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Loans and Allowance for Credit Losses - Schedule of Activity in the ACL for Unfunded Loan Commitments (Details) - Unfunded Loan Commitments [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Activity in the ACL for Unfunded Loan Commitments [Line Items]
Balance, beginning of period	$ 1,650	$ 909	$ 1,340	$ 776
Adjustment for acquired loans			3
Provision for unfunded commitments	(176)	507	131	640
Balance, end of period	$ 1,474	$ 1,416	$ 1,474	$ 1,416

X

- Definition

Represent the amount of adjustment for acquired loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of expense related to credit loss from transactions other than loan and lease transactions.

+ References

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