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Investments (Tables)
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity
The amortized cost and estimated fair value of available-for-sale investments, at March 31, 2025, by contractual maturity, were as follows:
Amortized
Cost		Estimated
Fair Value
Due in one year or less$135,653 $135,297 
Due after one year through five years58,649 57,690 
Due after five years through ten years57,785 55,980 
Due after ten years977 977 
253,064 249,944 
Residential mortgage-backed securities3,447 3,445 
Commercial mortgage-backed securities2,067 2,049 
Collateralized debt obligations2,941 2,954 
Other asset-backed securities4,773 4,787 
Total$266,292 $263,179 
Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments
The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, which at March 31, 2025 and December 31, 2024, did not have an allowance for credit losses. This information is aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at March 31, 2025 and December 31, 2024:
March 31, 2025December 31, 2024
Less Than 12 Months12 Months or MoreTotalLess Than 12 Months12 Months or MoreTotal
Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss		Fair 
Value		Gross
Unrealized
Loss
Fixed maturity securities:
Municipal obligations$2,070 $35 $6,660 $373 $8,730 $408 $6,042 $112 $6,582 $458 $12,624 $570 
Corporate obligations9,782 135 42,021 3,018 51,803 3,153 23,784 269 46,612 3,636 70,396 3,905 
Foreign obligations— — — — — — — — — — — — 
U.S. government obligations6,704 46 12,148 344 18,852 390 15,919 344 14,818 465 30,737 809 
Residential mortgage-backed securities1,899 18 — — 1,899 18 2,446 29 — — 2,446 29 
Commercial mortgage-backed securities750 22 — — 750 22 738 34 — — 738 34 
Collateralized debt obligations654 1 — — 654 1 655 2 — — 655 2 
Other asset-backed securities848 2 — — 848 2 1,428 2 — — 1,428 2 
Total temporarily impaired securities$24,475 $259 $60,829 $3,735 $85,304 $3,994 $51,012 $792 $68,012 $4,559 $119,024 $5,351 
Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments
The following table details amounts included in net investment gains (losses) and impairments included in earnings for the affected periods:
Three Months Ended March 31,20252024
Gross realized gains on securities$— $4 
Gross realized losses on securities(3)(3)
Foreign exchange gains (losses) — — 
Credit impairments— — 
Intent / requirement to sell impairments— — 
Net investment gains (losses), including impairments$(3)$1 
Equity Method Investments [Table Text Block] O
Summary of Net Investment Income
Net investment income (loss) was comprised of the following for the affected periods:
Three Months Ended March 31,20252024
Fixed maturity securities$1,400 $1,170 
Short-term investments1,457 2,590 
Loans35 — 
Investment expense2 (90)
Securities available-for-sale and short-term2,894 3,670 
Other investments(79)(30)
Total net investment income (loss)$2,815 $3,640 
Debt Securities, Available-for-Sale
The amortized cost and estimated fair value of available-for-sale investments, at March 31, 2025 and December 31, 2024, were as follows:
March 31, 2025:December 31, 2024:
Amortized
Cost		Allowance for Credit Losses Gross UnrealizedEstimated
Fair Value		Amortized
Cost		Allowance for Credit LossesGross UnrealizedEstimated
Fair Value
GainsLossesGainsLosses
Fixed maturity securities:
Municipal obligations$14,660 $— $53 $408 $14,305 $14,646 — $7 $570 $14,083 
Corporate obligations91,979 — 343 3,153 89,169 92,990 — 107 3,905 89,192 
U.S. government obligations44,821 — 429 390 44,860 41,706 — 98 809 40,995 
Residential mortgage-backed securities3,447 — 16 18 3,445 2,475 — — 29 2,446 
Commercial mortgage-backed securities2,067 — 4 22 2,049 2,127 — 8 34 2,101 
Collateralized debt obligations2,941 — 14 1 2,954 3,131 — 13 2 3,142 
Other asset-backed securities4,773 — 16 2 4,787 5,049 — 14 2 5,061 
164,688 — 875 3,994 161,569 162,124 — 247 5,351 157,020 
Short-term101,604 — 6 — 101,610 127,588 — 13 — 127,601 
Total available-for-sale investments$266,292 $— $881 $3,994 $263,179 $289,712 — $260 $5,351 $284,621