Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets (Narative) (Details) - USD ($)	12 Months Ended
	Dec. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 0	$ 0
Bank Susidiaries except The Commerce Bank of Oregon [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 0
Subsequent Event [Member]
Goodwill [Line Items]
Amortization of Intangible Assets	$ 1,000,000