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Comprehensive Income - Schedule of Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized and unrealized investment gains (losses) $ (2,949) $ (3,552) $ (114,808)
Loss and loss expense incurred 3,164,484 2,484,285 2,111,778
Other insurance expenses 453,235 433,742 400,313
Income before federal income tax 258,034 458,412 280,186
Total federal income tax expense (51,022) (93,174) (55,300)
Net income 207,012 365,238 $ 224,886
Reclassification out of AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income 5,998 8,364  
Reclassification out of AOCI | Net realized (gains) losses on disposals and intent-to-sell AFS securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized and unrealized investment gains (losses) (1,903) 20,458  
Total federal income tax expense 399 (4,296)  
Net income (1,504) 16,162  
Reclassification out of AOCI | Credit loss related      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized and unrealized investment gains (losses) 5,628 (12,898)  
Total federal income tax expense (1,182) 2,709  
Net income 4,446 (10,189)  
Reclassification out of AOCI | Defined benefit pension and post-retirement life plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Loss and loss expense incurred 890 695  
Other insurance expenses 2,978 2,331  
Income before federal income tax 3,868 3,026  
Total federal income tax expense (812) (635)  
Net income $ 3,056 $ 2,391