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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares | 9 Months Ended
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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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Namespace Prefix: | sbfg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Dividend preferred 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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration