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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 614,999 $ 780,234
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 4,416 5,548
Available-for-sale Securities, 12 Months or Longer, Fair Value 222,806 106,155
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1,430 1,077
Available-for-sale Securities, Fair Value 837,805 886,389
Available-for-sale Securities, Unrealized Losses 5,846 6,625
Held-to-maturity Securities, Less than 12 Months, Fair Value 118 0
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 12 0
Held-to-maturity Securities, 12 Months or Longer, Fair Value 50 48
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 4 7
Held-to-maturity Securities, Fair Value 168 48
Held-to-maturity Securities, Unrealized Losses 16 7
U.S. Treasury And Agencies [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 0 0
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 0 0
Available-for-sale Securities, 12 Months or Longer, Fair Value 52 59
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1 1
Available-for-sale Securities, Fair Value 52 59
Available-for-sale Securities, Unrealized Losses 1 1
Obligations Of States And Political Subdivisions [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 10,363  
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 218  
Available-for-sale Securities, 12 Months or Longer, Fair Value 0  
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 0  
Available-for-sale Securities, Fair Value 10,363  
Available-for-sale Securities, Unrealized Losses 218  
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 604,636 780,234
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 4,198 5,548
Available-for-sale Securities, 12 Months or Longer, Fair Value 222,754 106,096
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1,429 1,076
Available-for-sale Securities, Fair Value 827,390 886,330
Available-for-sale Securities, Unrealized Losses 5,627 6,624
Held-to-maturity Securities, Less than 12 Months, Fair Value 118 0
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 12 0
Held-to-maturity Securities, 12 Months or Longer, Fair Value 50 48
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 4 7
Held-to-maturity Securities, Fair Value 168 48
Held-to-maturity Securities, Unrealized Losses $ 16 $ 7