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v3.23.3

Investments - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) security | Sep. 30, 2023 USD ($) security | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Debt and Equity Securities [Line Items] |  |  |  |
Principal amount of bonds and certificates of deposit | $ 612,400,000 | $ 612,400,000 |  |
Securities exceeding 10% of Shareholders' Equity | 0 | 0 | $ 0 | $ 0
Non-income producing securities | 0 | 0 |  |
Open reverse repurchase commitments | 0 | 0 | 0 | 0
Securities sold under agreements to repurchase | $ 0 | $ 0 | 0 | 0
Debt securities, available-for-sale, unrealized loss position, number of positions downgraded | security | 14 | 14 |  |
Debt securities, available-for-sale, unrealized loss position, fair value, downgraded in period | $ 144,200,000 | $ 144,200,000 |  |
Debt securities, available-for-sale, unrealized loss position, accumulated loss, downgraded in period | 7,100,000 | 7,100,000 |  |
Debt securities, available-for-sale, allowance for credit loss, not previously recorded |  | 0 | 0 |
Debt securities, available-for-sale, allowance for credit loss | $ 0 | 0 | 0 | 0
Debt securities, available-for-sale, allowance for credit loss, write-off |  | $ 0 | $ 0 | $ 0
Recovery of impairment, other assets, number of positions | security |  | 3 |  |
Percent change in investment income | 59.00% | 53.00% |  |
Percent change in book yield | 32.00% | 39.00% |  |

X
- Definition Amount of accumulated unrealized loss on debt securities with credit rating downgrades during the period. These securities are measured at fair value with changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position, without a credit loss allowance. + References No definition available. + Details
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- Definition Amount of investment in debt securities with a credit rating downgrade during the period. These securities are measure at fair value with the changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position without an allowance for credit losses. + References No definition available. + Details
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- Definition Number of investments in debt securities with a credit rating downgrade during the period. These securities are measured at fair value with the changes in fair value recognized in other comprehensive income (available-for-sale), in an unrealized loss position, without an allowance for credit losses. + References No definition available. + Details
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- Definition Number of positions for which a portion of the prior impairment was recovered during the period as a result of litigation settlements. The original positions and impairments were recorded as part of other assets on the Balance Sheets + References No definition available. + Details
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