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Mortgage Servicing Rights (Details) - Schedule of Mortgage Servicing Rights Capitalized and Related Amortization - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Transfers and Servicing [Abstract]
Carrying amount, beginning of year	$ 13,906	$ 13,503
Mortgage servicing rights capitalized during the year	377	280
Mortgage servicing rights amortization during the year	(273)	(291)
Net change in valuation allowance	181	56
Carrying amount, end of year	14,191	13,548
Valuation allowance:
Beginning of year	227	177
Increase (reduction)	(181)	(56)
End of year	46	121
Fair value, beginning of period	17,125	15,754
Fair value, end of period	$ 18,141	$ 16,911

X

- Definition

Represent the amount of increase decrease valuation allowance.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
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Balance Type:	credit
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X

- Definition

The servicing rights that are created when mortgages are sold or transferred.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represent the amount of mortgage servicing rights capitalized during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-4

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X

- Definition

Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-4

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480591/815-20-50-1

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- Definition

Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(5)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-4

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- References

No definition available.

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- Definition

Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-4

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