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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
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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

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- Definition The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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