Debt Obligations	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Debt Obligations	Debt Obligations Credit Facility Essent Group and its subsidiaries, Essent Irish Intermediate Holdings Limited and Essent US Holdings, Inc. (collectively, the "Borrowers"), are parties to a secured credit facility (the “Credit Facility”) which provides for a revolving credit facility, term loans and an uncommitted line that may be exercised at the Borrowers’ option so long as the Borrowers receive commitments from the lenders. Borrowings under the Credit Facility may be used for working capital and general corporate purposes, including, without limitation, capital contributions to Essent’s insurance and reinsurance subsidiaries. Borrowings accrue interest at a floating rate tied to a standard short-term borrowing index, selected at the Company’s option, plus an applicable margin. A commitment fee is due quarterly on the average daily amount of the undrawn revolving commitment. The applicable margin and the commitment fee are based on the senior unsecured debt rating or long-term issuer rating of Essent Group to the extent available, or the insurer financial strength rating of Essent Guaranty. The current annual commitment fee rate is 0.35%. The obligations under the Credit Facility are secured by certain assets of the Borrowers, excluding the stock and assets of its insurance and reinsurance subsidiaries. The Credit Facility contains several covenants, including financial covenants relating to minimum net worth, capital and liquidity levels, maximum debt to capitalization level and Essent Guaranty's compliance with the PMIERs (see Note 12). The borrowings under the Credit Facility contractually mature on May 17, 2021. This description is not intended to be complete in all respects and is qualified in its entirety by the terms of the Credit Facility, including its covenants. On May 2, 2018, the Credit Facility was amended to increase the committed capacity by $125 million to $500 million and to increase the uncommitted line by $25 million to $100 million. The revolving component of the Credit Facility was increased from $250 million to $275 million, and the Borrowers issued $100 million of additional term loans, resulting in $225 million of term loans outstanding. The proceeds of $100 million of additional term loans were used to pay down borrowings outstanding under the revolving component of the Credit Facility. The interest rate, contractual maturity and other terms of the Credit Facility are otherwise unchanged from those described above. As of September 30, 2018, the Company was in compliance with the covenants and $225 million had been borrowed under the Credit Facility with a weighted average interest rate of 4.15%. As of December 31, 2017, $250 million had been borrowed with a weighted average interest rate of 3.49%.

Debt Obligations

Credit Facility

Essent Group and its subsidiaries, Essent Irish Intermediate Holdings Limited and Essent US Holdings, Inc. (collectively, the "Borrowers"), are parties to a secured credit facility (the “Credit Facility”) which provides for a revolving credit facility, term loans and an uncommitted line that may be exercised at the Borrowers’ option so long as the Borrowers receive commitments from the lenders. Borrowings under the Credit Facility may be used for working capital and general corporate purposes, including, without limitation, capital contributions to Essent’s insurance and reinsurance subsidiaries. Borrowings accrue interest at a floating rate tied to a standard short-term borrowing index, selected at the Company’s option, plus an applicable margin. A commitment fee is due quarterly on the average daily amount of the undrawn revolving commitment. The applicable margin and the commitment fee are based on the senior unsecured debt rating or long-term issuer rating of Essent Group to the extent available, or the insurer financial strength rating of Essent Guaranty. The current annual commitment fee rate is 0.35%. The obligations under the Credit Facility are secured by certain assets of the Borrowers, excluding the stock and assets of its insurance and reinsurance subsidiaries. The Credit Facility contains several covenants, including financial covenants relating to minimum net worth, capital and liquidity levels, maximum debt to capitalization level and Essent Guaranty's compliance with the PMIERs (see Note 12). The borrowings under the Credit Facility contractually mature on May 17, 2021. This description is not intended to be complete in all respects and is qualified in its entirety by the terms of the Credit Facility, including its covenants.

On May 2, 2018, the Credit Facility was amended to increase the committed capacity by $125 million to $500 million and to increase the uncommitted line by $25 million to $100 million. The revolving component of the Credit Facility was increased from $250 million to $275 million, and the Borrowers issued $100 million of additional term loans, resulting in $225 million of term loans outstanding. The proceeds of $100 million of additional term loans were used to pay down borrowings outstanding under the revolving component of the Credit Facility. The interest rate, contractual maturity and other terms of the Credit Facility are otherwise unchanged from those described above. As of September 30, 2018, the Company was in compliance with the covenants and $225 million had been borrowed under the Credit Facility with a weighted average interest rate of 4.15%. As of December 31, 2017, $250 million had been borrowed with a weighted average interest rate of 3.49%.