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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Schedule of Investments [Line Items]  
Securities Available-for-Sale, at Fair value$ 797,163$ 1,297,522
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
  
Schedule of Investments [Line Items]  
Securities Available-for-Sale, Due within one year, Amortized cost223,459 
Securities Available-for-Sale, Due within one year, Fair value224,817 
Securities Available-for-Sale, Total, Amortized cost223,459 
Securities Available-for-Sale, at Fair value224,817273,313
Obligations Of States And Political Subdivisions [Member]
  
Schedule of Investments [Line Items]  
Securities Available-for-Sale, Due within one year, Amortized cost2,315 
Securities Available-for-Sale, Due within one year, Fair value2,327 
Securities Available-for-Sale, Due one through five years, Amortized cost1,300 
Securities Available-for-Sale, Due one through five years, Fair value1,397 
Securities Available-for-Sale, Total, Amortized cost3,615 
Securities Available-for-Sale, at Fair value3,72411,044
Securities Held-to-Maturity, Due within one year, Amortized cost1,992 
Securities Held-to-Maturity, Due within one year, Fair value1,999 
Securities Held-to-Maturity, Total, Amortized cost1,992 
Securities Held-to-Maturity, Total, Fair value1,999 
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
  
Schedule of Investments [Line Items]  
Securities Available-for-Sale, Total, Amortized cost544,648 
Securities Available-for-Sale, at Fair value566,7481,011,412
Securities Held-to-Maturity, Total, Amortized cost841,584 
Securities Held-to-Maturity, Total, Fair value$ 859,370