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Fair value measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Transfers out of level 3	$ 1,600	$ 1,629
CMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Transfers out of level 3	$ 5,800	$ 5,796

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- Definition

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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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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