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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Radnor Re, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 120,056,819
Remaining Risk in Force	32,597,334
Remaining Reinsurance in Force	1,042,618
Remaining First Layer Retention	1,139,463
Radnor Re 2021-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Aug 2020 - Mar 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	27,796,132
Remaining Risk in Force	7,390,779
Remaining Reinsurance in Force	250,732
Remaining First Layer Retention	278,227
Radnor Re 2021-2 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Apr 2021 - Sep 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	32,876,424
Remaining Risk in Force	9,007,485
Remaining Reinsurance in Force	301,015
Remaining First Layer Retention	277,770
Radnor Re 2022-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Jul 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	29,790,115
Remaining Risk in Force	8,096,398
Remaining Reinsurance in Force	209,409
Remaining First Layer Retention	302,032
Radnor Re 2023-1 | Reinsurance Policy, Type [Axis]: Vintage August 2022- June 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	29,594,148
Remaining Risk in Force	8,102,672
Remaining Reinsurance in Force	281,462
Remaining First Layer Retention	281,434
OXL, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	117,662,525
Remaining Risk in Force	32,062,992
Remaining Reinsurance in Force	287,533
Remaining First Layer Retention	1,326,490
XOL 2019-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2018 - Dec 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,024,587
Remaining Risk in Force	1,321,732
Remaining Reinsurance in Force	76,144
Remaining First Layer Retention	244,991
XOL 2020-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Aug 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,290,687
Remaining Risk in Force	1,658,671
Remaining Reinsurance in Force	32,770
Remaining First Layer Retention	212,557
XOL 2022-1 | Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Dec 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	67,094,902
Remaining Risk in Force	18,213,963
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	502,788
XOL 2023-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2023 - Dec 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	39,252,349
Remaining Risk in Force	10,868,626
Remaining Reinsurance in Force	36,627
Remaining First Layer Retention	$ 366,154

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