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Accounting for Certain Acquired Loans - Accretable Yield (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Accounting for Certain Acquired Loans. |  |  |
Balance at beginning of period | $ 220 | $ 589 | $ 609
Certain Loans Acquired In Transfer Accretable Yield Additions | 0 | 102 | 0
Certain Loans Acquired In Transfer Accretable Yield Accretion | (236) | (1,342) | (683)
Certain Loans Acquired In Transfer Accretable Yield Reclassification from Nonaccretable Difference | 256 | 1,075 | 663
Certain Loans Acquired In Transfer Accretable Yield Disposals | 0 | (204) | 0
Balance at end of period | $ 240 | $ 220 | $ 589

X
- Definition Not Available. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the monetary amount of Certain Loans Acquired In Transfer Accretable Yield Accretion, during the indicated time period. + References No definition available. + Details
Name: | smbc_CertainLoansAcquiredInTransferAccretableYieldAccretion
Namespace Prefix: | smbc_
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X
- Definition Represents the monetary amount of Certain Loans Acquired In Transfer Accretable Yield Additions, during the indicated time period. + References No definition available. + Details
Name: | smbc_CertainLoansAcquiredInTransferAccretableYieldAdditions
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Represents the monetary amount of Certain Loans Acquired In Transfer Accretable Yield Disposals, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Certain Loans Acquired In Transfer Accretable Yield Reclassification from Nonaccretable Difference, during the indicated time period. + References No definition available. + Details
Name: | smbc_CertainLoansAcquiredInTransferAccretableYieldReclassificationFromNonaccretableDifference
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
Name: | us-gaap_CertainLoansAcquiredInTransferAccretableYield
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant