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Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Impaired loans [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring | $ 1,058 | $ 1,028
Mortgage servicing rights [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring | 1,349 | 1,448
Level 1 [Member] | Impaired loans [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring |  |
Level 1 [Member] | Mortgage servicing rights [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring |  |
Level 2 [Member] | Impaired loans [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring |  |
Level 2 [Member] | Mortgage servicing rights [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring |  |
Level 3 [Member] | Impaired loans [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring | 1,058 | 1,028
Level 3 [Member] | Mortgage servicing rights [Member] |  |
Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable Level3 Inputs [Abstract] |  |
Assets, fair value, nonrecurring | $ 1,349 | $ 1,448

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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