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Regulatory Matters (Details)	12 Months Ended
	Dec. 31, 2023
Regulatory Matters [Abstract]
Minimum conservation buffer	2.50%

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- Definition

Capital conservation buffer percentage.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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