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Fair Value Disclosure - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
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Fair Value Disclosures [Abstract] |  |  |
Individually Evaluated Loans | $ 5,600 | $ 5,600 | $ 0
Impaired financing receivable, valuation allowance | $ 70 | $ 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration