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Earnings Per Share (Details) | Jan. 10, 2022 $ / shares
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Earnings Per Share [Abstract] |
Common stock dividend payable, percentage | 5.00%
Closing price per share | $ 19.89

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- Definition The percentage rate used to calculate dividend payments on common stock. + References No definition available. + Details
Name: | sbfg_CommonStockDividendRatePercentage
Namespace Prefix: | sbfg_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant