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Comprehensive Income (Loss) - Schedule of Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized and unrealized investment gains (losses) $ 229 $ (1,635)
Loss and loss expense incurred 746,325 704,292
Other insurance expenses 124,870 115,987
Income before federal income tax 138,886 102,566
Total federal income tax expense (benefit) (28,990) (20,048)
Net income (loss) 109,896 82,518
Reclassification out of AOCI    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income (loss) (24) 2,796
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) (274) (78)
Total federal income tax expense (benefit) 58 17
Net income (loss) (216) (61)
Reclassification out of AOCI | Credit loss related    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized and unrealized investment gains (losses) (629) 2,650
Total federal income tax expense (benefit) 132 (557)
Net income (loss) (497) 2,093
Reclassification out of AOCI | Defined Benefit Pension and Post-Retirement Plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Loss and loss expense incurred 201 222
Other insurance expenses 671 745
Income before federal income tax 872 967
Total federal income tax expense (benefit) (183) (203)
Net income (loss) $ 689 $ 764