$MSBI
Midland States Bancorp Inc Stock $msbi

$msbi Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000146602621000003 Filed on February 26, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2019 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	$3.900M	$2.200M	$4.200M
YoY Change	-7.14%	22.22%	2.44%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$9.196M	$10.33M	$15.76M
YoY Change	-41.64%	-33.57%	20.68%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$10.75M	$3.270M	$16.07M
YoY Change	-33.13%	-80.38%	-22.97%
Income Tax	$2.413M	$3.184M	$3.279M
% Of Pretax Income	22.45%	97.37%	20.4%
Net Earnings	$8.333M	$86.00K	$12.79M
YoY Change	-34.86%	-99.32%	-21.69%
Net Earnings / Revenue
Basic Earnings Per Share	$0.36	$0.00	$0.52
Diluted Earnings Per Share	$0.36	$0.00	$0.51
COMMON SHARES
Basic Shares Outstanding	22.47M shares	22.94M shares	24.27M
Diluted Shares Outstanding		22.94M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.018B	$1.071B	$1.044B
YoY Change	-2.45%	-0.12%	19.83%
Cash & Equivalents	$341.6M	$461.2M	$394.5M
Short-Term Investments	$676.7M	$609.8M	$649.4M
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$74.12M	$74.97M	$91.06M
YoY Change	-18.59%	-20.16%	-3.99%
Goodwill	$161.9M	$161.9M	$171.8M
YoY Change	-5.74%	-5.36%	4.3%
Intangibles	$28.38M	$29.94M	$34.89M
YoY Change	-18.64%	-18.4%	-6.66%
Long-Term Investments	$56.60M	$50.80M	$44.50M
YoY Change	27.19%	11.89%	4.71%
Other Assets			$0.00
YoY Change			-100.0%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$6.869B	$6.700B	$6.087B
YoY Change	12.84%	9.59%	7.97%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable		$4.100M	$6.400M
YoY Change		-39.71%	30.61%
Accrued Expenses	$12.00M	$13.00M	$15.40M
YoY Change	-22.08%	-20.73%
Deferred Revenue
YoY Change
Short-Term Debt	$68.96M	$58.63M	$82.03M
YoY Change	-15.94%	-52.06%	-33.97%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$12.00M	$17.10M	$21.80M
YoY Change	-44.95%	-26.29%	344.9%
LONG-TERM LIABILITIES
Long-Term Debt	$218.6M	$218.4M	$224.9M
YoY Change	-2.8%	-9.34%	58.49%
Other Long-Term Liabilities	$67.40M	$54.90M	$47.50M
YoY Change	41.89%	-10.88%	9.7%
Total Long-Term Liabilities	$286.0M	$273.3M	$272.4M
YoY Change	4.99%	-9.65%	47.08%
TOTAL LIABILITIES
Total Short-Term Liabilities	$12.00M	$17.10M	$21.80M
Total Long-Term Liabilities	$286.0M	$273.3M	$272.4M
Total Liabilities	$6.247B	$6.078B	$5.425B
YoY Change	15.15%	11.35%	7.87%
SHAREHOLDERS EQUITY
Retained Earnings	$156.3M	$154.0M	$165.9M
YoY Change	-5.78%	-3.19%	24.02%
Common Stock	$223.0K	$226.0K	$244.0K
YoY Change	-8.61%	-7.0%	2.52%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$621.4M	$621.9M	$661.9M
YoY Change
Total Liabilities & Shareholders Equity	$6.869B	$6.700B	$6.087B
YoY Change	12.84%	9.59%	7.97%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q4
OPERATING ACTIVITIES
Net Income	$8.333M	$86.00K	$12.79M
YoY Change	-34.86%	-99.32%	-21.69%
Depreciation, Depletion And Amortization	$3.900M	$2.200M	$4.200M
YoY Change	-7.14%	22.22%	2.44%
Cash From Operating Activities	$93.20M	$189.3M	$436.8M
YoY Change	-78.66%	291.12%	1300.0%
INVESTING ACTIVITIES
Capital Expenditures	-$600.0K	-$700.0K	-$1.400M
YoY Change	-57.14%	-22.22%	0.0%
Acquisitions
YoY Change
Other Investing Activities	-$369.1M	-$303.3M	-$418.2M
YoY Change	-11.74%	376.14%	-964.05%
Cash From Investing Activities	-$369.7M	-$304.0M	-$419.6M
YoY Change	-11.89%	370.59%	-992.77%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	156.8M	56.10M	-32.00M
YoY Change	-590.0%	-68.85%	-70.07%
NET CHANGE
Cash From Operating Activities	93.20M	189.3M	436.8M
Cash From Investing Activities	-369.7M	-304.0M	-419.6M
Cash From Financing Activities	156.8M	56.10M	-32.00M
Net Change In Cash	-119.7M	-58.60M	-14.80M
YoY Change	708.78%	-135.75%	-48.43%
FREE CASH FLOW
Cash From Operating Activities	$93.20M	$189.3M	$436.8M
Capital Expenditures	-$600.0K	-$700.0K	-$1.400M
Free Cash Flow	$93.80M	$190.0M	$438.2M
YoY Change	-78.59%	285.4%	1244.17%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001466026
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-35272
CY2020	dei	Entity Registrant Name EntityRegistrantName	MIDLAND STATES BANCORP, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	IL
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	37-1233196
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1201 Network Centre Drive
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	62401
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Effingham
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2020	dei	City Area Code CityAreaCode	217
CY2020	dei	Local Phone Number LocalPhoneNumber	342-7321
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2020	dei	Trading Symbol TradingSymbol	MSBI
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	324060514	USD
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CY2018	msbi	Fees And Commissions From Debit Cards FeesAndCommissionsFromDebitCards	10674000	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
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	464000	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
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-449000	USD
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3581000	USD
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3640000	USD
CY2018	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4288000	USD
CY2020	us-gaap	Noninterest Income Other NoninterestIncomeOther	8794000	USD
CY2019	us-gaap	Noninterest Income Other NoninterestIncomeOther	10019000	USD
CY2018	us-gaap	Noninterest Income Other NoninterestIncomeOther	8703000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	61249000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	75282000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	71791000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	85557000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	91906000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	97410000	USD
CY2020	us-gaap	Occupancy Net OccupancyNet	17552000	USD
CY2019	us-gaap	Occupancy Net OccupancyNet	18811000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	18994000	USD
CY2020	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	22643000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	21390000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	25691000	USD
CY2020	us-gaap	Professional Fees ProfessionalFees	7234000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	8783000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	12789000	USD
CY2020	us-gaap	Marketing Expense MarketingExpense	3498000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	3927000	USD
CY2018	us-gaap	Marketing Expense MarketingExpense	4757000	USD
CY2020	us-gaap	Communication Communication	4052000	USD
CY2019	us-gaap	Communication Communication	3693000	USD
CY2018	us-gaap	Communication Communication	5010000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6504000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7090000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6956000	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
CY2018	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	-458000	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
CY2018	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	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
CY2018	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	0	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	17559000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16954000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19578000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	184010000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	175641000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	191643000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	32014000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	72471000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	50805000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11384000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39421000	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
CY2018	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	141000	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
CY2018	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	39280000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.28
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.26
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
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
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23130475	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
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	23549025	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39421000	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
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-4845000	USD
CY2020	msbi	Other Comprehensive Income Loss Provision For Credit Loss OtherComprehensiveIncomeLossProvisionForCreditLoss	366000	USD
CY2019	msbi	Other Comprehensive Income Loss Provision For Credit Loss OtherComprehensiveIncomeLossProvisionForCreditLoss	0	USD
CY2018	msbi	Other Comprehensive Income Loss Provision For Credit Loss OtherComprehensiveIncomeLossProvisionForCreditLoss	0	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
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	464000	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
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-1443000	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
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3866000	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
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	0	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
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	0	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
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0	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
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3866000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	26526000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65334000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35555000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	449545000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39421000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3866000	USD
CY2018	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	330000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.88
CY2018	msbi	Dividends Common Stock And Share Based Compensation DividendsCommonStockAndShareBasedCompensation	19977000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1533000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	2278000	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	Dividends Preferred Stock Cash DividendsPreferredStockCash	191000	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39421000	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
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	9430000	USD
CY2020	us-gaap	Depreciation Depreciation	6942000	USD
CY2019	us-gaap	Depreciation Depreciation	6583000	USD
CY2018	us-gaap	Depreciation Depreciation	6166000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6504000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7090000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6956000	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
CY2018	msbi	Amortization Of Operating Lease Right Of Use Asset AmortizationOfOperatingLeaseRightOfUseAsset	0	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
CY2018	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	2949000	USD
CY2020	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	2175000	USD
CY2019	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	2364000	USD
CY2018	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	1533000	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
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3579000	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
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3898000	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
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	464000	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
CY2018	msbi	Gains Losses On Sales Of Other Real Estate Excluding Write Downs GainsLossesOnSalesOfOtherRealEstateExcludingWriteDowns	544000	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
CY2018	msbi	Write Down Of Other Real Estate Owned WriteDownOfOtherRealEstateOwned	301000	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
CY2018	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	557305000	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
CY2018	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	590282000	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
CY2018	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	11165000	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
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-449000	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
CY2018	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	-458000	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
CY2018	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2018	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1017080000	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
CY2018	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	431000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	31961000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4701000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5745000	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
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	16090000	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
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	97093000	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
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	76289000	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
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	20178000	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
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	131220000	USD
CY2020	msbi	Equity Securities Fvni Purchases EquitySecuritiesFvniPurchases	3345000	USD
CY2019	msbi	Equity Securities Fvni Purchases EquitySecuritiesFvniPurchases	82000	USD
CY2018	msbi	Equity Securities Fvni Purchases EquitySecuritiesFvniPurchases	59000	USD
CY2020	msbi	Equity Securities Fv Ni Sales EquitySecuritiesFvNiSales	0	USD
CY2019	msbi	Equity Securities Fv Ni Sales EquitySecuritiesFvNiSales	105000	USD
CY2018	msbi	Equity Securities Fv Ni Sales EquitySecuritiesFvNiSales	7733000	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
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	131114000	USD
CY2020	msbi	Proceeds From Sale Of Commercial Fha Origination Platform ProceedsFromSaleOfCommercialFHAOriginationPlatform	7502000	USD
CY2020	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2019	msbi	Proceeds From Sale Of Commercial Fha Origination Platform ProceedsFromSaleOfCommercialFHAOriginationPlatform	0	USD
CY2018	msbi	Proceeds From Sale Of Commercial Fha Origination Platform ProceedsFromSaleOfCommercialFHAOriginationPlatform	0	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
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7200000	USD
CY2020	msbi	Payments To Acquire Nonmarketable Equity Securities PaymentsToAcquireNonmarketableEquitySecurities	12091000	USD
CY2019	msbi	Payments To Acquire Nonmarketable Equity Securities PaymentsToAcquireNonmarketableEquitySecurities	14263000	USD
