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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%