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Fair Value of Assets and Liabilities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Impaired loans [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 530	$ 1,027
Impaired loans [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Impaired loans [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	530	1,027
Mortgage Servicing Rights [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	5,311	3,191
Mortgage Servicing Rights [Member] | Level 1 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 2 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring
Mortgage Servicing Rights [Member] | Level 3 [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 5,311	$ 3,191

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

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- Definition

Fair value measurements of assets measured at fair value on a non recurring basis.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_BalanceSheetLocationAxis=sbfg_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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