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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities
The following table sets forth the carrying amount and fair value of Ambac’s financial assets and liabilities as of June 30, 2025, and December 31, 2024, including the level within the fair value hierarchy at which fair value measurements are categorized. As required by the Fair Value Measurement Topic of the ASC, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
June 30, 2025December 31, 2024
Carrying
Amount		Total Fair
Value		Fair Value Measurements Categorized as:Carrying
Amount		Total Fair
Value		Fair Value Measurements Categorized as:
Level 1Level 2Level 3Level 1Level 2Level 3
Financial assets:
Fixed maturity securities:
Municipal obligations$14,308 $14,308 $— $14,308 $— $14,083 $14,083 $— $14,083 $— 
Corporate obligations92,100 92,100 — 92,100 — 89,192 89,192 — 89,192 — 
U.S. government obligations44,432 44,432 44,432 — — 40,995 40,995 40,995 — — 
Residential mortgage-backed securities3,362 3,362 — 3,362 — 2,446 2,446 — 2,446 — 
Commercial mortgage-backed securities1,920 1,920 — 1,920 — 2,101 2,101 — 2,101 — 
Collateralized debt obligations2,652 2,652 — 2,652 — 3,142 3,142 — 3,142 — 
Other asset-backed securities2,561 2,561 — 2,561 — 5,061 5,061 — 5,061 — 
Short term investments102,720 102,720 102,720 — — 127,601 127,601 127,601 — — 
Other investments (1)
28,193 7,486 89 — — 28,294 7,499 — — — 
Cash, cash equivalents and restricted cash47,085 47,085 47,085 — — 47,276 47,276 47,276 — — 
Other assets-loans3,503 3,503 — — 3,503 3,434 3,434 — — 3,434 
Other assets - Derivatives:
Warrants— — — — — — — — — — 
FX forward contracts790 790 — 790 — — — — — — 
Total financial assets$343,626 $322,919 $194,326 $117,693 $3,503 $363,625 $342,830 $215,872 $116,025 $3,434 
Financial liabilities:
Short-term debt, including accrued interest$152,944 $152,944 $152,944 $— $— $152,560 $152,560 $— $— $152,560 
Other liabilities - Derivatives:
FX forward contracts— — — — — 317 317 — 317 — 
Total financial liabilities$152,944 $152,944 $152,944 $— $— $152,877 $152,877 $— $317 $152,560 
(1)Excluded from the fair value measurement categories in the table above are investment funds of $7,486 and $7,499 as of June 30, 2025, and December 31, 2024, respectively, which are measured using NAV as a practical expedient. Also excluded from the fair value amounts in the table above are equity securities with a carrying value of $20,618 and $20,618 as of June 30, 2025, and December 31, 2024, respectively, that do not have readily determinable fair values and have carrying amounts determined using the measurement alternative, and an equity method investment of $89 and $177 as of June 30, 2025, and December 31, 2024.
Summary of Changes in Level 3 Fair Value Category
The following tables present the changes in the Level 3 fair value category for the periods presented in 2025 and 2024. Ambac classifies financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable either directly or indirectly. Thus, the gains and losses presented below include changes in the fair value related to both observable and unobservable inputs.
Level 3 - Financial Assets and Liabilities Accounted for at Fair Value
InvestmentsDerivativesTotal
Three Months Ended June 30, 2025:
Balance, beginning of period$— $— $— 
Total gains/(losses) realized and unrealized:
Included in earnings— — — 
Included in other comprehensive income— — — 
Purchases— — — 
Settlements— — — 
Balance, end of period$— $— $— 
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$— $— $— 
The amount of total gains/(losses) included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$— $— $— 
Three Months Ended June 30, 2024:
Balance, beginning of period$13,954 $609 $14,563 
Total gains/(losses) realized and unrealized:
Included in earnings6,016 (61)5,955 
Included in other comprehensive income91 — 91 
Purchases— — — 
Settlements(20,061)— (20,061)
Balance, end of period$— $548 $548 
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$6,016 $(61)$5,955 
The amount of total gains/(losses) included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$—$—$—
Level 3 - Financial Assets and Liabilities Accounted for at Fair Value
InvestmentsDerivativesTotal
Six Months Ended June 30, 2025:
Balance, beginning of period$— $— $— 
Total gains/(losses) realized and unrealized:
Included in earnings— — — 
Included in other comprehensive income— — — 
Settlements— — — 
Balance, end of period$— $— $— 
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$— $— $— 
The amount of total gains/(losses) included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$— $— $— 
Six Months Ended June 30, 2024:
Balance, beginning of period$13,920 $656 $14,576 
Total gains/(losses) realized and unrealized:
Included in earnings6,016 (108)5,908 
Included in other comprehensive income125 — 125 
Settlements(20,061)— (20,061)
Balance, end of period$— $548 $548 
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$6,016 $(108)$5,908 
The amount of total gains/(losses) included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date$— $— $— 
Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings
Gains and losses (realized and unrealized) relating to Level 3 assets and liabilities included in earnings for the affected periods are reported as follows:
Three Months Ended June 30, 2025Three Months Ended June 30, 2024
Net
Investment
Income		Net Gains
(Losses) on
Derivative
Contracts		Other
Income or
(Expense)		Net
Investment
Income		Net Gains
(Losses) on
Derivative
Contracts		Other
Income or
(Expense)
Total gains (losses) included in earnings for the period$—$—$—$—$(61)$6,016
Changes in unrealized gains (losses) relating to financial instruments still held at the reporting date————(61)—
Six Months Ended June 30, 2025Six Months Ended June 30, 2024
Net
Investment
Income		Net Gains
(Losses) on
Derivative
Contracts		Other
Income or
 (Expense)		Net
Investment
Income		Net Gains
(Losses) on
Derivative
Contracts		Other
Income or
 (Expense)
Total gains or losses included in earnings for the period$—$—$—$—$(108)$6,016
Changes in unrealized gains or losses included in earnings relating to the assets and liabilities still held at the reporting date————(108)—