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Loans and Allowance for Loan Losses (Details 5) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Contracts
Financing Receivable, Impaired [Line Items]
Number of Contracts | Contracts	2
Total Modifications | $	$ 220
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Number of Contracts | Contracts	1
Total Modifications | $	$ 61
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Number of Contracts | Contracts	1
Total Modifications | $	$ 159

X

- Definition

Financing receivable total modification (combination, term,interest).

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Financing receivable number of Contracts.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: