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Collateralized transactions - Schedule of Disaggregation of Gross Obligation by Class of Collateral Pledged and Remaining Contractual Maturity of Repurchase Agreements and Securities Loaned Transactions (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
U.S. Treasury securities | $ 1,046,021 | $ 999,809
Corporate equities | 404,916 | $ 235,498
Overnight and Open |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross amount of recognized liabilities for repurchase agreements and securities loaned | $ 1,450,937 |

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