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Investments - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	1,930		1,930		2,256
Impairment loss	$ 0	$ 0	$ 523	$ 176
Other invested assets	294,931		294,931		$ 277,226
Other assets, fair value	137,100		137,100
Investment company, committed capital			43,900
Fair value of investments deposited with insurance regulatory authorities	9,400		9,400		9,200
Essent Re
Investments available for sale
Fair value of the required investments on deposit in trusts	1,000,000		1,000,000		1,100,000
Essent Guaranty
Investments available for sale
Assets on deposit for the benefit of the sponsor	$ 9,800		$ 9,800		$ 9,200
Minimum
Investments available for sale
Investment company, asset liquidation period			1 year
Maximum
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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