CY2018	msbi	Payments To Acquire Nonmarketable Equity Securities PaymentsToAcquireNonmarketableEquitySecurities	20737000	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
CY2018	msbi	Proceeds From Sale Of Nonmarketable Equity Securities ProceedsFromSaleOfNonmarketableEquitySecurities	15099000	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
CY2018	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	12994000	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
CY2018	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	3879000	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1449000	USD
CY2020	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2019	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	69879000	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	36153000	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
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6694000	USD
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	556762000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	148344000	USD
CY2018	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-168049000	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
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-31891000	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
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
CY2018	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	891012000	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
CY2019	msbi	Federal Home Loan Bank Advances Prepayment Fees FederalHomeLoanBankAdvancesPrepaymentFees	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
CY2018	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	7443000	USD
CY2019	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	19543000	USD
CY2018	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2020	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	193000	USD
CY2019	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	1778000	USD
CY2018	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	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
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	330000	USD
CY2020	msbi	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	10000	USD
CY2019	msbi	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	2636000	USD
CY2018	msbi	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	0	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	24958000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23599000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19977000	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
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	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
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	2278000	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
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-91901000	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
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1502000	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
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	215202000	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
CY2020	us-gaap	Interest Paid Net InterestPaidNet	47712000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	58158000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	40956000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2977000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	479000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	580000	USD
CY2020	msbi	Transfer Of Investment Securities Available For Sale To Equity Securities TransferOfInvestmentSecuritiesAvailableForSaleToEquitySecurities	0	USD
CY2019	msbi	Transfer Of Investment Securities Available For Sale To Equity Securities TransferOfInvestmentSecuritiesAvailableForSaleToEquitySecurities	0	USD
CY2018	msbi	Transfer Of Investment Securities Available For Sale To Equity Securities TransferOfInvestmentSecuritiesAvailableForSaleToEquitySecurities	2830000	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
CY2018	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	USD
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	16736000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	3819000	USD
CY2018	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1104000	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
CY2018	msbi	Transfer Of Premises And Equipment To Assets Held For Sale TransferOfPremisesAndEquipmentToAssetsHeldForSale	0	USD
CY2020Q1	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	40811000	USD
CY2020Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1507000	USD
CY2020Q4	msbi	Interest Receivable From Loans InterestReceivableFromLoans	19900000	USD
CY2020	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 ACL 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. ACL 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:12pt"><table style="border-collapse:collapse;display:inline-table;vertical-align:top;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:9pt;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/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 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/borrower attributes and certain macroeconomic variables. Significant loan/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/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, among others, (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/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. This same forecast/reversion period is used for all macroeconomic variables used in all of 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 </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%">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 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 an effective balance greater than $500,000, accruing loans 90 days past due or greater with an effective balance greater than $100,000, specialty lending relationships and other loans as determined by management. ACL 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. ACL 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>
CY2020Q4	msbi	Loans And Lease Receivables Probability Of Default Non Accrual Loans Threshold Balance Minimum LoansAndLeaseReceivablesProbabilityOfDefaultNonAccrualLoansThresholdBalanceMinimum	500000	USD
CY2020Q4	msbi	Loans And Lease Receivables Probability Of Default Accrual Loans90 Days Due Threshold Balance Minimum LoansAndLeaseReceivablesProbabilityOfDefaultAccrualLoans90DaysDueThresholdBalanceMinimum	100000	USD
CY2020	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 $2.4 million and $1.2 million at December 31, 2020 and 2019, respectively.</span></div>
CY2020Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	2400000	USD
CY2019Q4	us-gaap	Unused Commitments To Extend Credit UnusedCommitmentsToExtendCredit	1200000	USD
CY2020Q4	msbi	Required Cash Reserve RequiredCashReserve	0	USD
CY2019Q4	msbi	Required Cash Reserve RequiredCashReserve	36900000	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
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	639168000	USD
CY2019	us-gaap	Available For Sale Debt Securities Gross Unrealized Gain AvailableForSaleDebtSecuritiesGrossUnrealizedGain	11139000	USD
CY2019	us-gaap	Available For Sale Debt Securities Gross Unrealized Loss AvailableForSaleDebtSecuritiesGrossUnrealizedLoss	874000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	649433000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	30924000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	31329000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	60927000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	63470000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	176530000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	180383000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	34581000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	36208000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	358751000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	365321000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	661713000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	676711000	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
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	20178000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1721000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	737000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	11085000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	786000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	542000	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
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	25000	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
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	115677000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	137000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	126762000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	874000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	22	security
CY2020Q4	msbi	Available For Sale Securities In Unrealized Loss Positions Aggregate Depreciation Percentage AvailableForSaleSecuritiesInUnrealizedLossPositionsAggregateDepreciationPercentage	0.0117
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	9400000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5600000	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
CY2018	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	7733000	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
CY2018	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	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
CY2018	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	53000	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
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-10000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	5103331000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4401410000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	700000	USD
CY2019Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	2200000	USD
CY2020Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	46500000	USD
CY2019Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	39600000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	138100000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	16400000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	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 Losses FinancingReceivableAllowanceForCreditLosses	60443000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	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 Losses FinancingReceivableAllowanceForCreditLosses	28028000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16431000	USD
CY2018	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	9430000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6989000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2031000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	20903000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	9977000	USD
CY2019Q4	msbi	Financing Receivable Allowance For Credit Losses For Nonimpaired Loans Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesForNonimpairedLoansCollectivelyEvaluatedForImpairment	16080000	USD
CY2019Q4	msbi	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	23267000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	788000	USD
CY2019Q4	msbi	Financing Receivable Allowance For Credit Losses For Loans Acquired With Deteriorated Credit Quality FinancingReceivableAllowanceForCreditLossesForLoansAcquiredWithDeterioratedCreditQuality	1183000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	28028000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	35736000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	6346000	USD
CY2019Q4	msbi	Financing Receivable Nonimpaired Loans Collectively Evaluated For Impairment FinancingReceivableNonimpairedLoansCollectivelyEvaluatedForImpairment	4316617000	USD
CY2019Q4	msbi	Financing Receivable Nonimpaired Loans Loans Acquired With Deteriorated Credit Quality FinancingReceivableNonimpairedLoansLoansAcquiredWithDeterioratedCreditQuality	42711000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4401410000	USD
CY2020Q4	msbi	Loans And Lease Receivables Probability Of Default Non Accrual Loans Threshold Balance Minimum LoansAndLeaseReceivablesProbabilityOfDefaultNonAccrualLoansThresholdBalanceMinimum	500000	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
CY2019Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	15134000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	38401000	USD
CY2020Q1	us-gaap	Financing Receivable Purchased With Credit Deterioration Amount At Par Value FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue	9800000	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
CY2018	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 Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	3300000	USD
CY2019	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	2200000	USD
CY2018	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	1800000	USD
CY2019	msbi	Loans And Leases Receivable Impaired Troubled Debt Interest Income Recognized LoansAndLeasesReceivableImpairedTroubledDebtInterestIncomeRecognized	100000	USD
CY2018	msbi	Loans And Leases Receivable Impaired Troubled Debt Interest Income Recognized LoansAndLeasesReceivableImpairedTroubledDebtInterestIncomeRecognized	100000	USD
CY2020	msbi	Loans And Leases Receivable Impaired Troubled Debt Interest Income Recognized LoansAndLeasesReceivableImpairedTroubledDebtInterestIncomeRecognized	100000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	33001000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	49628000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	5020702000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	5103331000	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
CY2019Q4	msbi	Financing Receivable Modifications Recorded Investment Accruing FinancingReceivableModificationsRecordedInvestmentAccruing	3318000	USD
CY2019Q4	msbi	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	12418000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	15736000	USD
CY2020	us-gaap	Financing Receivable Change In Method Credit Loss Expense Reversal FinancingReceivableChangeInMethodCreditLossExpenseReversal	800000	USD
CY2019	us-gaap	Financing Receivable Change In Method Credit Loss Expense Reversal FinancingReceivableChangeInMethodCreditLossExpenseReversal	2000000.0	USD
CY2019Q4	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
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
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	36	loan
CY2018	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	2832000	USD
CY2018	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	2799000	USD
CY2020	msbi	Number Of Main Regions NumberOfMainRegions	4	region
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	115292000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	128265000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	41168000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	37210000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	74124000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	91055000	USD
CY2020	us-gaap	Depreciation Depreciation	6900000	USD
CY2019	us-gaap	Depreciation Depreciation	6600000	USD
CY2018	us-gaap	Depreciation Depreciation	6200000	USD
