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Reinsurance - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Ceded Losses and LAE Incurred |  | $ 1,758,194 | $ 911,441 | $ 645,204
Commission and Fees on Flood Revenue |  | 919 | $ 1,501 | $ 1,467
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | $ 2,500,000 |  |  |
Event Retention Level |  | 16,400 |  |
Interboro Insurance |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Event Retention Level |  | 3,000 |  |
Interboro Insurance | Catastrophe Excess of Loss |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  | $ 200,000 |  |

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- References No definition available. + Details
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- Definition Ceded Losses and LAE Incurred + References No definition available. + Details
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- Definition Commission and Fees on Flood Revenue + References No definition available. + Details
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- Definition Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Details
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