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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value $ 256,769 $ 524,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 1,229 18,526
Available-for-sale Securities, 12 Months or Longer, Fair Value 582,666 249,727
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 14,472 12,869
Available-for-sale Securities, Fair Value 839,435 774,051
Available-for-sale Securities, Unrealized Losses 15,701 31,395
Held-to-maturity Securities, Less than 12 Months, Fair Value 210 156
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 42 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 210 156
Held-to-maturity Securities, Unrealized Losses 42 19
U.S. Treasury And Agencies [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value   0
Available-for-sale Securities, Less than 12 Months, Unrealized Losses   0
Available-for-sale Securities, 12 Months or Longer, Fair Value   32
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses   1
Available-for-sale Securities, Fair Value   32
Available-for-sale Securities, Unrealized Losses   1
Obligations Of States And Political Subdivisions [Member]
   
Investment Holdings [Line Items]    
Available-for-sale Securities, Less than 12 Months, Fair Value 7,145 48,342
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 647 2,575
Available-for-sale Securities, 12 Months or Longer, Fair Value 24,892 0
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 409 0
Available-for-sale Securities, Fair Value 32,037 48,342
Available-for-sale Securities, Unrealized Losses 1,056 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 249,624 475,982
Available-for-sale Securities, Less than 12 Months, Unrealized Losses 582 15,951
Available-for-sale Securities, 12 Months or Longer, Fair Value 557,774 249,695
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses 14,063 12,868
Available-for-sale Securities, Fair Value 807,398 725,677
Available-for-sale Securities, Unrealized Losses 14,645 28,819
Held-to-maturity Securities, Less than 12 Months, Fair Value 210 156
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses 42 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 210 156
Held-to-maturity Securities, Unrealized Losses $ 42 $ 19