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Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance, December 31, 2023 | $ (373,001) |
Net current period OCI | (11,971) | $ 67,693
Ending Balance, March 31, 2024 | (384,972) |
Available-for-Sale Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance, December 31, 2023 | (194,628) |
OCI before reclassifications | (12,293) |
Amounts reclassified from AOCI | (61) |
Net current period OCI | (12,354) |
Ending Balance, March 31, 2024 | (206,982) |
Investments Subtotal |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance, December 31, 2023 | (279,070) |
OCI before reclassifications | (14,767) |
Amounts reclassified from AOCI | 2,032 |
Net current period OCI | (12,735) |
Ending Balance, March 31, 2024 | (291,805) |
Credit Loss Related |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance, December 31, 2023 | (84,442) |
OCI before reclassifications | (2,474) |
Amounts reclassified from AOCI | 2,093 |
Net current period OCI | (381) |
Ending Balance, March 31, 2024 | (84,823) |
Defined benefit pension and post-retirement life plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance, December 31, 2023 | (93,931) |
OCI before reclassifications | 0 |
Amounts reclassified from AOCI | 764 |
Net current period OCI | 764 |
Ending Balance, March 31, 2024 | (93,167) |
Total AOCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance, December 31, 2023 | (373,001) |
OCI before reclassifications | (14,767) |
Amounts reclassified from AOCI | 2,796 |
Net current period OCI | (11,971) | $ 67,693
Ending Balance, March 31, 2024 | $ (384,972) |

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