Statutory Net Income, Capital and Surplus, and Dividend Restrictions (Schedule of filed with insurance regulatory) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Nodak Insurance [Member]
Statutory capital and surplus		$ 221,761	$ 216,278	$ 189,836
Statutory unassigned surplus		216,761	211,278	184,836
Statutory net income		5,311	24,529	9,398
Dividend distribution amount from subsidiaries
Payment of dividends		21,493
American West [Member]
Statutory capital and surplus		18,400	18,368	16,168
Statutory unassigned surplus		12,399	12,367	10,167
Statutory net income		(54)	2,158	2,232
American West [Member] \| Forecast [Member]
Dividend distribution amount from subsidiaries	$ 1,840
Primero [Member]
Statutory capital and surplus		10,138	9,818	8,727
Statutory unassigned surplus		879	559	(532)
Statutory net income		127	1,023	(1,256)
Primero [Member] \| Forecast [Member]
Dividend distribution amount from subsidiaries	$ 0
Battle Creek [Member]
Statutory capital and surplus		6,821	6,875	6,189
Statutory unassigned surplus		3,821	3,875	3,189
Statutory net income		(77)	693	133
Direct Auto [Member]
Statutory capital and surplus		37,960	35,819	28,683
Statutory unassigned surplus		34,960	32,819	25,683
Statutory net income		6,451	7,898	7,377
Payment of dividends		3,796
Westminster [Member]
Statutory capital and surplus		24,706	23,592	20,897
Statutory unassigned surplus		19,706	18,592	15,897
Statutory net income		1,723	$ 2,719	$ 225
NI Holdings [Member]
Payment of dividends		6,000
Westminster Insurance Company [Member]
Payment of dividends		$ 2,471

Statutory unassigned surplus.

No definition available.

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- Definition

Amount of statutory capital and surplus computed using prescribed or permitted statutory accounting practice.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ References

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