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Subsequent Event	6 Months Ended
	Jun. 30, 2025
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 23, 2025, Columbia announced that it entered into the Merger Agreement with Pacific Premier, pursuant to which Columbia will acquire Pacific Premier in an all-stock transaction, with Pacific Premier stockholders receiving 0.9150 of a share of Columbia common stock for each share of Pacific Premier common stock held. Upon completion of the acquisition, Pacific Premier stockholders are expected to own approximately 30% of the combined company. On July 21, 2025, Columbia’s shareholders and Pacific Premier’s stockholders approved the acquisition at their respective special meetings. On August 6, 2025, Columbia and Pacific Premier jointly announced the receipt of all required regulatory approvals for the acquisition, including those from the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation, and the Oregon Department of Consumer and Business Services, Division of Financial Regulation. The acquisition is expected to close on or around August 31, 2025, subject to the satisfaction or waiver of the remaining customary closing conditions outlined in the Merger Agreement.

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- Definition

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.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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