CY2020Q3	msbi	Restructuring And Related Cost Number Of Stores Eliminated RestructuringAndRelatedCostNumberOfStoresEliminated	13	branch
CY2020Q3	msbi	Restructuring And Related Cost Area Of Office Space To Be Vacated RestructuringAndRelatedCostAreaOfOfficeSpaceToBeVacated	23000	sqft
CY2020Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	10400000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Transfers And Changes PropertyPlantAndEquipmentTransfersAndChanges	-2300000	USD
CY2019Q3	msbi	Number Of Banking Facilities To Be Closed To Homestar NumberOfBankingFacilitiesToBeClosedToHomestar	1	facility
CY2019Q3	msbi	Number Of Banking Facilities To Be Consolidated To Home Star Banking Facilities NumberOfBankingFacilitiesToBeConsolidatedToHomeStarBankingFacilities	2	facility
CY2019Q3	msbi	Number Of Banking Facilities To Be Consolidated To Footprint NumberOfBankingFacilitiesToBeConsolidatedToFootprint	3	facility
CY2020Q1	msbi	Number Of Banking Facilities To Be Closed To Homestar NumberOfBankingFacilitiesToBeClosedToHomestar	2	facility
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3200000	USD
CY2020Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	4200000	USD
CY2019Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	4000000.0	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	9200000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	14200000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	12000000.0	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	15400000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	2400000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P10Y
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	2943000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	2752000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3280000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3241000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1616000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	18482000	USD
CY2020	msbi	Operating Leases Right Of Use Assets Derecognized Due To Terminations Or Impairment OperatingLeasesRightOfUseAssetsDerecognizedDueToTerminationsOrImpairment	4467000	USD
CY2019	msbi	Operating Leases Right Of Use Assets Derecognized Due To Terminations Or Impairment OperatingLeasesRightOfUseAssetsDerecognizedDueToTerminationsOrImpairment	0	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y1M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0290
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0298
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	2300000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	2800000	USD
CY2018	us-gaap	Operating Lease Expense OperatingLeaseExpense	3200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2184000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1899000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1546000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	762000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	4924000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	13515000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1557000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	11958000	USD
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.0818
CY2019	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.0820
CY2019	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1102
CY2020Q4	us-gaap	Goodwill Goodwill	161900000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	171800000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q4	us-gaap	Goodwill Goodwill	161904000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	171758000	USD
CY2019	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2020	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	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
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	71083000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	36197000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34886000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6500000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7100000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5675000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4900000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4125000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3409000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2659000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	7614000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	28382000	USD
CY2020Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	354353000	USD
CY2019Q4	us-gaap	Derivative Asset Notional Amount DerivativeAssetNotionalAmount	443706000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2217000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	3350000	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1400000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	1100000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2000000.0	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1469579000	USD
CY2019Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1019472000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	1568888000	USD
CY2019Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	1342788000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	785871000	USD
CY2019Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	787662000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	597966000	USD
CY2019Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	522456000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	678712000	USD
CY2019Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	871876000	USD
CY2020Q4	us-gaap	Deposits Deposits	5101016000	USD
CY2019Q4	us-gaap	Deposits Deposits	4544254000	USD
CY2020Q4	msbi	Time Deposits250000 Or More TimeDeposits250000OrMore	88300000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	22800000	USD
CY2019Q4	msbi	Time Deposits250000 Or More TimeDeposits250000OrMore	122700000	USD
CY2019Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	49700000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	540932000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	84818000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	31779000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	9420000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	11711000	USD
CY2020Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	52000	USD
CY2020Q4	us-gaap	Time Deposits TimeDeposits	678712000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	68957000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	82029000	USD
CY2020	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	60306000	USD
CY2019	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	121168000	USD
CY2020	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	77136000	USD
CY2019	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	138907000	USD
CY2020	msbi	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0030
CY2019	msbi	Short Term Debt Weighted Average Interest Rate During Period ShortTermDebtWeightedAverageInterestRateDuringPeriod	0.0069
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0012
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0067
CY2020Q4	us-gaap	Collateralized Agreements CollateralizedAgreements	76500000	USD
CY2019Q4	us-gaap	Collateralized Agreements CollateralizedAgreements	87400000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	20000000.0	USD
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	779171000	USD
CY2019Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	493311000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1860000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1940000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	304000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	0	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	225000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	70000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Four To Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate	80000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate	100171000	USD
