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Loans and Allowance for Loan Losses (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($)
Receivables [Abstract] |
Principal amount outstanding of non-homogeneous loans | $ 100,000
Description of Impaired loans which included in groups of homogenous loans | Impaired loans less than $100,000 are included in groups of homogenous loans.
Payment deferral amount | $ 23,200,000
Loan originated amount | 83,600,000
Outstanding loan amount | 70,600,000
Origination fees | 3,200,000
Amount of origination income | $ 1,400,000

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- Definition Impaired loans which included in groups of homogenous loans. + References No definition available. + Details
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Period Type: | duration

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- Definition Loan originated amount. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Loan outstanding amount. + References No definition available. + Details
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Namespace Prefix: | sbfg_
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Balance Type: | credit
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- Definition Origination fees. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of origination income. + References No definition available. + Details
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- Definition Payment deferral amount + References No definition available. + Details
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Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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=121570589&loc=d3e107314-111719 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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