Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2012

Regulatory Capital [Abstract]

Summary Of Company's Capital Amounts And Ratios

				For Capital			To be Well
	Actual			Adequacy purposes			Capitalized
	Amount		Ratio	Amount		Ratio	Amount		Ratio
As of December 31, 2012
Total Capital
(to Risk Weighted Assets)
Consolidated	$	1,357,206	16.52%	$	657,243	8.00%	$	821,553	10.00%
Umpqua Bank	$	1,234,010	15.03%	$	656,825	8.00%	$	821,031	10.00%
Tier I Capital
(to Risk Weighted Assets)
Consolidated	$	1,254,514	15.27%	$	328,622	4.00%	$	492,933	6.00%
Umpqua Bank	$	1,131,373	13.78%	$	328,410	4.00%	$	492,615	6.00%
Tier I Capital
(to Average Assets)
Consolidated	$	1,254,514	11.44%	$	438,641	4.00%	$	548,302	5.00%
Umpqua Bank	$	1,131,373	10.32%	$	438,517	4.00%	$	548,146	5.00%
As of December 31, 2011
Total Capital
(to Risk Weighted Assets)
Consolidated	$	1,287,560	17.16%	$	600,261	8.00%	$	750,326	10.00%
Umpqua Bank	$	1,163,611	15.53%	$	599,413	8.00%	$	749,267	10.00%
Tier I Capital
(to Risk Weighted Assets)
Consolidated	$	1,193,740	15.91%	$	300,123	4.00%	$	450,185	6.00%
Umpqua Bank	$	1,069,914	14.28%	$	299,696	4.00%	$	449,544	6.00%
Tier I Capital
(to Average Assets)
Consolidated	$	1,193,740	10.91%	$	437,668	4.00%	$	547,085	5.00%
Umpqua Bank	$	1,069,914	9.78%	$	437,593	4.00%	$	546,991	5.00%