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Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative Financial Instruments (Textual)
Notional amount of customer-facing swaps	$ 49.9	$ 39.3

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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