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Investments (Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale, Amortized Cost    
Due in one year or less $ 17,046  
Due after one year through five years 68,064  
Due after five years through ten years 247,274  
Due after ten years 601,015  
Total 933,399  
Available-for-sale, Fair Value    
Due in one year or less 16,987  
Due after one year through five years 66,560  
Due after five years through ten years 241,539  
Due after ten years 585,606  
Total 910,692  
Due in one year or less 0  
Held-to-maturity, Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 1,307  
Due after ten years 0  
Held-to-maturity Securities 1,307 $ 94,073
Held-to-maturity, Fair Value    
Held-to-maturity Securities, Debt Maturities, Remainder of Fiscal Year, Fair Value 0  
Due after one year through five years 0  
Due after five years through ten years 1,291  
Due after ten years 0  
Held-to-maturity Securities, Fair Value $ 1,291 $ 94,913