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	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Amortization of Intangible Assets			$ 6,000,000	$ 8,000,000	$ 9,000,000
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	$ 2,000,000