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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 66,100 $ 53,693
Investments, Fair Value Longer than 12 months 10,716 27,333
Investments, Total Fair Value 76,816 81,026
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (2,413) (2,678)
Investments, Unrealized Losses Longer than 12 months (2,169) (7,525)
Investments, Total Unrealized Losses (4,582) (10,203)
Other Investments [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 0 0
Equity securities, Fair Value Longer than 12 months 0 2,169
Equity securities, Total Fair Value 0 2,169
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less 0 0
Equity securities, Unrealized Losses Longer than 12 months 0 (1,594)
Equity securities, Total Unrealized Losses 0 (1,594)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 56,528 42,788
Debt securities, Fair Value Longer than 12 months 8,868 19,071
Debt securities, Total Fair Value 65,396 61,859
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (803) (315)
Debt securities, Unrealized Losses Longer than 12 months (531) (586)
Debt securities, Total Unrealized Losses 1,334 901
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 5,513
Debt securities, Total Fair Value 0 5,513
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less 0 0
Debt securities, Unrealized Losses Longer than 12 months 0 (3)
Debt securities, Total Unrealized Losses 0 3
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 7,801 27,268
Debt securities, Fair Value Longer than 12 months 3,556 1,150
Debt securities, Total Fair Value 11,357 28,418
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (186) (144)
Debt securities, Unrealized Losses Longer than 12 months (198) (19)
Debt securities, Total Unrealized Losses 384 163
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 45,233 9,000
Debt securities, Fair Value Longer than 12 months 4,144 10,228
Debt securities, Total Fair Value 49,377 19,228
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (559) (41)
Debt securities, Unrealized Losses Longer than 12 months (312) (427)
Debt securities, Total Unrealized Losses 871 468
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 2,859 4,808
Debt securities, Fair Value Longer than 12 months 1,154 1,618
Debt securities, Total Fair Value 4,013 6,426
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (33) (29)
Debt securities, Unrealized Losses Longer than 12 months (17) (19)
Debt securities, Total Unrealized Losses 50 48
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 635 1,712
Debt securities, Fair Value Longer than 12 months 14 562
Debt securities, Total Fair Value 649 2,274
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (25) (101)
Debt securities, Unrealized Losses Longer than 12 months (4) (118)
Debt securities, Total Unrealized Losses 29 219
Equity Securities [Member]    
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 9,572 10,905
Equity securities, Fair Value Longer than 12 months 1,848 6,093
Equity securities, Total Fair Value 11,420 16,998
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (1,610) (2,363)
Equity securities, Unrealized Losses Longer than 12 months (1,638) (5,345)
Equity securities, Total Unrealized Losses $ (3,248) $ (7,708)