Securities (Continuous Unrealized-Loss Position Of Available-For-Sale And Held-To-Maturity Securities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Fair Value	$ 30,054	$ 275,028
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	455	7,545
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Fair Value		2,070
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss		196
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Fair Value	30,054	277,098
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Unrealized Loss	455	7,741
Obligations Of States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Fair Value	5,081	164,437
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	219	5,665
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Fair Value		2,070
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss		196
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Fair Value	5,081	166,507
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Unrealized Loss	219	5,861
Corporate Bonds And Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Fair Value	18,506
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	168
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Fair Value
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Fair Value	18,506
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Unrealized Loss	168
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Fair Value	6,467	110,591
Available-for-sale and held-to-maturity securities, continuous unrealized loss position Less than 12 Months, Unrealized Loss	68	1,880
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Fair Value
Available-for-sale and held-to-maturity securities, continuous unrealized loss position 12 Months or Longer, Unrealized Loss
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Fair Value	6,467	110,591
Available-for-sale and held-to-maturity securities, continuous unrealized loss position, Unrealized Loss	$ 68	$ 1,880