XML 111 R100.htm IDEA: XBRL DOCUMENT v3.20.2
Other Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Nov. 01, 2017
Apr. 30, 2020
Mar. 31, 2020
Feb. 29, 2020
Jun. 30, 2020
Dec. 31, 2019
Aug. 31, 2014
Debt Instrument [Line Items]              
Lease liability         $ 12,310 $ 7,406  
Old National Bank              
Debt Instrument [Line Items]              
Lease liability         12,310 7,406  
Junior Subordinated Debentures | Trust Preferred Securities              
Debt Instrument [Line Items]              
Redemption of debentures   $ 3,100 $ 3,100 $ 4,100      
Debt instrument floating rate at redemption   5.62% 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            
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-to-Floating Notes | LIBOR              
Debt Instrument [Line Items]              
Variable 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%