FHLB Advances And Other Debt (FHLB Advances And Other Debt Outstanding Maturity Period) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
FHLB Advances And Other Debt [Abstract]
2019	$ 12,517
2020	4,500
2021	5,500
2022
2023	6,500
Total	$ 29,017	$ 19,500

Advances From Federal Home Loan Banks And Other Debt

No definition available.

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

Federal Home Loan Bank Advances And Other Debt Maturities Summary, Due In Next Twelve Months

No definition available.

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

Federal Home Loan Bank Advances And Other Debt Maturities Summary, Due In Year Five

No definition available.

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

Federal Home Loan Bank Advances And Other Debt Maturities Summary, Due In Year Four

No definition available.

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

Federal Home Loan Bank Advances And Other Debt Maturities Summary, Due In Year Three

No definition available.

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

Federal Home Loan Bank Advances And Other Debt Maturities Summary, Due In Year Two

No definition available.

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

No definition available.

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