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Commitments and Contingencies - Off-balance-sheet and Credit Risk (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023
Unused Commitments to Extend Credit | $ 898.6 | $ 912.0
Commitments to originate fixed rate loans | $ 159.3 |
Weighted-average rate | 7.04% |
Commitments extended period | 30 days |
Diversified portfolio, loans | $ 1,500.0 |
Minimum [Member] |  |
Term | 12 months |
Commitments to originate fixed rate loans rates | 4.95% |
Maximum [Member] |  |
Term | 24 months |
Commitments to originate fixed rate loans rates | 9.00% |

X
- Definition Represents the information pertaining to commitments extended period of time + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the Commitments to Originate Fixed Rate Loans Rates, during the indicated time period. + References No definition available. + Details
Name: | smbc_CommitmentsToOriginateFixedRateLoansRates
Namespace Prefix: | smbc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Diversified portfolio, loans aggregating are secured by single and multi-family residential real estate + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition weighted average rate. + References No definition available. + Details
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Namespace Prefix: | smbc_
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Balance Type: | na
Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478898/942-825-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478898/942-825-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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