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v3.23.2

Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of Fair Value Measurements Recognized in the Accompanying Consolidated Balance Sheets Using Significant Unobservable (Level 3) Inputs - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Interest rate lock commitments |  |  |  |
Balance at beginning of period | $ 45 | $ (155) | $ (20) | $ 22
Balance at end of period | (10) | 54 | (10) | 54
Change in fair value | $ (55) | $ 209 | $ 10 | $ 32

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- Definition AssetsFairValueDisclosures. + References No definition available. + Details
Name: | sbfg_AssetsFairValueDisclosures
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | sbfg_InterestRateLockCommitmentsAbstract
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration