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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
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 315,029 $ 502,167
Fair Value 317,916 507,279
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 39,129 26,988
Total equity securities 45,362 29,388
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost/ Carrying Value 354,158 529,155
Investments, Gross Unrealized Gains 11,712 12,094
Investments, Gross Unrealized Losses (2,592) (4,582)
Investments, Fair value 363,278 536,667
Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,967  
Fair Value 2,018  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 315,029 502,167
Gross Unrealized Gain 3,564 6,446
Gross Unrealized Loss (677) (1,334)
Fair Value 317,916 507,279
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 66,354 179,259
Gross Unrealized Gain 142 487
Gross Unrealized Loss 0 0
Fair Value 66,496 179,746
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 119,341 214,666
Gross Unrealized Gain 2,829 5,086
Gross Unrealized Loss (73) (384)
Fair Value 122,097 219,368
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 86,749 53,650
Gross Unrealized Gain 117 3
Gross Unrealized Loss (532) (871)
Fair Value 86,334 52,782
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 40,618 49,833
Gross Unrealized Gain 421 756
Gross Unrealized Loss (68) (50)
Fair Value 40,971 50,539
Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,967 4,759
Gross Unrealized Gain 55 114
Gross Unrealized Loss (4) (29)
Fair Value 2,018 4,844
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 39,129 26,988
Equity Securities, Gross Unrealized Gains 8,148 5,648
Equity Securities, Gross Unrealized Losses (1,915) (3,248)
Total equity securities $ 45,362 $ 29,388