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Business Combination (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
May 05, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]            
Contingent consideration   $ 24,000,000 $ 0 $ 24,000,000 $ 0 $ 0
Gain on bargain purchase   74,408,000 0 74,408,000 0  
Fair value adjustment on reserves, net            
Business Acquisition [Line Items]            
Present value of future insurance profits, expected amortization $ 38,700,000          
NORCAL Group            
Business Acquisition [Line Items]            
Percentage of interest acquired 98.00%          
Total acquisition consideration $ 448,809,000          
Payments to acquire business 248,000,000.0          
Business combination, consideration transferred, equity interests issued and issuable 1,800,000          
Contingent consideration, maximum estimate 84,000,000.0          
Contingent consideration 24,000,000.0 24,000,000.0   24,000,000.0    
Proassurance actual revenue consolidation results   53,300,000        
Proassurance actual net loss consolidated results   (5,000,000.0)        
Transaction-related costs   $ 20,300,000 $ 600,000 $ 21,200,000 $ 1,100,000  
Gain on bargain purchase 74,408,000          
Deferred tax asset, net 46,759,000          
Intangible assets 14,000,000          
Business combination, fair values adjustments on gross reserve 42,200,000          
Business combination, fair values adjustments on reinsurance recoverables 3,500,000          
Present value of future insurance profits, expected amortization 53,844,000          
NORCAL Group | Unearned premium VOBA, net            
Business Acquisition [Line Items]            
Present value of future insurance profits, expected amortization 11,676,000          
Estimated negative VOBA 12,400,000          
NORCAL Group | Fair value adjustment on reserves, net            
Business Acquisition [Line Items]            
Present value of future insurance profits, expected amortization 38,701,000          
Estimated negative VOBA 700,000          
NORCAL Group | DDR reserve VOBA            
Business Acquisition [Line Items]            
Present value of future insurance profits, expected amortization 3,467,000          
NORCAL Group | Contribution certificates            
Business Acquisition [Line Items]            
Principal amount 191,000,000          
Debt instruments $ 175,000,000