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Securities - Schedule of Investment Securities with Unrealized Loss (Parenthetical) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Fair value amount of allowance for credit loss reserve	$ 3,000	$ 4,000

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- Definition

Fair value amount of allowance for credit losses reserve.

+ References

No definition available.

+ Details

Name:	bvfl_FairValueAmountOfAllowanceForCreditLossesReserve
Namespace Prefix:	bvfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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