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Investments - Temporarily Impaired Investments (Details) $ in Thousands | Sep. 30, 2025 USD ($) Investment
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Investments [Abstract] |
Number of investments (in Investment) | Investment | 174
Less than 12 months of temporary impairment | $ 392,289
Less than 12 months of temporary impairment | (261)
More than 12 months of temporary impairment | 119,526
More than 12 months of temporary impairment | (115)
Total temporary impairment | 511,815
Total temporary impairment | $ (376)
Corporate Debt Securities [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 105
Less than 12 months of temporary impairment | $ 179,031
Less than 12 months of temporary impairment | (127)
More than 12 months of temporary impairment | 55,955
More than 12 months of temporary impairment | (63)
Total temporary impairment | 234,986
Total temporary impairment | $ (190)
Debt Securities Issued by U.S. Government Agencies [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 43
Less than 12 months of temporary impairment | $ 71,369
Less than 12 months of temporary impairment | (60)
More than 12 months of temporary impairment | 17,286
More than 12 months of temporary impairment | (16)
Total temporary impairment | 88,655
Total temporary impairment | $ (76)
Debt Securities Issued by the U.S. Treasury [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 25
Less than 12 months of temporary impairment | $ 141,191
Less than 12 months of temporary impairment | (74)
More than 12 months of temporary impairment | 46,285
More than 12 months of temporary impairment | (36)
Total temporary impairment | 187,476
Total temporary impairment | $ (110)
Other Municipal Debt Securities [Member] |
Investments [Abstract] |
Number of investments (in Investment) | Investment | 1
Less than 12 months of temporary impairment | $ 698
Less than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | 0
Total temporary impairment | 698
Total temporary impairment | $ 0

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