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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 24,735 $ 21,923
Fixed income securities, available-for-sale, allowance for credit loss 31,948 28,212
Fixed income securities, available-for-sale, amortized cost 8,476,078 7,880,697
Commercial mortgage loans, fair value 224,842 178,913
Equity securities, cost 211,486 183,076
Property and equipment, accumulated depreciation and amortization $ 287,685 $ 271,409
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