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Foreclosed Assets (Expenses Related To Foreclosed Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Foreclosed Assets [Abstract]
Net loss (gain) on sales	$ (4)
Operating expenses, net of rental income	69	137
Foreclosed assets, net	$ 65	$ 137

X

- Definition

Foreclosed Real Estate operating expense net of rental income.

+ References

No definition available.

+ Details

Name:	cfbk_ForeclosedRealEstateOperatingExpenseNetOfRentalIncome
Namespace Prefix:	cfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Net Gain Loss On Sale Of Foreclosed Assets

+ References

No definition available.

+ Details

Name:	cfbk_NetGainLossOnSaleOfForeclosedAssets
Namespace Prefix:	cfbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of expense recognized during the period for the foreclosure on real estate assets.

+ References

No definition available.

+ Details

Name:	us-gaap_ForeclosedRealEstateExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration