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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale Securities, Less than 12 Months, Fair Value $ 489,991 $ 1,298,593
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 3,173 21,334
Available-for-sale Securities, 12 Months or Longer, Fair Value 52,441 2,652
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 808 31
Available-for-sale Securities, Fair Value 542,432 1,301,245
Available-for-sale Securities, Unrealized Losses 3,981 21,365
Held-to-maturity Securities, 12 Months or Longer, Fair Value 602 658
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 77 209
Held-to-maturity Securities, Fair Value 602 658
Held-to-maturity Securities, Unrealized Losses 77 209
U.S. Treasury And Agencies [Member]
   
Available-for-sale Securities, 12 Months or Longer, Fair Value 85 110
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1 1
Available-for-sale Securities, Fair Value 85 110
Available-for-sale Securities, Unrealized Losses 1 1
Obligations Of States And Political Subdivisions [Member]
   
Available-for-sale Securities, Less than 12 Months, Fair Value 516 60,110
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 13 1,366
Available-for-sale Securities, 12 Months or Longer, Fair Value   1,003
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses   22
Available-for-sale Securities, Fair Value 516 61,113
Available-for-sale Securities, Unrealized Losses 13 1,388
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Available-for-sale Securities, Less than 12 Months, Fair Value 489,475 1,238,483
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 3,160 19,968
Available-for-sale Securities, 12 Months or Longer, Fair Value 52,222 1,539
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 790 8
Available-for-sale Securities, Fair Value 541,697 1,240,022
Available-for-sale Securities, Unrealized Losses 3,950 19,976
Held-to-maturity Securities, 12 Months or Longer, Fair Value 602 658
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 77 209
Held-to-maturity Securities, Fair Value 602 658
Held-to-maturity Securities, Unrealized Losses 77 209
Other Debt Securities [Member]
   
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