Document and Entity Information
Jul. 13, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 13, 2020
Entity Registrant Name First Busey Corporation
Entity Incorporation, State or Country Code NV
Entity File Number 000-15950
Entity Tax Identification Number 37-1078406
Entity Address, Address Line One 100 W. University Avenue
Entity Address, City or Town Champaign
Entity Address, State or Province IL
Entity Address, Postal Zip Code 61820
City Area Code 217
Local Phone Number 365-4544
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000314489
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol BUSE
Security Exchange Name NASDAQ