Parent Company Financial Statements (Schedule Of Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Other income (loss)	$ (63,681)	$ (40,495)	$ (48,306)
Other expenses	45,404	45,956	55,631
Income tax benefit	137,860	67,000	114,808
Net income	420,300	(1,523,420)	354,095
Umpqua Holdings Corporation
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries	407,371	213,464	219,143
Other income (loss)	5,007	11	(18)
Total income	412,378	213,475	219,125
Management fees paid to subsidiaries	1,590	1,165	1,144
Other expenses	17,834	17,894	25,311
Total expenses	19,424	19,059	26,455
Income before income tax benefit and equity in undistributed earnings of subsidiaries	392,954	194,416	192,670
Income tax benefit	(3,470)	(4,245)	(5,742)
Net income before equity in undistributed earnings of subsidiaries	396,424	198,661	198,412
Equity in undistributed earnings (losses) of subsidiaries	23,876	(1,722,081)	155,683
Net income	$ 420,300	$ (1,523,420)	$ 354,095