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Document And Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 001-34624  
Entity Registrant Name Umpqua Holdings Corporation  
Entity Incorporation, State or Country Code OR  
Entity Tax Identification Number 93-1261319   
Entity Address, Address Line One One SW Columbia Street  
Entity Address, Address Line Two Suite 1200  
Entity Address, City or Town Portland  
Entity Address, State or Province OR  
Entity Address, Postal Zip Code 97258  
City Area Code 503  
Local Phone Number 727-4100  
Title of 12(b) Security Common Stock  
Trading Symbol UMPQ  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   220,199,367
Entity Central Index Key 0001077771  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false