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Loans and Allowance for Credit Losses (Details) - Schedule of Credit Losses for Unfunded Loan Commitments - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2023
Loans and Allowance for Credit Losses [Abstract] |  |
Balance, beginning of period | $ 856 |
Adjustment for adoption of ASU 2016-13 |  | 1,149
Provision for unfunded commitments | (6) | (299)
Balance, end of period | $ 850 | $ 850

X
- Definition The amount of adjustment for adoption. + References No definition available. + Details
Name: | sbfg_AdjustmentForAdoptionOfASU201613
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References No definition available. + Details
Name: | sbfg_FinancingReceivableAllowanceForCreditLosse
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | sbfg_LoansandAllowanceforCreditLossesDetailsScheduleofCreditLossesforUnfundedLoanCommitmentsLineItems
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Provision for unfunded commitments. + References No definition available. + Details
Name: | sbfg_ProvisionForUnfundedCommitments
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration