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Reinsurance - Excess of Loss Reinsurance Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Sep. 30, 2023
Radnor Re 2019-1 Ltd.    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Retired percent 90.00%  
Radnor Re 2020-1 Ltd.    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Retired percent 90.00%  
Reinsurance Policy, Type [Axis]: Mortgage Insurance | Other Reinsurance | Essent Guaranty    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Amortization period   10 years
Reinsurance Policy, Type [Axis]: Mortgage Insurance | VIE | Mortgage Insurance Linked Notes | Radnor Re    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Reinsurance retention policy, debt issued to cover insurance, term   10 years
Reinsurance Policy, Type [Axis]: Mortgage Insurance | VIE | Radnor Re    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Amortization period   10 years