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Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statements of Stockholders' Equity [Abstract]
Dividend common stock, Per share	$ 0.28	$ 0.24	$ 0.20
Dividend preferred stock, Per share	$ 0.65	$ 0.65	$ 0.64

X

- Definition

Dividend common stock per share amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Dividend preferred stock per share amount

+ References

No definition available.

+ Details

Name:	sbfg_Dividendpreferredstockpershareamount
Namespace Prefix:	sbfg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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