Commitments And Contingencies (Outstanding Financial Instruments Contract Amounts Represent Credit Risk) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Line Items]
Total financial instruments with off-balance sheet risk	$ 3,871,834	$ 3,848,260
Stand By Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Total financial instruments with off-balance sheet risk	159,930	166,744
Commercial Letters Of Credit [Member]
Commitments And Contingencies [Line Items]
Total financial instruments with off-balance sheet risk	3,087	11,555
Commitments To Extend Credit [Member]
Commitments And Contingencies [Line Items]
Total financial instruments with off-balance sheet risk	318,001	339,249
Unfunded Commitments Under Existing Lines And Loans [Member]
Commitments And Contingencies [Line Items]
Total financial instruments with off-balance sheet risk	$ 3,390,816	$ 3,330,712