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Net realized and unrealized gains - Proceeds from the Sale of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Proceeds from sales of debt securities $ 12,544 $ 20,767
Proceeds from sales of equity securities 3,465 107
Total proceeds from sales of investments in securities $ 16,009 $ 20,874