Investment Securities (Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment Holdings [Line Items]
Gains	$ 21	$ 1,827	$ 1,883	$ 8,308
Losses		14	684	817
U.S. Treasury And Agencies [Member]
Investment Holdings [Line Items]
Gains			371
Obligations Of States And Political Subdivisions [Member]
Investment Holdings [Line Items]
Gains	8		10	7
Losses			1
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Investment Holdings [Line Items]
Gains		1,827	1,484	8,301
Losses		14	683	817
Other Debt Securities [Member]
Investment Holdings [Line Items]
Gains	$ 13		$ 18