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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Loss Carryforwards [Line Items] |  |  |
Net purchases of T&L Bonds | $ 52,186,000 | $ 57,650,000 | $ 58,174,000
Prepaid federal income tax | 470,646,000 | 418,460,000 |
Deferred tax assets, investments | 2,700,000 |  |
Unrecognized tax benefits | 0 | 0 |
U.S. |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Taxes provided on un-remitted earnings | 0 |  |
Cumulative amount of earnings that would be subject to withholding tax, if distributed outside of the U.S. | 4,000,000,000 |  |
Essent Holdings | Essent Irish Intermediate |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Withholding taxes accrued with respect to un-remitted earnings | 0 |  |
Bermuda | Bermuda |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income before income taxes | 268,800,000 | 282,500,000 | 217,300,000
U.S. | US |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income before income taxes | 554,200,000 | $ 705,600,000 | $ 605,000,000
United States Ireland Tax Treaty Benefits Availed | U.S. |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Associated withholding tax liability on cumulative amount of earnings that would be subject to withholding tax, if distributed outside of the U.S. | $ 197,900,000 |  |
United States Ireland Tax Treaty Benefits Availed | Essent Holdings | Essent Irish Intermediate |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Withholding tax rate on dividends paid | 5.00% |  |
Absent Benefits Of United States Ireland Tax Treaty | Essent Holdings | Essent Irish Intermediate |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Withholding tax rate on dividends paid | 30.00% |  |

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- Definition Represents, for a mortgage guaranty insurer, the increase (decrease) during the reporting period in the amount of investment in United States Mortgage Guaranty Tax and Loss Bonds issued by the Treasury Department for eligibility for certain tax deductions under enacted tax laws. + References No definition available. + Details
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