v3.10.0.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Feb. 25, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
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-K    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus Q4    
Amendment Flag false    
Entity Common Stock Shares Outstanding   98,591,661  
Entity Public Float     $ 4,287,268,982
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No