Parent Company Financial Statements (Schedule Of Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]
Other income (loss)	$ 30,528	$ (1,008)	$ 63,681
Other expenses	73,468	51,566	45,404
Income tax benefit	122,484	113,826	137,860
Net Income (Loss)	348,715	336,752	420,300
Umpqua Holdings Corporation
Condensed Financial Statements, Captions [Line Items]
Dividends from bank subsidiary	353,000	192,000	398,000
Dividends from non-bank subsidiaries	10,115	2,104	9,371
Other income (loss)	453	127	5,007
Total income	363,568	194,231	412,378
Management fees paid to subsidiaries	1,877	1,434	1,590
Other expenses	44,493	22,396	17,834
Total expenses	46,370	23,830	19,424
Income before income tax benefit and equity in undistributed earnings of subsidiaries	317,198	170,401	392,954
Income tax benefit	(10,019)	(4,677)	(3,470)
Net income before equity in undistributed earnings of subsidiaries	327,217	175,078	396,424
Equity in undistributed earnings losses of subsidiaries	21,498	161,674	23,876
Net Income (Loss)	$ 348,715	$ 336,752	$ 420,300