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Investments - Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) security	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	2,526		2,578
Impairment loss	$ 0	$ 6,837,000
Other invested assets	255,288,000		$ 257,941,000
Fair value of investments deposited with insurance regulatory authorities	9,200,000		9,100,000
Essent Re
Investments available for sale
Fair value of the required investments on deposit in trusts	671,800,000		972,400,000
Essent Guaranty
Investments available for sale
Assets on deposit under reinsurance agreement	8,700,000		8,600,000
Assets on deposit for the benefit of the sponsor	9,100,000		$ 9,100,000
Limited Partnership Investments
Investments available for sale
Other assets, fair value	163,100,000
Funding commitments	$ 49,000,000
Limited Partnership Investments | Minimum
Investments available for sale
Asset liquidation period	1 year
Limited Partnership Investments | Maximum
Investments available for sale
Asset liquidation period	8 years
Securities | Credit Concentration Risk | Internal Investment Grade
Investments available for sale
Concentration risk, percentage	98.00%

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