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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
Sep. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Within one year, Amortized Cost $ 17,898 $ 25,995
After one year through five years, Amortized Cost 104,803 106,178
After five years through ten years, Amortized Cost 73,094 82,664
After ten years, Amortized Cost $ 117,998 $ 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 $ 4,702 $ 5,190
Available-for-sale, Amortized Cost 318,495 326,171
Within one year, Fair Value 17,728 25,875
After one year through five years, Fair Value 103,134 102,201
After five years through ten years, Fair Value 73,199 80,911
After ten years, Fair Value 116,692 103,332
Without single maturity date, Fair value 4,361 4,745
Available-for-sale, Fair Value $ 315,114 $ 317,064