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Investments - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) security	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) security	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	2,178		2,178		2,481
Impairment loss	$ 0	$ (523)	$ 0	$ (523)
Other invested assets	359,823		359,823		$ 303,900
Fair value of investments deposited with insurance regulatory authorities	8,700		8,700		9,300
Limited Partnership Investment
Investments available for sale
Other assets, fair value	179,700		179,700		171,700
Investment company, committed capital			44,000
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
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%

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