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Securities (Amortized Cost And Estimated Fair Value Of Securities, Excluding Trading Securities, Presented By Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Securities [Abstract]      
Held to Maturity, Due in one year or less, Amortized Cost $ 1,000    
Held to Maturity, Due after one year through five years, Amortized Cost 247,893    
Held to Maturity, Due after five years through ten years, Amortized Cost 3,320    
Held to Maturity, Due after ten years, Amortized Cost 101,843    
Held to Maturity, Residential mortgage-backed securities, Amortized Cost 11,547    
Held to Maturity, Amortized Cost 365,603 365,996 341,034
Held to Maturity, Due in one year or less, Estimated Fair Value 1,000    
Held to Maturity, Due after one year through five years, Estimated Fair Value 277,168    
Held to Maturity, Due after five years through ten years, Estimated Fair Value 3,623    
Held to Maturity, Due after ten years, Estimated Fair Value 109,313    
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value 11,725    
Held to Maturity, Estimated Fair Value 402,829 404,461  
Available for Sale, Due in one year or less, Amortized Cost 14,850    
Available for Sale, Due after one year through five years, Amortized Cost 3,360,602    
Available for Sale, Due after five years through ten years, Amortized Cost 208,835    
Available for Sale, Due after ten years, Amortized Cost 1,626,491    
Available for Sale, Residential mortgage-backed securities, Amortized Cost 2,967,744    
Available for Sale, Equity securities, Amortized Cost 38,009    
Available for Sale, Amortized Cost 8,216,531 7,440,389  
Available for Sale, Due in one year or less, Estimated Fair Value 15,125    
Available for Sale, Due after one year through five years, Estimated Fair Value 3,396,548    
Available for Sale, Due after five years through ten years, Estimated Fair Value 224,491    
Available for Sale, Due after ten years, Estimated Fair Value 1,770,077    
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value 3,123,965    
Available for Sale, Equity securities, Estimated Fair Value 38,009    
Available for Sale, Estimated Fair Value $ 8,568,215 $ 7,789,700 $ 5,662,211