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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 488,735 $ 780,234
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 15,794 5,548
Available-for-sale Securities, 12 Months or Longer, Fair Value 264,968 106,155
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 6,220 1,077
Available-for-sale Securities, Fair Value 753,703 886,389
Available-for-sale Securities, Unrealized Losses 22,014 6,625
Held-to-maturity Securities, Less than 12 Months, Fair Value 0 0
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 0 0
Held-to-maturity Securities, 12 Months or Longer, Fair Value 46 48
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 1 7
Held-to-maturity Securities, Fair Value 46 48
Held-to-maturity Securities, Unrealized Losses 1 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 0 59
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 0 1
Available-for-sale Securities, Fair Value 0 59
Available-for-sale Securities, Unrealized Losses 0 1
Obligations Of States And Political Subdivisions [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 47,814  
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 2,114  
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 47,814  
Available-for-sale Securities, Unrealized Losses 2,114  
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 440,921 780,234
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 13,680 5,548
Available-for-sale Securities, 12 Months or Longer, Fair Value 264,968 106,096
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 6,220 1,076
Available-for-sale Securities, Fair Value 705,889 886,330
Available-for-sale Securities, Unrealized Losses 19,900 6,624
Held-to-maturity Securities, Less than 12 Months, Fair Value 0 0
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 0 0
Held-to-maturity Securities, 12 Months or Longer, Fair Value 46 48
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 1 7
Held-to-maturity Securities, Fair Value 46 48
Held-to-maturity Securities, Unrealized Losses $ 1 $ 7