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Cover
Sep. 24, 2025
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Sep. 24, 2025
Entity Registrant Name First Busey Corporation
Entity Incorporation, State or Country Code NV
Entity File Number 0-15950
Entity Tax Identification Number 37-1078406
Entity Address, Address Line One 11440 Tomahawk Creek Parkway
Entity Address, City or Town Leawood
Entity Address, State or Province KS
Entity Address, Postal Zip Code 66211
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
Amendment Flag false
Entity Central Index Key 0000314489
Common Stock, $0.001 par value  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol BUSE
Security Exchange Name NASDAQ
Depositary Shares, each representing a 1/40th interest in a share of 8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock, $0.001 par value  
Document Information [Line Items]  
Title of 12(b) Security Depositary Shares, each representing a 1/40th interest in a share of 8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock
Trading Symbol BUSEP
Security Exchange Name NASDAQ