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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |  |  |  |  |
Loss on cash flow hedges to be recognized within twelve months | $ 1,900 |  |  |  |  |  |  |
Credit enhancement asset | $ 16,804 | $ 20,633 | $ 18,202 | $ 16,369 | $ 15,389 | $ 15,111 | $ 14,720 | $ 13,959

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- Definition Credit Enhancement, Asset + References No definition available. + Details
Name: | msbi_CreditEnhancementAsset
Namespace Prefix: | msbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
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_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration