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v3.20.2

Loans and Allowance for Loan Losses - Commercial Real Estate Lending (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Maximum |  |
Term for Automobile Loans | 66 months |
Secured by Properties Located Outside Lending Area [Member] |  |
Loans Receivable | $ 281,400 |
Commercial |  |
Loans Receivable | $ 887,419 | $ 840,777
Commercial | Maximum |  |
Amortization Period | 25 years |
Residential |  |
Loans Receivable | $ 627,357 | 491,992
Residential | Maximum |  |
Amortization Period | 30 years |
Consumer loans |  |
Loans Receivable | $ 80,767 | $ 97,534
Amortization Period For 80% Loan To Value Ratio | 25 years |
Amortization Period For 75% Loan To Value Ratio | 30 years |

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- Definition It represents amortization period. + References No definition available. + Details
Name: | smbc_AmortizationPeriod
Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents amortization period for 75% loan-to-value ratio + References No definition available. + Details
Name: | smbc_AmortizationPeriodFor75LoanToValueRatio
Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents amortization period for 80% loan-to-value ratio + References No definition available. + Details
Name: | smbc_AmortizationPeriodFor80LoanToValueRatio
Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the monetary amount of Loans Receivable, during the indicated time period. + References No definition available. + Details
Name: | smbc_LoansReceivable
Namespace Prefix: | smbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition It represents information about term for automobile loans. + References No definition available. + Details
Name: | smbc_TermForAutomobileLoans
Namespace Prefix: | smbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_MortgageLoansOnRealEstateLoanTypeAxis=smbc_SecuredByPropertiesLocatedOutsideLendingAreaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateLoanTypeAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateLoanTypeAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |