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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 193,378,131
Remaining Risk in Force	50,236,357
Remaining Reinsurance in Force	2,563,832
Remaining First Layer Retention	2,231,977
Reinsurance Contract [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,103,695
Remaining Risk in Force	1,923,750
Remaining Reinsurance in Force	92,252
Remaining First Layer Retention	206,949
Reinsurance Contract [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,635,437
Remaining Risk in Force	1,737,626
Remaining Reinsurance in Force	405,412
Remaining First Layer Retention	216,924
Reinsurance Contract [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,501,596
Remaining Risk in Force	1,923,568
Remaining Reinsurance in Force	401,681
Remaining First Layer Retention	249,142
Reinsurance Contract [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	9,163,963
Remaining Risk in Force	2,349,594
Remaining Reinsurance in Force	550,991
Remaining First Layer Retention	214,983
Reinsurance Contract [Axis]: Vintage Year 2019 And 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	26,585,463
Remaining Risk in Force	6,789,598
Remaining Reinsurance in Force	64,499
Remaining First Layer Retention	465,676
Reinsurance Contract [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	45,196,322
Remaining Risk in Force	11,204,778
Remaining Reinsurance in Force	519,999
Remaining First Layer Retention	278,919
Reinsurance Contract [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	43,511,188
Remaining Risk in Force	11,508,673
Remaining Reinsurance in Force	439,407
Remaining First Layer Retention	279,415
Reinsurance Contract [Axis]: Vintage Year 2021 And 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	47,680,467
Remaining Risk in Force	12,798,770
Remaining Reinsurance in Force	89,591
Remaining First Layer Retention	319,969
ILN 2015 & 2016 | Reinsurance Contract [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	92,252
Radnor Re 2018-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	242,123
Radnor Re 2019-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	325,537
Radnor Re 2020-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	495,889
Radnor Re 2020-2 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2019 And 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	64,499
Radnor Re 2021-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	519,999
Radnor Re 2021-2 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	439,407
Radnor Re 2021-2 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2021 And 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
ILN
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	2,179,706
Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	384,126
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	163,289
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	76,144
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	55,102
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2019 And 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2021 And 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	$ 89,591

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387

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