XML 55 R45.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans and Allowance for Credit Losses - Allowance for off-balance credit exposure (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period | $ 1,805 | $ 1,959
Provision (benefit) charged to expense | 374 | 226
Balance, end of period | 2,179 | 2,453
Impact of adoption ASU 2016-13 |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period |  | 268
Residential Real Estate |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period | 37 | 19
Provision (benefit) charged to expense | (3) | 5
Balance, end of period | 34 | 59
Residential Real Estate | Impact of adoption ASU 2016-13 |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period |  | 35
Construction Real Estate |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period | 502 | 769
Provision (benefit) charged to expense | 1,171 | 166
Balance, end of period | 1,673 | 768
Construction Real Estate | Impact of adoption ASU 2016-13 |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period |  | (167)
Commercial Real Estate |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period | 188 | 172
Provision (benefit) charged to expense | (18) | 32
Balance, end of period | 170 | 299
Commercial Real Estate | Impact of adoption ASU 2016-13 |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period |  | 95
Consumer loans |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period | 218 | 153
Provision (benefit) charged to expense | (160) | 4
Balance, end of period | 58 | 354
Consumer loans | Impact of adoption ASU 2016-13 |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period |  | 197
Commercial loans |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period | 860 | 846
Provision (benefit) charged to expense | (616) | 19
Balance, end of period | $ 244 | 973
Commercial loans | Impact of adoption ASU 2016-13 |  |
Allowance for off-balance sheet credit exposure: |  |
Balance, beginning of period |  | $ 108

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82919202-210446 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiabilityRollforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=smbc_ConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |