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Organization and Summary of Significant Accounting Policies - Loans (Details)	6 Months Ended
	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