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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 26, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-15950    
Entity Registrant Name FIRST BUSEY CORPORATION    
Entity Incorporation, State or Country Code NV    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 1,950
Entity Common Stock, Shares Outstanding   86,227,449  
Documents Incorporated by Reference
Portions of the definitive Proxy Statement for the 2026 Annual Meeting of Stockholders of First Busey Corporation to be held May 20, 2026, are incorporated by reference in this Form 10-K in response to Part III.
    
Entity Central Index Key 0000314489    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
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