Segment Information (Details) - Schedule of revenue by insurance product line - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	$ 85,474	$ 73,399
Assumed premiums earned	576	1,861
Ceded premiums earned	(8,423)	(5,673)
Net premiums earned	77,627	69,587
Direct losses and loss adjustment expenses	70,861	45,495
Assumed losses and loss adjustment expenses	90	10
Ceded losses and loss adjustment expenses	(12,126)	(5,376)
Net losses and loss adjustment expenses	58,825	40,129
Gross margin	18,802	29,458
Underwriting and general expenses	28,244	23,404
Underwriting gain (loss)	(9,442)	6,054
Fee and other income	274	428
Total	81,556	66,140
Net investment income	2,239	1,653
Net investment gains (losses)	1,416	(5,528)
Income (loss) before income taxes	(5,513)	2,607
Income tax expense (benefit)	(1,013)	568
Net income (loss)	(4,500)	2,039
Net income (loss) attributable to non-controlling interest	(290)	130
Net income (loss) attributable to NI Holdings, Inc.	$ (4,210)	$ 1,909
Operating Ratios:
Loss and loss adjustment expenses ratio	75.80%	57.70%
Expense ratio	36.40%	33.60%
Combined ratio	112.20%	91.30%
Premiums and agents’ balances receivable	$ 64,502	$ 54,880	$ 62,173
Deferred policy acquisition costs	31,350	26,272	29,768	$ 24,947
Reinsurance recoverables on losses	45,642	19,362	37,575
Receivable from Federal Crop Insurance Corporation	14,034
Goodwill and other intangibles	17,132	17,604	17,250
Unpaid losses and loss adjustment expenses	204,790	133,694	190,459
Unearned premiums	153,467	130,275	$ 148,513
Payable to Federal Crop Insurance Corporation		7,059
Private Passenger Auto [Member]
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	20,541	19,301
Assumed premiums earned
Ceded premiums earned	(888)	(559)
Net premiums earned	19,653	18,742
Direct losses and loss adjustment expenses	15,624	14,526
Assumed losses and loss adjustment expenses
Ceded losses and loss adjustment expenses	1	185
Net losses and loss adjustment expenses	15,625	14,711
Gross margin	4,028	4,031
Underwriting and general expenses	6,418	5,768
Underwriting gain (loss)	$ (2,390)	$ (1,737)
Operating Ratios:
Loss and loss adjustment expenses ratio	79.50%	78.50%
Expense ratio	32.70%	30.80%
Combined ratio	112.20%	109.30%
Premiums and agents’ balances receivable	$ 21,743	$ 19,627
Deferred policy acquisition costs	5,309	5,076
Reinsurance recoverables on losses	1,280	817
Receivable from Federal Crop Insurance Corporation
Goodwill and other intangibles
Unpaid losses and loss adjustment expenses	27,366	26,340
Unearned premiums	32,378	29,573
Payable to Federal Crop Insurance Corporation
Non-standard auto (Primero) [Member]
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	20,971	14,442
Assumed premiums earned
Ceded premiums earned	(92)	(64)
Net premiums earned	20,879	14,378
Direct losses and loss adjustment expenses	17,038	8,491
Assumed losses and loss adjustment expenses
Ceded losses and loss adjustment expenses
Net losses and loss adjustment expenses	17,038	8,491
Gross margin	3,841	5,887
Underwriting and general expenses	8,994	6,091
Underwriting gain (loss)	(5,153)	(204)
Fee and other income	232	388
Total	$ (4,921)	$ 184
Operating Ratios:
Loss and loss adjustment expenses ratio	81.60%	59.10%
Expense ratio	43.10%	42.40%
Combined ratio	124.70%	101.40%
Premiums and agents’ balances receivable	$ 16,642	$ 12,098
Deferred policy acquisition costs	10,716	7,126
Reinsurance recoverables on losses
Receivable from Federal Crop Insurance Corporation
Goodwill and other intangibles	2,748	2,798
Unpaid losses and loss adjustment expenses	50,876	41,948
Unearned premiums	33,711	20,933
Payable to Federal Crop Insurance Corporation
Home and Farm [Member]
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	22,433	21,179
Assumed premiums earned