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	779171000	USD
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	169795000	USD
CY2019Q4	us-gaap	Subordinated Debt SubordinatedDebt	176653000	USD
CY2015Q2	msbi	Number Of Tranches Of Debt Issued NumberOfTranchesOfDebtIssued	2	tranche
CY2019Q3	msbi	Number Of Tranches Of Debt Issued NumberOfTranchesOfDebtIssued	2	tranche
CY2020Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	48814000	USD
CY2019Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	48288000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10924000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2318000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	55000	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
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6748000	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
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	807000	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
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3774000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11384000	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
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	10665000	USD
CY2020	msbi	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	-2398000	USD
CY2019	msbi	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	-2568000	USD
CY2018	msbi	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	-2622000	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
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4028000	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
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-62000	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
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	71000	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
CY2018	msbi	Effective Income Tax Rate Reconciliation Disposition Of Nondeductible Goodwill EffectiveIncomeTaxRateReconciliationDispositionOfNondeductibleGoodwill	0	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
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-409000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	716000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-456000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-287000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9477000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16687000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11384000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	16622000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	7708000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	2152000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	2332000	USD
CY2020Q4	msbi	Deferred Tax Assets Loans DeferredTaxAssetsLoans	2772000	USD
CY2019Q4	msbi	Deferred Tax Assets Loans DeferredTaxAssetsLoans	5386000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1047000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1049000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	11231000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	15510000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1067000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	1217000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	433000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2020Q4	msbi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	3289000	USD
CY2019Q4	msbi	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	4227000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3861000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2961000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	42474000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	40390000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	71000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	62000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	42403000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	40328000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1735000	USD
CY2020Q4	msbi	Deferred Tax Liabilities Unrealized Gains On Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities	4169000	USD
CY2019Q4	msbi	Deferred Tax Liabilities Unrealized Gains On Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentSecurities	2846000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	8315000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	11436000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	8322000	USD
CY2020Q4	msbi	Deferred Tax Liabilities Fair Value Adjustment On Trust Preferred Debentures DeferredTaxLiabilitiesFairValueAdjustmentOnTrustPreferredDebentures	4417000	USD
CY2019Q4	msbi	Deferred Tax Liabilities Fair Value Adjustment On Trust Preferred Debentures DeferredTaxLiabilitiesFairValueAdjustmentOnTrustPreferredDebentures	4560000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	3632000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	3539000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	6921000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	8380000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	1522000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	1638000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	17910000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	12313000	USD
CY2020Q4	msbi	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	2524000	USD
CY2019Q4	msbi	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	3912000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1315000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1247000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	50725000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	51606000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	11278000	USD
CY2019Q4	msbi	Accumulation Of Prior Years Earnings Representing Tax Bad Debt Deductions AccumulationOfPriorYearsEarningsRepresentingTaxBadDebtDeductions	3100000	USD
CY2020Q4	msbi	Accumulation Of Prior Years Earnings Representing Tax Bad Debt Deductions AccumulationOfPriorYearsEarningsRepresentingTaxBadDebtDeductions	3100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	100000	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	10000.00	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	100000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1700000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1700000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1800000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y8M12D
CY2020	us-gaap	Net Income Loss NetIncomeLoss	22537000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	55784000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39421000	USD
CY2020	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	0	USD
CY2019	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	191000	USD
CY2018	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	330000	USD
CY2020	msbi	Preferred Stock Premium Amortization PreferredStockPremiumAmortization	0	USD
CY2019	msbi	Preferred Stock Premium Amortization PreferredStockPremiumAmortization	145000	USD
CY2018	msbi	Preferred Stock Premium Amortization PreferredStockPremiumAmortization	189000	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
CY2018	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	39280000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	24699000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	23389000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	19838000	USD
