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Deposits (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Statistical Disclosure for Banks [Abstract] |  |
Time deposits | $ 52.5 | $ 55.6

X
- Definition Amount of time deposit liabilities, including certificates of deposit. + References No definition available. + Details
Name: | sbfg_TimeDeposit
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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