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Statutory Net Income, Capital and Surplus, and Dividend Restrictions (Schedule of filed with insurance regulatory) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 |  |

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- Definition Statutory unassigned surplus. + References No definition available. + Details
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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 + Details
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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 + Details
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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 + Details
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