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Loans and Allowance for Loan Losses (Details)	3 Months Ended
	Mar. 31, 2021 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.

X

- 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

X

- 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

Name:	us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration