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Operating Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Rental Expense [Abstract] |  |  |
Rental expense | $ 1,068 | $ 1,001 | $ 777
Operating lease right of use asset | $ 1,700 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Interest receivable and other assets |  |
Weighted-average remaining lease term | 15 years 9 months 18 days |  |
Weighted-average discount rate | 3.70% |  |
Future Minimum Rental Commitments Due under Non-Cancelable Operating Leases [Abstract] |  |  |
2024 | $ 646 |  |
2025 | 305 |  |
2026 | 211 |  |
2027 | 118 |  |
2028 | 118 |  |
Thereafter | 774 |  |
Total lease payments | 2,172 |  |
Less imputed interest | (298) |  |
Operating lease liability | $ 1,874 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | bsvn:InterestPayableAndOtherLiabilitiesMember |  |

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