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v3.20.2

Employee Benefits - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - $ / shares | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Employee Benefits |  |  |
Fair Value Assumptions, Expected Dividend Yield | 1.60% | 1.51% | 1.18%
Fair Value Assumptions Expected Volatility Rate | 22.55% | 20.39% | 20.42%
Fair Value Assumptions Risk Free Interest Rate | 1.55% | 2.67% | 2.54%
Fair value assumptions weighted-average expected life (years) | 10 years | 10 years | 10 years
Fair value assumptions weighted-average fair value of | $ 8.81 | $ 8.78 | $ 10.14

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

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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: | num: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: | num: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
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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: | num: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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