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Fair value measurements - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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