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Reinsurance - Schedule of Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	$ 1,229,957
Radnor Re, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	138,548,464
Remaining Risk in Force	38,115,471
Remaining Reinsurance in Force	1,229,957
Remaining First Layer Retention	1,390,998
OXL
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	150,383,983
Remaining Risk in Force	41,162,312
Remaining Reinsurance in Force	341,920
Remaining First Layer Retention	1,649,730
Reinsurance Policy, Type [Axis]: Vintage August 2022- June 2023 | Radnor Re 2023-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	28,058,061
Remaining Risk in Force	7,690,718
Remaining First Layer Retention	280,559
Reinsurance Policy, Type [Axis]: Vintage July 2023- July 2024 | Radnor Re 2024-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	29,033,466
Remaining Risk in Force	8,025,937
Remaining First Layer Retention	256,495
Reinsurance Policy, Type [Axis]: Vintage Year Aug 2020 - Mar 2021 | Radnor Re 2021-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	23,839,935
Remaining Risk in Force	6,533,211
Remaining Reinsurance in Force	190,062
Remaining First Layer Retention	277,698
Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Jul 2022 | Radnor Re 2022-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	27,859,437
Remaining Risk in Force	7,621,952
Remaining Reinsurance in Force	175,026
Remaining First Layer Retention	300,105
Reinsurance Policy, Type [Axis]: Vintage Year Apr 2021 - Sep 2021 | Radnor Re 2021-2
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	29,757,565
Remaining Risk in Force	8,243,653
Remaining Reinsurance in Force	265,134
Remaining First Layer Retention	276,141
Reinsurance Policy, Type [Axis]: Vintage Year August 2022- June 2023 | Radnor Re 2023-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	268,320
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2018 - Dec 2018 | XOL 2019-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	4,535,941
Remaining Risk in Force	1,195,244
Remaining Reinsurance in Force	76,144
Remaining First Layer Retention	243,704
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Dec 2019 | XOL 2020-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,760,682
Remaining Risk in Force	1,522,699
Remaining Reinsurance in Force	29,152
Remaining First Layer Retention	211,678
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2023 - Dec 2023 | XOL 2023-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	36,841,903
Remaining Risk in Force	10,211,722
Remaining Reinsurance in Force	36,627
Remaining First Layer Retention	366,028
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2024 - Dec 2024 | XOL 2024-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	40,244,132
Remaining Risk in Force	11,048,540
Remaining Reinsurance in Force	58,005
Remaining First Layer Retention	331,456
Reinsurance Policy, Type [Axis]: Vintage Year July 2023- July 2024 | Radnor Re 2024-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	331,415
Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Dec 2022 | XOL 2022-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	63,001,325
Remaining Risk in Force	17,184,107
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	$ 496,864

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Amount per life of risk undertaken originally by insurer that is not ceded to reinsurer.

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