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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, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | $ 13,985 | $ 360
Fair value derivative asset | 83 | 0
Notional derivative liability | 16,013,985 | 11,475,360
Fair value derivative liability | 1,068 | 1,071
Futures | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional derivative liability | 16,000,000 | 11,475,000
Fair value derivative liability | 982 | 1,071
TBAs | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | 13,985 | 360
Fair value derivative asset | 83 | 0
Notional derivative liability | 13,985 | 360
Fair value derivative liability | $ 86 | $ 0

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