Cover
| Cover | Oct. 21, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 21, 2020 |
| Entity Registrant Name | Umpqua Holdings Corporation |
| Entity Incorporation, State or Country Code | OR |
| Entity File Number | 001-34624 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(g) Security | Common Stock |
| Trading Symbol | UMPQ |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001077771 |
| Amendment Flag | false |