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Cover
Apr. 29, 2021
Jan. 28, 2021
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Apr. 29, 2021  
Entity Incorporation, State or Country Code IN  
Entity File Number 001-15817  
Entity Tax Identification Number 35-1539838  
Entity Address, Address Line One One Main Street  
Entity Address, City or Town Evansville,  
Entity Address, State or Province IN  
Entity Address, Postal Zip Code 47708  
City Area Code   800
Local Phone Number   731-2265
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Common Stock, No Par Value  
Trading Symbol ONB  
Security Exchange Name NASDAQ  
Entity Emerging Growth Company false  
Entity Central Index Key 0000707179  
Amendment Flag false  
Entity Registrant Name OLD NATIONAL BANCORP