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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 26,000 | $ 8,700
Derivatives asset, Fair Value | 185 | 13
Derivative liability, Notional | 9,606,000 | 6,878,700
Derivative liability, Fair Value | 1,891 | 737
TBAs | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 26,000 | 3,700
Derivatives asset, Fair Value | 185 | 11
Derivative liability, Notional | 26,000 | 3,700
Derivative liability, Fair Value | 177 | 2
Futures | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional |  | 5,000
Derivatives asset, Fair Value |  | 2
Futures | Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, Notional | 9,580,000 | 6,875,000
Derivative liability, Fair Value | $ 1,714 | $ 735

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