XML 90 R74.htm IDEA: XBRL DOCUMENT
v3.25.2

Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details) | 12 Months Ended
--- | ---
Jun. 30, 2025 USD ($) loan | Jun. 30, 2024 USD ($) loan
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 4,100,768,000 | $ 3,850,035,000
Number of PCD loans greater than 90 days past due | loan | 3 | 1
Purchased credit-impaired loans | $ 6,200,000 | $ 560,000
Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 25,623,000 | 9,201,000
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,470,000 | 3,128,000
60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,593,000 | 2,621,000
Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 19,560,000 | 3,452,000
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 4,075,145,000 | 3,840,834,000
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 510,259,000 | 450,147,000
Commercial and industrial | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,111,000 | 2,059,000
Commercial and industrial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,055,000 | 641,000
Commercial and industrial | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 219,000 | 83,000
Commercial and industrial | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,837,000 | 1,335,000
Commercial and industrial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 507,148,000 | 448,088,000
Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 206,128,000 | 175,968,000
Agriculture production | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 405,000 | 394,000
Agriculture production | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 163,000 | 50,000
Agriculture production | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 164,000 |
Agriculture production | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 78,000 | 344,000
Agriculture production | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 205,723,000 | 175,574,000
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 55,387,000 | 59,671,000
Consumer | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 552,000 | 399,000
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 380,000 | 311,000
Consumer | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 98,000 | 74,000
Consumer | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 74,000 | 14,000
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 54,835,000 | 59,272,000
All other loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,102,000 | 3,981,000
All other loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,102,000 | 3,981,000
Secured by real estate | 1-4 residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 992,445,000 | 925,397,000
Secured by real estate | 1-4 residential real estate | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,732,000 | 3,641,000
Secured by real estate | 1-4 residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,317,000 | 890,000
Secured by real estate | 1-4 residential real estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,973,000 | 2,087,000
Secured by real estate | 1-4 residential real estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,442,000 | 664,000
Secured by real estate | 1-4 residential real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 986,713,000 | 921,756,000
Secured by real estate | Commercial Real Estate | Non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 888,317,000 | 899,770,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,846,000 | 107,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 62,000 | 107,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,784,000 |
Secured by real estate | Commercial Real Estate | Non-owner occupied | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 882,471,000 | 899,663,000
Secured by real estate | Commercial Real Estate | Owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 442,984,000 | 427,476,000
Secured by real estate | Commercial Real Estate | Owner occupied | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,105,000 | 1,365,000
Secured by real estate | Commercial Real Estate | Owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable |  | 305,000
Secured by real estate | Commercial Real Estate | Owner occupied | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 116,000 |
Secured by real estate | Commercial Real Estate | Owner occupied | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 989,000 | 1,060,000
Secured by real estate | Commercial Real Estate | Owner occupied | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 441,879,000 | 426,111,000
Secured by real estate | Multi-family real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 422,758,000 | 384,564,000
Secured by real estate | Multi-family real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 422,758,000 | 384,564,000
Secured by real estate | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 332,405,000 | 290,541,000
Secured by real estate | Construction and land development | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 6,070,000 | 628,000
Secured by real estate | Construction and land development | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 315,000 | 251,000
Secured by real estate | Construction and land development | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 12,000 | 377,000
Secured by real estate | Construction and land development | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,743,000 |
Secured by real estate | Construction and land development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 326,335,000 | 289,913,000
Secured by real estate | Agriculture real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 244,983,000 | 232,520,000
Secured by real estate | Agriculture real estate | Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,802,000 | 608,000
Secured by real estate | Agriculture real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 178,000 | 573,000
Secured by real estate | Agriculture real estate | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 11,000 |
Secured by real estate | Agriculture real estate | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,613,000 | 35,000
Secured by real estate | Agriculture real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 242,181,000 | $ 231,912,000

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, fee, after loan in process, of financing receivable. Excludes net investment in leases. + References No definition available. + Details
Name: | smbc_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAfterLoanInProcess
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivable contracts, purchased with credit deterioration which is 90 days or more past due and on non accrual status. + References No definition available. + Details
Name: | smbc_FinancingReceivablePurchasedWithCreditDeterioration90DaysOrMorePastDueNonAccrualNumberOfContracts
Namespace Prefix: | smbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount at purchase price of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-19 + Details
Name: | us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 13: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 14: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 15: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 16: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 17: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=smbc_CommercialAndIndustrialPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=smbc_AgricultureProductionPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=srt_OtherPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=srt_SingleFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=srt_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=smbc_ConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=smbc_AgricultureRealEstatePortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |