Commitments And Contingencies (Outstanding Commitments) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Commitments And Contingencies [Line Items]
Outstanding commitments	$ 1,666,311	$ 1,483,109
Commitments To Extend Credit [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	1,533,878	1,360,266
Standby Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	58,597	59,876
Other Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	73,705	62,722
Bill Of Lading Guarantees [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	$ 131	$ 245