Cover Page
Cover Page | Nov. 12, 2021 | Nov. 02, 2021 |
Cover [Abstract] | ||
Document Type | 8-K | |
Document Period End Date | Nov. 12, 2021 | |
Entity Registrant Name | NMI Holdings, Inc. | |
Entity Central Index Key | 0001547903 | |
Amendment Flag | false | |
Entity Incorporation, State or Country Code | DE | |
Entity File Number | 001-36174 | |
Entity Tax Identification Number | 45-4914248 | |
Entity Address, Address Line One | 2100 Powell Street | |
Entity Address, Address Line Two | 12th Floor | |
Entity Address, City or Town | Emeryville | |
Entity Address, State or Province | CA | |
Entity Address, Postal Zip Code | 94608 | |
City Area Code | 855 | |
Local Phone Number | 530-6642 | |
Written Communications | false | |
Soliciting Material | false | |
Pre-commencement Tender Offer | false | |
Pre-commencement Issuer Tender Offer | false | |
Title of 12(b) Security | Class A Common Stock, par value $0.01 | |
Trading Symbol | NMIH | |
Security Exchange Name | NASDAQ | |
Entity Emerging Growth Company | false |