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Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Impaired loans [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	$ 464	$ 3,544
Mortgage servicing rights [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	3,301	7,759
Fair Value, Inputs, Level 1 [Member] | Impaired loans [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 1 [Member] | Mortgage servicing rights [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 2 [Member] | Impaired loans [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 2 [Member] | Mortgage servicing rights [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring
Fair Value, Inputs, Level 3 [Member] | Impaired loans [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	464	3,544
Fair Value, Inputs, Level 3 [Member] | Mortgage servicing rights [Member]
Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of fair value measurements, nonrecurring [Line Items]
Assets, fair value, nonrecurring	$ 3,301	$ 7,759

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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- Details

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- Details

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X

- Details

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- Details

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- Details

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