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Consolidated Balance Sheets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets:          
Debt Securities, Available-for-Sale $ 426,926 $ 426,926      
Total investments (net of allowance for credit losses of $0 and $0) 455,228 455,228   $ 312,915  
Restricted Cash 24,247 24,247   17,669  
Premiums Receivable, Net 74,760 74,760   57,222  
Premium Receivable, Allowance for Credit Loss 200 200   142  
Reinsurance Recoverables, Including Reinsurance Premium Paid 440,462 440,462   306,191  
Deferred ceded premium 160,906 160,906   148,300  
Intangible assets, less accumulated amortization 339,197 339,197   344,775  
Goodwill 445,382 445,382   418,234 $ 69,694
Other Assets 95,424 95,424   92,317  
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale 0 0      
Total assets 2,147,890 2,147,890   8,058,378  
Liabilities:          
Unearned premiums 197,133 197,133   182,446  
Liability for Claims and Claims Adjustment Expense 437,539 437,539   349,062  
Ceded premiums payable 87,635 87,635   53,002  
Accrued interest payable 0 0   2,560  
Derivative Liability 0 0   317  
Other liabilities 92,226 92,226   89,036  
Total liabilities 1,000,469 1,000,469   6,862,857  
Redeemable Noncontrolling Interest, Equity, Redemption Value 188,247 188,247      
Redeemable Noncontrolling Interest, Equity, Carrying Amount 188,247 188,247   140,860 17,079
Liabilities 1,000,469 1,000,469   6,862,857  
Stockholders’ equity:          
Preferred stock, par value $0.01 per share; 20,000,000 shares authorized; issued and outstanding shares—none 0 0   0  
Common Stock, Value, Issued 489 489   489  
Additional paid-in capital 367,077 367,077   331,007  
Accumulated other comprehensive income 11,780 11,780   (188,436) (160,046)
Retained earnings 491,733 491,733   742,185  
Treasury stock, shares at cost: 0 and 8,202 (27,695) (27,695)   (28,339)  
Total Ambac Financial Group, Inc. stockholders’ equity 843,384 843,384   856,906  
Noncontrolling interest 115,790 115,790   197,755  
Total stockholders’ equity 959,174 959,174   1,054,661 1,414,615
Total liabilities and stockholders’ equity 2,147,890 2,147,890   8,058,378  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0   0  
Debt Securities, Available-for-sale, Amortized Cost 428,432 428,432   289,712  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 51,767 51,767   47,275 $ 19,223
Deferred Policy Acquisition Cost 9,284 9,284   8,572  
Capitalized Contract Cost, Net 7,754 7,754   7,500  
Deferred Income Tax Liabilities, Net $ 68,865 $ 68,865   $ 70,135  
Treasury Stock, Common, Shares 2,175,418 2,175,418   2,368,194  
Preferred Stock, Shares Issued 0 0   0  
Short-Term Debt $ 0 $ 0   $ 150,000  
Receivables, Net, Current 75,480 75,480 $ 55,377    
Reinsurance Recoverable, Allowance for Credit Loss 100 100   100  
Disposal Group, Including Discontinued Operation, Assets     6,267,200    
Accrued Liabilities for Commissions, Expense and Taxes 109,317 109,317 71,431    
Disposal Group, Including Discontinued Operation, Liabilities 0 0 $ 5,887,685    
Allowance for Credit Loss, Receivable, Other, Current 238 238   238  
Afg [Member]          
Stockholders’ equity:          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 51,767 51,767   47,275  
Short-term Investments [Member]          
Assets:          
Debt Securities, Available-for-Sale 295,825 295,825   127,601  
Stockholders’ equity:          
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0   0  
Debt Securities, Available-for-sale, Amortized Cost 295,815 295,815   127,588  
Fixed Income Securities [Member]          
Assets:          
Debt Securities, Available-for-Sale 131,101 131,101   157,020  
Stockholders’ equity:          
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0   0  
Debt Securities, Available-for-sale, Amortized Cost 132,617 132,617   162,124  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 131,101 131,101   157,020  
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 132,617 132,617   162,124  
Short-term Investments [Member]          
Assets:          
Debt Securities, Available-for-Sale 295,825 295,825   127,601  
Stockholders’ equity:          
Gross Investment Income, Operating 1,344 3,991      
Other Investments [Member]          
Stockholders’ equity:          
Other Investment Not Readily Marketable, Fair Value 28,302 28,302   $ 28,294  
Gross Investment Income, Operating $ 199 $ 120