Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ 256	$ 117	$ 6,408	$ 4,866
Other comprehensive income (loss), before income taxes:
Holding gains (losses) on investments	733	2,995	(3,268)	3,711
Reclassification adjustment for net realized capital loss (gain) included in net income	(250)	(339)	(719)	(955)
Other comprehensive income (loss), before income taxes	483	2,656	(3,987)	2,756
Income tax benefit (expense) related to items of other comprehensive income	(101)	(929)	837	(964)
Other comprehensive income (loss), net of income taxes	382	1,727	(3,150)	1,792
Comprehensive income (loss)	638	1,844	3,258	6,658
Attributable to Non-Controlling Interest [Member]
Net income (loss)	30	(12)	60	48
Other comprehensive income (loss), before income taxes:
Holding gains (losses) on investments	(24)	40	(106)	14
Reclassification adjustment for net realized capital loss (gain) included in net income		27		27
Other comprehensive income (loss), before income taxes	(24)	67	(106)	41
Income tax benefit (expense) related to items of other comprehensive income	5	(23)	22	(14)
Other comprehensive income (loss), net of income taxes	(19)	44	(84)	27
Comprehensive income (loss)	11	32	(24)	75
Attributable to NI Holdings, [Member]
Net income (loss)	226	129	6,348	4,818
Other comprehensive income (loss), before income taxes:
Holding gains (losses) on investments	757	2,955	(3,162)	3,697
Reclassification adjustment for net realized capital loss (gain) included in net income	(250)	(366)	(719)	(982)
Other comprehensive income (loss), before income taxes	507	2,589	(3,881)	2,715
Income tax benefit (expense) related to items of other comprehensive income	(106)	(906)	815	(950)
Other comprehensive income (loss), net of income taxes	401	1,683	(3,066)	1,765
Comprehensive income (loss)	$ 627	$ 1,812	$ 3,282	$ 6,583