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Comprehensive Income - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year $ 2,954,381 $ 2,527,564  
OCI before reclassifications 30,158 116,677  
Amounts reclassified from AOCI 5,998 8,364  
Other comprehensive income (loss) 36,156 125,041 $ (613,141)
End of year 3,120,076 2,954,381 2,527,564
Total AOCI      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (373,001) (498,042) 115,099
Other comprehensive income (loss) 36,156 125,041 (613,141)
End of year (336,845) (373,001) (498,042)
Investments Subtotal      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (279,070) (417,035)  
OCI before reclassifications 25,865 131,992  
Amounts reclassified from AOCI 2,942 5,973  
Other comprehensive income (loss) 28,807 137,965  
End of year (250,263) (279,070) (417,035)
Credit Loss Related      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (84,442) (121,838)  
OCI before reclassifications 7,790 47,585  
Amounts reclassified from AOCI 4,446 (10,189)  
Other comprehensive income (loss) 12,236 37,396  
End of year (72,206) (84,442) (121,838)
All Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (194,628) (295,197)  
OCI before reclassifications 18,075 84,407  
Amounts reclassified from AOCI (1,504) 16,162  
Other comprehensive income (loss) 16,571 100,569  
End of year (178,057) (194,628) (295,197)
Defined Benefit Pension and Post-retirement Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of year (93,931) (81,007)  
OCI before reclassifications 4,293 (15,315)  
Amounts reclassified from AOCI 3,056 2,391  
Other comprehensive income (loss) 7,349 (12,924)  
End of year $ (86,582) $ (93,931) $ (81,007)