Parent Company Financial Statements (Schedule Of Condensed Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Other income									$ 24,405		$ 24,916		$ 12,674
Other expenses									24,422		31,542		29,614
Income tax benefit	13,754	12,768	14,285	11,861	14,796	13,587	11,681	13,257	52,668		53,321		36,742
Net income	25,270	23,477	26,253	23,361	27,958	25,153	23,277	25,503	98,361		101,891		74,496
Net earnings available to common shareholders	212	196	197	183	183	170	162	167	788	[1]	682	[1]	356	[1]
Umpqua Bank [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries									62,241		78,755		17,743
Other income									(2,321)		(2,174)		(2,127)
Total income									59,920		76,581		15,616
Management fees paid to subsidiaries									501		459		469
Other expenses									8,885		9,189		9,072
Total expenses									9,386		9,648		9,541
Income before income tax benefit and equity in undistributed earnings of subsidiaries									50,534		66,933		6,075
Income tax benefit									(4,446)		(4,904)		(4,325)
Net income before equity in undistributed earnings of subsidiaries									54,980		71,837		10,400
Equity in undistributed earnings of subsidiaries									43,381		30,054		64,096
Net income									98,361		101,891		74,496
Dividends and undistributed earnings allocated to participating securities									788		682		356
Net earnings available to common shareholders									$ 97,573		$ 101,209		$ 74,140

[1] Represents dividends paid and undistributed earnings allocated to nonvested restricted stock awards.