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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Radnor Re, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 122,424,076
Remaining Risk in Force	34,004,860
Remaining Reinsurance in Force	973,915
Remaining First Layer Retention	1,375,871
OXL, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	170,152,125
Remaining Risk in Force	46,553,622
Remaining Reinsurance in Force	404,348
Remaining First Layer Retention	1,891,780
Reinsurance Policy, Type [Axis]: Vintage Year Aug 2020 - Mar 2021 | Radnor Re 2021-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	19,739,682
Remaining Risk in Force	5,468,250
Remaining Reinsurance in Force	114,739
Remaining First Layer Retention	276,517
Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Jul 2022 | Radnor Re 2022-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	25,108,189
Remaining Risk in Force	6,942,042
Remaining Reinsurance in Force	140,407
Remaining First Layer Retention	295,115
Reinsurance Policy, Type [Axis]: Vintage Year Apr 2021 - Sep 2021 | Radnor Re 2021-2 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	25,483,612
Remaining Risk in Force	7,221,803
Remaining Reinsurance in Force	209,214
Remaining First Layer Retention	273,314
Reinsurance Policy, Type [Axis]: Vintage Year August 2022- June 2023 | Radnor Re 2023-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	25,659,356
Remaining Risk in Force	7,054,365
Remaining Reinsurance in Force	227,315
Remaining First Layer Retention	274,987
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	3,917,343
Remaining Risk in Force	1,034,525
Remaining Reinsurance in Force	76,144
Remaining First Layer Retention	241,999
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Aug 2019 | XOL 2020-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,062,931
Remaining Risk in Force	1,340,666
Remaining Reinsurance in Force	29,152
Remaining First Layer Retention	210,860
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	33,592,906
Remaining Risk in Force	9,329,166
Remaining Reinsurance in Force	36,627
Remaining First Layer Retention	361,520
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	37,239,040
Remaining Risk in Force	10,243,450
Remaining Reinsurance in Force	58,005
Remaining First Layer Retention	330,808
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2025 - Dec 2025 | XOL 2025-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	33,292,085
Remaining Risk in Force	8,918,226
Remaining Reinsurance in Force	62,428
Remaining First Layer Retention	265,700
Reinsurance Policy, Type [Axis]: Vintage Year July 2023- July 2024 | Radnor Re 2024-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	26,433,237
Remaining Risk in Force	7,318,400
Remaining Reinsurance in Force	282,240
Remaining First Layer Retention	255,938
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	57,047,820
Remaining Risk in Force	15,687,589
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	$ 480,893

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