CY2020	us-gaap	Dividends Share Based Compensation DividendsShareBasedCompensation	259000	USD
CY2019	us-gaap	Dividends Share Based Compensation DividendsShareBasedCompensation	210000	USD
CY2018	us-gaap	Dividends Share Based Compensation DividendsShareBasedCompensation	139000	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
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	123000	USD
CY2020	msbi	Undistributed Earnings To Common Shareholders UndistributedEarningsToCommonShareholders	-2421000	USD
CY2019	msbi	Undistributed Earnings To Common Shareholders UndistributedEarningsToCommonShareholders	31872000	USD
CY2018	msbi	Undistributed Earnings To Common Shareholders UndistributedEarningsToCommonShareholders	19180000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	24699000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	23389000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	19838000	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
CY2018	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	19180000	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
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39018000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	24699000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	23389000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	19838000	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
CY2018	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	19180000	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
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39018000	USD
CY2020	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	0	USD
CY2019	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	2000	USD
CY2018	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	2000	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
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	39020000	USD
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
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23130475	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
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	418550	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
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	23549025	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.28
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.95
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.26
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2019Q1	msbi	Minimum Capital Conservation Buffer Percentage MinimumCapitalConservationBufferPercentage	0.025
CY2019Q1	msbi	Minimum Capital Conservation Buffer Percentage MinimumCapitalConservationBufferPercentage	0.025
CY2019Q1	msbi	Minimum Capital Conservation Buffer Percentage MinimumCapitalConservationBufferPercentage	0.025
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
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
CY2020Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets CommonEquityTier1CapitalToRiskWeightedAssets	494043000	USD
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRatio	0.0920
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Amount CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalAmount	456256000	USD
CY2020Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalRatio	0.0850
CY2020Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	429092000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.0799
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	375740000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	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
CY2019Q4	us-gaap	Capital Capital	772572000	USD
CY2019Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1472
CY2019Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	515548000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
CY2019Q4	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2019Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.1050
CY2019Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	516647000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1052
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	417348000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0850
CY2019Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets CommonEquityTier1CapitalToRiskWeightedAssets	451696000	USD
CY2019Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRatio	0.0920
CY2019Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Amount CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalAmount	343699000	USD
CY2019Q4	msbi	Common Equity Tier1 Capital To Risk Weighted Assets Required For Adequate Capital Ratio CommonEquityTier1CapitalToRiskWeightedAssetsRequiredForAdequateCapitalRatio	0.0700
CY2019Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	516647000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.0874
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	236504000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2020Q4	us-gaap	Fair Value Assets Level1 To Level2 Transfers Amount FairValueAssetsLevel1ToLevel2TransfersAmount	0	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0	USD
CY2020Q4	us-gaap	Fair Value Assets Level2 To Level1 Transfers Amount FairValueAssetsLevel2ToLevel1TransfersAmount	0	USD
CY2020Q4	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	810000	USD
CY2019Q4	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
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	12337000	USD
CY2019	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	2139000	USD
CY2018	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-449000	USD
CY2020	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	-1692000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	137280000	USD
CY2019	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	490000	USD
CY2018	msbi	Gain Loss On Sale Of Mortgage Service Rights Held For Sale GainLossOnSaleOfMortgageServiceRightsHeldForSale	-458000	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
CY2018	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Impaired Loans FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisImpairedLoans	5800000	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
CY2018	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis Other Real Estate Owned FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasisOtherRealEstateOwned	301000	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
CY2018	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	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
CY2018	msbi	Fair Value Gains Losses Recognized On Assets Measured On Non Recurring Basis FairValueGainsLossesRecognizedOnAssetsMeasuredOnNonRecurringBasis	6110000	USD
CY2020Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	138090000	USD
CY2019Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	16431000	USD
CY2019Q4	us-gaap	Fair Value Option Loans Held As Assets Aggregate Difference FairValueOptionLoansHeldAsAssetsAggregateDifference	652000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	15779000	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
CY2018	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	258000	USD
CY2020Q4	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	0	USD
CY2018	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	10000.00	USD
CY2020	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2019	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2020Q4	msbi	Liability For Unresolved Repurchase Demands LiabilityForUnresolvedRepurchaseDemands	300000	USD
CY2019Q4	msbi	Liability For Unresolved Repurchase Demands LiabilityForUnresolvedRepurchaseDemands	300000	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 Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	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 Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	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
