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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
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value $ 389,582 $ 288,175
Fair Value 388,254 290,073
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 46,125 42,120
Total equity securities 52,604 48,695
Investments, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Investments, Amortized Cost/ Carrying Value 435,707 330,295
Investments, Gross Unrealized Gains 11,451 12,011
Investments, Gross Unrealized Losses (6,300) (3,538)
Investments, Fair value 440,858 338,768
Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,746  
Fair Value 1,744  
Debt Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 389,582 288,175
Gross Unrealized Gain 1,618 2,656
Gross Unrealized Loss (2,946) (758)
Fair Value 388,254 290,073
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 43,175 63,098
Gross Unrealized Gain 0 56
Gross Unrealized Loss (692) (170)
Fair Value 42,483 62,984
Debt Securities [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 221,775 103,515
Gross Unrealized Gain 1,454 2,115
Gross Unrealized Loss (1,109) (49)
Fair Value 222,120 105,581
Debt Securities [Member] | Corporate bank loans [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 81,024 81,570
Gross Unrealized Gain 9 84
Gross Unrealized Loss (1,015) (465)
Fair Value 80,018 81,189
Debt Securities [Member] | Municipal Bonds [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 41,862 38,162
Gross Unrealized Gain 144 372
Gross Unrealized Loss (117) (70)
Fair Value 41,889 38,464
Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Amortized Cost/ Carrying Value 1,746 1,830
Gross Unrealized Gain 11 29
Gross Unrealized Loss (13) (4)
Fair Value 1,744 1,855
Equity Securities [Member]    
Equity Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Equity securities, Amortized Cost/ Carrying Value 46,125 42,120
Equity Securities, Gross Unrealized Gains 9,833 9,355
Equity Securities, Gross Unrealized Losses (3,354) (2,780)
Total equity securities $ 52,604 $ 48,695