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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 24,254 $ 24,735
Fixed income securities, available-for-sale, allowance for credit loss (29,076) (31,948)
Fixed income securities, available-for-sale, amortized cost 9,409,353 8,476,078
Commercial mortgage loans, fair value 269,141 224,842
Equity securities, cost 365,497 211,486
Property and equipment, accumulated depreciation and amortization $ 306,543 $ 287,685
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, issued (in shares) 105,938,680 105,609,364
Treasury stock, common (in shares) 45,532,490 44,761,468