Commitments And Contingencies (Financial Instruments, Credit Risk) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Line Items]
Outstanding commitments	$ 1,753,019	$ 1,483,109
Commercial Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	64,233	62,722
Bill Of Lading Guarantees [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	187	245
Commitments To Extend Credit [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	1,626,523	1,360,266
Standby Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Outstanding commitments	$ 62,076	$ 59,876