Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income (loss)	$ 117	$ (1,819)	$ 4,866	$ 4,400
Other comprehensive income, before income taxes:
Holding gains on investments	2,995	2,283	3,711	5,621
Reclassification adjustment for net realized capital loss (gain) included in net income	(339)	(130)	(955)	(219)
Other comprehensive income, before income taxes	2,656	2,153	2,756	5,402
Income tax expense related to items of other comprehensive income	(929)	(754)	(964)	(1,891)
Other comprehensive income, net of income taxes	1,727	1,399	1,792	3,511
Comprehensive income	1,844	(420)	6,658	7,911
Attributable to Non-Controlling Interest [Member]
Net income (loss)	(12)	(57)	48	(52)
Other comprehensive income, before income taxes:
Holding gains on investments	40	61	14	139
Reclassification adjustment for net realized capital loss (gain) included in net income	27	(10)	27	10
Other comprehensive income, before income taxes	67	51	41	149
Income tax expense related to items of other comprehensive income	(23)	(18)	(14)	(52)
Other comprehensive income, net of income taxes	44	33	27	97
Comprehensive income	32	(24)	75	45
Attributable to NI Holdings, [Member]
Net income (loss)	129	(1,762)	4,818	4,452
Other comprehensive income, before income taxes:
Holding gains on investments	2,955	2,222	3,697	5,482
Reclassification adjustment for net realized capital loss (gain) included in net income	(366)	(120)	(982)	(229)
Other comprehensive income, before income taxes	2,589	2,102	2,715	5,253
Income tax expense related to items of other comprehensive income	(906)	(736)	(950)	(1,839)
Other comprehensive income, net of income taxes	1,683	1,366	1,765	3,414
Comprehensive income	$ 1,812	$ (396)	$ 6,583	$ 7,866