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Investments (Cost or Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost $ 288,175 $ 502,167
Fair Value 290,073 507,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Cost/Amortized Cost 42,120 26,988
Total equity securities 48,695 29,388
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Cost/Amortized Cost 330,295 529,155
Investments, Gross Unrealized Gains 12,011 12,094
Investments, Gross Unrealized Losses (3,538) (4,582)
Investments, Fair value 338,768 536,667
Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 1,830  
Fair Value 1,855  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 288,175 502,167
Gross Unrealized Gain 2,656 6,446
Gross Unrealized Loss (758) (1,334)
Fair Value 290,073 507,279
Debt Securities [Member] | U.S. Treasury securities and obligations of U.S. Government [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 63,098 179,259
Gross Unrealized Gain 56 487
Gross Unrealized Loss (170) 0
Fair Value 62,984 179,746
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 103,515 214,666
Gross Unrealized Gain 2,115 5,086
Gross Unrealized Loss (49) (384)
Fair Value 105,581 219,368
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 81,570 53,650
Gross Unrealized Gain 84 3
Gross Unrealized Loss (465) (871)
Fair Value 81,189 52,782
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 38,162 49,833
Gross Unrealized Gain 372 756
Gross Unrealized Loss (70) (50)
Fair Value 38,464 50,539
Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Cost/Amortized Cost 1,830 4,759
Gross Unrealized Gain 29 114
Gross Unrealized Loss (4) (29)
Fair Value 1,855 4,844
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Cost/Amortized Cost 42,120 26,988
Equity Securities, Gross Unrealized Gains 9,355 5,648
Equity Securities, Gross Unrealized Losses (2,780) (3,248)
Total equity securities $ 48,695 $ 29,388