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Fair Value Disclosure - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Individually Evaluated Loans	$ 6,000	$ 5,600	$ 0
Impaired financing receivable, valuation allowance	$ 220	$ 398

X

- Definition

Impaired Financing Receivable, Valuation Allowance

+ References

No definition available.

+ Details

Name:	cbfv_ImpairedFinancingReceivableValuationAllowance
Namespace Prefix:	cbfv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value portion of impaired loans.

+ References

No definition available.

+ Details

Name:	cbfv_ImpairedLoansFairValue
Namespace Prefix:	cbfv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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