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Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable (Level 3) Inputs - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest rate lock commitments
Balance at beginning of period	$ 45	$ (155)	$ (20)	$ 22
Balance at end of period	(10)	54	(10)	54
Change in fair value	$ (55)	$ 209	$ 10	$ 32

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- Definition

AssetsFairValueDisclosures.

+ References

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Namespace Prefix:	sbfg_
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Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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