Securities (Fair Value Of Securities Pledged) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Pledged as collateral for:
FHLB advances	$ 2,293	$ 2,327
Public deposits	2,036	2,043
Interest-rate swaps	185	195
Total	$ 4,514	$ 4,565

Pledged assets separately reported securities pledged for interest rate swaps at fair value

No definition available.

Name:	cfbk_PledgedAssetsSeparatelyReportedSecuritiesPledgedForInterestRateSwapsAtFairValue
Namespace Prefix:	cfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Pledged assets separately reported securities pledged for public deposits, at fair value.

+ References

No definition available.

+ Details

Name:	cfbk_PledgedAssetsSeparatelyReportedSecuritiesPledgedForPublicDepositsAtFairValue
Namespace Prefix:	cfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

+ Details

Name:	us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValueByTypeOfAgreementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of the FHLB debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

+ Details

Name:	us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedForFederalHomeLoanBankAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant