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Other Borrowings - Other Borrowings (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2014
Debt Instrument [Line Items]      
Total other borrowings $ 248,782 $ 218,939  
Old National Bancorp [Member]      
Debt Instrument [Line Items]      
Other basis adjustments (3,585) (3,971)  
Total other borrowings 230,699 214,847  
Old National Bank [Member]      
Debt Instrument [Line Items]      
Capital lease obligations 5,389 4,092  
Premium on subordinated debentures 694    
Senior Unsecured Notes [Member]      
Debt Instrument [Line Items]      
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024     $ 175,000
Senior Unsecured Notes [Member] | Old National Bancorp [Member]      
Debt Instrument [Line Items]      
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024 175,000 175,000  
Unamortized debt issuance costs related to Senior unsecured bank notes (1,026) (1,182)  
Junior Subordinated Debt [Member] | Old National Bancorp [Member]      
Debt Instrument [Line Items]      
Junior subordinated debentures (variable rates of 2.89% to 5.06%) maturing April 2032 to September 2037 60,310 $ 45,000  
5.75% Fixed Rate Subordinated Debentures [Member] | Old National Bank [Member]      
Debt Instrument [Line Items]      
Subordinated debentures (fixed rate 5.75%) $ 12,000