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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

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