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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 265,902	$ 289,712
Debt Securities, Available-for-Sale	264,055
Amortized Cost, Due in one year or less	138,597
Amortized Cost, Due after one year through five years	53,212
Amortized Cost, Due after five years through ten years	62,642
Amortized Cost, Due after ten years	978
Amortized Cost, Total	255,429
Estimated Fair Value, Due in one year or less	138,260
Estimated Fair Value, Due after one year through five years	52,386
Estimated Fair Value, Due after five years through ten years	61,934
Estimated Fair Value, Due after ten years	980
Estimated Fair Value due, Total	253,560
Fixed Income Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	163,183	162,124
Debt Securities, Available-for-Sale	161,335	157,020
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,352	2,475
Debt Securities, Available-for-Sale	3,362	2,446
Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,935
Debt Securities, Available-for-Sale	1,920
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,642	3,131
Debt Securities, Available-for-Sale	2,652	3,142
Fixed Income Securities [Member] | Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,544	5,049
Debt Securities, Available-for-Sale	$ 2,561	$ 5,061

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