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Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Impaired loans [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring | $ 639 | $ 3,544
Mortgage servicing rights [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring | 10,678 | 7,759
Fair Value, Inputs, Level 1 [Member] | Impaired loans [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring |  |
Fair Value, Inputs, Level 1 [Member] | Mortgage servicing rights [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring |  |
Fair Value, Inputs, Level 2 [Member] | Impaired loans [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring |  |
Fair Value, Inputs, Level 2 [Member] | Mortgage servicing rights [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring |  |
Fair Value, Inputs, Level 3 [Member] | Impaired loans [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring | 639 | 3,544
Fair Value, Inputs, Level 3 [Member] | Mortgage servicing rights [Member] |  |
Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items] |  |
Assets, fair value, nonrecurring | $ 10,678 | $ 7,759

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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
Name: | sbfg_AssetFairValueDisclosureNonrecurring
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=sbfg_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=sbfg_MortgageServicingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |