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Collateralized transactions - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Loaned Transactions (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Reverse repurchase agreements |  |
Gross Amounts of Recognized Assets | $ 244,353 | $ 8,870
Gross Amounts Offset on the Balance Sheet | (244,353) | (3,028)
Net Amounts of Assets Presented on the Balance Sheet | 0 | 5,842
Financial Instruments | 0 | 0
Cash Collateral Received | 0 | 0
Net Amount | 0 | 5,842
Securities Borrowed |  |
Gross Amounts of Recognized Assets | 142,812 | 158,612
Gross Amounts Offset on the Balance Sheet | 0 | 0
Net Amounts of Assets Presented on the Balance Sheet | 142,812 | 158,612
Financial Instruments | (141,441) | (149,946)
Cash Collateral Received | 0 | 0
Net Amount | 1,371 | 8,666
Total |  |
Gross Amounts of Recognized Assets | 387,165 | 167,482
Gross Amounts Offset on the Balance Sheet | (244,353) | (3,028)
Net Amounts of Assets Presented on the Balance Sheet | 142,812 | 164,454
Financial Instruments | (141,441) | (149,946)
Cash Collateral Received | 0 | 0
Net Amount | 1,371 | 14,508
Repurchase agreements |  |
Gross Amounts of Recognized Liabilities |  | 643,410
Gross Amounts Offset on the Balance Sheet | (244,353) | (3,028)
Net Amounts of Liabilities Presented on the Balance Sheet | 765,102 | 640,382
Financial Instruments | (765,102) | (632,521)
Cash Collateral Pledged | 0 | 0
Net Amount | 0 | 7,861
Securities Loaned |  |
Gross Amounts of Recognized Liabilities |  | 284,987
Gross Amounts Offset on the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented on the Balance Sheet | 272,010 | 284,987
Financial Instruments | (260,349) | (276,688)
Cash Collateral Pledged | 0 | 0
Net Amount | 11,661 | 8,299
Total |  |
Gross Amounts of Recognized Liabilities | 1,281,465 | 928,397
Gross Amounts Offset on the Balance Sheet | (244,353) | (3,028)
Net Amounts of Liabilities Presented on the Balance Sheet | 1,037,112 | 925,369
Financial Instruments | (1,025,451) | (909,209)
Cash Collateral Pledged | 0 | 0
Net Amount | $ 11,661 | $ 16,160

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