Loans And Allowance For Loan Losses (Schedule Of Current, Accruing Past Due And Nonaccrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	$ 19,597,760		$ 18,913,905
Accruing 30-89 Days Past Due	68,111		98,014
Accruing 90 Days or Greater Past Due	4,489		6,811
Total Accruing Past Due	72,600		104,825
Nonaccrual	416,300		543,333
Total loans	20,086,660	[1]	19,562,063	[2]
Deferred fees and costs, net	28,862		20,373		12,000
Home Equity Lines [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,564,578		1,515,396
Accruing 30-89 Days Past Due	4,919		9,555
Accruing 90 Days or Greater Past Due	136		705
Total Accruing Past Due	5,055		10,260
Nonaccrual	17,908		16,741
Total loans	1,587,541		1,542,397
Consumer Mortgages [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,460,219		1,348,506
Accruing 30-89 Days Past Due	18,068		22,502
Accruing 90 Days or Greater Past Due	1,011		1,288
Total Accruing Past Due	19,079		23,790
Nonaccrual	39,770		39,265
Total loans	1,519,068		1,411,561
Credit Cards [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	253,422		258,698
Accruing 30-89 Days Past Due	1,917		2,450
Accruing 90 Days or Greater Past Due	1,507		2,413
Total Accruing Past Due	3,424		4,863
Nonaccrual	0		0
Total loans	256,846		263,561
Other Retail Loans [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	280,524		271,175
Accruing 30-89 Days Past Due	2,190		3,135
Accruing 90 Days or Greater Past Due	26		24
Total Accruing Past Due	2,216		3,159
Nonaccrual	2,038		2,895
Total loans	284,778		277,229
Investment Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	4,496,633		4,318,379
Accruing 30-89 Days Past Due	3,552		5,436
Accruing 90 Days or Greater Past Due	40		798
Total Accruing Past Due	3,592		6,234
Nonaccrual	66,454		91,868
Total loans	4,566,679		4,416,481
1-4 Family Properties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	1,122,640		1,200,370
Accruing 30-89 Days Past Due	6,267		13,053
Accruing 90 Days or Greater Past Due	527		41
Total Accruing Past Due	6,794		13,094
Nonaccrual	33,819		72,578
Total loans	1,163,253		1,286,042
Land Acquisition [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	552,325		600,146
Accruing 30-89 Days Past Due	1,100		3,422
Accruing 90 Days or Greater Past Due	300		298
Total Accruing Past Due	1,400		3,720
Nonaccrual	154,095		191,475
Total loans	707,820		795,341
Commercial Real Estate [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	6,171,598		6,118,895
Accruing 30-89 Days Past Due	10,919		21,911
Accruing 90 Days or Greater Past Due	867		1,137
Total Accruing Past Due	11,786		23,048
Nonaccrual	254,368		355,921
Total loans	6,437,752		6,497,864
Commercial, Financial and Agricultural [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	5,422,139		5,194,916
Accruing 30-89 Days Past Due	16,251		15,742
Accruing 90 Days or Greater Past Due	721		845
Total Accruing Past Due	16,972		16,587
Nonaccrual	59,628		79,575
Total loans	5,498,739		5,291,078
Owner-Occupied [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	3,768,333		3,700,793
Accruing 30-89 Days Past Due	9,341		17,784
Accruing 90 Days or Greater Past Due	66		61
Total Accruing Past Due	9,407		17,845
Nonaccrual	36,980		43,386
Total loans	3,814,720		3,762,024
Small Business [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	676,947		505,526
Accruing 30-89 Days Past Due	4,506		4,935
Accruing 90 Days or Greater Past Due	155		338
Total Accruing Past Due	4,661		5,273
Nonaccrual	5,608		5,550
Total loans	687,216		516,349
Commercial And Industrial [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	9,867,419		9,401,235
Accruing 30-89 Days Past Due	30,098		38,461
Accruing 90 Days or Greater Past Due	942		1,244
Total Accruing Past Due	31,040		39,705
Nonaccrual	102,216		128,511
Total loans	10,000,675		9,569,451
Retail [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Current	3,558,743		3,393,775
Accruing 30-89 Days Past Due	27,094		37,642
Accruing 90 Days or Greater Past Due	2,680		4,430
Total Accruing Past Due	29,774		42,072
Nonaccrual	59,716		58,901
Total loans	$ 3,648,233		$ 3,494,748

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

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