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Special Purpose Entities, Including Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Variable Interest Entities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 428,432 $ 289,712
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,181 260
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 2,687 $ 5,351