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Reinsurance - Schedule of Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross $ 949,434   $ 1,063,145      
Less: allowance for credit losses (2,000) $ (2,000) (2,000) $ (2,000) $ (1,700) $ (1,700)
Total reinsurance recoverable, net 947,434   1,061,145      
Federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 101,867   318,785      
Other than federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 11,498   6,656      
Total non-rated reinsurers            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 113,365   325,441      
Current | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 937,162   1,056,738      
Current | Federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 101,867   318,785      
Current | Other than federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 11,444   6,647      
Current | Total non-rated reinsurers            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 113,311   325,432      
Past Due | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 12,272   6,407      
Past Due | Federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 0   0      
Past Due | Other than federal and state pools            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 54   9      
Past Due | Total non-rated reinsurers            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 54   9      
A++            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 132,110   111,706      
A++ | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 130,997   111,481      
A++ | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 1,113   225      
A+            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 562,907   488,522      
A+ | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 555,236   483,317      
A+ | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 7,671   5,205      
A            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 138,169   131,906      
A | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 134,999   131,087      
A | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 3,170   819      
A-            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 2,883   5,570      
A- | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 2,619   5,421      
A- | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 264   149      
Total rated reinsurers            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 836,069   737,704      
Total rated reinsurers | Current            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross 823,851   731,306      
Total rated reinsurers | Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Total reinsurance recoverable, gross $ 12,218   $ 6,398