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Organization and Summary of Significant Accounting Policies - Loans (Details) | 6 Months Ended
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Dec. 31, 2024 item
Organization and Summary of Significant Accounting Policies |
Number of loan portfolio pools | 24

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- Definition Represents the number of loan portfolio segments. + References No definition available. + Details
Name: | smbc_NumberOfLoanSegments
Namespace Prefix: | smbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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