v3.22.2.2
Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 356,736 $ 95,071
Investments, Fair Value Longer than 12 months 47,813 25,111
Investments, Total Fair Value 404,549 120,182
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (10,700) (1,115)
Investments, Unrealized Losses Longer than 12 months (7,988) (2,423)
Investments, Total Unrealized Losses (18,688) (3,538)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 348,157 88,850
Debt securities, Fair Value Longer than 12 months 36,248 20,056
Debt securities, Total Fair Value 384,405 108,906
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (9,973) (405)
Debt securities, Unrealized Losses Longer than 12 months (1,355) (353)
Debt securities, Total Unrealized Losses 11,328 758
Debt Securities [Member] | U.S. Treasury securities and obligations of U.S. Government [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 40,824 43,273
Debt securities, Fair Value Longer than 12 months 0 0
Debt securities, Total Fair Value 40,824 43,273
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (907) (170)
Debt securities, Unrealized Losses Longer than 12 months 0 0
Debt securities, Total Unrealized Losses 907 170
Debt Securities [Member] | Corporate bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 253,177 0
Debt securities, Fair Value Longer than 12 months 195 2,245
Debt securities, Total Fair Value 253,372 2,245
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (6,831) 0
Debt securities, Unrealized Losses Longer than 12 months (6) (49)
Debt securities, Total Unrealized Losses 6,837 49
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 39,488 42,256
Debt securities, Fair Value Longer than 12 months 34,279 16,763
Debt securities, Total Fair Value 73,767 59,019
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (1,577) (177)
Debt securities, Unrealized Losses Longer than 12 months (1,312) (288)
Debt securities, Total Unrealized Losses 2,889 465
Debt Securities [Member] | Municipal bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 13,216 3,321
Debt securities, Fair Value Longer than 12 months 1,767 1,038
Debt securities, Total Fair Value 14,983 4,359
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (579) (58)
Debt securities, Unrealized Losses Longer than 12 months (31) (12)
Debt securities, Total Unrealized Losses 610 70
Debt Securities [Member] | Mortgage-backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 1,452 0
Debt securities, Fair Value Longer than 12 months 7 10
Debt securities, Total Fair Value 1,459 10
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (79) 0
Debt securities, Unrealized Losses Longer than 12 months (6) (4)
Debt securities, Total Unrealized Losses 85 4
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 8,579 6,221
Equity securities, Fair Value Longer than 12 months 11,565 5,055
Equity securities, Total Fair Value 20,144 11,276
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (727) (710)
Equity securities, Unrealized Losses Longer than 12 months (6,633) (2,070)
Equity securities, Total Unrealized Losses $ (7,360) $ (2,780)