Debt instrument maximum borrowing capacity amount.

No definition available.

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

- Definition

Number Of PPP Loans Processed

+ References

No definition available.

+ Details

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Namespace Prefix:	cfbk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

PPPLF Fixed Rate

+ References

No definition available.

+ Details

Name:	cfbk_PpplfFixedRate
Namespace Prefix:	cfbk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Total Amount Of PPP Loans Processed

+ References

No definition available.

+ Details

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

- Definition

Weighted Average Life Of PPP Loans and PPPLF Funding

+ References

No definition available.

+ Details

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Namespace Prefix:	cfbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

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-Name Accounting Standards Codification
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

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- Details

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- Details

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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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- Details

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FHLB Advances And Other Debt (Narrative) (Details)		3 Months Ended		12 Months Ended
FHLB Advances And Other Debt (Narrative) (Details)	May 21, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) loan	May 20, 2021 USD ($)
Amount available of FHLB				$ 178,377,000
Third-Party Bank [Member] \| Term Loan [Member]
Loan						$ 5,000,000
Federal Reserve Bank Advances [Member]
Outstanding borrowings				0	$ 0
Debt instrument maximum borrowing capacity amount				72,195,000
Line Of Credit [Member] \| Commercial Bank One [Member]
Unused line of credit				50,000,000
Line Of Credit [Member] \| Commercial Bank Two [Member]
Unused line of credit				15,000,000
Line Of Credit [Member] \| Commercial Bank One And Two [Member]
Line of credit, outstanding balance				0	0
Revolving Credit Facility [Member] \| Third-Party Bank [Member]
Line of credit, borrowing capacity	$ 35,000,000					$ 10,000,000
Interest rate	3.85%
Line of credit, expiration date	May 21, 2024
Revolving Credit Facility [Member] \| Third-Party Bank [Member] \| Prime Rate [Member]
Variable rate spread	3.25%
Revolving Credit Facility [Member] \| Third-Party Bank [Member] \| Term Loan [Member]
Line of credit, outstanding balance				$ 24,277,000	$ 9,500,000
FRB PPPLF Advances [Member]
PPPLF fixed rate				0.35%
Weighted average life				2 months 12 days	1 year 2 months 12 days
Outstanding borrowings				$ 450,000	$ 107,413,000
Number of PPP loans processed \| loan					558
Total amount of PPP loans processed					$ 126,000,000
Warehouse Facility One [Member] \| Commercial Bank [Member]
Line of credit, borrowing capacity			$ 25,000,000
Line of credit, outstanding balance				$ 0
Warehouse Facility Two [Member] \| Commercial Bank [Member]
Line of credit, borrowing capacity		$ 75,000,000
Line of credit, outstanding balance					$ 0
Minimum [Member] \| Warehouse Facility One [Member] \| Commercial Bank [Member] \| London Interbank Offered Rate [Member]
Variable rate spread			2.00%
Minimum [Member] \| Warehouse Facility Two [Member] \| Commercial Bank [Member] \| London Interbank Offered Rate [Member]
Variable rate spread		2.35%
Maximum [Member] \| Warehouse Facility One [Member] \| Commercial Bank [Member] \| London Interbank Offered Rate [Member]
Variable rate spread			4.00%
Maximum [Member] \| Warehouse Facility Two [Member] \| Commercial Bank [Member] \| London Interbank Offered Rate [Member]
Variable rate spread		2.90%