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Investments - Schedule of Net Realized and Unrealized Investment Gains and (Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Gain (Loss) on Securities [Line Items]        
Gross gains on sales $ 4,159 $ 367 $ 10,681 $ 5,307
Gross losses on sales (2,012) (5,264) (5,228) (30,146)
Net realized gains (losses) on disposals 2,147 (4,897) 5,453 (24,839)
Net unrealized gains (losses) on equity securities 2,407 489 3,006 8,662
Losses on securities for which we have the intent to sell (752) 0 (1,248) (645)
Other realized gains (losses) (602) 0 (602) 0
Net realized and unrealized investment gains (losses) 5,389 (6,880) 5,051 (8,962)
Available-for-Sale Securities        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) 2,191 (2,468) (1,692) 7,925
Commercial mortgage loans ("CMLs")        
Gain (Loss) on Securities [Line Items]        
Net credit loss benefit (expense) $ (2) $ (4) $ 134 $ (65)