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Business Combinations (Tables)
 9 Months Ended
Sep. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable
Fair value determinations required significant estimates and assumptions, including discount rates, expected cash flows, and market conditions and are inherently subjective. Management believes the preliminary estimates are reasonable; however, refinements may occur as additional information becomes available.

(in millions, shares in thousands)
Shares of Columbia common stock issued to Pacific Premier Stockholders87,632 
Columbia's market price per common share (in dollars) as of August 31, 2025$26.77 
Fair value of purchase price consideration transferred
$2,346 
Fair value of restricted stock exchanged$9 
Purchase price consideration$2,355 
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
(in millions)August 31, 2025
Purchase price consideration
Fair value of common shares issued and exchanged$2,355 
Total purchase price consideration
$2,355 
Fair value of assets acquired:
Cash and due from banks$874 
Investment securities2,828 
Loans held for sale1 
Loans and leases11,382 
Restricted equity securities98 
Premises and equipment53 
Other intangible assets355 
Deferred tax asset, net132 
Other assets889 
Total assets acquired$16,612 
Fair value of liabilities assumed:
Deposits$14,542 
Other liabilities167 
Total liabilities assumed$14,709 
Net assets acquired$1,903 
Goodwill$452 
Disclosure Detail of Reconciliation of Difference Between Purchase Price and Par The following summarizes these PCD loans as of the acquisition date:
(in millions)
August 31, 2025
Principal of PCD loans acquired$463 
PCD ACL at acquisition(5)
Non-credit discount on PCD loans(54)
Fair value of PCD loans$404 
Business Acquisition, Acquisition Related Expense
The following summarizes the impact of acquisition-related expenses for the periods presented:
Three Months EndedNine Months Ended
(in millions)September 30, 2025September 30, 2024September 30, 2025September 30, 2024
Personnel$39 $2 $53 $8 
Premises and equipment17 — 17 1 
Legal and professional26 — 29 — 
Other1 — 2 — 
Total acquisition-related expenses
$83 $2 $101 $9 
Business Acquisition, Pro Forma Information
Unaudited Pro Forma for the
Three Months EndedNine Months Ended
(in millions)September 30, 2025September 30, 2024September 30, 2025September 30, 2024
Net interest income$626 $619 $1,840 $1,882 
Non-interest income$90 $85 $260 $224 
Net income (1)
$242 $215 $618 $455 
(1) Pro forma net income for the three and nine months ended September 30, 2025 was adjusted to exclude acquisition-related costs of $135 million and $161 million, respectively, including historical Pacific Premier acquisition-related costs incurred during those periods. Pro forma net income for the nine months ended September 30, 2024 was adjusted to include acquisition-related costs of $161 million. The pro forma assumes acquisition-related costs were incurred the first quarter of 2024.