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Organization and Summary of Significant Accounting Policies - Outside Directors' Retirement (Details) | 6 Months Ended
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Dec. 31, 2020 age
Organization and Summary of Significant Accounting Policies |
Requisite period | 60
Vesting period | 5 years

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- Definition Minimum period the individual is required to perform services to be fully vested under the retirement plan, + References No definition available. + Details
Name: | smbc_RetirementPlanRequisiteServicePeriod
Namespace Prefix: | smbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Vesting term of retirement plans. + References No definition available. + Details
Name: | smbc_RetirementPlanVestingPeriod
Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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