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Disclosures about Fair Value of Assets and Liabilities (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Impaired loans [Member] | Level 1 [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring |  |
Impaired loans [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring | 1,027 | 982
Impaired loans [Member] | Level 2 [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring |  |
Impaired loans [Member] | Level 3 [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring | 1,027 | 982
Mortgage servicing rights [Member] | Level 1 [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring |  |
Mortgage servicing rights [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring | 3,191 | 1,490
Mortgage servicing rights [Member] | Level 2 [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring |  |
Mortgage servicing rights [Member] | Level 3 [Member] |  |
Fair value measurements of assets measured at fair value on a non-recurring basis |  |
Assets, fair value, nonrecurring | $ 3,191 | $ 1,490

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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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- Definition Fair value measurements of assets measured at fair value on a non recurring basis. + References No definition available. + Details
Name: | sbfg_FairValueMeasurementsOfAssetsMeasuredAtFairValueOnNonRecurringBasisAbstract
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_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: |

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