XML 40 R30.htm IDEA: XBRL DOCUMENT
v3.23.3

Organization and Summary of Significant Accounting Policies - Organization (Details) $ in Billions | Sep. 30, 2023 USD ($)
--- | ---
Organization and Summary of Significant Accounting Policies |
Assets of the REIT | $ 1.4

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

X
- Definition For banks, amount of real estate assets held by entities that are wholly-owned. + References No definition available. + Details
Name: | us-gaap_AssetsOfWhollyOwnedRealEstateInvestmentSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant