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v3.20.4

Earnings Per Share - Additional information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Share |  |  |  |
Options Outstanding With An Exercise Price In Excess of the Market Price | 50,500 | 13,500 | 50,500 | 13,500

X
- Definition Represents the pure numeric value of Options Outstanding With An Exercise Price In Excess of the Market Price, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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