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Loans and Allowance for Credit Losses - Schedule of Composition of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification $ 6,652,539us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 6,318,201us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 5,072,281us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Allowance for loan losses (46,675)onb_LoansAndLeasesReceivableAllowanceNonCovered (44,297)onb_LoansAndLeasesReceivableAllowanceNonCovered (41,539)onb_LoansAndLeasesReceivableAllowanceNonCovered
Allowance for loan losses - covered loans (2,203)us-gaap_LoansAndLeasesReceivableAllowanceCovered (3,552)us-gaap_LoansAndLeasesReceivableAllowanceCovered (6,014)us-gaap_LoansAndLeasesReceivableAllowanceCovered
Net loans 6,603,661us-gaap_LoansAndLeasesReceivableNetReportedAmount 6,270,352us-gaap_LoansAndLeasesReceivableNetReportedAmount 5,024,728us-gaap_LoansAndLeasesReceivableNetReportedAmount
Commercial Loan Including Finance Lease [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,668,275us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_CommercialLoanIncludingFinanceLeaseMember
1,629,600us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_CommercialLoanIncludingFinanceLeaseMember
 
Commercial Real Estate - Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 150,711us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
134,552us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
 
Commercial Real Estate - Other [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,662,868us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
1,576,558us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
 
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 1,625,354us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
1,519,156us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
 
Consumer Credit - Heloc [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 374,079us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_ConsumerCreditHelocMember
360,320us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_ConsumerCreditHelocMember
 
Consumer Credit - Auto [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 897,190us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
846,969us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
 
Consumer Credit - Other [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification 137,222us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_ConsumerCreditOtherMember
103,338us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_ConsumerCreditOtherMember
 
Covered Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans by lending classification $ 136,840us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_CoveredLoansMember
$ 147,708us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= onb_CoveredLoansMember