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Line of Credit	12 Months Ended
	Dec. 31, 2023
Line of Credit [Abstract]
Line of Credit	13. Line of Credit NI Holdings has a $3,000 line of credit with Wells Fargo Bank, N.A. The terms of the line of credit include a floating interest rate of 2.50% above the daily simple secured overnight financing rate. There were no outstanding amounts during the years ended December 31, 2023, 2022, or 2021. This line of credit is scheduled to expire on December 13, 2024.

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The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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