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Mortgage Servicing Rights (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Mortgage Servicing Rights [Line Items] |  |  |
Contractually specified servicing fees | $ 0.9 | $ 0.9 |
Mortgage-Backed Securities, Other [Member] |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
Unpaid principal balance of mortgage loans | $ 1,430.0 |  | $ 1,430.0

X
- Definition Contractually specified servicing fees . + References No definition available. + Details
Name: | sbfg_ContractuallySpecifiedServicingFees
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of unpaid principal balance of mortgage loans serviced for others. + References No definition available. + Details
Name: | sbfg_UnpaidPrincipalBalanceOfMortgageLoansServicedForOthers
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ParticipatingMortgageLoansLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_MortgageBackedSecuritiesOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |