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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 |

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