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Reinsurance - Schedule of Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross $ 1,059,251   $ 658,525      
Less: allowance for credit losses (2,000) $ (1,700) (1,700) $ (1,800) $ (1,800) $ (1,600)
Total reinsurance recoverable, net 1,057,251   656,825      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 1,057,078   654,071      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 2,173   4,454      
Federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 325,080   80,506      
Federal and state pools | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 325,080   80,506      
Federal and state pools | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 0   0      
Other than federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 4,774   4,565      
Other than federal and state pools | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 4,679   4,488      
Other than federal and state pools | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 95   77      
Total non-rated reinsurers            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 329,854   85,071      
Total non-rated reinsurers | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 329,759   84,994      
Total non-rated reinsurers | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 95   77      
A++            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 109,922   82,487      
A++ | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 109,343   82,466      
A++ | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 579   21      
A+            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 476,187   374,019      
A+ | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 475,190   371,132      
A+ | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 997   2,887      
A            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 137,607   113,263      
A | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 137,194   111,883      
A | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 413   1,380      
A-            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 5,681   3,685      
A- | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 5,592   3,596      
A- | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 89   89      
Total rated reinsurers            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 729,397   573,454      
Total rated reinsurers | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 727,319   569,077      
Total rated reinsurers | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross $ 2,078   $ 4,377