XML 114 R103.htm IDEA: XBRL DOCUMENT v3.10.0.1
Other Borrowings - Other Borrowings (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2018
Aug. 31, 2014
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Fixed rates   4.125%
Maturity Date Aug. 15, 2024  
Old National Bank [Member] | 5.75% Fixed Rate Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Fixed rates 5.75%  
Old National Bancorp [Member] | Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Fixed rates 4.125%  
Maturity Date Aug. 15, 2024  
Old National Bancorp [Member] | Trust Preferred Securities [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Maturity, Start date Apr. 22, 2032  
Maturity, End date Jun. 15, 2037  
Old National Bancorp [Member] | Trust Preferred Securities [Member] | Junior Subordinated Debt [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Variable rates 3.74%  
Old National Bancorp [Member] | Trust Preferred Securities [Member] | Junior Subordinated Debt [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Variable rates 6.22%