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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net realized and unrealized investment gains (losses) $ 17,599 $ (4,217) $ 14,422
Net investment income 326,589 227,107 222,543
Income before federal income tax 505,310 302,988 336,390
Income Tax Expense (Benefit) 101,473 56,633 64,767
Net income 403,837 246,355 271,623
Loss and loss expense incurred 1,813,984 1,635,823 1,551,491
Policy acquisition costs 375,931 366,941 358,069
Total defined benefit pension and post-retirement plans 19,283 3,579 $ (8,799)
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net income 4,577 10,594  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member]      
Income before federal income tax 2,772 3,015  
Income Tax Expense (Benefit) (582) (633)  
Net income 2,190 2,382  
Loss and loss expense incurred 638 647  
Policy acquisition costs 2,134 2,368  
Held-to-maturity Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) (14) (16)  
Net investment income 3 (8)  
Income before federal income tax (11) (24)  
Income Tax Expense (Benefit) 2 (5)  
Net income (9) (19)  
AOCI, Gain (Loss), Debt Securities, Available-for-sale, without Allowance for Credit Loss, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) (3,825) 5,376  
Income before federal income tax (3,825) 5,376  
Income Tax Expense (Benefit) 803 (1,129)  
Net income (3,022) 4,247  
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Net realized and unrealized investment gains (losses) 6,858 5,042  
Income before federal income tax 6,858 5,042  
Income Tax Expense (Benefit) (1,440) 1,058  
Net income $ 5,418 $ 3,984