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Disclosures About Fair Value of Assets and Liabilities, Recurring and Nonrecurring Basis (Details) - Nonrecurring Basis [Member] - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Asset measured at fair value on nonrecurring basis [Abstract]
Collateral-dependent loans	$ 402	$ 3,209
Asset retirement obligations	296	292
Level 1 [Member]
Asset measured at fair value on nonrecurring basis [Abstract]
Collateral-dependent loans	0	0
Asset retirement obligations	0	0
Level 2 [Member]
Asset measured at fair value on nonrecurring basis [Abstract]
Collateral-dependent loans	0	0
Asset retirement obligations	0	0
Level 3 [Member]
Asset measured at fair value on nonrecurring basis [Abstract]
Collateral-dependent loans	402	3,209
Asset retirement obligations	$ 296	$ 292

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- Definition

This element represents the fair value disclosure of asset retirement obligations relate to the obligations for the plugging and abandonment of oil and natural gas properties.

+ References

No definition available.

+ Details

Name:	bsvn_AssetRetirementObligationsFairValueDisclosure
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:

X

- Details

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

X

- 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: