$MSBI
Midland States Bancorp Inc Stock $msbi

$msbi Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000146602622000003 Filed on February 25, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue
YoY Change
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.500M	$5.500M	$3.900M
YoY Change	-10.26%	-20.29%	-7.14%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$30.14M	$9.196M
YoY Change		-34.12%	-41.64%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$30.60M	$99.11M	$10.75M
YoY Change	184.76%	209.59%	-33.13%
Income Tax	$7.490M	$17.80M	$2.413M
% Of Pretax Income	24.48%	17.95%	22.45%
Net Earnings	$23.11M	$81.32M	$8.333M
YoY Change	177.33%	260.82%	-34.86%
Net Earnings / Revenue
Basic Earnings Per Share		$3.58	$0.36
Diluted Earnings Per Share	$1.034M	$3.57	$0.36
COMMON SHARES
Basic Shares Outstanding	22.02M shares	22.48M shares	22.47M shares
Diluted Shares Outstanding		22.55M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.587B		$1.018B
YoY Change	55.84%		-2.45%
Cash & Equivalents	$680.4M		$341.6M
Short-Term Investments	$906.6M		$676.7M
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$79.22M	$79.20M	$74.12M
YoY Change	6.87%	-4.92%	-18.59%
Goodwill	$161.9M		$161.9M
YoY Change	0.0%		-5.74%
Intangibles	$24.37M		$28.38M
YoY Change	-14.12%		-18.64%
Long-Term Investments	$36.30M	$36.30M	$56.60M
YoY Change	-35.87%	-35.87%	27.19%
Other Assets		$2.300M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$7.444B	$7.444B	$6.869B
YoY Change	8.38%	8.38%	12.84%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$10.70M	$10.70M	$12.00M
YoY Change	-10.83%	-10.83%	-22.08%
Deferred Revenue
YoY Change
Short-Term Debt	$76.80M	$76.80M	$68.96M
YoY Change	11.38%	11.3%	-15.94%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$10.70M	$10.70M	$12.00M
YoY Change	-10.83%	-10.83%	-44.95%
LONG-TERM LIABILITIES
Long-Term Debt	$188.5M	$188.5M	$218.6M
YoY Change	-13.77%	-13.77%	-2.8%
Other Long-Term Liabilities	$83.20M	$83.20M	$67.40M
YoY Change	23.44%	23.44%	41.89%
Total Long-Term Liabilities	$271.7M	$271.7M	$286.0M
YoY Change	-5.0%	-5.0%	4.99%
TOTAL LIABILITIES
Total Short-Term Liabilities	$10.70M	$10.70M	$12.00M
Total Long-Term Liabilities	$271.7M	$271.7M	$286.0M
Total Liabilities	$6.780B	$6.780B	$6.247B
YoY Change	8.53%	8.53%	15.15%
SHAREHOLDERS EQUITY
Retained Earnings	$212.5M		$156.3M
YoY Change	35.92%		-5.78%
Common Stock	$221.0K		$223.0K
YoY Change	-0.9%		-8.61%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$663.8M	$663.8M	$621.4M
YoY Change
Total Liabilities & Shareholders Equity	$7.444B	$7.444B	$6.869B
YoY Change	8.38%	8.38%	12.84%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$23.11M	$81.32M	$8.333M
YoY Change	177.33%	260.82%	-34.86%
Depreciation, Depletion And Amortization	$3.500M	$5.500M	$3.900M
YoY Change	-10.26%	-20.29%	-7.14%
Cash From Operating Activities	$33.30M	$334.4M	$93.20M
YoY Change	-64.27%	-33.0%	-78.66%
INVESTING ACTIVITIES
Capital Expenditures	-$800.0K	$2.718M	-$600.0K
YoY Change	33.33%	4.98%	-57.14%
Acquisitions		$2.715M
YoY Change
Other Investing Activities	-$392.5M	-$475.8M	-$369.1M
YoY Change	6.34%	-63.67%	-11.74%
Cash From Investing Activities	-$393.3M	-$478.5M	-$369.7M
YoY Change	6.38%	-63.54%	-11.89%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$11.69M
YoY Change		-70.49%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	377.7M	$482.8M	156.8M
YoY Change	140.88%	-36.51%	-590.0%
NET CHANGE
Cash From Operating Activities	33.30M	$334.4M	93.20M
Cash From Investing Activities	-393.3M	-$478.5M	-369.7M
Cash From Financing Activities	377.7M	$482.8M	156.8M
Net Change In Cash	17.70M	$338.7M	-119.7M
YoY Change	-114.79%	-740.75%	708.78%
FREE CASH FLOW
Cash From Operating Activities	$33.30M	$334.4M	$93.20M
Capital Expenditures	-$800.0K	$2.718M	-$600.0K
Free Cash Flow	$34.10M	$331.7M	$93.80M
YoY Change	-63.65%	-33.2%	-78.59%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity File Number EntityFileNumber	001-35272
CY2021	dei	Entity Registrant Name EntityRegistrantName	MIDLAND STATES BANCORP, INC.
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001466026
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	IL
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	37-1233196
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	1201 Network Centre Drive
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	62401
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Effingham
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2021	dei	City Area Code CityAreaCode	217
CY2021	dei	Local Phone Number LocalPhoneNumber	342-7321
CY2021	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2021	dei	Trading Symbol TradingSymbol	MSBI
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	566736176	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	22031410	shares
CY2021	dei	Auditor Firm AuditorFirmId	173
CY2021	dei	Auditor Name AuditorName	Crowe LLP
CY2021	dei	Auditor Location AuditorLocation	Indianapolis, Indiana
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CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	337080000	USD
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CY2020Q4	us-gaap	Federal Funds Sold FederalFundsSold	4560000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	680371000	USD
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CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	9529000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	9424000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	5224801000	USD
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CY2020Q4	msbi	Non Marketable Equity Securities NonMarketableEquitySecurities	56596000	USD
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CY2021Q4	us-gaap	Liabilities Liabilities	6779968000	USD
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CY2020	msbi	Provision For Credit Losses On Unfunded Commitments ProvisionForCreditLossesOnUnfundedCommitments	846000	USD
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CY2021	msbi	Wealth Management Revenue WealthManagementRevenue	26811000	USD
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CY2021	msbi	Fees And Commissions Mortgage Banking And Servicing And Other Commercial FeesAndCommissionsMortgageBankingAndServicingAndOtherCommercial	1414000	USD
CY2020	msbi	Fees And Commissions Mortgage Banking And Servicing And Other Commercial FeesAndCommissionsMortgageBankingAndServicingAndOtherCommercial	6007000	USD
CY2019	msbi	Fees And Commissions Mortgage Banking And Servicing And Other Commercial FeesAndCommissionsMortgageBankingAndServicingAndOtherCommercial	15309000	USD
CY2021	msbi	Fees And Commissions Mortgage Banking And Servicing And Other Residential FeesAndCommissionsMortgageBankingAndServicingAndOtherResidential	5526000	USD
CY2020	msbi	Fees And Commissions Mortgage Banking And Servicing And Other Residential FeesAndCommissionsMortgageBankingAndServicingAndOtherResidential	9812000	USD
CY2019	msbi	Fees And Commissions Mortgage Banking And Servicing And Other Residential FeesAndCommissionsMortgageBankingAndServicingAndOtherResidential	2928000	USD
CY2021	msbi	Commissions And Fees Income From Depositor Accounts CommissionsAndFeesIncomeFromDepositorAccounts	8348000	USD
CY2020	msbi	Commissions And Fees Income From Depositor Accounts CommissionsAndFeesIncomeFromDepositorAccounts	8603000	USD
CY2019	msbi	Commissions And Fees Income From Depositor Accounts CommissionsAndFeesIncomeFromDepositorAccounts	11027000	USD
CY2021	msbi	Fees And Commissions From Debit Cards FeesAndCommissionsFromDebitCards	14500000	USD
CY2020	msbi	Fees And Commissions From Debit Cards FeesAndCommissionsFromDebitCards	12266000	USD
CY2019	msbi	Fees And Commissions From Debit Cards FeesAndCommissionsFromDebitCards	11992000	USD
CY2021	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	537000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1721000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	674000	USD
CY2021	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	7532000	USD
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	12337000	USD
CY2019	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	2139000	USD
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4496000	USD
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3581000	USD
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3640000	USD
CY2021	us-gaap	Noninterest Income Other NoninterestIncomeOther	15799000	USD
CY2020	us-gaap	Noninterest Income Other NoninterestIncomeOther	8794000	USD
CY2019	us-gaap	Noninterest Income Other NoninterestIncomeOther	10019000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	69899000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	61249000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	75282000	USD
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	86883000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	85557000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	91906000	USD
CY2021	us-gaap	Occupancy Net OccupancyNet	14866000	USD
CY2020	us-gaap	Occupancy Net OccupancyNet	17552000	USD
CY2019	us-gaap	Occupancy Net OccupancyNet	18811000	USD
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	24595000	USD
CY2020	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	22643000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	21390000	USD
CY2021	us-gaap	Professional Fees ProfessionalFees	10971000	USD
CY2020	us-gaap	Professional Fees ProfessionalFees	7234000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	8783000	USD
CY2021	us-gaap	Marketing Expense MarketingExpense	3239000	USD
CY2020	us-gaap	Marketing Expense MarketingExpense	3498000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	3927000	USD
CY2021	us-gaap	Communication Communication	3002000	USD
CY2020	us-gaap	Communication Communication	4052000	USD
CY2019	us-gaap	Communication Communication	3693000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5855000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6504000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7090000	USD
CY2021	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	12847000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	3577000	USD
CY2021	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	8536000	USD
CY2020	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	4872000	USD
CY2019	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	0	USD
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	17122000	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19251000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16464000	USD
CY2021	us-gaap	Noninterest Expense NoninterestExpense	175069000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	184010000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	175641000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	99112000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32014000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	72471000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17795000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	81317000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2021	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	0	USD
CY2020	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	0	USD
CY2019	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	46000	USD
CY2021	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	81317000	USD
CY2020	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	22537000	USD
CY2019	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	55738000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.58
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.28
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.57
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.26
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	22481389	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23336881	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24288793	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	22547353	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	23346126	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24493431	shares
CY2021	us-gaap	Net Income Loss NetIncomeLoss	81317000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-12553000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6454000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	13847000	USD
CY2021	msbi	Other Comprehensive Income Loss Provision For Recapture Of Credit Loss OtherComprehensiveIncomeLossProvisionForRecaptureOfCreditLoss	-145000	USD
CY2020	msbi	Other Comprehensive Income Loss Provision For Recapture Of Credit Loss OtherComprehensiveIncomeLossProvisionForRecaptureOfCreditLoss	366000	USD
CY2019	msbi	Other Comprehensive Income Loss Provision For Recapture Of Credit Loss OtherComprehensiveIncomeLossProvisionForRecaptureOfCreditLoss	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	537000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1721000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	674000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-3640000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1402000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3623000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-9595000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3697000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	9550000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	6851000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	403000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	2159000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	1291000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	111000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	3401000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	292000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6194000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3989000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9550000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	75123000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	26526000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65334000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	608525000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9550000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	10339000	USD
CY2019	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	191000	USD
CY2019	msbi	Preferred Stock Premium Amortization PreferredStockPremiumAmortization	0	USD
CY2019	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	2636000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.97
CY2019	msbi	Dividends Common Stock And Share Based Compensation DividendsCommonStockAndShareBasedCompensation	23599000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	4019000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2364000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	5794000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	661911000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3989000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.07
CY2020	msbi	Dividends Common Stock And Share Based Compensation DividendsCommonStockAndShareBasedCompensation	24958000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	39615000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2175000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	2524000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	621391000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	81317000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6194000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.12
CY2021	msbi	Dividends Common Stock And Share Based Compensation DividendsCommonStockAndShareBasedCompensation	25172000	USD
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	11692000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1938000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	2249000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	663837000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	81317000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3393000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44361000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	16985000	USD
CY2021	us-gaap	Depreciation Depreciation	5506000	USD
CY2020	us-gaap	Depreciation Depreciation	6942000	USD
CY2019	us-gaap	Depreciation Depreciation	6583000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5855000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6504000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7090000	USD
CY2021	msbi	Amortization Of Operating Lease Right Of Use Asset AmortizationOfOperatingLeaseRightOfUseAsset	1742000	USD
CY2020	msbi	Amortization Of Operating Lease Right Of Use Asset AmortizationOfOperatingLeaseRightOfUseAsset	2547000	USD
CY2019	msbi	Amortization Of Operating Lease Right Of Use Asset AmortizationOfOperatingLeaseRightOfUseAsset	2937000	USD
CY2021	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	3242000	USD
CY2020	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	3518000	USD
CY2019	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	2820000	USD
CY2021	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	1938000	USD
CY2020	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	2175000	USD
CY2019	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	2364000	USD
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3451000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3581000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3640000	USD
CY2021	msbi	Gain On Proceeds From Life Insurance Corporate Or Bank Owned GainOnProceedsFromLifeInsuranceCorporateOrBankOwned	1045000	USD
CY2020	msbi	Gain On Proceeds From Life Insurance Corporate Or Bank Owned GainOnProceedsFromLifeInsuranceCorporateOrBankOwned	0	USD
CY2019	msbi	Gain On Proceeds From Life Insurance Corporate Or Bank Owned GainOnProceedsFromLifeInsuranceCorporateOrBankOwned	0	USD
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4196000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3411000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3757000	USD
CY2021	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	537000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1721000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	674000	USD
CY2021	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2159000	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	USD
CY2021	msbi	Gains Losses On Sales Of Other Real Estate Excluding Write Downs GainsLossesOnSalesOfOtherRealEstateExcludingWriteDowns	473000	USD
CY2020	msbi	Gains Losses On Sales Of Other Real Estate Excluding Write Downs GainsLossesOnSalesOfOtherRealEstateExcludingWriteDowns	78000	USD
CY2019	msbi	Gains Losses On Sales Of Other Real Estate Excluding Write Downs GainsLossesOnSalesOfOtherRealEstateExcludingWriteDowns	185000	USD
CY2021	msbi	Write Down Of Other Real Estate Owned WriteDownOfOtherRealEstateOwned	454000	USD
CY2020	msbi	Write Down Of Other Real Estate Owned WriteDownOfOtherRealEstateOwned	1390000	USD
CY2019	msbi	Write Down Of Other Real Estate Owned WriteDownOfOtherRealEstateOwned	16000	USD
CY2021	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	504801000	USD
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	786203000	USD
CY2019	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	504973000	USD
CY2021	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	739954000	USD
CY2020	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	1218950000	USD
CY2019	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	949745000	USD
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4952000	USD
CY2020	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	14071000	USD
CY2019	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	15082000	USD
CY2021	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	7532000	USD
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	12337000	USD
CY2019	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	2139000	USD
CY2021	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	12847000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	3577000	USD
CY2021	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-4075000	USD
CY2020	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	7199000	USD
CY2019	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-1399000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	31974000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	30269000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5191000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	24626000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4750000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	13202000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	334438000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	499147000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	538653000	USD
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	469789000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	266514000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	200231000	USD
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	14777000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28256000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	33464000	USD
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	208377000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	214036000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	239760000	USD
CY2021	msbi	Equity Securities Fvni Purchases EquitySecuritiesFvniPurchases	260000	USD
CY2020	msbi	Equity Securities Fvni Purchases EquitySecuritiesFvniPurchases	3345000	USD
CY2019	msbi	Equity Securities Fvni Purchases EquitySecuritiesFvniPurchases	82000	USD
CY2021	msbi	Equity Securities Fv Ni Sales EquitySecuritiesFvNiSales	0	USD
CY2020	msbi	Equity Securities Fv Ni Sales EquitySecuritiesFvNiSales	0	USD
CY2019	msbi	Equity Securities Fv Ni Sales EquitySecuritiesFvNiSales	105000	USD
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	258401000	USD
CY2020	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1279913000	USD
CY2019	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	505501000	USD
CY2021	msbi	Proceeds From Sale Of Commercial Fha Origination Platform ProceedsFromSaleOfCommercialFHAOriginationPlatform	0	USD
CY2020	msbi	Proceeds From Sale Of Commercial Fha Origination Platform ProceedsFromSaleOfCommercialFHAOriginationPlatform	7502000	USD
CY2019	msbi	Proceeds From Sale Of Commercial Fha Origination Platform ProceedsFromSaleOfCommercialFHAOriginationPlatform	0	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2718000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2589000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5538000	USD
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	647000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2021	msbi	Payments To Acquire Nonmarketable Equity Securities PaymentsToAcquireNonmarketableEquitySecurities	0	USD
CY2020	msbi	Payments To Acquire Nonmarketable Equity Securities PaymentsToAcquireNonmarketableEquitySecurities	12091000	USD
CY2019	msbi	Payments To Acquire Nonmarketable Equity Securities PaymentsToAcquireNonmarketableEquitySecurities	14263000	USD
CY2021	msbi	Proceeds From Sale Of Nonmarketable Equity Securities ProceedsFromSaleOfNonmarketableEquitySecurities	20255000	USD
CY2020	msbi	Proceeds From Sale Of Nonmarketable Equity Securities ProceedsFromSaleOfNonmarketableEquitySecurities	0	USD
CY2019	msbi	Proceeds From Sale Of Nonmarketable Equity Securities ProceedsFromSaleOfNonmarketableEquitySecurities	12684000	USD
CY2021	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	USD
CY2020	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	USD
CY2019	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	3288000	USD
CY2021	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	9210000	USD
CY2020	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	2225000	USD
CY2019	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1647000	USD
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	550000	USD
CY2020	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	USD
CY2019	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	USD
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2672000	USD
CY2020	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2715000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-69879000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-478495000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1312433000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-364788000	USD
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1009632000	USD
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	556762000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	148344000	USD
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	7846000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-13072000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-42206000	USD
CY2021	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	500000000	USD
CY2020	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	729000000	USD
CY2019	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	360000000	USD
CY2021	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	977536000	USD
CY2020	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	447832000	USD
CY2019	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	515047000	USD
CY2021	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	8536000	USD
CY2020	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	4872000	USD
CY2019	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	0	USD
CY2021	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	98265000	USD
CY2021	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	31075000	USD
CY2020	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	7443000	USD
CY2019	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	19543000	USD
CY2021	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	0	USD
CY2020	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	193000	USD
CY2019	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	1778000	USD
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	191000	USD
CY2021	msbi	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	0	USD
CY2020	msbi	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	10000	USD
CY2019	msbi	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	2636000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	25172000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	24958000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23599000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	11692000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	39615000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4019000	USD
CY2021	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	2249000	USD
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	2524000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	5794000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	482788000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	760421000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	6940000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	338731000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-52865000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	180805000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	341640000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	394505000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	213700000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	680371000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	341640000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	394505000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	31735000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	47712000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	58158000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7759000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2977000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	479000	USD
CY2021	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	123117000	USD
CY2020	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	542060000	USD
CY2019	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	419215000	USD
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	805000	USD
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	16736000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	3819000	USD
CY2021	msbi	Transfer Of Premises And Equipment To Assets Held For Sale TransferOfPremisesAndEquipmentToAssetsHeldForSale	23000	USD
CY2020	msbi	Transfer Of Premises And Equipment To Assets Held For Sale TransferOfPremisesAndEquipmentToAssetsHeldForSale	11344000	USD
CY2019	msbi	Transfer Of Premises And Equipment To Assets Held For Sale TransferOfPremisesAndEquipmentToAssetsHeldForSale	4350000	USD
CY2021	msbi	Transfer Of Mortgage Servicing Rights To Mortgage Servicing Rights Held For Sale TransferOfMortgageServicingRightsToMortgageServicingRightsHeldForSale	705000	USD
CY2020	msbi	Transfer Of Mortgage Servicing Rights To Mortgage Servicing Rights Held For Sale TransferOfMortgageServicingRightsToMortgageServicingRightsHeldForSale	0	USD
CY2019	msbi	Transfer Of Mortgage Servicing Rights To Mortgage Servicing Rights Held For Sale TransferOfMortgageServicingRightsToMortgageServicingRightsHeldForSale	0	USD
CY2021Q4	msbi	Interest Receivable From Loans InterestReceivableFromLoans	15900000	USD
CY2020Q4	msbi	Interest Receivable From Loans InterestReceivableFromLoans	19900000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Policy For Uncollectible Amounts FinancingReceivableAllowanceForCreditLossesPolicyForUncollectibleAmounts	<div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Allowance for Credit Losses on Loans</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company adopted the current expected credit loss model under Accounting Standards Update (“ASU”) 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”) on January 1, 2020 using the modified retrospective approach. Results for the periods beginning after January 1, 2020 are presented under ASU 2016-13 while prior period amounts are reported in accordance with the incurred loss model under previously applicable U.S. GAAP. The transition adjustment included an increase in the allowance for credit losses on loans of $12.8 million and an increase in the allowance on unfunded commitments of $0.3 million.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The allowance for credit losses on loans is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. The amount of the allowance represents management's best estimate of current expected credit losses on loans considering available information, from internal and external sources, relevant to assessing collectibility over the loans' contractual terms, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals, and modifications. unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Management estimates the allowance balance using relevant information, from internal and external sources, relating to historical credit loss experience, current conditions, and reasonable and supportable forecasts. While historical credit loss experience provides the basis for the estimation of expected credit losses, adjustments to historical loss information may be made for differences in current loan-specific risk characteristics, environmental conditions or other relevant factors. Allowance for credit losses on loans is measured on a collective basis and reflects impairment in groups of loans aggregated on the basis of similar risk characteristics. Loans that do not share risk characteristics are evaluated for expected credit losses on an individual basis and excluded from the collective evaluation. Expected credit losses for collateral dependent loans, including loans where the borrower is experiencing financial difficulty but foreclosure is not probable, are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Credit loss expense related to loans reflects the totality of actions taken on all loans for a particular period including any necessary increases or decreases in the allowance related to changes in credit loss expectations associated with specific loans or pools of loans. Portions of the allowance may be allocated for specific credits; however, the entire allowance is available for any credit that, in management’s judgment, should be charged-off. While management utilizes its best judgment and information available, the ultimate appropriateness of the allowance is dependent upon a variety of factors beyond our control, including the performance of our loan portfolio, the economy, changes in interest rates and the view of the regulatory authorities toward loan classifications.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In calculating the allowance for credit losses, most loans are segmented into pools based upon similar characteristics and risk profiles. Common characteristics and risk profiles may include internal credit ratings, risk ratings or classification, financial asset type, collateral type, size, industry of the borrower, historical or expected credit loss patterns, and reasonable and supportable forecast periods. For modeling purposes, our loan pools include (i) commercial, (ii) commercial real estate, (iii) construction and land development, (iv) residential real estate, (v) consumer, and (vi) lease financing. We periodically reassess each pool to ensure the loans within the pool continue to share similar characteristics and risk profiles and to determine whether further segmentation is necessary.</span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The table below identifies the Company’s loan portfolio segments and classes.</span></div><div style="margin-bottom:7pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:37.350%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:4.163%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:55.187%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Segment</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:100%">Class</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Commercial</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Commercial</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Commercial Other</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Commercial Real Estate</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Commercial Real Estate Non-Owner Occupied</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Commercial Real Estate Owner Occupied</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Multi-Family</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Farmland</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Construction and Land Development</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Construction and Land Development</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Residential Real Estate</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Residential First Lien</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Other Residential</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Consumer</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Consumer</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Consumer Other</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Lease Financing</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Lease Financing</span></td></tr></table></div><div style="margin-bottom:12pt;margin-top:4pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">For each loan pool, we measure expected credit losses over the life of each loan utilizing a combination of models which measure (i) probability of default (“PD”), which is the likelihood that loan will stop performing or default, (ii) loss given default (“LGD”), which is the expected loss rate for loans in default, (iii) assumed prepayment speed, which is the likelihood that a loan will prepay or pay-off prior to maturity, and (iv) exposure at default (“EAD”), which is the estimated outstanding principal balance of the loans upon default, including the expected funding of unfunded commitments outstanding as of the </span></div><div style="margin-bottom:12pt;margin-top:4pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">measurement date. For certain commercial loan portfolios, the PD is calculated using a transition matrix to determine the likelihood of a customer’s risk grade migrating from one specified range of risk grades to a different specified range. Expected credit losses are calculated as the product of PD (adjusted for prepayment), LGD and EAD. This methodology builds on default probabilities already incorporated into our risk grading process by utilizing pool-specific historical loss rates to calculate expected credit losses. These pool-specific historical loss rates may be adjusted for current macroeconomic assumptions, as further discussed below, and other factors such as differences in underwriting standards, portfolio mix, or when historical asset terms do not reflect the contractual terms of the financial assets being evaluated as of the measurement date. Each time we measure expected credit losses, we assess the relevancy of historical loss information and consider any necessary adjustments to address any differences in asset-specific characteristics. </span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The measurement of expected credit losses is impacted by loan and borrower attributes and certain macroeconomic variables. Significant loan and borrower attributes utilized in our modeling processes include, among other things, (i) origination date, (ii) maturity date, (iii) payment type, (iv) collateral type and amount, (v) current risk grade, (vi) current unpaid balance and commitment utilization rate, (vii) payment status and delinquency history and (viii) expected recoveries of previously charged-off amounts. Significant macroeconomic variables utilized in our modeling processes include, among other things, (i) US and Illinois Disposable Income and Gross Domestic Product, (ii) selected market interest rates including U.S. Treasury rates and government bond rates, (iii) Consumer Price Index, (iv) commercial and residential property prices in Illinois and the US as a whole, and (v) Illinois Housing Starts and Retail Sales for the State of Illinois and US.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The probability of default and prepayment assumptions were estimated by analyzing internally-sourced data related to historical performance of each loan pool. They are adjusted to reflect the current impact of certain macroeconomic variables as well as their expected changes over a reasonable and supportable forecast period. We have determined that we are reasonably able to forecast the macroeconomic variables used in our modeling processes with an acceptable degree of confidence for a total of two years with the last twelve months of the forecast period encompassing a reversion process whereby the forecasted macroeconomic variables are reverted to their historical mean utilizing a straight line basis. The macroeconomic variables utilized as inputs in our modeling processes were subjected to a variety of analysis procedures and were selected primarily based on statistical relevancy and correlation to our historical credit losses. By reverting these modeling inputs to their historical mean and considering loan and borrower specific attributes, our models are intended to yield a measurement of expected credit losses that reflects our average historical loss rates for periods subsequent to the twelve-month reversion period. The LGD is based on historical recovery averages for each loan pool, adjusted to reflect the current impact of certain macroeconomic variables as well as their expected changes over a two-year forecast period, with the final twelve months of the forecast period encompassing a reversion process, which management considers to be both reasonable and supportable. The same forecast and reversion periods are used for all macroeconomic variables in our models. </span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Management qualitatively adjusts model results for risk factors that are not considered within our modeling processes but are nonetheless relevant in assessing the expected credit losses within our loan pools. These qualitative factor (“Q-Factor”) adjustments may increase or decrease management's estimate of expected credit losses by a calculated percentage or amount based upon the estimated level of risk. The various risks that may be considered in making Q-Factor adjustments include, among other things, the impact of (i) changes in lending policies and procedures, including changes in underwriting standards and practices for collections, write-offs, and recoveries, (ii) actual and expected changes in economic and business conditions and developments that affect the collectibility of the loan pools, (iii) changes in the nature and volume of the loan pools and in the terms of the underlying loans, (iv) changes in the experience, ability, and depth of our lending management and staff, (v) changes in volume and severity of past due financial assets, the volume of non-accrual assets, and the volume and severity of adversely classified or graded assets, (vi) changes in the quality of our credit review function, (vii) changes in the value of the underlying collateral for loans that are non-collateral dependent, (viii) the existence, growth, and effect of any concentrations of credit and (ix) other factors such as the regulatory, legal and technological environments; competition; and events such as natural disasters or health pandemics.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In some cases, management may determine that an individual loan exhibits unique risk characteristics which differentiate the loan from other loans within our loan pools. In such cases, the loans are evaluated for expected credit losses on an individual basis and excluded from the collective evaluation. Specific allocations of the allowance for credit losses are determined by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies, the relative risk grade of the loan and economic conditions affecting the borrower’s industry, among other things. A loan is considered to be collateral dependent when, based upon management's assessment, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. In such cases, expected credit losses are based on the fair value of the collateral at the measurement date, adjusted for estimated selling costs if satisfaction of the loan depends on the sale of the collateral. We reevaluate the fair value of collateral supporting collateral dependent loans on a quarterly basis. </span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> Specific reserves reflect expected credit losses on loans identified for evaluation or individually considered nonperforming. These loans no longer have similar risk characteristics to collectively evaluated loans due to changes in credit </span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">risk, borrower circumstances, recognition of write-offs, or cash collections that have been fully applied to principal on the basis of nonaccrual policies. At a minimum, the population of loans subject to individual evaluation include individual loans where it is probable we will be unable to collect all amounts due, according to the original contractual terms. These include, nonaccrual loans with a balance greater than $500,000, accruing loans 90 days past due or greater with a balance greater than $100,000, specialty lending relationships and other loans as determined by management. Allowance for credit losses for consumer and residential loans are, primarily, determined by meaningful pools of similar loans and are evaluated on a quarterly basis.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The provision for credit losses on loans individually evaluated is recognized on the basis of the present value of expected future cash flows discounted at the effective interest rate, the fair value of collateral adjusted for estimated costs to sell, or the observable market price as of the relevant date. Allowance for credit losses on loans adjustments for estimated costs to sell are not appropriate when the repayment of the collateral-dependent loan is expected from the operation of the collateral.</span></div>
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	12800000	USD
CY2020Q1	msbi	Unused Commitments To Extend Credit Period Increase Decrease UnusedCommitmentsToExtendCreditPeriodIncreaseDecrease	300000	USD
CY2021Q4	msbi	Loans And Lease Receivables Probability Of Default Non Accrual Loans Threshold Balance Minimum LoansAndLeaseReceivablesProbabilityOfDefaultNonAccrualLoansThresholdBalanceMinimum	500000	USD
CY2021Q4	msbi	Loans And Lease Receivables Probability Of Default Accrual Loans90 Days Due Threshold Balance Minimum LoansAndLeaseReceivablesProbabilityOfDefaultAccrualLoans90DaysDueThresholdBalanceMinimum	100000	USD
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Allowance for Credit Losses on Unfunded Commitments</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In the ordinary course of business, the Company has entered into credit-related financial instruments consisting of commitments to extend credit, commercial letters of credit and standby letters of credit. The notional amount of these commitments is not reflected in the consolidated financial statements until they are funded.</span></div><div style="margin-bottom:12pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on unfunded commitments is adjusted as a provision for credit loss expense on the consolidated income statement. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. Expected utilization rates are compared to the current funded portion of the total commitment amount as a practical expedient for funded exposure at default. The allowance for credit losses on unfunded commitments totaled $1.9 million and $2.4 million at December 31, 2021 and 2020, respectively.</span></div>
CY2021Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	1900000	USD
CY2020Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	2400000	USD
CY2021Q4	msbi	Required Cash Reserve RequiredCashReserve	0	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	904695000	USD
CY2021	us-gaap	Available For Sale Debt Securities Gross Unrealized Gain AvailableForSaleDebtSecuritiesGrossUnrealizedGain	11505000	USD
CY2021	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	9376000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	221000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	906603000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	661713000	USD
CY2020	us-gaap	Available For Sale Debt Securities Gross Unrealized Gain AvailableForSaleDebtSecuritiesGrossUnrealizedGain	16510000	USD
CY2020	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	1146000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	366000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	676711000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	9877000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	9976000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	137694000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	139456000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	244626000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	248197000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	38977000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	39998000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	473521000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	468976000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	904695000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	906603000	USD
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	14777000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28256000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	33464000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	537000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1721000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	786000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	190000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	366000	USD
CY2021	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	-145000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	221000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	366000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	366000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	451195000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	7977000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	21021000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	932000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	472216000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	8909000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	56085000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	666000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	56085000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	666000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	113	security
CY2021Q4	msbi	Available For Sale Securities In Unrealized Loss Positions Aggregate Depreciation Percentage AvailableForSaleSecuritiesInUnrealizedLossPositionsAggregateDepreciationPercentage	0.0185
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	9500000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	9400000	USD
CY2021	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	0	USD
CY2020	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	0	USD
CY2019	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	105000	USD
CY2021	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	0	USD
CY2020	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	0	USD
CY2019	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	78000	USD
CY2021	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	0	USD
CY2020	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	0	USD
CY2019	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	0	USD
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	361000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	577000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	93000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	5224801000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	5103331000	USD
CY2021Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	4600000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	700000	USD
CY2021Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	46100000	USD
CY2020Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	46500000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	138100000	USD
CY2021Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	32000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	60443000	USD
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	3950000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	15420000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2089000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	51062000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	28028000	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	43149000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	25454000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1937000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	60443000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	20903000	USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	16985000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	12068000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2208000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	28028000	USD
CY2021Q4	msbi	Loans And Lease Receivables Probability Of Default Non Accrual Loans Threshold Balance Minimum LoansAndLeaseReceivablesProbabilityOfDefaultNonAccrualLoansThresholdBalanceMinimum	500000	USD
CY2021Q4	msbi	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	19237000	USD
CY2021Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	16326000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	35563000	USD
CY2020Q4	msbi	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	38489000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	11139000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	49628000	USD
CY2021Q1	us-gaap	Financing Receivable Purchased With Credit Deterioration Amount At Par Value FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue	9800000	USD
CY2021	us-gaap	Loans And Leases Receivable Impaired Interest Income Recognized Change In Present Value Attributable To Passage Of Time LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime	0	USD
CY2019	us-gaap	Loans And Leases Receivable Impaired Interest Income Recognized Change In Present Value Attributable To Passage Of Time LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime	0	USD
CY2020	us-gaap	Loans And Leases Receivable Impaired Interest Income Recognized Change In Present Value Attributable To Passage Of Time LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime	0	USD
CY2021	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2700000	USD
CY2020	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	3300000	USD
CY2019	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2200000	USD
CY2020	msbi	Loans And Leases Receivable Impaired Troubled Debt Interest Income Recognized LoansAndLeasesReceivableImpairedTroubledDebtInterestIncomeRecognized	100000	USD
CY2021	msbi	Loans And Leases Receivable Impaired Troubled Debt Interest Income Recognized LoansAndLeasesReceivableImpairedTroubledDebtInterestIncomeRecognized	100000	USD
CY2019	msbi	Loans And Leases Receivable Impaired Troubled Debt Interest Income Recognized LoansAndLeasesReceivableImpairedTroubledDebtInterestIncomeRecognized	100000	USD
CY2021Q4	msbi	Collateral Dependent Loans CollateralDependentLoans	20813000	USD
CY2020Q4	msbi	Collateral Dependent Loans CollateralDependentLoans	18973000	USD
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	5224801000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	5103331000	USD
CY2021Q4	msbi	Financing Receivable Modifications Recorded Investment Accruing FinancingReceivableModificationsRecordedInvestmentAccruing	7012000	USD
CY2021Q4	msbi	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	5749000	USD
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	12761000	USD
CY2020Q4	msbi	Financing Receivable Modifications Recorded Investment Accruing FinancingReceivableModificationsRecordedInvestmentAccruing	2901000	USD
CY2020Q4	msbi	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	9524000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	12425000	USD
CY2021	us-gaap	Financing Receivable Change In Method Credit Loss Expense Reversal FinancingReceivableChangeInMethodCreditLossExpenseReversal	700000	USD
CY2020	us-gaap	Financing Receivable Change In Method Credit Loss Expense Reversal FinancingReceivableChangeInMethodCreditLossExpenseReversal	800000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	45	loan
CY2021	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6302000	USD
CY2021	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	5954000	USD
CY2020	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	37	loan
CY2020	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	5164000	USD
CY2020	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	4455000	USD
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	37	loan
CY2019	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	3897000	USD
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	3140000	USD
CY2021	msbi	Number Of Main Regions NumberOfMainRegions	4	region
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	116384000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	115292000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	45592000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	41168000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	70792000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	74124000	USD
CY2021	us-gaap	Depreciation Depreciation	5500000	USD
CY2020	us-gaap	Depreciation Depreciation	6900000	USD
CY2019	us-gaap	Depreciation Depreciation	6600000	USD
CY2020Q4	msbi	Restructuring And Related Cost Number Of Stores Eliminated RestructuringAndRelatedCostNumberOfStoresEliminated	13	branch
CY2020Q4	msbi	Percentage Of Branch Network Closed PercentageOfBranchNetworkClosed	0.20
CY2020Q4	msbi	Restructuring And Related Cost Area Of Office Space To Be Vacated RestructuringAndRelatedCostAreaOfOfficeSpaceToBeVacated	23000	sqft
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	12700000	USD
CY2019Q3	msbi	Number Of Banking Facilities To Be Closed To Homestar NumberOfBankingFacilitiesToBeClosedToHomestar	1	facility
CY2019Q4	msbi	Number Of Banking Facilities To Be Consolidated To Home Star Banking Facilities NumberOfBankingFacilitiesToBeConsolidatedToHomeStarBankingFacilities	2	facility
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q3	msbi	Number Of Banking Facilities To Be Consolidated To Footprint NumberOfBankingFacilitiesToBeConsolidatedToFootprint	3	facility
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1118000	USD
CY2020Q1	msbi	Number Of Banking Facilities To Be Closed To Homestar NumberOfBankingFacilitiesToBeClosedToHomestar	2	facility
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3200000	USD
CY2021Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	2300000	USD
CY2020Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	4200000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8400000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	9200000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10700000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	12000000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	2400000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P10Y
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	2080000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	2943000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	2566000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3280000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1616000	USD
CY2021	msbi	Operating Leases Right Of Use Assets Derecognized Due To Terminations Or Impairment OperatingLeasesRightOfUseAssetsDerecognizedDueToTerminationsOrImpairment	210000	USD
CY2020	msbi	Operating Leases Right Of Use Assets Derecognized Due To Terminations Or Impairment OperatingLeasesRightOfUseAssetsDerecognizedDueToTerminationsOrImpairment	4467000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y6M29D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y1M6D
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0285
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0290
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	1400000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	2300000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	2800000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2180000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2094000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1799000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	894000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	763000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	4251000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	11981000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1267000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10714000	USD
CY2021Q4	msbi	Mortgage Loans Serviced For Others MortgageLoansServicedForOthers	3003192000	USD
CY2021Q4	msbi	Mortgage Loans Serviced For Other Carrying Value MortgageLoansServicedForOtherCarryingValue	28865000	USD
CY2020Q4	msbi	Mortgage Loans Serviced For Others MortgageLoansServicedForOthers	3930783000	USD
CY2020Q4	msbi	Mortgage Loans Serviced For Other Carrying Value MortgageLoansServicedForOtherCarryingValue	40154000	USD
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.0824
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.0818
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1187
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1148
CY2021Q4	us-gaap	Goodwill Goodwill	161900000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	161904000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	161904000	USD
CY2020	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2019	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	72930000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	48556000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	24374000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	71083000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	42701000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	28382000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5900000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6500000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7100000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5208000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4433000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1469579000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3717000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2966000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2450000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	5600000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	24374000	USD
CY2021Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	126643000	USD
CY2020Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	354353000	USD
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	410000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2217000	USD
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	2245701000	USD
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	1663021000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	1568888000	USD
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	869067000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	785871000	USD
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	679115000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	597966000	USD
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	653744000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	678712000	USD
CY2021Q4	us-gaap	Deposits Deposits	6110648000	USD
CY2020Q4	us-gaap	Deposits Deposits	5101016000	USD
CY2021Q4	msbi	Time Deposits250000 Or More TimeDeposits250000OrMore	143500000	USD
CY2020Q4	msbi	Time Deposits250000 Or More TimeDeposits250000OrMore	88300000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	377823000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	134092000	USD
CY2020	msbi	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0030
CY2021Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	82430000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	19778000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	39597000	USD
CY2021Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	24000	USD
CY2021Q4	us-gaap	Time Deposits TimeDeposits	653744000	USD
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	76803000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	68957000	USD
CY2021	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	68986000	USD
CY2020	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	60306000	USD
CY2021	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	77497000	USD
CY2020	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	77136000	USD
CY2021	msbi	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0012
CY2021Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0013
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0012
CY2021Q4	us-gaap	Collateralized Agreements CollateralizedAgreements	78300000	USD
CY2020Q4	us-gaap	Collateralized Agreements CollateralizedAgreements	76500000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2021Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2021Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	45000000.0	USD
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	310171000	USD
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	779171000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	2100000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1860000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	0	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	140000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	70000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	0	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Four To Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate	0	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate	100171000	USD
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	310171000	USD
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	139091000	USD
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	169795000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3852000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	8287000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	144000	USD
CY2015Q2	msbi	Number Of Tranches Of Debt Issued NumberOfTranchesOfDebtIssued	2	tranche
CY2019Q3	msbi	Number Of Tranches Of Debt Issued NumberOfTranchesOfDebtIssued	2	tranche
CY2021Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	49374000	USD
CY2020Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	48814000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10044000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10924000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2318000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7926000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1271000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1761000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-319000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1134000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4321000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17795000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	20814000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6723000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	15218000	USD
CY2021	msbi	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	-2499000	USD
CY2020	msbi	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	-2398000	USD
CY2019	msbi	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	-2568000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5465000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1900000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4805000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	-5614000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	0	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	0	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-93000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	239000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-484000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	0	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	110000	USD
CY2021	msbi	Effective Income Tax Rate Reconciliation Disposition Of Nondeductible Goodwill EffectiveIncomeTaxRateReconciliationDispositionOfNondeductibleGoodwill	0	USD
CY2020	msbi	Effective Income Tax Rate Reconciliation Disposition Of Nondeductible Goodwill EffectiveIncomeTaxRateReconciliationDispositionOfNondeductibleGoodwill	2287000	USD
CY2019	msbi	Effective Income Tax Rate Reconciliation Disposition Of Nondeductible Goodwill EffectiveIncomeTaxRateReconciliationDispositionOfNondeductibleGoodwill	0	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	47000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	10000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	62000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-325000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	716000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-456000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17795000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-6800000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	14042000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	16622000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	2177000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	2152000	USD
CY2021Q4	msbi	Deferred Tax Assets Loans DeferredTaxAssetsLoans	1835000	USD
CY2020Q4	msbi	Deferred Tax Assets Loans DeferredTaxAssetsLoans	2772000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1067000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1047000	USD
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	10113000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	11231000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	879000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1067000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	433000	USD
CY2021Q4	msbi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	2946000	USD
CY2020Q4	msbi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	3289000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3519000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3861000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	36578000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	42474000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	118000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	71000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	36460000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	42403000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	472000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
CY2021Q4	msbi	Deferred Tax Liabilities Unrealized Gains On Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities	569000	USD
CY2020Q4	msbi	Deferred Tax Liabilities Unrealized Gains On Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities	4169000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	5958000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	8315000	USD
CY2021Q4	msbi	Deferred Tax Liabilities Fair Value Adjustment On Trust Preferred Debentures DeferredTaxLiabilitiesFairValueAdjustmentOnTrustPreferredDebentures	4264000	USD
CY2020Q4	msbi	Deferred Tax Liabilities Fair Value Adjustment On Trust Preferred Debentures DeferredTaxLiabilitiesFairValueAdjustmentOnTrustPreferredDebentures	4417000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	3444000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	3632000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	5651000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	6921000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	1446000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	1522000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	22297000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	17910000	USD
CY2021Q4	msbi	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	2318000	USD
CY2020Q4	msbi	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	2524000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3619000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1315000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	50038000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	50725000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	13578000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	8322000	USD
CY2020Q4	msbi	Accumulation Of Prior Years Earnings Representing Tax Bad Debt Deductions AccumulationOfPriorYearsEarningsRepresentingTaxBadDebtDeductions	3100000	USD
CY2021Q4	msbi	Accumulation Of Prior Years Earnings Representing Tax Bad Debt Deductions AccumulationOfPriorYearsEarningsRepresentingTaxBadDebtDeductions	3100000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	100000	USD
CY2021	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	50000.00	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	100000	USD
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CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1200000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1700000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1700000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y
CY2021	us-gaap	Net Income Loss NetIncomeLoss	81317000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2021	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	0	USD
CY2020	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	0	USD
CY2019	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	191000	USD
CY2021	msbi	Preferred Stock Premium Amortization Retained Earnings PreferredStockPremiumAmortizationRetainedEarnings	0	USD
CY2020	msbi	Preferred Stock Premium Amortization Retained Earnings PreferredStockPremiumAmortizationRetainedEarnings	0	USD
CY2019	msbi	Preferred Stock Premium Amortization Retained Earnings PreferredStockPremiumAmortizationRetainedEarnings	145000	USD
CY2021	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	81317000	USD
CY2020	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	22537000	USD
CY2019	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	55738000	USD
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	24912000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	24699000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	23389000	USD
CY2021	us-gaap	Dividends Share Based Compensation DividendsShareBasedCompensation	260000	USD
CY2020	us-gaap	Dividends Share Based Compensation DividendsShareBasedCompensation	259000	USD
CY2019	us-gaap	Dividends Share Based Compensation DividendsShareBasedCompensation	210000	USD
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	564000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	267000	USD
CY2021	msbi	Undistributed Earnings To Common Shareholders UndistributedEarningsToCommonShareholders	55581000	USD
CY2020	msbi	Undistributed Earnings To Common Shareholders UndistributedEarningsToCommonShareholders	-2421000	USD
CY2019	msbi	Undistributed Earnings To Common Shareholders UndistributedEarningsToCommonShareholders	31872000	USD
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	24912000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	24699000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	23389000	USD
CY2021	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	55581000	USD
CY2020	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-2421000	USD
CY2019	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	31872000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	80493000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22278000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	55261000	USD
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	24912000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	24699000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	23389000	USD
CY2021	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	55581000	USD
CY2020	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	-2421000	USD
CY2019	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	31872000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	80493000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22278000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	55261000	USD
CY2021	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	2000	USD
CY2020	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	0	USD
CY2019	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	2000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	80495000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	22278000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	55263000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	22481389	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23336881	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24288793	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	65964	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	9245	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	204638	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	22547353	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	23346126	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24493431	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.58
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
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CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.57
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.26
CY2016Q1	msbi	Minimum Capital Conservation Buffer Percentage MinimumCapitalConservationBufferPercentage	0.025
CY2016Q1	msbi	Minimum Capital Conservation Buffer Percentage MinimumCapitalConservationBufferPercentage	0.025
CY2016Q1	msbi	Minimum Capital Conservation Buffer Percentage MinimumCapitalConservationBufferPercentage	0.025
CY2021Q4	us-gaap	Capital Capital	732177000	USD
CY2021Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1219
CY2021Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	630482000	USD
CY2021Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050
CY2021Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets CommonEquityTier1CapitalToRiskWeightedAssets	550195000	USD
CY2021Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRatio	0.0916
CY2021Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Amount CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalAmount	510390000	USD
CY2021Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalRatio	0.0850
CY2021Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	485244000	USD
CY2021Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0808
CY2021Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	420321000	USD
CY2021Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0700
CY2021Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	550195000	USD
CY2021Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0775
CY2021Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	283941000	USD
CY2021Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2020Q4	us-gaap	Capital Capital	710417000	USD
CY2020Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1324
CY2020Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	563610000	USD
CY2020Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050
CY2020Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	494043000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0920
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	456256000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0850
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets CommonEquityTier1CapitalToRiskWeightedAssets	429092000	USD
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRatio	0.0799
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Amount CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalAmount	375740000	USD
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalRatio	0.0700
CY2020Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	494043000	USD
CY2020Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0750
CY2020Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	263651000	USD
CY2020Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
CY2020Q4	us-gaap	Fair Value Assets Level2 To Level1 Transfers Amount FairValueAssetsLevel2ToLevel1TransfersAmount	0	USD
CY2021Q4	us-gaap	Fair Value Assets Level2 To Level1 Transfers Amount FairValueAssetsLevel2ToLevel1TransfersAmount	0	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0	USD
CY2021Q4	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2020Q4	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
CY2021	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	7532000	USD
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	12337000	USD
CY2019	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	2139000	USD
CY2021	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	-222000	USD
CY2020	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	-1692000	USD
CY2019	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	490000	USD
CY2021	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Impaired Loans FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisImpairedLoans	14468000	USD
CY2020	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Impaired Loans FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisImpairedLoans	24611000	USD
CY2019	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Impaired Loans FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisImpairedLoans	10259000	USD
CY2021	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Other Real Estate Owned FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisOtherRealEstateOwned	454000	USD
CY2020	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Other Real Estate Owned FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisOtherRealEstateOwned	1390000	USD
CY2019	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Other Real Estate Owned FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisOtherRealEstateOwned	16000	USD
CY2021	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	USD
CY2020	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-10404000	USD
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-3577000	USD
CY2021	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasis	22676000	USD
CY2020	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasis	50434000	USD
CY2019	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasis	15501000	USD
CY2021Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	32045000	USD
CY2021Q4	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	584000	USD
CY2021Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	31461000	USD
CY2020Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	138090000	USD
CY2020Q4	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	810000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	137280000	USD
CY2021	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-215000	USD
CY2020	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	179000	USD
CY2019	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-382000	USD
CY2021Q4	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	0	USD
CY2020	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2019	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2021	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2020Q4	msbi	Liability For Unresolved Repurchase Demands LiabilityForUnresolvedRepurchaseDemands	200000	USD
CY2021Q4	msbi	Liability For Unresolved Repurchase Demands LiabilityForUnresolvedRepurchaseDemands	200000	USD
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	207675000	USD
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3393000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	69899000	USD
CY2021	us-gaap	Noninterest Expense NoninterestExpense	175069000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	99112000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17795000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	81317000	USD
CY2021Q4	us-gaap	Assets Assets	7443805000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	199136000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	44361000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	61249000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	184010000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32014000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2020Q4	us-gaap	Assets Assets	6868540000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	189815000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	16985000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	75282000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	175641000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	72471000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2019Q4	us-gaap	Assets Assets	6087017000	USD
CY2021	msbi	Noninterest Income Out Of Scope Of Topic606 NoninterestIncomeOutOfScopeOfTopic606	14879000	USD
CY2020	msbi	Noninterest Income Out Of Scope Of Topic606 NoninterestIncomeOutOfScopeOfTopic606	13036000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	69899000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	61249000	USD
CY2021	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	0	USD
CY2020	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	193000	USD
CY2019	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	1778000	USD

Files In Submission

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$MSBI
Midland States Bancorp Inc Stock $msbi

2021 Q4 Form 10-K Financial Statement

#000146602622000003 Filed on February 25, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSBI Midland States Bancorp Inc Stock $msbi

2021 Q4 Form 10-K Financial Statement

#000146602622000003 Filed on February 25, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSBI
Midland States Bancorp Inc Stock $msbi