XML 65 R54.htm IDEA: XBRL DOCUMENT
v3.25.3

LOANS - Aging Status of Recorded Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Aging Status of recorded investment |  |
Loans | $ 4,867,587 | $ 5,167,574
Nonaccrual | 64,121 | 140,138
Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 64,121 | 140,138
30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 16,611 | 32,355
60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 9,408 | 11,326
Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 4,582 | 10,769
Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 30,601 | 54,450
Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 4,772,865 | 4,972,986
Commercial Loan Portfolio |  |
Aging Status of recorded investment |  |
Loans | 4,073,267 | 4,251,326
Nonaccrual | 53,124 | 128,548
Commercial Loan Portfolio | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 53,124 | 128,548
Commercial Loan Portfolio | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 11,170 | 26,905
Commercial Loan Portfolio | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 7,190 | 6,633
Commercial Loan Portfolio | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 4,536 | 10,769
Commercial Loan Portfolio | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 22,896 | 44,307
Commercial Loan Portfolio | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 3,997,247 | 4,078,471
Commercial Loan Portfolio | Commercial |  |
Aging Status of recorded investment |  |
Loans | 1,038,821 | 818,496
Nonaccrual | 7,339 | 9,752
Commercial Loan Portfolio | Commercial | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 7,339 | 9,752
Commercial Loan Portfolio | Commercial | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 696 | 4,562
Commercial Loan Portfolio | Commercial | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 349
Commercial Loan Portfolio | Commercial | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Commercial | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 696 | 4,911
Commercial Loan Portfolio | Commercial | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 1,030,786 | 803,833
Commercial Loan Portfolio | Commercial other |  |
Aging Status of recorded investment |  |
Loans | 437,712 | 541,324
Nonaccrual | 6,904 | 3,439
Commercial Loan Portfolio | Commercial other | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 6,904 | 3,439
Commercial Loan Portfolio | Commercial other | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 10,179 | 9,578
Commercial Loan Portfolio | Commercial other | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 7,035 | 6,284
Commercial Loan Portfolio | Commercial other | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 4,536 | 10,769
Commercial Loan Portfolio | Commercial other | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 21,750 | 26,631
Commercial Loan Portfolio | Commercial other | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 409,058 | 511,254
Commercial Loan Portfolio | Commercial real estate non-owner occupied |  |
Aging Status of recorded investment |  |
Loans | 1,457,627 | 1,628,961
Nonaccrual | 19,788 | 33,360
Commercial Loan Portfolio | Commercial real estate non-owner occupied | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 19,788 | 33,360
Commercial Loan Portfolio | Commercial real estate non-owner occupied | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 65 | 11,732
Commercial Loan Portfolio | Commercial real estate non-owner occupied | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Commercial real estate non-owner occupied | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Commercial real estate non-owner occupied | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 65 | 11,732
Commercial Loan Portfolio | Commercial real estate non-owner occupied | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 1,437,774 | 1,583,869
Commercial Loan Portfolio | Commercial real estate owner occupied |  |
Aging Status of recorded investment |  |
Loans | 425,712 | 440,806
Nonaccrual | 11,167 | 18,278
Commercial Loan Portfolio | Commercial real estate owner occupied | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 11,167 | 18,278
Commercial Loan Portfolio | Commercial real estate owner occupied | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 230 | 985
Commercial Loan Portfolio | Commercial real estate owner occupied | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 155 | 0
Commercial Loan Portfolio | Commercial real estate owner occupied | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Commercial real estate owner occupied | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 385 | 985
Commercial Loan Portfolio | Commercial real estate owner occupied | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 414,160 | 421,543
Commercial Loan Portfolio | Multi-family |  |
Aging Status of recorded investment |  |
Loans | 386,585 | 454,249
Nonaccrual | 716 | 54,133
Commercial Loan Portfolio | Multi-family | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 716 | 54,133
Commercial Loan Portfolio | Multi-family | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Multi-family | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Multi-family | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Multi-family | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Multi-family | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 385,869 | 400,116
Commercial Loan Portfolio | Farmland |  |
Aging Status of recorded investment |  |
Loans | 66,737 | 67,648
Nonaccrual | 1,676 | 1,148
Commercial Loan Portfolio | Farmland | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 1,676 | 1,148
Commercial Loan Portfolio | Farmland | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 48
Commercial Loan Portfolio | Farmland | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Farmland | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Farmland | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 48
Commercial Loan Portfolio | Farmland | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 65,061 | 66,452
Commercial Loan Portfolio | Construction and land development |  |
