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Business Combinations (Tables) | 9 Months Ended
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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 Stockholders | 87,632 |
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 securities | 2,828 |  |  |
| Loans held for sale | 1 |  |  |
| Loans and leases | 11,382 |  |  |
| Restricted equity securities | 98 |  |  |
| Premises and equipment | 53 |  |  |
| Other intangible assets | 355 |  |  |
| Deferred tax asset, net | 132 |  |  |
| Other assets | 889 |  |  |
| Total assets acquired | $ | 16,612 |  |  |
Fair value of liabilities assumed: |  |  |
| Deposits | $ | 14,542 |  |  |
| Other liabilities | 167 |  |  |
| 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 Ended |  | Nine Months Ended
(in millions) |  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024
Personnel |  | $ | 39 |  |  | $ | 2 |  |  | $ | 53 |  |  | $ | 8 |
Premises and equipment |  | 17 |  |  | — |  |  | 17 |  |  | 1 |
Legal and professional |  | 26 |  |  | — |  |  | 29 |  |  | — |
Other |  | 1 |  |  | — |  |  | 2 |  |  | — |
Total acquisition-related expenses |  | $ | 83 |  |  | $ | 2 |  |  | $ | 101 |  |  | $ | 9 |
Business Acquisition, Pro Forma Information |
| Unaudited Pro Forma for the
| Three Months Ended |  | Nine Months Ended
(in millions) | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 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.

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