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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 709,500 $ 780,234
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 20,181 5,548
Available-for-sale Securities, 12 Months or Longer, Fair Value 261,017 106,155
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 2,537 1,077
Available-for-sale Securities, Fair Value 970,517 886,389
Available-for-sale Securities, Unrealized Losses 22,718 6,625
Held-to-maturity Securities, Less than 12 Months, Fair Value 280 0
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 26 0
Held-to-maturity Securities, 12 Months or Longer, Fair Value 51 48
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 3 7
Held-to-maturity Securities, Fair Value 331 48
Held-to-maturity Securities, Unrealized Losses 29 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 45 59
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1 1
Available-for-sale Securities, Fair Value 45 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 61,350  
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 3,439  
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 61,350  
Available-for-sale Securities, Unrealized Losses 3,439  
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 648,150 780,234
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 16,742 5,548
Available-for-sale Securities, 12 Months or Longer, Fair Value 260,972 106,096
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 2,536 1,076
Available-for-sale Securities, Fair Value 909,122 886,330
Available-for-sale Securities, Unrealized Losses 19,278 6,624
Held-to-maturity Securities, Less than 12 Months, Fair Value 280 0
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 26 0
Held-to-maturity Securities, 12 Months or Longer, Fair Value 51 48
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 3 7
Held-to-maturity Securities, Fair Value 331 48
Held-to-maturity Securities, Unrealized Losses $ 29 $ 7