XML 85 R69.htm IDEA: XBRL DOCUMENT
v3.20.4

Accounting for Certain Loans Acquired in a Transfer (Details) $ in Millions | Dec. 31, 2020 USD ($)
--- | ---
Accounting Policies [Abstract] |
Amount of accretable yield or income expected to be collected | $ 0.3

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

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