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Securities (Summary of Expected Maturity Distribution of Debt Securities Available-for-Sale, Other than Mortgage-Backed Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Estimated fair value $ 1,023,055 $ 1,275,631
Other Than Mortgage Backed Securities [Member]
   
Amortized cost, Due after one year through five years 110,944  
Amortized cost 110,944  
Fair value, Amortized cost, Due after one year through five years 110,639  
Estimated fair value $ 110,639