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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |
Dividend common stock, per share amount | $ 0.055 | $ 0.045
Dividend preferred stock, per share amount | $ 0.1625 | $ 0.15

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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