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Investments - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) security	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	1,994		1,180
Impairment loss	$ (6,837,000)	$ 0
Other invested assets	212,521,000		$ 170,472,000
Income from other invested assets	24,705,000	$ 526,000
Fair value of investments deposited with insurance regulatory authorities	9,300,000		9,700,000
Essent Re
Investments available for sale
Fair value of the required investments on deposit in trusts	985,700,000		982,600,000
Essent Guaranty
Investments available for sale
Assets on deposit under reinsurance agreement	8,500,000		8,500,000
Assets on deposit for the benefit of the sponsor	9,000,000		$ 9,000,000
Limited Partnership Investments
Investments available for sale
Income from other invested assets	15,000,000
Other assets, fair value	$ 105,800,000
Percent of investments	56.00%
Funding commitments	$ 8,300,000
Limited Partnership Investments | Minimum
Investments available for sale
Asset liquidation period	3 years
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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