Investment Securities (Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities Table) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Investment Holdings [Line Items]
Gains	$ 378	$ 2
Losses	230	1
U.S. Treasury And Agencies [Member]
Investment Holdings [Line Items]
Gains	371
Losses
Obligations Of States And Political Subdivisions [Member]
Investment Holdings [Line Items]
Gains	2	2
Losses		1
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Investment Holdings [Line Items]
Gains
Losses	230
Other Debt Securities [Member]
Investment Holdings [Line Items]
Gains	5
Losses