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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
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 299,544 $ 434,119
Gross Unrealized Gain 882 697
Gross Unrealized Loss (4,665) (8,219)
Fair Value 295,761 426,597
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 24,284 30,058
Total equity securities 22,763 28,199
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized Cost/ Carrying Value 323,828 464,177
Investments, Gross Unrealized Gains 4,062 4,678
Investments, Gross Unrealized Losses (9,366) (14,059)
Investments, Fair value 318,524 454,796
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 22,460 80,616
Gross Unrealized Gain 193 9
Gross Unrealized Loss (218) (647)
Fair Value 22,435 79,978
Corporate bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 194,504 240,185
Gross Unrealized Gain 416 625
Gross Unrealized Loss (3,575) (5,766)
Fair Value 191,345 235,044
Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 49,749 76,418
Gross Unrealized Gain 47 6
Gross Unrealized Loss (293) (1,241)
Fair Value 49,503 75,183
Municipal bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 31,378 35,390
Gross Unrealized Gain 220 51
Gross Unrealized Loss (358) (423)
Fair Value 31,240 35,018
Mortgage-backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,453 1,510
Gross Unrealized Gain 6 6
Gross Unrealized Loss (221) (142)
Fair Value 1,238 1,374
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 24,284 30,058
Equity Securities, Gross Unrealized Gains 3,180 3,981
Equity Securities, Gross Unrealized Losses (4,701) (5,840)
Total equity securities $ 22,763 $ 28,199