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Loans and Allowance for Loan Losses (Details 5) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Loan	Mar. 31, 2015 USD ($) Loan
Summary of newly restructured loans by type of modification
Pre-Modification Recorded Balance	$ 222	$ 24
Post-Modification Recorded Balance	$ 222	$ 24
Number of Loans | Loan	1	1
Interest Only
Term	$ 222	$ 24
Combination
Total Modification	$ 222	$ 24
Residential Real Estate [Member]
Summary of newly restructured loans by type of modification
Pre-Modification Recorded Balance		24
Post-Modification Recorded Balance		$ 24
Number of Loans | Loan		1
Interest Only
Term		$ 24
Combination
Total Modification		$ 24
Commercial [Member]
Summary of newly restructured loans by type of modification
Pre-Modification Recorded Balance
Post-Modification Recorded Balance
Number of Loans | Loan
Interest Only
Term
Combination
Total Modification
Consumer & Other [Member]
Summary of newly restructured loans by type of modification
Pre-Modification Recorded Balance	$ 222
Post-Modification Recorded Balance	$ 222
Number of Loans | Loan	1
Interest Only
Term	$ 222
Combination
Total Modification	$ 222

X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Financing receivable modification combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Financing receivable modification interest.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Financing Receivable Modification Number of Loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
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- Definition

Financing receivable modification term.

+ References

No definition available.

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

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- Definition

Financing Receivable Troubled Debt Restructurings.

+ References

No definition available.

+ Details

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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