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Net realized and unrealized gains - Proceeds from the Sale of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales of debt securities $ 7,109 $ 12,361 $ 40,620 $ 33,129
Proceeds from sales of equity securities 213 944 3,686 1,147
Total proceeds from sales of investments in securities $ 7,322 $ 13,305 $ 44,306 $ 34,276