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Acquisition of Tokio Millennium Re (Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - TMR
 12 Months Ended
Mar. 22, 2019
USD ($)
state
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]    
Excess purchase price over the fair value of net assets acquired assigned to goodwill $ 13,094,000  
Finite-lived intangible assets $ 11,200,000  
Acquired finite-lived intangibles, weighted average amortization period 10 years 6 months  
Indefinite lived $ 6,800,000 $ 0
Value of business acquired, amortization period 2 years  
Value of business acquired $ 287,600,000  
Impairment loss   6,800,000
Deferred tax liability related to the estimated fair value of the intangible assets recorded 2,281,000  
Deferred tax liability related to other adjustments $ 2,606,000  
Insurance licenses    
Business Acquisition [Line Items]    
Number of states, ability to write reinsurance | state 50  
Impairment loss   $ 6,800,000