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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less $ 95,071 $ 66,100
Investments, Fair Value Longer than 12 months 25,111 10,716
Investments, Total Fair Value 120,182 76,816
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (1,115) (2,413)
Investments, Unrealized Losses Longer than 12 months (2,423) (2,169)
Investments, Total Unrealized Losses (3,538) (4,582)
Debt Securities [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 88,850 56,528
Debt securities, Fair Value Longer than 12 months 20,056 8,868
Debt securities, Total Fair Value 108,906 65,396
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (405) (803)
Debt securities, Unrealized Losses Longer than 12 months (353) (531)
Debt securities, Total Unrealized Losses 758 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 43,273 0
Debt securities, Fair Value Longer than 12 months 0 0
Debt securities, Total Fair Value 43,273 0
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (170) 0
Debt securities, Unrealized Losses Longer than 12 months 0 0
Debt securities, Total Unrealized Losses 170 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 2,245 3,556
Debt securities, Total Fair Value 2,245 11,357
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less 0 (186)
Debt securities, Unrealized Losses Longer than 12 months (49) (198)
Debt securities, Total Unrealized Losses 49 384
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 42,256 45,233
Debt securities, Fair Value Longer than 12 months 16,763 4,144
Debt securities, Total Fair Value 59,019 49,377
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (177) (559)
Debt securities, Unrealized Losses Longer than 12 months (288) (312)
Debt securities, Total Unrealized Losses 465 871
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 3,321 2,859
Debt securities, Fair Value Longer than 12 months 1,038 1,154
Debt securities, Total Fair Value 4,359 4,013
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (58) (33)
Debt securities, Unrealized Losses Longer than 12 months (12) (17)
Debt securities, Total Unrealized Losses 70 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 10 14
Debt securities, Total Fair Value 10 649
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 6,221 9,572
Equity securities, Fair Value Longer than 12 months 5,055 1,848
Equity securities, Total Fair Value 11,276 11,420
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (710) (1,610)
Equity securities, Unrealized Losses Longer than 12 months (2,070) (1,638)
Equity securities, Total Unrealized Losses $ (2,780) $ (3,248)