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Restriction on Cash and Due from Banks (Details) $ in Millions	Jun. 30, 2021 USD ($)
Restriction on Cash and Due from Banks [Abstract]
Reserve funds to be maintained with Federal Reserve Bank	$ 0

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- Definition

Amount of reserve funds to be maintained in the form of cash or on deposit with the Federal Reserve Bank.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	bsvn_RestrictionOnCashAndDueFromBanksAbstract
Namespace Prefix:	bsvn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration