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Deferred Policy Acquisition Costs - Schedule of Activity in the Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |
Balance, beginning of year | $ 17,975 | $ 17,401 | $ 17,059
Policy acquisition costs deferred | 43,348 | 41,433 | 40,194
Amortization expense during the year | (42,172) | (40,859) | (39,852)
Balance, end of year | $ 19,151 | $ 17,975 | $ 17,401

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