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Loans and Allowance for Credit Losses (Details) - Schedule of credit losses for unfunded loan commitments - Allowance for Credit Losses - Unfunded Commitments [Member] $ in Thousands | 3 Months Ended
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Mar. 31, 2023 USD ($)
Loans and Allowance for Credit Losses (Details) - Schedule of credit losses for unfunded loan commitments [Line Items] |
Balance, beginning of period |
Adjustment for adoption of ASU 2016-13 | 1,149
Provision for unfunded commitments | (63)
Balance, end of period | $ 1,086

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- 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

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- 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

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

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- 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

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- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=sbfg_AllowanceForCreditLossesUnfundedCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |