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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