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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net realized and unrealized investment gains (losses) $ 3,344 $ (40,352)
Net investment income earned 91,506 72,602
Loss and loss expense incurred 567,438 494,236
Other insurance expenses 108,588 93,990
Income before federal income tax 114,759 69,890
Total federal income tax expense (22,185) (13,560)
Net income (loss) 92,574 56,330
Reclassification out of AOCI    
Net income (loss) (2,107) 30,384
Pension Plan [Member] | Reclassification out of AOCI    
Loss and loss expense incurred 175 96
Other insurance expenses 582 321
Income before federal income tax 757 417
Total federal income tax expense (159) (88)
Net income (loss) 598 329
Held-to-maturity Securities [Member] | Reclassification out of AOCI    
Net realized and unrealized investment gains (losses) 0 0
Net investment income earned 0 1
Income before federal income tax 0 1
Total federal income tax expense 0 0
Net income (loss) 0 1
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI    
Net realized and unrealized investment gains (losses) 6,104 15,991
Income before federal income tax 6,104 15,991
Total federal income tax expense (1,282) (3,358)
Net income (loss) 4,822 12,633
Available for sale securities, including credit losses | Reclassification out of AOCI    
Net realized and unrealized investment gains (losses) (9,529) 22,052
Income before federal income tax (9,529) 22,052
Total federal income tax expense 2,002 (4,631)
Net income (loss) $ (7,527) $ 17,421