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Other Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Nov. 01, 2017
Aug. 31, 2014
Debt Instrument [Line Items]          
Lease liability $ 7,284   $ 7,406    
Old National Bank          
Debt Instrument [Line Items]          
Lease liability 7,284   7,406    
Junior Subordinated Debentures | Trust Preferred Securities          
Debt Instrument [Line Items]          
Redemption of debentures $ 3,100 $ 4,100      
Debt instrument floating rate at redemption 4.71% 5.36%      
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-to-Floating Notes          
Debt Instrument [Line Items]          
Value of subordinated fixed-to-floating notes assumed       $ 12,000  
LIBOR rate       4.356%  
Old National Bancorp | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Senior unsecured notes $ 175,000   $ 175,000   $ 175,000
Fixed rates 4.125%       4.125%