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Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Securities Sold Under Agreements to Repurchase |  |
Year-end balance | $ 0 | $ 4,376
Average balance during the year | 82 | 3,988
Maximum month-end balance during the year | $ 0 | $ 4,703
Average interest during the year | 0.03% | 0.90%
Year-end interest rate | 0.00% | 0.93%

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- Definition Represents the monetary amount of Securities Sold Under Agreements to Repurchase Average Balance During Year, during the indicated time period. + References No definition available. + Details
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- Definition Represents the Securities Sold Under Agreements to Repurchase Average Interest Rate During Year, during the indicated time period. + References No definition available. + Details
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- Definition Represents the monetary amount of Securities Sold Under Agreements to Repurchase Maximum Month-End Balance During Year, during the indicated time period. + References No definition available. + Details
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- Definition Represents the monetary amount of Securities Sold Under Agreements to Repurchase Year-End Balance, during the indicated time period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Represents the Securities Sold Under Agreements to Repurchase Year-End Interest Rate, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | num:percentItemType
Balance Type: | na
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- References No definition available. + Details
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