Parent Company Financial Statements (Schedule Of Condensed Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Net income	$ 98,361	$ 101,891	$ 74,496
Depreciation, amortization and accretion	18,267	16,040	13,151
Change in fair value of junior subordinated debentures	2,193	2,175	2,217
Net (increase) decrease in other assets	32,129	5,401	(15,404)
Net (decrease) increase in other liabilities	(7,589)	22,255	15,177
Net cash provided by operating activities	413,097	26,485	182,352
Net cash used by investing activities	281,072	121,519	(382,744)
Dividends paid on common stock	(50,768)	(46,201)	(25,317)
Stock repurchased	(9,360)	(7,436)	(29,754)
Proceeds from exercise of stock options	6,398	981	308
Net cash used by financing activities	(447,533)	(202,983)	(204,967)
Change in cash and cash equivalents	246,636	(54,979)	(405,359)
Cash and cash equivalents, beginning of year	543,787	598,766	1,004,125
Cash and cash equivalents, end of year	790,423	543,787	598,766
Umpqua Bank [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	98,361	101,891	74,496
Equity in undistributed earnings of subsidiaries	(43,381)	(30,054)	(64,096)
Depreciation, amortization and accretion	(322)	(322)	(322)
Change in fair value of junior subordinated debentures	2,193	2,182	2,217
Net (increase) decrease in other assets	(92)	4,925	(3,933)
Net (decrease) increase in other liabilities	(1,361)	(1,184)	3,736
Net cash provided by operating activities	55,398	77,438	12,098
Investment in subsidiaries	(2,928)	(24,970)	(3,668)
Acquisitions	0	419	0
Net decrease in receivables from nonbank subsidiaries	0	0	8
Net cash used by investing activities	(2,928)	(24,551)	(3,660)
Net (decrease) increase in payables to subsidiaries	(8,448)	17	7
Dividends paid on common stock	(50,767)	(46,201)	(25,317)
Stock repurchased	(9,356)	(7,433)	(29,754)
Proceeds from exercise of stock options	6,397	980	309
Net cash used by financing activities	(62,174)	(52,637)	(54,755)
Change in cash and cash equivalents	(9,704)	250	(46,317)
Cash and cash equivalents, beginning of year	82,383	82,133	128,450
Cash and cash equivalents, end of year	$ 72,679	$ 82,383	$ 82,133