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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net realized and unrealized investment gains (losses) $ (114,808) $ 17,599 $ (4,217)
Net investment income earned 288,155 326,589 227,107
Income before federal income tax 280,186 505,310 302,988
Total federal income tax expense (55,300) (101,473) (56,633)
Net income 224,886 403,837 246,355
Loss and loss expense incurred 2,111,778 1,813,984 1,635,823
Other insurance expenses 400,313 375,931 $ 366,941
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net income 79,702 4,577  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member]      
Income before federal income tax 1,668 2,772  
Total federal income tax expense 351 582  
Net income 1,317 2,190  
Loss and loss expense incurred 359 638  
Other insurance expenses 1,309 2,134  
Held-to-maturity Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) (7) (14)  
Net investment income earned 11 3  
Income before federal income tax 4 (11)  
Total federal income tax expense 1 2  
Net income 3 (9)  
Available for sale securities, excluding credit losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) 60,048 (3,825)  
Income before federal income tax 60,048 (3,825)  
Total federal income tax expense 12,610 803  
Net income 47,438 (3,022)  
Available for sale securities, including credit losses | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) 39,169 6,858  
Income before federal income tax 39,169 6,858  
Total federal income tax expense 8,225 (1,440)  
Net income $ 30,944 $ 5,418