Loans And Allowance For Loan Losses (Loans Outstanding By Classification) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	$ 6,449,452	$ 7,270,618
Commercial and industrial	9,101,514	8,941,274
Total retail	4,011,097	3,879,907
Total loans	19,562,063	20,091,799
Deferred fees and costs, net	(20,373)	(11,986)
Total loans, net of deferred fees and costs	19,541,690	20,079,813
Home Equity Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	1,542,397	1,619,585
Total loans	1,542,397	1,619,585
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	1,394,248	1,411,749
Total loans	1,394,248	1,411,749
Credit Cards [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	263,561	273,098
Total loans	263,561	273,098
Small Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	516,349	300,332
Total loans	516,349	300,332
Other Retail Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	294,542	275,143
Total loans	294,542	275,143
Investment Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	4,376,118	4,557,313
Total loans	4,376,118	4,557,313
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	1,279,105	1,618,484
Total loans	1,279,105	1,618,484
Land Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	794,229	1,094,821
Total loans	$ 794,229	$ 1,094,821