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Other Borrowings - Other Borrowings (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2016
Aug. 31, 2014
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Fixed rates   4.125%
Maturity date Aug. 15, 2024  
Old National Bancorp [Member] | Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Fixed rates 4.125%  
Maturity date Aug. 15, 2024  
Trust Preferred Securities [Member] | Old National Bancorp [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Maturity, Start date Mar. 31, 2035  
Maturity, End date Sep. 30, 2037  
Trust Preferred Securities [Member] | Minimum [Member] | Old National Bancorp [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Variable rates 2.30%  
Trust Preferred Securities [Member] | Maximum [Member] | Old National Bancorp [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Variable rates 2.74%