| Cover | Jul. 22, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 22, 2022 |
| Entity File Number | 001-37973 |
| Entity Registrant Name | NI Holdings, Inc. |
| Entity Central Index Key | 0001681206 |
| Entity Tax Identification Number | 81-2683619 |
| Entity Incorporation, State or Country Code | ND |
| Entity Address, Address Line One | 1101 First Avenue North |
| Entity Address, City or Town | Fargo |
| Entity Address, State or Province | ND |
| Entity Address, Postal Zip Code | 58102 |
| City Area Code | (701) |
| Local Phone Number | 298-4200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | NODK |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
