Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2020

Brokers and Dealers [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

The following table shows the Company's consolidated and the Bank's capital adequacy ratios compared to the regulatory minimum capital ratio and the regulatory minimum capital ratio needed to qualify as a "well-capitalized" institution, as calculated under regulatory guidelines of Basel III at December 31, 2020 and 2019:

	Actual				For Capital Adequacy Purposes				To be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2020
Total Capital
(to Risk Weighted Assets)
Consolidated	$	3,347,926	15.63	%	$	1,713,891	8.00	%	$	2,142,364	10.00	%
Umpqua Bank	$	3,134,116	14.63	%	$	1,713,809	8.00	%	$	2,142,262	10.00	%
Tier 1 Capital
(to Risk Weighted Assets)
Consolidated	$	2,636,194	12.31	%	$	1,285,418	6.00	%	$	1,713,891	8.00	%
Umpqua Bank	$	2,873,383	13.41	%	$	1,285,357	6.00	%	$	1,713,809	8.00	%
Tier 1 Common
(to Risk Weighted Assets)
Consolidated	$	2,636,194	12.31	%	$	964,064	4.50	%	$	1,392,536	6.50	%
Umpqua Bank	$	2,873,383	13.41	%	$	964,018	4.50	%	$	1,392,470	6.50	%
Tier 1 Capital
(to Average Assets)
Consolidated	$	2,636,194	8.98	%	$	1,174,129	4.00	%	$	1,467,661	5.00	%
Umpqua Bank	$	2,873,383	9.79	%	$	1,174,065	4.00	%	$	1,467,581	5.00	%
December 31, 2019
Total Capital
(to Risk Weighted Assets)
Consolidated	$	3,104,444	13.96	%	$	1,779,265	8.00	%	$	2,224,081	10.00	%
Umpqua Bank	$	2,945,830	13.26	%	$	1,777,265	8.00	%	$	2,221,581	10.00	%
Tier 1 Capital
(to Risk Weighted Assets)
Consolidated	$	2,490,709	11.20	%	$	1,334,449	6.00	%	$	1,779,265	8.00	%
Umpqua Bank	$	2,783,095	12.53	%	$	1,332,949	6.00	%	$	1,777,265	8.00	%
Tier 1 Common
(to Risk Weighted Assets)
Consolidated	$	2,490,709	11.20	%	$	1,000,837	4.50	%	$	1,445,653	6.50	%
Umpqua Bank	$	2,783,095	12.53	%	$	999,712	4.50	%	$	1,444,028	6.50	%
Tier 1 Capital
(to Average Assets)
Consolidated	$	2,490,709	9.16	%	$	1,087,509	4.00	%	$	1,359,387	5.00	%
Umpqua Bank	$	2,783,095	10.24	%	$	1,086,999	4.00	%	$	1,358,749	5.00	%