XML 12 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2020
Nov. 05, 2020
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2020  
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 100 W. University Ave.  
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  
Title of 12(b) Security Common Stock, $.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   54,522,231
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0000314489  
Amendment Flag false