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v3.20.4

Premises and Equipment - Lessor Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Premises and Equipment |  |  |  |
Income recognized from lessor agreements | $ 81,000 | $ 80,000 | $ 156,000 | $ 162,000

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