Investment Securities (Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment Holdings [Line Items]
Gains	$ 4,977	$ 8,552	$ 2,334
Losses	954	817	8
U.S. Treasury And Agencies [Member]
Investment Holdings [Line Items]
Gains	371
Losses			1
Obligations Of States And Political Subdivisions [Member]
Investment Holdings [Line Items]
Gains	10	8	3
Losses	1		7
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Investment Holdings [Line Items]
Gains	4,578	8,544	2,331
Losses	953	817
Other Debt Securities [Member]
Investment Holdings [Line Items]
Gains	$ 18