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Investments (Amortized Cost and Estimated Fair Value of Investments in Debt and Equity Securities by Category) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost $ 564,602 $ 550,268
Total debt securities 568,831 545,870
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 68,737 68,709
Total equity securities 92,099 80,896
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized cost 637,102 622,740
Investments, Gross Unrealized Gains 35,540 24,959
Investments, Gross Unrealized Losses (8,703) (19,785)
Investments, Fair value 663,939 627,914
Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 8,847  
Total debt securities 8,736  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 564,602 550,268
Debt securities, Gross Unrealized Gain 5,416 4,266
Debt securities, Gross Unrealized Loss (1,187) (8,664)
Total debt securities 568,831 545,870
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]    
Debt securities, Amortized Cost 48,246 48,609
Debt securities, Gross Unrealized Gain 121 5
Debt securities, Gross Unrealized Loss (22) (508)
Total debt securities 48,345 48,106
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 281,228 243,314
Debt securities, Gross Unrealized Gain 3,068 440
Debt securities, Gross Unrealized Loss (174) (1,602)
Total debt securities 284,122 242,152
Debt Securities [Member] | Collateralized Corporate Bank Loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 121,741 131,779
Debt securities, Gross Unrealized Gain 363 19
Debt securities, Gross Unrealized Loss (787) (5,270)
Total debt securities 121,317 126,528
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 104,540 112,574
Debt securities, Gross Unrealized Gain 1,826 3,791
Debt securities, Gross Unrealized Loss (55) (838)
Total debt securities 106,311 115,527
Debt Securities [Member] | Mortgage Backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Debt securities, Amortized Cost 8,847 13,992
Debt securities, Gross Unrealized Gain 38 11
Debt securities, Gross Unrealized Loss (149) (446)
Total debt securities 8,736 13,557
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 68,737 68,709
Equity Securities, Gross Unrealized Gains 30,124 20,693
Equity Securities, Gross Unrealized Losses (6,762) (8,506)
Total equity securities 92,099 80,896
Other Investments [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost 3,763 3,763
Equity Securities, Gross Unrealized Losses (754) (2,615)
Total equity securities $ 3,009 $ 1,148