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Intangible Assets, Goodwill and Other (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Feb. 28, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 1,030,142,000		$ 0
Finite-Lived Intangible Asset, Useful Life	10 years
Goodwill and Intangible Asset Impairment	$ 0
Umpqua Bank and Columbia Banking System Merger
Goodwill [Line Items]
Goodwill		$ 1,030,142,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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