Regulatory Capital (Summary of Company's Capital Amounts And Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 1,279,586	$ 1,357,206
Capital to Risk Weighted Assets	14.66%	16.52%
Capital Required for Capital Adequacy	698,273	657,243
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	872,842	821,553
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier One Risk Based Capital	1,183,061	1,254,514
Tier One Risk Based Capital to Risk Weighted Assets	13.56%	15.27%
Tier One Risk Based Capital Required for Capital Adequacy	348,986	328,622
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	523,478	492,933
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Tier One Leverage Capital	1,183,061	1,254,514
Tier One Leverage Capital to Average Assets	10.90%	11.44%
Tier One Leverage Capital Required for Capital Adequacy	434,151	438,641
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	542,689	548,302
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Umpqua Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	1,177,782	1,234,010
Capital to Risk Weighted Assets	13.51%	15.03%
Capital Required for Capital Adequacy	697,428	656,825
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	871,785	821,031
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier One Risk Based Capital	1,081,282	1,131,373
Tier One Risk Based Capital to Risk Weighted Assets	12.40%	13.78%
Tier One Risk Based Capital Required for Capital Adequacy	348,801	328,410
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	523,201	492,615
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Tier One Leverage Capital	1,081,282	1,131,373
Tier One Leverage Capital to Average Assets	9.97%	10.32%
Tier One Leverage Capital Required for Capital Adequacy	433,814	438,517
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 542,268	$ 548,146
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%