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Investments - Schedule of Net Realized and Unrealized Investment Gains and (Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Gain (Loss) on Securities [Line Items]      
Gross gains on sales $ 12,839 $ 5,896 $ 28,419
Gross losses on sales (6,563) (30,760) (60,055)
Net realized gains (losses) on disposals 6,276 (24,864) (31,636)
Net unrealized gains (losses) on equity securities (1,964) 9,510 (32,127)
Losses on securities for which we have the intent to sell (1,248) (921) (11,823)
Other realized gains (losses) (602) 0 0
Net realized and unrealized investment gains (losses) (2,949) (3,552) (114,808)
AFS securities      
Gain (Loss) on Securities [Line Items]      
Net credit loss benefit (expense) (5,628) 12,898 (39,169)
Held-to-Maturity ("HTM") securities      
Gain (Loss) on Securities [Line Items]      
Net credit loss benefit (expense) 0 0 63
CMLs      
Gain (Loss) on Securities [Line Items]      
Net credit loss benefit (expense) $ 217 $ (175) $ (116)