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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 | Mar. 31, 2026 | Dec. 31, 2025
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Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | $ 20,075 | $ 9,900
Fair value derivative asset | 98 | 34
Notional derivative liability | 14,440,075 | 13,969,900
Fair value derivative liability | 3,904 | 160
Futures | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional derivative liability | 14,420,000 | 13,960,000
Fair value derivative liability | 3,812 | 133
TBAs | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional derivative asset | 20,075 | 9,900
Fair value derivative asset | 98 | 34
Notional derivative liability | 20,075 | 9,900
Fair value derivative liability | $ 92 | $ 27

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