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Disclosures About Fair Value of Assets and Liabilities (Details) - Schedule of recurring fair value measurements consolidated balance sheets - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Interest Rate Lock Commitments |  |  |  |
Balance at beginning of period | $ 54 | $ 120 | $ 22 | $ 278
Balance at end of period | (147) | (119) | (147) | (119)
Change in fair value | $ (201) | $ (239) | $ (169) | $ (397)

X
- Definition Amount of fair market value. + References No definition available. + Details
Name: | sbfg_FairMarketValue
Namespace Prefix: | sbfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- 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