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Investments (Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 344,232 $ 502,167
Fair Value 348,525 507,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 46,847 26,988
Total equity securities 53,621 29,388
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost/ Carrying Value 391,079 529,155
Investments, Gross Unrealized Gains 14,236 12,094
Investments, Gross Unrealized Losses (3,169) (4,582)
Investments, Fair value 402,146 536,667
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 3,382  
Fair Value 3,390  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 344,232 502,167
Gross Unrealized Gain 5,262 6,446
Gross Unrealized Loss (969) (1,334)
Fair Value 348,525 507,279
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]    
Amortized Cost/ Carrying Value 45,088 179,259
Gross Unrealized Gain 320 487
Gross Unrealized Loss (1) 0
Fair Value 45,407 179,746
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 187,405 214,666
Gross Unrealized Gain 4,258 5,086
Gross Unrealized Loss (123) (384)
Fair Value 191,540 219,368
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 60,330 53,650
Gross Unrealized Gain 7 3
Gross Unrealized Loss (737) (871)
Fair Value 59,600 52,782
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 48,027 49,833
Gross Unrealized Gain 607 756
Gross Unrealized Loss (46) (50)
Fair Value 48,588 50,539
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 3,382 4,759
Gross Unrealized Gain 70 114
Gross Unrealized Loss (62) (29)
Fair Value 3,390 4,844
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 46,847 26,988
Equity Securities, Gross Unrealized Gains 8,974 5,648
Equity Securities, Gross Unrealized Losses (2,200) (3,248)
Total equity securities $ 53,621 $ 29,388