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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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