Cover Page - shares	3 Months Ended
	Mar. 31, 2025	May 08, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2025
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
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	BUSE
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		89,490,547
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000314489
Amendment Flag	false
Former Address
Document Information [Line Items]
Entity Address, Address Line One	100 West University Avenue
Entity Address, City or Town	Champaign
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	61820