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Reinsurance - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Ceded Losses and LAE Incurred | $ 76,843,000 | $ 666,949,000 | $ 26,904,000
Ceded Premiums Earned | 354,080,000 | $ 266,023,000 | $ 244,630,000
Ian Remaining Limit | 508 |  |
Reinstatement Premium - 2022/2023 CAT XOL | 15.4 |  |
2022-2023 CAT XOL Remaining Limit | 980 |  |
Reinsurance Contract [Axis]: XOL Commutation |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Ceded Premiums Earned | 6,300,000 |  |
American Coastal Insurance Company |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Event Retention Level | 10,000,000 |  |
American Coastal Insurance Company | Catastrophe Excess of Loss |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 1,300,000,000 |  |
Reinsurance Retention Excess Retention Amount Reinsured Per Loss Event | 1,100,000,000 |  |
American Coastal Insurance Company | All Other Perils Catastrophe Excess of Loss |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 101,000,000 |  |
Interboro Insurance Company |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Event Retention Level | 3,000,000 |  |
Interboro Insurance Company | Catastrophe Excess of Loss |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 82,000,000 |  |
UPC Re |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Event Retention Level | $ 2,250,000 |  |

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