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v3.21.2

Commitments and Credit Risk - Standby Letters of Credit: Letters of Credit (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020
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Commitments and Credit Risk |  |
Letters of credit outstanding amount | $ 4.0 | $ 3.2

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant