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Investments - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Investments available for sale          
Number of investment securities in an unrealized loss position | security 1,807   1,807   2,481
Impairment loss (less than for three and nine months ended September 30, 2025) $ (40) $ 0 $ (40) $ (523)  
Other invested assets 370,072   370,072   $ 303,900
Fair value of investments deposited with insurance regulatory authorities 8,700   8,700   9,300
Essent Re          
Investments available for sale          
Fair value of the required investments on deposit in trusts 1,000,000   1,000,000   983,500
Essent Guaranty          
Investments available for sale          
Assets on deposit for the benefit of the sponsor 5,100   5,100   9,300
Limited Partnership Investment          
Investments available for sale          
Other assets, fair value $ 178,100   178,100   $ 171,700
Investment company, committed capital     $ 42,500    
Minimum | Limited Partnership Investment          
Investments available for sale          
Investment company, asset liquidation period     1 year    
Maximum | Limited Partnership Investment          
Investments available for sale          
Investment company, asset liquidation period     9 years    
Securities | Credit Concentration Risk | Internal Investment Grade          
Investments available for sale          
Concentration risk, percentage     99.00%