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Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Impaired Loans [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring | $ 2,354 | $ 2,527
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring | 2,354 | 2,527
Mortgage Servicing Rights [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring | 8,211 | 5,084
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring |  |
Mortgage Servicing Rights [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring | 8,211 | 5,084
IRLCs [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring | 726 | 55
IRLCs [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring |  |
IRLCs [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring |  |
IRLCs [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value of Assets and Liabilities (Details) - Summary of fair value measurements of assets measured at fair value on a non-recurring basis [Line Items] |  |
Assets, fair value, nonrecurring | $ 726 | $ 55

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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
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- References No definition available. + Details
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- Details
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