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Investments - Temporarily Impaired Investments (Details) $ in Thousands | Jun. 30, 2025 USD ($) Investment
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Investments [Abstract] |
Number of investments (in Investment) | Investment | 379
Less than 12 months of temporary impairment | $ 1,124,924
Less than 12 months of temporary impairment | (1,310)
More than 12 months of temporary impairment | 14,998
More than 12 months of temporary impairment | (56)
Total temporary impairment | 1,139,922
Total temporary impairment | $ (1,366)
Corporate Debt Securities [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 252
Less than 12 months of temporary impairment | $ 544,205
Less than 12 months of temporary impairment | (728)
More than 12 months of temporary impairment | 1,958
More than 12 months of temporary impairment | (6)
Total temporary impairment | 546,163
Total temporary impairment | $ (734)
Debt Securities Issued by U.S. Government Agencies [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 44
Less than 12 months of temporary impairment | $ 87,403
Less than 12 months of temporary impairment | (140)
More than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | 0
Total temporary impairment | 87,403
Total temporary impairment | $ (140)
Debt Securities Issued by the U.S. Treasury [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 76
Less than 12 months of temporary impairment | $ 488,942
Less than 12 months of temporary impairment | (440)
More than 12 months of temporary impairment | 13,040
More than 12 months of temporary impairment | (50)
Total temporary impairment | 501,982
Total temporary impairment | $ (490)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 6
Less than 12 months of temporary impairment | $ 3,677
Less than 12 months of temporary impairment | (1)
More than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | 0
Total temporary impairment | 3,677
Total temporary impairment | $ (1)
Other Municipal Debt Securities [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 1
Less than 12 months of temporary impairment | $ 697
Less than 12 months of temporary impairment | (1)
More than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | 0
Total temporary impairment | 697
Total temporary impairment | $ (1)

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