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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, investments $ 5,300,000    
Net purchases of T&L Bonds 18,954,000 $ 52,186,000 $ 57,650,000
Prepaid federal income tax 489,600,000 470,646,000  
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. 4,500,000,000    
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 277,000,000.0 268,800,000 282,500,000
U.S. | US      
Operating Loss Carryforwards [Line Items]      
Income before income taxes 578,500,000 $ 554,200,000 $ 705,600,000
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. $ 226,800,000    
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%