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Loans and Allowance for Loan Losses - Purchased Credit Impaired Loans Nonaccrual (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 30, 2019
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Included in Nonaccrual Loans |  |
Purchased credit impaired loans | $ 0.0 | $ 4.1

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- Definition Represents the monetary amount of Purchased Credit Impaired Loans, as of the indicated date. + References No definition available. + Details
Name: | smbc_PurchasedCreditImpairedLoans
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=smbc_IncludedInNonaccrualLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |