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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	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Notional derivative asset	$ 10,215	$ 8,700
Fair value derivative asset	29	13
Notional derivative liability	9,900,215	6,878,700
Fair value derivative liability	1,456	737
TBAs | Other contracts
Derivatives, Fair Value [Line Items]
Notional derivative asset	10,215	3,700
Fair value derivative asset	29	11
Notional derivative liability	10,215	3,700
Fair value derivative liability	33	2
Futures | Commodity contracts
Derivatives, Fair Value [Line Items]
Notional derivative asset		5,000
Fair value derivative asset		2
Notional derivative liability	9,890,000	6,875,000
Fair value derivative liability	$ 1,423	$ 735

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