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Financing Activities - Other Borrowings (Parenthetical) (Detail)
6 Months Ended
Jun. 30, 2015
Aug. 31, 2014
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Fixed rates   4.125%
Maturity date Aug. 15, 2024  
Senior Unsecured Notes [Member] | Old National Bancorp [Member]    
Debt Instrument [Line Items]    
Fixed rates 4.125%  
Maturity date Aug. 15, 2024  
Junior Subordinated Debt [Member] | Trust Preferred Securities [Member] | Old National Bancorp [Member]    
Debt Instrument [Line Items]    
Maturity, Start date Mar. 01, 2035  
Maturity, End date Jun. 01, 2037  
Repurchase Agreements / Sweeps [Member] | Old National Bank [Member]    
Debt Instrument [Line Items]    
Maturity, Start date Jan. 01, 2017  
Maturity, End date Jan. 01, 2018  
Federal Home Loan Bank Advances [Member] | Old National Bank [Member]    
Debt Instrument [Line Items]    
Maturity, Start date Jul. 01, 2015  
Maturity, End date Jan. 01, 2025  
Minimum [Member] | Junior Subordinated Debt [Member] | Old National Bancorp [Member]    
Debt Instrument [Line Items]    
Variable rates 1.63%  
Minimum [Member] | Repurchase Agreements / Sweeps [Member] | Old National Bank [Member]    
Debt Instrument [Line Items]    
Fixed rates 2.47%  
Minimum [Member] | Federal Home Loan Bank Advances [Member] | Old National Bank [Member]    
Debt Instrument [Line Items]    
Fixed rates 0.18%  
Variable rates 0.35%  
Maximum [Member] | Junior Subordinated Debt [Member] | Old National Bancorp [Member]    
Debt Instrument [Line Items]    
Variable rates 2.03%  
Maximum [Member] | Repurchase Agreements / Sweeps [Member] | Old National Bank [Member]    
Debt Instrument [Line Items]    
Fixed rates 2.50%  
Maximum [Member] | Federal Home Loan Bank Advances [Member] | Old National Bank [Member]    
Debt Instrument [Line Items]    
Fixed rates 6.76%  
Variable rates 0.43%