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Nature of Operations and Basis of Presentation - Narrative (Details) |  | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2025 segment state
Insurance Premium Revenue Recognition |  |
Number of reportable segments | segment |  | 1
Affiliated Entity | Essent Guaranty |  |
Insurance Premium Revenue Recognition |  |
Number of states in which the entity is licensed to write mortgage insurance | state |  | 50
Affiliated Entity | Essent PA | Reinsurance for mortgage insurance coverage in excess of 25% |  |
Insurance Premium Revenue Recognition |  |
Reinsurance for mortgage insurance coverage threshold (in excess of) | 25.00% |
Maximum |  |
Insurance Premium Revenue Recognition |  |
Residential mortgage down payment percentage for which mortgage insurance is generally required (less than) |  | 20.00%

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