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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 000-24939    
Entity Registrant Name EAST WEST BANCORP, INC.    
Entity Central Index Key 0001069157    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-4703316    
Entity Address, Address Line One 135 North Los Robles Ave.    
Entity Address, Address Line Two 7th Floor    
Entity Address, City or Town Pasadena    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91101    
City Area Code 626    
Local Phone Number 768-6000    
Title of 12(b) Security Common Stock, $0.001 Par Value    
Trading Symbol EWBC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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 Public Float     $ 6,765,665,370
Entity Common Stock, Shares Outstanding   145,625,565  
Documents Incorporated by Reference
 Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A relating to its 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.