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Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Impaired loans [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	$ 639	$ 3,544
Mortgage servicing rights [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	10,678	7,759
Fair Value, Inputs, Level 1 [Member] | Impaired loans [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 1 [Member] | Mortgage servicing rights [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 2 [Member] | Impaired loans [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 2 [Member] | Mortgage servicing rights [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 3 [Member] | Impaired loans [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	639	3,544
Fair Value, Inputs, Level 3 [Member] | Mortgage servicing rights [Member]
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	$ 10,678	$ 7,759

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=sbfg_MortgageServicingRightsMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
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Data Type:	na
Balance Type:
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X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
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