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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
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 344,714 $ 434,119
Gross Unrealized Gain 724 697
Gross Unrealized Loss (5,384) (8,219)
Fair Value 340,054 426,597
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 24,281 30,058
Total equity securities 22,392 28,199
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized Cost/ Carrying Value 368,995 464,177
Investments, Gross Unrealized Gains 3,483 4,678
Investments, Gross Unrealized Losses (10,032) (14,059)
Investments, Fair value 362,446 454,796
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 54,876 80,616
Gross Unrealized Gain 34 9
Gross Unrealized Loss (283) (647)
Fair Value 54,627 79,978
Corporate bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 200,684 240,185
Gross Unrealized Gain 620 625
Gross Unrealized Loss (4,073) (5,766)
Fair Value 197,231 235,044
Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 54,584 76,418
Gross Unrealized Gain 7 6
Gross Unrealized Loss (576) (1,241)
Fair Value 54,015 75,183
Municipal bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 33,086 35,390
Gross Unrealized Gain 58 51
Gross Unrealized Loss (300) (423)
Fair Value 32,844 35,018
Mortgage-backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,484 1,510
Gross Unrealized Gain 5 6
Gross Unrealized Loss (152) (142)
Fair Value 1,337 1,374
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 24,281 30,058
Equity Securities, Gross Unrealized Gains 2,759 3,981
Equity Securities, Gross Unrealized Losses (4,648) (5,840)
Total equity securities $ 22,392 $ 28,199