XML 75 R64.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Premises and Equipment - Calculated amount of right of use assets and lease liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024
Operating leases right of use asset | $ 6,990 |  | $ 6,990 |  | $ 6,669
Consolidated Balance Sheet |  |  |  |  |
Operating leases right of use asset | $ 6,990 |  | $ 6,990 |  | $ 6,669
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, Plant and Equipment, Net |  | Property, Plant and Equipment, Net |  | Property, Plant and Equipment, Net
Operating leases liability | $ 6,990 |  | $ 6,990 |  | $ 6,669
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Accounts Payable and Other Accrued Liabilities |  | Accounts Payable and Other Accrued Liabilities |  | Accounts Payable and Other Accrued Liabilities
Consolidated Statement Of Income |  |  |  |  |
Operating lease costs classified as occupancy and equipment expense (includes short-term lease costs) | $ 297 | $ 307 | $ 595 | $ 586 |
Supplemental Disclosures Of Cash Flow Information | Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |
Operating cash flows from operating leases | $ 205 | $ 243 | $ 411 | $ 414 |

X
- 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

X
- 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

X
- Definition Present value of lessee's discounted obligation for lease payments from 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 (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes operating lease liability. + 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
Name: | us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=smbc_ConsolidatedBalanceSheetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=smbc_ConsolidatedStatementOfIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=smbc_SupplementalDisclosuresOfCashFlowInformationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=smbc_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |