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Financing Activities - Other Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Aug. 31, 2014
Debt Instrument [Line Items]        
ASC 815 fair value hedge and other basis adjustments $ (3,377)onb_Asc815FairValueHedgeAndOtherBasisAdjustments      
Total other borrowings 870,580us-gaap_LongTermDebtAndCapitalLeaseObligations 920,102us-gaap_LongTermDebtAndCapitalLeaseObligations 506,782us-gaap_LongTermDebtAndCapitalLeaseObligations  
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024       175,000us-gaap_UnsecuredLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Old National Bancorp [Member]        
Debt Instrument [Line Items]        
ASC 815 fair value hedge and other basis adjustments (4,776)onb_Asc815FairValueHedgeAndOtherBasisAdjustments
/ dei_LegalEntityAxis
= onb_OldNationalBancorpMember
(4,884)onb_Asc815FairValueHedgeAndOtherBasisAdjustments
/ dei_LegalEntityAxis
= onb_OldNationalBancorpMember
   
Old National Bancorp [Member] | Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024 175,000us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= onb_OldNationalBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
175,000us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= onb_OldNationalBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Old National Bancorp [Member] | Junior Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Junior subordinated debentures (variable rates of 1.61% to 2.02%) maturing March 2035 to June 2037 45,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= onb_OldNationalBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
45,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= onb_OldNationalBancorpMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Old National Bank [Member]        
Debt Instrument [Line Items]        
Securities sold under agreements to repurchase (fixed rates 2.47% to 2.50%) maturing January 2017 to January 2018 50,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
50,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
   
Federal Home Loan Bank advances (fixed rates 0.29% to 6.76% and variable rates 0.39% to 0.41%) maturing May 2015 to January 2025 599,874us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
649,987us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
   
Capital lease obligation 4,083us-gaap_CapitalLeaseObligations
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
4,099us-gaap_CapitalLeaseObligations
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
   
ASC 815 fair value hedge and other basis adjustments $ 1,399onb_Asc815FairValueHedgeAndOtherBasisAdjustments
/ dei_LegalEntityAxis
= onb_OldNationalBankMember
$ 900onb_Asc815FairValueHedgeAndOtherBasisAdjustments
/ dei_LegalEntityAxis
= onb_OldNationalBankMember