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Deposits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Deposits |  |
Aggregate Amount of Deposits With a Minimum Denomination of $250,000 | $ 1,200.0 | $ 1,200.0
Brokered certificates | 171.8 | 146.5
Deposits Held for Affiliates | $ 6.5 | $ 6.6

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- Definition Represents the monetary amount of Aggregate Amount of Deposits With a Minimum Denomination of $250,000, as of the indicated date. + References No definition available. + Details
Name: | smbc_AggregateAmountOfDepositsWithAMinimumDenominationOf250000
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the monetary amount of Deposits Held for Affiliates, during the indicated time period. + References No definition available. + Details
Name: | smbc_DepositsHeldForAffiliates
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant