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Disclosures about Fair Value of Assets and Liabilities (Details)	12 Months Ended
	Dec. 31, 2023
Disclosures about Fair Value of Assets and Liabilities [Abstract]
Decrease in constant prepayment rate	3.42%
Maturity period	90 days

X

- Definition

Percentage of decrease in constant prepayment.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

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

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration