XML 61 R52.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Loans and Allowance for Credit Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans | $ 2,963 | $ 5,868
Residential Real Estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans | 1,011 | 3,235
Construction Real Estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans |  | 30
Commercial Real Estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans | 1,631 | 1,914
Consumer loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans | 76 | 100
Commercial loans |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual loans | $ 245 | $ 589

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

X
- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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