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Loans and Allowance for Loan Losses - Purchased Credit Impaired Loans (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 30, 2019
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Pass |  |
Purchased credit impaired loans | $ 5.9 | $ 6.9
Watch |  |
Purchased credit impaired loans | 10.3 | 10.4
Special Mention |  |
Purchased credit impaired loans | 0.0 | 0.0
Substandard |  |
Purchased credit impaired loans | 5.6 | 11.2
Doubtful |  |
Purchased credit impaired loans | $ 0.0 | $ 0.0

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- Definition Represents the monetary amount of Purchased Credit Impaired Loans, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Balance Type: |
Period Type: |

X
- Details
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Balance Type: |
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X
- Details
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |