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Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
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Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  | $ 56,190 |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 45,601 | 45,778 |  |
Liability for Claims and Claims Adjustment Expense | 487,261 |  | $ 459,990 |
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables | $ 487,261 | $ 373,105 | $ 459,990 | $ 349,062

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- Definition Ceded Loss And Loss Expenses Paid Not Yet Recovered + References No definition available. + Details
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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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