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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
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 434,119 $ 288,175
Gross Unrealized Gain 697 2,656
Gross Unrealized Loss (8,219) (758)
Fair Value 426,597 290,073
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 30,058 42,120
Equity Securities, Gross Unrealized Gains 3,981 9,355
Equity Securities, Gross Unrealized Losses (5,840) (2,780)
Total equity securities 28,199 48,695
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized Cost/ Carrying Value 464,177 330,295
Investments, Gross Unrealized Gains 4,678 12,011
Investments, Gross Unrealized Losses (14,059) (3,538)
Investments, Fair value 454,796 338,768
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 80,616 63,098
Gross Unrealized Gain 9 56
Gross Unrealized Loss (647) (170)
Fair Value 79,978 62,984
Corporate bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 240,185 103,515
Gross Unrealized Gain 625 2,115
Gross Unrealized Loss (5,766) (49)
Fair Value 235,044 105,581
Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 76,418 81,570
Gross Unrealized Gain 6 84
Gross Unrealized Loss (1,241) (465)
Fair Value 75,183 81,189
Municipal bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 35,390 38,162
Gross Unrealized Gain 51 372
Gross Unrealized Loss (423) (70)
Fair Value 35,018 38,464
Mortgage-backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,510 1,830
Gross Unrealized Gain 6 29
Gross Unrealized Loss (142) (4)
Fair Value $ 1,374 $ 1,855