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Statutory Accounting and Regulation - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statutory Accounting Practices |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 370,720 | $ 415,948 |
Statutory Accounting Practices, Statutory Net Income Amount | (28,326) | $ (38,507) | $ (5,199)
UPC, Subsidiary |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | 142,399 |  |
American Coastal Insurance Company |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | 81,179 |  |
Family Security Holdings (FSH) |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | 40,635 |  |
Interboro Insurance Company |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | 34,214 |  |
Journey Insurance Company |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | $ 60,128 |  |

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + 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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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + 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 + Details
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