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Disclosures about Fair Value of Assets and Liabilities (Details) | 12 Months Ended
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Dec. 31, 2024
Disclosures about Fair Value of Assets and Liabilities [Abstract] |
Fair Value Maturity Period | 90 days

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- Definition Fair value maturity period. + References No definition available. + Details
Name: | sbfg_FairValueMaturityPeriod
Namespace Prefix: | sbfg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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