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LOANS - Impaired Loans with Interest Recognized (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Interest income : |  |  |  |
Interest income recognized on nonaccrual loans | $ 0 | $ 0 | $ 0 | $ 0
Financing receivable, individually evaluated for credit loss, interest income | $ 2,500,000 | $ 2,700,000 | $ 9,300,000 | $ 6,300,000

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- Definition Financing Receivable, Individually Evaluated for Credit Loss, Interest Income + References No definition available. + Details
Name: | msbi_FinancingReceivableIndividuallyEvaluatedForCreditLossInterestIncome
Namespace Prefix: | msbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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