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Fair Value of Assets and Liabilities (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Impaired Loans [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	$ 180	$ 3,011
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	180	3,011
Mortgage Servicing Rights [Member]
Summary of fair value measurements of assets measured at fair value on a non-recurring basis
Assets, Fair value, Nonrecurring	6,575	2,585
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	$ 6,575	$ 2,585

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- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
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Period Type:	duration

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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

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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X

- Details

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