XML 55 R47.htm IDEA: XBRL DOCUMENT
v3.25.2

Securities - Schedule of Credit Ratings of HTM Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | $ 5,832 | $ 5,979
AAA |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 2,635 |
A- |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 500 |
BBB/BBB+ |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 1,247 |
BBB- |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 700 |
Not Rated |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 750 |
Corporate securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 3,197 | 3,196
Corporate securities | A- |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 500 |
Corporate securities | BBB/BBB+ |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 1,247 |
Corporate securities | BBB- |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 700 |
Corporate securities | Not Rated |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 750 |
Mortgage-backed Securities |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | 2,635 | $ 2,783
Mortgage-backed Securities | AAA |  |
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items] |  |
HTM Debt Securities | $ 2,635 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityCreditQualityIndicatorLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 + Details
Name: | us-gaap_HeldToMaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAAARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=bvfl_StandardAndPoorsBbbBbbPlusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsBBBMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=bvfl_StandardAndPoorsNotRatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |