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Other Borrowings - Other Borrowings (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Aug. 31, 2014
Debt Instrument [Line Items]        
Total other borrowings $ 219,021 $ 218,939 $ 218,393  
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured bank notes (fixed rate 4.125%) maturing August 2024       $ 175,000
Old National Bancorp [Member]        
Debt Instrument [Line Items]        
Other basis adjustments (3,849) (3,971)    
Old National Bancorp [Member] | Senior Unsecured Notes [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 (1,143) (1,182)    
Old National Bancorp [Member] | Junior Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Junior subordinated debentures (variable rates of 2.49% to 2.90%) maturing March 2035 to September 2037 45,000 45,000    
Old National Bank [Member]        
Debt Instrument [Line Items]        
Capital lease obligation $ 4,013 $ 4,092