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Deferred Policy Acquisition Costs - Schedule of Activity in the Deferred Policy Acquisition Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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