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	180087000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	9430000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	71791000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	191643000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	50805000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11384000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39421000	USD
CY2018Q4	us-gaap	Assets Assets	5637673000	USD
CY2020Q1	us-gaap	Interest Income Operating InterestIncomeOperating	61314000	USD
CY2020Q2	us-gaap	Interest Income Operating InterestIncomeOperating	60548000	USD
CY2020	msbi	Noninterest Income Out Of Scope Of Topic606 NoninterestIncomeOutOfScopeOfTopic606	13036000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	61249000	USD
CY2020	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	193000	USD
CY2019	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	1778000	USD
CY2018	msbi	Subordinated Debt Prepayment Fees SubordinatedDebtPrepaymentFees	0	USD
CY2020Q3	us-gaap	Interest Income Operating InterestIncomeOperating	60314000	USD
CY2020Q4	us-gaap	Interest Income Operating InterestIncomeOperating	62712000	USD
CY2020Q1	us-gaap	Interest Expense InterestExpense	14663000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	11559000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	10334000	USD
CY2020Q4	us-gaap	Interest Expense InterestExpense	9196000	USD
CY2020Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	46651000	USD
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	48989000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	49980000	USD
CY2020Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	53516000	USD
CY2020Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11578000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10997000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	11728000	USD
CY2020Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10058000	USD
CY2020Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	35073000	USD
CY2020Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	37992000	USD
CY2020Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	38252000	USD
CY2020Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	43458000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	8598000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	19396000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	18919000	USD
CY2020Q4	us-gaap	Noninterest Income NoninterestIncome	14336000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	41666000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	41395000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	53901000	USD
CY2020Q4	us-gaap	Noninterest Expense NoninterestExpense	47048000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2005000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15993000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3270000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	10746000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	456000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3424000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3184000	USD
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2413000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1549000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	12569000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	86000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	8333000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.00
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.36
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.00
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2019Q1	us-gaap	Interest Income Operating InterestIncomeOperating	59432000	USD
CY2019Q2	us-gaap	Interest Income Operating InterestIncomeOperating	60636000	USD
CY2019Q3	us-gaap	Interest Income Operating InterestIncomeOperating	65006000	USD
CY2019Q4	us-gaap	Interest Income Operating InterestIncomeOperating	64444000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	13831000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	14559000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	15556000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	15757000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	45601000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	46077000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	49450000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	48687000	USD
CY2019Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3243000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4076000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4361000	USD
CY2019Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5305000	USD
CY2019Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	42358000	USD
CY2019Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	42001000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	45089000	USD
CY2019Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	43382000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	17075000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	19587000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	19606000	USD
CY2019Q4	us-gaap	Noninterest Income NoninterestIncome	19014000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	41097000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	40194000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	48025000	USD
CY2019Q4	us-gaap	Noninterest Expense NoninterestExpense	46325000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18336000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21394000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16670000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16071000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4354000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5039000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4015000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3279000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	13982000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	16355000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	12655000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	12792000	USD
CY2019Q1	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	34000	USD
CY2019Q2	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	34000	USD
CY2019Q3	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	-22000	USD
CY2019Q4	msbi	Preferred Stock Dividend And Amortization Of Premium PreferredStockDividendAndAmortizationOfPremium	0	USD
CY2019Q1	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	13948000	USD
CY2019Q2	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	16321000	USD
CY2019Q3	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	12677000	USD
CY2019Q4	msbi	Earnings Loss Before Distributed And Undistributed Earnings Loss Allocated To Participating Securities Basic EarningsLossBeforeDistributedAndUndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	12792000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.58
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.67
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51

Files In Submission

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$MSBI
Midland States Bancorp Inc Stock $msbi

2020 Q4 Form 10-K Financial Statement

#000146602621000003 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$MSBI Midland States Bancorp Inc Stock $msbi

2020 Q4 Form 10-K Financial Statement

#000146602621000003 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MSBI
Midland States Bancorp Inc Stock $msbi