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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net realized and unrealized investment gains (losses) | $ 10,057 | $ 12,649 | $ 15,176 | $ (32,017)
Net investment income earned | 83,731 | 34,444 | 153,447 | 90,411
Loss and loss expense incurred | 421,623 | 403,949 | 835,024 | 804,273
Other insurance expenses | 94,862 | 84,601 | 183,772 | 179,947
Income before federal income tax | 153,198 | 42,693 | 288,830 | 58,690
Total federal income tax expense | (31,315) | (8,510) | (57,677) | (9,271)
Net income | 121,883 | 34,183 | 231,153 | 49,419
Reclassification out of AOCI |  |  |  |
Net income | (1,203) | (4,652) | 3,767 | 17,384
Pension Plan [Member] | Reclassification out of AOCI |  |  |  |
Loss and loss expense incurred | 160 | 162 | 319 | 324
Other insurance expenses | 533 | 591 | 1,067 | 1,183
Income before federal income tax | 693 | 753 | 1,386 | 1,507
Total federal income tax expense | (145) | (158) | (291) | (316)
Net income | 548 | 595 | 1,095 | 1,191
Held-to-maturity Securities [Member] | Reclassification out of AOCI |  |  |  |
Net realized and unrealized investment gains (losses) | 0 | 0 | 0 | 1
Net investment income earned | (3) | (31) | (5) | (7)
Income before federal income tax | (3) | (31) | (5) | (6)
Total federal income tax expense | 1 | 6 | 1 | 1
Net income | (2) | (25) | (4) | (5)
Available for sale securities, excluding credit losses [Member] | Reclassification out of AOCI |  |  |  |
Net realized and unrealized investment gains (losses) | 58 | (1,686) | 662 | 9,641
Income before federal income tax | 58 | (1,686) | 662 | 9,641
Total federal income tax expense | (12) | 354 | (139) | (2,025)
Net income | 46 | (1,332) | 523 | 7,616
Available for sale securities, including credit losses | Reclassification out of AOCI |  |  |  |
Net realized and unrealized investment gains (losses) | (2,272) | (4,924) | 2,725 | 10,863
Income before federal income tax | (2,272) | (4,924) | 2,725 | 10,863
Total federal income tax expense | 477 | 1,034 | (572) | (2,281)
Net income | $ (1,795) | $ (3,890) | $ 2,153 | $ 8,582

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