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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net realized and unrealized investment gains (losses) $ (3,552) $ (114,808) $ 17,599
Net investment income earned 388,650 288,155 326,589
Loss and loss expense incurred 2,484,285 2,111,778 1,813,984
Other insurance expenses 433,742 400,313 375,931
Income before federal income tax 458,412 280,186 505,310
Total federal income tax expense (93,174) (55,300) (101,473)
Net income 365,238 224,886 $ 403,837
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net income 8,364 79,702  
Retirement Income Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Loss and loss expense incurred 695 359  
Other insurance expenses 2,331 1,309  
Income before federal income tax 3,026 1,668  
Total federal income tax expense (635) (351)  
Net income 2,391 1,317  
Held-to-maturity Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) 0 (7)  
Net investment income earned 0 11  
Income before federal income tax 0 4  
Total federal income tax expense 0 (1)  
Net income 0 3  
Available for sale securities, excluding credit losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) 20,458 60,048  
Income before federal income tax 20,458 60,048  
Total federal income tax expense (4,296) (12,610)  
Net income 16,162 47,438  
Available for sale securities, including credit losses | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) (12,898) 39,169  
Income before federal income tax (12,898) 39,169  
Total federal income tax expense 2,709 (8,225)  
Net income $ (10,189) $ 30,944