$ONB
Old National Bancorp Stock $onb

$onb Overview Financials Valuation SEC Filings Company Website

2021 Q3 Form 10-Q Financial Statement

#000070717921000084 Filed on October 27, 2021

Income Statement

Concept	2021 Q3	2020 Q3	2020 Q2
Revenue	$162.0M	$160.1M	$162.0M
YoY Change	1.21%	-13.86%	-14.33%
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	$6.500M	$6.800M	$6.500M
YoY Change	-4.41%	0.0%	-2.99%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$10.45M	$14.51M	$16.30M
YoY Change	-27.97%	-55.69%	-51.81%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$89.43M	$90.10M	$61.47M
YoY Change	-0.75%	8.51%	-20.51%
Income Tax	$17.68M	$12.15M	$9.761M
% Of Pretax Income	19.77%	13.49%	15.88%
Net Earnings	$71.75M	$77.94M	$51.71M
YoY Change	-7.95%	11.7%	-17.88%
Net Earnings / Revenue	44.28%	48.69%	31.92%
Basic Earnings Per Share	$0.43	$0.47	$0.32
Diluted Earnings Per Share	$0.43	$0.47	$0.32
COMMON SHARES
Basic Shares Outstanding	165.3M shares	164.8M shares	164.7M shares
Diluted Shares Outstanding	165.9M shares	165.4M shares	165.3M shares

Balance Sheet

Concept	2021 Q3	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$797.5M	$330.8M	$310.5M
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	$546.0M	$463.3M	$462.8M
YoY Change	17.86%	-5.86%	-6.22%
Goodwill	$1.037B	$1.037B	$1.037B
YoY Change	0.0%	0.0%	0.07%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$15.00M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$24.02B	$22.46B	$22.10B
YoY Change	6.94%	9.89%	9.71%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$250.0M	$307.0M	$277.0M
YoY Change	-18.57%	-1.29%	16.88%
Deferred Revenue
YoY Change
Short-Term Debt	$375.0M	$400.0M	$369.0M
YoY Change	-6.25%	-30.8%	-50.47%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$250.0M	$307.0M	$277.0M
YoY Change	-18.57%	-1.29%	16.88%
LONG-TERM LIABILITIES
Long-Term Debt	$271.0M	$238.0M	$238.0M
YoY Change	13.87%	-5.56%	-5.56%
Other Long-Term Liabilities	-$14.00M	$12.00M	$29.00M
YoY Change	-216.67%	-70.0%	-32.56%
Total Long-Term Liabilities	$257.0M	$250.0M	$267.0M
YoY Change	2.8%	-14.38%	-9.49%
TOTAL LIABILITIES
Total Short-Term Liabilities	$250.0M	$307.0M	$277.0M
Total Long-Term Liabilities	$257.0M	$250.0M	$267.0M
Total Liabilities	$20.98B	$19.54B	$19.24B
YoY Change	7.39%	10.98%	10.93%
SHAREHOLDERS EQUITY
Retained Earnings	$935.2M	$733.0M	$678.4M
YoY Change	27.57%		11.64%
Common Stock	$2.044B	$2.039B	$2.037B
YoY Change	0.25%		-5.41%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.036B	$2.921B	$2.864B
YoY Change
Total Liabilities & Shareholders Equity	$24.02B	$22.46B	$22.10B
YoY Change	6.94%	9.89%	9.71%

Cashflow Statement

Concept	2021 Q3	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$71.75M	$77.94M	$51.71M
YoY Change	-7.95%	11.7%	-17.88%
Depreciation, Depletion And Amortization	$6.500M	$6.800M	$6.500M
YoY Change	-4.41%	0.0%	-2.99%
Cash From Operating Activities	$99.50M	$135.3M	-$15.50M
YoY Change	-26.46%	113.74%	-138.37%
INVESTING ACTIVITIES
Capital Expenditures	-$6.400M	-$8.200M	-$10.80M
YoY Change	-21.95%	15.49%	-12.2%
Acquisitions
YoY Change
Other Investing Activities	-$67.40M	-$363.3M	-$1.395B
YoY Change	-81.45%	407.4%	19542.25%
Cash From Investing Activities	-$73.80M	-$371.5M	-$1.405B
YoY Change	-80.13%	372.05%	7106.67%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	280.6M	256.5M	1.388B
YoY Change	9.4%	90.56%	-3327.91%
NET CHANGE
Cash From Operating Activities	99.50M	135.3M	-15.50M
Cash From Investing Activities	-73.80M	-371.5M	-1.405B
Cash From Financing Activities	280.6M	256.5M	1.388B
Net Change In Cash	306.3M	20.30M	-32.80M
YoY Change	1408.87%	-82.97%	48.42%
FREE CASH FLOW
Cash From Operating Activities	$99.50M	$135.3M	-$15.50M
Capital Expenditures	-$6.400M	-$8.200M	-$10.80M
Free Cash Flow	$105.9M	$143.5M	-$4.700M
YoY Change	-26.2%	103.84%	-108.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Registrant Name EntityRegistrantName	Old National Bancorp /IN/
	dei	Entity Central Index Key EntityCentralIndexKey	0000707179
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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	dei	Document Type DocumentType	10-Q
CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherBorrowings
CY2021Q3	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherBorrowings
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-15817
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	IN
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	35-1539838
	dei	Entity Address Address Line1 EntityAddressAddressLine1	One Main Street
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	47708
	dei	Entity Address City Or Town EntityAddressCityOrTown	Evansville,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	IN
	dei	City Area Code CityAreaCode	(800)
	dei	Local Phone Number LocalPhoneNumber	731-2265
	dei	Security12b Title Security12bTitle	Common Stock, No Par Value
	dei	Trading Symbol TradingSymbol	ONB
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2021Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	156185000	USD
CY2020Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	145573000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	476517000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	395520000	USD
CY2021Q3	onb	Fees And Commission Fiduciary And Trust Activities FeesAndCommissionFiduciaryAndTrustActivities	10134000	USD
CY2020Q3	onb	Fees And Commission Fiduciary And Trust Activities FeesAndCommissionFiduciaryAndTrustActivities	9239000	USD
	onb	Fees And Commission Fiduciary And Trust Activities FeesAndCommissionFiduciaryAndTrustActivities	30576000	USD
	onb	Fees And Commission Fiduciary And Trust Activities FeesAndCommissionFiduciaryAndTrustActivities	27547000	USD
CY2021Q3	onb	Fees And Commissions Depositor Account FeesAndCommissionsDepositorAccount	8926000	USD
CY2020Q3	onb	Fees And Commissions Depositor Account FeesAndCommissionsDepositorAccount	8698000	USD
	onb	Fees And Commissions Depositor Account FeesAndCommissionsDepositorAccount	25564000	USD
	onb	Fees And Commissions Depositor Account FeesAndCommissionsDepositorAccount	26357000	USD
CY2021Q3	onb	Debit Card And Atm Fees DebitCardAndAtmFees	4942000	USD
CY2020Q3	onb	Debit Card And Atm Fees DebitCardAndAtmFees	5276000	USD
	onb	Debit Card And Atm Fees DebitCardAndAtmFees	15668000	USD
	onb	Debit Card And Atm Fees DebitCardAndAtmFees	15106000	USD
CY2021Q3	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	10870000	USD
CY2020Q3	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	18110000	USD
	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	35222000	USD
	us-gaap	Fees And Commissions Mortgage Banking And Servicing FeesAndCommissionsMortgageBankingAndServicing	46542000	USD
CY2021Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	6475000	USD
CY2020Q3	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	5351000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	18381000	USD
	us-gaap	Brokerage Commissions Revenue BrokerageCommissionsRevenue	16070000	USD
CY2021Q3	onb	Capital Markets Income CapitalMarketsIncome	6017000	USD
CY2020Q3	onb	Capital Markets Income CapitalMarketsIncome	5428000	USD
	onb	Capital Markets Income CapitalMarketsIncome	15603000	USD
	onb	Capital Markets Income CapitalMarketsIncome	15935000	USD
CY2021Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2355000	USD
CY2020Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2830000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	7852000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	8878000	USD
CY2021Q3	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1207000	USD
CY2020Q3	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	4921000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	3892000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	10606000	USD
CY2021Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3589000	USD
CY2020Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	4906000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9977000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	13681000	USD
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	54515000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	64759000	USD
	us-gaap	Noninterest Income NoninterestIncome	162735000	USD
	us-gaap	Noninterest Income NoninterestIncome	180722000	USD
CY2021Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	71005000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	69860000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	211762000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	215589000	USD
CY2021Q3	us-gaap	Occupancy Net OccupancyNet	12757000	USD
CY2020Q3	us-gaap	Occupancy Net OccupancyNet	13930000	USD
	us-gaap	Occupancy Net OccupancyNet	41683000	USD
	us-gaap	Occupancy Net OccupancyNet	42308000	USD
CY2021Q3	us-gaap	Equipment Expense EquipmentExpense	3756000	USD
CY2020Q3	us-gaap	Equipment Expense EquipmentExpense	3754000	USD
	us-gaap	Equipment Expense EquipmentExpense	12231000	USD
	us-gaap	Equipment Expense EquipmentExpense	12912000	USD
CY2021Q3	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	3267000	USD
CY2020Q3	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	2140000	USD
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	7961000	USD
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	7632000	USD
CY2021Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	11508000	USD
CY2020Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	9628000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	35558000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	28724000	USD
CY2021Q3	us-gaap	Communication Communication	2372000	USD
CY2020Q3	us-gaap	Communication Communication	2241000	USD
	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-8917000	USD
	us-gaap	Communication Communication	7661000	USD
	us-gaap	Communication Communication	7335000	USD
CY2021Q3	us-gaap	Professional Fees ProfessionalFees	3416000	USD
CY2020Q3	us-gaap	Professional Fees ProfessionalFees	3083000	USD
	us-gaap	Professional Fees ProfessionalFees	14668000	USD
	us-gaap	Professional Fees ProfessionalFees	10921000	USD
CY2021Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1628000	USD
CY2020Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1319000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4461000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4942000	USD
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2779000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3459000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8763000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10847000	USD
CY2021Q3	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1736000	USD
CY2020Q3	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-3115000	USD
	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-4751000	USD
CY2021Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	7050000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	7705000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	19133000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	48972000	USD
CY2021Q3	us-gaap	Noninterest Expense NoninterestExpense	121274000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	120234000	USD
	us-gaap	Noninterest Expense NoninterestExpense	368632000	USD
	us-gaap	Noninterest Expense NoninterestExpense	399099000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	89426000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	90098000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	270620000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	177143000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17680000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12154000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49270000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24854000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	71746000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	77944000	USD
	us-gaap	Net Income Loss NetIncomeLoss	221350000	USD
	us-gaap	Net Income Loss NetIncomeLoss	152289000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.92
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.92
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165258000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164773000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165144000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165748000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165939000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165419000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165862000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	166370000	shares
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.42
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.42
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	71746000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	77944000	USD
	us-gaap	Net Income Loss NetIncomeLoss	221350000	USD
	us-gaap	Net Income Loss NetIncomeLoss	152289000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-3595000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6599000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-112927000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	126281000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1207000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	4921000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3892000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	10606000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-627000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	281000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-26404000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	25598000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-4175000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1397000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-90415000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	90077000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-164000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-11000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	2612000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	7546000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1578000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1550000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	3483000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	3651000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-428000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-111000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-62000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-384000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-214000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	957000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1314000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1177000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-657000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2938000	USD
CY2021Q3	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
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-28000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-147000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-82000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-12000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-7000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-36000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-20000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-37000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-21000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5452000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	241000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-90961000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	93077000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	66294000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	78185000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	130389000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	245366000	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
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	51705000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10886000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2020Q2	us-gaap	Dividends Common Stock DividendsCommonStock	23113000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	145000	USD
CY2020Q2	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	473000	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1480000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	190000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	2864255000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	77944000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	241000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2020Q3	us-gaap	Dividends Common Stock DividendsCommonStock	23147000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	136000	USD
CY2020Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	14000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1734000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	2921149000	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
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	62786000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-29647000	USD
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2021Q2	us-gaap	Dividends Common Stock DividendsCommonStock	23202000	USD
CY2021Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	143000	USD
CY2021Q2	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	449000	USD
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1816000	USD
CY2021Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	224000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	2991118000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	71746000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5452000	USD
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2021Q3	us-gaap	Dividends Common Stock DividendsCommonStock	23214000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	147000	USD
CY2021Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	408000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1955000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	0	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	3035892000	USD
	us-gaap	Net Income Loss NetIncomeLoss	221350000	USD
	us-gaap	Net Income Loss NetIncomeLoss	152289000	USD
	us-gaap	Depreciation Depreciation	20585000	USD
	us-gaap	Depreciation Depreciation	21807000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8763000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10847000	USD
	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-4751000	USD
	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-8917000	USD
	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-11793000	USD
	us-gaap	Investment Income Net Amortization Of Discount And Premium InvestmentIncomeNetAmortizationOfDiscountAndPremium	-14664000	USD
	onb	Net Accretion Of Premiums And Discounts From Acquired Loans NetAccretionOfPremiumsAndDiscountsFromAcquiredLoans	12818000	USD
	onb	Net Accretion Of Premiums And Discounts From Acquired Loans NetAccretionOfPremiumsAndDiscountsFromAcquiredLoans	17883000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5518000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5962000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-26898000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	39495000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	3892000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	10606000	USD
	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	27433000	USD
	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	8636000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	7852000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	8878000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	929943000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	1114932000	USD
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	967573000	USD
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	1099258000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-11268000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-2071000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-46203000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	96468000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-24295000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	764000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	264673000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	98671000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2550248000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1859755000	USD
	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	0	USD
	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	10025000	USD
	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	10000000	USD
	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	0	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1174037000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1475609000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	189091000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	296075000	USD
	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	50000	USD
	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	4672000	USD
	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	437000	USD
	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	39218000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-217847000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1756697000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2652000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1870000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	16741000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	7014000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	40774000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26865000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1000167000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1828884000	USD
	us-gaap	Net Change Interest Bearing Deposits Domestic NetChangeInterestBearingDepositsDomestic	1158696000	USD
	us-gaap	Net Change Interest Bearing Deposits Domestic NetChangeInterestBearingDepositsDomestic	1953097000	USD
	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	1132000	USD
	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	349155000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-55919000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	71359000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	11651000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-429000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	145005000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	550004000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	6964566000	USD
	onb	Payments Of Fhl Bank Borrowings Modifications Financing Activities PaymentsOfFHLBankBorrowingsModificationsFinancingActivities	2156000	USD
	onb	Payments Of Fhl Bank Borrowings Modifications Financing Activities PaymentsOfFHLBankBorrowingsModificationsFinancingActivities	13570000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	50000000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	825000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	69611000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	69795000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3713000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	82309000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	429000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	432000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	943240000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1784626000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	207746000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	54413000	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
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	797458000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	330750000	USD
	us-gaap	Interest Paid Net InterestPaidNet	33910000	USD
	us-gaap	Interest Paid Net InterestPaidNet	59037000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	15476000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	15836000	USD
	onb	Investment Securities Purchased But Not Settled InvestmentSecuritiesPurchasedButNotSettled	594000	USD
	onb	Investment Securities Purchased But Not Settled InvestmentSecuritiesPurchasedButNotSettled	50317000	USD
	onb	Net Reduction In Operating Lease Right Of Use Asset Modifications NetReductionInOperatingLeaseRightOfUseAssetModifications	1190000	USD
	onb	Net Reduction In Operating Lease Right Of Use Asset Modifications NetReductionInOperatingLeaseRightOfUseAssetModifications	1133000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	6367000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	5225000	USD
CY2021Q3	us-gaap	Share Price SharePrice	16.95
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	7900000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	71746000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	77944000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	221350000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	152289000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165258000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164773000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165144000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165748000	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.92
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	71746000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	77944000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	221350000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	152289000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165258000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164773000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165144000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	165748000	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	660000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	166370000	shares
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	611000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	696000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	586000	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	21000	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	35000	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	22000	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	36000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165939000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165419000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	165862000	shares
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.92
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
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	143187000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	73677000	USD
CY2021Q3	onb	Debt Securities Available For Sale Accumulated Basis Adjustments Before Tax DebtSecuritiesAvailableForSaleAccumulatedBasisAdjustmentsBeforeTax	-6126000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	7027950000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	5784754000	USD
CY2020Q4	onb	Debt Securities Available For Sale Accumulated Basis Adjustments Before Tax DebtSecuritiesAvailableForSaleAccumulatedBasisAdjustmentsBeforeTax	-968000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	5970115000	USD
CY2021Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	121376000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	39637000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	189091000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	296075000	USD
CY2021Q3	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables Categorized As Available For Sale ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale	54966000	USD
CY2020Q3	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables Categorized As Available For Sale ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale	82410000	USD
	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables Categorized As Available For Sale ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale	111961000	USD
	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables Categorized As Available For Sale ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale	388145000	USD
CY2021Q3	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	176342000	USD
CY2020Q3	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	122047000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	301052000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	684220000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1093000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	4942000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	3829000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	11082000	USD
CY2021Q3	onb	Realized Gains On Calls Of Available For Sale Securities RealizedGainsOnCallsOfAvailableForSaleSecurities	119000	USD
CY2020Q3	onb	Realized Gains On Calls Of Available For Sale Securities RealizedGainsOnCallsOfAvailableForSaleSecurities	10000	USD
	onb	Realized Gains On Calls Of Available For Sale Securities RealizedGainsOnCallsOfAvailableForSaleSecurities	180000	USD
	onb	Realized Gains On Calls Of Available For Sale Securities RealizedGainsOnCallsOfAvailableForSaleSecurities	50000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	30000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	85000	USD
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	500000	USD
CY2021Q3	onb	Realized Loss On Calls Of Available For Sale Securities RealizedLossOnCallsOfAvailableForSaleSecurities	5000	USD
CY2020Q3	onb	Realized Loss On Calls Of Available For Sale Securities RealizedLossOnCallsOfAvailableForSaleSecurities	1000	USD
	onb	Realized Loss On Calls Of Available For Sale Securities RealizedLossOnCallsOfAvailableForSaleSecurities	32000	USD
	onb	Realized Loss On Calls Of Available For Sale Securities RealizedLossOnCallsOfAvailableForSaleSecurities	26000	USD
CY2021Q3	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1207000	USD
CY2020Q3	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	4921000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	3892000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	10606000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	148758000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	150704000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Maturity Within One Year Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityWithinOneYearWeightedAverageYield	0.0256
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2625098000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2657122000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Maturity After One Through Five Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityAfterOneThroughFiveYearsWeightedAverageYield	0.0201
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1827081000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1816752000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Maturity After Five Through Ten Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityAfterFiveThroughTenYearsWeightedAverageYield	0.0182
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	2363629000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	2403372000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Maturity After10 Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityAfter10YearsWeightedAverageYield	0.0243
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	6964566000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	7027950000	USD
CY2021Q3	onb	Available For Sale Securities Debt Maturities Weighted Average Yield AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageYield	0.0211
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	3128288000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	64711000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	378065000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	8966000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3506353000	USD
CY2020Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	500000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	1300000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	73677000	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
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	25600000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	27000000	USD
CY2021Q3	onb	Number Of Securities In Security Portfolio NumberOfSecuritiesInSecurityPortfolio	1925	security
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	329	security
CY2021Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	12400000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	2500000	USD
CY2021Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	100000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	300000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	107868000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4252000	USD
CY2021Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-4613000	USD
	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount	0	USD
CY2021Q3	onb	Financing Receivable Number Of Loan Portfolios FinancingReceivableNumberOfLoanPortfolios	4	portfolio
CY2021Q3	onb	Financing Receivable Number Of Loan Segments FinancingReceivableNumberOfLoanSegments	7	segment
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	13584828000	USD
CY2021Q3	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	47200000	USD
CY2020Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	57300000	USD
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	109444000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	1215000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	29255000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	27609000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	128394000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4169000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	7163000	USD
CY2020Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	0	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	131388000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	131388000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3765000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	7143000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-26898000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	107868000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	54619000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	14846000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	10773000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	39495000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	131388000	USD
	onb	Finance Receivable Past Due Period For Nonaccrual Status FinanceReceivablePastDuePeriodForNonaccrualStatus	P90D
	onb	Troubled Debt Restructuring Modified Term TroubledDebtRestructuringModifiedTerm	P6M
	onb	Loan Charge Off To Be Recorded Minimum Period LoanChargeOffToBeRecordedMinimumPeriod	P120D
CY2021Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	111586000	USD
CY2021Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	30373000	USD
CY2021Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	113000	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
CY2021Q3	onb	Loan Participations LoanParticipations	1124000000	USD
CY2021Q3	onb	Loan Participations Sold LoanParticipationsSold	529700000	USD
CY2021Q3	onb	Loan Participations Retained LoanParticipationsRetained	594300000	USD
	onb	Loan Charge Off To Be Recorded Maximum Period LoanChargeOffToBeRecordedMaximumPeriod	P180D
CY2021Q2	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	27795000	USD
CY2021Q3	onb	Financing Receivable Troubled Debt Restructuring Write Offs Recoveries Net FinancingReceivableTroubledDebtRestructuringWriteOffsRecoveriesNet	-56000	USD
CY2021Q3	onb	Financing Receivable Troubled Debt Restructuring Payments Disbursements FinancingReceivableTroubledDebtRestructuringPaymentsDisbursements	669000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	29432000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	32653000	USD
	onb	Financing Receivable Troubled Debt Restructuring Write Offs Recoveries Net FinancingReceivableTroubledDebtRestructuringWriteOffsRecoveriesNet	-79000	USD
CY2021Q3	onb	Financing Receivable Troubled Debt Restructuring Additions Removals Net FinancingReceivableTroubledDebtRestructuringAdditionsRemovalsNet	2073000	USD
	onb	Financing Receivable Troubled Debt Restructuring Payments Disbursements FinancingReceivableTroubledDebtRestructuringPaymentsDisbursements	4378000	USD
	onb	Financing Receivable Troubled Debt Restructuring Additions Removals Net FinancingReceivableTroubledDebtRestructuringAdditionsRemovalsNet	901000	USD
	onb	Financing Receivable Troubled Debt Restructuring Write Offs Recoveries Net FinancingReceivableTroubledDebtRestructuringWriteOffsRecoveriesNet	-1351000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	29255000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	31738000	USD
CY2020Q3	onb	Financing Receivable Troubled Debt Restructuring Write Offs Recoveries Net FinancingReceivableTroubledDebtRestructuringWriteOffsRecoveriesNet	-3259000	USD
CY2020Q3	onb	Financing Receivable Troubled Debt Restructuring Payments Disbursements FinancingReceivableTroubledDebtRestructuringPaymentsDisbursements	7343000	USD
CY2020Q3	onb	Financing Receivable Troubled Debt Restructuring Additions Removals Net FinancingReceivableTroubledDebtRestructuringAdditionsRemovalsNet	5907000	USD
	onb	Financing Receivable Troubled Debt Restructuring Payments Disbursements FinancingReceivableTroubledDebtRestructuringPaymentsDisbursements	9564000	USD
	onb	Financing Receivable Troubled Debt Restructuring Additions Removals Net FinancingReceivableTroubledDebtRestructuringAdditionsRemovalsNet	5907000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	29432000	USD
CY2021Q3	onb	Financing Receivable Troubled Debt Restructurings Included With Non Accrual Loan FinancingReceivableTroubledDebtRestructuringsIncludedWithNonAccrualLoan	12800000	USD
CY2020Q4	onb	Financing Receivable Troubled Debt Restructurings Included With Non Accrual Loan FinancingReceivableTroubledDebtRestructuringsIncludedWithNonAccrualLoan	14900000	USD
CY2021Q3	onb	Financing Receivable Troubled Debt Restructurings Specific Reserves FinancingReceivableTroubledDebtRestructuringsSpecificReserves	800000	USD
CY2020Q4	onb	Financing Receivable Troubled Debt Restructurings Specific Reserves FinancingReceivableTroubledDebtRestructuringsSpecificReserves	1600000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
CY2021Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
	onb	Financing Receivable Troubled Debt Restructuring Number Of Loans Qualified For Removal FinancingReceivableTroubledDebtRestructuringNumberOfLoansQualifiedForRemoval	1	loan
	onb	Loan To Be Considered As Payment Default In Period LoanToBeConsideredAsPaymentDefaultInPeriod	P90D
CY2021Q2	us-gaap	Other Real Estate OtherRealEstate	520000	USD
CY2020Q2	us-gaap	Other Real Estate OtherRealEstate	1786000	USD
CY2020Q4	us-gaap	Other Real Estate OtherRealEstate	1324000	USD
CY2019Q4	us-gaap	Other Real Estate OtherRealEstate	2169000	USD
CY2021Q3	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	1703000	USD
CY2020Q3	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	368000	USD
	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	1858000	USD
	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	572000	USD
CY2021Q3	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	280000	USD
CY2020Q3	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	843000	USD
	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	1154000	USD
	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	1267000	USD
CY2021Q3	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	0	USD
CY2020Q3	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	63000	USD
	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	85000	USD
	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	226000	USD
CY2021Q3	us-gaap	Other Real Estate OtherRealEstate	1943000	USD
CY2020Q3	us-gaap	Other Real Estate OtherRealEstate	1248000	USD
CY2021Q3	us-gaap	Other Real Estate OtherRealEstate	1943000	USD
CY2020Q3	us-gaap	Other Real Estate OtherRealEstate	1248000	USD
CY2021Q3	us-gaap	Foreclosed Assets ForeclosedAssets	100000	USD
CY2021Q3	us-gaap	Foreclosed Assets ForeclosedAssets	100000	USD
CY2020Q3	us-gaap	Foreclosed Assets ForeclosedAssets	200000	USD
CY2021Q3	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	23000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	800000	USD
CY2021Q3	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	2700000	USD
CY2020Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	2700000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	626102000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	601729000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	150066000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	137321000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	476036000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	464408000	USD
CY2021Q3	us-gaap	Depreciation Depreciation	6500000	USD
	us-gaap	Depreciation Depreciation	20600000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	6800000	USD
	us-gaap	Depreciation Depreciation	21800000	USD
CY2021Q3	us-gaap	Lease Cost LeaseCost	3554000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	4232000	USD
	us-gaap	Lease Cost LeaseCost	11005000	USD
	us-gaap	Lease Cost LeaseCost	20408000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	69912000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	76197000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	76771000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	86598000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	16004000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	11351000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	16688000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	11813000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y4M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y7M6D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y3M18D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0339
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0340
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0306
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0346
	us-gaap	Operating Lease Payments OperatingLeasePayments	10692000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	12194000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	323000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	267000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1492000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	569000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	3464000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	640000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	13002000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2641000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	9273000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2673000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	8219000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2683000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	8079000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2682000	USD
CY2021Q3	onb	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	49815000	USD
CY2021Q3	onb	Finance Lease Liability To Be Paid After Year Four FinanceLeaseLiabilityToBePaidAfterYearFour	7591000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	91852000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	18910000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	15081000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	2222000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	76771000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	16688000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	642000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	2047000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	1598000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	1420000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	1083000	USD
CY2021Q3	onb	Lessor Operating Lease Payment To Be Received After Year Four LessorOperatingLeasePaymentToBeReceivedAfterYearFour	2922000	USD
CY2021Q3	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	9712000	USD
CY2021Q2	us-gaap	Goodwill Goodwill	1036994000	USD
CY2020Q2	us-gaap	Goodwill Goodwill	1036994000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1036994000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1036994000	USD
CY2021Q3	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2020Q3	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2021Q3	us-gaap	Goodwill Goodwill	1036994000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	1036994000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	1036994000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	1036994000	USD
CY2021Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	109301000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	72050000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	37251000	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
	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8800000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3500000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10800000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	2573000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9014000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7053000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5645000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4509000	USD
CY2021Q3	onb	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	8457000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	37251000	USD
CY2021Q3	us-gaap	Servicing Asset ServicingAsset	29200000	USD
CY2020Q4	us-gaap	Servicing Asset ServicingAsset	26700000	USD
CY2021Q3	onb	Principal Balance Of Loans Serviced For Others PrincipalBalanceOfLoansServicedForOthers	3618000000	USD
CY2020Q4	onb	Principal Balance Of Loans Serviced For Others PrincipalBalanceOfLoansServicedForOthers	3613000000	USD
CY2021Q3	us-gaap	Escrow Deposit EscrowDeposit	43800000	USD
CY2020Q4	us-gaap	Escrow Deposit EscrowDeposit	16200000	USD
CY2021Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	28886000	USD
CY2020Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	26288000	USD
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	28124000	USD
CY2019Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	25399000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	2671000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	4446000	USD
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	8842000	USD
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	9849000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	2236000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	2885000	USD
	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	7645000	USD
	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	7399000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	29321000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	27849000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	29321000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	27849000	USD
CY2021Q2	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	105000	USD
CY2020Q2	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	2253000	USD
CY2020Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	1407000	USD
CY2019Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	31000	USD
CY2021Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-5000	USD
CY2020Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	95000	USD
	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-1307000	USD
	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	2317000	USD
CY2021Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	100000	USD
CY2020Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	2348000	USD
CY2021Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	100000	USD
CY2020Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	2348000	USD
CY2021Q3	us-gaap	Servicing Asset ServicingAsset	29221000	USD
CY2020Q3	us-gaap	Servicing Asset ServicingAsset	25501000	USD
CY2021Q3	us-gaap	Servicing Asset ServicingAsset	29221000	USD
CY2020Q3	us-gaap	Servicing Asset ServicingAsset	25501000	USD
CY2021Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	31900000	USD
	onb	Fair Value Inputs Discount Rate1 FairValueInputsDiscountRate1	0.09
CY2021Q3	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
CY2021Q3	onb	Investments In Qualified Affordable Housing Projects InvestmentsInQualifiedAffordableHousingProjects	74290000	USD
CY2021Q3	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	31133000	USD
CY2020Q4	onb	Investments In Qualified Affordable Housing Projects InvestmentsInQualifiedAffordableHousingProjects	62000000	USD
CY2020Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	30105000	USD
CY2021Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	2599000	USD
CY2021Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	2650000	USD
CY2020Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	3891000	USD
CY2020Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	4756000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	7339000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	7665000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	11246000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	10214000	USD
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	375247000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	431166000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	399141000	USD
	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	396495000	USD
	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	355039000	USD
	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	405278000	USD
	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	399141000	USD
	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0010
	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0027
CY2021Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0010
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0012
CY2020Q3	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0012
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	375247000	USD
	onb	Percentage Pledged Securities Of Repurchase Agreements Outstanding Balance PercentagePledgedSecuritiesOfRepurchaseAgreementsOutstandingBalance	1.20
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	1904155000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	1999160000	USD
CY2021Q3	onb	Advances From Federal Home Loan Banks Fair Value Hedge Basis Adjustments And Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksFairValueHedgeBasisAdjustmentsAndUnamortizedPrepaymentFees	14101000	USD
CY2020Q4	onb	Advances From Federal Home Loan Banks Fair Value Hedge Basis Adjustments And Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksFairValueHedgeBasisAdjustmentsAndUnamortizedPrepaymentFees	7725000	USD
CY2021Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1890054000	USD
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1991435000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Activity For Year Average Interest Rate At Period End FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd	0.0130
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	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
CY2021Q3	onb	Advances From Federal Home Loan Banks Modifications Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksModificationsUnamortizedPrepaymentFees	27700000	USD
CY2020Q4	onb	Advances From Federal Home Loan Banks Modifications Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksModificationsUnamortizedPrepaymentFees	30000000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Remainder Of Fiscal Year FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRemainderOfFiscalYear	0	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	29000000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	155000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	25000000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	550000000	USD
CY2021Q3	onb	Federal Home Loan Bank Advance Maturity After Year Four FederalHomeLoanBankAdvanceMaturityAfterYearFour	1300000000	USD
CY2021Q3	onb	Advances From Federal Home Loan Banks Fair Value Hedge Basis Adjustments And Unamortized Prepayment Fees AdvancesFromFederalHomeLoanBanksFairValueHedgeBasisAdjustmentsAndUnamortizedPrepaymentFees	14101000	USD
CY2021Q3	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1890054000	USD
CY2021Q3	us-gaap	Other Borrowings OtherBorrowings	270968000	USD
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	252787000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	533000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	2242000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	2319000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	177377000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	2426000	USD
CY2021Q3	onb	Long Term Debt Maturity After Year Four LongTermDebtMaturityAfterYearFour	86446000	USD
CY2021Q3	onb	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net And Other Basis Adjustments DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNetAndOtherBasisAdjustments	375000	USD
CY2021Q3	us-gaap	Other Borrowings OtherBorrowings	270968000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-3354000	USD
CY2021Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2098000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	5226000	USD
CY2020Q3	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	4985000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-85433000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	5528000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	104028000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	10951000	USD
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2300000	shares
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2021Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	18779000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	18920000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56830000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	37200000	USD
CY2021Q3	onb	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	2786000	USD
CY2020Q3	onb	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	2682000	USD
	onb	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	8327000	USD
	onb	Income Tax Reconciliation Tax Exempt Interest IncomeTaxReconciliationTaxExemptInterest	7985000	USD
CY2021Q3	onb	Income Tax Reconciliation Non Deductible Expense Interest Disallowance IncomeTaxReconciliationNonDeductibleExpenseInterestDisallowance	28000	USD
CY2020Q3	onb	Income Tax Reconciliation Non Deductible Expense Interest Disallowance IncomeTaxReconciliationNonDeductibleExpenseInterestDisallowance	36000	USD
	onb	Income Tax Reconciliation Non Deductible Expense Interest Disallowance IncomeTaxReconciliationNonDeductibleExpenseInterestDisallowance	92000	USD
	onb	Income Tax Reconciliation Non Deductible Expense Interest Disallowance IncomeTaxReconciliationNonDeductibleExpenseInterestDisallowance	153000	USD
CY2021Q3	onb	Effective Income Tax Rate Reconciliation Tax Exempt Income Life Insurance Amount EffectiveIncomeTaxRateReconciliationTaxExemptIncomeLifeInsuranceAmount	483000	USD
CY2020Q3	onb	Effective Income Tax Rate Reconciliation Tax Exempt Income Life Insurance Amount EffectiveIncomeTaxRateReconciliationTaxExemptIncomeLifeInsuranceAmount	386000	USD
	onb	Effective Income Tax Rate Reconciliation Tax Exempt Income Life Insurance Amount EffectiveIncomeTaxRateReconciliationTaxExemptIncomeLifeInsuranceAmount	1582000	USD
	onb	Effective Income Tax Rate Reconciliation Tax Exempt Income Life Insurance Amount EffectiveIncomeTaxRateReconciliationTaxExemptIncomeLifeInsuranceAmount	1657000	USD
CY2021Q3	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3241000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3032000	USD
	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	9817000	USD
	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	9489000	USD
CY2021Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2282000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	656000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7455000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2367000	USD
CY2021Q3	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	1077000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-2501000	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-1360000	USD
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	840000	USD
CY2021Q3	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	315000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2575000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2838000	USD
	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	6296000	USD
CY2021Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-902000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	686000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	232000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17680000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12154000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49270000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24854000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.198
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.135
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.182
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.140
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	28791000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	34971000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	15579000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	20076000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	14823000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	18982000	USD
CY2021Q3	onb	Deferred Tax Assets Deferred Gain On Securities DeferredTaxAssetsDeferredGainOnSecurities	1334000	USD
CY2020Q4	onb	Deferred Tax Assets Deferred Gain On Securities DeferredTaxAssetsDeferredGainOnSecurities	2102000	USD
CY2021Q3	onb	Deferred Tax Assets Acquired Loan DeferredTaxAssetsAcquiredLoan	8949000	USD
CY2020Q4	onb	Deferred Tax Assets Acquired Loan DeferredTaxAssetsAcquiredLoan	11989000	USD
CY2021Q3	onb	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	22959000	USD
CY2020Q4	onb	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	24245000	USD
CY2021Q3	onb	Deferred Tax Assets Investments And Other Partnerships DeferredTaxAssetsInvestmentsAndOtherPartnerships	494000	USD
CY2020Q4	onb	Deferred Tax Assets Investments And Other Partnerships DeferredTaxAssetsInvestmentsAndOtherPartnerships	1054000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	942000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	488000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	93871000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	113907000	USD
CY2021Q3	onb	Deferred Tax Liabilities Purchase Accounting DeferredTaxLiabilitiesPurchaseAccounting	18524000	USD
CY2020Q4	onb	Deferred Tax Liabilities Purchase Accounting DeferredTaxLiabilitiesPurchaseAccounting	18232000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	7179000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	6582000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	14550000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	14008000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	953000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	955000	USD
CY2021Q3	onb	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	21106000	USD
CY2020Q4	onb	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	21569000	USD
CY2021Q3	onb	Deferred Tax Liabilities Unrealized Gains On Available For Sale Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleInvestmentSecurities	14590000	USD
CY2020Q4	onb	Deferred Tax Liabilities Unrealized Gains On Available For Sale Investment Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleInvestmentSecurities	40756000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	628000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	1080000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1561000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1555000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	79091000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	104737000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	14780000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	9170000	USD
CY2021Q3	us-gaap	Bad Debt Reserve For Tax Purposes Of Qualified Lender BadDebtReserveForTaxPurposesOfQualifiedLender	52800000	USD
CY2021Q3	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Bad Debt Reserve For Tax Purposes Of Qualified Lender DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender	13000000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2021Q3	onb	Percentage Of Periodic Changes In Fair Value Qualifies For Hedge Accounting PercentageOfPeriodicChangesInFairValueQualifiesForHedgeAccounting	1
CY2021Q3	onb	Loan Commitments LoanCommitments	4241000000	USD
CY2021Q3	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	65800000	USD
	us-gaap	Loans And Leases Receivable Commitments Fixed Rates LoansAndLeasesReceivableCommitmentsFixedRates	3900000000	USD
	us-gaap	Loans And Leases Receivable Commitments Variable Rates LoansAndLeasesReceivableCommitmentsVariableRates	341300000	USD
	onb	Loan Commitments Floating Interest Rate Minimum LoanCommitmentsFloatingInterestRateMinimum	0
	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
CY2021Q3	onb	Allowance For Unfunded Loan Commitments AllowanceForUnfundedLoanCommitments	10300000	USD
CY2020Q4	onb	Allowance For Unfunded Loan Commitments AllowanceForUnfundedLoanCommitments	11700000	USD
CY2021Q3	onb	Credit Extended CreditExtended	7800000	USD
CY2020Q4	onb	Credit Extended CreditExtended	7900000	USD
CY2021Q3	onb	Credit Extensions With Collateral CreditExtensionsWithCollateral	7400000	USD
CY2020Q4	onb	Credit Extensions With Collateral CreditExtensionsWithCollateral	7500000	USD
	onb	Term Of Standby Letters Of Credit TermOfStandbyLettersOfCredit	P1Y
CY2021Q3	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	65800000	USD
CY2021Q3	onb	Carrying Value Of Letter Of Credit CarryingValueOfLetterOfCredit	400000	USD
CY2020Q4	onb	Notional Amount Of Standby Letters Of Credit NotionalAmountOfStandbyLettersOfCredit	86900000	USD
CY2020Q4	onb	Carrying Value Of Letter Of Credit CarryingValueOfLetterOfCredit	500000	USD
CY2021Q3	onb	Other Real Estate Owned Property Write Down OtherRealEstateOwnedPropertyWriteDown	0	USD
CY2020Q3	onb	Other Real Estate Owned Property Write Down OtherRealEstateOwnedPropertyWriteDown	63000	USD
	onb	Other Real Estate Owned Property Write Down OtherRealEstateOwnedPropertyWriteDown	23000	USD
	onb	Other Real Estate Owned Property Write Down OtherRealEstateOwnedPropertyWriteDown	161000	USD
CY2021Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	100000	USD
CY2021Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-5000	USD
	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	-1300000	USD
CY2020Q3	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	100000	USD
	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries	2300000	USD
CY2020Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	1400000	USD
	onb	Past Due Period Of Mortgage Loans Held For Sale PastDuePeriodOfMortgageLoansHeldForSale	P90D
CY2021Q3	us-gaap	Interest And Fee Income Loans Commercial And Residential Real Estate InterestAndFeeIncomeLoansCommercialAndResidentialRealEstate	400000	USD
	us-gaap	Interest And Fee Income Loans Commercial And Residential Real Estate InterestAndFeeIncomeLoansCommercialAndResidentialRealEstate	1100000	USD
CY2020Q3	us-gaap	Interest And Fee Income Loans Commercial And Residential Real Estate InterestAndFeeIncomeLoansCommercialAndResidentialRealEstate	600000	USD
	us-gaap	Interest And Fee Income Loans Commercial And Residential Real Estate InterestAndFeeIncomeLoansCommercialAndResidentialRealEstate	1500000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	31785000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	29960000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	94127000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	88795000	USD

Files In Submission

Name	View Source	Status
0000707179-21-000084-index-headers.html	Edgar Link	pending
0000707179-21-000084-index.html	Edgar Link	pending
0000707179-21-000084.txt	Edgar Link	pending
0000707179-21-000084-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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onb-20210930.htm	Edgar Link	pending
onb-20210930.xsd	Edgar Link	pending
onb-20210930_cal.xml	Edgar Link	unprocessable
onb-20210930_def.xml	Edgar Link	unprocessable
onb-20210930_htm.xml	Edgar Link	completed
onb-20210930_lab.xml	Edgar Link	unprocessable
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$ONB
Old National Bancorp Stock $onb

2021 Q3 Form 10-Q Financial Statement

#000070717921000084 Filed on October 27, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ONB Old National Bancorp Stock $onb

2021 Q3 Form 10-Q Financial Statement

#000070717921000084 Filed on October 27, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ONB
Old National Bancorp Stock $onb