Aging Status of recorded investment |  |
Loans | 260,073 | 299,842
Nonaccrual | 5,534 | 8,438
Commercial Loan Portfolio | Construction and land development | Nonperforming |  |
Aging Status of recorded investment |  |
Nonaccrual | 5,534 | 8,438
Commercial Loan Portfolio | Construction and land development | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Construction and land development | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Construction and land development | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Construction and land development | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Commercial Loan Portfolio | Construction and land development | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 254,539 | 291,404
Residential real estate: | Residential first lien |  |
Aging Status of recorded investment |  |
Loans | 292,830 | 315,775
Nonaccrual | 3,060 | 2,992
Residential real estate: | Residential first lien | Performing |  |
Aging Status of recorded investment |  |
Loans | 289,735 | 312,783
Residential real estate: | Residential first lien | Nonperforming |  |
Aging Status of recorded investment |  |
Loans | 3,095 | 2,992
Nonaccrual | 3,060 | 2,992
Residential real estate: | Residential first lien | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 23 | 21
Residential real estate: | Residential first lien | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 383 | 650
Residential real estate: | Residential first lien | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 35 | 0
Residential real estate: | Residential first lien | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 441 | 671
Residential real estate: | Residential first lien | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 289,329 | 312,112
Residential real estate: | Other residential |  |
Aging Status of recorded investment |  |
Loans | 60,645 | 64,782
Nonaccrual | 524 | 446
Residential real estate: | Other residential | Performing |  |
Aging Status of recorded investment |  |
Loans | 60,121 | 64,336
Residential real estate: | Other residential | Nonperforming |  |
Aging Status of recorded investment |  |
Loans | 524 | 446
Nonaccrual | 524 | 446
Residential real estate: | Other residential | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 135 | 91
Residential real estate: | Other residential | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 40 | 38
Residential real estate: | Other residential | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Residential real estate: | Other residential | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 175 | 129
Residential real estate: | Other residential | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 59,946 | 64,207
Consumer: | Consumer |  |
Aging Status of recorded investment |  |
Loans | 82,710 | 96,202
Nonaccrual | 49 | 20
Consumer: | Consumer | Performing |  |
Aging Status of recorded investment |  |
Loans | 82,650 | 96,182
Consumer: | Consumer | Nonperforming |  |
Aging Status of recorded investment |  |
Loans | 60 | 20
Nonaccrual | 49 | 20
Consumer: | Consumer | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 190 | 314
Consumer: | Consumer | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 125 | 40
Consumer: | Consumer | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 11 | 0
Consumer: | Consumer | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 326 | 354
Consumer: | Consumer | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 82,335 | 95,828
Consumer: | Consumer other |  |
Aging Status of recorded investment |  |
Loans | 47,152 | 48,099
Consumer: | Consumer other | Performing |  |
Aging Status of recorded investment |  |
Loans | 47,152 | 48,099
Consumer: | Consumer other | Nonperforming |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Nonaccrual | 0 | 0
Consumer: | Consumer other | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 571 | 345
Consumer: | Consumer other | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 192 | 211
Consumer: | Consumer other | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Consumer: | Consumer other | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 763 | 556
Consumer: | Consumer other | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | 46,389 | 47,543
Lease financing |  |
Aging Status of recorded investment |  |
Loans | 310,983 | 391,390
Nonaccrual | 7,364 | 8,132
Lease financing | Performing |  |
Aging Status of recorded investment |  |
Loans | 303,619 | 383,258
Lease financing | Nonperforming |  |
Aging Status of recorded investment |  |
Loans | 7,364 | 8,132
Nonaccrual | 7,364 | 8,132
Lease financing | 30-59 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 4,522 | 4,679
Lease financing | 60-89 days past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 1,478 | 3,754
Lease financing | Past due 90 days or more | Performing |  |
Aging Status of recorded investment |  |
Loans | 0 | 0
Lease financing | Total past due | Performing |  |
Aging Status of recorded investment |  |
Loans | 6,000 | 8,433
Lease financing | Current | Performing |  |
Aging Status of recorded investment |  |
Loans | $ 297,619 | $ 374,825

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 13: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 14: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 15: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 16: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 17: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
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: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_CommercialOtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_CommercialRealEstateNonOwnerOccupiedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_CommercialRealEstateOwnerOccupiedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_FarmlandLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_ConstructionAndLandDevelopmentLoanMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_OtherResidentialLoansMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=msbi_OtherConsumerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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