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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Available-for-Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Within one year, Amortized Cost $ 23,944 $ 25,995
After one year through five years, Amortized Cost 97,996 106,178
After five years through ten years, Amortized Cost 71,233 82,664
After ten years, Amortized Cost $ 121,257 $ 106,144
Investment, Type [Extensible Enumeration] Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Without single maturity date, Amortized Cost $ 4,545 $ 5,190
Available-for-sale, Amortized Cost 318,975 326,171
Within one year, Fair Value 23,806 25,875
After one year through five years, Fair Value 95,500 102,201
After five years through ten years, Fair Value 68,494 80,911
After ten years, Fair Value 115,891 103,332
Without single maturity date, Fair value 4,059 4,745
Available-for-sale, Fair Value $ 307,750 $ 317,064