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Loans and Allowance for Credit Losses - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) class	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Receivables [Abstract]
Real estate loan classes | class			3
Net unamortized loan fees	$ 962		$ 962		$ 846
Financing receivable, nonaccrual, interest income	29	$ 21	81	$ 40
Mortgage loans in process of foreclosure, amount	530		530		1,200
Individually Evaluated Loans	5,600	$ 0	5,600	$ 0	5,600
Impaired financing receivable, valuation allowance	$ 70		$ 70		$ 398

X

- Definition

Impaired Financing Receivable, Valuation Allowance

+ References

No definition available.

+ Details

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Namespace Prefix:	cbfv_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value portion of impaired loans.

+ References

No definition available.

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X

- Definition

Number of Real Estate Loan Classes

+ References

No definition available.

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Namespace Prefix:	cbfv_
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Balance Type:	na
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X

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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Period Type:	duration

X

- Definition

Amount of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481598/310-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-SubTopic 20
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481569/310-20-50-3

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Balance Type:	debit
Period Type:	instant

X

- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 35
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-35

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Balance Type:	debit
Period Type:	instant

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- References

No definition available.

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