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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 29, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference [Text Block]

Portions of the definitive proxy statement relating to the annual meeting of shareholders to be held May 21, 2024 are incorporated by reference into Part III of this report.

    
Entity Information [Line Items]      
Entity Registrant Name NI HOLDINGS, INC.    
Entity Central Index Key 0001681206    
Entity File Number 001-37973    
Entity Tax Identification Number 81-2683619    
Entity Incorporation, State or Country Code ND    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 119
Entity Contact Personnel [Line Items]      
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    
Entity Phone Fax Numbers [Line Items]      
City Area Code (701)    
Local Phone Number 298-4200    
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol NODK    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   20,615,384