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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Statement of Cash Flows [Abstract] |  |
Interest credit to deposit accounts | $ 12,605 | $ 12,070

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- Definition The amount of cash paid for interest credited to deposit accounts during the period. + References No definition available. + Details
Name: | cbfv_InterestExpenseAndAccruedInterestOnDepositAccounts
Namespace Prefix: | cbfv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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