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Investments Realized and Unrealized Gains (Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]      
Gross gains on sales $ 5,896 $ 28,419 $ 15,284
Gross losses on sales (30,760) (60,055) (8,140)
Net realized investment gains (losses) on disposals (24,864) (31,636) 7,144
Net unrealized (losses) gains on equity securities 9,510 (32,127) 17,881
Losses on securities for which we have the intent to sell (921) (11,823) (519)
Net realized and unrealized investment gains (losses) (3,552) (114,808) 17,599
Available-for-sale Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Net credit loss (expense) benefit 12,898 (39,169) (6,858)
Held-to-maturity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Net credit loss (expense) benefit 0 63 (49)
Commercial Mortgage Loans [Member]      
Gain (Loss) on Securities [Line Items]      
Net credit loss (expense) benefit $ (175) $ (116) $ 0