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Available-for-sale securities - Narrative (Details)	Dec. 31, 2024 USD ($) position	Dec. 31, 2023 USD ($) position
Debt Securities, Available-for-Sale [Line Items]
Number of unrealized loss positions | position	44	50
Number of available-for-sale securities | position		50
Unrealized holding losses depreciation percentage from amortized cost	20.20%	19.00%
Asset Pledged as Collateral
Debt Securities, Available-for-Sale [Line Items]
Financial instruments, owned, at fair value	$ 60,200,000
AFS Debt securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit loss	0	$ 0
Debt Securities | Asset Pledged as Collateral
Debt Securities, Available-for-Sale [Line Items]
Financial instruments, owned, at fair value	$ 60,200,000	$ 68,500,000

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The number of available-for-sale securities held.

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Unrealized holding losses depreciation percentage from amortized cost.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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