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Loans and Allowance for Credit Losses (Details) - Schedule of Credit Losses for Unfunded Loan Commitments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Loans and Allowance for Credit Losses [Abstract]
Balance, beginning of period	$ 862	$ 1,086	$ 776
Adjustment for adoption of ASU 2016-13				$ 1,149
Provision for unfunded commitments	47	(230)	133	(293)
Balance, end of period	$ 909	$ 856	$ 909	$ 856

X

- Definition

The amount of accumulated credit loss for unfunded loan commitments.

+ References

No definition available.

+ Details

Name:	sbfg_AccumulatedCreditLossForUnfundedLoanCommitments
Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of adjustment for adoption.

+ References

No definition available.

+ Details

Name:	sbfg_AdjustmentForAdoptionOfASU201613
Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	sbfg_LoansandAllowanceforCreditLossesDetailsScheduleofCreditLossesforUnfundedLoanCommitmentsLineItems
Namespace Prefix:	sbfg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of provision for unfunded commitments.

+ References

No definition available.

+ Details

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