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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net realized and unrealized investment (losses) gain | $ 20,079 | $ 7,721 | $ 12,649 | $ (44,666) | $ (873) | $ (2,183) | $ 4,027 | $ 13,451 | $ (4,217) | $ 14,422 | $ (54,923)
Net investment income | 68,511 | 68,185 | 34,444 | 55,967 | 57,594 | 55,826 | 58,505 | 50,618 | 227,107 | 222,543 | 195,336
Income before federal income tax | 159,041 | 85,257 | 42,693 | 15,997 | 101,293 | 71,178 | 90,225 | 73,694 | 302,988 | 336,390 | 211,721
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 56,633 | 64,767 | 32,782
Net income | $ 127,061 | $ 69,875 | $ 34,183 | $ 15,236 | $ 81,859 | $ 56,150 | $ 72,266 | $ 61,348 | 246,355 | 271,623 | 178,939
Loss and loss expense incurred |  |  |  |  |  |  |  |  | 1,635,823 | 1,551,491 | 1,498,134
Policy acquisition costs |  |  |  |  |  |  |  |  | 366,941 | 358,069 | 331,318
Total defined benefit pension and post-retirement plans |  |  |  |  |  |  |  |  | 3,579 | (8,799) | $ (7,226)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 10,594 | 2,583 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Retirement Income Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Income before federal income tax |  |  |  |  |  |  |  |  | 3,015 | 2,657 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (633) | (558) |
Net income |  |  |  |  |  |  |  |  | 2,382 | 2,099 |
Loss and loss expense incurred |  |  |  |  |  |  |  |  | 647 | 582 |
Policy acquisition costs |  |  |  |  |  |  |  |  | 2,368 | 2,075 |
Held-to-maturity Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized investment (losses) gain |  |  |  |  |  |  |  |  | (16) | (46) |
Net investment income |  |  |  |  |  |  |  |  | (8) | (12) |
Income before federal income tax |  |  |  |  |  |  |  |  | (24) | (58) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 5 | (12) |
Net income |  |  |  |  |  |  |  |  | (19) | (46) |
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 (losses) gain |  |  |  |  |  |  |  |  | 5,376 | 671 |
Income before federal income tax |  |  |  |  |  |  |  |  | 5,376 | 671 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,129) | (141) |
Net income |  |  |  |  |  |  |  |  | 4,247 | 530 |
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 (losses) gain |  |  |  |  |  |  |  |  | 5,042 | 0 |
Income before federal income tax |  |  |  |  |  |  |  |  | 5,042 | 0 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,058) | 0 |
Net income |  |  |  |  |  |  |  |  | $ 3,984 | $ 0 |

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