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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Radnor Re, Total  
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]  
Remaining Insurance in Force $ 125,224,867
Remaining Risk in Force 33,811,076
Total VIE Assets 1,104,718
Remaining First Layer Retention 1,141,480
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 29,772,296
Remaining Risk in Force 7,817,502
Total VIE Assets 280,941
Remaining First Layer Retention 278,416
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 34,555,672
Remaining Risk in Force 9,408,534
Total VIE Assets 322,709
Remaining First Layer Retention 278,709
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 30,751,105
Remaining Risk in Force 8,334,892
Total VIE Assets 219,606
Remaining First Layer Retention 302,892
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 30,145,794
Remaining Risk in Force 8,250,148
Remaining First Layer Retention 281,462
OXL, Total  
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]  
Remaining Insurance in Force 120,787,598
Remaining Risk in Force 32,861,983
Total VIE Assets 289,787
Remaining First Layer Retention 1,329,698
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 5,274,449
Remaining Risk in Force 1,385,510
Total VIE Assets 76,144
Remaining First Layer Retention 245,590
XOL 2020-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Dec 2019  
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]  
Remaining Insurance in Force 6,574,279
Remaining Risk in Force 1,728,344
Total VIE Assets 35,024
Remaining First Layer Retention 212,934
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 68,954,857
Remaining Risk in Force 18,681,548
Total VIE Assets 141,992
Remaining First Layer Retention 504,904
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 39,984,013
Remaining Risk in Force 11,066,581
Total VIE Assets 36,627
Remaining First Layer Retention $ 366,270