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Disclosures about Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | $ 18,670 | $ 12,708
Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | 60,943 | 56,762
State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | 11,356 | 13,250
Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  | 70
Level 1 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 1 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 1 [Member] | State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 1 [Member] | Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 1 [Member] | Interest rate contracts - assets [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 1 [Member] | Interest rate contracts - liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 2 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | 18,670 | 12,708
Level 2 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | 60,943 | 56,762
Level 2 [Member] | State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | 11,356 | 13,250
Level 2 [Member] | Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  | 70
Level 2 [Member] | Interest rate contracts - assets [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring | 687 | 698
Level 2 [Member] | Interest rate contracts - liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Liabilities, fair value, recurring | (687) | (698)
Level 3 [Member] | U.S. Treasury and Government agencies [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 3 [Member] | Mortgage-backed securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 3 [Member] | State and political subdivisions [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 3 [Member] | Equity securities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 3 [Member] | Interest rate contracts - assets [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |
Level 3 [Member] | Interest rate contracts - liabilities [Member] |  |
Fair value measurements of securities measured at fair value on a recurring basis |  |
Assets, fair value, recurring |  |

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring 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

X
- Definition Fair value measurements of securities measured at fair value on a recurring basis. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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