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Investments (Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost $ 502,167 $ 569,498
Fair Value 507,279 574,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 26,988 71,895
Total equity securities 29,388 99,215
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost 529,155 645,156
Investments, Gross Unrealized Gains 12,094 40,710
Investments, Gross Unrealized Losses (4,582) (10,203)
Investments, Fair value 536,667 675,663
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 4,759  
Fair Value 4,843  
Other Investments [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 0 3,763
Equity Securities, Gross Unrealized Gains 0 0
Equity Securities, Gross Unrealized Losses 0 (1,594)
Total equity securities 0 2,169
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 502,167 569,498
Gross Unrealized Gain 6,446 5,682
Gross Unrealized Loss (1,334) (901)
Fair Value 507,279 574,279
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]    
Amortized Cost 179,259 66,441
Gross Unrealized Gain 487 162
Gross Unrealized Loss   (3)
Fair Value 179,746 66,600
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 214,666 297,601
Gross Unrealized Gain 5,086 3,387
Gross Unrealized Loss (384) (163)
Fair Value 219,368 300,825
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 53,650 115,669
Gross Unrealized Gain 3 556
Gross Unrealized Loss (871) (468)
Fair Value 52,782 115,757
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 49,833 81,787
Gross Unrealized Gain 756 1,531
Gross Unrealized Loss (50) (48)
Fair Value 50,539 83,270
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 4,759 8,000
Gross Unrealized Gain 114 46
Gross Unrealized Loss (29) (219)
Fair Value 4,844 7,827
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 26,988 71,895
Equity Securities, Gross Unrealized Gains 5,648 35,028
Equity Securities, Gross Unrealized Losses (3,248) (7,708)
Total equity securities $ 29,388 $ 99,215