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Fair value measurements - Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, Notional | $ 360 | $ 8,700
Derivatives asset, Fair Value | 0 | 13
Derivative liability, notional | 11,475,360 | 6,878,700
Derivative liability, Fair Value | 1,071 | 737
Other contracts | TBAs |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, Notional | 360 | 3,700
Derivatives asset, Fair Value | 0 | 11
Derivative liability, notional | 360 | 3,700
Derivative liability, Fair Value | 0 | 2
Commodity contracts | Futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, Notional |  | 5,000
Derivatives asset, Fair Value |  | 2
Derivative liability, notional | 11,475,000 | 6,875,000
Derivative liability, Fair Value | $ 1,071 | $ 735

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