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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