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Investment Securities (Amortized Cost And Fair Value Of Investment Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale, Amortized cost [Abstract]    
Due before one year $ 2,367  
Due after one year through five years 54,439  
Due after five years through ten years 277,018  
Due after ten years 969,226  
Amortized cost 1,303,050  
Available-for-sale, Fair value [Abstract]    
Due before one year 2,360  
Due after one year through five years 54,034  
Due after five years through ten years 267,347  
Due after ten years 950,676  
Fair value 1,274,417 $ 1,294,484
Held-to-maturity, Amortized cost [Abstract]    
Due after ten years 84,433  
Amortized cost 84,433 86,380
Held-to-maturity, Fair value [Abstract]    
Due after ten years 83,751  
Fair value $ 83,751 $ 85,345