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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividend common stock, per share amount	$ 0.065	$ 0.055
Dividend preferred stock, per share amount	$ 0.1625	$ 0.1625

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- Definition

Dividend common stock per share amount.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- 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