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Fair Values of Financial Instruments - Summary of Carrying Amounts and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fixed maturity securities, fair value | $ 385,981 | $ 399,721
Fixed maturity securities-available-for-sale | 314,726 | 307,750
Equity securities | 55,476 | 58,629
Short-term investments | 11,569 | 9,338
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fixed maturity securities, fair value | 399,241 | 413,061
Fixed maturity securities-available-for-sale | 314,726 | 307,750
Equity securities | 55,476 | 58,629
Short-term investments | 11,569 | 9,338
Cash and cash equivalents | 44,753 | 44,045
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fixed maturity securities, fair value | 385,981 | 399,721
Fixed maturity securities-available-for-sale | 314,726 | 307,750
Equity securities | 55,476 | 58,629
Short-term investments | 11,569 | 9,338
Cash and cash equivalents | $ 44,753 | $ 44,045

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