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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Total Fair value $ 1,263,965 $ 1,176,266
Securities Held-to-Maturity, Amortized Cost 150,349 182,061
Securities held-to-maturity, fair value 152,986 187,402
Obligations Of States And Political Subdivisions [Member]
    
Schedule of Investments [Line Items]    
Securities Held-to-Maturity, Amortized Cost   240
Securities held-to-maturity, fair value   241
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Due one through five years, Amortized cost 173,750  
Securities Available-for-Sale, Due one through five years, Fair value 168,675  
Available for Sale Securities Debt Maturities After One Through Five Years Weighted Avg Yield 1.82%  
Securities Available-for-Sale, Due five through ten years, Amortized cost 396,885  
Securities Available-for-Sale, Due five through ten years, Fair value 382,484  
Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Avg Yield 2.43%  
Securities Available-for-Sale, Total, Amortized cost 570,635  
Securities Available-for-Sale, Total Fair value 551,159 525,136
Available for Sale Securities Weighted Avg Yield 2.24%  
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
    
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Total, Amortized cost 705,603  
Securities Available-for-Sale, Total Fair value 710,221 648,471
Available for Sale Securities Weighted Avg Yield 2.41%  
Securities Held-to-Maturity, Amortized Cost 150,349 181,821
Securities held-to-maturity, fair value $ 152,986 $ 187,161
Held to Maturity Securities weighted avg yield 3.60%