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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 40,749 $ 66,100
Investments, Fair Value Longer than 12 months 28,188 10,716
Investments, Total Fair Value 68,937 76,816
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (517) (2,413)
Investments, Unrealized Losses Longer than 12 months (2,075) (2,169)
Investments, Total Unrealized Losses (2,592) (4,582)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 31,235 56,528
Debt securities, Fair Value Longer than 12 months 24,045 8,868
Debt securities, Total Fair Value 55,280 65,396
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (182) (803)
Debt securities, Unrealized Losses Longer than 12 months (495) (531)
Debt securities, Total Unrealized Losses 677 1,334
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 0 0
Debt securities, Fair Value Longer than 12 months 0 0
Debt securities, Total Fair Value 0 0
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less 0 0
Debt securities, Unrealized Losses Longer than 12 months 0 0
Debt securities, Total Unrealized Losses 0 0
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 0 7,801
Debt securities, Fair Value Longer than 12 months 2,592 3,556
Debt securities, Total Fair Value 2,592 11,357
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less 0 (186)
Debt securities, Unrealized Losses Longer than 12 months (73) (198)
Debt securities, Total Unrealized Losses 73 384
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 27,235 45,233
Debt securities, Fair Value Longer than 12 months 20,443 4,144
Debt securities, Total Fair Value 47,678 49,377
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (125) (559)
Debt securities, Unrealized Losses Longer than 12 months (407) (312)
Debt securities, Total Unrealized Losses 532 871
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 4,000 2,859
Debt securities, Fair Value Longer than 12 months 999 1,154
Debt securities, Total Fair Value 4,999 4,013
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (57) (33)
Debt securities, Unrealized Losses Longer than 12 months (11) (17)
Debt securities, Total Unrealized Losses 68 50
Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 0 635
Debt securities, Fair Value Longer than 12 months 11 14
Debt securities, Total Fair Value 11 649
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less 0 (25)
Debt securities, Unrealized Losses Longer than 12 months (4) (4)
Debt securities, Total Unrealized Losses 4 29
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 9,514 9,572
Equity securities, Fair Value Longer than 12 months 4,143 1,848
Equity securities, Total Fair Value 13,657 11,420
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (335) (1,610)
Equity securities, Unrealized Losses Longer than 12 months (1,580) (1,638)
Equity securities, Total Unrealized Losses $ (1,915) $ (3,248)