Ceded premiums earned	(2,442)	(1,967)
Net premiums earned	19,991	19,212
Direct losses and loss adjustment expenses	9,523	7,192
Assumed losses and loss adjustment expenses
Ceded losses and loss adjustment expenses	(804)	(352)
Net losses and loss adjustment expenses	8,719	6,840
Gross margin	11,272	12,372
Underwriting and general expenses	6,205	5,973
Underwriting gain (loss)	$ 5,067	$ 6,399
Operating Ratios:
Loss and loss adjustment expenses ratio	43.60%	35.60%
Expense ratio	31.10%	31.10%
Combined ratio	74.70%	66.70%
Premiums and agents’ balances receivable	$ 8,954	$ 8,991
Deferred policy acquisition costs	7,279	7,246
Reinsurance recoverables on losses	5,845	3,559
Receivable from Federal Crop Insurance Corporation
Goodwill and other intangibles
Unpaid losses and loss adjustment expenses	29,165	17,130
Unearned premiums	44,446	42,307
Payable to Federal Crop Insurance Corporation
Crop [Member]
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	(10)	(17)
Ceded premiums earned	(715)	4
Net premiums earned	(725)	(13)
Direct losses and loss adjustment expenses	(669)	(103)
Ceded losses and loss adjustment expenses	(104)	(63)
Net losses and loss adjustment expenses	(773)	(166)
Gross margin	48	153
Underwriting and general expenses	32	(552)
Underwriting gain (loss)	$ 16	$ 705
Operating Ratios:
Loss and loss adjustment expenses ratio
Expense ratio
Combined ratio
Premiums and agents’ balances receivable	$ 93
Deferred policy acquisition costs
Reinsurance recoverables on losses	51	$ 75
Receivable from Federal Crop Insurance Corporation	14,034
Goodwill and other intangibles
Unpaid losses and loss adjustment expenses	421	421
Unearned premiums
Payable to Federal Crop Insurance Corporation		7,059
Commercial [Member]
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	20,230	17,230
Assumed premiums earned
Ceded premiums earned	(4,213)	(3,042)
Net premiums earned	16,017	14,188
Direct losses and loss adjustment expenses	29,322	15,063
Assumed losses and loss adjustment expenses
Ceded losses and loss adjustment expenses	(11,208)	(5,046)
Net losses and loss adjustment expenses	18,114	10,017
Gross margin	(2,097)	4,171
Underwriting and general expenses	6,086	5,336
Underwriting gain (loss)	$ (8,183)	$ (1,165)
Operating Ratios:
Loss and loss adjustment expenses ratio	113.10%	70.60%
Expense ratio	38.00%	37.60%
Combined ratio	151.10%	108.20%
Premiums and agents’ balances receivable	$ 16,301	$ 13,442
Deferred policy acquisition costs	7,616	6,392
Reinsurance recoverables on losses	37,669	14,184
Receivable from Federal Crop Insurance Corporation
Goodwill and other intangibles	14,384	14,806
Unpaid losses and loss adjustment expenses	89,296	38,640
Unearned premiums	39,975	34,181
Payable to Federal Crop Insurance Corporation
All Other [Member]
Segment Information (Details) - Schedule of revenue by insurance product line [Line Items]
Direct premiums earned	1,309	1,264
Assumed premiums earned	576	1,861
Ceded premiums earned	(73)	(45)
Net premiums earned	1,812	3,080
Direct losses and loss adjustment expenses	23	326
Assumed losses and loss adjustment expenses	90	10
Ceded losses and loss adjustment expenses	(11)	(100)
Net losses and loss adjustment expenses	102	236
Gross margin	1,710	2,844
Underwriting and general expenses	509	788
Underwriting gain (loss)	$ 1,201	$ 2,056
Operating Ratios:
Loss and loss adjustment expenses ratio	5.60%	7.70%
Expense ratio	28.10%	25.60%
Combined ratio	33.70%	33.20%
Premiums and agents’ balances receivable	$ 769	$ 722
Deferred policy acquisition costs	430	432
Reinsurance recoverables on losses	797	727
Receivable from Federal Crop Insurance Corporation
Goodwill and other intangibles
Unpaid losses and loss adjustment expenses	7,666	9,215
Unearned premiums	$ 2,957	3,281
Payable to Federal Crop Insurance Corporation