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DEPOSITS - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Deposits [Abstract] |  |
Time deposits $250,000 or more | $ 166.8 | $ 179.2

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 and over. + References No definition available. + Details
Name: | msbi_TimeDeposits250000OrMore
Namespace Prefix: | msbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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