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Disclosures about Fair Value of Assets and Liabilities, Recurring and Nonrecurring Basis (Details) - Nonrecurring Basis [Member] - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Asset measured at fair value on nonrecurring basis [Abstract] |  |
Impaired loans (collateral-dependent) | $ 16,370 | $ 6,553
Asset retirement obligations | 361 |
Level 1 [Member] |  |
Asset measured at fair value on nonrecurring basis [Abstract] |  |
Impaired loans (collateral-dependent) | 0 | 0
Asset retirement obligations | 0 |
Level 2 [Member] |  |
Asset measured at fair value on nonrecurring basis [Abstract] |  |
Impaired loans (collateral-dependent) | 0 | 0
Asset retirement obligations | 0 |
Level 3 [Member] |  |
Asset measured at fair value on nonrecurring basis [Abstract] |  |
Impaired loans (collateral-dependent) | 16,370 | $ 6,553
Asset retirement obligations | $ 361 |

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- Definition This element represents the fair value disclosure of asset retirement obligations relate to the obligation for the plugging and abandonment of oil and natural gas properties. + References No definition available. + Details
Name: | bsvn_AssetRetirementObligationFairValueDisclosure
Namespace Prefix: | bsvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition This element represents the fair value disclosure of collateral-dependent impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. + References No definition available. + Details
Name: | bsvn_ImpairedLoansFairValueDisclosure
Namespace Prefix: | bsvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |