XML 58 R48.htm IDEA: XBRL DOCUMENT
v3.25.3

Loans and Allowance for Credit Losses - Activity in the Allowance for credit losses (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Allowance for credit losses: |  |
Balance, beginning of period | $ 51,629 | $ 52,516
Provision (benefit) charged to expense | 4,141 | 2,021
Losses charged off | (3,871) | (159)
Recoveries | 182 | 59
Balance, end of period | 52,081 | 54,437
Commercial and industrial |  |
Allowance for credit losses: |  |
Balance, beginning of period | 6,952 | 6,233
Provision (benefit) charged to expense | 1,190 | (85)
Losses charged off | (341) | (39)
Recoveries | 32 | 5
Balance, end of period | 7,833 | 6,114
Agriculture production |  |
Allowance for credit losses: |  |
Balance, beginning of period | 3,374 | 835
Provision (benefit) charged to expense | 221 | (51)
Losses charged off | (53) |
Recoveries | 66 |
Balance, end of period | 3,608 | 784
Consumer |  |
Allowance for credit losses: |  |
Balance, beginning of period | 952 | 578
Provision (benefit) charged to expense | 399 | 13
Losses charged off | (291) | (72)
Recoveries | 84 | 7
Balance, end of period | 1,144 | 526
All other loans |  |
Allowance for credit losses: |  |
Balance, beginning of period | 4 | 17
Provision (benefit) charged to expense | (2) | (3)
Balance, end of period | 2 | 14
Secured by real estate | 1-4 Family residential real estate |  |
Allowance for credit losses: |  |
Balance, beginning of period | 10,274 | 10,528
Provision (benefit) charged to expense | 1,310 | 157
Losses charged off | (150) | (48)
Balance, end of period | 11,434 | 10,637
Secured by real estate | Commercial Real Estate | Non-owner occupied |  |
Allowance for credit losses: |  |
Balance, beginning of period | 12,241 | 19,055
Provision (benefit) charged to expense | 1,148 | 1,673
Losses charged off | (2,875) |
Balance, end of period | 10,514 | 20,728
Secured by real estate | Commercial Real Estate | Owner occupied |  |
Allowance for credit losses: |  |
Balance, beginning of period | 4,521 | 4,815
Provision (benefit) charged to expense | (189) | (1)
Balance, end of period | 4,332 | 4,814
Secured by real estate | Multi-family real estate |  |
Allowance for credit losses: |  |
Balance, beginning of period | 4,329 | 5,447
Provision (benefit) charged to expense | (350) | (376)
Recoveries |  | 47
Balance, end of period | 3,979 | 5,118
Secured by real estate | Construction and land development |  |
Allowance for credit losses: |  |
Balance, beginning of period | 4,788 | 2,901
Provision (benefit) charged to expense | (154) | 774
Losses charged off | (161) |
Balance, end of period | 4,473 | 3,675
Secured by real estate | Agriculture real estate |  |
Allowance for credit losses: |  |
Balance, beginning of period | 4,194 | 2,107
Provision (benefit) charged to expense | 568 | (80)
Balance, end of period | $ 4,762 | $ 2,027

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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: |