Line Items]
Fixed Rate	6,218	8,068
Variable Rate	50,355	38,760
Standby Letters Of Credit [Member]
Other Contingencies And Commitments [Line Items]
Fixed Rate	$ 946	$ 1,115

X

- Definition

Contractual Amount Of Financial Instruments With Off Balance Sheet Risk At Fixed Rate

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Contractual Amount Of Financial Instruments With Off Balance Sheet Risk At Variable Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	cfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other Contingencies And Commitments [Line Items]

+ References

No definition available.

+ Details

Name:	cfbk_OtherContingenciesAndCommitmentsLineItems
Namespace Prefix:	cfbk_
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Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
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Balance Type:
Period Type: