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Loans and Allowance for Loan Losses (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($)
Receivables [Abstract] |
Principal amount outstanding of loans held-in-portfolio | $ 100
Impaired loans which included in groups of homogenous loans | Impaired loans less than $100,000 are included in groups of homogenous loans.

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- Definition Impaired loans which included in groups of homogenous loans. + References No definition available. + Details
Name: | sbfg_ImpairedLoansWhichIncludedInGroupsOfHomogenousLoans
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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