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Subsequent Events | 9 Months Ended
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Sep. 30, 2021
Subsequent Events [Abstract] |
Subsequent Events | Subsequent Events On October 1, 2021, the Company completed its previously announced merger with Bank of Commerce, for a total consideration of approximately $256.3 million. Through the merger, the Company acquired 100% of the voting equity interests of Bank of Commerce. The operating results of the Company for the nine months ended September 30, 2021 do not include the operating results of Bank of Commerce as the acquisition did not close until after the close of business on September 30, 2021. It is not practical to present other financial information related to the acquisition at this time because the fair value measurement of assets acquired and liabilities assumed has not been finalized. On October 12, 2021, Columbia Banking System, Inc. and Umpqua Holdings Corporation (“Umpqua”) jointly announced a definitive agreement to combine, creating the second largest regionally focused bank by market share on the West Coast with assets exceeding $50 billion. Upon closing, this combination will create a broad network of more than 300 locations across Washington, Oregon, Idaho, California and Nevada under the Umpqua brand with wealth management services and products offered under the Columbia brand. The name of our parent company will remain Columbia Banking System, Inc. and our stock will continue to be traded under the “COLB” symbol. There can be no assurances this transaction will close on a timely basis or at all.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://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 http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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