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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 154,332,572
Remaining Risk in Force	39,485,795
Remaining Reinsurance in Force	2,595,791
Remaining First Layer Retention	1,912,507
2015 & 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,994,097
Remaining Risk in Force	2,161,454
Remaining Reinsurance in Force	135,785
Remaining First Layer Retention	207,023
2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,329,533
Remaining Risk in Force	1,908,895
Remaining Reinsurance in Force	407,290
Remaining First Layer Retention	217,185
2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	8,233,272
Remaining Risk in Force	2,104,668
Remaining Reinsurance in Force	401,681
Remaining First Layer Retention	249,213
2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	9,954,519
Remaining Risk in Force	2,549,289
Remaining Reinsurance in Force	550,991
Remaining First Layer Retention	215,054
2019 and 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	28,615,471
Remaining Risk in Force	7,271,864
Remaining Reinsurance in Force	102,726
Remaining First Layer Retention	465,681
2020 and 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	47,520,573
Remaining Risk in Force	11,699,693
Remaining Reinsurance in Force	557,911
Remaining First Layer Retention	278,936
2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	44,685,107
Remaining Risk in Force	11,789,932
Remaining Reinsurance in Force	439,407
Remaining First Layer Retention	279,415
ILN 2015 & 2016 | 2015 & 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	135,785
Radnor Re 2018-1 Ltd. | 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	242,123
Radnor Re 2019-1 Ltd. | 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	325,537
Radnor Re 2020-1 Ltd. | 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	495,889
Radnor Re 2020-2 Ltd. | 2019 and 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	102,726
Radnor Re 2021-1 Ltd. | 2020 and 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	557,911
Radnor Re 2021-2 Ltd. | 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	439,407
ILN
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	2,299,378
Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	296,413
Other Reinsurance | 2015 & 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	165,167
Other Reinsurance | 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	76,144
Other Reinsurance | 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	55,102
Other Reinsurance | 2019 and 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | 2020 and 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	$ 0

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