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Investments Available-for-Sale Securities in a Loss Position Narrative (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Rate
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Number of available-for-sale securities in unrealized loss positions 167  
Total Estimate Fair Value $ 324,043 $ 143,922
Gross Unrealized Losses $ 7,936 $ 703
Number of available-for-sale securities in unrealized loss positions, greater than one year 11  
Credit losses $ 0  
Fixed maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, percentage of securities with ratings of A minus or better | Rate 78.30%