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Investment Securities (Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investment Securities [Abstract]    
Debt securities available for sale, Due in one year or less, Amortized Cost $ 27  
Debt securities available for sale, Due from one to five years, Amortized Cost 145,749  
Debt securities available for sale, Due after five years through ten years, Amortized Cost 302,203  
Debt securities available for sale, Due after ten years, Amortized Cost 95,529  
Debt securities available for sale, Amortized Cost 543,508  
Debt securities available for sale, Due in one year or less, Fair Value 27  
Debt securities available for sale, Due from one to five years, Fair Value 145,749  
Debt securities available for sale, Due after five years through ten years, Fair Value 300,102  
Debt securities available for sale, Due after ten years, Fair Value 94,528  
Debt securities available for sale, Fair Value 540,406  
Debt securities held to maturity, Due in one year or less, Amortized Cost 51,256  
Debt securities held to maturity, Due from one to five years, Amortized Cost 176,638  
Debt securities held to maturity, Due after five years through ten years, Amortized Cost 91,549  
Debt securities held to maturity, Due after ten years, Amortized Cost 225,938  
Securities held to maturity, Amortized Cost 545,381 $ 543,338
Debt securities held to maturity, Due in one year or less, Fair Value 51,326  
Debt securities held to maturity, Due from one to five years, Fair Value 179,806  
Debt securities held to maturity, Due after five years through ten years, Fair Value 91,059  
Debt securities held to maturity, Due after ten years, Fair Value 222,247  
Securities held to maturity, Fair Value $ 544,438 $ 539,991