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Disclosures About Fair Value of Assets and Liabilities, Quantitative Information (Details) - Nonrecurring Basis [Member] $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract]
Collateral-dependent impaired loans	$ 37,501	$ 6,553
Level 3 [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract]
Collateral-dependent impaired loans	$ 37,501	$ 6,553
Level 3 [Member] | Appraisals from Comparable Assets [Member] | Estimated Cost to Sell [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract]
Collateral-dependent impaired loans, measurement input	0.20	0.20

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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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- Definition

Value of input used to measure collateral-dependent impaired loans.

+ References

No definition available.

+ Details

Name:	bsvn_ImpairedLoansMeasurementInput
Namespace Prefix:	bsvn_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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

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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_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=bsvn_AppraisalsFromComparableAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCostToSellMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: