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Reserve for Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Abstract]          
Allowance for credit losses on reinsurance recoverables $ 604 $ 604 $ 335 $ 631 $ 335
Development on prior year loss reserves          
Development on prior year loss reserves   6,804 170,134    
Funds held $ 371,853 371,853   $ 97,360  
Losses and loss adjustment expenses   135,608 273,500    
Current year   128,804 103,366    
Loss Portfolio Transfer | Fortitude Reinsurance | JRG Reinsurance Company Ltd          
Development on prior year loss reserves          
Crediting rate on funds withheld 2.00%        
Excess and Surplus Lines          
Development on prior year loss reserves          
Development on prior year loss reserves   (59) 168,700    
Excess and Surplus Lines | Commercial Auto Business          
Development on prior year loss reserves          
Development on prior year loss reserves     170,000    
Specialty Admitted Insurance          
Development on prior year loss reserves          
Development on prior year loss reserves   63 (1,000)    
Casualty Reinsurance          
Development on prior year loss reserves          
Development on prior year loss reserves     $ 2,500    
Casualty Reinsurance | Loss Portfolio Transfer | Fortitude Reinsurance | JRG Reinsurance Company Ltd          
Development on prior year loss reserves          
Development on prior year loss reserves   6,800      
Reinsurance, aggregate coverage limit $ 400,000 400,000      
Ceded premiums payable 335,000 335,000      
Funds held 310,000 310,000      
Payments for reinsurance $ 25,000        
Losses and loss adjustment expenses   11,500      
Current year   $ 4,700