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Securities Available-For-Sale (Summary Of Expected Maturity Distribution Of Debt Securities Available-For-Sale, Other Than Mortgage-Backed Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Estimated fair value $ 937,085 $ 1,275,631
Other Than Mortgage Backed Securities [Member]
   
Amortized cost, Due in one year or less     
Amortized cost, Due after one year through five years 76,491  
Amortized cost 76,491  
Estimated fair value, Due in one year or less     
Estimated fair value, Amortized cost, Due after one year through five years 76,452  
Estimated fair value $ 76,452