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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 451,611 $ 524,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 10,718 18,526
Available-for-sale Securities, 12 Months or Longer, Fair Value 286,138 249,727
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 12,394 12,869
Available-for-sale Securities, Fair Value 737,749 774,051
Available-for-sale Securities, Unrealized Losses 23,112 31,395
Held-to-maturity Securities, Less than 12 Months, Fair Value 169 156
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 8 19
Held-to-maturity Securities, 12 Months or Longer, Fair Value 0 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 0 0
Held-to-maturity Securities, Fair Value 169 156
Held-to-maturity Securities, Unrealized Losses 8 19
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 25 32
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 1 1
Available-for-sale Securities, Fair Value 25 32
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 38,975 48,342
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 1,165 2,575
Available-for-sale Securities, 12 Months or Longer, Fair Value 1,767 0
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 132 0
Available-for-sale Securities, Fair Value 40,742 48,342
Available-for-sale Securities, Unrealized Losses 1,297 2,575
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 412,636 475,982
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 9,553 15,951
Available-for-sale Securities, 12 Months or Longer, Fair Value 284,346 249,695
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 12,261 12,868
Available-for-sale Securities, Fair Value 696,982 725,677
Available-for-sale Securities, Unrealized Losses 21,814 28,819
Held-to-maturity Securities, Less than 12 Months, Fair Value 169 156
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 8 19
Held-to-maturity Securities, 12 Months or Longer, Fair Value 0 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 0 0
Held-to-maturity Securities, Fair Value 169 156
Held-to-maturity Securities, Unrealized Losses $ 8 $ 19