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Nature of Operations and Basis of Presentation (Details) |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2021 | Dec. 31, 2020 | Mar. 31, 2019 | Mar. 31, 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 Re | Quota share reinsurance |  |  |  |
Insurance Premium Revenue Recognition |  |  |  |
Reinsurance percentage | 35.00% | 25.00% |  |
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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- Definition Percentage of risk undertaken originally by insurer ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
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