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Statutory Accounting and Regulation - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statutory Accounting Practices |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | $ 251,009 | $ 166,113 |
Statutory Accounting Practices, Statutory Net Income Amount | 75,473 | 102,414 | $ 14,095
American Coastal Insurance Company |  |  |
Statutory Accounting Practices |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 230,001 | 143,452 |
Statutory Accounting Practices, Statutory Net Income Amount | 77,117 | 105,862 | 16,516
Interboro Insurance |  |  |
Statutory Accounting Practices |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 21,008 | 22,661 |
Statutory Accounting Practices, Statutory Net Income Amount | (1,644) | $ (3,448) | $ (2,421)
American Coastal Insurance Company |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | 169,828 |  |
Interboro Insurance Company |  |  |
Statutory Accounting Practices |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries | $ 19,042 |  |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(3)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477908/944-505-50-1 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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