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

X

- 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