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Premises and Equipment - Calculated amount of right of use assets and lease liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Premises and Equipment |  |
Operating leases right of use asset | $ 6,669 | $ 6,125
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, Plant and Equipment, Net | Property, Plant and Equipment, Net
Operating leases liability | $ 6,669 | $ 6,125
Operating lease costs classified as occupancy and equipment expense (includes short-term lease costs) | 1,215 | 720
Operating cash flows from operating leases | 840 | $ 524
ROU assets obtained in exchange for operating lease obligations: | $ 2,445 |

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- Definition Represents the monetary amount of Operating Cash Flows from Operating Leases, during the indicated time period. + References No definition available. + Details
Name: | smbc_OperatingCashFlowsFromOperatingLeases
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the monetary amount of Operating Lease Costs Classified as Occupancy and Equipment Expense, during the indicated time period. + References No definition available. + Details
Name: | smbc_OperatingLeaseCostsClassifiedAsOccupancyAndEquipmentExpense
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease obligations. + References No definition available. + Details
Name: | smbc_RightOfUseAssetObtainedInExchangeForOperatingLeaseObligations
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

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