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Investments - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) security	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) security	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	2,465		2,465		1,180
Impairment	$ 469	$ 0	$ 7,306	$ 0
Impairment loss		0		0
Other invested assets	217,757		217,757		$ 170,472
Income from other invested assets	1,953	$ 122	26,658	$ 648
Fair value of investments deposited with insurance regulatory authorities	9,300		9,300		9,700
Essent Re
Investments available for sale
Fair value of the required investments on deposit in trusts	1,000,000		1,000,000		982,600
Essent Guaranty
Investments available for sale
Assets on deposit under reinsurance agreement	8,500		8,500		8,500
Assets on deposit for the benefit of the sponsor	9,000		9,000		$ 9,000
Limited Partnership Investments
Investments available for sale
Income from other invested assets	2,400		12,600
Other assets, fair value	$ 134,500		134,500
Funding commitments			$ 28,600
Limited Partnership Investments | Minimum
Investments available for sale
Asset liquidation period			2 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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