Loans And Allowance For Loan Losses (Loans Outstanding By Classification) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	$ 6,437,752		$ 6,497,864
Commercial and industrial	10,000,675		9,569,451
Total retail	3,648,233		3,494,748
Total loans	20,086,660	[1]	19,562,063	[2]
Deferred fees and costs, net	(28,862)		(20,373)		(12,000)
Total loans, net of deferred fees and costs	20,057,798		19,541,690
Home Equity Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	1,587,541		1,542,397
Total loans	1,587,541		1,542,397
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	1,519,068		1,411,561
Total loans	1,519,068		1,411,561
Credit Cards [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	256,846		263,561
Total loans	256,846		263,561
Other Retail Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total retail	284,778		277,229
Total loans	284,778		277,229
Investment Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	4,566,679		4,416,481
Total loans	4,566,679		4,416,481
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	1,163,253		1,286,042
Total loans	1,163,253		1,286,042
Land Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total commercial real estate loans	707,820		795,341
Total loans	707,820		795,341
Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial and industrial	5,498,739		5,291,078
Total loans	5,498,739		5,291,078
Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial and industrial	3,814,720		3,762,024
Total loans	3,814,720		3,762,024
Small Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Commercial and industrial	687,216		516,349
Total loans	$ 687,216		$ 516,349

[1] Total before net deferred fees and costs of $28.9 million.

[2] Total before net deferred fees and costs of $20.4 million.