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Disclosures about Fair Value of Assets and Liabilities, Quantitative Information (Details) - Nonrecurring Basis [Member] $ in Thousands	Dec. 31, 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	$ 16,370	$ 6,553
Asset retirement obligations	361
Level 3 [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract]
Collateral-dependent impaired loans	16,370	$ 6,553
Asset retirement obligations	$ 361
Level 3 [Member] | Estimated Cash to be Received Pending Resolution of Bankruptcy Proceedings [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
Level 3 [Member] | Expected Present Value [Member] | Plugging and Abandonment Expense [Member]
Quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements [Abstract]
Asset retirement obligations, measurement input	0
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

X

- 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

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Namespace Prefix:	bsvn_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Value of input used to measure asset retirement obligation.

+ References

No definition available.

+ Details

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

X

- 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

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Namespace Prefix:	bsvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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