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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
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