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Loans and Allowance for Loan Losses (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Loans and Allowance for Loan Losses (Textual)
Principal amount outstanding of loans held-in-portfolio	$ 100
Impaired loans which included in groups of homogenous loans	Impaired loans less than $100,000 are included in groups of homogenous loans.

X

- Definition

Impaired loans which included in groups of homogenous loans.

+ References

No definition available.

+ Details

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X

- Definition

Loans and Allowance for Loan Losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	xbrli:stringItemType
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X

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

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