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Cover Page - shares
 6 Months Ended
Jun. 30, 2025
Aug. 04, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Transition Report false  
Document Period End Date Jun. 30, 2025  
Entity File Number 001-35039  
Entity Registrant Name BankUnited, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-0162450  
Entity Address, Address Line One 14817 Oak Lane  
Entity Address, City or Town Miami Lakes  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33016  
City Area Code 305  
Local Phone Number 569-2000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Shell Company false  
Entity Common Stock Shares Outstanding   75,212,773
Entity Central Index Key 0001504008  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Document Quarterly Report true  
Current Fiscal Year End Date --12-31  
NEW YORK STOCK EXCHANGE, INC.    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, $0.01 Par Value  
Trading Symbol BKU  
Security Exchange Name NYSE