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v3.19.2

Restriction on Cash and Due from Banks (Details) $ in Thousands | Jun. 30, 2019 USD ($)
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Restriction on Cash and Due from Banks [Abstract] |
Reserve funds to be maintained with Federal Reserve Bank | $ 15,600

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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