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Subsequent Event	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event On July 30, 2019, NMIC entered into a reinsurance agreement with Oaktown Re III Ltd. (Oaktown Re III), a Bermuda domiciled special purpose reinsurer, that provides for up to $326.9 million of aggregate excess-of-loss reinsurance coverage at inception for new delinquencies on an existing portfolio of mortgage insurance policies written between June 1, 2018 and June 30, 2019. For the reinsurance coverage period, NMIC will retain the first layer of $123.4 million of aggregate losses and Oaktown Re III will then provide second layer coverage up to the outstanding reinsurance coverage amount. NMIC will then retain losses in excess of the outstanding reinsurance coverage amount. Oaktown Re III financed the coverage by issuing mortgage insurance-linked notes in an aggregate amount of $326.9 million to unaffiliated investors (the 2019 Notes). The 2019 Notes mature on July 25, 2029. All of the proceeds paid to Oaktown Re III from the sale of the 2019 Notes were deposited into a reinsurance trust to collateralize and fund the obligations of Oaktown Re III to NMIC under the reinsurance agreement. Funds in the reinsurance trust account are required to be invested in high credit quality money market funds at all times. We refer collectively to NMIC's reinsurance agreement with Oaktown Re III and the issuance of the 2019 Notes by Oaktown Re III as the 2019 ILN Transaction. Under the terms of the 2019 ILN Transaction, NMIC makes risk premium payments for the applicable outstanding reinsurance coverage amount and pays Oaktown Re III for anticipated operating expenses (capped at $250,000 per year).

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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