Subsequent Events (Details) - USD ($) $ in Millions		3 Months Ended
Oct. 19, 2023	Sep. 30, 2023
Subsequent Event [Abstract]
Finance receivable, provision for credit losses		$ 3.0
Subsequent Event [Member]
Subsequent Event [Abstract]
Estimated purchase price	$ 16.0

Amount of credit loss expense (reversal of expense) for financing receivable for loan customers that filed for bankruptcy.

No definition available.

Name:	bsvn_FinancingReceivableCreditLossExpenseReversalForLoanCustomerThatFiledForBankruptcy
Namespace Prefix:	bsvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration