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Investments, Fixed Income Securities in Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Fixed Income Securities, Unrealized Loss Position, Number of Securities [Abstract]    
Number of securities, 12 months or less | Security 100 88
Number of securities, Greater than 12 months | Security 24 69
Number of securities, total | Security 124 157
Fixed Income Securities, Unrealized Loss Position, Fair Value [Abstract]    
Fair value, 12 months or less $ 120,630 $ 108,387
Fair value, Greater than 12 months 33,065 66,860
Fair value, total 153,695 175,247
Fixed Income Securities, Unrealized Loss Position, Gross Unrealized Loss [Abstract]    
Gross unrealized loss, 12 months or less (3,405) (2,452)
Gross unrealized loss, Greater than 12 months (1,333) (1,100)
Gross unrealized loss, total $ (4,738) $ (3,552)