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Organization and Summary of Significant Accounting Policies - Wealth Management Assets and Fees (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
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Organization and Summary of Significant Accounting Policies |  |
Fiduciary assets | $ 100.9 | $ 102.0
Investment management assets | $ 474.7 | $ 464.2

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- Definition The carrying amount as of the balance sheet date of fiduciary assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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Namespace Prefix: | smbc_
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- Definition The carrying amount of assets an investment adviser manages on behalf of investors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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