$ONB
Old National Bancorp Stock $onb

$onb Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-Q Financial Statement

#000070717921000032 Filed on April 28, 2021

Income Statement

Concept	2021 Q1	2020 Q1
Revenue	$159.2M	$168.0M
YoY Change	-5.22%	-6.1%
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	$7.100M	$8.600M
YoY Change	-17.44%	34.38%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$11.12M	$24.23M
YoY Change	-54.12%	-23.98%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$104.4M	$25.58M
YoY Change	308.33%	-63.13%
Income Tax	$17.63M	$2.939M
% Of Pretax Income	16.88%	11.49%
Net Earnings	$86.82M	$22.64M
YoY Change	283.47%	-59.77%
Net Earnings / Revenue	54.52%	13.48%
Basic Earnings Per Share	$0.53	$0.13
Diluted Earnings Per Share	$0.52	$0.13
COMMON SHARES
Basic Shares Outstanding	165.0M shares	167.7M shares
Diluted Shares Outstanding	165.7M shares	168.4M shares

Balance Sheet

Concept	2021 Q1	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$457.8M	$343.2M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$541.0M	$462.4M
YoY Change	17.01%	-5.68%
Goodwill	$1.037B	$1.037B
YoY Change	0.0%	0.07%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$7.000M	$18.00M
YoY Change	-61.11%	-71.88%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$23.74B	$20.74B
YoY Change	14.48%	3.27%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$340.0M	$332.0M
YoY Change	2.41%	31.23%
Deferred Revenue
YoY Change
Short-Term Debt	$396.0M	$879.0M
YoY Change	-54.95%	31.59%
Long-Term Debt Due	$1.000M
YoY Change
Total Short-Term Liabilities	$341.0M	$332.0M
YoY Change	2.71%	31.23%
LONG-TERM LIABILITIES
Long-Term Debt	$266.0M	$236.0M
YoY Change	12.71%	-6.35%
Other Long-Term Liabilities	-$12.00M	$65.00M
YoY Change	-118.46%	132.14%
Total Long-Term Liabilities	$254.0M	$301.0M
YoY Change	-15.61%	7.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$341.0M	$332.0M
Total Long-Term Liabilities	$254.0M	$301.0M
Total Liabilities	$20.77B	$17.92B
YoY Change	15.89%	3.38%
SHAREHOLDERS EQUITY
Retained Earnings	$847.3M	$682.2M
YoY Change	24.2%	20.25%
Common Stock	$2.040B	$2.035B
YoY Change	0.24%	-6.72%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.979B	$2.823B
YoY Change
Total Liabilities & Shareholders Equity	$23.74B	$20.74B
YoY Change	14.48%	3.27%

Cashflow Statement

Concept	2021 Q1	2020 Q1
OPERATING ACTIVITIES
Net Income	$86.82M	$22.64M
YoY Change	283.47%	-59.77%
Depreciation, Depletion And Amortization	$7.100M	$8.600M
YoY Change	-17.44%	34.38%
Cash From Operating Activities	$83.20M	-$21.13M
YoY Change	-493.7%	-164.02%
INVESTING ACTIVITIES
Capital Expenditures	$12.88M	$7.938M
YoY Change	62.24%	-32.06%
Acquisitions	$0.00
YoY Change
Other Investing Activities	-$888.8M	-$44.10M
YoY Change	1915.42%	-75.99%
Cash From Investing Activities	-$901.6M	-$52.08M
YoY Change	1631.12%	-73.34%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$2.717M	$81.67M
YoY Change	-96.67%	200.63%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$686.5M	$140.1M
YoY Change	390.16%	-16.77%
NET CHANGE
Cash From Operating Activities	$83.20M	-$21.13M
Cash From Investing Activities	-$901.6M	-$52.08M
Cash From Financing Activities	$686.5M	$140.1M
Net Change In Cash	-$131.9M	$66.84M
YoY Change	-297.39%	1023.17%
FREE CASH FLOW
Cash From Operating Activities	$83.20M	-$21.13M
Capital Expenditures	$12.88M	$7.938M
Free Cash Flow	$70.32M	-$29.07M
YoY Change	-341.89%	-236.31%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q1	dei	Amendment Flag AmendmentFlag	false
CY2021Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2021Q1	dei	Entity Registrant Name EntityRegistrantName	Old National Bancorp /IN/
CY2021Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000707179
CY2021Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021Q1	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
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CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:OtherBorrowings
CY2021Q1	dei	Document Type DocumentType	10-Q
CY2021Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2021Q1	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
CY2021Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2021Q1	dei	Entity File Number EntityFileNumber	1-15817
CY2021Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	IN
CY2021Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	35-1539838
CY2021Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Main Street
CY2021Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	47708
CY2021Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	Evansville,
CY2021Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	IN
CY2021Q1	dei	City Area Code CityAreaCode	(800)
CY2021Q1	dei	Local Phone Number LocalPhoneNumber	731-2265
CY2021Q1	dei	Security12b Title Security12bTitle	Common Stock, No Par Value
CY2021Q1	dei	Trading Symbol TradingSymbol	ONB
CY2021Q1	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2021Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3776000	USD
CY2021Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1202000	USD
CY2020Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-5515000	USD
CY2021Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	4881000	USD
CY2020Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	28578000	USD
CY2021Q1	us-gaap	Noninterest Expense NoninterestExpense	117740000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	158744000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	104448000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25579000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17630000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2939000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	86818000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	22640000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.13
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.13
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164997000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	167748000	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165707000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	168404000	shares
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	86818000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	22640000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-73514000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	103954000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1993000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	5174000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-16667000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	22411000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-58840000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	76369000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	4048000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	7803000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	149000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	431000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	958000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	1811000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2941000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	5561000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-49000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-27000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-12000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-7000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-37000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-20000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-55862000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	81950000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	30956000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	104590000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2852453000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	22640000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	81950000	USD
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2020Q1	us-gaap	Dividends Common Stock DividendsCommonStock	23535000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	151000	USD
CY2020Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	81822000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2748000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	2823435000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2972656000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	86818000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-55862000	USD
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2021Q1	us-gaap	Dividends Common Stock DividendsCommonStock	23195000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	139000	USD
CY2021Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	2856000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1747000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	2979447000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	86818000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	22640000	USD
CY2021Q1	us-gaap	Depreciation Depreciation	7079000	USD
CY2020Q1	us-gaap	Depreciation Depreciation	8594000	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3075000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3776000	USD
CY2021Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1202000	USD
CY2020Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-5515000	USD
CY2021Q1	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-3606000	USD
CY2020Q1	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-5146000	USD
CY2021Q1	onb	Net Accretion Of Premiums And Discounts From Acquired Loans NetAccretionOfPremiumsAndDiscountsFromAcquiredLoans	4695000	USD
CY2020Q1	onb	Net Accretion Of Premiums And Discounts From Acquired Loans NetAccretionOfPremiumsAndDiscountsFromAcquiredLoans	6649000	USD
CY2021Q1	us-gaap	Share Based Compensation ShareBasedCompensation	1747000	USD
CY2020Q1	us-gaap	Share Based Compensation ShareBasedCompensation	2748000	USD
CY2021Q1	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	915000	USD
CY2020Q1	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	818000	USD
CY2021Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-17356000	USD
CY2020Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	16950000	USD
CY2021Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1993000	USD
CY2020Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	5174000	USD
CY2021Q1	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	10330000	USD
CY2020Q1	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	-11826000	USD
CY2021Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2714000	USD
CY2020Q1	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3080000	USD
CY2021Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	326118000	USD
CY2020Q1	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	223961000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	349730000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	219626000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-4465000	USD
CY2020Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-7313000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-33562000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	87826000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-43966000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2242000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	83197000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-21132000	USD
CY2021Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1245673000	USD
CY2020Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	446819000	USD
CY2021Q1	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	0	USD
CY2020Q1	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	10025000	USD
CY2021Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	428614000	USD
CY2020Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	436742000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	52468000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	236410000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	16000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	11000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	227000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	133000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	134082000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	262497000	USD
CY2021Q1	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2042000	USD
CY2020Q1	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1899000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	7632000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2021Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	12879000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7938000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-901635000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-52084000	USD
CY2021Q1	us-gaap	Net Change Interest Bearing Deposits Domestic NetChangeInterestBearingDepositsDomestic	812302000	USD
CY2020Q1	us-gaap	Net Change Interest Bearing Deposits Domestic NetChangeInterestBearingDepositsDomestic	-248035000	USD
CY2021Q1	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	244000	USD
CY2020Q1	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	-210356000	USD
CY2021Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-35924000	USD
CY2020Q1	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-9715000	USD
CY2021Q1	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	13441000	USD
CY2020Q1	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-7339000	USD
CY2021Q1	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	125004000	USD
CY2020Q1	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	200005000	USD
CY2021Q1	onb	Payments Of Fhl Bank Borrowings Modifications Financing Activities PaymentsOfFHLBankBorrowingsModificationsFinancingActivities	2156000	USD
CY2020Q1	onb	Payments Of Fhl Bank Borrowings Modifications Financing Activities PaymentsOfFHLBankBorrowingsModificationsFinancingActivities	0	USD
CY2021Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	50000000	USD
CY2020Q1	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	500000000	USD
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23195000	USD
CY2020Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23535000	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2856000	USD
CY2020Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	81822000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	139000	USD
CY2020Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	151000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	686503000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	140056000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-131935000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	66840000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	589712000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	276337000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	457777000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	343177000	USD
CY2021Q1	us-gaap	Interest Paid Net InterestPaidNet	13302000	USD
CY2020Q1	us-gaap	Interest Paid Net InterestPaidNet	26387000	USD
CY2021Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1400000	USD
CY2020Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1212000	USD
CY2021Q1	onb	Investment Securities Purchased But Not Settled InvestmentSecuritiesPurchasedButNotSettled	112489000	USD
CY2020Q1	onb	Investment Securities Purchased But Not Settled InvestmentSecuritiesPurchasedButNotSettled	102459000	USD
CY2021Q1	onb	Net Reduction In Operating Lease Right Of Use Asset Modifications NetReductionInOperatingLeaseRightOfUseAssetModifications	-988000	USD
CY2020Q1	onb	Net Reduction In Operating Lease Right Of Use Asset Modifications NetReductionInOperatingLeaseRightOfUseAssetModifications	310000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	86818000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	22640000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164997000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	167748000	shares
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.13
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	86818000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	22640000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164997000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	167748000	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	687000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	616000	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	23000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	40000	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165707000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	168404000	shares
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.13
CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	6660220000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	193244000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	82422000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-46512000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6724530000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	5784754000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	197714000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	11385000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	-968000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	5970115000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	52468000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	236410000	USD
CY2021Q1	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables Categorized As Available For Sale ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale	10245000	USD
CY2020Q1	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables Categorized As Available For Sale ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale	163771000	USD
CY2021Q1	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	62713000	USD
CY2020Q1	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	400181000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	2000000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	5595000	USD
CY2021Q1	onb	Realized Gains On Calls Of Available For Sale Securities RealizedGainsOnCallsOfAvailableForSaleSecurities	13000	USD
CY2020Q1	onb	Realized Gains On Calls Of Available For Sale Securities RealizedGainsOnCallsOfAvailableForSaleSecurities	13000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	409000	USD
CY2021Q1	onb	Realized Loss On Calls Of Available For Sale Securities RealizedLossOnCallsOfAvailableForSaleSecurities	20000	USD
