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Investment Securities (Amortized Cost And Fair Value Of Investment Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale, Amortized cost [Abstract]    
Due before one year $ 6,433  
Due after one year through five years 170,145  
Due after five years through ten years 361,549  
Due after ten years 657,883  
Amortized cost 1,196,010  
Available-for-sale, Fair value [Abstract]    
Due before one year 6,441  
Due after one year through five years 171,473  
Due after five years through ten years 362,268  
Due after ten years 656,774  
Fair value 1,196,956 $ 1,248,614
Held-to-maturity, Amortized cost [Abstract]    
Due after ten years 86,402  
Amortized cost 86,402 93,467
Held-to-maturity, Fair value [Abstract]    
Due after ten years 85,099  
Fair value $ 85,099 $ 91,799