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Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights Capitalized and Related Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Mortgage Servicing Rights Capitalized and Related Amortization [Abstract]
Balance at beginning of period	$ 15,458	$ 14,548	$ 14,868	$ 13,906
Mortgage servicing rights capitalized during the period	646	644	1,828	1,675
Mortgage servicing rights amortization during the period	(456)	(370)	(1,218)	(978)
Net change in valuation allowance	(301)	(465)	(131)	(246)
Balance at end of period	15,347	14,357	15,347	14,357
Valuation allowance:
Balance at beginning of period	16	8	186	227
Increase (decrease)	301	465	131	246
Balance at end of period	317	473	317	473
Fair value, beginning of period	19,108	18,807	17,782	17,125
Fair value, end of period	$ 18,315	$ 18,160	$ 18,315	$ 18,160

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
Period Type:	instant

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_
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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

+ Details

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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

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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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- 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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Balance Type:	credit
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X

- Definition

The net increase (decrease) in the valuation allowance for servicing assets subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-4

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