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LOANS - Impaired Loans with Interest Recognized (Details) - USD ($)	3 Months Ended		9 Months Ended
	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

X

- 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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LoanAndLeaseReceivablesImpairedAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration