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v3.20.2

Organization and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) | 12 Months Ended
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Jun. 30, 2020
Minimum |
Increase in estimated ACL (as a percent) | 27.00%
ACL expected percentage | 1.48%
Maximum |
Increase in estimated ACL (as a percent) | 35.00%
ACL expected percentage | 1.57%

X
- Definition Represents the allownace for credit losses (ACL) estimated percentage of occurence , upon adoption of the new accounting standards. + References No definition available. + Details
Name: | smbc_AllowanceForCreditLossesEstimatedPercentageUponAdoption
Namespace Prefix: | smbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the expected increase in allowance for credit losses (ACL) upon adoption of the accounting standards. + References No definition available. + Details
Name: | smbc_AllowanceForCreditLossesPercentageOfExpectedIncrease
Namespace Prefix: | smbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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: |