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Business Combinations and Asset Acquisitions - Assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands | Feb. 28, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | --- | ---
Asset Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 1,029,234 | $ 0 |
Umpqua Bank and Columbia Banking System Merger |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | $ 2,339,278 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 274,587 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans held for Sale | 2,358 |  |  |
Business Combination, Acquired Receivable, Fair Value | 10,884,218 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Equity Securities | 101,760 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 203,270 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 710,230 |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 256,288 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets | 571,773 |  |  |
Assets acquired | 19,230,586 | 19,230,586 |  | $ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 15,193,474 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits - Securities Sold Under Agreements to Repurcahse | 70,025 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits, Borrowings | 2,294,360 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits - Junior and Other Subordinated Debentures | 20,310 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities | 342,373 |  |  |
Liabilities assumed | 17,920,542 | 17,920,542 |  | 0
Net assets acquired | 1,310,044 | $ 1,310,044 |  | $ 0
Goodwill | 1,029,234 |  |  |
Umpqua Bank and Columbia Banking System Merger | Securities Investment |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities | $ 6,226,102 |  |  |

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