Parent Company Financial Statements (Schedule Of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Other assets	$ 542,442	$ 669,029
Total assets	30,640,936	29,235,175	$ 28,846,809
Other liabilities	317,503	299,012
Junior subordinated debentures, at fair value	293,081	255,217
Junior subordinated debentures, at amortized cost	88,041	88,268
Total liabilities	27,891,666	26,530,598
Shareholders' equity	2,749,270	2,704,577
Total liabilities and shareholders' equity	30,640,936	29,235,175
Umpqua Holdings Corporation
Condensed Financial Statements, Captions [Line Items]
Non-interest bearing deposits with subsidiary bank	276,572	136,745
Investments in Bank subsidiary	2,860,132	2,913,649
Investments in Nonbank subsidiaries	16,660	30,266
Other assets	1,847	523
Total assets	3,155,211	3,081,183
Payable to subsidiary bank	507	98
Other liabilities	24,312	33,023
Junior subordinated debentures, at fair value	293,081	255,217
Junior subordinated debentures, at amortized cost	88,041	88,268
Total liabilities	405,941	376,606
Shareholders' equity	2,749,270	2,704,577
Total liabilities and shareholders' equity	$ 3,155,211	$ 3,081,183