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Investments (Summary of Gross Unrealized Gain (Loss) on Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less $ 299,245 $ 88,850
Debt securities, Fair Value Longer than 12 months 76,110 20,056
Debt securities, Total Fair Value 375,355 108,906
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (7,028) (405)
Debt securities, Unrealized Losses Longer than 12 months (1,191) (353)
Debt securities, Total Unrealized Losses 8,219 758
Equity Securities, Unrealized Loss Position, Fair Value    
Equity securities, Fair Value 12 months or less 8,118 6,221
Equity securities, Fair Value Longer than 12 months 3,211 5,055
Equity securities, Total Fair Value 11,329 11,276
Equity Securities, Unrealized Loss    
Equity securities, Unrealized Losses 12 months or less (3,835) (710)
Equity securities, Unrealized Losses Longer than 12 months (2,005) (2,070)
Equity securities, Total Unrealized Losses (5,840) (2,780)
Investments, Unrealized Loss Position, Fair Value    
Investments, Fair Value 12 months or less 307,363 95,071
Investments, Fair Value Longer than 12 months 79,321 25,111
Investments, Total Fair Value 386,684 120,182
Investments, Unrealized Losses    
Investments, Unrealized Losses 12 months or less (10,863) (1,115)
Investments, Unrealized Losses Longer than 12 months (3,196) (2,423)
Investments, Total Unrealized Losses (14,059) (3,538)
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 17,543 43,273
Debt securities, Fair Value Longer than 12 months 37,622 0
Debt securities, Total Fair Value 55,165 43,273
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (67) (170)
Debt securities, Unrealized Losses Longer than 12 months (580) 0
Debt securities, Total Unrealized Losses 647 170
Corporate bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 232,722 0
Debt securities, Fair Value Longer than 12 months 99 2,245
Debt securities, Total Fair Value 232,821 2,245
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (5,764) 0
Debt securities, Unrealized Losses Longer than 12 months (2) (49)
Debt securities, Total Unrealized Losses 5,766 49
Corporate bank loans [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 37,339 42,256
Debt securities, Fair Value Longer than 12 months 36,107 16,763
Debt securities, Total Fair Value 73,446 59,019
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (678) (177)
Debt securities, Unrealized Losses Longer than 12 months (563) (288)
Debt securities, Total Unrealized Losses 1,241 465
Municipal bonds [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 10,293 3,321
Debt securities, Fair Value Longer than 12 months 2,275 1,038
Debt securities, Total Fair Value 12,568 4,359
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (383) (58)
Debt securities, Unrealized Losses Longer than 12 months (40) (12)
Debt securities, Total Unrealized Losses 423 70
Mortgage-backed [Member]    
Debt Securities, Unrealized Loss Position, Fair Value    
Debt securities, Fair Value 12 months or less 1,348 0
Debt securities, Fair Value Longer than 12 months 7 10
Debt securities, Total Fair Value 1,355 10
Debt securities, Unrealized Losses    
Debt securities, Unrealized Losses 12 months or less (136) 0
Debt securities, Unrealized Losses Longer than 12 months (6) (4)
Debt securities, Total Unrealized Losses $ 142 $ 4