Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2023

Broker-Dealer [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 as of December 31, 2023 and 2022:

	Actual				For Capital Adequacy Purposes				To be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2023
Total Capital (to Risk Weighted Assets)
Consolidated	$	4,770,335	11.86	%	$	3,218,301	8.00	%	$	4,022,876	10.00	%
Umpqua Bank	$	4,653,920	11.57	%	$	3,217,821	8.00	%	$	4,022,276	10.00	%
Tier 1 Capital (to Risk Weighted Assets)
Consolidated	$	3,876,985	9.64	%	$	2,413,726	6.00	%	$	3,218,301	8.00	%
Umpqua Bank	$	4,231,569	10.52	%	$	2,413,366	6.00	%	$	3,217,821	8.00	%
Tier 1 Common (to Risk Weighted Assets)
Consolidated	$	3,876,985	9.64	%	$	1,810,294	4.50	%	$	2,614,869	6.50	%
Umpqua Bank	$	4,231,569	10.52	%	$	1,810,024	4.50	%	$	2,614,479	6.50	%
Tier 1 Capital (to Average Assets)
Consolidated	$	3,876,985	7.60	%	$	2,040,344	4.00	%	$	2,550,431	5.00	%
Umpqua Bank	$	4,231,569	8.30	%	$	2,040,489	4.00	%	$	2,550,611	5.00	%
December 31, 2022
Total Capital (to Risk Weighted Assets)
Consolidated	$	3,651,382	13.71	%	$	2,130,565	8.00	%	$	2,663,207	10.00	%
Umpqua Bank	$	3,440,574	12.92	%	$	2,130,240	8.00	%	$	2,662,799	10.00	%
Tier 1 Capital (to Risk Weighted Assets)
Consolidated	$	2,934,708	11.02	%	$	1,597,924	6.00	%	$	2,130,565	8.00	%
Umpqua Bank	$	3,174,899	11.92	%	$	1,597,680	6.00	%	$	2,130,240	8.00	%
Tier 1 Common (to Risk Weighted Assets)
Consolidated	$	2,934,708	11.02	%	$	1,198,443	4.50	%	$	1,731,084	6.50	%
Umpqua Bank	$	3,174,899	11.92	%	$	1,198,260	4.50	%	$	1,730,820	6.50	%
Tier 1 Capital (to Average Assets)
Consolidated	$	2,934,708	9.14	%	$	1,283,669	4.00	%	$	1,604,586	5.00	%
Umpqua Bank	$	3,174,899	9.89	%	$	1,283,610	4.00	%	$	1,604,513	5.00	%