Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 17, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K
Document Transition Report	false
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
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		74,736,586
Entity Central Index Key	0001504008
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Voluntary Filers	No
Document Annual Report	true
Entity Well-known Seasoned Issuer	Yes
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 2,742,608,124
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