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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 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. Upon the terms and subject to the conditions set forth in the Merger Agreement, (i) Merger Sub will merge with and into Pacific Premier, with Pacific Premier surviving the Merger, (ii) immediately following the Merger and as a part of a single integrated transaction, Pacific Premier will merge with and into Columbia, with Columbia continuing as the surviving entity, and (iii) promptly following such merger, Pacific Premier Bank, National Association, will merge with and into the Bank, with the Bank continuing as the surviving bank. Pursuant to the terms of the Merger Agreement, Pacific Premier stockholders will receive 0.9150 of a share of Columbia common stock for each Pacific Premier share they own. Following closing, Pacific Premier stockholders will own approximately 30% of the outstanding Columbia common stock. The combined company will have approximately $70 billion in assets and will be a market leader in the largest banking markets within the Western U.S. The closing of the Merger is subject to approvals from the Federal Reserve, the FDIC, the Oregon Department of Consumer and Business Services, Division of Financial Regulation, the shareholders of the Company, and the stockholders of Pacific Premier.