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Loans and Allowance for Credit Losses - Schedule of Related Party Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Schedule of Related Party Loans [Abstract] |  |
Balance at beginning of period | $ 435 | $ 521
Effect of change in compostion of directors and executive officers |  |
New Term Loans |  |
Repayment of term loans | (33) | (144)
Changes in balances of revolving lines of credit | 48 | 58
Balance at end of period | $ 450 | $ 435

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- Definition Changes in balances of revolving lines of credit. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Effect of change in compostioin of directors and executive officers. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of related party loans. + References No definition available. + Details
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Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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- References No definition available. + Details
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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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Balance Type: | credit
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