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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net realized and unrealized investment (losses) gains $ (42,880) $ 10,057 $ (83,232) $ 15,176
Net investment income earned 70,222 83,731 142,824 153,447
Loss and loss expense incurred 524,868 421,623 1,019,104 835,024
Other insurance expenses 101,514 94,862 195,504 183,772
Income before federal income tax 49,904 153,198 119,794 288,830
Total federal income tax expense (10,384) (31,315) (23,944) (57,677)
Net income (loss) 39,520 121,883 95,850 231,153
Reclassification out of AOCI        
Net income (loss) 26,945 (1,203) 57,329 3,767
Pension Plan [Member] | Reclassification out of AOCI        
Loss and loss expense incurred 84 160 180 319
Other insurance expenses 333 533 654 1,067
Income before federal income tax 417 693 834 1,386
Total federal income tax expense (87) (145) (175) (291)
Net income (loss) 330 548 659 1,095
Held-to-maturity Securities [Member] | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 0 0 0 0
Net investment income earned 0 (3) 1 (5)
Income before federal income tax 0 (3) 1 (5)
Total federal income tax expense 0 1 0 1
Net income (loss) 0 (2) 1 (4)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 18,170 58 34,161 662
Income before federal income tax 18,170 58 34,161 662
Total federal income tax expense (3,816) (12) (7,174) (139)
Net income (loss) 14,354 46 26,987 523
Available for sale securities, including credit losses | Reclassification out of AOCI        
Net realized and unrealized investment (losses) gains 15,519 (2,272) 37,571 2,725
Income before federal income tax 15,519 (2,272) 37,571 2,725
Total federal income tax expense (3,258) 477 (7,889) (572)
Net income (loss) $ 12,261 $ (1,795) $ 29,682 $ 2,153