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Loss And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Unusual or Infrequent Item, or Both [Line Items]    
Prior years $ (74,192) $ 16,463
Liability for catastrophe claims, carrying amount 489,000 236,000
Fire    
Unusual or Infrequent Item, or Both [Line Items]    
Subrogation recorded 574,000  
Net losses and loss adjustment expenses on Eaton and Palisades fires 381,000  
Amount paid out for claims $ 1,404,000  
Percent of collections from reinsurers 100.00%  
Reinstatement premium $ 101,000  
Catastrophe    
Unusual or Infrequent Item, or Both [Line Items]    
Adjustments for prior year claims $ (18,000) $ 7,000