Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 05, 2020
Document Information [Line Items]
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
Entity Registrant Name	BankUnited, Inc.
Entity Central Index Key	0001504008
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Entity File Number	001-35039
Document Fiscal Period Focus	Q2
Document Annual Report	true
Amendment Flag	false
Entity Common Stock Shares Outstanding		92,401,950
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Document Transition Report	false
Entity Shell Company	false
Entity Shell Company	DE
Entity Tax Identification Number	27-0162450
City Area Code	305
Local Phone Number	569-2000
Entity Small Business	false
Entity Emerging Growth Company	false
NEW YORK STOCK EXCHANGE, INC. [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	BKU
Security Exchange Name	NYSE