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Fair value measurements - Schedule of Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | $ 343,400 | $ 8,700
Fair value derivative asset | 38 | 13
Notional derivative liability | 10,193,400 | 6,878,700
Fair value derivative liability | 4,978 | 737
TBAs | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | 8,400 | 3,700
Fair value derivative asset | 38 | 11
Notional derivative liability | 8,400 | 3,700
Fair value derivative liability | 42 | 2
Futures | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | 335,000 | 5,000
Fair value derivative asset | 0 | 2
Notional derivative liability | 10,185,000 | 6,875,000
Fair value derivative liability | $ 4,936 | $ 735

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