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Employee Benefits - 401(k) Retirement Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Employee Benefits |  |  |
Matching contributions of eligible compensation | 4.00% |  |
Additional profit-sharing contributions of eligible salary | 5.00% |  |
401(k) Retirement Plan Expense | $ 1.7 | $ 1.5 | $ 1.3
401(k) Retirement Plan Shares Held | 394,000 |  |
Vesting period | 5 years |  |

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- Definition Represents the monetary amount of 401(k) Retirement Plan Expense, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the 401(k) Retirement Plan Shares Held (number of shares), as of the indicated date. + References No definition available. + Details
Name: | smbc_N401KRetirementPlanSharesHeld
Namespace Prefix: | smbc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsAbstract
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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