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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 780,234 $ 489,991
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 5,548 3,173
Available-for-sale Securities, 12 Months or Longer, Fair Value 106,155 52,441
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1,077 808
Available-for-sale Securities, Fair Value 886,389 542,432
Available-for-sale Securities, Unrealized Losses 6,625 3,981
Held-to-maturity Securities, 12 Months or Longer, Fair Value 48 602
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 7 77
Held-to-maturity Securities, Fair Value 48 602
Held-to-maturity Securities, Unrealized Losses 7 77
U.S. Treasury And Agencies [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, 12 Months or Longer, Fair Value 59 85
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1 1
Available-for-sale Securities, Fair Value 59 85
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   516
Available-for-sale Securities, Less than 12 Months, Unrealized Losses   13
Available-for-sale Securities, Fair Value   516
Available-for-sale Securities, Unrealized Losses   13
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 780,234 489,475
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 5,548 3,160
Available-for-sale Securities, 12 Months or Longer, Fair Value 106,096 52,222
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1,076 790
Available-for-sale Securities, Fair Value 886,330 541,697
Available-for-sale Securities, Unrealized Losses 6,624 3,950
Held-to-maturity Securities, 12 Months or Longer, Fair Value 48 602
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 7 77
Held-to-maturity Securities, Fair Value 48 602
Held-to-maturity Securities, Unrealized Losses 7 77
Other Debt Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, 12 Months or Longer, Fair Value   134
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses   17
Available-for-sale Securities, Fair Value   134
Available-for-sale Securities, Unrealized Losses   $ 17