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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 664,042 $ 489,991
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 4,603 3,173
Available-for-sale Securities, 12 Months or Longer, Fair Value 46,886 52,441
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 690 808
Available-for-sale Securities, Fair Value 710,928 542,432
Available-for-sale Securities, Unrealized Losses 5,293 3,981
Held-to-maturity Securities, 12 Months or Longer, Fair Value 1,531 602
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 68 77
Held-to-maturity Securities, Fair Value 1,531 602
Held-to-maturity Securities, Unrealized Losses 68 77
U.S. Treasury And Agencies [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, 12 Months or Longer, Fair Value 72 85
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1 1
Available-for-sale Securities, Fair Value 72 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 13,225 516
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 239 13
Available-for-sale Securities, Fair Value 13,225 516
Available-for-sale Securities, Unrealized Losses 239 13
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 650,817 489,475
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 4,364 3,160
Available-for-sale Securities, 12 Months or Longer, Fair Value 46,670 52,222
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 684 790
Available-for-sale Securities, Fair Value 697,487 541,697
Available-for-sale Securities, Unrealized Losses 5,048 3,950
Held-to-maturity Securities, 12 Months or Longer, Fair Value 1,531 602
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 68 77
Held-to-maturity Securities, Fair Value 1,531 602
Held-to-maturity Securities, Unrealized Losses 68 77
Other Debt Securities [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, 12 Months or Longer, Fair Value 144 134
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 5 17
Available-for-sale Securities, Fair Value 144 134
Available-for-sale Securities, Unrealized Losses $ 5 $ 17