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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |
Common stock, shares issued | 48,875,167 | 46,659,144 |  |
Treasury Stock, Common, Shares | 2,368,194 | 1,463,774 |  |
Common Stock, Shares, Outstanding | 46,506,973 |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | $ 157,020 | $ 135,224 |  |
Short-term investments, at cost (approximates fair value) | 289,712 | 341,685 |  |
Other Investments | 28,294 | 18,317 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Investments, Total | 312,915 | 354,051 |  |
Investment income due and accrued | 1,703 | 1,569 |  |
Derivative assets | 0 | 656 |  |
Other assets | 92,317 | 65,817 |  |
Assets | 8,058,378 | 8,428,320 | $ 7,972,730 |
Liabilities: |  |  |  |
Liabilities | 6,862,857 | 6,996,627 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 489 | 467 |  |
Additional paid-in capital | 331,007 | 291,761 |  |
Accumulated other comprehensive income (loss) | (188,436) | (160,047) | (252,843) |
Retained earnings | 742,185 | 1,246,048 |  |
Common stock held in treasury at cost | (28,339) | (16,573) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 856,906 | 1,361,656 |  |
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 8,058,378 | 8,428,320 |  |
Short-term investments, amortized cost | 127,588 | 200,506 |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 0 | 13,920 |  |
Short-term investments, at cost (approximates fair value) | 0 | 14,045 |  |
Other Investments | 28,117 | 18,317 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Investments, Total | 92,556 | 187,925 |  |
Cash | 9,981 | 250 |  |
Investment in subsidiaries | 737,692 | 1,150,195 |  |
Investment income due and accrued | 269 | 545 |  |
Other assets | 22,703 | 26,258 |  |
Assets | 863,201 | 1,365,173 |  |
Liabilities: |  |  |  |
Accounts payable and other liabilities | 6,294 | 3,515 |  |
Liabilities | 6,294 | 3,515 |  |
Stockholders' equity (deficit): |  |  |  |
Preferred Stock, Value, Issued | 0 | 0 |  |
Common stock | 489 | 467 |  |
Additional paid-in capital | 331,007 | 291,761 |  |
Accumulated other comprehensive income (loss) | (188,436) | (160,046) |  |
Retained earnings | 742,185 | 1,246,049 |  |
Common stock held in treasury at cost | (28,339) | (16,573) |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 856,906 | 1,361,658 | $ 1,252,331 | $ 1,038,105
Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 863,201 | 1,365,173 |  |
Short-term investments, amortized cost | 64,439 | 155,687 |  |
Short-term Investments [Member] |  |  |  |
Assets: |  |  |  |
Debt Securities, Available-for-sale | 127,601 | 200,510 |  |
Short-term investments, at cost (approximates fair value) | 127,588 | 200,506 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |
Assets: |  |  |  |
Short-term investments, at cost (approximates fair value) | $ 64,439 | $ 155,688 |  |

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