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Available-For-Sale Securities (Summary Of Available-For-Sale Debt Securities In A Continuous Unrealized Loss Position Deemed Not To Be Other-Than-Temporarily Impaired) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses$ (36,085)$ (4,591)
Less than 12 months, Estimated Fair Value1,112,1431,463,107
12 months or greater, Gross Unrealized Losses(6,013)(5,129)
12 months or greater, Estimated Fair Value126,55570,771
Total, Gross Unrealized Losses(42,098)(9,720)
Total, Estimated Fair Value1,238,6981,533,878
U.S. Treasury Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses(322)(1,020)
Less than 12 months, Estimated Fair Value249,055531,184
12 months or greater, Gross Unrealized Losses00
12 months or greater, Estimated Fair Value00
Total, Gross Unrealized Losses(322)(1,020)
Total, Estimated Fair Value249,055531,184
U.S. Government Agencies And FDIC Guaranteed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses(236)(463)
Less than 12 months, Estimated Fair Value179,879226,176
12 months or greater, Gross Unrealized Losses00
12 months or greater, Estimated Fair Value00
Total, Gross Unrealized Losses(236)(463)
Total, Estimated Fair Value179,879226,176
Municipal Debt Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses(2)(21)
Less than 12 months, Estimated Fair Value9,7854,688
12 months or greater, Gross Unrealized Losses00
12 months or greater, Estimated Fair Value00
Total, Gross Unrealized Losses(2)(21)
Total, Estimated Fair Value9,7854,688
Non-U.S. Government Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses(30,604)(86)
Less than 12 months, Estimated Fair Value25,31444,317
12 months or greater, Gross Unrealized Losses(2)0
12 months or greater, Estimated Fair Value2,9950
Total, Gross Unrealized Losses(30,606)(86)
Total, Estimated Fair Value28,30944,317
Corporate Debt Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses(4,182)(1,762)
Less than 12 months, Estimated Fair Value548,008459,412
12 months or greater, Gross Unrealized Losses(49)0
12 months or greater, Estimated Fair Value6,2980
Total, Gross Unrealized Losses(4,231)(1,762)
Total, Estimated Fair Value554,306459,412
Residential Mortgage And Asset-Backed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses(739)(1,239)
Less than 12 months, Estimated Fair Value100,102197,330
12 months or greater, Gross Unrealized Losses(1,169)0
12 months or greater, Estimated Fair Value60,7550
Total, Gross Unrealized Losses(1,908)(1,239)
Total, Estimated Fair Value160,857197,330
Student Loan-Backed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 12 months, Gross Unrealized Losses00
Less than 12 months, Estimated Fair Value00
12 months or greater, Gross Unrealized Losses(4,793)(5,129)
12 months or greater, Estimated Fair Value56,50770,771
Total, Gross Unrealized Losses(4,793)(5,129)
Total, Estimated Fair Value$ 56,507$ 70,771