XML 79 R63.htm IDEA: XBRL DOCUMENT
v3.20.2

Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019
Financing Receivable, Credit Quality, Additional Information | lending relationships of $3 million or more, exclusive of any consumer or owner-occupied residential loan, are subject to an annual credit analysis which is prepared by the loan administration department and presented to a loan committee with appropriate lending authority. A sample of lending relationships in excess of $1 million (exclusive of single-family residential real estate loans) are subject to an independent loan review annually, in order to verify risk ratings. |
Loans without a specific valuation allowance |  |
Purchased Credit Impaired Loans | $ 21.8 | $ 28.5

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

X
- Definition Includes any additional disclosures related to the credit quality of financing receivables. This may include a description of a credit quality indicator or a description of how the internal risk ratings used by a company relate to the likelihood of loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953659-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953664-111524 + Details
Name: | us-gaap_FinancingReceivableCreditQualityAdditionalInformation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=smbc_LoansWithoutASpecificValuationAllowanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |