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Employee Benefits - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - $ / shares | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Employee Benefits |  |  |
Expected dividend yield | 2.06% | 1.79% | 1.49%
Expected volatility | 34.89% | 29.67% | 28.02%
Risk-free interest rate | 4.12% | 3.79% | 1.82%
Weighted-average expected life (years) | 10 years | 10 years | 10 years
Weighted-average fair value of options granted during the year | $ 15.88 | $ 16.68 | $ 16.38

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- Definition Represents the Fair Value Assumptions, Expected Dividend Yield, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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- Definition Represents the Fair Value Assumptions Expected Volatility Rate, during the indicated time period. + References No definition available. + Details
Name: | smbc_FairValueAssumptionsExpectedVolatilityRate1
Namespace Prefix: | smbc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the Fair Value Assumptions Risk Free Interest Rate, during the indicated time period. + References No definition available. + Details
Name: | smbc_FairValueAssumptionsRiskFreeInterestRate1
Namespace Prefix: | smbc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the pure numeric value of Fair value assumptions weighted-average expected life (years), as of the indicated date. + References No definition available. + Details
Name: | smbc_FairValueAssumptionsWeightedAverageExpectedLifeYears
Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the per-share monetary value of Fair value assumptions weighted-average fair value of options granted during the year, as of the indicated date. + References No definition available. + Details
Name: | smbc_FairValueAssumptionsWeightedAverageFairValueOfOptionsGrantedDuringTheYear
Namespace Prefix: | smbc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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