CY2020Q1	onb	Realized Loss On Calls Of Available For Sale Securities RealizedLossOnCallsOfAvailableForSaleSecurities	25000	USD
CY2021Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1993000	USD
CY2020Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	5174000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	126291000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	127635000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity Within One Year Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityWithinOneYearWeightedAverageYield	0.0286
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2208550000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2271071000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity After One Through Five Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityAfterOneThroughFiveYearsWeightedAverageYield	0.0243
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	2015116000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2005310000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity After Five Through Ten Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityAfterFiveThroughTenYearsWeightedAverageYield	0.0177
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	2310263000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	2320514000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity After10 Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityAfter10YearsWeightedAverageYield	0.0245
CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	6660220000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6724530000	USD
CY2021Q1	onb	Available For Sale Securities Debt Maturities Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageYield	0.0225
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	2651373000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	76370000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	46786000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	6052000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	2698159000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	82422000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	654262000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4917000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	36356000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	6468000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	690618000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	11385000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	26100000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	27000000.0	USD
CY2021Q1	onb	Number Of Securities In Security Portfolio NumberOfSecuritiesInSecurityPortfolio	1892	security
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	280	security
CY2021Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2400000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2500000	USD
CY2020Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	100000	USD
CY2021Q1	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	100000	USD
CY2020Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	USD
CY2021Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	USD
CY2021Q1	onb	Financing Receivable Number Of Loan Portfolios FinancingReceivableNumberOfLoanPortfolios	4	portfolio
CY2021Q1	onb	Financing Receivable Number Of Loan Segments FinancingReceivableNumberOfLoanSegments	7	segment
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	13925261000	USD
CY2021Q1	onb	Interest Receivable Loans InterestReceivableLoans	53700000	USD
CY2020Q4	onb	Interest Receivable Loans InterestReceivableLoans	57300000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	131388000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	1570000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1575000	USD
CY2021Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-17356000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	114037000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	54619000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	8445000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1909000	USD
CY2020Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	16950000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	106380000	USD
CY2021Q1	onb	Finance Receivable Past Due Period For Nonaccrual Status FinanceReceivablePastDuePeriodForNonaccrualStatus	P90D
CY2021Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	142138000	USD
CY2021Q1	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	44115000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	49000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	147339000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	25618000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	167000	USD
CY2021Q1	onb	Loan Participations LoanParticipations	1108000000	USD
CY2021Q1	onb	Loan Participations Sold LoanParticipationsSold	496300000	USD
CY2021Q1	onb	Loan Participations Retained LoanParticipationsRetained	611800000	USD
CY2021Q1	onb	Troubled Debt Restructuring Modified Term TroubledDebtRestructuringModifiedTerm	P6M
CY2021Q1	onb	Loan Charge Off To Be Recorded Minimum Period LoanChargeOffToBeRecordedMinimumPeriod	P120D
CY2021Q1	onb	Loan Charge Off To Be Recorded Maximum Period LoanChargeOffToBeRecordedMaximumPeriod	P180D
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	32653000	USD
CY2021Q1	onb	Financing Receivable Troubled Debt Restructuring Write Offs Recoveries Net FinancingReceivableTroubledDebtRestructuringWriteOffsRecoveriesNet	-15000	USD
CY2021Q1	onb	Financing Receivable Troubled Debt Restructuring Payments Disbursements FinancingReceivableTroubledDebtRestructuringPaymentsDisbursements	1931000	USD
CY2021Q1	onb	Financing Receivable Troubled Debt Restructuring Additions Removals Net FinancingReceivableTroubledDebtRestructuringAdditionsRemovalsNet	-1171000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	29566000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	31738000	USD
CY2020Q1	onb	Financing Receivable Troubled Debt Restructuring Write Offs Recoveries Net FinancingReceivableTroubledDebtRestructuringWriteOffsRecoveriesNet	1961000	USD
CY2020Q1	onb	Financing Receivable Troubled Debt Restructuring Payments Disbursements FinancingReceivableTroubledDebtRestructuringPaymentsDisbursements	1103000	USD
CY2020Q1	onb	Financing Receivable Troubled Debt Restructuring Additions Removals Net FinancingReceivableTroubledDebtRestructuringAdditionsRemovalsNet	0	USD
CY2020Q1	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	28674000	USD
CY2020Q4	onb	Financing Receivable Troubled Debt Restructurings Included With Non Accrual Loan FinancingReceivableTroubledDebtRestructuringsIncludedWithNonAccrualLoan	14900000	USD
CY2021Q1	onb	Financing Receivable Troubled Debt Restructurings Included With Non Accrual Loan FinancingReceivableTroubledDebtRestructuringsIncludedWithNonAccrualLoan	14300000	USD
CY2021Q1	onb	Financing Receivable Troubled Debt Restructurings Specific Reserves FinancingReceivableTroubledDebtRestructuringsSpecificReserves	800000	USD
CY2020Q4	onb	Financing Receivable Troubled Debt Restructurings Specific Reserves FinancingReceivableTroubledDebtRestructuringsSpecificReserves	1600000	USD
CY2021Q1	onb	Financing Receivable Troubled Debt Restructuring Number Of Loans Qualified For Removal FinancingReceivableTroubledDebtRestructuringNumberOfLoansQualifiedForRemoval	1	loan
CY2021Q1	onb	Loan To Be Considered As Payment Default In Period LoanToBeConsideredAsPaymentDefaultInPeriod	P90D
CY2020Q4	us-gaap	Other Real Estate OtherRealEstate	1324000	USD
CY2019Q4	us-gaap	Other Real Estate OtherRealEstate	2169000	USD
CY2021Q1	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	130000	USD
CY2020Q1	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	146000	USD
CY2021Q1	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	632000	USD
CY2020Q1	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	113000	USD
CY2021Q1	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	71000	USD
CY2020Q1	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	39000	USD
CY2021Q1	us-gaap	Other Real Estate OtherRealEstate	751000	USD
CY2020Q1	us-gaap	Other Real Estate OtherRealEstate	2163000	USD
CY2021Q1	us-gaap	Foreclosed Assets ForeclosedAssets	200000	USD
CY2020Q1	us-gaap	Foreclosed Assets ForeclosedAssets	400000	USD
CY2021Q1	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	400000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	800000	USD
CY2021Q1	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	3700000	USD
CY2020Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	2700000	USD
CY2021Q1	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	607187000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	601729000	USD
CY2021Q1	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	140628000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	137321000	USD
CY2021Q1	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	466559000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	464408000	USD
CY2021Q1	us-gaap	Depreciation Depreciation	7100000	USD
CY2020Q1	us-gaap	Depreciation Depreciation	8600000	USD
CY2021Q1	us-gaap	Lease Cost LeaseCost	3564000	USD
CY2020Q1	us-gaap	Lease Cost LeaseCost	9298000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	74611000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	76197000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	84665000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	86598000	USD
CY2021Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	11040000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	11351000	USD
CY2021Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	11561000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	11813000	USD
CY2021Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y4M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y7M6D
CY2021Q1	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y1M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y3M18D
CY2021Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0338
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0340
CY2021Q1	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0348
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0346
CY2021Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	3636000	USD
CY2020Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	4193000	USD
CY2021Q1	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	95000	USD
CY2020Q1	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	78000	USD
CY2021Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	251000	USD
CY2020Q1	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	122000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	10706000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	1048000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	13424000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1412000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	9721000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	1438000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	8557000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	1444000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	8373000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	1437000	USD
CY2021Q1	onb	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	50549000	USD
CY2021Q1	onb	Finance Lease Liability To Be Paid After Year Four FinanceLeaseLiabilityToBePaidAfterYearFour	7006000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	101330000	USD
CY2021Q1	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	13785000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	16665000	USD
CY2021Q1	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	2224000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	84665000	USD
CY2021Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	11561000	USD
CY2021Q1	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	1747000	USD
CY2021Q1	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	1907000	USD
CY2021Q1	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	1526000	USD
CY2021Q1	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	1396000	USD
CY2021Q1	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	1083000	USD
CY2021Q1	onb	Lessor Operating Lease Payment To Be Received After Year Four LessorOperatingLeasePaymentToBeReceivedAfterYearFour	2922000	USD
CY2021Q1	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	10581000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1036994000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1036994000	USD
CY2021Q1	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2020Q1	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2021Q1	us-gaap	Goodwill Goodwill	1036994000	USD
CY2020Q1	us-gaap	Goodwill Goodwill	1036994000	USD
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	119811000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	76872000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	42939000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	129270000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	83256000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	46014000	USD
CY2021Q1	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2020Q1	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3100000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3800000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	8261000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9014000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7053000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5645000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4509000	USD
CY2021Q1	onb	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	8457000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	42939000	USD
CY2021Q1	us-gaap	Servicing Asset ServicingAsset	28100000	USD
CY2020Q4	us-gaap	Servicing Asset ServicingAsset	26700000	USD
CY2021Q1	onb	Principal Balance Of Loans Serviced For Others PrincipalBalanceOfLoansServicedForOthers	3597000000	USD
CY2020Q4	onb	Principal Balance Of Loans Serviced For Others PrincipalBalanceOfLoansServicedForOthers	3613000000	USD
CY2021Q1	us-gaap	Escrow Deposit EscrowDeposit	32900000	USD
CY2020Q4	us-gaap	Escrow Deposit EscrowDeposit	16200000	USD
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	28124000	USD
CY2019Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	25399000	USD
CY2021Q1	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	3113000	USD
CY2020Q1	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	1731000	USD
CY2021Q1	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	2975000	USD
CY2020Q1	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	1555000	USD
CY2021Q1	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	28262000	USD
CY2019Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	31000	USD
CY2020Q1	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	25575000	USD
CY2020Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	1407000	USD
CY2021Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-1261000	USD
CY2020Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	1412000	USD
CY2021Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	146000	USD
CY2020Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	1443000	USD
CY2021Q1	us-gaap	Servicing Asset ServicingAsset	28116000	USD
CY2020Q1	us-gaap	Servicing Asset ServicingAsset	24132000	USD
CY2021Q1	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	30700000	USD
CY2021Q1	onb	Fair Value Inputs Discount Rate1 FairValueInputsDiscountRate1	0.09
CY2021Q1	onb	Fair Value Inputs Weighted Average Prepayment Speed FairValueInputsWeightedAveragePrepaymentSpeed	0.11
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	26800000	USD
CY2020	onb	Fair Value Inputs Discount Rate1 FairValueInputsDiscountRate1	0.09
CY2020Q4	onb	Fair Value Inputs Weighted Average Prepayment Speed FairValueInputsWeightedAveragePrepaymentSpeed	0.14
CY2021Q1	onb	Investments In Qualified Affordable Housing Projects InvestmentsInQualifiedAffordableHousingProjects	64371000	USD
CY2021Q1	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	26571000	USD
CY2020Q4	onb	Investments In Qualified Affordable Housing Projects InvestmentsInQualifiedAffordableHousingProjects	62000000	USD
CY2020Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	30105000	USD
CY2021Q1	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2064000	USD
CY2021Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	2843000	USD
CY2020Q1	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	6291000	USD
CY2020Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	2775000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	395242000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	431166000	USD
CY2020Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	318067000	USD
CY2021Q1	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	398662000	USD
CY2020Q1	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	329091000	USD
CY2021Q1	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	395242000	USD
CY2020Q1	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	318067000	USD
CY2021Q1	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0012
CY2020Q1	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0047
CY2021Q1	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0012
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0012
CY2020Q1	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0022
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	395242000	USD
CY2021Q1	onb	Percentage Pledged Securities Of Repurchase Agreements Outstanding Balance PercentagePledgedSecuritiesOfRepurchaseAgreementsOutstandingBalance	1.06
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	1924155000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	1999160000	USD
CY2021Q1	onb	Advances From Federal Home Loan Banks Fair Value Hedge Basis Adjustments And Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksFairValueHedgeBasisAdjustmentsAndUnamortizedPrepaymentFees	11614000	USD
CY2020Q4	onb	Advances From Federal Home Loan Banks Fair Value Hedge Basis Adjustments And Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksFairValueHedgeBasisAdjustmentsAndUnamortizedPrepaymentFees	7725000	USD
CY2021Q1	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1912541000	USD
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1991435000	USD
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0132
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0132
CY2021Q1	onb	Advances From Federal Home Loan Banks Modifications Amount AdvancesFromFederalHomeLoanBanksModificationsAmount	50000000.0	USD
CY2021Q1	onb	Advances From Federal Home Loan Banks Modifications Number Of Contracts AdvancesFromFederalHomeLoanBanksModificationsNumberOfContracts	2	advance
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0153
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0033
CY2021Q1	onb	Advances From Federal Home Loan Banks Modifications Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksModificationsUnamortizedPrepaymentFees	30700000	USD
CY2020Q4	onb	Advances From Federal Home Loan Banks Modifications Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksModificationsUnamortizedPrepaymentFees	30000000.0	USD
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Remainder Of Fiscal Year FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRemainderOfFiscalYear	20000000	USD
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	29000000	USD
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	155000	USD
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	25000000	USD
CY2021Q1	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	550000000	USD
CY2021Q1	onb	Federal Home Loan Bank Advance Maturity After Year Four FederalHomeLoanBankAdvanceMaturityAfterYearFour	1300000000	USD
CY2021Q1	onb	Advances From Federal Home Loan Banks Fair Value Hedge Basis Adjustments And Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksFairValueHedgeBasisAdjustmentsAndUnamortizedPrepaymentFees	11614000	USD
CY2021Q1	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1912541000	USD
CY2021Q1	us-gaap	Other Borrowings OtherBorrowings	266282000	USD
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	252787000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	774000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1073000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1132000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	176170000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1198000	USD
CY2021Q1	onb	Long Term Debt Maturity After Year Four LongTermDebtMaturityAfterYearFour	85869000	USD
CY2021Q1	onb	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net And Other Basis Adjustments DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNetAndOtherBasisAdjustments	-66000	USD
CY2021Q1	us-gaap	Other Borrowings OtherBorrowings	266282000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-54234000	USD
CY2021Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1628000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	86255000	USD
CY2020Q1	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	4305000	USD
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2500000	shares
CY2021Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2021Q1	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	21934000	USD
CY2020Q1	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	5372000	USD
CY2021Q1	onb	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	2779000	USD
CY2020Q1	onb	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	2632000	USD
CY2021Q1	onb	Income Tax Reconciliation Non Deductible Expense Interest Disallowance IncomeTaxReconciliationNonDeductibleExpenseInterestDisallowance	33000	USD
CY2020Q1	onb	Income Tax Reconciliation Non Deductible Expense Interest Disallowance IncomeTaxReconciliationNonDeductibleExpenseInterestDisallowance	73000	USD
CY2021Q1	onb	Effective Income Tax Rate Reconciliation Tax Exempt Income Life Insurance Amount EffectiveIncomeTaxRateReconciliationTaxExemptIncomeLifeInsuranceAmount	544000	USD
CY2020Q1	onb	Effective Income Tax Rate Reconciliation Tax Exempt Income Life Insurance Amount EffectiveIncomeTaxRateReconciliationTaxExemptIncomeLifeInsuranceAmount	647000	USD
CY2021Q1	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3290000	USD
CY2020Q1	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3206000	USD
CY2021Q1	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2974000	USD
CY2020Q1	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-8000	USD
CY2021Q1	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-1775000	USD
CY2020Q1	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	3267000	USD
CY2020Q4	onb	Deferred Tax Assets Deferred Gain On Securities DeferredTaxAssetsDeferredGainOnSecurities	2102000	USD
CY2021Q1	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1092000	USD
CY2020Q1	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1902000	USD
CY2021Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1121000	USD
CY2020Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-584000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17630000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2939000	USD
CY2021Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.169
CY2020Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.115
CY2021Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	30374000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	34971000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	11136000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	20076000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	15553000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	18982000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1332000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	0	USD
CY2021Q1	onb	Deferred Tax Assets Deferred Gain On Securities DeferredTaxAssetsDeferredGainOnSecurities	1786000	USD
CY2021Q1	onb	Deferred Tax Assets Acquired Loan DeferredTaxAssetsAcquiredLoan	10912000	USD
CY2020Q4	onb	Deferred Tax Assets Acquired Loan DeferredTaxAssetsAcquiredLoan	11989000	USD
CY2021Q1	onb	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	23710000	USD
CY2020Q4	onb	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	24245000	USD
CY2021Q1	onb	Deferred Tax Assets Investments And Other Partnerships DeferredTaxAssetsInvestmentsAndOtherPartnerships	968000	USD
CY2020Q4	onb	Deferred Tax Assets Investments And Other Partnerships DeferredTaxAssetsInvestmentsAndOtherPartnerships	1054000	USD
CY2021Q1	onb	Deferred Tax Assets Other Real Estate Owned DeferredTaxAssetsOtherRealEstateOwned	6000	USD
CY2020Q4	onb	Deferred Tax Assets Other Real Estate Owned DeferredTaxAssetsOtherRealEstateOwned	28000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	720000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	460000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	96497000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	113907000	USD
CY2021Q1	onb	Deferred Tax Liabilities Purchase Accounting DeferredTaxLiabilitiesPurchaseAccounting	18365000	USD
CY2020Q4	onb	Deferred Tax Liabilities Purchase Accounting DeferredTaxLiabilitiesPurchaseAccounting	18232000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	6928000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	6582000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13972000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	14008000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	956000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	955000	USD
CY2021Q1	onb	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	21105000	USD
CY2020Q4	onb	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	21569000	USD
CY2021Q1	onb	Deferred Tax Liabilities Unrealized Gains On Available For Sale Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleInvestmentSecurities	24327000	USD
CY2020Q4	onb	Deferred Tax Liabilities Unrealized Gains On Available For Sale Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleInvestmentSecurities	40756000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	1800000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	1080000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1557000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1555000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	89010000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	104737000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	7487000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	9170000	USD
CY2021Q1	us-gaap	Bad Debt Reserve For Tax Purposes Of Qualified Lender BadDebtReserveForTaxPurposesOfQualifiedLender	52800000	USD
CY2021Q1	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Bad Debt Reserve For Tax Purposes Of Qualified Lender DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender	13000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2021Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1300000	USD
CY2021Q1	onb	Percentage Of Periodic Changes In Fair Value Qualifies For Hedge Accounting PercentageOfPeriodicChangesInFairValueQualifiesForHedgeAccounting	1
CY2021Q1	onb	Loan Commitments LoanCommitments	3851000000	USD
CY2021Q1	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	75100000	USD
CY2021Q1	us-gaap	Loans And Leases Receivable Commitments Fixed Rates LoansAndLeasesReceivableCommitmentsFixedRates	3613000000	USD
CY2021Q1	us-gaap	Loans And Leases Receivable Commitments Variable Rates LoansAndLeasesReceivableCommitmentsVariableRates	238300000	USD
CY2021Q1	onb	Loan Commitments Floating Interest Rate Minimum LoanCommitmentsFloatingInterestRateMinimum	0
CY2021Q1	onb	Loan Commitments Floating Interest Rate Maximum LoanCommitmentsFloatingInterestRateMaximum	0.14
CY2020Q4	onb	Loan Commitments LoanCommitments	3720000000	USD
CY2020Q4	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	86900000	USD
CY2021Q1	onb	Allowance For Unfunded Loan Commitments AllowanceForUnfundedLoanCommitments	10400000	USD
CY2020Q4	onb	Allowance For Unfunded Loan Commitments AllowanceForUnfundedLoanCommitments	11700000	USD
CY2020Q4	onb	Credit Extended CreditExtended	7900000	USD
CY2021Q1	onb	Credit Extended CreditExtended	7900000	USD
CY2020Q4	onb	Credit Extensions With Collateral CreditExtensionsWithCollateral	7500000	USD
CY2021Q1	onb	Credit Extensions With Collateral CreditExtensionsWithCollateral	7500000	USD
CY2021Q1	onb	Term Of Standby Letters Of Credit TermOfStandbyLettersOfCredit	P1Y
CY2021Q1	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	75100000	USD
CY2021Q1	onb	Carrying Value Of Letter Of Credit CarryingValueOfLetterOfCredit	500000	USD
CY2020Q4	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	86900000	USD
CY2020Q4	onb	Carrying Value Of Letter Of Credit CarryingValueOfLetterOfCredit	500000	USD
CY2020Q1	onb	Other Real Estate Owned Property Write Down OtherRealEstateOwnedPropertyWriteDown	11000	USD
CY2021Q1	onb	Other Real Estate Owned And Other Repossessed Property OtherRealEstateOwnedAndOtherRepossessedProperty	15000	USD
CY2021Q1	onb	Other Real Estate Owned Property Write Down OtherRealEstateOwnedPropertyWriteDown	23000	USD
CY2021Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	100000	USD
CY2021Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-1300000	USD
CY2020Q1	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	1400000	USD
CY2020Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	1400000	USD
CY2021Q1	onb	Past Due Period Of Mortgage Loans Held For Sale PastDuePeriodOfMortgageLoansHeldForSale	P90D
CY2021Q1	us-gaap	Interest And Fee Income Loans Commercial And Residential Real Estate InterestAndFeeIncomeLoansCommercialAndResidentialRealEstate	400000	USD
CY2020Q1	us-gaap	Interest And Fee Income Loans Commercial And Residential Real Estate InterestAndFeeIncomeLoansCommercialAndResidentialRealEstate	400000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	30158000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	31007000	USD

Files In Submission

Name	View Source	Status
0000707179-21-000032-index-headers.html	Edgar Link	pending
0000707179-21-000032-index.html	Edgar Link	pending
0000707179-21-000032.txt	Edgar Link	pending
0000707179-21-000032-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image_01.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
onb-20210331.htm	Edgar Link	pending
onb-20210331.xsd	Edgar Link	pending
onb-20210331_cal.xml	Edgar Link	unprocessable
onb-20210331_def.xml	Edgar Link	unprocessable
onb-20210331_htm.xml	Edgar Link	completed
onb-20210331_lab.xml	Edgar Link	unprocessable
onb-20210331_pre.xml	Edgar Link	unprocessable
onb_exhibit101.htm	Edgar Link	pending
onb_exhibit102.htm	Edgar Link	pending
onb_exhibit103.htm	Edgar Link	pending
onb_exhibit3111q21.htm	Edgar Link	pending
onb_exhibit3121q21.htm	Edgar Link	pending
onb_exhibit3211q21.htm	Edgar Link	pending
onb_exhibit3221q21.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
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2021 Q1 Form 10-Q Financial Statement

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$ONB Old National Bancorp Stock $onb

2021 Q1 Form 10-Q Financial Statement

#000070717921000032 Filed on April 28, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ONB
Old National Bancorp Stock $onb