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Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
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Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  | $ 35,146 |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 89,957 | 96,732 |  |
Liability for Claims and Claims Adjustment Expense | 383,969 |  | $ 349,062 |
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables | $ 383,969 | $ 286,027 | $ 349,062 | $ 197,089

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- Definition [Line Items] for Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Table] + References No definition available. + Details
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