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Investments - Net Realized and Unrealized Investment Gains and (Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Gain (Loss) on Securities [Line Items]    
Gross gains on sales $ 2,135 $ 3,784
Gross losses on sales (1,965) (12,930)
Net realized gains (losses) on disposals 170 (9,146)
Net unrealized gains (losses) on equity securities 692 3,248
Losses on securities for which we have the intent to sell (15) (304)
Net realized and unrealized investment gains (losses) (1,635) 3,344
Available-for-Sale Securities    
Gain (Loss) on Securities [Line Items]    
Net credit loss benefit (expense) (2,650) 9,529
Commercial mortgage loans ("CMLs")    
Gain (Loss) on Securities [Line Items]    
Net credit loss benefit (expense) $ 168 $ 17