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Investments (Amortized Cost & Carrying Value and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 270,975 $ 434,119
Gross Unrealized Gain 354 697
Gross Unrealized Loss (3,645) (8,219)
Fair Value 267,684 426,597
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 21,142 30,058
Total equity securities 19,759 28,199
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized Cost/ Carrying Value 292,117 464,177
Investments, Gross Unrealized Gains 4,027 4,678
Investments, Gross Unrealized Losses (8,701) (14,059)
Investments, Fair value 287,443 454,796
U.S. Treasury securities and obligations of U.S. Government [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 22,890 80,616
Gross Unrealized Gain 0 9
Gross Unrealized Loss (212) (647)
Fair Value 22,678 79,978
Corporate bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 172,385 240,185
Gross Unrealized Gain 267 625
Gross Unrealized Loss (2,405) (5,766)
Fair Value 170,247 235,044
Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 47,334 76,418
Gross Unrealized Gain 52 6
Gross Unrealized Loss (227) (1,241)
Fair Value 47,159 75,183
Municipal bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 26,953 35,390
Gross Unrealized Gain 29 51
Gross Unrealized Loss (578) (423)
Fair Value 26,404 35,018
Mortgage-backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,413 1,510
Gross Unrealized Gain 6 6
Gross Unrealized Loss (223) (142)
Fair Value 1,196 1,374
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 21,142 30,058
Equity Securities, Gross Unrealized Gains 3,673 3,981
Equity Securities, Gross Unrealized Losses (5,056) (5,840)
Total equity securities $ 19,759 $ 28,199