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Employee Benefits - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - $ / shares | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Employee Benefits |  |  |
Expected dividend yield | 1.79% | 1.49% | 1.83%
Expected volatility | 29.67% | 28.02% | 27.72%
Risk-free interest rate | 3.79% | 1.82% | 1.14%
Weighted-average expected life (years) | 10 years | 10 years | 10 years
Weighted-average fair value of options granted during the year | $ 16.68 | $ 16.38 | $ 9.19

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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
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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
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- 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_
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Balance Type: | na
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