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Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of recurring fair value measurements consolidated balance sheets - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of recurring fair value measurements consolidated balance sheets [Abstract]
Balance at beginning of period	$ (155)	$ (414)	$ 22	$ 278
Change in fair value	209	534	32	(158)
Balance at end of period	$ 54	$ 120	$ 54	$ 120

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- References

No definition available.

+ Details

Name:	sbfg_FairMarketValue
Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	sbfg_ScheduleOfRecurringFairValueMeasurementsConsolidatedBalanceSheetsAbstract
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

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration