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Schedule II - Parent Corporation Financial Statements - Parent Corporation Balance Sheets - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Fixed income securities, available-for-sale, allowance for credit loss | $ 31,948 | $ 28,212 | $ 45,721
Fixed income securities, available-for-sale, amortized cost | $ 8,476,078 | $ 7,880,697 |
Preferred stock, par or stated value (in dollars per share) | $ 0 | $ 0 |
Preferred stock, authorized (in shares) | 5,000,000 | 5,000,000 |
Preferred stock, issued (in shares) | 8,000 | 8,000 |
Preferred stock, liquidation preference (in dollars per share) | $ 25,000 | $ 25,000 |
Common stock, par or stated value (in dollars per share) | $ 2 | $ 2 |
Common stock, authorized (in shares) | 360,000,000 | 360,000,000 |
Common stock, shares, issued (in shares) | 105,609,364 | 105,223,307 |
Treasury stock, common (in shares) | 44,761,468 | 44,586,870 |
Parent Company |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Fixed income securities, available-for-sale, allowance for credit loss | $ 380 | $ 426 |
Fixed income securities, available-for-sale, amortized cost | $ 288,852 | $ 443,261 |

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