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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 217,903,467
Remaining Risk in Force	57,552,815
Remaining Reinsurance in Force	2,460,819
Remaining First Layer Retention	2,028,750
ILN
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	2,110,608
Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	350,211
Reinsurance Policy, Type [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,931,479
Remaining Risk in Force	1,610,997
Remaining Reinsurance in Force	41,764
Remaining First Layer Retention	206,843
Reinsurance Policy, Type [Axis]: Vintage Year 2015 And 2016 | Radnor Re 2019-2 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	41,764
Reinsurance Policy, Type [Axis]: Vintage Year 2015 And 2016 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,810,456
Remaining Risk in Force	1,527,469
Remaining Reinsurance in Force	311,189
Remaining First Layer Retention	216,143
Reinsurance Policy, Type [Axis]: Vintage Year 2017 | Radnor Re 2018-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	225,562
Reinsurance Policy, Type [Axis]: Vintage Year 2017 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	85,627
Reinsurance Policy, Type [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,620,816
Remaining Risk in Force	1,708,129
Remaining Reinsurance in Force	401,681
Remaining First Layer Retention	248,675
Reinsurance Policy, Type [Axis]: Vintage Year 2018 | Radnor Re 2019-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	325,537
Reinsurance Policy, Type [Axis]: Vintage Year 2018 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	76,144
Reinsurance Policy, Type [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	8,185,651
Remaining Risk in Force	2,108,121
Remaining Reinsurance in Force	464,454
Remaining First Layer Retention	214,708
Reinsurance Policy, Type [Axis]: Vintage Year 2019 | Radnor Re 2020-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	418,006
Reinsurance Policy, Type [Axis]: Vintage Year 2019 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	46,448
Reinsurance Policy, Type [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	40,676,403
Remaining Risk in Force	10,206,068
Remaining Reinsurance in Force	451,093
Remaining First Layer Retention	278,919
Reinsurance Policy, Type [Axis]: Vintage Year 2020 And 2021 | Radnor Re 2021-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	451,093
Reinsurance Policy, Type [Axis]: Vintage Year 2020 And 2021 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	41,455,845
Remaining Risk in Force	11,027,751
Remaining Reinsurance in Force	410,778
Remaining First Layer Retention	279,400
Reinsurance Policy, Type [Axis]: Vintage Year 2021 | Radnor Re 2021-2 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	410,778
Reinsurance Policy, Type [Axis]: Vintage Year 2021 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through December 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	75,406,975
Remaining Risk in Force	20,284,551
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	507,114
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through July 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	33,815,842
Remaining Risk in Force	9,079,729
Remaining Reinsurance in Force	237,868
Remaining First Layer Retention	303,761
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Radnor Re 2021-2 Ltd. | Written From October 1 Through December 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Radnor Re 2021-2 Ltd. | Written From October 1 Through July 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	237,868
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Other Reinsurance | Written From October 1 Through December 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	141,992
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Other Reinsurance | Written From October 1 Through July 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	$ 0

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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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