Subsequent Events	9 Months Ended
Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent EventsOn October 25, 2022, the Board of Governors of the Federal Reserve System (the “Federal Reserve Board”) approved the application of Columbia with respect to the previously announced combination of Columbia and Umpqua pursuant to the Agreement and Plan of Merger (the “Merger Agreement”), dated as of October 11, 2021, by and among Umpqua, Columbia and Cascade Merger Sub, Inc. (“Merger Sub”). Completion of the transaction remains subject to receipt of required regulatory approvals, including approval from the FDIC, and other customary closing considerations set forth in the Merger Agreement.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI https://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration