XML 67 R57.htm IDEA: XBRL DOCUMENT
v3.23.3

Premises and Equipment - Additional Information (Details) | 3 Months Ended
--- | ---
Sep. 30, 2023 USD ($) property | Sep. 30, 2022 USD ($)
Number of leased properties | property | 13 |
Income recognized from lessor agreements | $ | $ 57,000 | $ 72,000
Minimum |  |
Lessee Expected Lease Terms | P18M |
Maximum |  |
Lessee Expected Lease Terms | P20Y |

X
- Definition Represents the monetary amount of Income Recognized From Lessor Agreements, during the indicated time period. + References No definition available. + Details
Name: | smbc_IncomeRecognizedFromLessorAgreements
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the description of Lessee Expected Lease Terms, during the indicated time period. + References No definition available. + Details
Name: | smbc_LesseeExpectedLeaseTerms
Namespace Prefix: | smbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of separate real estate development properties located on land subject to ground leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_NumberOfPropertiesSubjectToGroundLeases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |