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v3.20.4

Premises and Equipment - Leases (Details) | 6 Months Ended
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Dec. 31, 2020 property
Number of lease properties | 5
Discount rate, lease | 5.00%
Minimum |
Expected lease terms range | 18 months
Maximum |
Expected lease terms range | 20 years

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- 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

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- Definition Represents the number of lease properties. + References No definition available. + Details
Name: | smbc_NumberOfLeaseProperties
Namespace Prefix: | smbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
Name: | us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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