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v3.23.2

Earnings Per Share (Details) - $ / shares |  | 1 Months Ended
--- | --- | ---
Jan. 10, 2022 | Jan. 25, 2022
Earnings Per Share [Line Items] |  |
Common stock dividend payable, percentage | 5.00% | 5.00%
Closing price per share | $ 19.89 |
Minimum [Member] |  |
Earnings Per Share [Line Items] |  |
Common stock, shares authorized |  | 10,000,000
Maximum [Member] |  |
Earnings Per Share [Line Items] |  |
Common stock, shares authorized |  | 10,500,000

X
- 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

X
- References No definition available. + Details
Name: | sbfg_EarningsPerShareLineItems
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum number of excess stock shares permitted to be issued. + References No definition available. + Details
Name: | us-gaap_ExcessStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |