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Investments - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	2,624		2,624		2,578
Impairment loss	$ 0	$ 105	$ 176	$ 7,411
Other invested assets	272,619		272,619		$ 257,941
Fair value of investments deposited with insurance regulatory authorities	9,400		9,400		9,100
Essent Re
Investments available for sale
Fair value of the required investments on deposit in trusts	1,000,000		1,000,000		972,400
Essent Guaranty
Investments available for sale
Assets on deposit under reinsurance agreement	5,000		5,000		8,600
Assets on deposit for the benefit of the sponsor	9,000		9,000		$ 9,100
Limited Partnership Investments
Investments available for sale
Other assets, fair value	$ 137,400		137,400
Funding commitments			$ 49,000
Limited Partnership Investments | Minimum
Investments available for sale
Asset liquidation period			1 year
Limited Partnership Investments | Maximum
Investments available for sale
Asset liquidation period			9 years
Securities | Credit Concentration Risk | Internal Investment Grade
Investments available for sale
Concentration risk, percentage			98.00%

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