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Investments - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Number of investment securities in unrealized loss position | security 2,481 2,256  
Impairment loss $ 523 $ 177 $ 12,728
Other invested assets 303,900 277,226  
Fair value of investments deposited with insurance regulatory authorities to meet statutory requirements 9,300 9,200  
Essent Re      
Debt Securities, Available-for-sale [Line Items]      
Fair value of the required investments on deposit in trusts 983,500 1,060,000  
Essent Guaranty      
Debt Securities, Available-for-sale [Line Items]      
Assets on deposit for the benefit of the sponsor 9,300 $ 9,200  
Limited Partnership Investment      
Debt Securities, Available-for-sale [Line Items]      
Other assets, fair value 171,700    
Investment company, committed capital $ 45,100    
Limited Partnership Investment | Minimum      
Debt Securities, Available-for-sale [Line Items]      
Investment company, asset liquidation period 2 years    
Limited Partnership Investment | Maximum      
Debt Securities, Available-for-sale [Line Items]      
Investment company, asset liquidation period 9 years    
Securities | Credit Concentration Risk | Internal Investment Grade      
Debt Securities, Available-for-sale [Line Items]      
Concentration risk, percentage 98.00%