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Other Borrowings - Other Borrowings (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Aug. 31, 2014
Debt Instrument [Line Items]        
Other borrowings $ 251,662 $ 248,782 $ 219,314  
Old National Bank [Member]        
Debt Instrument [Line Items]        
Capital lease obligations 5,294 5,389    
Other 3,150 694    
Old National Bancorp [Member]        
Debt Instrument [Line Items]        
Other basis adjustments (3,182) (3,585)    
5.75% Fixed Rate Subordinated Debentures [Member] | Old National Bank [Member]        
Debt Instrument [Line Items]        
Subordinated debentures (fixed rate 5.75%) 12,000 12,000    
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes (fixed rate 4.125%) maturing August 2024       $ 175,000
Senior Unsecured Notes [Member] | Old National Bancorp [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes (fixed rate 4.125%) maturing August 2024 175,000 175,000    
Unamortized debt issuance costs related to senior unsecured notes (910) (1,026)    
Junior Subordinated Debt [Member] | Old National Bancorp [Member]        
Debt Instrument [Line Items]        
Junior subordinated debentures (variable rates of 3.74% to 6.22%) maturing April 2032 to June 2037 $ 60,310 $ 60,310