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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
security
item
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]        
Fair value   $ 458,276   $ 486,836
Number of investments in a single issuer exceeds 10% of shareholders' equity | item   0    
Percent of shareholders equity benchmark for investments in a single issuer   10.00%    
Number of debt securities | security   578   591
Fair value of temporarily impaired securities   $ 448,915   $ 474,847
Unrealized Losses   67,340   61,531
Decrease in unrealized loss position   5,800    
Gross unrealized gains   88   34
Equity securities   386   411
Debt Securities, Available-for-sale, Realized Gain (Loss) $ (15) (1,119) $ (34)  
Proceeds from Sale of Debt Securities, Available-for-sale $ 1,000 40,117 $ 1,082  
Corporate [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Fair value   $ 22,983   $ 24,239
Number of debt securities | security   51   46
Fair value of temporarily impaired securities   $ 22,983   $ 22,589
Unrealized Losses   3,348   2,077
Public Funds And Trust Deposits [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Fair value   $ 199,100   $ 208,900
Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Number of equity investments | item   1