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Statutory Accounting - Schedule of Statutory Net Income, Statutory Surplus and Contingency Reserve Liability (Details) - Affiliated Entity - Essent Guaranty - USD ($) $ in Thousands | 9 Months Ended |
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Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Dividends Restrictions |  |  |
Statutory net income | $ 361,056 | $ 377,737 |
Statutory surplus | 1,137,620 |  | $ 1,101,894
Contingency reserve liability | $ 2,594,844 |  | $ 2,492,487

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