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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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Nominal or face amount used to calculate payments on the derivative asset.

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